SU880999A1 - Method of purifying arsenic-containing solutions - Google Patents

Description

one

The invention relates to the purification of alkaline solutions from arsenic and can be applied in non-ferrous metallurgy enterprises.

A known method of purification of thermal and natural waters, having a pH value of 3-10, from the mouse by contacting the initial solution with granular gel freezing with iron hydroxide 1.

The complexity of obtaining granular sorbent is a disadvantage of the proposed method.

A known method of cleaning mouse-containing wastewater by treatment with a mixture of activated carbon and ferric chloride. The resulting precipitate is dried at 750-800 ° C, blowing air through it 2.

However, the complexity and high cost of sludge treatment limit the widespread use of this method.

The closest in technical essence to the invention is a method for cleaning arsenic-containing solutions, which includes treating water with an iron-containing sorbent obtained from red mud — waste from alumina production at pH 3–8. Effective cleaning is achieved with

The initial concentration of the mouse is 50100 mg / l 3.

The disadvantage of this method is that the sorbent obtained from red mud does not provide effective purification of highly concentrated mouse-containing solutions and preliminary neutralization is necessary if the pH of the solution is 8.

ten

The purpose of the invention is to increase the degree of purification of concentrated alkaline solutions.

The goal is achieved by

15 that the cleaning of concentrated alkaline mice with a solution containing an iron-containing sorbent, which is an intermediate product of zinc production of the following composition, weight. %:

Iron hydroxide 45-52 Aluminum hydroxide 1-3 Zinc hydroxide 13-20 Water25-30

25

Preferably, the cleaning is carried out at a ratio of mouse to solution containing: an intermediate zinc production of 3-4.4: 1.

The method is carried out as follows.

The alkaline mouse-containing solution is poured into a tank with a stirrer, where the iron-containing sorbent is also introduced in an amount at which the solution: sorbent ratio is 3-4.4: 1. After mixing, the slurry is filtered and the filtrate is discharged to the drain.

PRI me R. A tank containing a mouse content of 3840 mg / l and a pH of 12.5 (total alkalinity of 950 mg / eq / l, free of 535 mg eq.) And an iron-containing sorbent - an intermediate product of zinc production, containing iron hydroxide 51 %, aluminum hydroxide 2%, zinc hydroxide 20% and water 27%, in an amount of 233 ml / l (solution: adsorbent ratio of 4.3). The mixture is heated with stirring to 70 ° C. After mixing, the pulp is filtered. The content of the mouse in the filtrate is 0.9 mg / l, pH 7.75. I

The proposed method allows effective cleaning of alkaline waste water from the mouse with a mouse content of up to 3-5 g / l and a pH of 12-13. It is simple to perform, inexpensive.

Claims (3)

1. A method for cleaning mice with kc-containing solutions, which includes treatment with an iron-containing sorbent, characterized in that, in order to increase the degree of purification of concentrated alkaline solutions, zinc production of the following composition is used as a sorbent, wt. %: Iron hydroxide 45-52 Aluminum hydroxide 1-3 Zinc hydroxide 13-20 Water25-30 2. A method according to claim 1, characterized in that the cleaning is carried out at a solution: solution ratio of zinc production 3-4.4: 1. Sources of information taken into account in the examination 1. USSR author's certificate number 374232, cl. From 02 To 1/14, 1973. 2. Patent of CPP number 90849, cl. From 01 to 27/02, 1976. 3. Kazantsev E.I., Stepanenko E.K. Gerasimenko A.N. Wastewater treatment waters from mice using sorption method. Colored metals, 1974, No. 9, p. 18-20.