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Treating and recovering process for waste acid

A technology for waste acid treatment and technology, applied in the direction of iron oxide/iron hydroxide, iron oxide, etc., can solve the problems of water or soil acidification, waste of resources, ecological environment hazards, etc., and achieve the effect of being conducive to ecological protection and saving costs.

Inactive Publication Date: 2017-03-15
FOSHAN JINXI JINLAN COLD ROLLED SHEET
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  • Abstract
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Problems solved by technology

Sulfuric acid is widely used in chemical industry, iron and steel and other industries. If sulfuric acid and other industrial waste water after production are discharged into the environment without treatment, it will not only acidify the water body or soil, cause harm to the ecological environment, but also waste a lot of resources, so , the treatment of waste acid has attracted the attention of many countries, and they have formulated strict discharge standards and vigorously developed advanced treatment technologies for waste acid. Therefore, it is quite important to develop a technology that can recycle waste acid. urgent

Method used

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Embodiment 1

[0021] The invention provides a waste acid treatment and recovery technology, comprising the following steps:

[0022] (1) First, the waste acid produced by pickling is quantitatively transported to the waste acid tank through the pipeline for precipitation, so that the impurities are separated to the bottom of the waste acid tank. The purpose is to precipitate the relatively large solid mixture;

[0023] (2) Then, the precipitated waste acid is introduced into the roasting furnace, heated by electric furnace wire, and the roasting furnace is heated at a temperature of 500 ° C, and the Fe 2 o 3 The solid particles will fall into the lower cone of the roasting furnace in the form of powder, and a rotary valve is set on the cone for the Fe 2 o 3 The solid particles are discharged, and when heated, the FeCl contained in the spent acid 2 and FeCL 3 will be decomposed according to the following equation:

[0024] 4FeCL 2 +4H 2 O+O 2 =2Fe 2 o 3 +8HCL

[0025] 2FeCL 3 +3H...

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Abstract

The invention provides a treating and recovering process for waste acid, belonging to the technical field of treatment of waste liquid. The treating and recovering process comprises the following process steps: precipitation of waste acid; roasting in a roasting furnace; separation of roasting gas and impurities thereof; rinsing with an absorbing tower; reseparation of the roasting gas; washing of exhaust gas; etc. According to the step of washing of exhaust gas, before eventual discharging of gas, rinsing water is used for cyclically washing exhaust gas at the lower part of the washing tower and desalinized water is used for cyclically washing the exhaust gas at the upper part of the washing tower, so the exhaust gas is allowed to reach emission standards. The treating and recovering process has the beneficial effects that waste acid can be decomposed into Fe2O3 solid particles and recovered acid and the recovered acid can be returned to a pickling line for repeated usage, so cost is saved and the concept of eco-environment protection is accorded with.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, in particular to a waste acid treatment and recovery technology. Background technique [0002] When concentrated sulfuric acid is used as the sulfonating agent, every time a sulfonic group is introduced, 1 mol of water will be generated. As the sulfonation reaction proceeds, the concentration of sulfuric acid will gradually decrease. For the specific sulfonation process, when the concentration of sulfuric acid is reduced to a certain level, The rate of the sulfonation reaction almost slows to a halt, and it becomes spent acid. Heavy industry is the main source of hazardous waste in my country, and the output of waste acid ranks among the top three in the amount of industrial hazardous waste, accounting for 21%, and is dominated by inorganic acids such as hydrochloric acid, sulfuric acid, and nitric acid. Taking waste sulfuric acid as an example, it mainly comes from the production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
CPCC01G49/06
Inventor 郭坚周平姚九根
Owner FOSHAN JINXI JINLAN COLD ROLLED SHEET
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