CN110964918A - Recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium - Google Patents
Recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium Download PDFInfo
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- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
- C22B3/10—Hydrochloric acid, other halogenated acids or salts thereof
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- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
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- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
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Abstract
The invention discloses a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium, which is implemented according to the following steps: step 1, performing acid leaching on platinum-palladium concentrate to obtain acid leaching solution and acid leaching slag; step 2, reducing the acid leaching solution obtained in the step 1 to obtain coarse tellurium powder; pulping, heating and chlorinating the acid leaching residue in sequence; step 3, adjusting the pH value of the chloridized liquid which is pulped and heated in the step 2 and is chloridized to be 1-2, and filtering the chloridized liquid to obtain hydrolysate; step 4, performing gold precipitation on the hydrolysate obtained in the step 3 to obtain crude gold powder and gold precipitation liquid; step 5, heating the gold precipitation solution obtained in the step 4, adding sodium sulfite to precipitate platinum and palladium, continuously heating and preserving heat, and filtering to obtain crude platinum and palladium; the method comprehensively recovers gold and tellurium in the platinum-palladium concentrate, enriches platinum and palladium, enriches the platinum and palladium by about 20 times from the platinum-palladium concentrate to acid leaching residue, and enriches the platinum and palladium by about 5 times from the acid leaching residue to crude platinum and palladium, and has high recovery efficiency.
Description
Technical Field
The invention belongs to the technical field of non-ferrous metal smelting, and particularly relates to a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium.
Background
The platinum group metal resources in China are extremely scarce, the demand of the platinum group metal is more and more large along with the rapid development of the economy in China, the platinum group metal becomes the first consumption country in the world, more than 90 percent of the platinum group metal basically needs to be imported, and therefore, the comprehensive recovery of the platinum group metal is particularly important.
In the process of comprehensively extracting rare and precious metals from copper anode slime, zinc powder is added into the solution after gold precipitation to replace platinum and palladium, and then flake caustic soda is added to neutralize the solution to obtain platinum and palladium concentrate, wherein the platinum and palladium concentrate contains rare and precious metals such as gold, platinum, palladium, tellurium and the like, the platinum and palladium contents are low, the platinum and palladium concentrate can be extracted after enrichment, and the gold content in the platinum and palladium concentrate is about 5kg/t, the platinum content is about 150g/t, the palladium content is about 1kg/t, and the tellurium content is about 20%. Therefore, a method for comprehensively recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium is needed.
Disclosure of Invention
The invention aims to provide a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium, and the method has high recovery rate and good recovery effect.
The technical scheme adopted by the invention is that,
a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium is implemented according to the following steps:
step 1, performing acid leaching on platinum-palladium concentrate to obtain acid leaching solution and acid leaching slag;
step 2, reducing the acid leaching solution obtained in the step 1 to obtain coarse tellurium powder; pulping, heating and chlorinating the acid leaching residue in sequence;
step 3, adjusting the pH value of the chloridized liquid which is pulped and heated in the step 2 and is chloridized to be 1-2, and filtering the chloridized liquid to obtain hydrolysate;
step 4, performing gold precipitation on the hydrolysate obtained in the step 3 to obtain crude gold powder and gold precipitation liquid;
and 5, heating the gold precipitation solution obtained in the step 4, adding sodium sulfite to precipitate platinum and palladium, continuously heating and preserving heat, and filtering to obtain crude platinum and palladium.
The present invention is also characterized in that,
the specific method for performing acid leaching on the platinum-palladium concentrate in the step 1 comprises the following steps: adding the platinum-palladium concentrate into industrial hydrochloric acid for acid leaching, wherein the volume ratio of the industrial hydrochloric acid to the platinum-palladium concentrate is 3-5: 1, the temperature of acid leaching is 30-50 ℃, and the time is 4-8 h.
The specific method for reducing the pickle liquor in the step 2 comprises the following steps: adding industrial sodium sulfite into the pickle liquor for reduction at 70-80 ℃.
The specific method for chlorinating the acid leaching residue in the step 2 comprises the following steps: adding industrial hydrochloric acid into the acid leaching residue after slurrying and heating, uniformly stirring, and then adding industrial sodium chlorate for chlorination until white residue is generated.
