You may ask if dry or wet grinding is better for you. The answer depends on your goal and the material you use. Some industries, like pharmaceuticals and chemicals, pick dry grinding. They do this for better control and to save energy. In 2023, the dry grinding bead mill market was worth about $1.2 billion. This shows that many people want it. Wet grinders are also important. They are used a lot in food processing and construction. In 2024, the wet grinder market was worth $1.2 billion. As you read, think about your material’s hardness, moisture, safety, and cost.
Key Takeaways
Dry grinding is good for things that must stay dry or can be harmed by water. It is faster and costs less at first. But it makes more dust and heat.
Wet grinding uses liquid to cool and make things smooth. It makes less dust and helps tools last longer. It also makes the workspace safer. But it costs more to set up and you have to clean up the slurry.
Use dry grinding if you need fast results, do not have much water, or want to skip drying steps. Use wet grinding if you want tiny particles, smooth surfaces, and less dust.
Always stay safe. Wear protective gear when dry grinding to keep away dust. Be careful with slurry when wet grinding so you do not slip or hurt the environment.
Think about your material, money, safety, and how you want things to look before you choose. Try both ways or ask experts to help you get the best results.
Dry Grinding
Dry Grind Process
You use the dry grind process when you do not want water. This method is good for many industrial jobs. It works for grinding and polishing. First, you put the material into a mill. The mill can be a hammermill, pin mill, or ball mill. The mill makes the pieces smaller. It does this by hitting, pressing, rubbing, or cutting. Airflow helps dry the material. The air can be warm. The air also moves the material through the mill. You can change how small the pieces get. You do this by changing the rotor speed or gap size. You can also change the screen or classifier speed. Some mills can dry and grind at the same time. This saves time and energy.
Here is a table that lists common mill types and their main features:
Mill Type | Key Mechanism(s) and Steps |
|---|---|
Roller-race and ball-race mills | Compression, air-swept drying, classification, recirculation of coarse particles |
Hammer and impact mills | Impact, air-swept drying, classifier, reground rejects |
Fluid energy (jet) mills | High-speed gas jets, ultra-fine grinding, low capacity |
Tumbling ball mills | Impact and attrition, open circuit, high capacity |
Szego Mill™ | Compression, shearing, attrition, high-speed ring-roller, wet and dry grinding |
Pneumatic systems help control dust and heat in dry grinding. This keeps the area safe and clean.
Materials and Applications
You pick dry grinding for things that must stay dry. It is good for materials that do not mix with water. You use it for metals, plastics, ceramics, and sandpaper. Dry grinding is best for hard and rough materials. It is also good for things that are hurt by water. You use dry grinding for concrete floors. It helps make them shiny. You see this in hospitals, schools, and stores.
Dry grinding is used to make cement, tiles, and pigment powder. It is also used for ceramics that need to stay strong when hot. Examples are porcelain and silicon carbide. In aerospace, electronics, and medical work, dry grinding is needed for smooth finishes. Dry polishing makes things very shiny. This is a good thing about dry polishing. But dry polishing can make dust and heat.
Tip: Use dry grinding if you want to keep liquids away or need a fast, clean process.
Wet Grinding
Wet Grinding Process
Wet grinding means you mix water or another liquid with your material. This keeps things cool and stops dust from flying around. Water acts as a coolant and lubricant in this process. You put your material and water into a mill. The mill can be a ball mill or a bead mill. The liquid helps move the particles. It also keeps them from sticking together. Wet milling is good for materials that get damaged by heat. You can make the finish very smooth with this method. Wet grinding and polishing help control how small the particles are. You use wet milling when you want smooth surfaces or need to stop things from getting too hot.
Tip: Wet grinding and polishing lower dust and make your workspace safer. You also get a cleaner finish on concrete surfaces.
Materials and Applications
Wet grinding is best for materials that need a smooth finish. Wet milling works well for soft or heat-sensitive items. You often use it for pharmaceuticals, paints, and ceramics. Wet grinding and polishing are also good for food processing and nanotechnology. The liquid in wet milling helps wash away debris and mixes things better. This makes the process work faster and gives you better products.
