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Method for absorbing hot galvanizing acid mist and co-producing calcium chloride

A technology of hot-dip galvanizing and calcium chloride, applied in the field of comprehensive utilization of resources, can solve problems such as corrosion of plant equipment, pollution of plant environment, acid mist pollution, etc., and achieve comprehensive utilization of resources, high acid mist absorption rate and simple process. Effect

Inactive Publication Date: 2020-09-01
HAIXI HUAHUI CHEM MASCH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the air quality in the hot-dip galvanizing workshop has serious problems, and the pollutants discharged in the process affect people's production and life, which has aroused widespread concern in the society
Among them, the acid mist pollution of the large pickling tank is particularly serious, which directly affects the health of employees, corrodes plant equipment and pollutes the plant environment
[0003] The existing acid mist absorption technology is carried out by acid mist collection and spraying treatment, but the waste liquid after spraying and absorption is not used, and many of them are directly discharged, causing environmental pollution and waste of resources

Method used

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  • Method for absorbing hot galvanizing acid mist and co-producing calcium chloride

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Collect hot-dip galvanizing acid mist from the hot-dip galvanizing pool (the content of HCl is 10mg / m 3 ), the hot-dip galvanizing acid mist is introduced into the spray tower through the pipeline by an induced draft fan, and then a calcium-based circulating lye (lime milk supernatant obtained by mixing quicklime and water with a pH value of 12) is used in the spray tower Perform spray absorption to obtain a calcium chloride solution; collect the obtained calcium chloride solution in a collection tank and perform evaporation and concentration to make the mass fraction of the calcium chloride solution 45%, and then perform pressure filtration to obtain a refined calcium chloride solution. After cooling and crystallization (0°C), a calcium chloride hexahydrate product is obtained with a purity of 98.5% and an acid mist absorption rate of 95.4%.

Embodiment 2

[0037] Collect hot-dip galvanizing acid mist from the hot-dip galvanizing pool (the content of HCl is 20mg / m 3 ), the hot-dip galvanizing acid mist is introduced into the spray tower through the pipeline by an induced draft fan, and then a calcium-based circulating lye (the supernatant obtained by mixing calcium carbide slag and water with a pH value of 12.5) is used in the spray tower Spray absorption to obtain calcium chloride solution; collect the obtained calcium chloride solution in the collection tank, evaporate and concentrate, so that the mass fraction of calcium chloride solution is 50%, and then press filter to obtain refined calcium chloride solution. Perform cooling crystallization (10°C) to obtain calcium chloride hexahydrate product with a purity of 98.5% and an acid mist absorption rate of 96.1%.

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Abstract

The invention provides a method for absorbing hot galvanizing acid mist and co-producing calcium chloride, and belongs to the technical field of comprehensive utilization of resources. The method comprises the following steps that calcium-based circulating alkali liquor is mixed with hot galvanizing acid mist in a spraying mode, and spraying absorption is conducted to obtain a calcium chloride solution; and evaporation concentration, filter pressing and cooling crystallization are sequentially carried out on the calcium chloride solution to obtain calcium chloride. According to the method, while the hot galvanizing acid mist is absorbed, the obtained absorption liquid (calcium chloride solution) is prepared into a calcium chloride product, so that the pollution of the hot galvanizing acidmist to the environment can be eliminated or reduced, the calcium chloride can be co-produced, the process is simple, the energy consumption is low, the cost is low, and the comprehensive utilizationof resources can be realized. According to the method, the acid mist absorption rate is high (can reach 96.1%), and the purity of the obtained calcium chloride product is high (can reach 98.5%).

Description

Technical field [0001] The invention relates to the technical field of comprehensive utilization of resources, in particular to a method for co-producing calcium chloride by absorbing hot-dip galvanizing acid mist. Background technique [0002] With the rapid economic development, especially the great industrial development, the demand for hot-dip galvanized steel is increasing, and the hot-dip galvanizing industry is extremely hot. However, the air quality in the hot-dip galvanizing workshop is very problematic, and the pollutants discharged in the process affect people's production and life, which has caused widespread concern in the society. Among them, the acid mist pollution of the large pickling tank is particularly serious, directly affecting the health of employees, corroding plant equipment and polluting the plant environment. [0003] Existing acid mist absorption technologies are all carried out by means of acid mist collection and spray treatment, but the waste liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/24C01F11/28C01F11/30
CPCC01F11/24C01F11/28C01F11/30C01P2006/80
Inventor 魏明金红祥洪剑波张方金张文栋刘岩王世强李积升
Owner HAIXI HUAHUI CHEM MASCH CO LTD
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