The volume ratio of the industrial hydrochloric acid to the acid leaching residue in the chlorination in the step 2 is 8-10: 1, the temperature is 80-90 ℃.
The concentration of the industrial hydrochloric acid in the chlorination in the step 2 is 1.5-3 mol/L.
In the step 3, caustic soda flakes are added into the acid leaching residue to adjust the pH value, and the temperature is controlled to be 20-40 ℃.
The specific method for performing gold precipitation on the hydrolysate in the step 4 comprises the following steps: adding industrial hydrochloric acid into the hydrolysate until the pH value is 0.5, and adding industrial sodium sulfite to carry out gold precipitation until no gold powder is generated in a small test.
The temperature of gold precipitation in the step 4 is 40-60 ℃.
In the step 5, the gold precipitation liquid is heated to 60-80 ℃, the addition of industrial sodium sulfite accounts for 25-30% of the mass of the acid leaching residue, the later temperature rise is 90-95 ℃, and the heat preservation time is 2-4 h.
The method has the beneficial effects that the gold and tellurium in the platinum-palladium concentrate are comprehensively recovered, the platinum and palladium are enriched, the platinum and palladium can be enriched by about 20 times from the platinum-palladium concentrate to the acid leaching residue, the platinum and palladium can be enriched by about 5 times from the acid leaching residue to the crude platinum and palladium, the platinum content in the crude platinum and palladium is about 1.5 percent, the palladium content in the crude platinum and palladium is about 10 percent, and the recovery efficiency is high.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium, which is implemented according to the following steps:
step 1, adding platinum-palladium concentrate into industrial hydrochloric acid for acid leaching to obtain acid leaching solution and acid leaching slag; wherein, the volume ratio of the industrial hydrochloric acid to the platinum-palladium concentrate is 3-5: 1, pickling at 30-50 ℃ for 4-8 h;
step 2, reducing the acid leaching solution obtained in the step 1 to obtain coarse tellurium powder; pulping, heating and chlorinating the acid leaching residue in sequence;
the specific method for reducing the pickle liquor comprises the following steps: adding industrial sodium sulfite into the pickle liquor for reduction at the temperature of 70-80 ℃;
the specific method for chlorinating the acid leaching residue comprises the following steps: adding industrial hydrochloric acid into the acid leaching residue after slurrying and heating, uniformly stirring, and then adding industrial sodium chlorate for chlorination until white residue is generated;
the volume ratio of the industrial hydrochloric acid to the acid leaching residue during chlorination is 8-10: 1, the temperature is 80-90 ℃, and the concentration of industrial hydrochloric acid is 1.5-3 mol/L;
step 3, adding caustic soda flakes into the chlorination liquid to adjust the pH value of the chlorination liquid which is pulped, heated and chlorinated in the step 2 to be 1-2, and filtering the chlorination liquid to obtain hydrolysate;
step 4, performing gold precipitation on the hydrolysate obtained in the step 3 to obtain crude gold powder and gold precipitation liquid;
step 5, heating the gold precipitation solution obtained in the step 4 to 60-80 ℃, adding sodium sulfite to precipitate platinum and palladium, continuously heating to 90-95 ℃, preserving heat for 2-4 hours, and filtering to obtain crude platinum and palladium; wherein the addition amount of the industrial sodium sulfite is 25 to 30 percent of the mass of the acid leaching residue.
Compared with the existing preparation method, the invention mainly has the following technical advantages: the method comprehensively recovers gold and tellurium in the platinum-palladium concentrate, enriches platinum and palladium by about 20 times from the platinum-palladium concentrate to acid leaching residue, enriches platinum and palladium by about 5 times from the acid leaching residue to crude platinum and palladium, contains 1.5 percent of platinum and 10 percent of palladium, and has high recovery efficiency.
