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Method for producing ferric salt-series purifiers by recycling and comprehensive utilizing stainless steel waste etching solution

A technology for comprehensive utilization of etching waste liquid, applied in chemical instruments and methods, iron halide, oxidized water/sewage treatment, etc., can solve the problems of high production cost and complicated operation of nickel technology

Inactive Publication Date: 2013-03-27
天津市聚鑫源水处理技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to overcome the shortcomings of high production cost and complicated operation of the existing etching waste liquid regeneration and nickel recovery technology, and in accordance with the principle of resource reuse, to invent a comprehensive utilization of stainless steel etching waste liquid resources to produce iron-based water purifiers Methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Measure 1000 kg of etching waste liquid into a 1000L oxidation kettle with adjustable temperature, start stirring, add 45 kg of ferrous sulfate heptahydrate crystals, and make it dissolve continuously under stirring.

[0025] 2. Start the ozone generator and pass the generated ozone into the oxidation kettle. With the progress of oxidation heat release, the temperature will rise slowly, control the amount of ozone generated, and keep warm when the temperature rises to 55-60°C. , until the ferrous sulfate is completely dissolved.

[0026] 3. Detect the content of divalent iron ions in the etching waste liquid, stop the ozone oxidation until the ferrous ions are nearly completely oxidized into ferric ions, and put the mixture into the crystallization kettle.

[0027] 4. Add an appropriate amount of 30% hydrochloric acid solution to the crystallization tank, adjust the pH of the mixture between 0.2 and 0.5, and keep it within this range.

[0028] 5. Adjust the stirring...

Embodiment 2

[0037] 1. Measure 1000 kg of etching waste liquid into a 1000L oxidation kettle with adjustable temperature, start stirring, add 45 kg of ferrous sulfate heptahydrate crystals, and make it dissolve continuously under stirring.

[0038] 2. Start the ozone generator and pass the generated ozone into the oxidation kettle. With the progress of oxidation heat release, the temperature will rise slowly, control the amount of ozone generated, and keep warm when the temperature rises to 55-60°C. , until the ferrous sulfate is completely dissolved.

[0039] 3. Detect the content of divalent iron ions in the etching waste liquid, stop the oxidation of the ozone generator until the ferrous ions are nearly completely oxidized into ferric ions, and put the mixture into the crystallization kettle.

[0040] 4. Add an appropriate amount of 30% hydrochloric acid solution to the crystallization kettle, adjust the pH of the mixture between 0.5 and 1, and keep it in this range.

[0041] 5. Adjust...

Embodiment 3

[0050] 1. Measure 1000 kg of etching waste liquid and pour it into a 1000L oxidation kettle with adjustable temperature, start stirring, add 100 kg of ferrous sulfate heptahydrate crystals, and make it dissolve continuously under stirring.

[0051] 2. Start the ozone generator and pass the generated ozone into the oxidation kettle. With the progress of oxidation heat release, the temperature will rise slowly, control the amount of ozone generated, and keep warm when the temperature rises to 55-60°C. , until the ferrous sulfate is completely dissolved.

[0052] 3. Detect the content of divalent iron ions in the etching waste liquid, stop the oxidation of the ozone generator until the ferrous ions are nearly completely oxidized into ferric ions, and put the mixture into the crystallization kettle.

[0053] 4. Add an appropriate amount of 30% hydrochloric acid solution to the crystallization kettle, adjust the pH of the mixture between 0.5 and 1.0, and keep it in this range.

[...

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Abstract

The invention relates to a method for producing ferric salt-series purifiers by recycling and comprehensive utilizing a stainless steel waste etching solution, which is developed for overcoming the defects of high production cost, halfway separation and complicated operation existing in the traditional stainless steel waste etching solution regeneration and nickel recovery technology. The method comprises the following steps of: firstly performing component analysis on the waste etching solution, additionally adding a certain amount of ferrous sulfate heptahydrate crystal according to the contents of nickel and chromium, and then oxidizing by using ozone; when Fe<2+> in a mixture is all oxidized to Fe<3+>, moving the mixture to a crystallization kettle, and adding hydrochloric acid to regulate pH value; forming hydrated sulfate and chlorate crystallized substances containing nickel and chromium ions by controlling the crystallization temperature and time, stirring speed and pH value; performing solid-liquid seperation on the crystallized substances, and then performing secondary crystallization when the contents of nickel and chromium in a filtrate are proper until the contents of the nickel and chromium in the filtrate are less than 100PPM; obtaining ferric chloride as a chemical component of the filtrate after separation, and producing other ferric salt-series purifiers by adjusting the amounts of ferrous sulfate and the hydrochloric acid.

Description

technical field [0001] The invention belongs to the comprehensive utilization of waste in the field of resources and environment, and relates to a resource utilization technology of etching waste liquid produced in stainless steel surface etching processing, in particular to a method of reusing nickel and chromium ions contained in stainless steel etching waste liquid The method is to separate and remove the mixture in the form of hydrated crystals, and use the filtrate to produce iron salt series water purifier products. Background technique [0002] Due to its superior corrosion resistance, unique surface and excellent processing performance, stainless steel has developed rapidly in production and application. The stainless steel plate has smooth surface, high plasticity, toughness and mechanical strength, corrosion resistance to acid, alkali, gas and other media, and is widely used in industry, decoration and life. [0003] With the development of electronics and communi...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52C01G49/10C22B7/00C02F1/78
CPCY02P10/20
Inventor 王富鑫张秀媛王柳洋
Owner 天津市聚鑫源水处理技术开发有限公司
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