Method for synthesizing novel water purifying agent by utilizing steel acid pickling waste liquid

A technology for steel pickling waste liquid and pickling waste liquid, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water/sewage treatment, etc. Realize the effect of high value utilization, broad application prospects and resource saving

Active Publication Date: 2018-09-07
江苏宝钢精密钢丝有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods have their own defects
The neutralization method not only needs to consume a large amount of alkali (such as lime, sodium hydroxide, etc.), but also produces high-concentration waste brine and a large amount of solid waste, and the comprehensive treatment cost is very high
Evaporation and crystallization can recover part of the acid and iron ions in the pickling waste liquid, but it

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1:

[0026] A steel wire pickling workshop in Jiangsu produces about 10 tons of pickling waste liquid every day, with a hydrochloric acid concentration of 12.8% and a total iron concentration of 78.7 g / L.

[0027] Using the method of the present invention to utilize the above-mentioned pickling waste liquid, the steps are as follows:

[0028] 1) Use an ion exchange membrane processor to separate the pickling waste liquid to obtain recovered acid (hydrochloric acid concentration 10.9%) and iron-containing solution (hydrochloric acid concentration 1.93%, total iron concentration 75.2g / L). After the recovered acid is adjusted for concentration Recycle to the pickling line, and the iron-containing solution enters the storage tank;

[0029] 2) Pump 4L of iron-containing solution into an electrolytic cell equipped with graphite cathode and graphite anode, electrolyze it for 1 hour at a working voltage of 2.5V, and then take out the graphite cathode. At this time, a layer of e...

Example Embodiment

[0032] Example 2:

[0033] A steel pipe pickling workshop in Jiangsu produces about 15 tons of pickling waste liquid every day, with a hydrochloric acid concentration of 2.51% and a total iron concentration of 191.8g / L.

[0034] Using the method of the present invention to utilize the above-mentioned pickling waste liquid, the steps are as follows:

[0035] 1) Pump 4L of pickling waste liquid into an electrolytic cell equipped with graphite cathode and graphite anode, and electrolyze for 2 hours at a working voltage of 3.0V, and then take out the graphite cathode. At this time, a layer of simple substance has been deposited on the graphite cathode iron;

[0036] 2) Immerse the graphite electrode for depositing elemental iron in an electrolytic cell containing 30% sodium hydroxide aqueous solution, use the graphite electrode as the anode and the other set of graphite electrodes as the cathode, and electrolyze for 3 hours at a working voltage of 4.5V. All the iron on the graphite anode...

Example Embodiment

[0038] Example 3:

[0039] A steel pipe pickling workshop in Shanghai produces about 12 tons of pickling waste liquid every day, with a sulfuric acid concentration of 5.7% and a total iron concentration of 139.6g / L.

[0040] Using the method of the present invention to utilize the above-mentioned pickling waste liquid, the steps are as follows:

[0041] 1) Put the PE tank in a ventilated place with no fire source, pump the pickling waste liquid into the PE tank, then add excess iron filings, and circulate with an acid-resistant pump until the sulfuric acid concentration in the pickling waste liquid is not higher than 1% ;

[0042] 2) Pump the acid-washing waste liquid with adjusted concentration into an electrolytic cell equipped with graphite cathode and titanium-based coating anode, electrolyze for 2 hours under the condition of working voltage of 2.5V, and then take out the graphite cathode. A layer of elemental iron has been deposited on it;

[0043] 3) Immerse the graphite electr...

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PUM

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Abstract

The invention discloses a method for synthesizing a novel water purifying agent by utilizing steel acid pickling waste liquid. The method specifically comprises the following steps: (1) enabling the concentration of hydrogen ions in the acid pickling waste liquid to be not higher than 2mol/L and the total iron concentration to be not lower than 0.5g/L by adopting a physical or chemical method; (2)carrying out electrolytic treatment on the acid pickling waste liquid by taking one noble electrode as a positive electrode and the other noble electrode or an iron electrode as a negative electrode,and depositing iron ions in the negative electrode in a form of an iron element or iron compound; (3) putting the negative electrode in a strong alkaline electrolyte after depositing a certain amountof iron or iron compound on the negative electrode, carrying out electrolytic treatment by as a positive electrode, and converting iron on the positive electrode into strong-oxidation ferrate by utilizing oxidation of the positive electrode; (4) enabling the ferrate to exist in a strong alkaline solution in a form of a solute or an insoluble substance, and forming the novel water purifying agent.The method disclosed by the invention has the advantages that emission of industrial waste is reduced, the resource is saved, high-value utilization of the iron ions can be realized, and a very goodapplication prospect is obtained.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for synthesizing a new type of water purifying agent by using iron and steel pickling waste liquid. Background technique [0002] Iron and steel pickling waste liquid usually contains a relatively high concentration of iron ions and inorganic strong acids (such as hydrochloric acid, sulfuric acid, nitric acid, etc.), which are highly acidic and corrosive, and have been included in the "National List of Hazardous Wastes". If the steel pickling waste liquid is discharged directly without treatment, it will not only cause waste of resources, but also cause serious harm to the environment. [0003] At present, the treatment methods of steel pickling waste liquid mainly include neutralization method, evaporation crystallization method, direct roasting method and so on. However, the above-mentioned methods all have their own defects. The neutralization metho...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F1/461C02F103/16
CPCC02F1/28C02F1/42C02F1/46109C02F1/52C02F1/66C02F1/72C02F2103/16
Inventor 徐正超闵学刚方峰李琦马聪骆凯翔李龙郑鹏飞
Owner 江苏宝钢精密钢丝有限公司
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