Extraction method of precious and rare metals from solutions with low concentration at presence of ions of other metals and device for its implementation

FIELD: metallurgy.

SUBSTANCE: inventions relate to gold extraction from solutions with low concentration at presence of ions of other metals, for instance cleaning solutions of gold-extracting plants, brines of potassium manufacturing, geothermal water, water of brine lakes and salt water. Essence consists in that through powder of metal-restorative it is passed gold-containing solution with low concentration at presence of ions of other metals during 2-240 hours. In the capacity of metal-restorative it is used lead-plated zinc powder of grade +0.001 mm - 2 mm with lead content 1-90 wt %. or powders of metals, used at temperature of solution not less than 50C and selected from the group: Zn, Fe, Ni, Pb, Sn, Sb, of grade +0.1 mm - 5 mm. Additionally before cementation powders are placed in cartridge. Received after cementation gold-containing concentrate is separated by means of intensive mechanical agitation, it is treated by nitric or acetic acid. Gold sediment is separated by filtration, dried and molten with fluxing additives with receiving of crude metal.

EFFECT: increase of effectiveness and selectivity of gold extraction from solutions with low concentration.

3 cl, 1 dwg, 3 ex

 

The invention relates to hydrometallurgy of precious and rare metals, in particular to processes for the recovery of gold from solutions with low concentrations in the presence of ions of other metals, such as clarified solutions gold extraction plants, brine potash production, geothermal waters, the waters of the salt lakes and sea water.

Currently unknown cost-effective technology for the recovery of gold from solutions of low concentration. The gold content in sea water varies from 0.004 mg/t to 65 mg/I. there Was a higher content of gold in the continental saline hot springs. So, the gold content in the hot springs of Arkansas (USA) amounted to 260 mg/t ... the gold content in the water of the Great Salt lake on Otake - 360 mg/t, and in water from Mono lake in California - up to 540 mg/t (Ladeyshikov CENTURIES Technique and technology of gold extraction from ores abroad. M.: Nedra, 1974, str-267).

The method for extracting gold used on most gold companies that use cyanide process (metallurgy precious metals. M.: metallurgy, 1987, str). The method consists in the fact that clarified the gold-containing solution is subjected to deaeration, is mixed with zinc dust and acetic acid lead and filtered to highlight the gold-zinc osedc the simultaneous deposition of gold. Due to the large surface leaded zinc dust cementation process proceeds with high speed and completeness, while the bulk of the gold is deposited during the infiltration of the solution through a layer of cake on the surface of the filter. The disadvantage of this method is the low filtration rate of gold-bearing solutions through a thick layer of zinc dust, which greatly reduces the efficiency of the process in the recovery of gold from solutions of low concentration.

Known installation with vacuum frames to extract gold from the clarified cyanide solutions (metallurgy precious metals. M.: metallurgy, 1987, str). Under the action of the vacuum created by the vacuum pump, depleted gold solution seep into frames, and the gold sludge remains on the surface of the filter cloth in the form of a cake. The main amount of gold deposited in a period when the solution percolates through the layer of zinc dust, which is found on the surface of the filter frames. The drawbacks are the low speed filtering solution that enables cost-effective to extract precious metals from solutions of low concentration, as well as a large area occupied by the plants for gold precipitation with zinc dust.

A device for the extraction of gold from sea water, including the surrounding filtration column, filled with adsorbent and is connected to the intake Kingston (Wailace. Ocean of hope. M: Education, 1983, p.24). A disadvantage of the known devices is the high cost of the obtained metal.

The closest (prototype) is a method and apparatus for extracting gold from clarified cyanide solutions by the use of leaded zinc chip (Intracen, Udhav. Hydrometallurgy. M: Metallurgizdat, 1949, str-276, 369-376). Currently, the deposition of gold zinc shavings used on small scale and on a long-established enterprises. The disadvantages of the method and device are: high consumption of zinc, not full recovery of gold due to the fact that part of it is returned to the extractor with 25-30% of large zinc, large extractors, occupying large areas, the difficulty in making zinc shavings, low concentration of zinc shavings on unit solution that significantly reduces the recovery of gold from solution.

