SU831733A1 - Method of purifying alkaline aluminate solutions from impurities - Google Patents

Description

The invention relates to alumina production technology and can be used to purify aluminate solutions from impurities in the subsequent use of solutions of ³ thieves to extract gallium. ·

Known methods for cleaning aluminate solutions from impurities, including, as a rule, treating the solution with any reagent co-precipitating the impurity, for example with lime [1}.

However, with lime treatment, dilution of the solutions occurs, as well as significant losses of aluminum with calcium precipitate. fifteen

A known method of purification of alkaline aluminate solutions from impurities, including processing them with a reducing agent, followed by separation of low-20 soluble forms of impurities. Processing is carried out with finely ground aluminum powder. Moreover, such impurities, like vanadium and chromium, are reduced to the lowest degrees of valency and, due to their low solubility, precipitate [23.

However, the high cost of aluminum powder significantly limits the application of the method. thirty

The purpose of the invention is the reduction of the cost of the process.

This goal is achieved by the fact that as the reducing agent use an anode alloy - a product of three-layer refining of aluminum. The anode alloy contains, wt.%: 30-40 copper, up to 12 silicon, up to 3.9 iron, 0.20.3 gallium, the rest is aluminum.

Example. An initial solution containing, g / l: 0.432 gallium, 79.04 aluminum, 0.714 chromium oxide, 0.180 vanadium pentoxide and 0.016 iron oxide, in an amount of 1 l is placed in a reactor with a stirrer and treated with an anode alloy of 1.6 mm + 0 fraction, 05 mm for 2-6 hours. The alloy is dosed in an amount of 5-250 g / l of solution.

A fairly high degree of purification is observed: when the consumption of anode alloys exceeds 30 g per liter of solution. With an increase in alloy consumption, the filterability of precipitation improves. At an anode alloy consumption of 60 g per liter of solution, a filtrate of the following composition is obtained, g / l: 120., 6 aluminum oxide, 0.51 gallium, 0.005 chromium oxide, 0.0.06 iron oxide. Vanadium not found. The caustic module of the solution is 1.52. When carburizing gallium from a obtained solution of 0.5% aluminum gallam, gallium recovery is 59.8% with an aluminum consumption of 26 g per 1 g of gallium extracted.

After increasing the caustic module of the solution to 3.45 by strengthening it with an alkali solution, gallium recovery is 76.2%.

The use of an anodic alloy after three-layer refining of aluminum makes it possible to reduce the cost of purification of aluminate solutions from impurities and to utilize aluminum from the anodic alloy in alumina production.

Claims (2)

(54) METHOD FOR CLEANING ALKALINE ALKMINATE SOLUTIONS FROM IMPURITIES WITH 0.5% GALMA Aluminum, the extraction of gallium is 59.8% with an aluminum consumption of 26 g per g of isolated gallium. After increasing the caustic modulus of the solution to 3.45 by reinforcing it with a solution of 1eloch, the extraction of gallium is 76.2%. The use of anodic alloy after three-layer refining of aluminum makes it possible to reduce the cost of cleaning aluminate solutions from impurities and utilize the anomaly from anodic alloy to alumina production. Claims The method of cleaning alkaline alkylate solutions from impurities, including treating them with a reducing agent, followed by separating the slightly soluble forms of impurities from the solution, characterized in that, in order to reduce the cost of the process, anodic alloy is used as a reducing agent, a three-layer refining alkali. Sources of information taken into account during the examination 1. Zazubin A.I. and others. On the issue of cleaning aluminate solutions from impurities in the production of gallium. Proceedings of IM and OAN of the Kazakh SSR. 1972, Vol. 47 p. 29-33. 2. US Patent 3677918, class 204-105, 1972.