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Found results for
 patents
1.
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HYDROMETALLURGICAL METHOD FOR RECOVERING ZINC IN A SULPHURIC MEDIUM FROM ZINC SULPHIDE CONCENTRATES HAVING A HIGH IRON CONTENT
| Application Number |
ES2012070535 |
| Publication Number |
2014/013092 |
| Status |
In Force |
| Filing Date |
2012-07-16 |
| Publication Date |
2014-01-23 |
| Owner |
TAM 5, S.L. (Spain)
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| Inventor |
Tamargo García, Franciso José
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Abstract
The invention is based on the recirculation of a solution containing no, or a low content of, iron, such that the final acidity conditions achieved are suitable for obtaining efficient precipitation of iron in the form of jarosite. In one embodiment, the zinc concentrate is subjected to the following steps: a. roasting of at least part of the zinc concentrate; b. neutral leaching, in which the zinc oxide is dissolved; c. acid leaching, in which the zinc ferrites are leached; d. reduction of the Fe+++ contained in the Fe++ solution by means of the addition of zinc concentrate and dilution with zinc sulphate solution originating from step (f) in order to reduce the concentration of Fe++; e. neutralisation of the acidity of the solution with calcine; f. oxidation of iron and precipitation of jarosite, free of solid contaminants, by means of the injection of oxygen or oxygen-enriched air and the addition of an alkali or a salt of Na+or NH4 +.
IPC Classes ?
- C22B 19/20 - Obtaining zinc otherwise than by distilling
- C22B 3/00 - Extraction of metal compounds from ores or concentrates by wet processes
- C22B 1/02 - Roasting processes
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2.
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HYDROMETALLURGICAL METHOD FOR THE RECOVERY OF ZINC IN SULPHURIC MEDIUM STARTING FROM SULPHUDIC ZINC CONCENTRATES
| Application Number |
ES2011070265 |
| Publication Number |
2012/140284 |
| Status |
In Force |
| Filing Date |
2011-04-15 |
| Publication Date |
2012-10-18 |
| Owner |
TAM 5, S.L. (Spain)
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| Inventor |
Tamargo Garcia, Francisco José
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Abstract
The invention relates to a method wherein the zinc concentrate is subjected to the following steps: a. roasting at least one part of the zinc concentrate; b. neutral leaching, wherein the zinc oxide is dissolved; c. acid leaching, wherein the zinc ferrites are leached; d. reducing the Fe+++ contained in the Fe++ solution by adding zinc concentrate; e. neutralizing the acidity of the solution with calcine; h. oxidizing iron and precipitating jarosite, free of contaminating solids, by injecting oxygen or oxygen-enriched air and adding an alkali or an alkaline salt. Additionally, after the neutralizing step (e), there can be a releaching step (f) with the residue for precipitating arsenic and similar impurities, and a cementation of Cu step (g), and after step (c), a step (i) of reducing iron and of direct leaching.
IPC Classes ?
- C22B 19/20 - Obtaining zinc otherwise than by distilling
- C22B 3/00 - Extraction of metal compounds from ores or concentrates by wet processes
- C22B 1/02 - Roasting processes
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