Here is a table that compares ball mills and bead mills for wet grinding:
Feature | Ball Mills | Bead Mills |
|---|---|---|
Particle Size Range | Coarse to medium-fine (10 to 100 microns) | Ultra-fine (as small as 0.1 microns) |
Suitable Materials | Ores, ceramics, pigments | Paints, coatings, nanomaterials |
Advantages | Simple design, cost-effective, versatile | High energy efficiency, precise size control, minimal heat generation |
Limitations | Less efficient for ultra-fine grinding, heat generation | Higher initial cost, complex maintenance |
Typical Applications | Mining, ceramics, pharmaceuticals | Paints, coatings, food, nanotechnology |
You use wet grinding and polishing for concrete floors to make them shiny. Wet polishing gives a smooth, glossy surface. Wet milling helps stop cracks and chips in concrete. You see this method in hospitals, schools, and big stores. Wet grinding and polishing make concrete floors safer and look better. Wet milling is also used to make pigments and coatings. Wet polishing is best when you want a high-quality finish.
Process Comparison
Key Differences
There are some big differences between dry and wet grinding. The biggest one is the use of liquid. Wet grinding uses water or another liquid. The liquid keeps things cool and helps parts move smoothly. This lowers heat and makes tools last longer. Dry grinding does not use liquid. It uses air to cool things down. This can make things hotter and wear out tools faster.
Here is a table that shows the main differences between wet and dry grinding:
Aspect | Wet Grinding | Dry Grinding |
|---|---|---|
Cooling & Lubrication | Uses liquid coolant and lubricant to reduce heat and friction, enhancing tool life and efficiency. | Relies on air cooling without liquid, leading to higher temperatures and increased tool wear. |
Particle Size | Produces finer particles due to slurry formation and cooling. | Generally results in coarser particles and rougher surfaces. |
Dust Generation | Minimal dust as liquid captures particles, reducing airborne debris. | Generates significant dust requiring control measures like air filtration. |
Surface Finish | Achieves better surface finish with reduced surface damage due to cooling and lubrication. | May cause rougher surface finish due to heat and lack of lubrication. |
Equipment & Tooling | Tools designed for corrosion resistance and compatibility with liquids. | Tools built to withstand high temperatures and dust, often dust-resistant. |
Cost Considerations | Higher initial and operational costs due to cooling systems and fluid management. | Lower setup costs but higher expenses for wear and dust control. |
Environmental Impact | Requires disposal and treatment of used coolants to prevent contamination. | Needs dust control to protect air quality and reduce pollution. |
Wet milling is good at stopping dust and making surfaces smooth. Dry grinding costs less at first but needs more care for dust and heat.
Efficiency and Results
Wet grinding is often better when you look at how well it works. Wet milling uses liquid to keep things cool and smooth. This makes smaller and more even particles. You get smoother surfaces and better products. Wet grinding also makes less dust, so your workspace is safer.
Studies show wet grinding uses less energy. It gives better results, especially for minerals. Wet milling helps you get more from minerals and makes them easier to separate. You can use new ways to make wet milling work even better.
Dry grinding still has some good points. It wears down the grinding media less and keeps things cleaner. You might pick dry grinding if you do not have much water. But it can use more energy and give rougher results. Dry grinding can also make more dust and heat, which can change your final product.
Tip: Wet milling is best for fine particles and smooth surfaces. Dry grinding is good for fast jobs or places with little water.
Advantages and Disadvantages
Dry Grinding Pros and Cons
Dry grinding has good and bad sides. You pick dry grinding if you want to save water. It is also used for materials that must stay dry. Many industries like dry grinding because it helps them work better.
Pros of Dry Grinding:
You use less water. This saves money and helps the planet.
Machines like Vertical Roller Mills and High-Pressure Grinding Rolls use less energy for hard ores.
You get a sharp particle size. This helps recover minerals and makes flotation easier.
Dry grinding circuits can change quickly when ore hardness changes.
Vertical Roller Mills can grind so well that you do not need extra crushing steps.
You avoid galvanic corrosion, which can happen with wet grinding media.
Dry grinding makes dry or coarse tailings. These help keep things stable and save water.
You can start and stop dry grinding machines easily. This gives you more choices.
Note: Dry grinding is best when water is hard to get or when you need a dry feed for the next step.
Cons of Dry Grinding:
Tools wear out faster and the workpiece may not look as good because there is no cooling fluid.
Without cooling and chip removal, the grinding wheel can clog. The surface can get rough.
You get more dust and noise. This can make the area less safe and less comfortable.
Dry grinding does not work for every material or job. You see it mostly in special uses.
