Method for preparing modified poly-ferric chloride coagulant

A technology of polyferric chloride and coagulant, which is applied in the direction of ferric halide and other directions, can solve the problems such as difficulty in reaching the standard of water quality and poor effect, and achieve the effects of good removal effect, safe and simple operation, and low reaction temperature.

Active Publication Date: 2010-06-02
3R ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the poor polymerization and coagulation effect of polyferric chloride, especially the difficult problem that the chromaticity of water quality after treatment is difficult to reach the standard, and to provide a simple, safe and efficient preparation of modified polyferric chloride coagulant method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1) Purification of hydrochloric acid iron and steel pickling waste liquid: add a sufficient amount of scrap iron scraps and carbon powder of 1% of the quality of hydrochloric acid iron and steel pickling waste liquid in the hydrochloric acid iron and steel pickling waste liquid of the mechanical processing industry, consume free hydrochloric acid wherein, After the reaction is completed and filtered, the filtrate is 15% hydrochloric acid iron and steel pickling waste liquid after the purification of the ferrous ion content, and the pH value of the filtrate is adjusted to be 5;

[0013] 2) Add water to industrial water glass (modulus 1.6-2.0) to make SiO 2 The mass concentration is 5% solution, then to it, add sodium chlorate (industrial product, sodium chlorate content more than 95%) and stir to obtain mixed solution, add the purified hydrochloric acid pickling waste liquid in the reactor, Turn on the agitator, control the stirring speed to 300r / min, and the temperature...

Embodiment 2

[0015] 1) Purification of hydrochloric acid iron and steel pickling waste liquid: add a sufficient amount of scrap iron scraps and 3% carbon powder of the quality of hydrochloric acid iron and steel pickling waste liquid in the hydrochloric acid iron and steel pickling waste liquid of the mechanical processing industry, consume free hydrochloric acid wherein, After the reaction is completed and filtered, the filtrate is purified ferrous ion content of 10% hydrochloric acid iron and steel pickling waste liquid, and the pH value of the filtrate is adjusted to be 1;

[0016] 2) Add water to industrial water glass (modulus 1.6-2.0) to make SiO 2 The mass concentration is 3% solution, then to it, add sodium chlorate (industrial product, sodium chlorate content more than 95%) and stir to obtain mixed solution, add the purified hydrochloric acid pickling waste liquid in the reactor, Turn on the stirrer, control the stirring speed to 100r / min, and the temperature to 0°C, slowly add th...

Embodiment 3

[0018] 1) Purification of hydrochloric acid iron and steel pickling waste liquid: add a sufficient amount of scrap iron scraps and carbon powder of 5% of the quality of hydrochloric acid iron and steel pickling waste liquid in the hydrochloric acid iron and steel pickling waste liquid of the mechanical processing industry, consume free hydrochloric acid wherein, After the reaction is completed and filtered, the filtrate is 13% hydrochloric acid iron and steel pickling waste liquid after the purification of the ferrous ion content, and the pH value of the filtrate is adjusted to be 3;

[0019] 2) Add water to industrial water glass (modulus 1.6-2.0) to make SiO 2 The mass concentration is 1% solution, then to it, add sodium chlorate (industrial product, sodium chlorate content more than 95%) and stir to obtain mixed solution, add the purified hydrochloric acid pickling waste liquid in the reactor, Turn on the stirrer, control the stirring speed to 500r / min, and the temperature ...

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Abstract

The invention relates to a method for preparing modified poly-ferric chloride coagulant, which comprises the following steps of: adding sufficient waste iron scraps and carbon powder into the hydrochloric acid steel acid-washing waste liquid of a mechanical processing industry; after reaction is finished, filtering, wherein the filter liquid is the purified hydrochloric acid steel acid-washing waste liquid; adding the purified hydrochloric acid steel acid-washing waste liquid into a reactor, starting a stirrer, slowly adding the mixed liquid of industrial sodium silicate and sodium chlorate at constant speed and ageing at room temperature to obtain the modified poly-ferric chloride coagulant. The industrial sodium silicate and the sodium chlorate are mixed into the mixed liquid, the mixed liquid is added into the purified hydrochloric acid steel acid-washing waste liquid under the condition of stirring, the ferric iron generated after ferrous oxidation and silicon carry out interpenetrating network type polymerization immediately, and an inorganic macromolecule with favorable polymerization performance is obtained.

Description

technical field [0001] The invention relates to a method for preparing a modified polyferric chloride coagulant by using hydrochloric acid iron and steel pickling waste liquid as a raw material and sodium chlorate and sodium silicate as modifiers. Background technique [0002] Coagulants are one of the most basic treatment technologies in urban water supply, urban sewage and industrial wastewater treatment processes. Although there are many factors that affect the coagulation effect, coagulants are decisive. Hydrochloric acid iron and steel pickling waste liquid is an ideal raw material for the preparation of coagulant polyferric chloride. However, due to the unsatisfactory performance of ferric ion hydrolysis and polymerization, the resulting polyferric chloride not only has poor stability, but also has unsatisfactory coagulation effect, especially The water quality after treatment is difficult to reach the standard due to the presence of residual iron, which leads to the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10
Inventor 孙根行欧阳晏颖连培聪郭昌梓周庆芳
Owner 3R ENVIRONMENTAL TECH CO LTD
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