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Material circulating system formed in chlor-alkali industry by using waste carbide slags and chlorine water

A technology of chlor-alkali industry and circulation system, applied in the directions of alkali metal chloride, calcium/strontium/barium chloride, hypochlorous acid, etc., can solve problems such as lack of thorough treatment

Inactive Publication Date: 2010-01-13
南通宙亚电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no thorough treatment. Although chlorine gas and chlorine radicals and hypochlorous acid and hypochlorite radicals are removed to reduce pollution, pollutants still exist

Method used

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  • Material circulating system formed in chlor-alkali industry by using waste carbide slags and chlorine water
  • Material circulating system formed in chlor-alkali industry by using waste carbide slags and chlorine water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 100kg of waste carbide slag (calcium hydroxide content is 90%; dry material) and 300kg of dull chlorine water are injected into the preprocessor (5) with a stirring device and stirred to form a uniform emulsion, which is naturally settled for 30s to form a suspension Calcium hydroxide emulsion; Calcium hydroxide emulsion and hydrochloric acid inject purifier (6) by pure substance quality 1: 0.8, stir 10 minutes and make material reach complete reaction, after reaction solution pumps filter, form calcium chloride filtrate And filter cake; The sodium hydroxide that calcium chloride filtrate and electrolysis generate are injected in secondary reactor (7) by pure substance quality 1: 0.6 and stir, generate high-purity calcium hydroxide and relatively pure sodium chloride solution containing solute 93.28kg , sodium chloride solution is sent into the electrolysis workshop after being refined by soda ash and hydrochloric acid to carry out the recycling of the electrolysis works...

Embodiment 2

[0029] Technical process is as embodiment 1, 100kg waste calcium carbide slag (calcium hydroxide content is 90%; Dry material meter) and 600kg water, natural sedimentation 50s, calcium hydroxide emulsion and hydrochloric acid are by pure substance quality 1: 1.2, stir 10 Minutes, calcium chloride filtrate and the sodium hydroxide that electrolysis generates are by pure substance quality 1: 1.1, make relatively pure sodium chloride solution containing solute 134.39kg, high-purity calcium hydroxide and chlorine gas pure substance quality 1: 1.1, accompli 87.44kg of bleached powder refined product, filter cake and the hydrochloric acid solution of concentration 10% are reacted, both obtained 6kg of high-quality activated carbon products, make 52.98kg calcium chloride dihydrate.

Embodiment 3

[0031] Technical process is as embodiment 1, 100kg waste calcium carbide slag (calcium hydroxide content is 90%; Dry material meter) and 200kg water, natural sedimentation 20s, calcium hydroxide emulsion and hydrochloric acid are by pure substance quality 1: 0.6, stir 10 Minutes, the calcium chloride filtrate and the sodium hydroxide that electrolysis generates are by pure substance quality 1: 0.4, make relatively pure sodium chloride solution containing solute 46.64kg, high-purity calcium hydroxide and chlorine gas pure substance quality 1: 0.4, complete 16.87kg of bleached powder refined product, filter cake and the hydrochloric acid solution of concentration 10% are reacted, both obtained 6kg of high-quality activated carbon products, made 10.22kg calcium chloride dihydrate.

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Abstract

The invention discloses a material circulating system formed in the chlor-alkali industry by using waste carbide slags and chlorine water. The system is specifically as follows: after being preprocessed, the waste carbide slags react with hydrochloric acid and the reactant is filtered to obtain calcium chloride solution; the filtrate and sodium hydroxide generated in electrolysis in chlor-alkali plants generate high-purity calcium hydroxide; bleaching powder concentrate is produced after the calcium hydroxide is chloridized, centrifuged, dried and broken; filter cakes react with the hydrochloric acid to produce active carbon; calcium chloride generated in the reaction can be produced into calcium chloride dehydrate and calcium chloride anhydrous; after being processed, sodium chloride serves as a raw material for electrolysis. The system effectively solves the processing and disposal problems of the waste hydrated limes and the raw material problems in the chlor-alkali industry, embodies the circular economy, produces the byproducts including the bleaching powder concentrate and the active carbon and the products including the calcium chloride dehydrate and the calcium chloride anhydrous and improves the deep processing capabilities of the enterprises.

Description

Technical field: [0001] The invention belongs to the technical field of chemical waste treatment, in particular to a material circulation system formed in the chlor-alkali industry by using waste calcium carbide slag and chlorine water. technical background: [0002] At present, a small part of the chlorine water utilization in the chlor-alkali plant is returned to the salt pond to circulate the salt. Its three wastes treatment mainly relies on alkaline substances for neutralization, usually using calcium carbide slag or slaked lime for neutralization into calcium hypochlorite and Calcium chloride is directly drained away. There is no thorough treatment. Although the removal of chlorine gas and chlorine radicals as well as hypochlorous acid and hypochlorite radicals has reduced the pollution, the pollutants still exist. The invention not only effectively controls the pollution of chlorine water in a chlor-alkali plant, turns waste into treasures into chemical products, but ...

Claims

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Application Information

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IPC IPC(8): C01B11/06C01D3/04C01B31/08C01F11/24C25B1/34
Inventor 王嘉兴
Owner 南通宙亚电子科技有限公司
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