You must control moisture well. If not, you can get clumps that make grinding harder.
Grinding wheels with lots of holes can help, but too many holes make them weaker.
Here is a table that shows the main pros and cons of dry grinding:
Pros | Cons |
|---|---|
Saves water | |
Lower energy use for hard ores | Lower workpiece quality |
Better mineral recovery | More dust and noise |
Simple process flow | Wheel clogging and rough surfaces |
Flexible operation | Limited to special applications |
No galvanic corrosion | Needs careful moisture control |
Pick dry grinding if you want to save water, keep things simple, or need your material dry. Watch out for tool wear and dust. These can change your results.
Wet Grinding Pros and Cons
Wet grinding has its own good and bad sides. You use wet grinding when you want a smooth finish or need to keep dust down. Many people use wet grinding for concrete and other jobs that need a nice surface.
Pros of Wet Grinding:
You get a smoother surface and smaller particles. The liquid cools and helps the process.
Wet grinding and polishing make less dust. This keeps your workspace safer and cleaner.
Your tools do not get as hot, so they last longer.
Wet grinding works well for soft, heat-sensitive, or sticky materials.
You can make concrete and other surfaces shiny and glossy.
Wet grinding and polishing help stop cracks and chips. This makes things last longer.
Tip: Wet grinding is good for better surface quality and a safer work area, especially for concrete.
Cons of Wet Grinding:
You must handle and throw away used liquids. This can cost more and be harder.
Wet grinding machines cost more and need more care.
You may need to dry the material after grinding and polishing.
The process can be slower because you must clean up and deal with slurry.
Wet grinding costs more and needs extra steps to manage waste.
Here is a table that shows the pros and cons of wet grinding:
Pros | Cons |
|---|---|
Smoother finish and finer particles | Higher equipment and maintenance cost |
Less dust and safer workspace | Need to manage and dispose of liquids |
Longer tool life | Slower process due to cleanup |
Good for heat-sensitive materials | Extra drying steps may be needed |
Prevents cracks and chips in concrete | More complex operation |
Wet grinding and polishing give better results for concrete and other soft materials. You need to plan for extra costs and steps. The better finish and safety often make it worth it.
Concrete Grinding
Dry vs Wet Methods
People use concrete grinding to get floors ready in many places. You see it in homes, schools, and stores. There are two ways to grind concrete: dry or wet. Dry concrete grinding uses machines with no water. This way is fast. You can see your work right away. Workers use dry grinding to make floors shiny and bright. The floor stays dry, so you can add a coating right after.
Wet concrete grinding mixes water into the process. The water keeps dust from getting into the air. This makes it safer for people. Wet grinding is good for hospital floors and busy places. It gives a smooth finish, but you must wait for the floor to dry before adding a coating. You also need to clean up the wet mess called slurry.
Here are some real-life examples:
Dry concrete grinding is used in warehouses when you want the job done fast and want shiny floors.
Wet concrete grinding is used in schools to keep dust down and keep people safe.
Safety and Surface Finish
Safety is very important when grinding concrete. Dry concrete grinding makes a lot of dust. The dust has tiny bits of silicon that can hurt your lungs. You must wear a mask and use special machines to catch the dust. Wet concrete grinding uses water to trap the dust. This keeps the air cleaner and makes the area safer.
The way the floor looks also changes with each method. Dry concrete grinding makes the floor look brighter and shinier. You can check your work fast and put on a coating right away. Wet concrete grinding does not make the floor as shiny. You have to let the floor dry before you finish it.
The table below shows how dry and wet concrete grinding are different:
Aspect | Dry Grinding | Wet Grinding |
|---|---|---|
Surface Finish | More brilliant, high-gloss shine; quick assessment and immediate coating. | Lower gloss finish; requires drying time before coating. |
Safety Risks | High health risks from airborne dust; needs dust collection and respirators. | Dust-free environment; reduces airborne silica exposure. |
Tool Longevity | Risk of overheating and glazing. | Extends diamond tool life by keeping tools cool. |
Cleanup and Process | Faster, cleaner work; no slurry waste. | Slurry waste requires cleanup and disposal. |
Operational Costs | Higher due to dust control equipment. | Lower dust control costs; possible slurry disposal costs. |
Tip: Pick wet concrete grinding if you want less dust and a safer place to work. Choose dry concrete grinding if you want a faster job and a shinier floor.
