Method for producing calcium carbide by virtue of waste gas

A technology of calcium carbide and exhaust gas, applied in chemical instruments and methods, climate sustainability, inorganic chemistry, etc., can solve problems such as suboptimal comprehensive utilization schemes, achieve huge economic and environmental benefits, and improve economic benefits

Active Publication Date: 2015-02-18
云南云博天环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For a long time, people have various plans for the utilization of calcium carbide tail gas, such as using calcium carbide tail gas carbon monoxide to burn boilers, using calcium carbide tail gas carbon monoxide to generate electricity, etc., but none of them is the most ideal comprehensive utilization plan

Method used

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  • Method for producing calcium carbide by virtue of waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1As shown, a method for producing calcium carbide using waste gas is characterized in that it includes a calcium carbide furnace charge pellet production system, a calcium carbide waste gas recovery and utilization system, a calcium carbide production system and a liquid carbon dioxide production system,

[0043] The described calcium carbide charge pellet production system comprises the steps:

[0044] Step (1), the selection of raw materials for calcium carbide furnace charge pellets: the first is calcium oxide dust and carbon powder in the waste gas dust of calcium carbide production; the second is to select limestone with a calcium content ≥ 50%; Mineral processing, fixed carbon ≥ 90%, ash content ≤ 2.5% purified carbon powder; the fourth is to choose Xuguang brand new composite industrial gasification briquette binder;

[0045] In step (2), the calcium carbide furnace charge pellet raw material selected in step (1) is processed through the raw mater...

Embodiment 2

[0059] The difference between embodiment 2 and embodiment 1 is:

[0060] In the step (2), according to the mass percentage, the limestone powder and reclaimed calcium oxide powder account for 80%; the purified carbon powder and reclaimed carbon powder account for 16%, and the binding agent accounts for 4%; the raw material treatment process is Crush the limestone to a particle size of 2.9mm;

[0061] Add water at the inlet of the primary mixer in step (3), so that the mass fraction of the total moisture is 14% of the material;

[0062] Drying in step (5) until the moisture content of the pelletized calcium carbide is 5%;

[0063] All the other are identical with embodiment 1.

Embodiment 3

[0065] The difference between embodiment 3 and embodiment 1 is:

[0066] In the step (2), according to the mass percentage, the limestone powder and reclaimed calcium oxide powder account for 70%; the purified carbon powder and reclaimed carbon powder account for 26%, and the binding agent accounts for 4%; the raw material treatment process is Crush the limestone to a particle size of 3.1mm;

[0067] Add water at the inlet of the primary mixer in step (3), so that the mass fraction of the total moisture is 10% of the material;

[0068] Dry in step (5) until the moisture content of the pelletized calcium carbide is 3%;

[0069] All the other are identical with embodiment 1.

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Abstract

The invention relates to a process technology for producing calcium carbide by virtue of waste gas, dust and waste heat, and belongs to the technical field of industrial production of calcium carbide. Dust in the waste gas produced in calcium carbide production is recovered as a part of raw materials for calcium carbide production according to a chemical principle of calcium carbide production, a new powdery raw material is supplemented, a high-performance Xuguang calcium carbide binder is added to prepare pellets, a great amount of heat produced by combusting carbon monoxide in the calcium carbide waste gas and the sensible heat of furnace gas are taken as heat sources for drying the calcium carbide pellets, tail gas containing more than or equal to 70 percent of carbon dioxide is produced by the combustion of carbon monoxide, carbon dioxide is separated by a pressure swing absorption gas separation technology or a membrane separation technology, and according to market demands, liquid carbon dioxide with high added value is prepared by a cryogenic technology, or dry ice is further prepared. According to the process technology, the calcium carbide waste gas, dust and waste heat are effectively utilized, energy is saved, consumption is reduced, and the economic benefits of a calcium carbide enterprise are comprehensively improved.

Description

technical field [0001] The invention belongs to the technical field of calcium carbide industrial production, and in particular relates to a production process technology which changes the traditional production process of calcium carbide by making full use of waste gas in the production of calcium carbide. Background technique [0002] The traditional process of producing calcium carbide is to put quicklime (calcium oxide) block material and coke (reducing agent) into the calcium carbide furnace, and produce calcium carbide, namely calcium carbide, through arc high-temperature melting reaction. This production process produces a large amount of carbon monoxide tail gas, which contains calcium oxide and carbon dust. [0003] For a long time, people have various plans for the utilization of calcium carbide tail gas, such as using carbon monoxide of calcium carbide tail gas to burn boilers, using carbon monoxide of calcium carbide tail gas to generate electricity, etc., but no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/32C01B31/20C01B32/942C01B32/50
CPCY02P20/10Y02P20/129
Inventor 许伟张时能段云龙
Owner 云南云博天环境科技有限公司
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