The product of the calcium carbide furnace is calcium carbide, with a molecular formula of CaC2 and a molecular weight of 64.10. Industrial products are gray, yellow brown, or black solids, and those with high calcium carbide content appear purple. The newly fractured surface of calcium carbide has a glossy appearance, but when exposed to air, it loses its luster due to moisture absorption and appears grayish white. Relative density 2.22 (18 ℃). Industrial products generally contain 80% calcium carbide. Melting point 2300 ℃. Can conduct electricity, the higher the purity, the easier it is to conduct electricity. The chemical properties are very active and can react with many gases and solutions at appropriate temperatures. Intense decomposition in contact with water produces acetylene gas and calcium hydroxide, releasing a large amount of heat. Intense chemical reactions can occur with chlorine, hydrogen chloride, sulfur, phosphorus, ethanol, etc. at high temperatures.

    Calcium carbide has many uses and is an important basic raw material for organic synthesis industry. Ethylene, chloroprene rubber, calcium cyanamide, acetic acid, trichloroethylene, etc. can be produced from calcium carbide acetylene as raw material. Calcium carbide is also used as a desulfurizer for steel and is also used for metal cutting and welding.

    From the perspective of the development trend of mineral thermal furnaces, closed mineral thermal furnaces with low pollution, advanced process equipment, low energy consumption, safety and efficiency will replace open mineral thermal furnaces.

The combination control system has the following advantages

1. Strong applicability, can be used for different powers and electrode diameters of mineral thermal furnaces.

2. Compared with the submerged arc furnace using copper tiles as the conductive element, the contact resistance between the conductive element and the electrode shell is better than other forms of contact resistance due to the use of springs and bolts for compression, and there is no arcing and stable current transmission.

3. Due to the enclosed design of the conductive element, it is not exposed to high temperature radiation, and its temperature rise is significantly lower than other forms of conductive elements, resulting in a significant increase in conductivity.

4. Due to the reduction of contact resistance and the improvement of conductivity, coupled with internal water cooling, the electrical efficiency and power factor are significantly improved, resulting in energy savings of over 5% and material savings of around 20%.

5. Due to the reasonable structural design, the service life of conductive components has been doubled. The daily maintenance costs have been greatly reduced, and the equipment utilization rate has significantly increased.