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Method for preparing industrial sulfuric acid from sulfur-containing waste liquid

A technology for industrial sulfuric acid and waste liquid, applied in chemical instruments and methods, sulfur compounds, ammonia compounds, etc., can solve secondary pollution and other problems, achieve the effects of preventing secondary pollution, improving efficiency, and compact device layout

Pending Publication Date: 2020-04-28
山东绿知源环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there is no relevant literature documenting how to prevent secondary pollution in the drying process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing industrial sulfuric acid from sulfur-containing waste liquid, comprising the following steps:

[0028] S1 collects the sulfur-containing waste liquid and sends it to the precision filtration concentration unit through the pipeline, and uses a filter press to filter to obtain the first sulfur slurry containing elemental sulfur and the filtered clear liquid. The elemental sulfur is intercepted, and the moisture content of the sulfur paste is controlled at Below 35%;

[0029] S2 introduces the filtered clear liquid in step S1 into the evaporation concentration unit, and uses a multi-effect evaporator to concentrate the filtered clear liquid into a second sulfur slurry whose moisture content is controlled at 50%;

[0030] S3 mixes the first sulfur slurry obtained in step S1 and the second sulfur slurry obtained in step S2 to form a thick slurry and enters the drying unit through a pipeline, inert gas is used as a drying medium, and the drying method i...

Embodiment 2

[0042] A kind of method utilizing sulfur-containing waste liquid to prepare industrial sulfuric acid comprises the following steps:

[0043]S1 collects the sulfur-containing waste liquid and sends it to the precision filtration concentration unit through the pipeline, and uses a filter press to filter to obtain the first sulfur slurry containing elemental sulfur and the filtered clear liquid. The elemental sulfur is intercepted, and the moisture content of the sulfur paste is controlled at Below 35%;

[0044] S2 introduces the filtrate clear liquid described in step S1 into the evaporation concentration unit, and uses a multi-effect evaporator to concentrate the filtrate clear liquid into a second sulfur slurry whose moisture content is controlled at 55%;

[0045] S3 mixes the first sulfur slurry obtained in step S1 and the second sulfur slurry obtained in step S2 to form a thick slurry and enters the drying unit through a pipeline, inert gas is used as a drying medium, and th...

Embodiment 3

[0057] A method for preparing industrial sulfuric acid from sulfur-containing waste liquid, comprising the following steps:

[0058] S1 collects the sulfur-containing waste liquid and sends it to the precision filtration concentration unit through the pipeline, and uses a filter press to filter to obtain the first sulfur slurry containing elemental sulfur and the filtered clear liquid. The elemental sulfur is intercepted, and the moisture content of the sulfur paste is controlled at Below 35%;

[0059] S2 introduces the filtrated clear liquid described in step S1 into the evaporation concentration unit, and uses a multi-effect evaporator to concentrate the filtrated clear liquid into a second sulfur slurry whose moisture content is controlled at 52%;

[0060] S3 mixes the first sulfur slurry obtained in step S1 and the second sulfur slurry obtained in step S2 to form a thick slurry and enters the drying unit through a pipeline, inert gas is used as a drying medium, and the dry...

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Abstract

The invention provides a method for preparing industrial sulfuric acid by using sulfur-containing waste liquid, and belongs to the field of industrial wastewater treatment. The method comprises the following steps: mixing sulfur-containing waste liquid generated by ammonia process (HPF process) gas desulfurization, and filtering elemental sulfur by using a filter press to obtain first sulfur slurry and filtered clear liquid; evaporating and concentrating the filtered desulfurization clear liquid into second sulfur slurry, mixing the first sulfur slurry and the second sulfur slurry of the sulfur slurry into thick slurry, and sending the thick slurry to a drying section; and in the drying section, taking inert gas as a medium in a closed circulating drying mode, and treating thick sulfur slurry to obtain crude sulfur powder. The crude sulfur is fed into a sulfur burning furnace, and the crude sulfur and oxygen-enriched air are burnt into SO2 flue gas, through temperature reduction and dehumidification of the purification process and the dehydration and a drying tower and through two-turn and two-absorption acid manufacturing process, the sulfuric acid product is made, and the environmental protection problem in the drying process is mainly solved, and the ultra-low emission problem of tail gas is solved through energy conservation and emission reduction measures and process control of pretreatment and oxygen-enriched combustion.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a method for preparing industrial sulfuric acid from sulfur-containing waste liquid. Background technique [0002] The desulfurization waste liquid produced by HPF and PDS desulfurization in the coking plant and the production of sulfuric acid from sulfur foam are the best production technology to solve the environmental protection problems of desulfurization waste liquid. In the production process of dry sulfuric acid, desulfurization waste liquid and sulfur foam are processed into solid crude sulfur by drying, and then burned to produce sulfuric acid. There are secondary environmental protection problems in the drying process in the production process, mainly manifested in the dust and odor of the on-site environment, the safety of the drying process, exhaust emissions, etc., energy-saving measures need to be optimized, and ultra-low exhaust emissions....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74C01C1/242
CPCC01B17/74C01C1/242
Inventor 王玉衡宋伯苍孟昭颂
Owner 山东绿知源环保工程有限公司
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