Best Uses
When to Use Dry Grinding
You should use dry grinding when you work with materials that react badly to water or other liquids. This method works well for metals that can rust or change if they get wet. Dry grinding is also a good choice when you want to avoid extra steps like drying your material after grinding. Many people use dry grinding for concrete floors in places like warehouses or stores. You can see your progress right away and get high-gloss floors quickly. Dry grinding helps when you need to finish a job fast and want to keep the area clean. You may also choose dry grinding if you want to save water or if water is hard to get.
Note: Dry grinding is best for materials that can handle heat and do not need a liquid to stay safe. You also avoid problems with oxidation or chemical reactions.
Here are some common uses for dry grinding:
Preparing concrete floors for coatings in dry areas
Polishing floors in retail stores for a shiny look
Grinding metals that should not touch water
Making pigments or powders that must stay dry
When to Use Wet Grinding
Wet grinding works best when you need a smooth finish and want to keep dust down. You should use wet grinding for concrete floors in hospitals, schools, or places where people walk a lot. The water keeps the grinding area cool and safe. Wet grinding is also good for soft or heat-sensitive materials. You get fewer cracks and chips in concrete, which helps with durability. Wet grinding is a smart choice if you want to protect your health and get a clean, glossy surface.
Here are some real-world scenarios for wet grinding:
Polishing concrete floors in hospitals to lower dust and improve safety
Smoothing concrete in schools for a clean, safe finish
Grinding food products or pharmaceuticals that need a fine, even texture
Creating high-gloss floors in showrooms or public spaces
Use Case | Dry Grinding | Wet Grinding |
|---|---|---|
Concrete warehouse floors | Fast, shiny finish | Less common |
Hospital floors | Not recommended | Best for safety and dust |
Metal parts | Good for rust prevention | Not suitable |
Food processing | Not used | Best for smooth results |
High-gloss floors | Quick shine | Smooth, glossy finish |
Tip: Choose the grinding method that matches your material, your workspace, and the finish you want for your concrete floors.
Safety and Environment
Health Risks
You need to think about your health when you choose a grinding method. Dry grinding creates a lot of dust. This dust can float in the air and get into your lungs. Some dust contains toxic particles like silicon, which can cause serious breathing problems. You must use dust collectors with HEPA filters and wear protective gear, such as masks and goggles, to stay safe. Even with good dust extraction, you should always use personal protective equipment.
Wet grinding works differently. Water traps the dust and turns it into slurry. You do not breathe in harmful particles, so your lungs stay safer. You do not need dust collectors or respirators as much. However, wet floors can get slippery, so you must watch your step to avoid falls. You also need to clean up the slurry to keep the area safe.
Here is a quick look at the main health risks:
Grinding Method | Primary Health Risks and Safety Concerns |
|---|---|
Dry Grinding | Dust in the air can hurt your lungs. Toxic particles may cause health problems. You need dust extraction and protective gear. |
Wet Grinding | Water traps dust, so you do not breathe it in. Slippery floors and slurry waste need careful handling. |
Tip: Always use safety equipment and keep your workspace clean, no matter which method you choose.
Environmental Impact
You should also think about the environment when you pick a grinding method. Dry grinding does not use water, so you save this resource. Dust extraction systems help keep the air clean. You do not have to worry about water waste or slurry disposal. This makes dry grinding more environmentally friendly in many cases.
Wet grinding uses a lot of water. This can be a problem in places where water is scarce. The process creates slurry, which is a mix of water and ground material. You must clean up and dispose of slurry properly. If you do not, it can harm the environment. Sometimes, you can recycle slurry, but it takes extra work.
Here is a table that compares the environmental impact:
Environmental Factor | Wet Grinding | Dry Grinding |
|---|---|---|
Dust Control | Water traps dust, but creates slurry. | Dust extraction keeps air clean, no slurry. |
Water Consumption | Uses a lot of water. | No water used. |
Waste Management | Slurry needs cleanup and disposal. | Less waste, easier cleanup. |
Environmental Impact | Water waste and slurry disposal are concerns. | More eco-friendly with good dust control. |
Note: Choose the method that fits your local water supply and waste rules. Protect your health and the planet with smart grinding choices.
Cost Factors
Equipment and Operation
When you pick a grinding method, you should think about how much the machines and running them will cost. Dry grinding machines are usually cheaper to buy. They do not need pumps or water tanks. You can set up dry grinding machines fast, so you save money at first. Wet grinding machines cost more because you need pumps, water tanks, and tools that do not rust.
