Solid-liquid-solid hydrometallurgical process optimized to increase the solubilization of metals from ores and/or concentrates in acid-chloride medium
The present invention describes a Solid-Liquid-Solid hydrometallurgical process, optimized and independent of redox potential, to increase the solubilization of metals from ores and/or concentrates with a granulometry of less than 40 mm, by means of an initial stage called “Activation”; a second stage called “Dry autocatalytic transformation”; a third stage called “Washing and re-wetting”; and where the stages of dry autocatalytic transformation and washing and re-wetting, can be repeated in an alternating and repeated way.
1. A Solid-Liquid-Solid hydrometallurgical procedure, optimized and independent of redox potential, to increase the solubilization of metals from ores and/or concentrates, wherein this procedure comprises the following stages:
a) an initial stage called “Activation”, comprising a curing and agglomeration process, which is carried out by:
a.1) the addition of sodium chloride at a rate of between 10 kg/t and 60 kg/t, sulfuric acid at a rate of between 10 kg/t and 30 kg/t, and water or an acid-chloride solution at a rate of between 60 kg/t and 100 kg/t, at room temperature, and achieving a final moisture of between 6% and 12%, for primary and/or secondary copper sulfide ores; or
a.2) the addition of sodium chloride at a rate of between 100 kg/t and 250 kg/t, sulfuric acid at a rate of between 10 kg/t and 30 kg/t, and water or an acid-chloride solution at a rate of between 60 kg/t and 120 kg/t, at room temperature, and reaching a final moisture of between 8% and 15%, for copper concentrates;
b) a second stage called “Autocatalytic Dry Transformation”, which comprises a process of drying and over-saturation of chloride salts, for a time of between 30 and 90 days in each cycle, at a temperature of between 40° C. and 60° C.;
c) a third stage called “Washing and re-Wetting”, which involves irrigation with an acid-chloride solution or industrial raffinate, using an irrigation rate of at least 5 L/h/m 2 , and a pH of between 0.1 and 5;
where the stages b) of auto-catalytic dry transformation and c) of washing and re-wetting, are repeated in an alternate and repeated way, for 3 to 8 cycles.
2. The procedure in accordance with claim 1 , wherein the procedure is carried out with minerals at a granulometry of less than 40 mm.
3. The procedure according to claim 1 , wherein the procedure is done with minerals with a granulometry lower than 25 mm.
4. The procedure according to claim 1 , wherein the acid-chloride solution from step a.1), a.2), and/or c) is prepared with water and/or industrial raffinate solutions, both with chloride ion contents.
5. The procedure according to claim 4 , wherein the acid-chloride solution from step a.1), a.2), and/or c) comprises seawater.
6. The procedure according to claim 5 , wherein in step a.1), the acid-chloride solution comprises seawater at a rate of 80 kg/t.
7. The procedure according to claim 1 , wherein in stage a.1), the sulfuric acid is added at a rate of 20 kg/t.
8. The procedure according to claim 1 , wherein in stage a.1), an addition of chloride ion is through sodium chloride salts added at a rate of 30 kg/t.
9. The procedure according to claim 1 , wherein in stage a.1), a final moisture of 10% is reached.
10. The procedure according to claim 1 , wherein stage b), comprises the injection of cold or hot wet air, from a mixture of air and water steam, through the lower layers of the industrial leaching heap, to enhance and accelerate drying during the drying cycles.
11. The procedure according to claim 1 , wherein in stage b), the drying is carried out for a time of 45 days per cycle.
12. The procedure according to claim 1 , wherein in stage b), the drying is carried out at a temperature of 50° C.
13. The procedure according to claim 1 , wherein in stage c), for copper concentrates is carried out in a stirred reactor with a solid/liquid ratio of between 1:5 and 1:10, and concluding with a filtration that allows a final moisture of no more than 15% to be reached.
14. The procedure according to claim 1 , wherein in stage c), the acid-choride solution or industrial raffinate is at a concentration of between 80 and 200 g/l of chloride ion.
15. The procedure according to claim 14 , wherein in stage c), the acid-choride solution or industrial raffinate is at a temperature above 25° C.
16. The procedure according to claim 1 , wherein the metals to be solubilized during step b) are selected from the group that includes copper, zinc, nickel, molybdenum, cobalt, and lead.
17. The procedure according to claim 1 , wherein the solubilization of metals to be solubilized during step b) is carried out from sulfide ores with arsenical contents and/or arsenical sulfide ore concentrates containing the metals to be solubilized.
18. The procedure according to claim 1 , wherein the solubilization of the metals to be solubilized in step b) is carried out from minerals and/or copper concentrates, which contain chalcopyrite, enargite, bornite, covellite, chalcocite, and tennantite.