A method for recovering alkali and aluminum during treatment of Bayer red mud using a calcification-carbonation method, including steps of mixing the Bayer red mud with calcium aluminate or with calcium aluminate and lime, performing calcification dealkalization conversion in a high-concentration alkaline liquor, and carbonizing the calcified residues produced during dealkalization to obtain carbonized residues; and then performing low-temperature aluminum dissolution, aluminum precipitation and the like to obtain calcium aluminate products, which is returned to the calcification dealkalization conversion of the red mud for recycling. Part of an alkali-containing and aluminum-containing liquid phase after calcification dealkalization conversion can be used as supplementary alkali in the Bayer production course for recycling. The method is energy-saving and environmentally-friendly, and allows recovering alkali and aluminum from the red mud and harmless treatment of the Bayer red mud.

A method for recovering alkali and aluminum during treatment of Bayer red mud using a calcification-carbonation method, including steps of mixing the Bayer red mud with calcium aluminate or with calcium aluminate and lime, performing calcification dealkalization conversion in a high-concentration alkaline liquor, and carbonizing the calcified residues produced during dealkalization to obtain carbonized residues; and then performing low-temperature aluminum dissolution, aluminum precipitation and the like to obtain calcium aluminate products, which is returned to the calcification dealkalization conversion of the red mud for recycling. Part of an alkali-containing and aluminum-containing liquid phase after calcification dealkalization conversion can be used as supplementary alkali in the Bayer production course for recycling. The method is energy-saving and environmentally-friendly, and allows recovering alkali and aluminum from the red mud and harmless treatment of the Bayer red mud.

Disclosed is a combined treatment method for laterite nickel ore hydrometallurgical slag and phosphating slag, the combined treatment method includes uniformly mixing a laterite nickel ore hydrometallurgical slag, a phosphating slag, and a sodium alkaline salt to obtain a mixed material; subjecting the mixed material to sodium reduction roasting to obtain a roasted material; leaching the roasted material with water and filtering to obtain a water leaching solution and a water leaching slag; subjecting the water leaching slag to magnetic separation to obtain an iron concentrate. In the disclosure, by mixing a laterite nickel ore hydrometallurgical slag and a phosphating slag and then performing sodium reduction roasting, the iron exists in the form of Fe.sub.3O.sub.4 and elements such as manganese and zinc exist in the slag in the form of oxides, and during the roasting process, aluminum oxides react with alkali to be converted into sodium aluminate.

Disclosed is a combined treatment method for laterite nickel ore hydrometallurgical slag and phosphating slag, the combined treatment method includes uniformly mixing a laterite nickel ore hydrometallurgical slag, a phosphating slag, and a sodium alkaline salt to obtain a mixed material; subjecting the mixed material to sodium reduction roasting to obtain a roasted material; leaching the roasted material with water and filtering to obtain a water leaching solution and a water leaching slag; subjecting the water leaching slag to magnetic separation to obtain an iron concentrate. In the disclosure, by mixing a laterite nickel ore hydrometallurgical slag and a phosphating slag and then performing sodium reduction roasting, the iron exists in the form of Fe.sub.3O.sub.4 and elements such as manganese and zinc exist in the slag in the form of oxides, and during the roasting process, aluminum oxides react with alkali to be converted into sodium aluminate.

A process for producing high purity alumina (HPA) or high purity aluminium salts from an aluminium-bearing material, such as is disclosed. An aluminium-bearing solution is first obtained by either dissolving or leaching the aluminium-bearing material. Aluminium is then selectively extracted by liquid-liquid or liquid-solid extraction to obtain an aluminium-enriched liquid or aluminium-enriched solid phase. Minor metal impurities still remaining in the aluminium-enriched liquid or solid phase are removed by scrubbing the aluminium-enriched liquid or aluminium-loaded ion exchange resin with an aqueous solution thereby producing a metal impurity-depleted aluminium-enriched liquid or metal impurity-depleted aluminium enriched solid phase. Aluminium is then stripped from the scrubbed liquid or solid phases with an acidic aqueous solution to produce an aluminium-enriched aqueous solution. High purity aluminium salts may be crystallised from said solution. Alternatively, the pH of said solution may be raised to precipitate an aluminium precipitate, such as Al(OH)3, which is then calcined to produce HPA.

A process for producing high purity alumina (HPA) or high purity aluminium salts from an aluminium-bearing material, such as is disclosed. An aluminium-bearing solution is first obtained by either dissolving or leaching the aluminium-bearing material. Aluminium is then selectively extracted by liquid-liquid or liquid-solid extraction to obtain an aluminium-enriched liquid or aluminium-enriched solid phase. Minor metal impurities still remaining in the aluminium-enriched liquid or solid phase are removed by scrubbing the aluminium-enriched liquid or aluminium-loaded ion exchange resin with an aqueous solution thereby producing a metal impurity-depleted aluminium-enriched liquid or metal impurity-depleted aluminium enriched solid phase. Aluminium is then stripped from the scrubbed liquid or solid phases with an acidic aqueous solution to produce an aluminium-enriched aqueous solution. High purity aluminium salts may be crystallised from said solution. Alternatively, the pH of said solution may be raised to precipitate an aluminium precipitate, such as Al(OH)3, which is then calcined to produce HPA.

Disclosed is a combined treatment method for laterite nickel ore hydrometallurgical slag and phosphating slag, the combined treatment method includes uniformly mixing a laterite nickel ore hydrometallurgical slag, a phosphating slag, and a sodium alkaline salt to obtain a mixed material; subjecting the mixed material to sodium reduction roasting to obtain a roasted material; leaching the roasted material with water and filtering to obtain a water leaching solution and a water leaching slag; subjecting the water leaching slag to magnetic separation to obtain an iron concentrate. In the disclosure, by mixing a laterite nickel ore hydrometallurgical slag and a phosphating slag and then performing sodium reduction roasting, the iron exists in the form of Fe.sub.3O.sub.4 and elements such as manganese and zinc exist in the slag in the form of oxides, and during the roasting process, aluminum oxides react with alkali to be converted into sodium aluminate.

Disclosed is a combined treatment method for laterite nickel ore hydrometallurgical slag and phosphating slag, the combined treatment method includes uniformly mixing a laterite nickel ore hydrometallurgical slag, a phosphating slag, and a sodium alkaline salt to obtain a mixed material; subjecting the mixed material to sodium reduction roasting to obtain a roasted material; leaching the roasted material with water and filtering to obtain a water leaching solution and a water leaching slag; subjecting the water leaching slag to magnetic separation to obtain an iron concentrate. In the disclosure, by mixing a laterite nickel ore hydrometallurgical slag and a phosphating slag and then performing sodium reduction roasting, the iron exists in the form of Fe.sub.3O.sub.4 and elements such as manganese and zinc exist in the slag in the form of oxides, and during the roasting process, aluminum oxides react with alkali to be converted into sodium aluminate.