Example 1
The embodiment 1 of the invention provides a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium, which comprises the following specific implementation methods: 2t of platinum-palladium concentrate is added to 8m3In industrial hydrochloric acid, acid leaching is carried out for 4 hours at 40 ℃, tellurium, copper, bismuth and other base metals enter a solution, and gold, platinum and palladium are retained in acid leaching residues; after plate-and-frame filter pressing, heating the pickle liquor to 75 ℃, adding industrial sodium sulfite for reduction to obtain coarse tellurium powder until no tellurium powder is generated in a small test, and performing tellurium refining on the coarse tellurium powder; adding acid leaching residue into 1m3Slurrying in water, heating to 85 ℃, adding 200L of industrial hydrochloric acid, and slowly adding industrial sodium chlorate for chlorination until the residue is white; filter pressing by a plate frame, adding caustic soda flakes into the chlorinated solution until the pH value is 1, and hydrolyzing at 30 ℃; and then, carrying out plate-and-frame filter pressing, adding industrial hydrochloric acid into the hydrolyzed solution until the pH value is 0.5, adding industrial sodium sulfite to precipitate gold at 50 ℃ until no gold powder is generated in a small test, feeding the crude gold powder into a gold refining process, heating the solution after gold precipitation to 75 ℃, adding 25kg of industrial sodium sulfite to precipitate platinum and palladium, continuously heating to 92 ℃ and keeping the temperature for 2h, and filtering the obtained crude platinum and palladium to finish the recovery of gold and tellurium from platinum and palladium concentrate and the enrichment of platinum and palladium.
Example 2
The embodiment 2 of the invention provides a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium, which comprises the following specific implementation methods: will 25t platinum Palladium concentrate into 8m3In industrial hydrochloric acid, acid leaching is carried out for 5h at the temperature of 45 ℃, tellurium, copper, bismuth and other base metals enter a solution, and gold, platinum and palladium are retained in acid leaching residues; after plate-frame filter pressing, heating the pickle liquor to 80 ℃, adding industrial sodium sulfite for reduction to obtain coarse tellurium powder until no tellurium powder is generated in a small test, and performing tellurium refining on the coarse tellurium powder. Adding acid leaching residue into 1m3Slurrying in water, heating to 88 ℃, adding 180L of industrial hydrochloric acid, and slowly adding industrial sodium chlorate for chlorination until the residue is white; after filter pressing by a plate frame, adding caustic soda flakes into the chlorinated solution until the pH value is 1.5, and hydrolyzing at 35 ℃. Then, after plate-and-frame filter pressing, adding industrial hydrochloric acid into the hydrolyzed solution until the pH value is 0.5, adding industrial sodium sulfite to precipitate gold at the temperature of 45 ℃ until no gold powder is generated in a small test, and feeding the coarse gold powder into a gold refining process; and after the temperature of the solution after gold precipitation is raised to 70 ℃, adding 30kg of industrial sodium sulfite to precipitate platinum and palladium, continuously raising the temperature to 95 ℃, preserving the temperature for 3h, filtering to obtain crude platinum and palladium, and completing the recovery of gold and tellurium from the platinum and palladium concentrate and the enrichment of platinum and palladium.
Example 3
The embodiment 3 of the invention provides a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium, which comprises the following specific implementation methods: 2.5t of platinum-palladium concentrate is added to 8m3In industrial hydrochloric acid, acid leaching is carried out for 5h at the temperature of 45 ℃, tellurium, copper, bismuth and other base metals enter a solution, and gold, platinum and palladium are retained in acid leaching residues. After plate-frame filter pressing, heating the pickle liquor to 80 ℃, adding industrial sodium sulfite for reduction to obtain coarse tellurium powder until no tellurium powder is generated in a small test, and performing tellurium refining on the coarse tellurium powder. Adding acid leaching residue into 1m3Slurrying in water, heating to 88 ℃, adding 180L of industrial hydrochloric acid, and slowly adding industrial sodium chlorate for chlorination until the residue is white. Filter pressing by a plate frame, adding caustic soda flakes into the chlorinated solution until the pH value is 2, and hydrolyzing at 35 ℃; then, after plate-and-frame filter pressing, adding industrial hydrochloric acid into the hydrolyzed solution until the pH value is 0.5, adding industrial sodium sulfite to precipitate gold at the temperature of 45 ℃ until no gold powder is generated in a small test, and feeding the coarse gold powder into a gold refining process; after the solution after gold precipitation is heated to 70 ℃, 30kg of industrial sodium sulfite is added to precipitate platinum and palladiumAnd continuously heating to 95 ℃, preserving the heat for 3.5 hours, filtering to obtain crude platinum-palladium, and completing the recovery of gold and tellurium from the platinum-palladium concentrate and the enrichment of platinum-palladium.
