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Method for producing calcium nitrate by carbide slag

A technology of calcium nitrate and calcium carbide slag, applied in the direction of calcium/strontium/barium nitrate, solid waste removal, etc., can solve the problems such as insufficient utilization of effective components, and achieve the effect of simple method and less equipment investment

Inactive Publication Date: 2011-07-06
马艳荣
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  • Summary
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Problems solved by technology

At present, calcium carbide slag is mainly used to make cement and building materials, and its effective ingredients have not been fully utilized

Method used

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Embodiment 1

[0008] A method for producing calcium nitrate with calcium carbide slag. Grinding 500kg of calcium carbide slag into 80-100 mesh coarse powder, placing it in a reactor and fully mixing it with 500kg of water, and then pouring excess hydrochloric acid into the reactor to make calcium carbide slag The oxide of oxide is converted into soluble chloride, then, filter reaction product, obtain the filtrate containing mainly calcium chloride, also contain a small amount of aluminum chloride and ferric chloride in the filtrate; The filtrate reacts with excess carbonic acid solution, calcium ions and carbonate ions combine to form calcium carbonate and precipitate, and after filtration, a calcium carbonate filter cake is obtained; then the calcium carbonate filter cake is reacted with nitric acid to obtain a mixture of calcium nitrate precipitation and carbonic acid solution; nitric acid The mixture of calcium precipitate and carbonic acid solution is separated by filtration to obtain ca...

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Abstract

The invention provides a method for producing calcium nitrate by carbide slag, which comprises the steps of: grinding the carbide slag into coarse powders with 80-100 meshes, putting the coarse powders into a reactor to be abundantly mixed with the water, putting the excessive hydrochloric acid into a reactor, converting oxide in the carbide slag into soluble chloride, and filtering a reaction product to obtain filter liquor which takes calcium chloride as a main part; reacting the filter liquor which takes the calcium chloride as the main part with excessive carbonic acid solution, combining calcium ions with carbonate ions into calcium carbonate to be precipitated, and filtering to obtain a calcium carbonate filter cake, and reacting the calcium carbonate filter cake with hydrogen nitrate solution to obtain calcium nitrate precipitate and carbon acid solution mixture; and separating the calcium nitrate precipitate from the carbon acid solution mixture in a filtering way to obtain the carbonic acid filter liquor and the calcium carbonate filter cake, and drying and smashing the calcium carbonate filter cake to obtain a calcium carbonate product. The method is simple in operation and small in equipment investment, and the obtained calcium nitrate product is high in purity and economic value.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of carbide slag, in particular to a method for producing calcium nitrate by using carbide slag. Background technique [0002] Carbide slag mainly comes from the production of calcium carbide polyvinyl chloride and vinyl acetate. The production of 1 ton of polyvinyl chloride consumes about 1.45 tons of calcium carbide, and each ton of calcium carbide produces 1 ton of calcium carbide slag after hydrolysis, so 2 tons of calcium carbide slag need to be discharged for every 1 ton of polyvinyl chloride produced. Calcium carbide slag is large in quantity, high in alkali content, and contains harmful substances such as sulfur and arsenic. If discharged without treatment, it will block sewers, accumulate river beds, and endanger fishery production. Stacking on land takes up land and pollutes the environment. [0003] The main composition of calcium carbide slag is calcium oxide, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/36B09B3/00
Inventor 马艳荣
Owner 马艳荣
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