SU651044A1 - Method of purifying zinc sulfate solutions - Google Patents

Description

(54) METHOD FOR CLEANING SULPHATE ZINC SOLUTIONS

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3. The reduction of metals proceeds according to the following equations: 2As +35204% - AS ° 46H50 + 6 .0--5b 6HS0 6 6204% 2 - 2I Rare metals (indium, gallium, cadmium) completely remain in solution, their further extraction can be carried out in a known manner by cementation with zinc dust, and this will allow yolochit rare metal concentrate with a high content of components. Example. Synthetic zinc sulphate solution containing (g / l): zinc - 100, mouse (S) 3.62, indium - 1, O, sulfuric acid 22, 0, sodium dithionite in dry form (TU MHP GHP 126 -56) in the amount of 4.5 g per 1 g of mouse (based on 320 / A5 1.3 to stoichiometry) and stirred at room temperature for 15 minutes. After filtration, the solution contains, g / l: zinc 1OO, mouse - 0, OOZ, indi g - 1.0, Degree of purification of the 6t solution of the mouse is 99.9% (sediment composition,%: mouse, - 78, sulfur total 13.5, moisture - 8.5). Example2. In zinc sulphate solution containing (g / l): zinc - 95, mpy (III) - 2.72, antimony (III) - O, O25, copper - 3.82, cadmium 0, 6, indie - 1.25, a solution of zinc dithionite is injected (concentration 520 2OOg / l in the amount of 7.7 g2p520. on 1 g of metals (calculation, Si6, Sb, Cu 1.4 to stoichiometry). The process is carried out analogously to Example 1, Extraction metals in the sediment amounted to,%: mouse to 99.95, copper - 10O, antimony - 99.9 composition of sediment,%: jth to - 32.4,

Claims (2)

antimony - O, 3, copper - 45.5, sulfur is total - 11.6, moisture - 10.2). As follows from the examples, the proposed method allows the purification of zinc sulphate solutions from such impurities as As, 5b, Cu almost completely. At the same time, rare metals, and especially indium, remain completely in solution, which will increase the yield. these metals. with further extraction. The method is carried out without heating, which greatly simplifies the process. At the same time, the process is less toxic since it is completely excluded. hydrogen sulfide division. Technical and economic indicators of the processing of sulfate zinc solutions using the proposed method of their purification will be significantly higher by eliminating the process of heating the solutions and increasing the extraction of indium from these solutions. Claim 1. Technique for cleaning sulphate zinc solutions from impurities by precipitation, characterized in that, in order to increase the selectivity of extracting rare metals from a solution, simplify the process and improve sanitary conditions, precipitation is carried out with dithionic acid salt. 2. The method according to claim 1, which is based on the fact that the salt of dithionic acid is taken in a ratio of 1.3-1.4 to the stoichiometrically necessary for the deposition of metals. Sources of information taken into account during the examination 1 USSR Copyright Certificate No. 464532, C Oiq 9/06, 1971.