РАЗРАБОТКА ТЕХНОЛОГИИ ДЛЯ ИЗВЛЕЧЕНИЯ МПГ ИЗ ШЛАКОВ АФФИНАЖНЫХ ПРОИЗВОДСТВ

РАЗРАБОТКА ТЕХНОЛОГИИ ДЛЯ ИЗВЛЕЧЕНИЯ МПГ ИЗ ШЛАКОВ АФФИНАЖНЫХ ПРОИЗВОДСТВ

Патент 1: Treatment process for extraction of metals from ores

Ссылки на патент:
1. https://patents.google.com/patent/AU2013263848A1/en?oq=AU2013263848A1+Treatment+process+for+extraction+of+metals+from+ores
2. https://register.epo.org/ipfwretrieve?apn=AU.2013263848.A&lng=en

Заявители: LIFEZONE LTD
Изобретатели: АДАМС МАЙКЛ ДЭВИД; СМИТ ЛИЗА ЭНН; ЛИДДЕЛЛ КИТ СТЮАРТ
Заявка AU2013263848A от 2013-11-29
Заявка подана компанией Lifezone Ltd от 2013-11-29
Приоритет по AU2013263848A от 2015-06-18
Публикация AU2013263848A1 от 2016-02-18
Заявка удовлетворена: 2016-02-18
Публикация AU2013263848B2
Статус: Активный
Предполагаемый срок действия: 2033-11-29

Классификации:
МПК
C22B11/06; C22B3/08
CPC
Y02P10/20 (EP)
Приоритеты: AU2013263848A·2013-11-29
Приложение: AU2013263848A·2013-11-29
Публикация: AU2013263848A1·2015-06-18
Опубликовано как: AU2013263848A1; AU2013263848B2

Текст патента:
1. A hydrometallurgical process for extracting one or more saleable elements from a sulphur-depleted or otherwise poorly-flotable ore, the process comprising: (ii) providing to a reaction vessel a sulphur-depleted or otherwise poorly-flotable ore; and a) subjecting the ore to a hot sulphuric acid leaching step under pressure or atmospheric conditions to produce a product slurry comprising saleable metal sulphates in solution and a solid residue containing saleable metals; and/or b) subjecting the ore of (i) or solid residue from a) to a chloride leaching step in a chloride leaching medium to produce soluble saleable metals in the chloride leaching medium.
2. The hydrometallurgical process of claim 1, further comprising a step of separating the solid residue containing saleable metals from the saleable metal sulphates in solution from the product slurry of step a) and then providing the resultant separated solid residue to step b).
3. The hydrometallurgical process of claim 2, wherein the separation is performed by any solid/liquid separation means.
4. The hydrometallurgical process of claim 3, wherein the means of solid/liquid separation is filtration.
5. The hydrometallurgical process of any one of claims 1 to 4, wherein the process further comprises a step of recovery of saleable metals from the metal sulphates in solution and/or from the chloride leaching medium.
6. The hydrometallurgical process of claim 5, wherein the recovery is by means of any one or more of the techniques including solvent extraction, - 23 - ion exchange, precipitation using hydroxides, carbonates or sulphides, electrowinning, or reduction.
7. The hydrometallurgical process of any one of claims 1 to 6, wherein the ore of step (i) or the solid residue from step a) is subjected to a thermal treatment to produce a thermally treated calcine before subjecting it to step b).
8. The hydrometallurgical process of claim 7, wherein the thermal treatment is performed at 80 - 750 2C for up to 120 minutes, under oxidizing, neutral or reducing conditions, to remove volatile components from the solid residue.
9. The hydrometallurgical process of either claim 7 or 8, wherein the thermal treatment is performed at 400 - 650 2C for 10 to 30 minutes, under oxidizing, neutral or reducing conditions, to remove volatile components from the solid residue.
10. The hydrometallurgical process of any one of claims 7 to 9, wherein an additional thermal treatment is performed at 500 - 1000 2C for up to 120 minutes, under oxidizing, neutral or reducing conditions, to condition the saleable metals to be soluble in chloride leaching medium.
11. The hydrometallurgical process of claim 10, wherein the additional thermal treatment is performed at 700 - 1000 2C for 30 to 120 minutes, under oxidizing, neutral or reducing conditions, to condition the saleable metals to be soluble in chloride leaching medium.
12. The hydrometallurgical process of either claims 10 or 11 wherein the thermal treatments are performed as individual steps of a sequential thermal treatment process, or as one combined step.
13. The hydrometallurgical process of any one of claims 1 to 12, wherein the product slurry of step a) is subjected to a hot acidic conditioning step or an atmospheric leach step to effect the removal of iron sulphates to the solution phase, and then subjected to step b). - 24 -
14. The hydrometallurgical process of any one of claims 1 to 13, wherein the sulphur-depleted or otherwise poorly-flotable ore of (i) is initially processed by crushing, milling or is as-mined.
15. The hydrometallurgical process of claim 14, wherein the ore is subjected to a benefication step performed by methods including screening, sizing, classification, magnetic separation, electrostatic separation, dense media sepration, radiometric sorting, optical sorting, or gravity separation thereby to concentrate the valuable metals or reject a gangue component.
16. The hydrometallurgical process of any one of claims 1 to 15, wherein the sulphur-depleted or otherwise poorly-flotable ore includes a poorly-flotable polymetallic ore, a weathered ore, including a laterite or goethite or other oxidised ore containing the saleable element, or a PGM ore that is not weathered but the nature of the PGMs in the ore are such that low recovery yields are obtained or concentrate grades are too low to meet smelter requirements when subjected to flotation.
17. The hydrometallurgical process of claim 16, wherein the weathered ore is a PGM-bearing ore that lies close to the surface and gives low PGM recovery when concentrated by flotation.
18. The hydrometallurgical process of any one of claims 1 to 17, wherein the saleable element(s) comprise at least one or more platinum group metals (PGMs), gold (Au), silver (Ag), nickel (Ni), cobalt (Co), copper (Cu), rare earth metals (RRE), yttrium (Y), scandium (Sc), uraniun (U), thorium (Th), zinc (Zn), manganese (Mn), cadmium (Cd), molybdenum, (Mo), vanadium (V), titanium (Ti), sulphur (S), sulphuric acid (H 2 SO 4 ) and/or iron (Fe) containing products.
19. The hydrometallurgical process of claim 18, wherein the saleable element(s) are platinum group metals (PGMs), gold (Au), silver (Ag), nickel (Ni), cobalt (Co), copper (Cu), rare earth elements (REE), yttrium (Y), scandium (Sc), uranium (U), thorium (Th), zinc (Zn), manganese (Mn), cadmium (Cd), molybdenum, (Mo), vanadium (V), titanium (Ti). - 25 -
20. The hydrometallurgical process of either claim 18 or 19, wherein the saleable element(s) are platinum group metals (PGMs).
21. The hydrometallurgical process of any one of claims 1 to 20, wherein the solid residue of step a) is subjected, either directly or after a milling process, to a process to either concentrate the valuable metals or reject gangue components.
22. The hydrometallurgical process of claim 21, wherein the concentration or gangue rejection process is conventional screening, hydrocyclone or other classification means based on size, magnetic separation under either or both high and low-intensity magnetic fields, gravity separation, dense media sepration, radiometric sorting, optical sorting, or electrostatic separation.