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INVENTION
Patent of the Russian Federation RU2134307
METHOD OF REMOVING NOBLE METALS FROM SOLUTIONS
The name of the inventor: Aleev RS; Dzhemilev U.M .; Dal'nova Yu.S .; Dmitriev Yu.K .; Kovtunenko SV; Shiryaeva OA; Khabibullin SG
The name of the patent holder: Institute of Petrochemistry and Catalysis of the Academy of Sciences of the Republic of Bashkortostan
Address for correspondence: 450075, Ufa, Prospekt Oktyabrya 141, Institute of Petrochemistry and Catalysis, Patent Group
Date of commencement of the patent: 1997.11.12
The invention relates to the field of hydrometallurgy of noble metals, in particular to methods for extracting gold, silver and platinum group metals from sorption solutions. The essence of the invention is the use as a sorbent of a new polymeric thioether, polydithiopropane, synthesized on the basis of trichloropropane by reaction with inorganic sulfide. The technical result is that the sorbent has a high sorption capacity in relation to gold and metals of the platinum group, which is equal to 0.2-1.0 g of recoverable metal per gram of sorbent.
DESCRIPTION OF THE INVENTION
The invention relates to the field of hydrometallurgy of noble metals, in particular to methods for extracting gold, silver and platinum group metals from sorption solutions.
In the gold mining industry of the CIS, an ion-exchange sorbent AM-2B is used to extract gold from cyanide solutions. Sorbent AM-2B possesses a high degree of gold recovery, but sorbent capacity at the rate is 4 mg of gold per 1 g of sorbent. The low capacity of AM-2B sorbent, which is usual for ion exchangers, is a disadvantage, because To extract large quantities of metal requires a multiply increased volume of sorbent.
Known heterochain organic compounds, mainly polymeric structure [Malofeeva GI. And others Izv. Universities, ser. "Chemistry and Chemical Technology", 1988, v. 31, c. 5, p. 3] , proposed for the concentration of a number of elements, including precious metals, for analysis. These sorbents are powders of a high degree of dispersion, which makes their use for technological purposes very problematic, Small powders clog the filters, self-seal in the packed columns, as a result of which the throughput of the equipment is lost. This drawback does not allow the use of known PTE in technological systems with large volumes of technological solutions.
The method closest to the claimed method, developed by Ron-Poulenc Industrials (France) [Application No. 2294239, France, 1976] , intended for the isolation of platinum group metals from acidic solutions, is closest to the claimed method. For the production of platinum metals by this method, acidic solutions are contacted in a flow column with an ion exchange sorbent "Duolite A 101D" , after which the sorbent concentrate is burned. In the ash remain metals in pure form.
The capacity of the "Duolite A 101D" sorbent is 1-50 mg of metal per gram of sorbent.
The main disadvantage of this process is the large consumption of the sorbent, which is to be burned after the sorption has ended. Burning large amounts of matter requires considerable energy input, because The ashing is carried out in electric furnaces at a temperature of 870 ° C. The reason for the large consumption of the sorbent is in the small capacity of the sorbent for the metal, due to the structure of the sorbent molecules.
This disadvantage - low metal capacity - is eliminated by using as a sorbent a new polymer thioether, polydithiopropane, synthesized on the basis of trichloropropane by reaction with inorganic sulphide.
The proposed polymeric thioester polyditiopropane (hereinafter referred to as PTPD ) is a porous granule that does not interfere with the flow of liquid in the column, it is easy to filter, they do not cake and do not cake under process conditions.
ACCEPT PTPN ON THE FOLLOWING METHODOLOGY
147.5 g (1 m) of a mixture of 1,1,2-, 1,2,2-, 1,1,1- trichloropropanes at any ratio of the isomers in the mixture are introduced into a solution of sodium sulfide taken in an excess amount against stoichiometry and Vigorously stirred for 6-8 hours at room temperature. The precipitated product precipitate is filtered off, washed with water on a filter, and dried. The melting point of the product is 230 ° C (dec).
Element composition
Found: C, 33.95;
H, 4.48;
S 61.15
Calculated for C 3 H 5 S 2 : C 34.29;
H, 4.76;
S 60.95
The yield of polydithiopropane is 80%.
To extract noble metals, the sorbent was contacted with a solution containing one or more metals of the platinum group, or gold, at different temperatures, in media of different acidity. After a predetermined time, the solid phase is separated from the liquid by filtration, the solid phase is washed with water, dried and niobium. In the filtrate and in the ash, the content of precious metals is determined, according to the analysis, the capacity of the sorbent is calculated.
PTPP showed a high sorption capacity in relation to gold and metals of the platinum group, equal to 0.2-1.0 g of recoverable metal per 1 g of sorbent.
Good filterability of granules of PTPP allows to use the sorbent in technological systems on an industrial scale. The high capacitance of PTPD for the elements of the platinum group and gold makes it possible to reduce the sorbent consumption in the process, which in turn leads to a reduction in energy intensity and, consequently, a reduction in the costs of the process. The advantage of FPTP is a wide range of temperatures and acidity of solutions, from which the extraction of precious metals occurs.
Example 1
In a model solution with a hydrochloric acid content of 1 mol / l , a content of platinum (in the form of chloroplatinic acid) of 100 mg / l , a sample of 500 g of PdTP sorbent is added and mixed for 6 hours at room temperature, after which a solid Phase by filtration. In the filtrate and in the solid phase, the platinum content was determined: platinum was absent in the filtrate, platinum 99 mg was found in the solid phase. The degree of extraction of platinum is 99% . The sorbent consumption is 5 g per 1 g of recoverable metal.
Examples 2-14
Carry out in a manner similar to Example 1 , but at different temperatures, pH of the medium and various initial concentrations of noble metals.
Data on the recovery of precious metals from aqueous solutions with the help of sorbent FPTP are presented in the table .
USED BOOKS
1. Malofeeva G.I. And others Izv. Universities, Ser .: Chemistry and Chemical Technology. - 1988, v. 31, c. 5, p. 3.
2. Application of France N 2294239, 1976.
CLAIM
A method for extracting precious metals from solutions, including sorption of precious metals on an organic compound and subsequent sorbent ashing, characterized in that polydithiopropane is used as the sorbent.
print version
Date of publication 05.12.2006гг
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