A kind of method and system for preparing polyferric chloride sulfate with pickling waste liquid

A technology for polymerizing chlorinated sulfuric acid and pickling waste liquid, applied in ferric sulfate, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of environmental pollution and high cost, shorten the reaction time, reduce the production cost, and increase the gas Effect of liquid mixing area

Active Publication Date: 2017-06-09
LUXI CHEM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above problems, to provide a method and system for preparing polymeric ferric sulfate chloride with pickling waste liquid, which solves the high cost and environmental pollution problems of waste acid treatment in the prior art and the traditional production polymerization The deficiencies in the method of iron flocculant, at the same time, a high value-added water purifier with good stability

Method used

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  • A kind of method and system for preparing polyferric chloride sulfate with pickling waste liquid

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Experimental program
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Effect test

Embodiment 1

[0036] Adding total iron content in the dissolving tank under agitation is 20kg of pickling waste liquid 20kg, ferrous sulfate 3.4kg, concentrated hydrochloric acid 2kg of 9 (w / w)% in the dissolving kettle, treats that after ferrous sulfate dissolves, add pickling waste liquid weight 0.3(w / w)% stabilizer trisodium phosphate, stir well and evenly. Heat the solution to 70°C, pump it into the circulating reactor. The external circulation of the circulating reactor is opened, and oxygen is introduced. The prepared sodium nitrate and potassium iodide solutions with a total concentration of 11.2 (w / w)% were continuously added to the circulating reactor, and the addition was completed within 1 hour. The reaction was carried out for 2.5 hours, and the polymerized ferric sulfate chloride was obtained after aging for 18 hours.

[0037] Take 0.85mL of polyferric sulfate chloride product, put it into 1L of domestic wastewater, stir it mechanically for 8 minutes, let it stand for stratif...

Embodiment 2

[0041] Adding total iron content to the dissolving tank under stirring conditions is 60kg of pickling waste liquid, 4kg of iron powder, and 6kg of concentrated sulfuric acid with a total iron content of 11 (w / w). After the iron powder dissolves, add 0.2 (w) / w)% stabilizer sodium dihydrogen phosphate, fully stir evenly. Heat the solution to 80°C and pump it into the circulating reactor. The external circulation of the reactor was opened, and oxygen was introduced. The prepared sodium nitrate and potassium iodide solutions with a total concentration of 13.6 (w / w)% are continuously added to the circulating reactor, and the addition is completed within two hours. The reaction was carried out for 3 hours, and the polymerized ferric sulfate chloride was obtained after aging for 16 hours.

[0042] Put 0.6mL of polyferric chloride product into 1L of synthetic wastewater, stir it mechanically for 11 minutes, let it stand for stratification, take the upper liquid to measure the chemi...

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Abstract

The invention discloses a method and a system for preparing ferric sulfate polychloride from an acid pickling waste solution. The method comprises the following steps: adding a steel acid pickling waste solution, ferrous sulfate or iron powder and concentrated hydrochloric acid or concentrated sulfuric acid into a dissolution kettle, mixing them completely and uniformly, and then adding a solid stabilizer phosphate therein; heating the prepared solution to a temperature of 60-100 degrees centigrade, putting the heated solution into a recirculation reactor; introducing oxygen into the recirculation reactor, and installing a gas distributor; using sodium nitrate and potassium iodide as catalysts, preparing the sodium nitrate and the potassium iodide into a solution, adding the solution into a tower reactor within 1-2 hours; subjecting the solution to oxidation hydrolysis polymerization reaction for 2-5 hours, allowing it to stand and cure for 10-24 hours, then obtaining the ferric sulfate polychloride. By preparing the ferric sulfate polychloride from the steel acid pickling waste solution, the environmental contamination caused by the industrial acid pickling waste solution is reduced, the resources are completely utilized, and the waste is changed into things of value; the ferrous sulfate and the sulfuric acid are added in the experiment process, thereby the stability of the final product and the basicity of the product are effectively increased.

Description

technical field [0001] The invention relates to the technical field of environmental protection chemical industry, in particular to a method and system for preparing polymerized ferric sulfate chloride from pickling waste liquid. Background technique [0002] In the steel processing and electroplating industry, it is often necessary to use hydrochloric acid to clean the surface of steel parts and electroplated parts to remove rust on the surface. During the pickling process, the hydrochloric acid in the hydrochloric acid lotion is continuously consumed, and the ferrous ions in it are also continuously increased with the consumption of hydrochloric acid, until the hydrochloric acid lotion no longer has cleaning effect, and at this time, washing waste is generated. The liquid is pickling waste liquid, and the main components of the iron and steel pickling waste liquid are water, ferrous chloride, free acid and a small amount of impurities. The waste liquid is discharged in a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C01G49/14
Inventor 张艳君周脉友毕静利李娥
Owner LUXI CHEM GRP
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