RU2350666C2 - Complex method for recycling of slags - Google Patents

Abstract

FIELD: technological processes; metallurgy.

SUBSTANCE: invention is related to ferrous and non-ferrous metallurgy, namely to recycling of slags and ash-and-slag wastes. Method for slags recycling for extraction of valuable components includes magnetic separation and gravitational enrichment with production of concentrate and rewash discard. Rewash discard after enrichment are exposed to cavitation processing and biohydrometallurgical redistribution, which provides for additional extraction of valuable components available in slag matrix. Recycling is carried out by means of bacteria growing to concentration of 10³-10⁵ cells per 1 ml, addition of rewash discard to solution with bacteria in the ratio of T:Zh=1:5 and development of bacteria cultures to concentration of 10⁷ cells per 1 ml. In process of recycling permanent aeration is carried out at medium temperature of 15-32°C. Valuable components are extracted from produced solution.

EFFECT: higher efficiency of slag and ash-and-slag wastes recycling.

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Description

The invention relates to ferrous and non-ferrous metallurgy, namely the processing of slag and ash and slag waste.

A known method of processing ash and slag waste, including magnetic separation to separate the iron-containing concentrate from ash, screening with the release of quicklime, ash gravel and sand, followed by separation of heavy metals from sand by gravity, separation of sand and coal by electrical conductivity. RU No. 2206626, IPC С22В 7/02, 2003

The disadvantages of the known method of processing ash and slag waste are the low degree of extraction of valuable components and high energy costs.

The task to which the proposed solution is aimed is to increase the efficiency of processing ash and slag and slag waste.

The aforementioned drawback is eliminated by the fact that a comprehensive method of slag processing, including magnetic separation, gravity enrichment, also contains a biohydrometallurgical redistribution, providing additional extraction of valuable components, for example, those present in the slag matrix, including the cultivation of bacteria to a concentration of 10 ³ -10 ⁵ cells per 1 ml, cavitation treatment of slags, their addition to a solution with bacteria in the ratio T: W = 1: 5, development of cultures on slags to a concentration of 10 ⁷ cells / ml with constant aeration, etc. and a medium temperature of 15-32 degrees Celsius, the subsequent extraction of valuable components from the solution.

The essence of the method is as follows. Concentrate is obtained from slags containing valuable components by gravity enrichment and magnetic separation, and tailings containing difficult to remove valuable components contained in the slag matrix are subjected to a further biohydrometallurgical processing method, including the cultivation of bacteria in an elective solution to a concentration of 10 ³ -10 ⁵ cells per / ml, the addition of slag pretreated in the cavitation field in the ratio S: L = 1: 5, in the development of cultures slag to a concentration of 10 ⁷ cells in / ml, leaching tse GOVERNMENTAL components in solution in a static mode with a periodic change of the solution and a constant aeration at a temperature of 15-32 ° C with subsequent isolation of valuable components of the solution.

Example.

During ore processing (Trepecha, Yugoslavia) through gravity concentration and magnetic separation, a concentrate with a lead content of 62% was obtained. Processing tailings containing 38.7% iron oxide and 5.8% zinc were subjected to a biohydrometallurgical redistribution, including the cultivation of bacteria of the T-5YUSH complex in RP medium (proprietary) to a concentration of 10 ³ -10 ⁵ cells per 1 ml, then added previously the tailings of the screw lock of the fraction processed in the cavitation field, 0.5-0.8 mm, containing 38.7% iron oxide and 5.8% zinc in the ratio T: W = 1: 5, cultures were developed on slags to a concentration of 10 ⁷ cells per ml. Leaching occurred in a static mode with periodic change of solution, constant aeration at an ambient temperature of 15-32 ° C and the subsequent release of zinc, iron-containing sediments in the form of transparent pigments. The solid residue after the extraction of zinc and iron-containing components is a good raw material for paving and construction. Iron-containing precipitates are nanopowders of transparent pigments and are a valuable material in the paint and varnish, automotive and cosmetic industries.

From an environmental point of view, this method of processing slag and ash and slag waste is today the cleanest production.

Claims (1)

A method of processing slag for the extraction of valuable components, including magnetic separation and gravity enrichment to obtain concentrate and tailings, characterized in that the tailings after enrichment are subjected to cavitation treatment and biohydrometallurgical redistribution, which ensures the recovery of valuable components present in the slag matrix by growing bacteria to concentration 10 ³ -10 ⁵ cells per 1 ml, adding tails to the solution with bacteria in the ratio T: W = 1: 5 and developing bacterial cultures to a concentration and 10 ⁷ cells per 1 ml with constant aeration and at an ambient temperature of 15-32 ° C to obtain a solution and with the subsequent isolation of valuable components from the solution.