Method for recycling platinum and rhodium from binary aqua regia insoluble slag
A binary aqua regia, water-insoluble technology, applied in the field of precious metal recovery, can solve the problems of dangerous operation process, poor separation effect, lengthy process flow, etc., and achieve the effect of good working environment, simple equipment requirements and simple process
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Embodiment 1
[0016] A method for reclaiming platinum rhodium from binary aqua regia insoluble slag, comprising the following steps: (1) pretreatment: fully mixing binary aqua regia insoluble slag and barium peroxide according to a weight ratio of 1:4.2, and then The mixture is roasted at 800°C, cooled and then dissolved with hydrochloric acid; (2) Sodium conversion: Add sodium chloride equivalent to 0.6 times the weight of the precious metal to the above solution, boil it and add water to dilute to 30g / L; (3) Sponge platinum Production: add solid ammonium chloride to the above solution to precipitate platinum, the amount of addition is calculated as 100 grams of platinum needs 50 grams of ammonium chloride, heat and filter after fully reacting, the yellow precipitate produced is washed with 5% ammonium chloride solution, Then put the precipitate into pure water, add 1 kg of precipitate to 70 liters of pure water, add hydrazine hydrate to reduce platinum after heating to 85°C, 0.65 ml of hyd...
Embodiment 2
[0019] A method for reclaiming platinum rhodium from binary aqua regia insoluble slag, comprising the following steps: (1) pretreatment: fully mixing binary aqua regia insoluble slag and barium peroxide according to a weight ratio of 1:6.5, and then Roast the mixture at 950°C, add hydrochloric acid to dissolve after cooling; (2) sodium chloride: add sodium chloride equivalent to 0.7 times the weight of the precious metal to the above solution, add water to dilute to 50g / L after boiling; (3) sponge platinum Preparation: add solid ammonium chloride to the above solution to precipitate platinum, the amount of addition is calculated as 100 grams of platinum needs 60 grams of ammonium chloride, heat and filter after fully reacting, the yellow precipitate produced is washed with 10% ammonium chloride solution, Then put the precipitate into pure water, add 1 kg of precipitate to 90 liters of pure water, add hydrazine hydrate to reduce platinum after heating to 95°C, 0.8 ml hydrazine h...
Embodiment 3
[0022]A method for reclaiming platinum rhodium from binary aqua regia insoluble slag, comprising the following steps: (1) pretreatment: fully mixing binary aqua regia insoluble slag and barium peroxide according to a weight ratio of 1:4.2, and then The mixture is roasted at 950°C, cooled and then dissolved with hydrochloric acid; (2) Sodium conversion: add sodium chloride equivalent to 0.6 times the weight of the precious metal to the above solution, boil it and add water to dilute to 40g / L; (3) Sponge platinum Production: add solid ammonium chloride to the above solution to precipitate platinum, the amount of addition is calculated as 100 grams of platinum needs 50 grams of ammonium chloride, heat and fully react and filter, the yellow precipitate produced is washed with 7% ammonium chloride solution, Then put the precipitate into pure water, add 1 kg of precipitate to 70 liters of pure water, heat to 90°C, add hydrazine hydrate to reduce platinum, 0.65 ml of hydrazine hydrate...
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