Method of a ferric iron hydroxide hydrosol production

FIELD: chemical industry and agriculture; production of hydrosol of ferric iron hydroxide.

SUBSTANCE: the invention is intended for a chemical industry, an agriculture and pedology and may be used at production of solutions for soils reclamation. 0.5 l of a ferric chloride solution with concentration of 0.5 l/mole gram-molecule is poured into a pan. Carbon electrodes are put into the solution. Pass a current of 1А. Each 5-60 seconds polarity of the electrodes is changed. In a result of replacement of anions of the salt for ions of the hydroxyl obtain a stable hydrosol of the ferric iron hydroxide. The invention allows to produce such sols using a simple and a production-friendly method commercially.

EFFECT: the invention allows to produce such sols using a simple and a production-friendly method commercially.

6 ex

 

The invention relates to agriculture and soil science, namely to methods of obtaining solutions for soil reclamation.

A method of obtaining Zola hydroxide, iron [1], which consists in the treatment of a solution of ferric chloride anion-exchange resin in the Oh form. In a solution of ferric chloride added portions anion exchange resin so that the amount of added ion exchange resin does not exceed 20-30% of the total system. Upon reaching the specified ratio of the resin is filtered off and the solution add a new portion of the anion. The filtered resin regenerate the alkaline solution. The process continues until receipt Zola, possessing the desired properties.

The main disadvantages of this method are its low-tech and labor costs associated with the need to use anion-exchange resin in the form of a suspension, filter it and regenerate. Attempts to conduct the process in a continuous mode using ion-exchange columns gave no positive result due to coagulation of colloidal particles Zola in columns and deposition of particles on the resin type.

The aim of the invention is to develop a simple and feasible method of obtaining a Sol of ferric hydroxide.

The problem is solved by replacing the anion of the salt ions to hydroxyl, and replacement perform the ay electrolysis of a solution of ferric chloride, conducting switching the polarity of the electrodes every 5-60 seconds.

The technical essence of the invention consists in carrying out the electrolysis of aqueous solutions of ferric chloride, and in the process of electrolysis carried out switching the polarity of the electrodes every 5-60 seconds.

The proposed method by electrolysis to obtain a stable sols of ferric hydroxide, which greatly simplifies getting sols compared to an ion exchange method using a granular anion exchange resin and gives you the opportunity to get these sols in large quantities.

The following examples disclose the essence of the proposed invention.

Example 1

A solution of ferric chloride (0.5 l) concentration of 0.5 mol/l was poured into a cuvette size 15×7×10 see the solution was placed carbon electrodes and was passed through the solution current of 1 A. the polarity Switch is not performed. In the formed iron hydroxide (3) allocated to the cathode, and Sol I couldn't get.

Example 2

A solution of ferric chloride (0.5 l) concentration of 0.5 mol/l was poured into a cuvette size 15×7×10 see the solution was placed carbon electrodes and was passed through a solution of the current force 1 A. switching the polarity of the electrodes was carried out with an interval 70-90 sec. The result was a partial allocation hydroxide, as is ESA (3) on the electrodes, although to a much lesser extent than without changing the polarity of the electrodes.

Example 3

A solution of ferric chloride (0.5 l) concentration of 0.5 mol/l was poured into a cuvette size 15×7×10 see the solution was placed carbon electrodes and was passed through a solution of the current force 1 A. switching the polarity of the electrodes was performed with an interval of 60 seconds. In the result there was no allocation of hydroxide of iron (3) on the electrodes and was able to obtain a stable Sol.

Example 4

A solution of ferric chloride (0.5 l) concentration of 0.5 mol/l was poured into a cuvette size 15×7×10 see the solution was placed carbon electrodes and was passed through a solution of the current force 1 A. switching the polarity of the electrodes was carried out with an interval 15-16 sec. In the result there was no allocation of hydroxide of iron (3) on the electrodes and was able to obtain a stable Sol.

Example 5

A solution of ferric chloride (0.5 l) concentration of 0.5 mol/l was poured into a cuvette size 15×7×10 see the solution was placed carbon electrodes and was passed through a solution of the current force 1 A. switching the polarity of the electrodes was carried out with an interval of 7-8 seconds. In the result there was no allocation of hydroxide of iron (3) on the electrodes and was able to obtain a stable Sol.

Example 6

A solution of ferric chloride (0.5 l) concentration of 0.5 mol/l was poured into a cuvette size 15×7×10 see RA the solution was placed carbon electrodes and was passed through the solution current of 1 A. Switching the polarity of the electrodes was carried out with an interval of 5 sec. In the result there was no allocation of hydroxide of iron (3) on the electrodes and was able to obtain a stable Sol, but the process slowed down due to the fact that a significant portion passing through a system of electric current spent in the depolarization of the electrical double layer. Visual observation of the electrolysis process for the allocation of gas at the electrodes indicate that the emission starts after about 3 seconds after switching polarity, and becomes stable after 5-6 seconds.

The results obtained suggest that if you switch the polarity of the electrodes every 5-60 seconds, it is possible to obtain a stable colloidal solution of hydroxide of iron (3).

Thus, the alleged invention allows to obtain sols hydroxide, iron (3) from solutions of ferric chloride is quite simple and manufacturable method is electrolysis.

Literature

1. Balls FU Cryochemical synthesis of fine oxide powders using ion exchange processes. Descendin. Sciences. M.: Moscow state University, 1991, 122 S.

The way to obtain a Hydrosol of ferric hydroxide, which consists in replacing the anions of the salt ions to hydroxyl, characterized in that the replacement is carried out by electrolysis of a solution of ferric chloride, etc is leading switching the polarity of the electrodes every 5-60 C.



 

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