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Method for preparing copper sulfide, calcium carbonate and sodium hydroxide from sodium sulfide waste

A technology of sodium hydroxide and alkali sulfide, applied in chemical instruments and methods, alkali metal oxides/hydroxides, copper sulfide, etc., can solve problems such as potential safety hazards, poisoning, and environmental pollution, and achieve the effect of eliminating pollution

Active Publication Date: 2013-01-02
NANTONG BOTAO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the hydrogen sulfide gas generated by reacting with water will cause poisoning and even death after being absorbed into the human body. Therefore, if the waste alkali sulfide residue is not utilized and treated, it will not only cause environmental pollution, but also pose certain safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method for preparing copper sulfide, calcium carbonate and sodium hydroxide with soda sulfide waste residue, its raw material is barium sulfate by-product sodium sulfide method gained soda sulfide waste residue, comprises the steps:

[0023] Step A: convert the sodium carbonate content in the sodium sulfide waste residue, and the alkali sulfide waste residue is pulverized into 80 orders, and then configure the alkali sulfide waste residue suspension and copper bicarbonate solution;

[0024] Step B: The alkali sulfide waste residue suspension and the copper bicarbonate solution are successively put into the anti-corrosion reactor at a ratio of 1:0.8 of the molar content of the sodium sulfide and the copper bicarbonate pure substance, and the chemical reaction is carried out to obtain copper sulfide-containing, A mixture of sodium carbonate and sodium bicarbonate;

[0025] Step C: the mixture obtained in step B is filtered through a filter to obtain a clear solution c...

Embodiment 2

[0032] The method for preparing copper sulfide, calcium carbonate and sodium hydroxide with soda sulfide waste residue, its raw material is barium sulfate by-product sodium sulfide method gained soda sulfide waste residue, comprises the steps:

[0033] Step A: convert the sodium carbonate content in the sodium sulfide waste residue, and the alkali sulfide waste residue is pulverized into 90 orders, and then configure the alkali sulfide waste residue suspension and copper bicarbonate solution;

[0034] Step B: the sodium sulfide waste slag suspension and the copper bicarbonate solution are successively put into the anti-corrosion reactor at a ratio of 1:1 of the molar content of the sodium sulfide and the copper bicarbonate pure substance, and the chemical reaction is carried out to obtain copper sulfide-containing, A mixture of sodium carbonate and sodium bicarbonate;

[0035] Step C: the mixture obtained in step B is filtered through a filter to obtain a clear solution contai...

Embodiment 3

[0042] The method for preparing copper sulfide, calcium carbonate and sodium hydroxide with soda sulfide waste residue, its raw material is barium sulfate by-product sodium sulfide method gained soda sulfide waste residue, comprises the steps:

[0043] Step A: convert the sodium carbonate content in the sodium sulfide waste residue, and the alkali sulfide waste residue is pulverized into 100 orders, and then configure the alkali sulfide waste residue suspension and copper bicarbonate solution;

[0044] Step B: the sodium sulfide waste residue suspension and the copper bicarbonate solution are successively put into the anti-corrosion reactor with the molar content ratio of sodium sulfide and copper bicarbonate pure substance at a ratio of 1:1.2, and chemical reaction is carried out to obtain copper sulfide-containing, A mixture of sodium carbonate and sodium bicarbonate;

[0045] Step C: the mixture obtained in step B is filtered through a filter to obtain a clear solution cont...

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PUM

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Abstract

The invention provides a method for preparing copper sulfide, calcium carbonate and sodium hydroxide from sodium sulfide waste. The sodium sulfide waste mixes and reacts with copper bicarbonate to produce a mixture containing copper sulfide, sodium carbonate and sodium bicarbonate; the mixture is filtered to produce a clear filtrate containing sodium carbonate and sodium bicarbonate and a filter cake containing copper sulfide; the filter cake containing copper sulfide is washed, dried and pulverized to obtain a copper sulfide product; the filtrate containing sodium carbonate and sodium bicarbonate reacts with an excessive amount of calcium hydroxide solution to produce a mixture containing calcium carbonate precipitates and sodium hydroxide solution; the mixture is filtered to obtain a filter cake of calcium carbonate and a liquid containing sodium hydroxide; and the filter cake of calcium carbonate is washed, dried and pulverized to obtain a calcium carbonate product; and the liquid containing sodium hydroxide is distilled to produce a supersaturated solution of sodium hydroxide, and the supersaturated solution of sodium hydroxide is spray-dried to obtain a sodium hydroxide product. The method eliminates the environmental pollution due to sodium sulfide waste, makes the best use of the potential value of the sodium sulfide waste, achieves the purpose of turning waste into treasure, and has a high practical value.

Description

technical field [0001] The present invention relates to the technical field of treatment and utilization of sodium sulfide waste residue obtained by the barium sulfate by-product sodium sulfide method, in particular to a method for preparing copper sulfide, calcium carbonate and sodium hydroxide with the alkali sulfide waste residue, the raw material of which is barium sulfate by-product sodium sulfide Alkali sulfide residue obtained by the method. Background technique [0002] The industrial production methods of soda sulfide (sodium sulfide) mainly include coal powder reduction mirabilite method, gas reduction method, barium sulfate by-product sodium sulfide method and hydrogen sulfide method. Among them, the barium sulfate by-product sodium sulfide method is to use coal to reduce barium sulfate to produce barium sulfide, then add sodium sulfate solution for treatment to generate sodium sulfide and precipitate barium sulfate, separate by suction filtration, evaporate and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18C01G3/12C01D1/22B09B3/00
Inventor 谢善情
Owner NANTONG BOTAO CHEM