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Применить Всего найдено 9. Отображено 9.
15-08-2017 дата публикации

Chloride process for the leaching of gold

Номер: US0009732398B2
Автор: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, M. A. Halim, LAKSHMANAN VAIKUNTAM I, SRIDHAR RAMAMRITHAM, HALIM M A, Lakshmanan Vaikuntam I., Sridhar Ramamritham, Halim M. A.
Принадлежит: Process Research Ortech Inc., PROCESS RES ORTECH INC

A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent extraction step using an oxime to obtain a solution of organic solvent containing gold, which is stripped with sodium thiosulphate to recover gold. The extraction may be operated to extract gold with or without iron. Materials used in the process may be recycled. The process avoids environmental and other hazards associated with the use of cyanide to extract gold.

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Номер записи: 1
13-06-2013 дата публикации

SEPARATION OF IRON FROM VALUE METALS IN LEACHING OF LATERITE ORES

Номер: US20130149219A1
Автор: Chen Jonathan, DeLaat Robert, Halim M. A., Lakshmanan Vaikuntam I., Sridhar Ramamritham
Принадлежит:

The invention provides a process for the leaching of a laterite ore, concentrate, tailings or waste rock for the recovery of value metals, at least one value metal being nickel. The laterite ore or concentrate is subjected to a leaching step with a lixiviant comprising hydrochloric acid to leach nickel from the laterite ore, followed by a liquid/solids separation step. The liquid obtained is subject to solvent extraction with a dialkyl ketone, to obtain a solution rich in iron and a raffinate. Separation of iron from cobalt and nickel is obtained. 1. A process for the leaching of a laterite ore or concentrate for the recovery of value metals , such values including iron , cobalt and nickel , comprising the steps of:a) subjecting laterite ore or concentrate to a leaching step with a lixiviant comprising hydrochloric acid to leach value metals from the laterite ore or concentrate, followed by a liquid/solids separation step to obtain a solution containing value metals; andb) subjecting the solution obtained in step (a) to solvent extraction with a dialkyl ketone, to obtain a solution rich in iron and a raffinate.2. The process of in which the lixiviant is a mixed chloride lixiviant.3. The process of in which the solution rich in iron from step b) is subjected to pyrohydrolysis or a hydrothermal process followed by a liquid/solids separation step to obtain a solids containing iron and a solution containing hydrochloric acid.4. The process of in which the lixiviant of step (a) is a solution of hydrochloric acid and magnesium chloride.5. The process of in which the dialkyl ketone has alkyl groups selected from the group consisting of C-Calkyl groups.6. The process of in which the alkyl groups are selected from the group consisting of methyl claim 5 , ethyl claim 5 , propyl claim 5 , isopropyl and isobutyl.7. The process of in which the dialkyl ketone is methylisobutyl ketone or dibutyl ketone.8. The process of in which the raffinate of step (b) is subjected to steps to ...

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Номер записи: 2
31-10-2013 дата публикации

CHLORIDE PROCESS FOR THE LEACHING OF GOLD

Номер: US20130283976A1
Автор: Halim M. A., Lakshmanan Vaikuntam I., Sridhar Ramamritham
Принадлежит:

A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent extraction step using an oxime to obtain a solution of organic solvent containing gold, which is stripped with sodium thiosulphate to recover gold. The extraction may be operated to extract gold with or without iron. Materials used in the process may be recycled. The process avoids environmental and other hazards associated with the use of cyanide to extract gold. 1. A process for the extraction of gold from a gold-bearing ore or concentrate , comprising the steps of:a) leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV; andb) subjecting the leach solution so obtained to a liquid/solids separation step.2. The process of in which liquid from step b) is subjected to steps for recovery of gold.3. The process of in which the liquid is subjected to organic solvent extraction followed by steps to recover gold from the resultant pregnant gold-bearing organic solvent extractant solution.4. The process of in which the temperature is in the range of 90-100° C. and the Eh is in the range of 1050-1150 mV.5. A process for the extraction of gold from a gold-bearing ore or concentrate claim 1 , comprising the steps of:a) leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV;b) subjecting the solution obtained in step a) to a liquid/solids separation step;c) subjecting the liquid obtained in step b) to an organic ...

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Номер записи: 3
31-10-2013 дата публикации

PROCESS FOR EXTRACTION OF RARE EARTH ELEMENTS

Номер: US20130283977A1
Автор: Halim M. A., Lakshmanan Vaikuntam I., Sridhar Ramamritham
Принадлежит:

