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Preparation method of compound ferrous chloride flocculating agent

A ferrous chloride and flocculant technology, applied in chemical instruments and methods, ferric halide, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of high cost, inconvenient use, high cost of ferrous chloride, etc., and achieve saving Cost, Pollution Reduction Effect

Inactive Publication Date: 2019-02-22
嘉兴市环科环保新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the existing flocculants use ferrous chloride or ferric chloride, but the cost of solid ferrous chloride is high, and when preparing the flocculant, it needs to be dissolved with steam, the process is very cumbersome, and the high concentration of trichloride Ferrous iron is a hazardous chemical with high cost and very inconvenient to use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of preparation method of composite ferrous chloride flocculant, described preparation method comprises the following steps:

[0017] (1) The waste acid solution produced after pickling carbon steel with hydrochloric acid (the main component is ferrous chloride, the content is 20%), and the filtered waste acid solution is obtained after precipitation and pressure filtration;

[0018] (2) Heat the filtered waste acid solution in the reaction kettle, vacuumize it under negative pressure, and concentrate it, then add oxidant oxygen, and add oxidant oxygen 2 to each ton of the waste acid solution containing 20% ​​ferrous chloride -5kg / h, after stirring or pump circulation, part of the divalent iron ions in the filtered waste acid solution are converted into ferric ions, and a composite chlorination system mainly composed of ferric chloride and supplemented by ferric chloride is obtained. Ferrous flocculant.

[0019] Add oxidizer sodium chlorate 0.02kg in the describe...

Embodiment 2

[0021] A kind of preparation method of composite ferrous chloride flocculant, described preparation method comprises the following steps:

[0022] (1) The waste acid solution produced after pickling carbon steel with hydrochloric acid (the main component is ferrous chloride, the content is 20%), and the filtered waste acid solution is obtained after precipitation and pressure filtration;

[0023] (2) Heat the filtered waste acid solution in the reactor, vacuumize it under negative pressure, and concentrate it, then add oxidant oxygen, and add oxidant chloric acid to each ton of the waste acid solution containing 20% ​​ferrous chloride Sodium 0.02kg, make the part divalent iron ion in the spent acid liquid after filtering to convert ferric ion into ferric ion after stirring or pump circulation, obtain the main compound dichloride with iron dichloride, ferric trichloride is auxiliary Iron flocculant.

[0024] The reaction mechanism of the present invention is: 4FeCl 2 +O 2 +4...

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Abstract

The invention discloses a preparation method of a compound ferrous chloride flocculating agent. The preparation method includes: subjecting waste acid liquid generated after hydrochloric acid is adopted to pickle carbon steel to precipitating, filtering, heating and negative pressure vacuumizing and concentrating, adding an oxidant, and stirring or pump circulating to enable part of divalent ironions in the waste acid liquid after being filtered to be converted into trivalent iron ions to obtain the compound ferrous chloride flocculating agent taking ferrous chloride as a main component and ferric trichloride as an auxiliary component. The waste acid liquid generated after adopting the hydrochloric acid to pickle the carbon steel is taken as a raw material, so that cost is saved, the waste acid liquid is utilized sufficiently, waste resources are reutilized, and environment pollution caused by emission is reduced; the compound ferrous chloride flocculating agent taking ferrous chloride as the main component and ferric trichloride as the auxiliary component has better flocculating effect than unitary ferrous chloride or ferric trichloride flocculating agents.

Description

technical field [0001] The invention relates to the technical field of flocculant preparation, in particular to a preparation method of a composite ferrous chloride flocculant. Background technique [0002] In the process of industrial production, enterprises discharge a large amount of liquid waste and solid waste every day. These wastes are directly discharged, which not only pollutes the environment, but also wastes a lot of resources. For this reason, how to carry out selective and comprehensive recycling of these wastes to realize "turning waste into treasure" is increasingly attracting the attention of the whole society. [0003] Most of the existing flocculants use ferrous chloride or ferric chloride, but the cost of solid ferrous chloride is high, and when preparing the flocculant, it needs to be dissolved with steam, the process is very cumbersome, and the high concentration of trichloride Iron oxide is a dangerous chemical, and it is expensive and inconvenient to...

Claims

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Application Information

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IPC IPC(8): C02F1/52C01G49/10
CPCC01G49/10C02F1/5236
Inventor 金月祥
Owner 嘉兴市环科环保新材料科技有限公司
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