Method for removing sulfur dioxide in sulfuric acid tail gas

A sulfuric acid tail gas and sulfur dioxide technology, applied in chemical instruments and methods, separation methods, solid separation, etc., can solve the problems of complicated treatment process, poor treatment effect, secondary pollution, etc., achieve low production cost, save consumption, and reduce production cost effect

Inactive Publication Date: 2015-06-03
KUNMING CHUAN JINNUO CHEM IND
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  • Abstract
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Problems solved by technology

[0002]At present, in the phosphorus chemical industry, enterprises that use wet-process phosphoric acid as an intermediate product generally adopt the "sulfur-phosphorus matching" method, that is, they have both phosphoric acid plants and Phosphorus chemical products are produced in the way of simultaneous operation of sulfuric acid plant and supporting equipment; in the process of sulfuric acid production, there will be waste gas containing a certain amount of sulfur dioxide gas; in the process of sulfuric acid production, the tail gas discharged from the second absorption tower The content of sulfur dioxide is generally about 800~2000 mg / m3; sulfur dioxide is one of the main pollutants in the atmosphere. It is not only toxic to the human body, but also causes acid rain. One of the pollutants that requires strict control of emissions; now the treatment of sulfuric acid tail gas is generally treated by lime method, calcium carbonate method, ammonia method or sodium method, or directly discharged; therefore, the treatment process is complicated and the treatment effect is poor; The sulfite washing slurry of calcium, sodium, ammonia, etc. has not been fully utilized, and some are even discarded directly as waste residue, thus causing secondary pollution; at the same time, in the production process of wet-process phosphoric acid, there is generally a phosphate rock reverse flotation detachment For the magnesium oxide removal device, before reverse flotation, a certain amount of inorganic acid such as sulfuric acid or phosphoric acid needs to be added as a conditioning agent to adjust the pH value of the phosphate slurry to 4.0~5.0; 10-25 kg of sulfuric acid, phosphoric acid and other inorganic acids, the reverse flotation production cost of phosphate rock needs to increase by 4.00-10.00 yuan

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  • Method for removing sulfur dioxide in sulfuric acid tail gas

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment example 1

[0026] 1. Pump the phosphate rock slurry with a solid content of 25% to the secondary tail gas scrubber, and circulate and wash in the sulfuric acid tail gas scrubber through the slurry circulation pump to absorb sulfur dioxide in the tail gas. The temperature of the circulating slurry is 25°C; It is transported to the first-stage tail gas scrubber during the slurry replacement of the first-stage scrubber;

[0027] 2. When the first-level tail gas scrubber absorbs the slurry index and discharges it out of the system, the second-level circulating slurry is transported to the first-level tail gas absorption tower, and through the slurry circulation pump, it is circulated and washed in the sulfuric acid tail gas scrubber to absorb sulfuric acid. Sulfur dioxide in the tail gas, the circulating slurry temperature is 25°C;

[0028] 3. When the pH value of the phosphate rock pulp absorbed by the first stage is reduced to 4.2, replace it with the phosphate rock pulp absorbed by the se...

specific Embodiment example 2

[0032] 1. Use the phosphate rock slurry with a solid content of 35% as a pump to transport it to the secondary tail gas scrubber, and circulate and wash in the sulfuric acid tail gas scrubber through the slurry circulation pump to absorb sulfur dioxide in the tail gas. The temperature of the circulating slurry is 32°C; It is transported to the first-stage tail gas scrubber during the slurry replacement of the first-stage scrubber;

[0033] 2. When the index of the primary absorption slurry is qualified and discharged from the system, the secondary circulating slurry is transported to the primary tail gas absorption tower, and is circulated and washed in the sulfuric acid tail gas scrubber through the slurry circulation pump to absorb the exhaust gas from the sulfuric acid tail gas. Sulfur dioxide, circulating slurry temperature 32°C;

[0034] 3. When the pH value of the phosphate rock pulp absorbed by the first stage is reduced to 4.5, it is replaced with the phosphate rock pu...

specific Embodiment example 3

[0038] 1. Use the phosphate rock slurry with a solid content of 47% as the pump to the secondary tail gas scrubber, and circulate and wash in the sulfuric acid tail gas scrubber through the slurry circulation pump to absorb sulfur dioxide in the tail gas. The temperature of the circulating slurry is 38°C; It is transported to the first-stage tail gas scrubber during the slurry replacement of the first-stage scrubber;

[0039] 2. When the index of the primary absorption slurry is qualified and discharged from the system, the secondary circulating slurry is transported to the primary tail gas absorption tower, and is circulated and washed in the sulfuric acid tail gas scrubber through the slurry circulation pump to absorb the exhaust gas from the sulfuric acid tail gas. Sulfur dioxide, circulating slurry temperature 38°C;

[0040] 3. When the pH value of the phosphate rock pulp absorbed by the first stage is reduced to 4.7, replace it with the phosphate rock pulp absorbed by the...

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Abstract

The invention relates to a method for removing sulfur dioxide in sulfuric acid tail gas. The method comprises the following steps: (1) by using phosphoric ore pulp with the solid content of 20-60% as sulfuric acid tail gas, carrying out circulating scrubbing to the phosphoric ore pulp in a sulfuric acid tail gas scrubbing tower for absorbing sulfur dioxide in tail gas; and (2) absorbing sulfur dioxide in sulfuric acid tail gas at normal temperature by phosphoric ore pulp without heating or cooling, wherein most of sulphurous acid in absorption liquid is catalyzed-oxidized into sulfuric acid in an absorption process due to iron, manganese and other elements in phosphorite. The method has the remarkable effects that firstly, the production cost is low; secondly, the desulphurization effect is remarkable; thirdly, phosphorite flotation and sulphurous acid oxidization can be carried out in the same device by one step; and fourthly, the desulfuration operation is associated with the reverse flotation of the phosphorite, and wastes are turned into wealth.

Description

technical field [0001] The invention relates to a new method for treating tail gas in the production process of sulfuric acid, in particular to a raw material for removing sulfur dioxide in tail gas in the production process of sulfuric acid with phosphate rock slurry and using the desulfurized phosphate rock pulp for reverse flotation demagnesization process method. Background technique [0002] At present, in the phosphorus chemical industry, enterprises that use wet-process phosphoric acid as an intermediate product generally adopt the "sulfur-phosphorus matching" method, that is, they have both a phosphoric acid plant and a sulfuric acid plant, and the supporting plants operate simultaneously to process phosphorus chemical products. Production; in the process of sulfuric acid production, there will be waste gas containing a certain amount of sulfur dioxide gas; in the process of sulfuric acid production, the content of sulfur dioxide in the tail gas discharged from the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B03B1/00
Inventor 曾润国杨礼彬刘泽祥魏家贵刘甍冯发均
Owner KUNMING CHUAN JINNUO CHEM IND
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