Example 4
The embodiment 4 of the invention provides a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium, which comprises the following specific implementation methods: adding 3t of platinum-palladium concentrate into 8m3In the industrial hydrochloric acid, acid leaching is carried out for 5h at the temperature of 30 ℃, tellurium, copper, bismuth and other base metals enter a solution, and gold, platinum and palladium are retained in acid leaching residues. After plate-frame filter pressing, heating the pickle liquor to 70 ℃, adding industrial sodium sulfite for reduction to obtain coarse tellurium powder until no tellurium powder is generated in a small test, and performing tellurium refining on the coarse tellurium powder. Adding acid leaching residue into 1m3Slurrying in water, heating to 80 ℃, adding 180L of industrial hydrochloric acid, slowly adding industrial sodium chlorate for chlorination until the residue is white, filter-pressing by a plate frame, adding caustic soda flakes into the chlorinated solution until the pH value is 1.3, and hydrolyzing at 35 ℃; then, after plate-and-frame filter pressing, adding industrial hydrochloric acid into the hydrolyzed solution until the pH value is 0.5, adding industrial sodium sulfite to precipitate gold at the temperature of 45 ℃ until no gold powder is generated in a small test, and feeding the coarse gold powder into a gold refining process; and after the temperature of the solution after gold precipitation is raised to 60 ℃, adding 30kg of industrial sodium sulfite to precipitate platinum and palladium, continuously raising the temperature to 95 ℃, preserving the temperature for 2h, filtering to obtain crude platinum and palladium, and completing the recovery of gold and tellurium from the platinum and palladium concentrate and the enrichment of platinum and palladium.
Example 5
The embodiment 5 of the invention provides a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium, which comprises the following specific implementation methods: 2.7t of platinum-palladium concentrate is added to 8m3In industrial hydrochloric acid, acid leaching is carried out for 4 hours at 50 ℃, tellurium, copper, bismuth and other base metals enter a solution, and gold, platinum and palladium are retained in acid leaching residues. After plate-frame filter pressing, heating the pickle liquor to 80 ℃, adding industrial sodium sulfite for reduction to obtain coarse tellurium powder until no tellurium powder is generated in a small test, and performing tellurium refining on the coarse tellurium powder. Adding acid leaching residue into 1m3Slurrying in water, heating to 89 ℃, adding 180L of industrial hydrochloric acid, and slowly adding industrial sodium chlorate for chlorination until the residue is white. Filter pressing with a plate frame, adding into the chlorinated solutionAdding caustic soda flakes until the pH value is 2, and hydrolyzing at 35 ℃; then, after plate-and-frame filter pressing, adding industrial hydrochloric acid into the hydrolyzed solution until the pH value is 0.5, adding industrial sodium sulfite to precipitate gold at the temperature of 45 ℃ until no gold powder is generated in a small test, and feeding the coarse gold powder into a gold refining process; and after the temperature of the solution after gold precipitation is raised to 80 ℃, adding 30kg of industrial sodium sulfite to precipitate platinum and palladium, continuously raising the temperature to 90 ℃, preserving the temperature for 3h, filtering to obtain crude platinum and palladium, and completing the recovery of gold and tellurium from the platinum and palladium concentrate and the enrichment of platinum and palladium.
