SU814856A1 - Method of arsenates production - Google Patents

Description

The invention relates to a process for the preparation of arsenates used in the non-ferrous metallurgy and chemical industry as inorganic ion exchangers and compounds. A method is known for producing arsenates by the interaction of an alkali metal or mouse acid arsenate solution with the salts of the corresponding metals l1. The disadvantage of this method is that arsanate precipitates are formed as gels and require a long treatment time at a temperature of 1OO200 ° C to crystallize them. The closest in technical and achievable result to the proposed is a method of obtaining copper, nickel, iron, and titanium arsenates from mouse-containing solutions by treating them with hydroxides of metal with an aftertreatment of Ossack and drying process. The disadvantage of this method is the low degree of precipitation of the product: for copper arsenate - 17% in 60 minutes, for titanium arsenate - 4% in 30 minutes. The purpose of the invention is to increase the degree of precipitation of the product: copper arsenate is up to 39-63% for 6O min, for iron arsenate - up to 89-95% for 13 min, DLI nickel arsenate - up to 93-98% for 2 min, for titanium arsenate - up to 2992% for 6O minutes This goal is achieved by the method of obtaining arsenate from mouse-containing solutions by treating them with metal compounds, followed by separating the precipitate by drying the product, the metal compounds being taken in a crystalline form and the treatment is carried out for 30-120 minutes with stirring. In addition, in order to obtain arsenates of copper, nickel, iron, and titanium, HYDROXIDE or oxide of copper, nickel, iron, 3 gnanil sulfate and ammonium or tigane hydroxide are used as metal compounds. The distinctive features of the method are as follows: the metal compounds are taken in crystalline form and the treatment is carried out for 30-minutes while stirring. An additional distinguishing feature is that hydroxide or oxide of copper, nickel, iron, titanyl sulfate and ammonium or titanium hydroxide are taken as metal compounds. The use of these compounds in crystalline form in combination with the treatment of mouse-containing solutions for SO-12O min creates the necessary concentration of crystallization centers in the solution and contributes to the formation of coarse, rapidly precipitating and easily filtering precipitates of metal arsenates. S6 Reducing the processing time to less than 30 minutes leads to a dramatic decrease in the degree of precipitation of the product. Increasing the processing time to more than 120 minutes is impractical because it does not lead to a further increase in the degree of precipitation of the product. The essence of the method is illustrated by the following example. Example. 1OO ml of electrolyte containing sulfuric acid and sulfuric acid is treated with metal compounds for 120 minutes with vigorous stirring, which is continued for 60 minutes after the end of treatment. The temperature of the solutions, at the end of the experiment, controls the degree of precipitation of the solid phases. The dependence of the degree of precipitation of the product on the processing time is given in Table.

Claims (2)

The proposed method allows to increase the degree of precipitation of the product, shorten the time of settling, facilitate the filtration process due to the formation of coarse crystalline arsenates, which in turn will increase the productivity of labor. In addition, the method makes it possible to obtain solid metal arsenates used in the chemical industry as inorganic ion exchangers for such cations as Na. K, Pt) Cs Ca, SH. Claim 1. The method of obtaining arsenates is washed out of the containing solutions by treating them with metal compounds, followed by separating the precipitate and drying the product, characterized in that, in order to increase the degree of precipitation of the product, the metal compounds are taken in a crystalline form and are treated for 30-120 min with stirring. 2. The method according to claim 1, characterized in that, with c & 5 8148566 arsenates of copper, nickel, iron and titanium,} l.Demaret A.DJvire F ,. Bute, for metal pinning, take Soc.cbim. France, 1974, No. C, p. 2335. hydroxide or oxide of copper, nickel, iron, titanyl sulfate and ammonium or hydroxide-2. Beilina A. 3. et al. On physical and chitrooxide of titanium. 5 mical properties of copper arsenates Sources of information, Journal of Physical Chemistry. 1971, t. 51, taken into account in the examination. 2, P.48O-482.