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Method for preparing calcium carbide

A calcium carbide and quicklime technology, applied in the direction of carbide, calcium carbide, etc., can solve the problems of high reaction temperature, backward production technology and long reaction time.

Active Publication Date: 2014-04-09
SHENWU ENVIRONMENTAL TECH CO LTD
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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
  • Method for preparing calcium carbide
  • Method for preparing calcium carbide

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Experimental program
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Embodiment

[0064] Raw materials:

[0065] Quicklime is used as the calcium-based raw material, and the CaO content is 93%.

[0066] The long-flame coal is used as the carbon-based raw material, and the main properties of the long-flame coal are shown in Table 1.

[0067] Table 1 Main properties of long-flame coal

[0068]

[0069] Preparation:

[0070] First, 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 long-flame coal after drying is 0.3%. The quicklime and the dried long-flame coal are respectively crushed with a hammer crusher, and the average particle size after crushing is both less than 2 mm. Further, the long-flame coal particles and the quicklime particles were mixed in a strong mixer for 0.5h according to the mass ratio of 1:2.2, so as to mix well.

[0071] The mixed powder is sent into the heat-free pyrolysis heat storage rotary bed, and the pyrolysis treatment...

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Abstract

The invention discloses a method for preparing calcium carbide, which comprises the following steps: providing carbon-base particles and calcium-base particles, wherein the average particle size of the carbon-base particles and calcium-base particles is not greater than 5 millimeters, and the water content is lower than 5%; mixing the carbon-base particles and calcium-base particles to obtain a mixture; pyrolyzing the mixture to obtain high-quality tar, high heating value gas and a pyrolytic solid product, wherein the pyrolytic solid product contains quicklime and one of coke, semicoke and carbon black; and feeding the pyrolytic solid product into a gas smelting furnace at the temperature of not lower than 450 DEG C to perform smelting in the gas smelting furnace, thereby obtaining the calcium carbide. Thus, the method can further enhance the heat utilization ratio and production efficiency, lower the production cost and reduce the energy consumption and pollution.

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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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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