Method for preparing calcium carbide

Abstract

The invention provides a method for preparing calcium carbide. The method comprises the steps that raw coal is subjected to drying processing, and dry raw coal is obtained conveniently; the dry raw coal and lime are subjected to smashing respectively, so that raw coal powder and lime powder are obtained conveniently; excess raw coal powder and the lime powder are mixed, so that mixed materials are obtained conveniently; the mixed materials are subjected to ball pressing, so that palletizing materials are obtained conveniently; the palletizing materials are subjected to pyrolysis treatment, so that artificial petroleum, artificial natural gas and pyrolysis solid products are obtained conveniently, wherein the pyrolysis solid products have semicoke and lime; the pyrolysis solid products are conveyed into a burning bin for burning processing in a hot mode, so that pyrolysis solid is obtained conveniently; and the pyrolysis solid is conveyed into a sealed electric furnace for smelting processing, and the calcium carbide is obtained conveniently. According to the method, smelting energy loss and production cost can be lowered obviously, and meanwhile calcium carbide production efficiency can be further improved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular, the invention relates to a method for preparing calcium carbide. Background technique [0002] Calcium carbide (CaC 2 ), react with water to generate acetylene, which can generate thousands of organic chemical products with acetylene as raw material, and was known as the mother of organic synthesis before the middle of last century. At present, it is mainly used to produce series products such as vinyl chloride, vinyl acetate and acrylic acid. More than 70% of PVC (polyvinyl chloride) production in China comes from calcium carbide acetylene. Calcium carbide plays a very important role in the economic development of our country. The output has been increasing in the past ten years, and the output in 2013 reached more than 22 million tons. [0003] The production technology of calcium carbide is relatively backward. At present, there are mainly two production processes: electrother...

AI Technical Summary

Problems solved by technology

The oxythermal method is to add excess fuel (coal, heavy oil or natural gas, etc.), and use the excess fuel to burn to release heat, to partially replace the arc heating, and reduce the power consumption in the production process of calcium carbide. However, the oxythermal method uses block raw materials , the production temperature of calcium carbide is above 2000°C, and there is still the problem of high energy consumption

So far, the process of preparing calcium carbide by oxythermal method has not been industrialized

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