|Analysis of the difference between brown corundum and other abrasives|
|Release time: 2014-8-26|
Natural brown corundum, also known as garnet sand, is a silicate mineral. Grinding materials made by hydraulic sorting, machining, screening and classification. There is a long history of production and use. In ancient China, there were historical examples of using emery to grind crystal glass and various jade. In the 1840s, it was exported to Toyo. It is divided into three categories: coarse, medium and detailed. The coarse mesh is black-red, the middle mesh is light red, and the fine mesh is red and white. The size of each mesh is uniform, the particle shape is uniform, and the edges are called angular crystals. They have sharp edges and high grinding force. For stone industrial grinding marble and other soft materials. Glass industry grinding glass burrs, television picture tubes, optical instruments, lenses, prisms, glass for watches, etc. Metal blasting, derusting and grinding. Printing industry grinding offset plate, and light industry processing plastic samples, leather, sandpaper and other uses.
The grinding power of natural brown corundum is slightly lower than that of electric furnace white corundum, but it is strong-willed and has the characteristics of a shell-shaped section mouth. Its advantages are high smoothness of the grinding parts, few and shallow sand marks. The grinding surface is fine and uniform, which can improve the quality of the product, which is unique to diamond. The natural diamond abrasive has short grinding time, high efficiency and low price, which can make up for the short life. Pure natural brown alumina is suitable for sand blasting, rust removal, polishing and other purposes.
Characteristics of brown corundum: Due to the performance advantages of minerals, such as high hardness, good toughness, high specific gravity, and no harmful substances, brown corundum is a natural environmentally friendly grinding raw material, which plays an important role in the international spraying and cleaning industry character of.
Used as a blasting medium, it accounts for 45% of all industrial use. It can be seen that brown corundum is becoming more and more recognized in the blast cleaning industry.
Brown corundum, which is usually used as a blasting medium, is required to be composed of iron-aluminum garnet, because iron-aluminum garnet contains different main end-member molecules, which meets the industry's requirements for hardness. Among the various abrasives, the advantages of brown corundum are as follows:
First, less dust
Brown corundum is used for surface blasting. Because of its high specific gravity, less dust is generated during the blasting process. This ensures the health and safety of the operator and improves the visibility of the operator. Compared with slag (cold water or even seawater is used for high temperature cooling during the slag formation process, so the glass phase structure is formed, which is fragile). Because the slag is relatively brittle, it is easy to be crushed and crushed during the blasting process. Particles. Because the specific gravity of the slag is relatively small, small slag particles are suspended in the air, causing environmental pollution. Similarly, quartz sand is a very fragile abrasive.
Second, high efficiency
Brown corundum, under a certain pressure, can quickly and sharply hit the surface of the object with sharp edges and corners, so it is regarded as a very fast spray grinding method. The acceleration and velocity of particles in the air stream are a function of inertia and particle size. The smaller the particle, the easier it is to accelerate, so it can produce a higher impact on the surface of the object, resulting in a very high cleaning speed-under normal circumstances, this speed (m2 / hr) is twice faster than other conventional abrasives.
Third, low loss
The unique particle size of brown corundum ensures that more effective particles hit the surface of the object (such as 30-60 mesh sand, which can produce 11 million particles per kilogram of impact on the surface of the object, while conventional slag such as 20 mesh can only produce 1 million particles (Hit the surface of the object), so the use of garnet can greatly reduce the loss of abrasive-usually can save 1/3 of conventional abrasives.
4. High-quality surface treatment During the blasting process, brown corundum can penetrate into the surface caves and pits and reach the bare surface of the metal, so it can completely remove all rust, water-soluble salts and other pollutants . The treated metal surface is very clean and free of inserts, and the quality can easily reach the SA3 level of SIS standard. A smooth surface profile with uniform 50–75 μm peaks per unit area can be easily reached. In contrast, the rough and sharp edges of slag (such as copper slag, nickel slag, etc.) can easily remain on the surface of the steel after blasting. There are about 500 grains per square meter, which causes the failure of the initial coating And the coating is not effective.
Five, environmental protection
Different from the conventional blasting material, brown corundum is a pure natural non-toxic mineral. It contains no free silicon harmful substances that cause silicosis, and does not contain toxic heavy metals or radioactive pollutants. During operation, due to the relatively large specific gravity of the product, dust is rarely generated, which effectively ensures the health of the operator. In addition, the low consumption and recyclable characteristics of the product can greatly reduce the amount of waste treatment and cost after the product is used.
Six, can be recycled
Brown corundum is very suitable for many fields. Under normal circumstances, it can be reused 5-10 times. If it has not lost its cutting ability after 10 times, the number of cycles can be more. After no cutting ability, brown corundum can also be recycled and applied to the construction industry as a cement additive.
At present, the international garnet price is at a medium price. Because the performance and other aspects are far higher than slag abrasives, and the price is far lower than high-value abrasives, garnet abrasives are extremely cost-effective.
Brown corundum is widely favored by the international spray grinding industry for its superior performance and affordable price. Currently it is mainly used in the following industries:-
1. Shipbuilding, ship repair industry, refinery, warehouse maintenance and equipment installation
2. Construction and maintenance of chemical plants, old nuclear and thermal power plants, drainage equipment and gas plants, desalination plants, industrial plants
3. Construction and maintenance of containers, box trucks, train containers, coaches
4.Aircraft industry, maintenance including non-ferrous metal surfaces and turbine blades
5. Sculptures such as glass, granite, marble, and building cleaning, construction industry, and steel structures
6. For high pressure water jet cleaning equipment
As mentioned above, brown corundum is an ideal and efficient environmentally friendly spray grinding material, which is worth trying by domestic enterprises. Currently widely used in sand blasting, rust removal, optics, electronics, building materials, machining, instruments, instruments, printing, grinding, stone, rubber, hydrojet and cutting industries. Especially in the past 10 years, brown corundum has been used as a pressure filter in water plants to replace quartz sand or gravel.