Method for preparing calcium carbide

Abstract

The invention provides a method for preparing calcium carbide. The method comprises steps as follows: raw coal is dried so as to obtain dried raw coal; the dried raw coal and lime are smashed respectively so as to obtain raw coal powder and lime powder; excessive raw coal powder and lime powder are mixed so as to obtain a mixed material; the mixed material is pressed into pellets, so that pellet materials are obtained; the pellet materials are subjected to pyrolysis treatment, so that artificial petroleum, artificial natural gas and solid pyrolysis products are obtained, wherein the solid pyrolysis products contain semi coke and lime; the solid pyrolysis products are sent to a gas smelting furnace through hot delivery, a little air is introduced into the gas smelting furnace, and accordingly, smelting processing can be performed in the gas smelting furnace to obtain calcium carbide. The smelting energy consumption and the production cost can be obviously reduced with the method, and meanwhile, the production efficiency of the calcium carbide 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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