Characteristics of coal-based recarburizer:

Coal-based recarburizer, also called calcined anthracite, is made from high-quality anthracite coal, so it has the characteristics of three highs and six lows inherent in anthracite itself, that is, three lows-low ash, low sulfur, and low phosphorus; six highs --High heat generation area, high specific resistance, high lump coal rate, high chemical reaction activity, high clean coal product recovery rate and high mechanical design strength, not only increase the relative content of fixed carbon during the calcination process, but also reduce the volatile content And some impurities without extra parts. Coal-based recarburizers are widely used in the smelting process of iron and steel products. They have the advantages of higher mechanical properties and better meeting the requirements of the production process. The calcining of anthracite in the cast iron industry can also prevent cast iron from overcooling and whitening. There are many advantages in the use process, which can effectively shorten the time for carbon increase, improve the effect of carbon increase, and also have the advantages of increasing the amount of scrap steel added, rationally using resources, and reducing production costs.

To Comparison of several processes of coal-based recarburizers:

1. Pot calciner process: refers to a kind of thermal equipment that intermittently heats the anthracite raw materials in the calcining furnace at high temperature to realize the entire calcining process. It has the characteristics of low indirect heating burning loss, no crushing of material particle size, thermal insulation and sealing, waste heat power generation, negative pressure and temperature can be automatically measured and recorded. It is a furnace type widely used in China's carbon industry;

2. Rotary kiln calcining process: Rotary kiln is a longitudinally inclined and rotatable steel cylinder structure lined with refractory materials. It is a thermal equipment used for mechanical, physical or chemical treatment of solid materials. The advantages of rotary kilns are large production capacity, high degree of automation, simple structure, single material, low cost, low unit capacity construction cost, fast construction speed, convenient raw material replacement, strong adaptability to raw materials, long service life, etc.;

3. Rotary bed calcining process: As a new type of anthracite calcining equipment, the process of the rotary bed calcining process is a process in which the raw material anthracite is heated at high temperature during the process from the hearth extension to the center position to achieve the raw material anthracite calcining process. The process has the characteristics of high calcination quality, low dust flying loss, high actual yield, small equipment footprint, convenient operation, etc.;

4. Coke oven calcination process: The coke oven is a furnace made of refractory bricks or other refractory materials for the calcination process of carbonized anthracite. It has the advantages of wide selection of raw materials, high calcination quality, and automatic management;

5. Electric calcining furnace: The raw material of anthracite is a resistance. The electric calcining furnace formally grasps this point and realizes the calcination process of anthracite. The advantages of the electrothermal calciner are simple and compact structure, continuous and convenient operation, high degree of automation, low labor intensity of workers, high calcining temperature, and part of the forged material has semi-graphitized properties, and is especially suitable for calcining anthracite.