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A method for segmentally recovering precious metals from waste liquid containing precious metals
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A precious metal recovery and precious metal technology, applied in the field of metallurgical technology, can solve the problems of low recovery rate, incomplete precipitation of precious metals, etc., and achieve the effect of efficient separation
Active Publication Date: 2019-12-31
JINCHUAN GROUP LIMITED
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[0003] In order to overcome the problems of incomplete precipitation of precious metals and low recovery rate in the waste water produced in the precious metal refining process by metal replacement, chemical precipitation, or resin adsorption, the present invention provides a method for segmentally recovering precious metals from waste liquid containing precious metals. Methods
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Embodiment 1
[0020] Hydrazine hydrate is adjusted to pH = 6 with hydrochloric acid in advance, and 2 liters of ammonium chloride platinum precipitation mother liquor produced in the process of dissolving aqua regia - ammonium chloride repeated precipitation method (chemical precipitation method) is taken, and the total amount of precious metals in the platinum precipitation mother liquor is calculated as 0.5mol / L, adjust the pH of the solution to 1, raise the temperature of the solution to 75°C, add hydrazine hydrate according to 1.5 times the amount of precious metal substances in the solution, react for 1 hour, cool, filter, wash the filter residue until it is neutral, and remove it to gold, platinum, palladium Recovery system, the precipitation rate of gold is 99.3%, the precipitation rate of palladium is 99.5%, and the precipitation rate of platinum is 99.4%. Continue to add hydrazine hydrate to the filtrate until the reaction is complete, control the pH of the reaction system to 5, rai...
Embodiment 2
[0022] Hydrazine hydrate is adjusted to pH = 8 with hydrochloric acid in advance, take 3 liters of precious metal-containing waste liquid produced in the gold electrolysis process, calculate the total amount of precious metal in the palladium acidification waste liquid to be 0.033mol / L, adjust the solution pH = 2, and raise the temperature of the solution to 85°C, add hydrazine hydrate according to 1.5 times the amount of precious metal substances in the solution, react for 2 hours, cool, filter, wash the filter residue to neutrality and send it to the recovery system of gold, platinum and palladium. The precipitation rate of gold is 99.4%, and the precipitation of palladium The rate is 99.2%, and the precipitation rate of platinum is 99.3%. Continue to add hydrazine hydrate to the filtrate until the reaction is complete, control the pH of the reaction system to 6, heat up to 90°C for 2 hours, cool down, filter, wash the filter residue to neutrality and go to the precious metal...
Embodiment 3
[0024] Hydrazine hydrate is adjusted to pH=7 with hydrochloric acid in advance, and 1 liter of precious metal-containing waste liquid produced by replacing precious metal with copper powder is used to calculate the total amount of precious metal in the platinum sinking mother liquor to be 0.063mol / L, and the pH of the solution is adjusted to 3, and the solution is heated to At 80°C, add hydrazine hydrate according to 1.1 times the amount of precious metal substances in the solution, react for 1.5 hours, cool down, filter, wash the filter residue until it is neutral, and send it to the recovery system of gold, platinum and palladium. The precipitation rate of gold is 99.6%, and the precipitation of palladium The rate is 99.5%, and the precipitation rate of platinum is 99.6%. Continue to add hydrazine hydrate to the filtrate until the reaction is complete, control the pH of the reaction system to 7, raise the temperature to 88°C for 1 hour, cool down, filter, wash the filter resi...
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Abstract
The invention discloses a method for recycling precious metal from waste liquid with the precious metal in a sectional manner, and particularly relates to recycling precious metals from waste liquid with platinum group metal in a sectional manner. The waste liquid with the platinum group metal is generated by methods such as metal replacement, chemical precipitation, ion exchange, adsorption and electrolysis. The method includes steps of regulating hydrazine hydrate by the aid of hydrochloric acid until the hydrazine hydrate is weakly alkaline and the pH (potential of hydrogen) of the hydrazine hydrate is equal to 6-8; allowing the pH of the waste liquid with the precious metal to be equal to 1-2 under the control; heating solution until the temperature of the solution reaches 75-85 DEG C,adding the hydrazine hydrate into the solution according to certain weight, allowing the pH of reaction systems to be equal to 1-2 under the control, carrying out reaction for 1-2 h, then cooling andfiltering reaction products and washing filter residues until the filter residues are neutral and gold, platinum and palladium systems can be recycled from the precious metal; replenishing the hydrazine hydrate into filter liquid to obtain mixed liquid, filtering the mixed liquid and washing filter residues until the filter residues are neutral and rhodium and iridium systems can be recycled fromthe precious metal. The certain weight of the hydrazine hydrate added into the solution is 1.5-2 times the quantity of precious metal substances in the solution. The method has the advantages that the precious metal precipitation efficiency is higher than 99%; the precious metal can be efficiently separated from base metal, the precious metal in the residues is high in content, and the method canbring convenience for secondarily separating and purifying the precious metal.
Description
technical field [0001] The invention belongs to the field of metallurgical technology and relates to the recovery of precious metals, in particular to a method for segmentally recovering precious metals from platinum group metal waste liquid produced by metal replacement, chemical precipitation, ion exchange, adsorption and electrolysis. Background technique [0002] The waste water produced in the precious metal refining process often contains a certain amount of precious metal elements such as Au, Pd, Pt, Rh, Ir, etc. Generally, the methods of recovering precious metals from precious metal waste liquid mainly adopt metal replacement, chemical precipitation, or resin adsorption and other methods. While the metal replacement method enriches and recovers precious metals, it will also be polluted by various reagents due to the recovered slag, resulting in 2-3 times longer precious metal refining process and 3-4 times more refining times; currently, chemical precipitation method...
Claims
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Application Information
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