Method for producing sulfurated hydrogen and calcium salt with calcium sulphide

A calcium sulfide and hydrogen sulfide technology, applied in chemical instruments and methods, hydrogen sulfide, inorganic chemistry, etc., can solve the problems of discarding and stacking, difficult to use, etc., and achieve easy control of the production process, complete process flow, and high reaction conversion rate. Effect

Inactive Publication Date: 2009-02-25
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The calcium carbonate by-product of this method is discarded and piled up because it contains a large amount of impurities and is difficult to use.

Method used

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  • Method for producing sulfurated hydrogen and calcium salt with calcium sulphide
  • Method for producing sulfurated hydrogen and calcium salt with calcium sulphide
  • Method for producing sulfurated hydrogen and calcium salt with calcium sulphide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Raw material 1: Coarse calcium sulfide CaS = 52.3%; moisture ≤ 1%; particle size 25 mesh sieve residue ≤ 3%

[0021] Raw material 2: wet-process phosphoric acid after defluorination and desulfurization treatment

[0022] P 2 o 5 % CaO% Fe 2 o 3 % MgO% Al 2 o 3 % SO 3 % F％ 49.55 0.25 0.93 0.8 2.06 0.050 0.23

[0023] Add crude calcium sulfide to water, stir to form a suspension, and then lead to hydrogen sulfide reaction to obtain the intermediate product calcium hydrosulfide, which is separated by hydrocyclone to obtain calcium hydrosulfide clear liquid and slurry, and add the slurry to defluorinated wet-process phosphoric acid Medium reaction, the hydrogen sulfide gas is collected through the gas phase outlet, and after filtration and separation to remove slag, the clear liquid is reacted with the calcium hydrosulfide aqueous solution obtained by the previous hydrocyclone separation, and the hydrogen sulfide gas is collected...

Embodiment 2

[0026] Raw material is with embodiment 1.

[0027] Add crude calcium sulfide into water, stir to form a suspension, then pass through hydrogen sulfide to react to obtain intermediate product calcium hydrosulfide, and filter to obtain calcium hydrosulfide supernatant. Add the calcium hydrosulfide aqueous solution to the defluorinated wet-process phosphoric acid, and the hydrogen sulfide gas generated by the reaction is collected through the gas phase outlet; when the pH value of the solution reaches 2.8-3.2, the reaction is terminated. The solution is concentrated and crystallized to obtain a crude product of calcium dihydrogen phosphate, and then washed and dried to obtain a product of calcium dihydrogen phosphate. The obtained calcium dihydrogen phosphate meets the national feedstuff calcium dihydrogen phosphate product standard, and the product quality is as follows:

[0028] P Ca F Pb As 22.4 16.3 0.13 0.001 0.001

Embodiment 3

[0030] Raw material is with embodiment 1.

[0031] Add crude calcium sulfide to water, stir to form a suspension, and then introduce hydrogen sulfide to react to obtain intermediate product calcium hydrosulfide, which is separated by inclined plate settler to obtain calcium hydrosulfide clear liquid and slag slurry. The slurry reacts with defluorinated wet-process phosphoric acid, and the hydrogen sulfide gas generated is collected through the gas phase outlet. After filtration and separation to remove slag, the clear liquid is reacted with the calcium hydrosulfide aqueous solution obtained from the aforementioned sedimentation separation, and the generated hydrogen sulfide gas is collected through the gas phase outlet, and the pH value of the reaction end point is controlled to be 7.2-9.0. The crude tricalcium phosphate product is obtained by filtration, and then washed and dried to obtain the tricalcium phosphate product. The obtained tricalcium phosphate meets the national...

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Abstract

The invention relates to a method by adopting calcium sulfide to produce hydrogen sulphide and calcium salt and belongs to the technical field of environment protective treatment and chemical production, in particular to a method using calcium sulfide to react with acid or estolide to produce hydrogen sulphide and corresponding calcium salt; in the method, calcium sulfide reacts with acid or estolide to produce hydrogen sulphide and calcium salt; the method includes the following steps: a. coarse calcium sulfide is added into water to prepare calcium sulfide suspension; b. hydrogen sulphide gas is filled in the calcium sulfide suspension for reaction until the specific gravity of clear solution reaches 1.02-1.19, so as to obtain sulfur calcium hydroxide water solution; c. solid residue is removed by separation; d. after solid-liquid separation, the sulfur calcium hydroxide water solution or/and the residue is/are mixed with the acid or/and the estolide to prepare hydrogen sulphide and calcium salt; the method has the advantages of complete technological process, full utilization of calcium and sulfur resources, high reaction conversion rate and easy control of the production process.

Description

technical field [0001] The invention relates to the technical fields of environmental protection management and chemical production. In particular, it relates to a method for producing hydrogen sulfide and corresponding calcium salt by reacting calcium sulfide with acid or acid anhydride. Background technique [0002] my country is a country that is short of sulfur resources. It needs to import nearly 10 million tons of sulfur from abroad every year to meet the needs of phosphate compound fertilizer manufacturers and other industries. But at the same time, my country is rich in gypsum resources, especially a large amount of phosphogypsum discharged from industrial production of wet-process phosphoric acid and phosphate fertilizer, which reaches tens of millions of tons every year, causing serious pollution to the environment. The process of producing calcium sulfide through reduction reaction from gypsum, and then producing hydrogen sulfide from calcium sulfide, and then pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/16C01F11/00
Inventor 王志刚
Owner YUNNAN CHEM RES INST
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