Recovery of zinc from zinc sulphides by direct pressure leaching专利检索-木质颗粒生物质可再生能源燃料种类专利检索查询-专利查询网

Recovery of zinc from zinc sulphides by direct pressure leaching

阅读：900发布：2023-07-02

专利汇可以提供Recovery of zinc from zinc sulphides by direct pressure leaching专利检索，专利查询，专利分析的服务。并且Rapid and substantially complete extraction of zinc from zinc and iron containing sulphides is obtained by leaching the sulphides under oxidizing conditions at a temperature above the melting point of sulphur with an aqueous sulphuric acid solution containing at least the stoichiometric amount of acid required to combine with the zinc content of the sulphides as zinc sulphate and, also, containing an additive which is effective to prevent or at least substantially inhibit the molten sulphur from occluding unleached zinc sulphide particles thereby enabling the leaching reaction to continue until substantially all zinc values are extracted. Additives which are suitable for the process include lignins, lignosulphonates, tannin compounds, particularly quebracho, and other tree bark extracts, and alkylaryl sulphonates.，下面是Recovery of zinc from zinc sulphides by direct pressure leaching专利的具体信息内容。

权利要求

1. THE PROCESS FOR EXTRACTING ZINC FROM IRON CONTAINING ZINCIFEROUS MINERAL SULPHIDES WHICH COMPRISES THE STEPS OF DISPERSING FINELY DIVIDED IRON CONTAINING ZINCIFEROUS SULPHIDES IN AN AQUEOUS SULPHUR ACID SOLUTION TO FORM A SLURRY; ADJUSTING THE RELATIVE AMOUNTS OF ACID AND SAID SULPHIDES IN THE SLURRY SUCH THAT THERE IS AT LEAST SUFFICIENT ACID PRECENT TO COMBINE WITH THE ZINC CONTENT OF SAID SULPHIDES AS ZINC SULPHATE, PROVIDING IN SAID SLURY AN EFFECTIVE AMOUNT OF A SURFACE ACTIVE COMPOUND COMPATIBLE WITH THE ACID SULPHATE LEACH SOLUTION WHICH IS OPERATIVE, UNDER THE REACTION CONDITIONS OF THE FOLLOWING OXHGEN REACTION STEP, TO RENDER SAID SULPHIDES WETTABLE BY AQUEOUS ACID SOLUTION IN PREFERENCE TO MOLTEN SULPHUR, REACTING THE SLURRY WITH FREE OXYGEN BEARING GAS IN A CLOSED REACTION VESSEL AT A TEMPERATURE ABOVE THE MELTING POINT OF SULPHUR BUT BELOW THAT TEMPERATURE AT WHICH ANY SUBSTANTIAL PORTION OF THE SULPHIDE SULPHUR IS OXIDIZED TO SULPHATE FORM, CONTINUING SAID REACTION WITH ACTIVE AGITATION TO EFFECT SUBSTANTIALLY COMPLETE EXTRACTION OF ZINC VALUES FROM SAID SULPHIDES AS SOLUBLE ZINC SULPHATE WITH CONCURRENT CONVERSION OF SULPHIDE SULPHUR ASSOCIATED WITH SAID ZINC VALUES TO ELEMENTAL FROM, AND SEPARATING PRODUCT LEACH SOLUTION CONTAINING DISSOLVED ZINC VALUES FROM THE UNDISSOLVED RESIDUE.

2. The process according to claim 1 wherein the leached slurry is treated with oxygen and an acid neutralizing reagent to lower the free acid content thereof to about 1.5 g.p.l. and to precipitate dissolved iron therefrom.

3. The process according to claim 2 wherein the acid neutralizing reagent is calcined zinc sulphide concentrate.

4. The process according to claim 3 wherein the calcined zinc sulphide concentrate is added to the leach end slurry prior to its discharge from the reaction vessel.

5. The process according to claim 1 wherein said surface active compound is at least one member of the group consisting of lignins, lignosulphonates, tannins and alkylaryl sulphonates.

6. The process according to claim 5 wherein from about 0.1 to about 1.0 g.p.l. of said compound is added to said slurry.

7. The process according to claim 1 wherein the acid to zinc Molar ratio in said slurry is adjusted to between about 1.0:1 and about 1.2:1 and said reaction with free oxygen bearing gas is carried out at a temperature within the range of about 125*C. to about 175*C. under an oxygen partial pressure between about 5 p.s.i. and about 100 p.s.i.

8. The process according to claim 7 wherein the acid to zinc molar ratio is maintained at about 1.1:1, the temperature at about 150*C. and the oxygen partial pressure between about 25 and about 50 p.s.i.

9. The process according to claim 5 wherein said surface active compound is quebracho.

10. The process according to claim 5 wherein said surface active compound is calcium lignosulphonate.

11. The process according to claim 5 wherein said surface active compound is sodium lignosulphonate.

12. The process according to claim 5 wherein said surface active compound is ammonium lignosulphonate.

13. The process according to claim 5 wherein said surface active compound is an arylalkyl sodium sulphonate.

14. The process according to claim 1 wherein the dissolved zinc is recovered from the leach solution by electrolysis and the electrolysed solution is recycled to the slurry forming step.

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Recovery of zinc from zinc sulphides by direct pressure leaching

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