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Resource recycling method of iron-containing waste sulfuric acid solution

A technology for resource recovery and waste sulfuric acid, applied in ferric sulfate, sulfur trioxide/sulfuric acid, chemical instruments and methods, etc., can solve the problems of high failure rate and increase the complexity of operation, and achieve zero discharge and high utilization rate of sulfuric acid. , to avoid the inconvenience of long-distance transportation

Inactive Publication Date: 2018-06-01
大拇指环保设备(天津)有限公司
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  • Application Information

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Problems solved by technology

The membrane filtration system also needs regular backwashing, which has a high failure rate and increases the complexity of the operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 1000kg of iron-containing waste sulfuric acid solution (25% ferrous sulfate content, 10% sulfuric acid content) into the pretreatment reactor, start stirring, then add 0.1kg iron powder, after half an hour of reaction, add 1kg heavy metal scavenger , and reacted for another half an hour, separated by filtration through a filter to obtain a reaction solution. Control above reaction temperature between 5~45 ℃.

[0020] Elevate the reaction liquid to the crystallization reactor, start stirring, turn on the refrigeration system to control the reaction temperature, and control the above reaction temperature between -25 and 45°C. In reactor, add 110kg mass fraction and be 98% industrial sulfuric acid, start to stir, react and crystallize after 2.5 hours, obtain two kinds of products by filtration: high-purity ferrous sulfate crystal (solid) and dilute sulfuric acid solution. The mass fraction of ferrous sulfate heptahydrate in high-purity ferrous sulfate crystals is ≥ 85...

Embodiment 2

[0022] Continuously add 200kg / h iron-containing waste sulfuric acid solution (25% ferrous sulfate content, 10% sulfuric acid content) to the pretreatment reactor, continuously stir, then continuously add 0.02kg / h iron powder, continuously add 0.2 kg / h of the heavy metal scavenger is continuously filtered and separated through a filter to obtain a reaction solution. Control above reaction temperature between 5~45 ℃.

[0023] The reaction solution is continuously raised to the crystallization reactor, and continuously stirred, and the refrigeration system controls the reaction temperature between -25 and 45°C. Continuously dosing 21kg / h massfraction in reactor is the industrial sulfuric acid of 98%, reacts and after crystallization 2.5 hours, obtains two kinds of products by filtering the mixed solution containing ferrous sulfate crystal continuously: high-purity ferrous sulfate crystal ( solid) and dilute sulfuric acid solution. The mass fraction of ferrous sulfate heptahydra...

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Abstract

The invention discloses a resource recycling method of an iron-containing waste sulfuric acid solution. The method comprises steps as follows: the iron-containing waste sulfuric acid solution is addedto a pretreatment reaction kettle, iron powder and a heavy metal trapping agent are added to the pretreatment reaction kettle for a mixing and stirring reaction, filtration is performed and a reaction liquid is obtained; the reaction liquid is lifted to a crystalizing reaction kettle, industrial sulfuric acid is added to the crystalizing reaction kettle in a certain proportion during cooling, themixture is mixed and stirred, reactive crystallization and filtration are performed, and two products, namely, high-purity ferrous sulfate crystals (solids) and a diluted sulfuric acid solution, areobtained. The method has the benefits as follows: two products, namely, the high-purity ferrous sulfate crystals (solids) and the diluted sulfuric acid solution, are obtained from the iron-containingwaste sulfuric acid solution; the process operation is simple, production is safe and environmentally friendly, the sulfuric acid utilization rate is high, no waste liquids are discharged, and the economic benefits are good. Obtained ferrous sulfate is convenient to store and transport, has very low content of heavy metals, is high in additional value and is used for preparing iron salt, iron oxide pigments, mordants, water purifiers, preservatives, disinfectants and the like.

Description

Technical field: [0001] The invention belongs to the technical field of hazardous waste disposal, resource regeneration and development of circular economy, and relates to a method for preparing high-purity ferrous sulfate crystals and recovering dilute sulfuric acid solution by using waste iron-containing sulfuric acid solution. Background technique: [0002] With the rapid development of the national economy, during the pickling process of ferrous metal products, a large amount of iron-containing waste sulfuric acid solution is produced, and the waste liquid contains different mass fractions of sulfuric acid and a large amount of Fe. 2+ , followed by Fe 3+ 、Cu 2+ 、Cr 6+ , Mg 2+ 、Si 4+ , Pb 2+ 、Ni 2+ the presence of heavy metal ions. How to efficiently and reasonably dispose of iron-containing waste sulfuric acid solution is a key content of environmental protection work. Under the guidance of the policy of realizing resource regeneration and developing circular eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14C01B17/90
CPCC01G49/14C01B17/901C01P2006/80
Inventor 陈青松
Owner 大拇指环保设备(天津)有限公司
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