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Process for producing calcium carbonate by utilizing waste carbide slag

A technology of calcium carbonate and waste calcium carbide, which is applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of high processing cost, long time-consuming, low income, etc., and achieve the effect of solving environmental pollution problems

Inactive Publication Date: 2014-03-12
TIANJIN SHENGTIANSHI IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These disposal methods take a long time, the processing cost is high, and the income obtained is small, which has become a burden for the industry and enterprises.

Method used

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Examples

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Embodiment

[0018] A kind of technology that utilizes waste carbide slag to produce calcium carbonate, comprises the following steps:

[0019] (1) Carbide slag pretreatment

[0020] Carbide slag contains a small amount of CaS, Ca 3 P 2 and other impurities, while calcium carbide is hydrolyzed to acetylene, CaS, Ca 3 P 2 and other impurities are also hydrolyzed to generate H 2 S, H 3 P et al. h 2 S, H 3 Most of P and other gases can be discharged together with acetylene gas, but there is still a small amount of H 2 S, H 3 P and CaH 2 Residues in the carbide slag make the carbide slag have a certain pungent smell. Therefore, it is necessary to perform high-temperature pretreatment on carbide slag, put it into a fluidized fluidized furnace for calcination and drying at a high temperature of 120°C, and remove volatile gases, while its color changes from gray to gray.

[0021] Specifically, the industrial waste calcium carbide is dehydrated for the first time, and the water content...

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PUM

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Abstract

The invention discloses a process for producing calcium carbonate by utilizing waste carbide slag. The process comprises the following steps: (1) carbide slag pretreatment; (2) alkali and impurity removal by using ammonium chloride; (3) carbonization. The calcium carbonate is produced with a method of drying waste carbide at high temperature and removing alkali, so that the problem of environmental pollution in the current treatment method is solved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a process for producing calcium carbonate by utilizing waste carbide slag. Background technique [0002] Calcium carbide slag is the waste residue mainly composed of calcium hydroxide after hydrolysis of calcium carbide to obtain acetylene gas. Its main component is Ca(OH) 2 , can be used as a substitute for slaked lime. When the moisture content of calcium carbide waste residue is >50%, its shape is thick slurry, which is difficult to store and transport. Enterprises are likely to pollute the road during transportation. [0003] Therefore, the key to the comprehensive utilization of calcium carbide residue is to control the water content. The traditional treatment methods of calcium carbide residue include sea reclamation, ditch filling, regular stacking, natural settlement and sale, replacing limestone to make cement, producing quicklime as calcium carbide raw ma...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 王宝林
Owner TIANJIN SHENGTIANSHI IND & TRADE
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