Pretreatment method for platinum palladium concentrate

A pretreatment and concentrate technology, which is applied in the field of hydrometallurgy for effective pretreatment of platinum and palladium concentrates, can solve the problems of poor removal effect, loss of precious metals, low enrichment ratio of precious metals, etc., and achieves low equipment corrosion and precious metals Low content, good comprehensive recovery effect

Active Publication Date: 2013-04-17
JIANGXI COPPER
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxidation roasting-acid leaching method is to roast the platinum palladium concentrate in the air for a certain period of time at a certain temperature, then add water and hydrochloric acid and the roasted platinum palladium concentrate to the reaction kettle in a certain proportion, and add the platinum palladium concentrate after a period of reaction. The reducing agent is used to reduce and then filter; although this method can achieve a certain effect of removing impurities, it has disadvantages such as poor removal effect of selenium, tellurium and other elements, low enrichment ratio of precious metals, and acid leaching easily leads to loss of precious metals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The main components of platinum palladium concentrate are (%): Cu3.52, Pb1.61, Pt0.4972, Pd3.27, Au4.83, Bi0.21, Te34.24, Se3.33 and Ag6.19 . Take 100g of the above-mentioned platinum palladium concentrate, add 120g of sodium carbonate, 32g of sodium hydroxide, and 8g of sodium chlorate. After uniform mixing, control the temperature at 400°C. After roasting for 3 hours, add the roasted slag to 400mL of water, and adjust the stirring speed up to 500r·min -1 , reacted at room temperature for 2 hours. Filter, wash the leached slag, dry and weigh it, the alkaline leached slag weighs 40.66g, and its main components are calculated as mass percentage (%): Cu0.37, Pb2.96, Pt1.22, Pd8.02, Au11.88 , Bi0.49, Te1.23, Se0.39 and Ag14.90, the leaching rates of copper, selenium and tellurium are 95.72%, 95.27% and 98.53% respectively, and the slag rates of gold, platinum and palladium are 100% and 99.75% respectively , 99.76%.

Embodiment 2

[0017] The main components of platinum palladium concentrate are (%): Cu4.24, Pb0.31, Pt0.62, Pd4.12, Au1.62, Bi1.9, Te19.44, Se21.69 and Ag3.83 . Take 120g of the above-mentioned platinum palladium concentrate, add 168g of sodium carbonate, 40g of sodium hydroxide, and 8.4g of sodium chlorate. After uniform mixing, control the temperature at 420°C. After roasting for 4 hours, add the roasted slag to 550mL of water, adjust the stirring Speed ​​up to 600r·min -1 , reacted at room temperature for 3 hours. Filter, wash the leached slag, dry and weigh it, the alkaline leached slag weighs 39.71g, and its main components are calculated as mass percentages (%): Cu1.05, Pb0.71, Pt1.86, Pd12.40, Au4.89 , Bi4.59, Te0.25, Se7.45 and Ag11.52, the leaching rates of copper, selenium and tellurium are 95.55%, 88.63% and 95.70% respectively, and the slag rates of gold, platinum and palladium are 100% and 99.30% respectively , 99.96%.

Embodiment 3

[0019] The main components of platinum palladium concentrate are (%): Cu1.80, Pb0.84, Pt0.73, Pd6.91, Au8.52, Bi0.62, Te20.27, Se5.20 and Ag4.13 . Take 140g of the above-mentioned platinum palladium concentrate, add 210g of sodium carbonate, 55g of sodium hydroxide, and 7.2g of sodium chlorate. After uniform mixing, control the temperature at 450°C. After roasting for 3 hours, add the roasted slag to 1500mL of water, adjust the stirring Speed ​​up to 500r·min -1 , reacted at room temperature for 5 hours. Filter, wash the leached slag, dry and weigh it, the alkaline leached slag weighs 49.39g, and its main components are calculated as mass percentage (%): Cu0.34, Pb2.33, Pt2.06, Pd119.56, Au24.15 , Bi1.73, Te2.11, Se1.45 and Ag11.56, the leaching rates of copper, selenium and tellurium were 95.26%, 90.01% and 96.34% respectively, and the slag rates of gold, platinum and palladium were 100% and 99.64% respectively , 99.87%.

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Abstract

The invention provides a pretreatment method for platinum palladium concentrate. The pretreatment method comprises the following steps: mixing the platinum palladium concentrate, sodium carbonate, sodium hydroxide and sodium chlorate uniformly according to a certain ratio; roasting at certain temperate; transforming impurity elements such as copper, selenium and tellurium into corresponding oxide or corresponding salt; and adding the roasting slag into water according to a certain ratio and leaching, wherein impurities such as copper, selenium and tellurium enter the alkaline leachate, and gold, platinum and palladium are enriched in the alkaline leaching slag. Compared with the traditional pretreatment method for the platinum palladium concentrate, the pretreatment method for the platinum palladium concentrate has the advantages that oxidation roasting and water leaching are adopted, so the noble metal content of the alkaline leachate is low; the leaching rate of the impurities such as copper, selenium and tellurium is high, the copper leaching rate reaches over 95 percent, the selenium leaching rate reaches over 88 percent, and the tellurium leaching rate reaches over 95 percent; the enrichment rate of the noble metal such as gold, platinum and palladium is high, so the extraction treatment on gold, platinum and palladium in the next step is promoted; and equipment is low in corrosivity, safe in operation, good in comprehensive recycling benefit and good in operating environment.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of metallurgy, in particular to a hydrometallurgical method for effectively pretreating platinum palladium concentrate. Background technique [0002] Platinum palladium concentrate is the product of the process of extracting gold and silver from copper electrolytic anode slime. It mainly contains gold, silver, platinum, palladium, copper, zinc, lead, selenium, tellurium, bismuth and other metals, and is an important raw material for extracting precious metals. In order to extract the precious metals in the platinum palladium concentrate, it is necessary to separate and recover other base metals with higher content than the precious metals, that is, to pretreat the platinum palladium concentrate before extracting the precious metals, and remove the impurity elements that have a great influence on the extraction process of the precious metals And further enrich precious metals, and then ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/12C22B11/00
CPCY02P10/20
Inventor 黄绍勇欧阳辉王日邓成虎陈善文
Owner JIANGXI COPPER
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