Preparation method of ferric salt solution

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 ...

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

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