The objective of the invention is to improve the efficiency and selectivity of extraction of gold from solutions of low concentration, the rate of filtration of gold-bearing solutions.

The technical result of the invention is achieved in that in the method for extracting gold from gold-bearing solutions with low end is Tracia in the presence of ions of other metals by cementation him in restored form on leaded zinc powder gold-containing solution is passed through leaded zinc powder +0.001 mm - 2 mm with a lead content of 1-90 wt.% for 2-240 hours, after which the gold-lead concentrate is separated from the zinc powder and treated with nitric or acetic acid, the precipitate filtered, dried and melted flux additives known methods to obtain the crude metal.

The drawing shows a device for the recovery of precious and rare metals from solutions with low concentrations in the presence of ions of other metals, including filtration column 3 for the accumulation of gold-bearing solution with an opening for the feed solution 1, the handle of the filter column 5, the base 2 made in the form of a rigid metal grid with a cell of the order of 10 mm, sufficient to hold the pressure created by the solution in the filter column, a sealing gasket 4, located inside the filter column 3 cassette 9, filled with leaded zinc powder 8 held metal woven mesh 7 with cell size, ensures retention leaded zinc powder 8 in the cassette 9 and the transmission of the gold-bearing solution, and a metallic woven mesh 6 cell is not less than 0.4 mm for strength.

The method is implemented by the following device. Leaded zinc powder 8 class +0.001 mm to 2 mm with a lead content of 1-90 wt.% loaded into the cassette 9 and mounted on the base 2, stemware set the filter column 3, the function of which is to create pressure due to the weight of the gold-bearing solution to increase the rate of filtration through a layer of metal-comentator. Gold-bearing solution by gravity or by force, for example, by a pump, flows into the filter column 3 through the opening 1, located mainly in the upper part of the filter column, then the gold-containing solution passes through the cartridge 9 with leaded zinc powder 8, the surface of which is not less than 5 mm, and leaves the filter column 3 through the drain (the drawing shows arrows pointing downwards) in the drainage. After saturation of the cassette 9 gold-bearing concentrate within 2-240 hours, depending on the concentration of gold in solution, the indicated cartridge is removed from the filter column 3 and replace with a new cartridge. Leaded zinc powder 8 is unloaded from the cassette 9, gold-lead concentrate is separated from the zinc powder by intensive mechanical mixing of the known methods, the zinc powder used again, and gold-lead concentrate is treated with nitric or acetic acid by known methods, the precipitate is filtered, dried, and melted flux additives to obtain the crude metal by known methods.

With regard to geothermal waters, where the water temperature has reached the AET more than 50C, instead of leaded zinc powder can also be used metals-amendatory selected from Zn, Fe, Ni, Pb, Sn, Sb particle size of 0.1 mm - 5 mm, the Specific choice of these metals-cementation depends on the chemical composition of the geothermal water and the amount of impurity metals in geothermal waters in the first place As, cu, Pb, Se, Fe, Ni. Because of high water temperature accelerates the process of deposition of precious metals in dozens of times, so you can use the powders of these metals-cementation larger sizes.

The above-described preferred variant of the device according to the invention, although the invention is not limited only to them. It is obvious that various changes and modifications according to the invention within its scope defined by the claims.

The method and apparatus are illustrated in the following not limiting itself to the examples.

Example 1. In the cartridge with a capacity of 3 CC download leaded zinc powder +0.001 mm - 2 mm Cartridge is installed in the filter device and fix. A filter device connected to an aquarium pump. The device Assembly is lowered into the bath with 100 l of artificial brine 300 g/l sea salt with the content of AU in an amount of 0.1 mg/l Within 24 hours, the pump passes the specified brine through the filter device. After 24 cha is and determine the residual gold content in the brine and calculate the capacity of the zinc powder. When the initial Au concentration is 0.1 mg/l after 24 hours, the residual content of gold amounted to 0.03 mg/L. Capacity leaded zinc powder was 1.2 g Au per 1 kg of zinc powder.

