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Method of utilizing hydrochloric acid pickling liquid waste to prepare compound ferrous flocculant

A technology for pickling waste liquid and compound ferrous iron, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, metallurgical waste water treatment, etc. Wide range of applications, low production cost and small footprint

Inactive Publication Date: 2015-02-18
SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, nearly one million m3 of such waste liquid is discharged every year in the country. 3 , and increases with the improvement of steel production and quality, its main components are ferrous ions and hydrochloric acid, generally adopt neutralization oxidation precipitation method, ferrous sulfate crystallization precipitation + oxidation neutralization precipitation method, deep well treatment method, etc. Complex, large equipment investment, high technical requirements, high cost

Method used

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  • Method of utilizing hydrochloric acid pickling liquid waste to prepare compound ferrous flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Prepare waste liquid, industrial sulfuric acid and sodium silicate reagents according to the design formula of ferrous ion:sulfate ion:silicate ion molar ratio of 10:5:8.

[0015] Add industrial sulfuric acid to the hydrochloric acid pickling waste liquid, then add sodium silicate, activate at room temperature for about 1 hour, then add a 0.1% ammonium chloride inorganic stabilizer, stir evenly, cover and seal for 8 hours, use its own The heat of reaction is used for aging and compounding, and after dissolution and diffusion, a composite ferrous flocculant is formed.

Embodiment 2

[0016] Embodiment two: performance test experiment

[0017] The composite ferrous prepared by the present invention, ferrous sulfate, and polyaluminum are compared to a certain towel factory wastewater treatment test, and the test results are shown in Table-1. Wherein, the dosage of compound ferrous is calculated by solution weight, and the dosage of ferrous sulfate and polyaluminum is calculated by solid weight.

[0018] Table-1 Test results

[0019]

[0020] It can be seen from Table-1 that the decolorization effect of the composite ferrous prepared by the present invention is obviously stronger than that of ferrous sulfate, and the removal rate of COD is slightly better than that of ferrous sulfate and polyaluminium.

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Abstract

The invention discloses a method of utilizing hydrochloric acid pickling liquid waste to prepare a compound ferrous flocculant, and belongs to the field of preparation method of an environmental protection material preparation. The method of utilizing the hydrochloric acid pickling liquid waste to prepare the compound ferrous flocculant comprises the following steps: adding an appropriate amount of industrial sulfuric acid in the hydrochloric acid pickling liquid waste, adding sodium silicate, activating the solution at indoor temperature for about 1 hour, then adding a stabilizer, uniformly stirring, then covering and sealing to take a reaction for hours, utilizing the reaction heat generated by the reaction to cure and compound, and conducting solubility and diffusion to generate the compound ferrous flocculant. The method of utilizing the hydrochloric acid pickling liquid waste to prepare the compound ferrous flocculant is to utilize the hydrochloric acid pickling liquid waste to prepare the compound ferrous flocculant with high flocculating performance, and then add the inorganic substance to prepare the finished product; the prepared compound ferrous flocculant is efficient and compound and excellent in turbidity removal and decoloration performances, can be used for treatment of heavy metal wastewater, phosphatizing wastewater and strong alkali wastewater to achieve the purpose of utilizing the liquid waste to treat the wastewater, and is high in efficiency, low in cost and worthy of further popularization.

Description

technical field [0001] The invention relates to a method for preparing a composite ferrous flocculant by using hydrochloric acid pickling waste liquid, and belongs to the field of preparation methods of environmentally friendly material preparations. Background technique [0002] In some cold-rolled strip mills and the entire electroplating industry, it is necessary to pickle steel parts and electroplated parts with hydrochloric acid to generate a large amount of pickling waste. At present, nearly one million m of such waste liquid is discharged every year in the country. 3 , and increases with the improvement of steel production and quality, its main components are ferrous ions and hydrochloric acid, generally adopt neutralization oxidation precipitation method, ferrous sulfate crystallization precipitation + oxidation neutralization precipitation method, deep well treatment method, etc. Complexity, large investment in equipment, high technical requirements and high cost. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/5245C02F2103/16
Inventor 陆强
Owner SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION