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Method for preparing calcium sulphide by decomposing phosphogypsum through hydrogen sulfide tail gas

A technology of tail gas decomposition and phosphogypsum, which is applied in the field of phosphogypsum resource utilization, to achieve the effects of reducing tail gas treatment, enhancing reducibility, and alleviating the shortage of sulfur resources

Inactive Publication Date: 2015-12-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in the prior art, H 2 An effective method for the comprehensive utilization of S tail gas and phosphogypsum, and directly uses H 2 S tail gas cannot effectively reduce phosphogypsum to calcium sulfide

Method used

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  • Method for preparing calcium sulphide by decomposing phosphogypsum through hydrogen sulfide tail gas
  • Method for preparing calcium sulphide by decomposing phosphogypsum through hydrogen sulfide tail gas
  • Method for preparing calcium sulphide by decomposing phosphogypsum through hydrogen sulfide tail gas

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Embodiment 1

[0022] The method for preparing calcium sulfide by decomposing phosphogypsum with hydrogen sulfide tail gas described in this example uses CO and H 2 S tail gas is a reducing atmosphere; the percentage of CO in it is 99.9%, H 2 H in S exhaust gas 2 The percentage of S is 10%, the gas flow rate of CO is 8ml / min, and the gas flow rate of H 2 The gas flow rate of the S tail gas is 72ml / min; it specifically includes the following steps:

[0023] (1) Phosphogypsum is naturally air-dried, crushed, ground, and sieved to obtain phosphogypsum powder with a particle size of 100 mesh;

[0024] (2) Place the phosphogypsum powder in a tube furnace for reduction and decomposition, and introduce CO and H 2 The mixed gas of S tail gas is used as the reducing agent, the furnace temperature is controlled at 800°C, and the SO in the furnace gas is continuously detected online with a flue gas analyzer. 2 volume percentage, SO 2 The volume percentage is 5%-8%, until the reaction is complete (...

Embodiment 2

[0034] The method for preparing calcium sulfide by decomposing phosphogypsum with hydrogen sulfide tail gas described in this example uses CO and H 2 S tail gas is a reducing atmosphere; the percentage of CO in it is 99.9%, H 2 H in S exhaust gas 2 The percentage content of S is 15%,

[0035] Where the gas flow rate of CO is 9ml / min, H 2 The gas flow rate of the S tail gas is 81ml / min; it specifically includes the following steps:

[0036] (1) Phosphogypsum is naturally air-dried, crushed, ground, and sieved to obtain phosphogypsum powder with a particle size of 110 mesh;

[0037] (2) Place the phosphogypsum powder in a tube furnace for reduction and decomposition, and introduce CO and H 2 The mixed gas of S tail gas is used as the reducing agent, the furnace temperature is controlled at 900°C, and the SO in the furnace gas is continuously detected online with a flue gas analyzer. 2 volume percentage, SO 2 The volume percentage is 8%-10%, until the reaction is complete (...

Embodiment 3

[0047] The method for preparing calcium sulfide by decomposing phosphogypsum with hydrogen sulfide tail gas described in this example uses CO and H 2 S tail gas is a reducing atmosphere; the percentage of CO in it is 99.9%, H 2 H in S exhaust gas 2 The percentage content of S is 15%,

[0048] Where the gas flow rate of CO is 10ml / min, H 2 The gas flow rate of the S tail gas is 90ml / min; it specifically includes the following steps:

[0049] (1) Phosphogypsum is naturally air-dried, crushed, ground, and sieved to obtain phosphogypsum powder with a particle size of 120 mesh;

[0050] (2) Place the phosphogypsum powder in a tube furnace for reduction and decomposition, and introduce CO and H 2 The mixed gas of S tail gas is used as the reducing agent, the furnace temperature is controlled at 950°C, and the SO in the furnace gas is continuously detected online with a flue gas analyzer. 2 volume percentage, SO 2 The volume percentage is 9%-11%, until the reaction is complete ...

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Abstract

The invention discloses a method for preparing calcium sulphide by decomposing phosphogypsum through hydrogen sulfide tail gas, and belongs to the field of phosphogypsum resource utilization. The phosphogypsum is dried and ground so that the phosphogypsum can be reduced and decomposed under Co and H2S tail gas to prepare CaS, decomposing temperature is 700-950 DEG C, the decomposing rate of the phosphogypsum is larger than and equal to 95%, and the productivity of calcium sulfide can reach over 85%. The production process is simple and easy to implement, the raw material is a large amount of the solid waste phosphogypsum, the prepared calcium sulfide can be used for preparing thiourea, sodium sulfide, sulphur, sulfuric acid and other chemical products and can also be used in the industries such as environmental protection and heavy metal treatment, and a new concept is provided for comprehensive utilization of the phosphogypsum.

Description

technical field [0001] The invention discloses a method for preparing calcium sulfide by decomposing phosphogypsum with hydrogen sulfide tail gas, and belongs to the technical field of phosphorus chemical treatment, that is, the field of phosphogypsum resource utilization. Background technique [0002] Phosphogypsum is an industrial solid waste produced during the production of phosphoric acid, and its main component is CaSO 4 2H 2 O. With the rapid development of phosphorus chemical industry, the production of phosphogypsum has increased sharply, and about 5 tons of phosphogypsum are emitted for every 1 ton of phosphoric acid produced. The annual emission of phosphogypsum in the world is more than 150 million tons, and the domestic annual emission of phosphogypsum is close to 50 million tons. t, Yunnan Province alone has reached 10 million t / a. As the world's largest producer of phosphate fertilizer, China is also the largest by-product of phosphogypsum. In the productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/44
Inventor 马丽萍连艳朱斌马贵鹏郑大龙杨杰王荣谋
Owner KUNMING UNIV OF SCI & TECH
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