Example 6
Embodiment 6 of the present invention provides a recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium, which comprises the following specific implementation methods: 2.9t of platinum-palladium concentrate is added to 8m3In industrial hydrochloric acid, acid leaching is carried out for 8 hours at the temperature of 43 ℃, tellurium, copper, bismuth and other base metals enter a solution, and gold, platinum and palladium are retained in acid leaching residues. After plate-frame filter pressing, heating the pickle liquor to 75 ℃, adding industrial sodium sulfite for reduction to obtain coarse tellurium powder until no tellurium powder is generated in a small test, and performing tellurium refining on the coarse tellurium powder. Adding acid leaching residue into 1m3Slurrying in water, heating to 90 ℃, adding 180L of industrial hydrochloric acid, and slowly adding industrial sodium chlorate for chlorination until the residue is white. Filter pressing by a plate frame, adding caustic soda flakes into the chlorinated solution until the pH value is 1.9, and hydrolyzing at 35 ℃; then, after plate-and-frame filter pressing, adding industrial hydrochloric acid into the hydrolyzed solution until the pH value is 0.5, adding industrial sodium sulfite to precipitate gold at the temperature of 45 ℃ until no gold powder is generated in a small test, and feeding the coarse gold powder into a gold refining process; and after the temperature of the solution after gold precipitation is raised to 70 ℃, adding 30kg of industrial sodium sulfite to precipitate platinum and palladium, continuously raising the temperature to 95 ℃, preserving the temperature for 4h, filtering to obtain crude platinum and palladium, and completing the recovery of gold and tellurium from the platinum and palladium concentrate and the enrichment of platinum and palladium.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium is characterized by comprising the following steps:
step 1, performing acid leaching on platinum-palladium concentrate to obtain acid leaching solution and acid leaching slag;
step 2, reducing the acid leaching solution obtained in the step 1 to obtain coarse tellurium powder; pulping, heating and chlorinating the acid leaching residue in sequence;
step 3, adjusting the pH value of the chloridized liquid which is pulped and heated in the step 2 and is chloridized to be 1-2, and filtering the chloridized liquid to obtain hydrolysate;
step 4, performing gold precipitation on the hydrolysate obtained in the step 3 to obtain crude gold powder and gold precipitation liquid;
and 5, heating the gold precipitation solution obtained in the step 4, adding sodium sulfite to precipitate platinum and palladium, continuously heating and preserving heat, and filtering to obtain crude platinum and palladium.
2. The recovery method for recovering gold and tellurium and enriching platinum and palladium from platinum and palladium concentrate according to claim 1, wherein the specific method for performing acid leaching on the platinum and palladium concentrate in the step 1 is as follows: adding the platinum-palladium concentrate into industrial hydrochloric acid for acid leaching, wherein the volume ratio of the industrial hydrochloric acid to the platinum-palladium concentrate is 3-5: 1, the temperature of acid leaching is 30-50 ℃, and the time is 4-8 h.
3. The recovery method for recovering gold and tellurium and enriching platinum and palladium from platinum and palladium concentrate according to claim 2, characterized in that the specific method for reducing the pickle liquor in the step 2 is as follows: adding industrial sodium sulfite into the pickle liquor for reduction at 70-80 ℃.
4. The recovery method for recovering gold and tellurium and enriching platinum and palladium from platinum and palladium concentrate according to claim 3, wherein the specific method for chlorinating the acid leaching residue in the step 2 is as follows: adding industrial hydrochloric acid into the acid leaching residue after slurrying and heating, uniformly stirring, and then adding industrial sodium chlorate for chlorination until white residue is generated.
5. The recovery method for recovering gold and tellurium and enriching platinum and palladium from platinum and palladium concentrate as claimed in claim 4, wherein the volume ratio of industrial hydrochloric acid to acid leaching residue in chlorination in step 2 is 8-10: 1, the temperature is 80-90 ℃.
6. The recovery method for recovering gold and tellurium and enriching platinum and palladium from platinum and palladium concentrate as claimed in claim 5, wherein the concentration of industrial hydrochloric acid in chlorination in the step 2 is 1.5-3 mol/L.
7. The recovery method for recovering gold and tellurium and enriching platinum and palladium from platinum and palladium concentrate as claimed in claim 6, wherein the pH value is adjusted by adding caustic soda flakes to the acid leaching residue in the step 3, and the temperature is controlled to be 20-40 ℃.
8. The recovery method for recovering gold and tellurium and enriching platinum and palladium from platinum and palladium concentrate as claimed in claim 7, wherein the specific method for precipitating gold from the hydrolysate in the step 4 is as follows: adding industrial hydrochloric acid into the hydrolysate until the pH value is 0.5, and adding industrial sodium sulfite to carry out gold precipitation until no gold powder is generated in a small test.
9. The recovery method for recovering gold and tellurium and enriching platinum and palladium from platinum and palladium concentrate as claimed in claim 8, wherein the temperature of gold precipitation in the step 4 is 40-60 ℃.
10. The recovery method for recovering gold and tellurium and enriching platinum and palladium from platinum and palladium concentrate according to claim 9, wherein the gold precipitation solution is heated to 60-80 ℃ in the step 5, the addition amount of industrial sodium sulfite is 25% -30% of the mass of acid leaching residue, the later temperature rise is 90-95 ℃, and the heat preservation time is 2-4 h.
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