The solubility of carbon in the ferrosilicon melt decreases with the increase of the silicon content in the ferrosilicon alloy. Although it is slightly lower than the frit method, it shows better effect in use. The boundaries of the above zones are often not obvious and transitional to each other. Add it to the ingredients, the aluminum oxide abrasive powder sintering temperature of the product can be reduced, and the sintering time can be shortened.
The reduction of silica relies on carbon dissolved in iron. Another new development is the comprehensive use of suitable advanced mills and certain chemical preparation methods. The ratio of the mass of water contained in the abrasive to the mass of the brown corundum abrasive in the dry state is called the corundum moisture content. When the brown corundum is saturated with water, its moisture content is called the water absorption.
In addition to particle size testing, microscopic image methods are also commonly used to observe and test particle morphology. First put the sample into a metal tube and compact it, then install the metal tube into a gas circuit to form a closed loop gas circuit. When the gas flows in the gas path, the gas will pass through the gap between the particles. This method is a new technology that has been researched by people at home and abroad. It is said that there are already instruments in foreign countries, but not in China.
When the particle is small to a certain extent, the particle is affected by Brownian motion in the liquid, and assumes a random motion state. The motion distance and speed of the particle are related to the size of the particle. Sintering time and sintering temperature are a pair of interrelated parameters, so the setting of brown fused alumina sintering time is also very important. If the particle size is too fine, the flying loss and the loss caused by combustion at 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 uneven, which is unfavorable to smelting. The input of electric furnace is still widely used for manual operation. Manual operation is based on adjusting the electrode at the rated current. Due to the large crystal, good toughness and brittleness, the aluminium oxide sandblasting grit produced by this smelting method is more suitable for the manufacture of coated abrasive tools.
This is because the brown corundum produced by exile method has the characteristics of microcrystalline corundum in these aspects. The autogenous mill does not use grinding medium, which can reduce the chance of corundum products mixed with iron alloy. The processed abrasive particles have good shape, and the equiaxed shape is more than 90%. At present, the most widely used is fused cast zirconia corundum brick.
Parent rock decomposition zone (KAOLINIZATION zone), the parent rock is often decomposed into kaolin. Areas belonging to such deposits include the Deccan Plateau in India, Guyana in South America, Brazil, Arkansas in the United States, Zhangpu and Jinmen island in Fujian Province, China. The formation of bauxite is related to continental lacustrine facies deposition, and the quality of bauxite changes greatl. There are many kinds of fused cast refractory products.