A process for the extraction of rare earth elements, including yttrium, from a rare earth element-bearing ore or concentrate, comprising the steps of leaching the rare earth element-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of from 90° C. to the boiling point of the solution and at an Eh of at least 200 mV. After a liquid/solids separation step, the solution obtained is subjected to steps for removal of iron and for recovery of rare earth elements. Alternatively, rare earth element-bearing ore or concentrate may be leached with sulphuric acid and liquid obtained subjected to extraction of iron and other impurities. Raffinate obtained may be treated with oxalic acid, the precipitate dissolved in hydrochloric acid and subjected to solvent extraction for rare earth elements or the raffinate may be subjected to solvent extraction for removal of rare earth elements and then stripped with hydrochloric acid. 1. A process for the extraction of at least one rare earth element from a rare earth element-bearing ore or concentrate , comprising the steps of:a) leaching the rare earth element-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of from 90° C. to the boiling point of the solution and an Eh of at least 200 mV; andb) subjecting the leach solution so obtained to a liquid/solids separation step.2. The process of in which liquid from step b) is subjected to steps for recovery of at least one rare earth element or yttrium.3. The process of in which the Eh is at least 400 mV.4. The process of in which the rare earth element is selected from at least one rare earth element of atomic number 57-71.5. The process of in which yttrium is recovered.6. A process for the extraction of at least one rare earth element from a rare earth element-bearing ore or concentrate claim 1 , comprising the steps of:a) leaching the ...

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Номер записи: 4
23-06-2020 дата публикации

Process for extraction of rare earth elements

Номер: CA2869251C
Автор: M.A. Halim, Ramamritham Sridhar, Vaikuntam I. Lakshmanan
Принадлежит: Process Research Ortech Inc

A process for the extraction of rare earth elements, including yttrium, from a rare earth element-bearing ore or concentrate, comprising the steps of leaching the rare earth element-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of from 90°C to the boiling point of the solution and at an Eh of at least 200 mV. After a liquid/solids separation step, the solution obtained is subjected to steps for removal of iron and for recovery of rare earth elements. Alternatively, rare earth element-bearing ore or concentrate may be leached with sulphuric acid and liquid obtained subjected to extraction of iron and other impurities. Raffinate obtained may be treated with oxalic acid, the precipitate dissolved in hydrochloric acid and subjected to solvent extraction for rare earth elements or the raffinate may be subjected to solvent extraction for removal of rare earth elements and then stripped with hydrochloric acid.

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Номер записи: 5
20-06-2013 дата публикации

Separation of iron from value metals in leaching of laterite ores

Номер: WO2013086606A1
Автор: Jonathan Chen, M.A. Halim, Ramamritham Sridhar, Robert DELAAT, Vaikuntam I. Lakshmanan
Принадлежит: PROCESS RESEARCH ORTECH INC.

The invention provides a process for the leaching of a laterite ore, concentrate, tailings or waste rock for the recovery of value metals, at least one value metal being nickel. The laterite ore or concentrate is subjected to a leaching step with a lixiviant comprising hydrochloric acid to leach nickel from the laterite ore, followed by a liquid/solids separation step. The liquid obtained is subject to solvent extraction with a dialkyl ketone, to obtain a solution rich in iron and a raffinate. Separation of iron from cobalt and nickel is obtained.

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Номер записи: 6
17-10-2013 дата публикации

Chloride process for the leaching of gold

Номер: WO2013152424A1
Автор: M. A. Halim, Ramamritham Sridhar, Vaikuntam I. Lakshmanan
Принадлежит: PROCESS RESEARCH ORTECH INC.

A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90°C and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent extraction step using an oxime to obtain a solution of organic solvent containing gold, which is stripped with sodium thiosulphate to recover gold. The extraction may be operated to extract gold with or without iron. Materials used in the process may be recycled. The process avoids environmental and other hazards associated with the use of cyanide to extract gold.

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Номер записи: 7
17-10-2013 дата публикации

Process for extraction of rare earth elements

Номер: CA2869251A1
Автор: M.A. Halim, Ramamritham Sridhar, Vaikuntam I. Lakshmanan
Принадлежит: Process Research Ortech Inc

A process for the extraction of rare earth elements, including yttrium, from a rare earth element-bearing ore or concentrate, comprising the steps of leaching the rare earth element-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of from 90°C to the boiling point of the solution and at an Eh of at least 200 mV. After a liquid/solids separation step, the solution obtained is subjected to steps for removal of iron and for recovery of rare earth elements. Alternatively, rare earth element-bearing ore or concentrate may be leached with sulphuric acid and liquid obtained subjected to extraction of iron and other impurities. Raffinate obtained may be treated with oxalic acid, the precipitate dissolved in hydrochloric acid and subjected to solvent extraction for rare earth elements or the raffinate may be subjected to solvent extraction for removal of rare earth elements and then stripped with hydrochloric acid.

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Номер записи: 8
20-06-2013 дата публикации

Separation of iron from value metals in leaching of laterite ores

Номер: CA2859035A1
Автор: Jonathan Chen, M.A. Halim, Ramamritham Sridhar, Robert DELAAT, Vaikuntam I. Lakshmanan
Принадлежит: Process Research Ortech Inc

The invention provides a process for the leaching of a laterite ore, concentrate, tailings or waste rock for the recovery of value metals, at least one value metal being nickel. The laterite ore or concentrate is subjected to a leaching step with a lixiviant comprising hydrochloric acid to leach nickel from the laterite ore, followed by a liquid/solids separation step. The liquid obtained is subject to solvent extraction with a dialkyl ketone, to obtain a solution rich in iron and a raffinate. Separation of iron from cobalt and nickel is obtained.

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Номер записи: 9