Method for processing gold-arsenic sulfide materials

 

(57) Abstract:

The invention relates to the processing of refractory gold-arsenic materials, in particular gold-arsenic antimony sulfide materials. The problem to which the invention is directed, - improving the efficiency of the recycling process. Technical result achieved include increased recovery of valuable components in single-stage mode processing while ensuring safe environmental conditions. For this purpose, the method for processing gold-arsenic sulfide materials, including smelting the slag and matte, removing volatile sulfide gases and the recovery of gold in Stein, conduct evacuation matte. In the process of degassing Stein washed extract phase from the metal lead or antimony. The process is carried out at a temperature above the melting temperature of the matte. table 1.

The invention relates to the process of extracting precious metals from refractory gold concentrates and ores, in particular of gold-arsenic sulfide materials.

The known method of vacuum-thermal distillation of arsenic and sulphur of gold-arsenic concentrates in neutral atmosf the Vacuum thermal removal of arsenic from gold-bearing concentrates Yakutia// non-ferrous metals. - 1999. - 4. -S. 9-11/.

The disadvantage of this method is the complexity of vacuum technology in industrial conditions in connection with bulky gas purification system and the complexity of the further processing because of its mnogostadiinost (roasting, smelting, converting, refining, and so on ) and, as a consequence, the difficulties of compliance with environmental security.

Closest to the claimed method is vacuum arsenic sulfide concentrates, including firing and subsequent melting candle on matte and slag extraction in matte gold and silver. /Isakov, R. A. , Ladadika centuries , Chelokhsaev HP, etc. //Complex usage of mineral raw materials. -1989. - 7. -S. 39-42/ prototype.

The disadvantages of this method is that it is two-stage (roasting-smelting), environmentally unsafe due to receive a large volume of exhaust gas when firing with a large content of oxides of arsenic. To neutralize their harmful impact of existing methods is difficult and associated with high capital and operating costs. Furthermore, the method provides enough high recovery of valuable components in Stein (94,4 - silver and 98.4 - gold).

The task on which ovestin materials.

Achievable technical result is to increase the recovery of valuable components implemented in one stage, and improvement of the ecological situation in the implementation process.

The technical result is achieved by the fact that in the known method for processing gold-arsenic sulfide materials, including smelting the slag and matte with removing volatile sulfide compounds from gases and recovery of gold in matte, according to the invention Stein subjected to vacuum with washing retrieve the gold phase of metallic lead or antimony.

The analysis of prior art on this issue was not identified counterparts, the set of features which would be identical to all characteristics of the present invention, which allows to judge the criterion of "novelty."

From a certain applicants prior art there have been no known effect provided essential features of the invention transformations on the achievement of the technical result. Therefore, the proposed solution meets the condition of patentability "inventive step".

The method is carried out following the second vacuum chamber, where is the distillation of volatile compounds of arsenic and antimony and rinsing matte metallic lead or antimony to extract gold. Extracting the phase from the downstream, i.e. metal wire is removed for further processing to extract antimony and gold, and Stein, if necessary, subjected to a secondary vacuum processing for control of distillation is dissolved in the matte in the process of leaching of antimony or lead. Of the gases from the vacuum metal compounds and sulfur consistently separately deposited in the respective capacitors. The process is conducted at a temperature above the melting temperature of a Stein.

Stein, arsenic, antimony, gold, subjected to vacuum treatment for a deeper removal of metals in the finished products with high degree of extraction. When washing matte (gold-bearing iron sulfide) extracts the phase she is not infected other impurities, and therefore, further processing of the extract phase is facilitated, since it is limited to one stage.

This method of processing refractory gold-bearing sulfide material allows almost one stage to separate valuable metals on self middlings.ideological atmosphere, as the technology is implemented in a single technological tight complex without the outer circulation of the melt.

Example.

Processing was subjected to sulfide concentrate of the following composition, %: As - 4,75; Sb - 4,30; S - 18,3; Fe - 28,8; SiO2and 15.3; Cao - 9,6; Al2O3to 2.35; Mao - 2,0; Au - 130 g/so

Concentrate smelting was carried out at a temperature of slag 1400oWith consumption and limestone based 46 kg per 1 ton of concentrate. The output of slag - 32,0% primary Stein - 41,0%. The results are shown in the table.

From the results of the table shows that the two-stage processing of hard materials gold replaced almost single-stage low-flow fluxing materials and higher extraction of antimony and gold (98,4% on prototype and 99,81 - claimed method).

Thus, compared with the prototype of the vacuum in the present method reduces the formation of intermediates, i.e., increases the extraction of gold, which they had lost, and thereby reduces capital and operating costs for processing hard materials gold. When washing matte extraction phase, the latter is not infected other impurities and hence recycling easier, orererbobo in General compared to the prototype.

The present invention is intended for use in industry. Material description confirmed the possibility of its implementation using the proposed methods and tools that can provide the above technical result. Therefore, the proposed solution meets the criteria of the invention "industrial applicability".

Method for processing gold-arsenic sulfide materials, including smelting the slag and matte with removing volatile sulfide compounds from gases and recovery of gold in Stein, characterized in that the matte is subjected to vacuum with washing retrieve the gold phase of metallic lead or antimony.

 

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