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Method for producing gypsum fiber from calcium carbide mud

A technology of gypsum fiber and calcium carbide mud, which is applied to the removal of solid waste, calcium/strontium/barium sulfate, iron sulfide, etc., can solve the problems of reducing the value of calcium carbide mud and waste sulfuric acid recycling, environmental pollution, etc. The effect of large size, short process flow and simple operation

Inactive Publication Date: 2017-04-19
荣殿相
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only reduces the recycling value of calcium carbide mud and waste sulfuric acid, but also causes serious pollution to the environment

Method used

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Experimental program
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Embodiment Construction

[0029] The present invention uses calcium carbide mud as raw material to produce the method for gypsum fiber, at first is to neutralize and decompose calcium carbide mud with nitric acid to obtain calcium nitrate solution, and release hydrogen sulfide tail gas, and its reaction condition is: reaction time is controlled at 10-30min, after the reaction is completed, the material The temperature is controlled at 75-95°C and the pH value is controlled at 5-7. Secondly, the material obtained from the above reaction is subjected to coarse filtration and fine filtration to remove solid impurities to obtain a fine calcium nitrate solution.

[0030] Then, the fine calcium nitrate solution is converted into gypsum fiber with sulfuric acid, and the finished gypsum fiber (CaSO 4 2H 2 o). The specific operation steps are: add fine calcium nitrate solution and sulfuric acid into the reactor in turn, heat until the initial shape of gypsum fibers appears, stop heating, cool down to 60-10°C,...

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Abstract

The invention discloses a method for producing plaster fiber by using carbide slurry. The method comprises steps of neutralizing the carbide slurry by using nitric acid, obtaining a calcium nitrate solution, separating solid from liquid, preparing a fine calcium nitrate solution, converting the fine calcium nitrate solution to the plaster fiber by using sulphuric acid, separating the solid from the liquid, obtaining product plaster fiber, absorbing hydrogen sulfide tail gas by using iron dichloride which is generated through soaking of iron scraps in hydrochloric acid and sodium hydroxide, and preparing ferrous sulfide. By the aid of the method, waste is used for processing waste, the waste is turned into useful things, and the problem that the carbide slurry pollutes the environment is solved. The composite plastic fiber product is good in quality, wide in application, low in cost, high in added value and good in economic benefit. By product ferrous sulfide has high added value. The method is short in process and simple to operate.

Description

technical field [0001] The invention relates to the utilization technology of calcium carbide mud, in particular to a method for producing gypsum fiber with calcium carbide mud as raw material. Background technique [0002] Calcium carbide mud and waste sulfuric acid are by-products of calcium carbide acetylene production of polyvinyl chloride. The concentration of waste sulfuric acid is low (about 75%), the corrosion is serious, and it is extremely difficult to export and sell it. The composition of calcium carbide mud is complex, the main component is calcium hydroxide, and it also contains a small amount of overburned magnesium oxide and calcium oxide, trace amounts of calcium carbide and calcium sulfide, and acid insoluble matter and water. Currently, the treatment of calcium carbide mud is used for production Cement, mixed with fly ash to make bricks or stacked. This not only reduces the recycling value of calcium carbide mud and waste sulfuric acid, but also causes s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01G49/12B09B3/00
Inventor 荣殿相
Owner 荣殿相
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