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Method for recovering rhenium from arsenic filter cake
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A filter cake, potassium perrhenate technology, applied in the direction of improving process efficiency, can solve the problems of high cost, long process, low rhenium recovery rate and the like, and achieve the effects of low cost, short process and short processing process
Inactive Publication Date: 2012-05-02
HUNAN RES INST FOR NONFERROUS METALS +1
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[0005] (1) The process is long and the cost is high: since the arsenic content in the arsenic filter cake is as high as 20%, the arsenic must be treated in the process of extracting rhenium, and the copper sulfatereplacement method is used to extract rhenium, which requires two times in the process of processing When copper sulfate solution is used, As is generated twice 2 o 3 , the process flow is long, and the processing of ltAs 2 o 3 It needs to consume 2 tons of copper powder, and the direct processing cost of processing 1 ton of arsenic filter cake exceeds 6,000 yuan
[0006] (2) A large amount of oxidation and washing residue is difficult to deal with: more than 1.2 tons of washing residue is produced when 1 ton of arsenic filter cake is processed, and the water content of the residue is high, so it is difficult to directly return to the copper pyromelting system
[0007] (3) The recovery rate of rhenium is low: in the process of processing, the recovery rate of rhenium is only 88%
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Embodiment 1
[0065] Using arsenic filter cake from a domestic copper smelter as raw material, the main components (mass content) are Re: 1580-1620g / t, As: 20.0%-21.5%, S: 53%-55%, Se: 1.8%- 1.9%, Bi: 2.9%-3.2%, Cu: 1%-1.5%, Pb: 2.5%-2.8%, and the rest are impurities.
[0066] In one leaching process, sodium hydroxide with 50% raw material amount is added, the liquid-solid ratio is controlled at 3:1, the leaching temperature is controlled at 90° C., and the leaching time is 4 hours. The leaching rate of rhenium is 94%, the leaching rate of arsenic is 98%, the leaching rate of selenium is 3%, and the lead, bismuth and copper are enriched in the leaching slag. scum.
[0067] Add 25g / L sodium hypochlorite to the first-stage leaching residue for second-stage leaching, control the liquid-solid ratio to 3:1, control the leaching temperature to 60°C, leaching time to 2h, and control the solution oxidation potential to ≥200mv. In the second-stage leaching process, the leaching rate of rhenium is ...
Embodiment 2
[0073] Using arsenic filter cake from a domestic copper smelter as raw material, the main components (mass content) are Re: 1580-1620g / t, As: 20.0%-21.5%, S: 53%-55%, Se: 1.8%-1.9 %, Bi: 2.9%-3.2%, Cu: 1%-1.5%, Pb: 2.5%-2.8%, and the rest are impurities.
[0074] In one leaching process, 60% of the raw material amount of sodium carbonate is added, the liquid-solid ratio is controlled at 4:1, the leaching temperature is controlled at 95° C., and the leaching time is 5 hours. The leaching rate of rhenium in one-stage leaching process is 92%, that of arsenic is 96%, that of selenium is 1%, and that lead, bismuth, and copper are enriched in the leaching slag. scum.
[0075] About 27% hydrogenperoxide is added to the first-stage leaching residue to carry out the second-stage leaching, the liquid-solid ratio is controlled to be 4:1, the leaching temperature is controlled at 80°C, the leaching time is 4h, and the oxidation potential of the solution is controlled to be ≥200mv. In t...
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Abstract
The invention provides a method for recovering rhenium from an arsenicfilter cake. The method comprises the following steps: entering rhenium, arsenic and sulfur into a solution by adopting one-section alkali leaching and second-section oxidization and leaching, and simultaneously enriching lead, bismuth, copper and selenium in leaching slag; in the one-section leachate, converting rhenium into perrhenate in a form of sodium thioperrhenate by adopting an oxidization method, converting sodium thioarsenate into sodiumarsenate, and separating out sulfur in a form of simple substance sulfur; removing arsenic from the solution obtained by oxidization conversion by using a sulfur dioxide reduction method or lime method; carrying out rhenium enrichment on the solution obtained after arsenic isremoved; treating a rhenium reextraction liquid by using a potassiumchlorideprecipitation method to obtain crude potassiumperrhenate; and refining crude potassiumperrhenate to obtain potassium perrhenate. The method has short process flow, high rhenium recovery rate and low treatment cost; and by using the method, the comprehensive utilization of valuable metals in the arsenic filter cake canbe realized.
Description
technical field [0001] The invention belongs to the technical field of nonferrous metallurgy and environmental treatment, and relates to a new method for recovering rhenium from arsenic-containing materials, in particular to recover rhenium by using arsenic filter cake produced by a pyrometallurgycoppersmeltingacid productionsystem as a raw material. Background technique [0002] The main raw material for extracting rhenium: There are few individual rhenium minerals in nature. It mainly exists in molybdenite in the form of sulfide, and molybdenite often coexists with coppersulfide ore. During the mining process of copper sulfide ore, rhenium is enriched in copper sulfide concentrate and brought into the copper pyro-smeltingsystem. During the pyro-smelting process of copper, more than 82% of rhenium volatilizes into the waste acid stock solution of the flue gas acid system, and more than 94% of it enters the arsenic filter cake in the form of sulfide. Rhenium also exis...
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