Preparation method of polyaluminum ferric chloride

A polyaluminum ferric chloride, polyaluminum chloride technology, applied in chemical instruments and methods, iron halide, water/sewage treatment, etc., can solve unseen problems, achieve resource saving, easy operation, and help The effect of environmental protection

Active Publication Date: 2015-01-07
CHANGSHU CITY FOR THE YU ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] A) To prepare the waste acid stock solution, mix dilute hydrochloric acid with a mass percentage concentration of 35% into the iron-containing waste acid solution with a mass percentage concentration of 14% produced during metal surface treatment, such as metal surface cleaning, until the iron-containing waste acid solution is obtained. The mass percent concentration of the waste acid solution is increased to 15%, and the iron-containing waste acid stock solution is obtained. In this step, the aforementioned iron-containing waste acid solution is stored in the iron-containing waste acid storage tank after pre-collection. The waste iron acid solution is discharged from the storage tank. An example of the calculation method is to use dilute hydrochloric acid with a mass percentage concentration of 35% to mix 1000kg of iron-containing waste acid solution with a mass percentage concentration of 14% to a mass percentage concentration of 15%: ( 140+35%X)÷(1000+X)=15%, then: 14...

Embodiment 2

[0033] A) To prepare the waste acid stock solution, mix dilute hydrochloric acid with a mass percentage concentration of 37% into the iron-containing waste acid liquid with a mass percentage concentration of 10% produced by electroplating until the mass percentage concentration of the iron-containing waste acid liquid is obtained. Increase to 18% to obtain the iron-containing waste acid stock solution. In this step, the aforementioned iron-containing waste acid liquid is stored in the iron-containing waste acid liquid storage tank after pre-collection. Emit, adopt the dilute hydrochloric acid that mass percentage concentration is 37% to be that the mass percentage concentration is 10% the 1000kg iron-containing waste acid solution that the mass percentage concentration is 18% and the calculation method is as the description of embodiment 1 (the calculation method is the same as the embodiment 1);

[0034] B) To prepare the primary product of polyaluminum ferric chloride, put t...

Embodiment 3

[0037] A) To prepare the waste acid stock solution, mix dilute hydrochloric acid with a mass percentage concentration of 36% into the iron-containing waste acid solution with a mass percentage concentration of 12% produced by the steel plate manufacturer’s cleaning of the steel plate, that is, pickling, until the iron-containing waste acid solution is obtained. The mass percent concentration of the waste acid solution is increased to 16.5%, and the iron-containing waste acid stock solution is obtained. In this step, the aforementioned iron-containing waste acid solution is stored in the iron-containing waste acid storage tank after pre-collection. Release in the iron waste acid liquid storage tank, adopt the dilute hydrochloric acid that mass percentage concentration is 36% to be 1000kg iron-containing waste acid liquid that mass percentage concentration is 12% and be mixed to mass percentage concentration and be that the calculation method of 16.5% is as to embodiment 1 descri...

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Abstract

The invention relates to a preparation method of polyaluminum ferric chloride, belonging to the technical field of preparation of inorganic high-polymer coagulating agents. The method comprises the following steps: adding dilute hydrochloric acid into a 10-14% iron-containing spent acid solution until the concentration of the iron-containing spent acid solution is enhanced to 15-18%, thereby obtaining an iron-containing spent acid solution; adding the iron-containing spent acid solution into a reaction vessel in batches, adding aluminum ash to obtain a stock solution, and carrying out polymerization reaction on the stock solution while continuously stirring, thereby obtaining a polyaluminum ferric chloride initial product; and discharging the initial product out of the reaction vessel, introducing into a precipitation tank, adding a back blending solution into the precipitation tank, adding a precipitant and PAM (polyacrylamide) into the precipitation tank, stirring uniformly, standing to stratify, introducing the supernatant into a finished product tank to obtain the polyaluminum ferric chloride, introducing the precipitate in the precipitation tank into a pressure filter to perform pressure filtration, and using the pressure filtrate as the back blending solution. The method saves the resources, and is beneficial to environmental protection; the processing steps are short and easy to operate; and the method has ideal energy-saving effect.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic polymer coagulants, and in particular relates to a preparation method of polyaluminum ferric chloride. Background technique [0002] The reason why polyaluminum ferric chloride is widely used in the treatment of drinking water, industrial water, domestic wastewater and industrial sewage is because it has advantages not limited to the ten aspects summarized below: First, the dosage is lower than traditional Coagulants such as polyferric sulfate and polyaluminum chloride; the second is to combine the characteristics of inorganic polymer polyaluminum chloride and polyferric chloride; the third is to form flocs and precipitate quickly, and the processing capacity Strong; Fourth, the consumption of alkalinity in water is small, and the pH value of the effluent drops less; Fifth, the insoluble matter in the aqueous solution is low and the light transmittance is good; Sixth, the applicabl...

Claims

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Application Information

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IPC IPC(8): C02F1/52C01G49/10
CPCC01G49/10C02F1/5236
Inventor 朱雪峰徐晓锋刘遗松夏平
Owner CHANGSHU CITY FOR THE YU ENVIRONMENT TECH
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