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Method for preparing calcium oxide and sulfur from gypsum and system device

A system device, calcium oxide technology, applied in chemical instruments and methods, calcium/strontium/barium oxide/hydroxide, inorganic chemistry, etc., can solve problems such as gypsum environmental pollution

Active Publication Date: 2017-05-31
JIANGSU DEYITONG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problem of environmental pollution caused by a large amount of gypsum accumulation, and to provide a process that can realize low-cost production of calcium oxide and sulfur from gypsum, and the process is safe and reliable, and there is no discharge of waste water and waste residue , environmentally friendly

Method used

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  • Method for preparing calcium oxide and sulfur from gypsum and system device
  • Method for preparing calcium oxide and sulfur from gypsum and system device
  • Method for preparing calcium oxide and sulfur from gypsum and system device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The gypsum raw material is desulfurized gypsum from somewhere, and its main components are as follows:

[0062] composition SiO 2

Al 2 o 3

Fe 2 o 3

CaO MgO Na 2 o

K 2 o

SO 3

crystal water other content% 1.93 0.49 0.21 31.45 0.65 0.06 0.15 45.23 18.26 1.57

[0063] The method of producing calcium oxide and sulfur from gypsum is to contact and react gypsum with sulfur-containing process gas at high temperature to obtain calcium oxide and sulfur dioxide, and then react sulfur dioxide with a carbonaceous reducing agent to produce sulfur, such as figure 1 As shown, it specifically includes the following steps:

[0064] (1) Gypsum pretreatment: remove impurities first and then dry and dehydrate the dihydrate gypsum. The drying temperature is 90°C and the drying time is 8 hours. The total water content of the dehydrated gypsum after drying and dehydration is 2-8%. Grinding device to produce dehydrate...

Embodiment 2

[0069] The gypsum raw material is desulfurized gypsum from somewhere, and its main components are as follows:

[0070] composition SiO 2

al 2 o 3

Fe 2 o 3

CaO MgO Na 2 o

K 2 o

SO 3

crystal water other content% 1.93 0.49 0.21 31.45 0.65 0.06 0.15 45.23 18.26 1.57

[0071] The method for preparing calcium oxide and sulfur from gypsum is to contact and react gypsum with sulfur-containing process gas at high temperature to obtain calcium oxide and sulfur dioxide, and then react sulfur dioxide with a carbonaceous reducing agent to prepare sulfur, which specifically includes the following steps:

[0072] (1) Gypsum pretreatment: remove impurities first and then dry and dehydrate the dihydrate gypsum. The drying temperature is 150°C and the drying time is 5 hours. The total water content of the dehydrated gypsum after drying and dehydration is 2-10%. device to produce dehydrated gypsum powder with an average...

Embodiment 3

[0077] The gypsum raw material is desulfurized gypsum from somewhere, and its main components are as follows:

[0078] composition SiO 2

al 2 o 3

Fe 2 o 3

CaO MgO Na 2 o

K 2 o

SO 3

crystal water other content% 1.93 0.49 0.21 31.45 0.65 0.06 0.15 45.23 18.26 1.57

[0079] The method for preparing calcium oxide and sulfur from gypsum is to contact and react gypsum with sulfur-containing process gas at high temperature to obtain calcium oxide and sulfur dioxide, and then react sulfur dioxide with a carbonaceous reducing agent to prepare sulfur, which specifically includes the following steps:

[0080] (1) Gypsum pretreatment: remove impurities first and then dry and dehydrate the dihydrate gypsum. The drying temperature is 200°C and the drying time is 2 hours. The total water content of the dehydrated gypsum after drying and dehydration is 2-10%. device to produce dehydrated gypsum powder with an average...

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Abstract

The invention relates to a method for preparing calcium oxide and sulfur from gypsum. The method comprises the following steps: (1) pretreating gypsum: drying dihydrate gypsum to form a dehydrated gypsum with the total water content of 2-10%, grinding the dehydrated gypsum into a gypsum powder; (2) decomposing the gypsum: enabling the gypsum powder in the step (1) to be in contact with a sulfur-containing process gas, reacting at the temperature of 700-1200 DEG C, and finally generating calcium oxide and a sulfur dioxide gas; (3) reducing the sulfur dioxide: enabling the prepared sulfur dioxide gas to be in contact with a carbonaceous reducing agent, reacting at the temperature of 600-1000 DEG C, and generating a sulfur-containing process gas. The sulfur-containing process gas is divided into two strands, one is used for the decomposition reaction of the gypsum in the step (2), and the other is used for producing sulfur through the processes of condensation, catalytic reaction, pelleting and the like. The conversion rate of the gypsum is high, the gypsum is consumed to produce the high value added calcium oxide and sulfur, the source of raw materials is wide, the energy consumption is low, and excellent environmental protection benefit and economic benefit are achieved.

Description

technical field [0001] The invention relates to the technical field of solid pollutant treatment and chemical production, in particular to a method for preparing calcium oxide and sulfur from gypsum. Background technique [0002] At present, my country's flue gas desulfurization adopts the relatively mature and widely used limestone-gypsum wet desulfurization process. However, the sequela of this limestone-gypsum wet desulfurization process is that a large amount of desulfurized gypsum is piled up and decomposed to cause secondary pollution, which is harmful to the environment and human body. The comprehensive utilization rate of desulfurized gypsum is less than 80%, and the annual newly produced desulfurized gypsum exceeds 20 million tons. Desulfurized gypsum will become another major pollution source after sulfur dioxide and nitrogen oxides. [0003] In addition, the by-product gypsum in the production process of many chemical companies has long been plagued by problems, ...

Claims

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Application Information

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IPC IPC(8): C01F11/04C01B17/04
CPCC01B17/0482C01F11/04
Inventor 陈任远徐延忠刘大华李明波李军民
Owner JIANGSU DEYITONG ENVIRONMENTAL PROTECTION TECH CO LTD
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