CN-121976051-A - Enrichment method of rare noble metals in hot filter residues

CN121976051ACN 121976051 ACN121976051 ACN 121976051ACN-121976051-A

Abstract

The invention relates to an enrichment method of rare noble metals in hot filter residues, which comprises the steps of cooling the hot filter residues after sulfur production to room temperature, crushing and grinding, then placing the ground hot filter residues into a Soxhlet extractor, distilling and eluting by taking carbon disulfide as eluent until the quality of the hot filter residues is unchanged, filtering to obtain eluted hot filter residues and sulfur-containing filtrate, drying the eluted hot filter residues to obtain enriched rare noble metal filter residues, evaporating the sulfur-containing filtrate to obtain high-grade sulfur solids, condensing the evaporated carbon disulfide, and refluxing the condensed carbon disulfide to the Soxhlet extractor. The invention has simple process, and the obtained rare noble metal concentrate has high quality and recovery rate, and the enriched rare noble metal concentrate can directly enter a rare noble metal production line.

Inventors

SONG JIANWEN
LIU XINGJUN
AN ZHIWEI
ZHENG QINGSHAN
YANG JIARUI
FAN DONGQING
MA KEBIN

Assignees

金川集团永昌铜业有限公司
金川集团铜贵股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260127

Claims (4)

1. A method for enriching rare noble metals in hot filter residues is characterized by comprising the steps of cooling the hot filter residues after sulfur production to room temperature, crushing the hot filter residues to 2mm, grinding the hot filter residues to-325 meshes to account for 90%, then placing the ground hot filter residues into a Soxhlet extractor, distilling and eluting by taking carbon disulfide as eluent until the quality of the hot filter residues is unchanged, filtering the hot filter residues to obtain eluted hot filter residues and sulfur-containing filtrate, drying the eluted hot filter residues to obtain enriched rare noble metals filter residues, evaporating the sulfur-containing filtrate to obtain high-quality sulfur solids, and condensing the evaporated carbon disulfide and refluxing the condensed carbon disulfide to the Soxhlet extractor.
2. The method for enriching rare and noble metals in hot filter residues according to claim 1, wherein the mass percentage of sulfur in the hot filter residues is 45% -60%, the content of the rare and noble metals is 100-150 g/t of gold, 50-100 g/t of silver, 100-150 g/t of platinum and 200-250 g/t of palladium.
3. The method for enriching rare and noble metals in hot filter residues according to claim 1, wherein the distillation elution temperature is 45-55 ℃.
4. The method for enriching rare and noble metals in hot filter residues according to claim 1, wherein the temperature of the eluted hot filter residues is controlled to be 40-50 ℃.

Description

Enrichment method of rare noble metals in hot filter residues Technical Field The invention relates to the technical field of mineral processing, in particular to a method for enriching rare noble metals in hot filter residues. Background The hot filter residue is tailings obtained after sulfur is produced from nickel anode slime through airing, screening and sulfur melting, is an intermediate product of nickel anode slime treatment, and is rich in a large amount of rare noble metal resources. Because the content of the rare noble metal does not reach the minimum standard of the rare noble metal production line, the rare noble metal cannot be recycled in the rare noble metal production line. In order to improve the resource utilization rate and the enterprise benefit, the method for treating the hot filter residues at the present stage returns to a smelting furnace for cyclic smelting, but the method has three obvious defects that firstly, rare noble metals are scattered more or less in a smelting system in the cyclic smelting process, so that the direct yield of the rare noble metals is not high, secondly, the metallurgical energy consumption is increased during repeated cyclic smelting, the production cost is increased, and finally, because the hot filter residues contain 40 percent of sulfur, more sulfur dioxide gas is generated in the cyclic smelting process, the load of a sulfur dioxide treatment system is increased, and the sulfur dioxide treatment quality is influenced. Therefore, it is important to find a method for enriching rare noble metal resources in hot filter residues. Disclosure of Invention The invention aims to provide a simple and efficient enrichment method of rare noble metals in hot filter residues. The method is characterized in that the hot filter residue after sulfur production is cooled to room temperature, crushed to 2mm and ground to minus 325 meshes to account for 90%, the ground hot filter residue is put into a Soxhlet extractor, distilled and eluted by taking carbon disulfide as eluent until the quality of the hot filter residue is unchanged, eluted hot filter residue and sulfur-containing filtrate are respectively obtained after filtration, the eluted hot filter residue is dried to obtain enriched rare and noble metal filter residue, the sulfur-containing filtrate is evaporated to obtain superior sulfur solid, and the evaporated carbon disulfide is condensed and then flows back into the Soxhlet extractor. The mass percentage of sulfur in the hot filter residue is 45% -60%, the rare noble metal content is 100-150 g/t of gold, 50-100 g/t of silver, 100-150 g/t of platinum and 200-250 g/t of palladium. The distillation elution temperature is 45-55 ℃. And controlling the temperature of the eluted hot filter residue at 40-50 ℃. Compared with the prior art, the invention has the following advantages: 1. The invention uses carbon disulfide as eluent to be evaporated, condensed and recycled, and the energy consumption required by the evaporation and condensation of the carbon disulfide is low, thereby being more environment-friendly. 2. The method enriches rare noble metals in the hot filter residues, simultaneously has no byproduct which cannot be treated in the middle, and eluted sulfur is a superior industrial product. 3. The invention has simple process, and the obtained rare noble metal concentrate has high quality and recovery rate, and the enriched rare noble metal concentrate can directly enter a rare noble metal production line. Drawings The following describes the embodiments of the present invention in further detail with reference to the drawings. FIG. 1 is a process flow diagram of the present invention. Detailed Description As shown in fig. 1, the method for enriching rare noble metals in hot filter residues comprises the steps of cooling the hot filter residues after sulfur production to room temperature, crushing the hot filter residues to 2mm, grinding the hot filter residues until the hot filter residues occupy 90% of minus 325 meshes, then placing the ground hot filter residues into a Soxhlet extractor, distilling and eluting the hot filter residues by using carbon disulfide as eluent at 45-55 ℃ until the quality of the hot filter residues is unchanged, filtering the hot filter residues to obtain eluted hot filter residues and sulfur-containing filtrate at 40-50 ℃, drying the eluted hot filter residues at 70-80 ℃ until the weight of the eluted hot filter residues is constant, obtaining enriched rare noble metal filter residues, evaporating the sulfur-containing filtrate to obtain superior sulfur solids, condensing the evaporated carbon disulfide, and refluxing the condensed carbon disulfide into the Soxhlet extractor. Wherein the mass percentage of sulfur in the hot filter residue is 45% -60%, the rare noble metal content is 100-150 g/t of gold, 50-100 g/t of silver, 100-150 g/t of platinum and 200-250 g/t of palladium. Because the hot filter residue also contains