http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-460183-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1cb1a9c62b476691555964474aae576b http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e1389da273e6cde38146870bc914feae http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ea39fed2ead093f5baca6763bd38d7ad http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_4dec1e676531e8b68fb8f7ebe0d15d75 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C22B11-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C22B11-08 |
| filingDate | 1935-06-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1937-01-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-460183-A |
| titleOfInvention | Improvements in or relating to metallurgical processes for the recovery of metals from ores |
| abstract | To recover precious metals from ores a pulp is formed of the comminuted ore and an alkaline solution of an alkali or alkaline earth metal cyanide, the precious metals and any copper present are precipitated by the addition of a metallic precipitant, e.g. zinc, and the values are then recovered by a flotation concentration. To prevent re-solution of the precious metals during the flotation when the pulp absorbs oxygen, the pulp is stabilized by inhibiting or destroying the cyanogen solvents in the pulp by the addition of a metallic salt such as copper sulphate, copper chloride, mercurous chloride, or other mercury salt. The pulp is preferably conditioned prior to the addition of the metallic precipitant to deoxidize it, and to afford a solvent for the metallic precipitant. The deoxidation &c. may be effected by adding a bisulphite of an alkali or alkaline earth metal, e.g. sodium or calcium bisulphite, or ferrous sulphate. The pulp may be neutralized by adding an acid such as sulphuric acid prior to the addition of the deoxidizing agent. Alternatively the pulp may be conditioned by passing sulphur dioxide through the pulp. The precipitating agent, e.g. zinc dust, may be used as an emulsion in water and a soluble lead salt, e.g. the acetate or nitrate, may be added to the emulsion. In the case of a low-grade ore the whole of the pulp may be subjected to the successive steps of conditioning, precipitation, stabilizing, and flotation, but in the case of a high-grade ore the pulp may be thickened after the cyaniding step and the bulk of the liquid passed to an ordinary precipitation and filtering plant, from which the barren liquor is returned to the cyaniding step. Only the remaining pulp from the thickener is treated according to the invention. Alternatively the slime components of the ore may be separated by a washing operation from the coarser components, the slimes being thickened, treated with cyanide solution and then conditioned &c. by the process described, whereas the coarser components are ground, cyanided and treated in a thickener, the thickened pulp being agitated with additional cyanide solution and filtered, the filtrate being returned to the grinding step. The liquid from the thickener is clarified, deaerated, and treated to precipitate the values and filtered, the barren solution from the precipitating step being used for treating the slimes. The flotation concentrate includes precipitated values and also any precious metals or their minerals which did not dissolve in the cyanide; the values may be recovered from the concentrate by cyanidation. The deoxidation of the pulp in the conditioning step and the addition of the cyanicide are stated to improve the flotation, particularly of oxidized or tarnished sulphide ores. Specifications 442,315 and 451,979 are referred to. |
| priorityDate | 1935-06-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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