Waste acid resource utilization process

A technology of resource utilization and process, which is applied in the field of resource utilization of waste acid, can solve the problems of total nitrogen exceeding the standard and high treatment cost, and achieve the effect of reducing treatment cost, improving economic benefits and realizing resource utilization

Active Publication Date: 2018-06-22
应韵进
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of the prior art that consume a large amount of lime and methanol, the processing cost is high, and the total nitrogen is easy to exceed the standard, the present invention provides a resource utilization process of waste acid

Method used

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  • Waste acid resource utilization process

Examples

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Effect test

Embodiment 1

[0031] A resource utilization process of waste acid, such as figure 1 shown, including the following steps:

[0032] (1) Add the waste liquid produced by the electronics industry into the first reactor, then add the precipitating agent, add the filter to filter after fully stirring the reaction, obtain the lead sulfate filter residue and the first mother liquor, and separate the lead sulfate filter residue;

[0033] (2) The first mother liquor enters the second reactor, and one or more of carbon dioxide, quartz sand, and silicon are added into the second reactor, and the reaction temperature is 15° C. to obtain fluosilicic acid and the second mother liquor;

[0034] (3) The second mother liquor enters the third reactor, adds alkali or salt in the third reactor, reacts at a temperature of 15°C to obtain a reaction product, transfers the reaction product to a crystallization kettle for crystallization and obtains crystals and the third mother liquor, transferring the mixture of...

Embodiment 2

[0044] A resource utilization process of waste acid, such as figure 1 shown, including the following steps:

[0045] (3) Add the waste liquid produced by the electronics industry into the first reactor, then add the precipitating agent, add the filter to filter after fully stirring the reaction, obtain the lead sulfate filter residue and the first mother liquor, and separate the lead sulfate filter residue;

[0046] (4) The first mother liquor enters the second reactor, and one or more of carbon dioxide, quartz sand, and silicon is added to the second reactor, and the reaction temperature is 80° C. to obtain fluosilicic acid and the second mother liquor;

[0047] (3) The second mother liquor enters the third reactor, adds alkali or salt in the third reactor, reacts at a temperature of 90°C to obtain a reaction product, transfers the reaction product to a crystallization kettle for crystallization and obtains crystals and the third mother liquor, transferring the mixture of th...

Embodiment 3

[0057] A resource utilization process of waste acid, such as figure 1 shown, including the following steps:

[0058] (5) Add the waste liquid produced by the electronics industry into the first reactor, then add the precipitating agent, add the filter to filter after fully stirring the reaction, obtain the lead sulfate filter residue and the first mother liquor, and separate the lead sulfate filter residue;

[0059] (6) The first mother liquor enters the second reactor, and one or more of carbon dioxide, quartz sand, and silicon are added to the second reactor, and the reaction temperature is 45° C. to obtain fluosilicic acid and the second mother liquor;

[0060] (3) The second mother liquor enters the third reactor, adds alkali or salt in the third reactor, reacts at a temperature of 55°C to obtain a reaction product, transfers the reaction product to a crystallization kettle for crystallization and obtains crystals and the third mother liquor, transferring the mixture of t...

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Abstract

The invention relates to the field of waste acid treatment, and discloses a waste acid resource utilization process. The waste acid resource utilization process comprises the following steps of addingwaste liquid into a first reactor; then, adding precipitating agents for separating lead sulfate filtering slag through reaction; feeding first mother liquid into a second reactor; adding one or several kinds of materials of carbon dioxide, quartz sand and silicon; converting fluorine ions into hydrofluosilicic acid; feeding second mother liquid into a third reactor; adding alkali or salts into the third reactor; performing reaction crystallization to obtain crystals and third mother liquid; adding the third mother liquid into a triple effect evaporator; performing evaporation concentration to obtain nitrates so as to realize the resource utilization of the waste acid. Through medicament addition and special process utilization, fluorine and nitric acid in the waste acid are used for generating useful fluorine salts and nitrate; the treatment cost of the waste acid generated in the electronic industry production process such as solar batteries can be greatly reduced; the goals of changing dangerous waste into resources and reducing the quantity of the dangerous waste can be achieved, so that the goals of protecting the environment and improving the economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of waste acid treatment, in particular to a resource utilization process of waste acid. Background technique [0002] Solar cells, liquid crystal panel thinning, semiconductor production and other processes require mixed acids such as hydrofluoric acid, nitric acid, hydrochloric acid, and sulfuric acid for etching, cleaning, and texturing. During this process, a high concentration of waste acid will be produced as hazardous solid waste. The current treatment process is to add lime to neutralize, precipitate and add methanol to reduce the total nitrogen treatment to meet the emission standards. The traditional treatment process needs to consume a large amount of lime. And methanol, the cost of treatment is very high, and a large amount of sludge will be generated to be treated, and the total nitrogen is likely to exceed the standard. In order to solve the problem of waste acid treatment, the waste acid is used as a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/20C01B33/10C01D9/04
CPCC01B33/103C01D9/04C01G21/20
Inventor 应韵进
Owner 应韵进
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