SU1171089A1 - Method of cleaning anions from sulfides of heavy metals - Google Patents

Abstract

A METHOD FOR CLEANING ASHUNITS FROM SULFIDES OF HEAVY METALS by treating with an acidic solution of a chemical reagent, so that, in order to increase the degree of purification and acceleration of the process, a solution containing 25% is used as an acidic solution of the chemical reagent. 60 g / l of honey and 70150 g / l of sulfuric acid, and the treatment is carried out in two stages: at the first - at 80-95 ° C for 0.15-0.5 h, at the second - at IB-BO C for 16-26 hours

Description

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The invention relates to ion exchange technology, in particular, to a method for purifying and regenerating ion exchange materials in the process of recovering rare metals from solutions containing impurities of heavy non-ferrous metals, and can be used in rhenium production technology. The purpose of the invention is to increase the degree of purification of anion exchangers and accelerate the process. PRI me R. For cleaning, use is made of the anion exchanger AN-21-16P to be discharged from an industrial unit of rhenium production, containing 6.5% copper sulphide and 0.7% lead sulphide. The treatment of anion exchanger is carried out with a solution containing 10-80 g / l of copper and 40-200 g / l of sulfuric acid. In a column with a volume of 250 mm, I place 100 mm of a wet anion exchanger, pour it in an acidic solution of the reagent and process it in two stages: at the first one at ZO-YuO e B for 0.03-3 h and at the second at TZ-ZO C for 1036 h The transition from the first stage to the second is carried out by heating with deaf steam or cooling by bubbling air. After the time of purification, the anion exchanger is washed with water, treated with hydrochloric acid, then with cationic water, the dynamic exchange capacity of rhenium and the degree of purification are determined. The results of the experiment on the effect of different fshs

63 88 96 96 97 8.9. , 2 tori for exchange capacity for rhenium and degree of purification are given in the table. As follows from the above data, the optimal composition of the solution is 25-60 g / l of copper and 70-150 g / l of sulfuric acid. When the content of copper is up to 25 g / l, acid up to 70 g / l, the degree of purification is 52-90%, the capacity for rhenium is 6.3-9.2%. The copper content is above 60 g / l and the acid above 150 g / l is not economically feasible, since it does not lead to an improvement in purification. The optimal mode of the first stage: temperature 80-95 0, processing time 0.15-0.5 h. Treatment at a temperature of up to 80 ° C and a time of up to 0.15 h reduces the degree of purification to 33-89%, the capacity of anion exchange resin to 4, 65-9.10%. Warming up the pulp above and after 0.5 to 14 hours does not increase the sorption capacity of the ion exchanger. An increase in the processing time of more than 1 hour leads to a decrease in the capacity for rhenium to 7.55–8.4% as a result of thermal decomposition of the anion exchanger. The optimal mode of the second stage: temperature 18-30 ° С, processing time 16-26 h. Treatment with parameters below does not provide a positive effect (purification degree 72-90%, rhenium capacity 7.8-9.25 wt.% ). An increase in temperature from 30 to 40 s and a treatment time of more than 26 hours does not affect the quality of cleaning, at a temperature of 40 ° C, the rhenium capacity decreases to 6.55–8.7 wt.% Due to thermal destruction.

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Claims (1)

METHOD FOR CLEANING ANIONITHES FROM HEAVY METAL SULVES by treatment with an acidic solution of a chemical reagent, characterized in that, in order to increase the degree of purification and accelerate the process, a solution containing 25-60 g / l of honey and 70150 g / l of sulfuric acid is used as an acidic solution of a chemical reagent acid, and the treatment is carried out in two stages: in the first, at 80-95 ° C for 0.15-0.5 hours, in the second at 18-30 ° C for 16-26 hours SU w, 1171089 117,108.9.