Method for silver flotation from acid cakes of zinc production

FIELD: metallurgy.

SUBSTANCE: method for silver flotation from acid cakes of zinc production involves introduction of a collecting agent - butyl xantate and a foaming agent - flotation oil to a flotation pulp of cakes. Prior to introduction of butyl xantate and flotation oil, pulp is subject to conditioning with tetrachloroethylene supplied in the form of water emulsion that has passed ultrasonic treatment.

EFFECT: increasing silver content in concentrate, which is achieved owing to removing elemental sulphur from mineral surface.

2 tbl, 1 ex

 

The invention relates to the beneficiation of minerals and can be used in the processing of sour Chekov zinc production.

Zinc concentrates coming from processing plants in metallurgical processing, after rasshifrovka undergo oxidative roasting, and then leaching in sulfuric acid. Leachate principal amount of zinc goes into solution, which after purification is sent to the electrolysis. The cake after leaching containing silver 200-400 g/ton processed using the Waelz process; however, the silver goes into clinker, which is copper-smelting plants being smelted together with copper concentrates [1]. The disadvantage of this method are large (up to 12%) loss of silver.

Loss reduction of silver can be achieved by carrying out the flotation sour Chekov zinc production [2].

The known method of flotation of silver from acidic Chekov zinc manufacture in which the flotation is carried out, using as reagent-collector of xanthate (flow rate of 250-300 g/t), and reagent-expander, fotomacro T-80 consumption of 40-60 g/t, the duration of flotation 10-15 minutes [3]. Validation of this method on different samples Chekov showed that the level of extraction of silver in the concentrate ranges from 30 to 70%, and the content of silver at the end of the waste after two peredishki ranges from 2 kg/t to 6.0 kg/t [2]. Such a large variation in the extract suggests that the level achieved for the recovery of silver depends primarily on the mineralogical composition (the ratio of kleivane and marmarica, copper and iron), zinc concentrates subjected to oxidative roasting before the leaching of zinc with sulfuric acid, as well as on the conditions of leaching. The undoubted disadvantage of this method is the low content of silver in the resulting flotation concentrates complicating them further processing. The low quality is due to the fact that in the leaching of zinc concentrates at the surface of minerals containing silver is formed elemental sulfur which, hydrophobicity surface minerals, leads to transition them into the foam product, resulting in the release of the concentrate increases and the content of silver in silver

the concentrate is reduced.

The technical result that can be obtained using the described method of increasing the content of silver in concentrate is achieved by removal of elemental sulfur from the surface of the minerals, non-native silver, by introducing into the process emulsified tetrachloroethylene, dissolving sulfur and thereby reduce photoactivity of these minerals.

Tetrachlorethylene - the devil is Vatan liquid, density of 1.6 g/cm solubility in water of 150 mg/DM3that is not flammable, is not selfigniting, non-explosive. Previously chlorethylene (trichlorethylene, perchlorethylene) was used in the flotation of talc as a reagent collector. [4]

The inventive method of flotation of silver from acidic Chekov zinc production, including the introduction into the pulp collector - butyl xanthate and expander - flotable, characterized in that before the introduction of the xanthate and the foaming agent to the slurry is subjected to conditioning with tetrachlorethylene, supplied in the form of an aqueous emulsion, held ultrasonic treatment.

Ultrasonic treatment promotes the emulsification of tetrachloroethylene, which leads to increase the effectiveness of its actions and reduction of the flow.

After the main flotation of coarse silver-containing concentrate is subjected to twice the cleaners. Feature of the proposed method is that the effect of tetrachloroethylene does not stop during roughing operations, increasing the content of silver in concentrate.

Tetrachlorethylene dissolve the elemental sulfur formed on the surface of minerals during leaching of zinc from zinc concentrates preventing the transition of minerals containing silver in concentrate. All this increases the efficiency of the allocation of sulfur is restorasi minerals and leads to higher silver content in the concentrate. The yield of the concentrate is reduced, and the extraction of silver in the flotation concentrate is maintained at that level.

Example

The proposed method was fluoroware acidic residues form containing zinc production zinc 14,54%, silver 320 g/t, sulfur total of 7.1%. Reagent and technological modes flotation corresponded recommended in [3], but in the operation of the conditioning of the pulp before flotation was additionally introduced tetrachlorethylene in the form of an aqueous emulsion, held ultrasonic treatment. The results of the experiments are presented in tables 1 and 2.

Analysis of the obtained data shows that pre-conditioning the pulp with tetrachlorethylene before flotation of silver-containing minerals leads to reduction of the yield of concentrate by reducing the content of minerals in which the silver is missing and enhance the content of silver in concentrate.

Literature

1. Romantei P., Fast VP metallurgy of heavy non-ferrous metals. Lead. The zinc. Cadmium: - M.: Publishing house Misa, 2010. - 575 C.

2. Chinkin V.B. have been Processing flotation concentrates zinc Chekov with the extraction of silver Tsvet No. 12. P.18-20. 2001.

3. Geykhman CENTURIES the Effectiveness of flotation in the processing of zinc Chekov Tsvet, 2000. No. 5. P.32-3.

4. Shubov L.Y. Flotation agents in the processes of mineral beneficiation // M.: Nedra, 1990, 400 S.

Method of flotation of silver from acidic Chekov zinc production, including the introduction of the flotation pulp from Chekov collector - butyl xanthate and expander - flotable, characterized in that before the introduction of butyl xanthate and the foaming agent to the slurry is subjected to conditioning with tetrachlorethylene, supplied in the form of an aqueous emulsion, held ultrasonic treatment.



 

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