Method for producing liquid sulfur dioxide by using gypsum (CaSO4)

A liquid sulfur dioxide and sulfur dioxide technology, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve the problems of difficulty in participating in market competition, loss of economic value of products, low concentration of raw material gas, etc. High reaction efficiency and the effect of reducing side reactions

Active Publication Date: 2014-05-21
CHONGQING SANSHENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using various types of gypsum to produce liquid sulfur dioxide and other sulfur-containing products, due to the SO produced from various types of gypsum 2 The raw material gas concentration is too low, so that the production of liquid sulfur dioxide and other products loses its economic value and is difficult to participate in market competition. Therefore, it has been difficult to realize the industrial production of liquid sulfur dioxide with cheap gypsum as raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for producing liquid sulfur dioxide from gypsum, carried out in the following steps:

[0028]1. Raw material equipment: 85% gypsum, 6% coke, 3% yellow sand, 4% shale, and 2% iron powder are used as raw materials by mass percentage, and the gypsum is CaSO 4 Gypsum and coke with a content of ≥85% are cokes containing fixed carbon ≥75%. The sieve residue of gypsum with a particle size of 0.08㎜ is 18%, and the sieve residue of coke with a particle size of 0.2㎜<20%; the ratio of each material is determined by the metering belt scale To achieve this, the addition of raw material is added with a metering screw, so that the feeding is uniform and smooth, no material breakage occurs, the metering is accurate, and the adjustment is free;

[0029] 2. Calcination reaction in the rotary kiln: Add the raw material prepared above into the rotary kiln for calcination, and control the kiln speed of the rotary kiln at 1.5 rpm; The gun enters to ensure that the coal powder enter...

Embodiment 2

[0059] A method for producing liquid sulfur dioxide from gypsum, carried out in the following steps:

[0060] 1. Raw material equipment: 83% gypsum, 8% coke, 5% yellow sand, 2% shale, and 2% iron powder are used as raw materials by mass percentage, and the gypsum is CaSO 4 Gypsum and coke with a content of ≥85% are cokes with a fixed carbon content of ≥75%. The sieve residue of gypsum with a particle size of 0.08mm is 15%, and the sieve residue of coke with a particle size of 0.2mm is less than 20%. To achieve this, the addition of raw material is added with a metering screw, so that the feeding is uniform and smooth, no material breakage occurs, the metering is accurate, and the adjustment is free;

[0061] 2. Calcination reaction in the rotary kiln: add the raw material prepared above into the rotary kiln for calcination, control the kiln speed of the rotary kiln at 2.5 rpm; The gun enters to ensure that the coal powder enters the kiln evenly and burns. The primary air volu...

Embodiment 3

[0068] A method for producing liquid sulfur dioxide from gypsum, carried out in the following steps:

[0069] 1. Raw materials: 88% gypsum, 4% coke, 3% yellow sand, 4% shale, and 1% iron powder are used as raw materials by mass percentage, and the gypsum is CaSO 4 Gypsum and coke with content ≥ 85% are coke with fixed carbon ≥ 75%, gypsum particle size is 0.08㎜ sieve residue is 20%, coke particle size is 0.2㎜ sieve residue < 20%; the ratio of each material is measured by belt scale To achieve this, the addition of raw material is added with a metering screw, so that the feeding is uniform and smooth, no material breakage occurs, the metering is accurate, and the adjustment is free;

[0070] 2. Calcination reaction in the rotary kiln: add the raw material prepared above into the rotary kiln for calcination, control the kiln speed of the rotary kiln at 2.0 rpm; The gun enters to ensure that the coal powder enters the kiln evenly and burns. The primary air volume accounts for 40...

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PUM

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Abstract

The invention relates to a method for producing liquid sulfur dioxide by using gypsum (CaSO4). Gas sulfur dioxide is firstly prepared by using the gypsum and coke as main raw materials, purified gas sulfur dioxide is then absorbed by using a sodium citrate lean solution, sulfur dioxide in the sodium citrate lean solution can be increased to obtain a sodium citrate pregnant solution, the sodium citrate pregnant solution is then subjected to heating, air stripping and resolution to produce saturated-steam-containing sulfur dioxide gas and a sodium citrate lean solution, and the liquid sulfur dioxide is obtained after the saturated-steam-containing sulfur dioxide gas is subjected to cooling, drying, compression and condensation; and the raw materials are subjected to calcination reaction in a rotary kiln during the process of the preparation of the gas sulfur dioxide, wherein the O2 content of the tail gas of the rotary kiln is controlled to be 0.05%-1.0%, and the CO content is controlled to be less than 0.4%, in terms of mass percentage. According to the method for producing the liquid sulfur dioxide by using the gypsum (CaSO4), provided by the invention, the decomposition reaction efficiency of the CaSO4 is high, and the sulfur loss is little; and the mass concentration of the obtained sulfur dioxide gas reaches 10%-13%, the liquid sulfur dioxide is prepared from the sulfur dioxide gas by adopting a sodium citrate method, and the sodium citrate solution is nontoxic and is difficult to burn, so that the production operation is safe.

Description

technical field [0001] The present invention relates to a kind of utilizing gypsum to produce liquid SO 2 The production method belongs to the field of comprehensive utilization of chemical technology and industrial solid waste resources. Background technique [0002] conventional liquid SO 2 The production method is to use sulfur incineration or use pyrite as raw material to produce SO 2 Gas, and then use ammonium acid method, pure oxygen combustion method, sodium citrate method to prepare liquid SO 2 ; and my country's sulfur and pyrite resources are scarce, and a large amount of imports are needed to meet the needs of sulfuric acid and liquid SO 2 production. my country's natural gypsum and various chemical gypsum (phosphogypsum, desulfurization gypsum, etc.) resources are very rich, especially the accumulation of chemical gypsum, which not only takes up a lot of land but also pollutes the environment, actively develops and utilizes gypsum to produce liquid sulfur dio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/50
Inventor 杨兴志潘先文
Owner CHONGQING SANSHENG IND CO LTD
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