Method for preparing calcium carbide

A calcium carbide and lime technology, applied in the field of calcium carbide preparation, can solve the problems of unindustrialization and high energy consumption of the calcium carbide process

Inactive Publication Date: 2015-04-29
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Application Information

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, t...

Method used

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  • Method for preparing calcium carbide

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preparation example Construction

[0021] Therefore, the method for preparing calcium carbide in the embodiment of the present invention crushes raw coal and lime into ultra-fine powders, and performs co-pyrolysis to obtain a mixture of semi-coke and lime, the direct raw material for preparing calcium carbide, and further uses the direct raw material to heat Prepare calcium carbide in a gas melting furnace. Therefore, this method couples pyrolysis and calcium carbide production process, and can use cheap low-rank coal to replace expensive coke or semi-coke to prepare calcium carbide, thereby reducing the cost of raw materials and avoiding the use of coke or semi Coke and quicklime are the limitations of preparing calcium carbide as raw materials. At the same time, during the pyrolysis process, high value-added man-made oil and man-made natural gas can be produced by-product, which improves the economy. Furthermore, in the method for preparing calcium carbide in the above-mentioned embodiments of the present in...

Embodiment

[0045] raw material:

[0046] Quicklime is used as the calcium-based raw material, and the CaO content is greater than 92%;

[0047] The long-flame coal is used as the carbon-based raw material. The main properties of the long-flame coal are shown in Table 1.

[0048] Table 1

[0049] project

unit

value

Remark

whole water

％

13

Receive base

fixed carbon

％

61

Dry basis

Volatile matter

％

33

Dry basis

Ash

％

6

Dry basis

[0050] Preparation:

[0051] First, the raw coal is dried with a chain plate dryer, the drying heat source is hot flue gas at 120-180°C, and the moisture content of the long-flame coal after drying is less than 0.8%.

[0052] After drying, the long-flame coal is pulverized by a mechanical mill, and the average particle size after pulverization is less than 10 microns.

[0053] The pulverized long-flame coal powder and lime powder are mixed in an intensive ...

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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...

Claims

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Application Information

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IPC IPC(8): C01B31/32C01B32/942
Inventor 吴道洪张顺利丁力郭启海董宾路丙川郑倩倩
Owner SHENWU ENVIRONMENTAL TECH CO LTD
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