Arsenic removal from lead concentrate by ozone treatment and reverse flotation
AssigneeAmerican Air Liquide, Inc.
InventorSylvester Zuttah
Life of this patent
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Abstract
Method for removing arsenic mineral from a lead concentrate by reverse flotation with an ozone pre-treatment. The method comprises the steps of: receiving a slurry of the lead concentrate that has previously undergone flotation processes, bubbling ozone into the slurry of the lead concentrate to remove reagents used in previous flotation processes, adding a sulfide salt to the slurry to depress lead mineral, adding an alkali to increase the pH of the slurry, adding a collector and then a frother to the slurry for a reverse flotation processing and floating the arsenic mineral out of the lead mineral to obtain a now-purified lead concentrate.
Claims20
A method for removing arsenic mineral from a lead concentrate by reverse flotation with an ozone pre-treatment, the method comprising the steps of:
- a) receiving a slurry of the lead concentrate that has previously undergone flotation processes;
- b) bubbling ozone into the slurry of the lead concentrate to remove reagents used in previous flotation processes;
- c) adding a sulfide salt to the slurry to depress lead mineral;
- d) adding an alkali to increase the pH of the slurry;
- e) adding a collector and then a frother to the slurry for a reverse flotation processing;
- and
- f) floating the arsenic mineral out of the lead mineral to obtain a now-purified lead concentrate.
A method of for removing arsenic mineral from a lead concentrate by reverse flotation with an ozone pre-treatment, the method comprising the steps of:
- a) receiving a slurry of the lead concentrate that has previously undergone flotation processes;
- b) bubbling ozone into the slurry of the lead concentrate to remove dithiophosphinate used in previous flotation processes;
- c) adding NaHS to the slurry to depress lead mineral;
- d) adding lime to increase the pH of the slurry;
- e) adding PEX and then MIBC to the slurry for a reverse flotation processing;
- and
- f) floating the arsenic mineral out of the lead mineral to obtain a now-purified lead concentrate.
Dependencies are inferred from the claim text.