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Method for segregating metals and minerals from one another by leaching

a technology of metals and minerals, applied in the field of segregating metals and minerals from one another, can solve the problems of reducing the profitability of bioprocesses, low extraction degree, and toxicity of processes, and achieves the effect of reducing the cost of bioprocessing, reducing the degree of extraction of metals, and reducing the degree of extraction

Inactive Publication Date: 2002-03-28
FA BIOMEDY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of yielding only a low degree of extraction and of having a toxicity associated with the process.
A disadvantage of this method is its low degree of extraction of metals due to the presence in the ore of carbonaceous minerals comprised of rocks having predominantly a non-silicate composition.
This need to introduce sulfuric acid sharply reduces the profitability of the bioprocess.
Moreover, toxic cyanide dissolvent is used in the process.
The disadvantages of this method include its low degree of metal extraction and the relatively lengthy duration of the process due to the fact that some of the autochthonous microflora (microorganisms living in the minerals involved in the process) which develop because of the presence of the aqueous extract of vegetative residues do not participate in the metal extraction process and the number of those microorganisms which do participate in the metal extraction process is insufficient to sustain an industrial scale commercially viable metal extraction output.
Moreover, the development time of autochthonous microflora is lengthy and necessitates the creation of conditions favorable to such development.

Method used

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Examples

Experimental program
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Effect test

example 2

[0033] Quartz-tinstone-sulfide ores were leached by a vat leaching method.

[0034] The percent chemical composition comprised:

[0035] Ag--0.0078; Zn--2.0; Cd--0.1; Ti--1.0; Fe--10.37

[0036] As--0.8; Si--28.1; Mg--0.36; Ca--0.09; Na--0.03

[0037] K--2.4; Sn--0.3; In--0.05

[0038] The percent mineral composition comprised:

[0039] Pyrite--30%, pyrrhotine--2%, arsenopyrite--1%, tinstone--1%,

[0040] blende--4%, stannite--2%, sulphosalts of silver, tin, lead--2%, and rock forming minerals in the form of quartz, tourmaline, alephibol, chlorite, and muscovite.

[0041] The initial conditions for the leaching process were as follows:

[0042] A charge of 18 kg of ore having particles of 0.15 mm size was loaded through a hatch into a tub having a working capacity of 180 liters. Leaching agent comprised of a biomass of microorganisms having chemo-organotropic type of exchange was loaded into the tub in the amount of 162 liters. The solid to liquid ratio was 1:10. The process was carried out at T=23.degree. C....

example 3

[0050] Ore of a no longer used copper mine was subjected to underground leaching.

[0051] The percent chemical composition of the ore was:

[0052] SiO.sub.2--22.62%, Al.sub.2O.sub.3--0.43%, Fe--34.4%, Ca--0.1%, Cu--3%, Zn--1%, K--0.2%, Na--0.2%

[0053] The percent mineral composition of the ore was:

[0054] Pyrite--60%, minerals of copper: chalcopyrite--8-10%, covellite, cubanite, cuprite, bornite, malachite, native copper--approximately 1%, quartz--24%

[0055] The upper zone of the deposit was comprised of oxidized ores; the middle zone of the deposit was comprised of ores of secondary enrichment; and the lower zone of the deposit was comprised of sulfides containing chalcopyrite and pyrite.

[0056] An explosion crushed 400,000 tons of ore and 200,000 tons of rocks. The explosion exposed split ore along the face with terraces having a height of 6.1 m and a width of between 4.6 m to 55 m. The average size of the pieces was 230 mm.

[0057] A biomass of microorganisms having chemo-organotropic type...

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Abstract

A method for extracting metals from minerals is provided that involves the leaching of metals with a leaching agent comprised of a biomass of microorganisms having a chemo-organotrophic type of exchange which are grown in a nutrient medium. The microorganisms having chemo-organotropic type of exchange are selected from natural materials and may include acetic bacteria, pseudomonades, and sulfuric bacteria. The leaching is carried out with the consumption of biomass not less than 3x10-3 kg per 1 kg of mineral raw material. A water solution of higher carbohydrate polymers is used as a nutrient medium and a mineral additive may be added thereto. Phosphate of ammonia, ammonium chloride, a mixture of phosphate of ammonia and ammonium chloride, or sodium chloride is used as the mineral additive. Vegetative residues, sawdust, cane, sedge, and household wastes are used as the higher carbohydrate polymers.

Description

BACKGROUND OF THE PRESENT INVENTION[0001] The present invention relates to a method for segregating metals and minerals from one another and, in particular, to a method for segregating metals such as silver and gold from minerals in connection with mining and other industries.[0002] One conventional method for extracting metals from minerals is described in Design And Operation Of A Commercial Bacterial Oxidation Plant At Fairview / Tub Asweden P.C., Marais H. Y., Haines A. K. Marshalltown, 1988 (12 pages) and involves leaching by autotrophic acidophilic microorganisms Thiobacillus ferrooxidans with subsequent cyanidation of the leaching products. However, this method has the disadvantages of yielding only a low degree of extraction and of having a toxicity associated with the process.[0003] Another conventional method for extractions of metals from minerals is described in Mining Journal, 1990, Vol. 314, No. 8068, pages 335-337 and involves leaching by the microorganisms Thiobacillus...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B11/00
CPCC22B3/18C22B11/04Y02P10/20
Inventor GALINA, CHOUGINA
Owner FA BIOMEDY
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