Method for preparing calcium carbide

A calcium carbide and lime technology, applied in the field of calcium carbide preparation, can solve the problems of high energy consumption and unrealized industrialization of calcium carbide process, and achieve the effects of saving energy consumption, saving smelting time, and reducing smelting temperature

Inactive Publication Date: 2015-04-22
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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, 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

Method used

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  • Method for preparing calcium carbide

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preparation example Construction

[0020] The method for preparing calcium carbide in the above-mentioned embodiments of the present invention combines the oxythermal method and the closed electric furnace method. By mixing excessive raw coal powder and lime powder in advance, performing pyrolysis and combustion, a high-temperature and close-contact semi-coke and lime powder are obtained. The pellet material is sent to the electric furnace for smelting treatment, which can significantly reduce the smelting temperature, save smelting time, and save energy consumption.

[0021] S100: drying treatment

[0022] According to a specific embodiment of the present invention, the raw coal is firstly dried to obtain dried raw coal. According to specific embodiments of the present invention, the type of raw coal is not particularly limited, for example, it may be cheap low-rank coal, thereby reducing costs. Moreover, the use of low-rank coal as the raw material for preparing calcium carbide can also expand the selection ...

Embodiment

[0046] raw material:

[0047] Quicklime is used as the calcium-based raw material, and the CaO content is greater than 92%;

[0048] 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.

[0049] Table 1

[0050] project

unit

value

Remark

whole water

％

13

Receive base

fixed carbon

％

58

dry basis

Volatile matter

％

36

dry basis

Ash

％

6

dry basis

[0051] Preparation:

[0052] 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%.

[0053] After drying, the long-flame coal is pulverized by a mechanical mill, and the average particle size after pulverization is less than 10 microns.

[0054] 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 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/32C01B32/942
Inventor 吴道洪张顺利郭启海丁力董宾路丙川郑倩倩
Owner SHENWU ENVIRONMENTAL TECH CO LTD
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