Method for producing calcium sulphide with gypsum, sulfur-fixing agent and high-sulphur coal

A sulfur-fixing agent, high-sulfur coal technology, applied in the direction of magnesium/calcium/strontium/barium sulfide/polysulfide, etc., can solve the problems of poor economic benefit and high cost, achieve cost reduction, increase output, and easy production process control effect

Inactive Publication Date: 2008-11-12
YUNNAN CHEM RES INST
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

The above preparation methods all use traditional coal combustion as a reducing agent to reduce the CaSO in gypsum 4 Reverting to calcium sulfide products...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Raw material 1: Phosphogypsum

[0019] The main composition of phosphogypsum is shown in the table below:

[0020] components

[0021] Raw material 2: The content of calcium oxide is 93%

[0022] Raw material 3: high sulfur coal

[0023] Coal sample element analysis table%

[0024] C r

[0025] Mix high-sulfur coal and calcium oxide at a ratio of 1:0.08, and phosphogypsum and high-sulfur coal at a ratio of 1:0.21, add them to the circulating fluidized bed, keep the furnace temperature at 850-980°C, and keep the residence time for about 2 hours. After roasting, the finished product of coarse calcium sulfide is obtained. Calcium sulfide product conversion rate is 93.2%

Embodiment 2

[0027] Raw material 1: the phosphogypsum used is the same as in Example 1.

[0028] Raw material 2: The content of calcium carbonate is 96.3%.

[0029] Raw material 3: The coal sample elemental analysis of high-sulfur coal is the same as that in Example 1.

[0030] Mix high-sulfur coal and calcium carbonate at a ratio of 1:0.12, and phosphogypsum and high-sulfur coal at a ratio of 1:0.22, and send them into the rotary kiln. After roasting, the finished product of coarse calcium sulfide is obtained. The conversion rate of calcium sulfide product is 89.5%.

Embodiment 3

[0032] Raw material 1: the phosphogypsum used is the same as in Example 1.

[0033] Raw material 2: The content of calcium carbonate is 96.3%.

[0034] Raw material 3: The coal sample elemental analysis of high-sulfur coal is the same as that in Example 1.

[0035] Mix high-sulfur coal and calcium carbonate according to the molar ratio of fixed carbon in high-sulfur coal to calcium carbonate at a ratio of 1:3.5, and phosphogypsum and high-sulfur coal at a ratio of 1:0.24 and send them into the tunnel kiln to maintain the temperature in the high-temperature section 900-1150°C, the residence time is about 2 hours. After roasting, the finished product of coarse calcium sulfide is obtained. The conversion rate of calcium sulfide product is 91.3%.

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Abstract

The invention provides a method for manufacturing calcium sulfide with gypsum, sulfur-fixing agent and high-sulfur coal, relating to the chemical production technical field. The method comprises the following steps of: a. evenly mixing the gypsum, the sulfur-fixing agent and the high-sulfur coal according to the requirements that the mol ratio of total metallic ions in the sulfur-fixing agent to sulfur in the high-sufur coal is 0.8 to 3.5, and the proportion of the total calcium molar weight in the mixture to the carbon molar weight in the coal meets 1 to between 2 and 4; b. sending the mixture into a high-temperature roasting device for roasting the mixture to acquire a calcium sulfide product. The method not only increases the yield of the calcium sulfide product, but also provides an effective using way for the high-sulfur coal, so that the cost of the calcium sulfide product can be greatly reduced. The manufacturing method can ensure that the percent reduction of reducing CaSO4 in phosphogypsum or other gypsum materials to CaS reaches over 87 percent, can manufacture high-content CaS products, and has the advantages of easily controlled manufacturing process and easy realization of high and stable yield.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a production method for producing calcium sulfide by using high-sulfur coal and gypsum, and belongs to the technical fields of environmental protection and chemical production. Background technique [0002] The total amount of coal resources in my country ranks second in the world, and high-sulfur coal accounts for about 8% of the total resources. According to the current national coal resource forecast total and proven coal reserves, the total high-sulfur coal forecast and proven reserves are 4260 respectively. 100 million tons and 62 billion tons, the resources are quite abundant. Since there is no suitable treatment process and use method that meets the requirements of environmental protection, in order to meet the requirements of the "Tenth Five-Year Plan for the Prevention and Control of Acid Rain and Sulfur Dioxide Pollution in Two Controlled Areas", my country p...

Claims

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Application Information

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IPC IPC(8): C01B17/42
Inventor 王志刚
Owner YUNNAN CHEM RES INST
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