Preparation method of ferric salt solution

A solution and iron salt technology, applied in chemical instruments and methods, water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor pollution removal ability and high price of divalent iron salt coagulant, Achieve good decontamination effect

Active Publication Date: 2016-06-01
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the price of the existing ferric salt coagulant is relatively high, and the ability of the ferrous salt coagulant to remove pollution is relatively poor, and to provide a cheap and efficient ferric salt coagulant Preparation

Method used

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  • Preparation method of ferric salt solution

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specific Embodiment approach 1

[0013] Specific embodiment one: the preparation method of iron salt solution of this embodiment is realized according to the following steps:

[0014] 1. Weigh the ferrous salt solid and place it in the reaction vessel;

[0015] 2. Add concentrated acid dropwise to the surface of the ferrous salt solid in the reaction vessel to obtain acid-treated ferrous salt;

[0016] 3. Add distilled water to the reaction vessel to dissolve the acid-treated ferrous salt to obtain an iron salt solution with a pH of 2 to 7;

[0017] Wherein the ferrous salt described in step 1 is a mixture of one or more of ferrous chloride, ferrous sulfate, ferrous nitrate and ferrous perchlorate in any ratio.

[0018] In this embodiment, concentrated acid is used to oxidize ferrous iron into ferric iron, and the obtained iron salt solution has a decontamination effect equivalent to that of ordinary ferric salt. The reaction between concentrated acid and ferrous salt can convert solid ferric The valent iro...

specific Embodiment approach 2

[0019] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the form of the solid ferrous salt described in step 1 is granular or powder. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0020] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the concentrated acid described in step 2 is one or more mixed acids of concentrated sulfuric acid, concentrated hydrochloric acid, and concentrated nitric acid. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

[0021] When this embodiment is mixed acids, they can be mixed in any ratio.

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Abstract

The invention relates to a preparation method of a ferric salt solution, belongs to the field of water treatment, and particularly relates to a method for generating a ferric salt coagulant through reaction of bivalent ferric salt and concentrated acid. The method solves the problems that the price of the existing trivalent ferric salt coagulant is high; the pollution eliminating capability of the bivalent ferric salt coagulant is poor. The preparation method of the ferric salt solution comprises the following steps of 1, weighing bivalent ferric salt solid into a reaction container; 2, dripping concentrated acid onto the surface of the bivalent ferric salt in the reaction container to obtain acid treated bivalent ferric salt; 3, then, adding distilled water for dissolving the acid treated bivalent ferric salt to obtain the ferric salt solution. The preparation method has the advantages that concentrated acid is used for taking a reaction with the bivalent ferric salt; the prepared ferric salt solution has a good pollution eliminating effect; the removal rate of the ferric salt solution on molybdate can reach 90 percent to 98 percent; the price of the bivalent ferric salt is much lower than that of an ordinary ferric sulfate; the preparation method is simple; the implementation is easy.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for generating an iron salt coagulant by reacting divalent iron salt and concentrated acid. Background technique [0002] Ferric salt (ferric chloride, ferric sulfate, ferric nitrate, etc.) is a commonly used coagulant for water treatment, which can be formed by hydrolysis of ferric ions such as Fe(OH) 2+ ,Fe(OH) 2 + ,Fe 2 (OH) 2 4+ ,Fe 4 (OH) 6 6+ A series of hydrolysis products, etc. These hydrolysis products can effectively remove molybdate, phosphate, arsenate, selenate and other metal and non-metal ions in water through electrostatic adsorption, surface complexation, co-precipitation, etc. Great removal. However, the price of ferric salt is relatively expensive. If a lower-priced ferric salt coagulant can be prepared, it will further promote the application of ferric salt coagulant in the field of water treatment. [0003] The price of divalent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/5236
Inventor 马军刘增贺张翔
Owner HARBIN INST OF TECH
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