Here is a table that shows the main differences:
Aspect | Wet Grinding | Dry Grinding |
|---|---|---|
Equipment Cost | Higher initial setup costs due to specialized equipment and water management systems | Lower initial costs as no liquid handling systems are needed |
Maintenance | Higher maintenance costs due to water presence and corrosion risks | Regular maintenance needed for heat-related wear and tear |
Operational Expenses | Includes costs for coolant purchase, storage, disposal, and electricity for pumps | Potentially higher due to increased energy consumption from friction and heat, plus dust control and health safety measures |
Wet grinding means you have to buy coolant. You also need to store and throw away the used coolant. You pay more for electricity to run the pumps. Dry grinding can use more energy because it gets hot from friction. You need dust collectors to keep the air clean, which costs more. If you want to save money at the start, dry grinding is often cheaper. But you still need to plan for dust and tool wear.
Tip: Dry grinding costs less at first, but wet grinding can help you save energy later.
Long-Term Value
You should also think about how much you will spend over time. Wet grinding machines cost more, but they last longer because the liquid keeps them cool. Wet grinding wheels wear out faster because of the slurry, so you need to buy new ones more often. Dry grinding wheels last longer, but you must watch for damage from heat and friction.
Here is a table that compares long-term costs:
Aspect | Wet Grinding | Dry Grinding |
|---|---|---|
Equipment | Requires specialized high-pressure water systems and corrosion-resistant tools. | Simpler machinery; no liquid handling systems. |
Maintenance | Higher due to water exposure and corrosion risks. | Regular checks needed for heat-related wear and tear; less corrosion risk. |
Consumables | Grinding plates wear faster due to abrasive slurry. | Consumables wear from heat and friction but generally last longer. |
Initial Cost | Higher due to specialized equipment and water management systems. | Lower initial costs but potentially higher operational costs from energy use. |
Dry grinding machines need less care because water does not touch their parts. You still need to check for heat damage and keep dust collectors working. Wet grinding needs more care because water can cause rust and wear. You spend more on new grinding plates and cleaning up the slurry.
Dry grinding gives you simple machines and less chance of rust.
Wet grinding saves energy and keeps tools cooler, but you pay more for fixing and replacing parts.
Both ways need regular checks to keep grinding safe and working well.
Wet grinding can use up to 30% less power than dry grinding because the liquid lowers friction. You save money on energy, but you spend more on coolant and fixing machines. Dry grinding may cost less at first, but you need to plan for higher energy use and dust control as time goes on.
Note: Think about both short-term and long-term costs before you pick a grinding method. The best choice depends on your budget, your material, and how often you need to grind.
Choosing a Method
Key Considerations
When you pick between dry and wet grinding, you should think about a few things. Each way has good and bad sides. What you choose depends on your material, your money, your safety, and what you want in the end.
Here is a table that shows how these things matter:
Factor | Dry Grinding | Wet Grinding |
|---|---|---|
Material Properties | Best for moisture-sensitive, flammable, or reactive materials | Good for heat-sensitive materials and fine finishes |
Cost | Lower initial cost, but may need more for dust control and tool wear | Higher setup cost, but lower maintenance and longer tool life |
Safety | Dust and heat risks; needs good ventilation and protective gear | Slippery surfaces and slurry cleanup; less airborne dust |
Environmental Impact | No water waste; dust control needed | Water and slurry disposal required |
Desired Results | Fast process, coarser finish, simple operation | Fine particle size, smooth finish, better dispersion |
Think about your material first. Some things do not work well with water or heat. Dry grinding is good for metals that rust or powders that clump when wet. Wet grinding is better for soft things or when you want a shiny, smooth look.
Money matters too. Dry grinding machines cost less at the start. But you might spend more later on dust control and new tools. Wet grinding costs more to set up, but you save money on fixing machines and your tools last longer.
Safety is always important. Dry grinding makes dust that can hurt your lungs. You need masks and dust collectors. Wet grinding keeps dust down, but you have to clean up slippery slurry and be careful not to fall.
The environment is also important. Dry grinding does not use water, so you do not waste it. You need to control dust to keep the air clean. Wet grinding uses water and makes slurry, which you must throw away safely.
