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AssigneeSociete Miniere et Metallurgique de Penarroya
InventorsJean-Michel Demarthe, Andre Georgeaux
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The invention provides a hydrometallurgical process for recovering lead in essentially pure form from a sulphurized compound containing at least lead as a non-ferrous metal. The process involves treating the sulphurized compound with an aqueous lixiviating solution containing at least one chloride of a metal selected from the group consisting of copper, bismuth, antimony, arsenic, and silver, preferably cupric chloride, the quantity of said at least one chloride being less than or equal to that which is stoichiometrically required for the complete dissolution of the lead contained in the sulphurized compound, thereby to obtain a solution containing lead chloride and the chlorides of metals nobler than lead as impurities if originally present in the sulphurized lead compound, and an insoluble residue containing the sulphide of the metal of said at least one chloride, the sulphides of the non-ferrous metals originally present in the sulphurized compound, and free sulphur. The lead chloride solution is separated from the insouble residue, and purified by cementation with metallic lead or a more reducing metal than lead. Thereafter, the lead ions of the purified lead chloride solution are reduced to metallic lead which is recovered. The reduction may be accomplished by cementation with a more reducing metal than lead, preferably iron, or the reduction may be carried out by means of hydrogen.
A process for obtaining lead chloride from sulfide ores containing lead sulfide comprising:
A process for separating lead chloride from sulfide ores containing lead sulfide comprising:
A process of forming lead chloride from sulfide ores containing lead sulfide comprising:
A process for separating lead chloride formed from sulfide ores containing lead sulfide comprising:
A process of forming lead chloride from sulfide ores containing lead sulfide comprising:
A process of separating lead chloride formed from sulfide ores containing lead sulfide comprising:
A process for obtaining lead chloride from sulphide ores containing lead sulfide comprising:
A process for separating lead chloride from sulphide ores containing lead sulphide comprising:
A hydrometallurgical process for recovering lead from a sulphurized compound containing at least lead as a non-ferrous metal, comprising contacting said sulphurized compound with an aqueous lixiviating solution containing at least one chloride of a metal selected from the group consisting of copper, bismuth, antimony, arsenic, and silver to form a solution containing lead chloride and to form a precipitate containing the sulphide of the metal of said at least one chloride, the quantity of said at least one chloride in said aqueous lixiviating solution being less than or about equal to the stoichiometric quantity required to completely dissolve the lead contained in the sulphurized compound as said lead chloride and to form said precipitate, said aqueous lixiviating solution containing at least 4 gram-equivalents of chloride ions per liter, said chloride ions being introduced into the said aqueous lixiviating solution by addition of at least one chloride selected from the group consisting of ammonium chloride, an alkali metal chloride, and an alkaline earth metal chloride.
A hydrometallurgical process for recovering lead from a sulphurized compound containing at least lead as a non-ferrous metal, comprising contacting said sulphurized compound with an aqueous lixiviating solution containing at least one chloride of a metal selected from the group consisting of copper, bismuth, antimony, arsenic, and silver to form a solution containing lead chloride and to form a precipitate containing the sulphide of the metal of said at least one chloride, the quantity of said at least one chloride in said aqueous lixiviating solution being less than or about equal to the stoichiometric quantity required to completely dissolve the lead contained in the sulphurized compound as said lead chloride and to form said precipitate, the quantity of lead to be lixiviated per unit of volume being greater than the dissolving capacity of the aqueous lixiviating solution such that a portion of the formed lead chloride remains undissolved, the copper concentration of the aqueous solution being at least equal to 30 g/1.
A hydrometallurgical process for recovering lead from a sulphurized compound containing at least lead as a non-ferrous metal, comprising contacting said sulphurized compound with an aqueous lixiviating solution containing at least one chloride of a metal selected from the group consisting of copper, bismuth, antimony, arsenic, and silver to form a solution containing lead chloride and to form a precipitate containing the sulphide of the metal of said at least one chloride, the quantity of said at least one chloride in said aqueous lixiviating solution being less than or about equal to the stoichiometric quantity required to completely dissolve the lead contained in the sulphurized compound as said lead chloride and to form said precipitate, the quantity of lead to be lixiviated per unit of volume being greater than the dissolving capacity of the aqueous lixiviating solution such that a portion of the formed lead chloride remains undissolved, and exposing the solid mixture of lead chloride and of sulphides, obtained after filtration of the reaction mixture, to a physical separation technique to separate the lead chloride from the sulphides.
A hydrometallurgical process for recovering lead from a sulphurized compound containing at least lead as a non-ferrous meta, comprising contacting said sulphurized compound with an aqueous lixiviating solution containing at least one chloride of a metal selected from the group consisting of copper, bismuth, antimony, arsenic, and silver to form a solution containing lead chloride and to form a precipitate containing the sulphide of the metal of said at least one chloride, the quantity of said at least one chloride in said aqueous lixiviating solution being less than or about equal to the stoichiometric quantity required to completely dissolve the lead contained in the sulphurized compound of said lead chloride and to form said precipitate, and quantity of lead to be lixiviated per unit of volume much greater than the dissolving capacity of the aqueous lixiviating solution such that a portion of the formed lead chloride remains undissolved, and exposing the undissolved lead chloride to a cementation by means of a metal selected from the group consisting of iron and zinc.
A hydrometallurgical process for recovering lead from a sulphurized compound containing at least lead as a non-ferrous metal, comprising contacting said sulphurized compound with an aqueous lixiviating solution containing at least one chloride of a metal selected from the group consisting of copper, bismuth, antimony, arsenic, and silver to form a solution containing lead chloride and to form a precipitate containing the sulphide of the metal of said at least one chloride, the quantity of said at least one chloride in said aqueous lixiviating solution being less than or about equal to the stoichiometric quantity required to completely dissolve the lead contained in the sulphurized compound as said lead chloride and to form said precipitate, the quantity of lead to be lixiviated per unit of volume being greater than the dissolving capacity of the aqueous lixiviating solution such that a portion of the formed lead chloride remains undissolved, and wherein the mixture of lead chloride and sulphides, obtained after filtration of the reaction mixture, is returned into the state of pulp and cemented by means of a metal selected from the group consisting of iron and zinc.
A hydrometallurgical process for recovering lead from a sulphurized compound containing at least lead as a non-ferrous metal, comprising contacting said sulphurized compound with an aqueous lixiviating solution containing at least one chloride of a metal selected from the group consisting of copper, bismuth, antimony, arsenic, and silver to form a solution containing lead chloride and to form a precipitate containing the sulphide of the metal of said at least one chloride, the quantity of said at least one chloride in said aqueous lixiviating solution being less than or about equal to the stoichiometric quantity required to completely dissolve the lead contained in the sulphurized compound as said lead chloride and to form said precipitate, the quantity of lead to be lixiviated per unit of volume being greater than the dissolving capacity of the aqueous lixiviating solution such that a portion of the formed lead chloride remains undissolved, and the solid mixture, obtained after filtration of the reaction mixture, is redissolved in a solution of dissociated metal chloride to yield a solution of lead chloride and a solid phase composed of sulphides.
A hydrometallurgical process for recovering lead in essentially pure form from a sulphurized compound containing at least lead as a non-ferrous metal, comprising:
Dependencies are inferred from the claim text.