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Process for producing calcium sulfide with phosphogypsum or other gypsums

A technology of phosphogypsum and calcium sulfide, applied in the direction of magnesium/calcium/strontium/barium sulfide/polysulfide, etc., can solve the problems of high labor intensity of workers, reduced coal consumption in production, long production cycle, etc., and achieve strong production continuity. , the cost increase, the effect of low production cost

Inactive Publication Date: 2010-12-22
GUIZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is the development of the inventor's invention patent application "a new method for producing calcium sulfide with phosphogypsum" application number 200710077608.4, both retaining the invention in the production process so that CaSO is reduced to CaS The reduction rate reaches more than 97% Compared with the prior art, the reduction rate is greatly improved, while the production coal consumption is greatly reduced, and the advantages of high-quality CaS content are also overcome. At the same time, the invention also overcomes the long production cycle, relatively high production costs, high labor intensity of workers, and the reduction CaS has the disadvantage that some of it may be oxidized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Raw material 1: Phosphogypsum

[0023] The composition of phosphogypsum is shown in the table below

[0024] components

SiO 2

Fe 2 o 3

al 2 o 3

CaO

MgO

SO 3

P 2 o 5

F

Loss on ignition

total

content%

5.32

0.32

0.75

30.5

0.27

44.02

0.55

0.15

18.30

100.18

[0025] The collection point is Guizhou Xiyang Fertilizer Co., Ltd.

[0026] Raw material 2: raw coal

[0027] The carbon content of the raw coal is 62%, the ash content is 20%, and the collection point is Jinsha County, Guizhou Province.

Embodiment approach

[0029] Phosphogypsum and raw coal are mixed according to the mass ratio of 1:0.20 and the molar ratio of 1:2.3. After mixing evenly, use a ball mill to grind to 120 mesh. Reduction roasting in the kiln, the high temperature zone of the rotary kiln is kept at 1100°C, the total residence time of the material blocks in the high temperature zone is 1 hour, and the O in the kiln tail gas is controlled. 2 The volume percent concentration is 0.8%.

[0030] The clinker block obtained after sintering is the finished product of coarse calcium sulfide.

[0031] Implementation results:

[0032] The composition of the sintered clinker is analyzed as follows:

[0033] components

[0034] CaSO 4 The conversion rate to CaS was 99.5%.

Embodiment 2

[0036] Raw material 1: Phosphogypsum

[0037] The composition of phosphogypsum is shown in the table below

[0038] components

[0039] The collection point is Guizhou Xiyang Fertilizer Co., Ltd.

[0040] Raw material 2: raw coal

[0041] The carbon content of the raw coal is 62%, the ash content is 20%, and the collection point is Jinsha County, Guizhou Province.

[0042] method of execution:

[0043] Phosphogypsum and raw coal are mixed according to the molar ratio of 1:0.25 and 1:2.9. After mixing evenly, use a ball mill to grind to 120 mesh, add water to make φ10-30mm balls, and put the balls in the rotary kiln after pre-drying For reduction roasting, the high temperature zone of the rotary kiln is kept at 1100°C, the total residence time of the block in the high temperature zone is 1 hour, and the O in the kiln exhaust gas is controlled. 2 The volume percent concentration is 0.8%. The clinker block obtained after sintering is the finished product of coarse ...

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PUM

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Abstract

The invention relates to a process for producing calcium sulfide by using phosphogypsum or other lime plaster. The process comprises the following steps: after the lime plaster and coal are mixed and ground according the mol ratio of 1:2-4, water is added to the mixture to be produced into pellets or block materials; then the pellets or the block materials are calcined in a rotary kiln at the temperature of 800 to 1100 DEG C for 0.5 to 1.5 hours; and the pellets or the block materials are sieved to obtain a calcium sulfide product. The method has the characteristics that the conversion rate of reducing the calcium sulphate in the lime plaster to the calcium sulfide is high and can reach more than 95 percent, the content of the calcium sulfide in the product is high, the coal consumption is low, the production process is easy to control.

Description

Technical field: [0001] The invention relates to a production process for producing calcium sulfide by using phosphogypsum or other gypsum, and belongs to the technical fields of environmental protection management and chemical production. Background technique: [0002] Phosphogypsum is the waste residue discharged from the industrial production of wet process phosphoric acid and phosphate fertilizer. The production of one ton of phosphoric acid will produce about five tons of phosphogypsum waste residue. The production of phosphate fertilizer in my country will discharge tens of millions of tons of phosphogypsum every year. Such a huge waste residue requires a lot of land piled up, causing serious pollution to the environment. The present invention uses phosphogypsum waste slag as a raw material for producing calcium sulfide to realize recycling of resources. Calcium sulfide is a useful chemical intermediate product, which can be used as a raw material for the production of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/44
Inventor 朱云勤张西兴马武权庞世花李树军
Owner GUIZHOU UNIV
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