What you want in the end matters most. If you want a fast job and an easy process, dry grinding is a good pick. If you need a smooth finish and tiny particles, wet grinding works best.
Here is a table that matches materials and jobs to the best grinding way:
Application / Material Type | Preferred Grinding Method | Reason / Considerations |
|---|---|---|
Portland Cement | Wet or Dry (depending) | Cost and size characteristics prioritized; contamination less critical |
Cosmetics and Drugs | Usually Wet (ceramic mills) | Avoid contamination (iron) to prevent discoloration; use special grinding media |
Pyrotechnic Materials | Dry | Dry grinding yields superior product characteristics; may require inert atmosphere for reactivity |
Tungsten Carbide | Dry | Moisture harmful to subsequent processes; dry grinding preferred |
Metallic Powder Pigments | Dry | Minimizes discoloration |
Aluminium for Paint Preparation | Wet | Allows addition of antiflocculants like stearic acid |
Clays for Ceramic Slips | Wet | Initial wet condition and wet form required for next steps; drying uneconomical |
Paint Pigment Dispersion | Wet | Low solid concentration suspensions; ball wear considerations |
Tip: Always pick the grinding way that matches your material and your job. This helps you get good results and avoid problems.
Decision Checklist
You can use a simple list to help you choose the right grinding way. Follow these steps to make your choice easier:
Identify your material
Is your material sensitive to moisture or heat? Dry grinding is good for things that do not like water. Wet grinding is better for things that do not like heat.Set your goals for particle size and finish
Do you want a smooth finish or just smaller pieces? Wet grinding gives smaller, even particles. Dry grinding is faster but not as exact.Check your budget and equipment
Can you pay more to set up wet grinding? Do you have dust control for dry grinding? Wet grinding costs more at first but saves money later.Think about safety
Will you work in a place with good air flow? Dry grinding needs masks and dust collectors. Wet grinding needs shoes that do not slip and cleaning up slurry.Consider the environment
Is water easy to get and throw away? Wet grinding uses water and makes slurry. Dry grinding needs dust control but does not waste water.Review your application needs
Are you working inside or outside? Do you want a shiny finish or just a quick job? Wet grinding is best for shiny, smooth surfaces. Dry grinding is good for speed and easy use.Consult experts or test both methods
If you are not sure, ask someone who knows grinding or try both ways on a small piece. Experts can help you pick the right abrasive, speed, and pressure for your material.
Here is a quick list you can use:
Is your material sensitive to moisture or heat?
Do you want a smooth, fine finish?
Can you handle dust or slurry cleanup?
Is your workspace safe for dust or water?
Do you have the right machines for your chosen way?
Have you asked an expert or tried both ways?
Note: You can get better grinding results by picking the right abrasive and changing speed and pressure. Diamond wheels are good for hard things. Aluminum oxide wheels work for steel and alloys. Always wear safety gear and keep your workspace clean.
If you follow these steps, you can pick the grinding way that fits your needs. You will get better results, save money, and keep your workspace safe.
You should choose your grinding method based on your material, project goals, and budget. Wet grinding gives you a smoother finish, less dust, and longer tool life, but you must handle slurry and higher costs. Dry grinding works faster and costs less, but it creates more dust and heat. Always consider safety, environmental impact, and the finish you want. If you feel unsure, talk to a grinding specialist or run a small test. This helps you avoid mistakes and get the best results for your job.
FAQ
What is the main difference between dry and wet grinding?
You use dry grinding without any liquid. Wet grinding uses water or another liquid. The liquid in wet grinding cools the material and reduces dust. Dry grinding works faster but creates more dust and heat.
Can you switch between dry and wet grinding on the same machine?
You can switch if your machine supports both methods. Always clean the machine before changing methods. Some machines work best with one method. Check your equipment manual for safety and best results.
Which method is safer for your health?
Wet grinding is safer for your lungs. Water traps dust and keeps it out of the air. Dry grinding creates more dust, so you need masks and dust collectors to protect yourself.
Does wet grinding always give a better finish?
Wet grinding usually gives a smoother and shinier finish. The liquid helps prevent scratches and chips. Dry grinding can leave a rougher surface, but it works well for quick jobs or when you want a matte look.
What should you do with the waste from grinding?
Always collect and dispose of dust or slurry safely. Use a vacuum for dry dust. For wet slurry, let it dry and throw it away according to local rules. Never wash slurry down the drain.
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