Example 2. In the cartridge with a capacity of 3 CC download leaded zinc powder +0.001 mm - 2 mm Cartridge is installed in the filter device and fix. A filter device connected to an aquarium pump. The device Assembly is lowered into the bath with 200 l of artificial water and sea water containing Au - 0.025 mg/l Within 24 hours, the pump passes the specified solution through the filter device. After 24 hours, determine the residual content of gold in sea water and calculate the capacity of the zinc powder. When the original content of Au - 0.025 mg/l after 24 hours, the residual content of gold amounted to 0.01 mg/L. Capacity leaded zinc powder was 1.5 g Au per 1 kg of zinc powder.

Example 3. In the cartridge with a capacity of 6 CC download leaded zinc powder +0.001 mm - 2 mm Cartridge is installed in the filter device and fix. A filter device connected to an aquarium pump. The device Assembly is lowered into the bath with 200 l of artificial geothermal water solution temperature of 50-60C With Au concentration is 0.2 mg/l Within 24 hours, the pump passes the specified solution through the filter of the mouth of austo. After 24 hours, determine the residual content of gold in artificial geothermal water solution and calculate the capacity of the zinc powder. When the initial Au concentration is 0.2 mg/l after 24 hours, the residual gold content was 0.05 mg/L. Capacity leaded zinc powder was 2,48 g Au per 1 kg of zinc powder.

Example 4. In the cartridge with a capacity of 6 CC load powder metal antimony (Sb) class +0.1 mm - 5 mm Cassette is installed in the filter device and fix. A filter device connected to an aquarium pump. The device Assembly is lowered into the bath with 200 l of artificial geothermal water solution temperature of 50-60C With Au concentration is 0.2 mg/l After 24 hours to determine the residual content of gold in the water and calculate the capacity of a powder of metallic antimony. When the initial Au concentration is 0.2 mg/l after 24 hours, the residual content of gold amounted to 0.06 mg/L. the capacity of the powder of metallic antimony was 2,31 g Au per 1 kg of metallic antimony.

The proposed method can be used to extract gold from the clear solutions tailings gold recovery plants, brine potash production, geothermal waters, the waters of the salt lakes and sea water. The proposed method and apparatus for extracting gold from solutions with a concentration of less than 0.1 mg/l allows to achieve the high degree of extraction of gold - more than 90% restored in the form of solutions in the presence of salts of other metals and thus significantly increase the filtration rate of gold-bearing solutions.

1. The method of extracting gold from solutions with low concentrations in the presence of ions of other metals, including cementation of gold in restored form on the metal powder of the reducing agent with the release of gold-bearing sludge, characterized in that the metal powder-comentator use leaded zinc powder +0.001 mm to 2 mm with a lead content of 1-90 wt.% or metal powders used in the solution temperature at least 50C. and selected from the group of Zn, Fe, Ni, Pb, Sn, Sb, class +0.1 mm - 5 mm, while before cementation powders are placed in a cassette, cementation lead by passing through the cartridge gold-bearing solution for 2-240 h, separate gold-bearing sediment by intensive mechanical mixing, process it nitric or acetic acid, separated by filtration, dried and melted flux additives producing crude gold.

2. The method according to claim 1, characterized in that when used as a metal reductant leaded zinc powder after separation of the gold-bearing sludge containing lead, zinc powder used again.

3. Device to retrieve the treatment of gold from solutions with low concentrations in the presence of ions of other metals by cementation, including filtration column with an opening for the feed solution and the metal powder of the reducing agent, characterized in that it provided the basis for the establishment of a filtration column, made in the form of a rigid metal grid with a cell of the order of 10 mm, sufficient to hold the pressure created by the solution in the filter column, and the gasket, filter column made with handles and inside it is a replaceable cartridge filled with a powder of a metal reductant held metal woven mesh with cell size, ensuring the retention of the powder metal reductant in the cassette and the transmission of the gold-bearing solution, and a metallic woven mesh size cell is not less than 0.4 mm for strength.



 

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