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Method of producing calcium chloride from industrial waste carbide slag

A technology of industrial waste and carbide slag, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve problems such as waste of resources and environmental pollution, and achieve full utilization of resources and reduction of environmental pollution Effect

Inactive Publication Date: 2007-03-07
游川北
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production of polyvinyl chloride or other factories that need acetylene, a kind of industrial waste calcium carbide slag will be produced. For a long time, this waste has not been fully utilized and treated, and it is generally treated by the method of stacking yards, which has caused environmental pollution. pollution and waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] In a 1000ml beaker, add 500ml of industrial hydrochloric acid with a concentration of 31%, start stirring, slowly add 310g of carbide slag (the calcium carbide slag contains 35% water, and the dry basis calcium hydroxide content is 90%) to control the reaction temperature to 60°C , after detecting the pH value of the reaction solution to be 7.0, filter, add 1g activated carbon and 0.6g barium chloride to the filtrate, and after stirring for 1 hour, filter, and the filtrate is concentrated to obtain 304g calcium chloride dihydrate product, after testing its chlorine content Calcium 74%, the remaining indicators meet industry standards.

Embodiment 2

[0013] After reacting according to the above conditions to obtain the filtrate for removing sulfate ions, after concentrating until the concentration of calcium chloride reaches 68%, put it in a 300°C oven for dehydration and drying for 2 hours to obtain 230g of anhydrous calcium chloride. The calcium content is 98%, and the remaining indicators are in line with the industry standard high-grade product indicators.

Embodiment 3

[0015] Add 3000L of industrial hydrochloric acid with a concentration of 31% in a 5000L enamel kettle, start stirring and jacket cooling water, slowly add 1900Kg of calcium carbide slag, the water content of calcium carbide slag is 35%, and the dry basis calcium hydroxide content is 90%, to control the reaction The temperature is 60-70 degrees, react for 30 minutes after feeding, take a sample to check that the pH value is 6.5, filter the reaction solution, add 5Kg of activated carbon to the filtrate, react with 4Kg of barium chloride for 30 minutes and then filter, send the filtrate to the concentration device to concentrate to the concentration 60%, and then sent to the spray drying device for dehydration and drying to obtain 1400Kg anhydrous calcium oxide product.

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Abstract

The invention discloses a manufacturing method of calcium chloride through industrial waste carbide slag, which comprises the following steps: adding 20-40% industrial alcaine in the autoclave; adding carbide slag to react; controlling reacting temperature at 40-95 deg.c; terminating the reaction when the pH value is 5-8; filtering the product; adding activated carbon to discolor; adding barium chloride to remove sulfate ion; filtering; condensing the filtrate; crystallizing; drying to obtain calcium chloride.

Description

technical field [0001] The invention relates to a method for preparing calcium chloride, in particular to a method for producing calcium chloride by using industrial waste calcium carbide slag. Background technique [0002] There are currently two production routes for calcium oxide products. One is to use limestone as raw material to obtain calcium chloride products by reacting with hydrochloric acid; the other is to produce calcium chloride from calcium chloride wastewater by-product of soda ash plant. In the production of polyvinyl chloride or other factories that need acetylene, a kind of industrial waste calcium carbide slag will be produced. For a long time, this waste has not been fully utilized and treated, and it is generally treated by the method of stacking yards, which has caused environmental pollution. Pollution wastes resources. Contents of the invention [0003] The purpose of the present invention is to provide a kind of industrial waste carbide slag prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/24
Inventor 游川北
Owner 游川北
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