Process for selectively extracting palladium from crude silver
A selective, crude silver technology, applied in the direction of improving process efficiency, can solve the problems of large liquid volume processing, poor operating conditions, low palladium recovery rate, etc., to achieve good selectivity effect, high palladium enrichment rate, raw material The effect of wide applicability
Active Publication Date: 2019-11-22
XIANGNAN UNIV +1
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Problems solved by technology
Although this method is less polluting and more environmentally friendly, it has disadvantages such as large volume of liquid to be processed, low palladium recovery rate, and the need to add a large amount of hydrochloric acid in the silver precipitation stage of concentrated acid solution, resulting in poor operating conditions.
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Embodiment 3
[0029] Embodiment three of the present invention is: a kind of technique that extracts palladium from crude silver, comprises the following steps: with 1000L silver anode slime nitric acid leaching solution (Pd1.228g / L; HNO 3 128g / L; Ag232g / L) is pumped into the sinking palladium tank, the mixer is turned on, and the metal amount of palladium in the nitric acid leaching solution is calculated to be 1228g, and a nano-collector with a particle size of 20 to 50nm is added according to 5.0 times the amount of palladium metal 6140g, reacted at room temperature (25°C) for 60 minutes and separated liquid and solid, palladium was selectively enriched into the palladium concentrate, after sampling and analysis of the palladium-removed liquid, the residual palladium was 8.9mg / L, palladium-enriched The rate is as high as 99.28%. The palladium concentrate produced 1182.45g of 99.9% palladium sponge after subsequent purification, and the recovery rate of palladium was about 96.29%.
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The invention discloses a process for selectively extracting palladium from crude silver. The process includes the following steps of adding a trapping agent into a palladium-containing solution obtained after crude silver electrolysis according to the (4.8-5.2) times of the palladium metal amount; performing solid-liquid separation operation after an enrichment reaction is made for (0.5-1.5) h, and collecting a solid phase part which is palladium concentrates, wherein the structural formula of the trapping agent can be seen in the specification. By means f the scheme, sponge palladium can beefficiently and selectively extracted from the crude silver, and the technology has no pollution to the environment, is free of three-waste emission, can achieve clean production, is simple in processes, easy and convenient to operate, good in selective effect on the palladium and high in palladium enrichment rate and has wide applicability to raw materials and strong practicability; and comparedwith a traditional method, the process has significant economic benefits and enables industrialized continuous production to be easily achieved.
Description
technical field [0001] The invention relates to the technical field of environmental protection, in particular to a process for selectively extracting palladium from crude silver. Background technique [0002] Palladium is a commonly used metal with huge consumption in industrial and agricultural production such as iron and steel, chemicals and species materials. However, palladium reserves on the earth are scarce, and it is difficult to mine and smelt. It belongs to the series of rare and precious metals. Therefore, the enrichment, extraction, or recovery of palladium from metallurgical processes or electronic product waste has important economic and environmental benefits. [0003] Since palladium is a rare metal, in the smelting system, most palladium enters the anode slime along with other metals. During the silver extraction process of anode slime smelting, palladium is usually enriched in crude silver. About 60% palladium of crude silver enters the silver electrolysi...
Claims
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IPC IPC(8): C22B11/00C22B3/44
CPCC22B3/44C22B11/04Y02P10/20
Inventor 李家元谢兆凤
Owner XIANGNAN UNIV