Method for preparing calcium carbide

A calcium carbide and carbon-based technology, applied in the direction of carbide, calcium carbide, etc., can solve problems such as high reaction temperature, long reaction time, and backward production technology

Inactive Publication Date: 2014-04-09
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Abstract
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Problems solved by technology

[0003] Although the calcium carbide industry has a history of more than 100 years, its production technology is still relatively backward
At present, the fixed bed (moving bed)-block raw material-arc heating method is still used. This process has a high reaction temperature (2000-2200 degrees Celsius) and a long reaction time (1-2 hours). Energy consumption up to 3250kw h, thermal efficiency is only 50%

Method used

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  • Method for preparing calcium carbide

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preparation example Construction

[0023] Thus, in the method for preparing calcium carbide in the embodiment of the present invention, raw coal and quicklime are pulverized into ultrafine powders, and co-pyrolysis is carried out to obtain direct raw material coke, semi-coke or a mixture of carbon black and quicklime for preparing calcium carbide, and further use The direct raw material is hot sent to an electric arc furnace to prepare calcium carbide. Therefore, the method combines the preparation of calcium carbide raw materials with the production of calcium carbide, and the calcium carbide can be directly prepared by using raw coal and quicklime. The limitation of the existing calcium carbide preparation method using coke, semi-coke or carbon black and quicklime as raw materials to prepare calcium carbide is avoided. Moreover, the method for preparing calcium carbide in the above-mentioned embodiments of the present invention pulverizes raw coal and quicklime and then pyrolyzes and smelts, which can signifi...

Embodiment

[0047] raw material:

[0048] Quicklime is used as the calcium-based raw material, and the CaO content is 92%.

[0049] Using lignite as the carbon-based raw material, the main properties of the lignite are shown in Table 1.

[0050] Table 1

[0051] project

unit

value

Remark

[0052] whole water

%

37

Receive base

fixed carbon

%

58

dry basis

Volatile matter

%

33

dry basis

Ash

%

9

dry basis

[0053] Preparation:

[0054] Firstly, the long-flame coal is dried by an indirect tube-type drum drying device. The drying heat source is 0.8MPa saturated steam, and the moisture content of the lignite after drying is 0.5%.

[0055] After drying, the lignite is pulverized with a ball mill, and the average particle size after pulverization is all less than 10 microns.

[0056] Mix the pulverized ultrafine lignite powder and quicklime (average particle size less than 10 mic...

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Abstract

The invention discloses a method for preparing calcium carbide, which comprises the following steps: drying a carbon-base raw material to obtain a dried carbon-base raw material; respectively crushing the dried carbon-base raw material and a calcium-base raw material to obtain a carbon-base powder and a calcium-base powder; mixing the carbon-base powder and calcium-base powder to obtain a mixture; forming the mixture to obtain a lump material; pyrolyzing the lump material to obtain high heating value synthetic gas, tar and a pyrolytic solid product, wherein the pyrolytic solid product contains coke, semicoke, carbon black and quicklime; and feeding the pyrolytic solid product into an arc furnace at the temperature of not lower than 450 DEG C to perform smelting in the arc furnace, thereby obtaining the calcium carbide. The method can obviously lower the smelting energy consumption and production cost, and further enhances the preparation efficiency and quality of the calcium carbide.

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 ), known as the mother of organic synthesis before the middle of the last century. At present, it is mainly used in the production of vinyl chloride, vinyl acetate and acrylic series products. More than 70% of PVC (polyvinyl chloride) production in China comes from calcium carbide acetylene. Calcium carbide plays a very important role in my country's economic development, and its output has been increasing in the past ten years, reaching 18.69 million tons in 2012. [0003] Although the calcium carbide industry has a history of more than 100 years, its production technology is still relatively backward. At present, the fixed bed (moving bed)-block raw material-arc heating method is still used. This process has a high reaction temperature (2000-2200 degrees Celsiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/32C01B32/942
Inventor 吴道洪张佼阳丁力
Owner SHENWU ENVIRONMENTAL TECH CO LTD
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