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Industrial silicon is obtained by reducing high-purity silica with a low-ash carbonaceous reducing agent in a coal-fired lining furnace. The industrial silicon ore furnace mainly has two furnace types, one is a single-phase furnace, and the other is a single-phase furnace. It is a three-phase furnace. The single-phase furnace is generally a fixed open furnace, the furnace shape is approximately elliptical, and the two electrodes are arranged in a straight line along the long axis of the ellipse. The three-phase furnace has a fixed open furnace and a furnace rotary open furnace.
Smelting industrial silicon, compared with smelting 75 ferrosilicon, maintains a higher reaction temperature than the furnace, compared to the carbon steel lining built inside the furnace is the largest bearing body to withstand high temperature and erosion. The charcoal lining is mostly made of self-baked carbon brick.
A: The formation mechanism of self-baking carbon brick
The self-baking carbon bricks produced by a certain process have a certain strength and shape. When the furnace is built, each self-baking charcoal brick is tightly joined together by an adhesive (usually with a jack as a tool) to form a whole. In the continuous production process after the oven, the self-baking carbon brick lining gradually strives for a number of physical and chemical processes:
- Exclude the moisture contained in the self-baked charcoal bricks at temperatures <200 °C.
——At low temperature, the low temperature volatiles in the self-baked carbon bricks volatilize at a temperature of 200-350 °C
——At high temperature, the high temperature volatiles in the self-baked carbon bricks volatilize at 350-600 °C
——At a temperature of 600-800 ° C, the binder is thermally cracked and coked, and the generated thermal cracking carbon diffuses to the inner surface of the self-baked carbon brick lining by capillary and void formed by moisture and volatiles discharge, and is filled therein The formed coking carbon network reduces the porosity and the strength of the self-baking carbon brick.
—— With the continuous development of the production process, the roasting and graphitization process of the self-baking carbon brick lining is gradually completed.
Self-baked carbon brick
Two: characteristics of self-baked carbon brick
1 simple manufacturing process
The self-baking carbon brick manufacturing process is raw material crushing, batch mixing, and compression molding. Compared with the manufacture of calcined carbon bricks, the roasting process is reduced and the manufacturing process is simplified. The roasting process of the self-baking carbon brick is gradually completed in the oven after the furnace and in the continuous production process.
2 furnace lining is strong
When the furnace lining is constructed by self-baking carbon brick, the binder used between the gaps is composed of coal tar and fine seam paste, and the composition thereof is substantially the same as that of the self-baking carbon brick. As with the roasting process of self-cultivating carbon bricks, the baking of the binder between the gaps is also carried out in an oven and in a continuous production process. Therefore, the lining of the self-baking carbon brick is solid, compact and strong, thereby overcoming the disadvantages of low strength and easy leakage of the lining joint of the roasted carbon brick.
3 easy to build furnace
Self-baking carbon bricks can be made into various specifications and shapes according to different requirements of users, thereby reducing the amount of carbon brick processing during lining masonry, and it is easy to build furnaces.
4 low cost
Compared with the calcined carbon bricks, the self-baked carbon bricks are about 40% cheaper, which is beneficial to the factory to reduce the cost.
Three: Precautions for using self-baked carbon bricks
Because self-baking carbon bricks and roasting carbon bricks have different characteristics, it is necessary to pay attention to the corresponding masonry process according to the inherent characteristics of self-baking carbon bricks. The difference between the brickwork and the roasting carbon bricks is that the gap of the self-cultivating carbon bricks is less than 1.5 mm, and the requirements for seamless masonry are required.
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