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Since alumina powder can be used as a raw material for brown aluminum oxide, alumina powder must be stronger than other materials, and its effect on white corundum is also very large. Therefore, we will start with the effect of alumina powder on white corundum. We all know that white corundum is white, and the white appearance of white corundum is formed by the role of alumina powder, because alumina powder is white, so as a raw material of white corundum, of course, it also brings white corundum. White appearance.
The current situation of the white corundum market can be estimated in the future. Many small businesses have white corundum dumpers with transformer power below 4200 kVA, and white corundum dump furnaces with transformer power below 3200 kVA. Reform, without transformation, will face investigation and punishment by the environmental protection department, and even stop production. Nowadays, many white corundum production enterprises in some areas have disabled white corundum dumpers with transformer power below 4200 kVA and transformer power below 3200.
The kilovolt-ampere white corundum dumping furnace has been transformed from a one-stop production and processing enterprise to a main processing enterprise, while a high-power white corundum production enterprise has become a professional production enterprise not doing processing, which has made the white corundum industry further. Centralization and scale. The smoke removal method of the brown fused aluminum oxide electric furnace mainly adopts a smoke exhaust hood method. That is, a large smoke exhaust hood is arranged above the furnace body, and the smoke exhaust hood is mainly composed of a furnace cover, a chimney, a furnace cover and the like. The upper cover of the furnace is a double-layer structure welded with 6-8mm steel plates.
The middle sandwich can pass cooling water and is provided with air vents to prevent the explosion accident caused by the superheated steam expansion. The side wall of the furnace cover is welded by steel plates and lined with refractory bricks. The key to the quality of brown corundum lies in the quality of the original mineral of white aluminium oxide. Generally, the good primary minerals are mainly small spherical particles, the size is very small, the impact resistance is large, and the surface looks bright and shiny. Therefore, when we buy brown corundum, we can preliminary judge the quality of the brown corundum we buy from the characteristics of shape, color, and size.
Brown corundum abrasive can be divided into three levels and five steps according to the level of alumina content. Primary brown corundum and secondary brown corundum are the most commonly used abrasive products in industry. The classification of brown corundum mainly includes: first-grade black corundum, second-grade brown corundum, second-grade brown corundum, second-grade brown corundum, and third-grade brown corundum, and the brown alumina content of each step is about 5% about. The appearance and application of different grades of brown corundum abrasives are also very different due to the differences in their chemical composition.
In the production, two shaping processes are combined with each other, and the shaped brown corundum powder is mixed in a certain proportion, which not only ensures the product's tap density, but also guarantees a high yield, and can obtain better economic benefits. The structure of the roller crusher determines that its crushing ratio cannot be very large. When crushing corundum, it is generally 3 to 4. A pairing machine for pink corundum crushing. The diameter of the stick should be 1-2 times larger than the length. In order to ensure the strength of the equipment And rigid.
The refractory is melted or melted only by high temperature heat load in use. When it reacts with molten slag to form a fusible substance, this fluxing effect, on the one hand, causes the crystalline phase structure of the refractory material to be destroyed, and the high temperature strength is severely damaged, aluminum oxide grit which accelerates the melting process; Migration causes the material to shrink, causing cracking of the material and the masonry, accelerating slag erosion and destroying the stability of the masonry.
There are grain size requirements for carbon materials. The particle size is too fine, the flying loss and the loss caused by combustion in the furnace mouth are relatively large. The particle size is too coarse, the diffusion area in the furnace is not enough, and the distribution is not uniform, silicon carbide abrasive which is unfavorable for smelting. On the other hand, the carbon particle size should match the bauxite block size, otherwise segregation will occur. There is a corresponding relationship between the size of carbon particle and the capacity of electric furnace. If the capacity of electric furnace is large, the size of carbon material can be a little larger.
Suspended pneumatic conveying relies on the kinetic energy of high-speed airflow. The advantages of pneumatic conveying are: small body size, flexible pipeline laying; high conveying efficiency, low labor intensity, less dust flying; simple equipment, easy to manufacture and install; simple operation, easy to realize control automation. Use other safety devices, green silicon carbide such as over load slice into hydraulic loading basin, etc. this can improve work efficiency, and even ear discharge, less powder
Ore bodies are usually bedded, with stable thickness and composition along the strike. The thickness can reach 25m, and the extension can reach several kilometers. The mineral composition of bauxite is simple, which is composed of diaspore or diaspore and contains iron minerals, aluminum oxide abrasive usually with oolitic structure and pisolitic structure. This type of deposit has a large scale, with reserves ranging from tens of millions to hundreds of millions of tons. Mediterranean countries and Germany, Yugoslavia, Hungary and other countries have such deposits.
When smelting in fixed furnace, operators should pay attention to carbon monoxide poisoning at any time. If they feel headache, dizziness, nausea and other mild symptoms, they should go to a place with fresh air and proper temperature for rest or seek medical treatment. In case of severe poisoning, emergency search shall be carried out: synthetic corundum remove the patient from the poisoning site immediately; place the patient in a place with fresh air and convective ventilation; keep quiet and keep warm; for the patient whose breath has stopped but the heart is still beating, artificial respiration shall be carried out; inform the relevant personnel of emergency treatment.
Large crushing ratio and wide feeding range. A self grinder can complete the coarse, medium and fine crushing operations at the same time. The autogenous grinding machine does not use grinding medium, which can reduce the chance of corundum products mixed with ferroalloy. The shape of black silicon carbide abrasive particles is good, and the equiaxed shape is more than 90%. The equipment is highly automated, easy to manage and high in production efficiency. There is a certain degree of over comminution phenomenon, so the yield of grain size commonly used in the processing of finished products is slightly low.
The gas permeability method is based on such a principle to test the particle size. This method can only get an average particle size value, and can't measure the particle size distribution. This method is mainly used in the magnetic material industry. Scraper method: scrape the samples of brown corundum and white corundum onto the surface of a flat plate, observe the roughness, so as to evaluate whether the sample size is qualified. This method is used in coating industry. A qualitative granularity test method.
When the iron content is sufficient, the silicon content in FeSi does not exceed the saturation concentration, and the reaction can proceed smoothly. In fact, the reduction of silica depends on the carbon dissolved in iron. The solubility of carbon in ferrosilicon melt decreases with the increase of emery abrasive in ferrosilicon alloy. That is to say, silicon can expel carbon from ferrosilicon melt, and the reduction of silicon dioxide will be difficult if the concentration of carbon in the melt decreases.