Technological method for removing base metals in rhodium/iridium secondary replacement residues
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A technology of secondary replacement and process method, applied in the direction of improving process efficiency, etc., can solve the problems of large dispersion of precious metal rhodium iridium, low leaching rate of base metals, etc., achieve low base metal content, increase leaching rate, and reduce dispersion loss Effect
Inactive Publication Date: 2011-06-08
JINCHUAN GROUP LIMITED
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[0003] The technical problem to be solved by the present invention is the low leaching rate of base metals and relatively large dispersion of precious metal rhodium and iridium in the secondary replacement slag control process, and provides a method for leaching base metals and enriching precious metal rhodium in a sulfuric acid medium system. A kind of technological method of removing base metal in rhodium-iridium secondary replacement slag of iridium
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Embodiment 1
[0018] (1) Put 400g of rhodium-iridium secondary replacement slag, add water and sulfuric acid, make the liquid volume 3200L according to the solid-liquid ratio of 1:8, and make the acidity of the solution 2mol / L;
[0019] (2) Stir and heat up, and when the temperature rises to 80°C, oxygen is introduced to carry out the leaching reaction. During the reaction, the temperature is controlled between 80°C and 85°C, and the oxygen flow rate is controlled at 0.6m 3 / h, filter after reacting for 30h;
[0020] (3) The filter residue was washed to neutral, and the leaching rate of the base metal was 90.4%, and the rhodium-iridium and other precious metals were enriched by 8 times for the rhodium-iridium secondary replacement residue.
[0021] Through this method, the slag is replaced twice.
Embodiment 2
[0023] (1) Put 420g of rhodium-iridium secondary replacement slag, add water and sulfuric acid, make the liquid volume 4200L according to the solid-liquid ratio of 1:10, and make the acidity of the solution 3mol / L;
[0024] (2) Stir and heat up, and when the temperature rises to 80°C, oxygen is introduced to carry out the leaching reaction. During the reaction, the temperature is controlled between 80°C and 85°C, and the oxygen flow rate is controlled at 0.8m 3 / h, filter after reacting for 40h;
[0025] (3) The filter residue was washed to neutral, and the leaching rate of base metals in the secondary replacement residue was 90.4%, and the enrichment of rhodium, iridium and other precious metals was 8 times.
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Abstract
The invention discloses a technological method for removing base metals in rhodium/iridium secondary replacement residues. The technological process comprises the following steps: adding sulfuric acid into the rhodium/iridium secondary replacement residues with certain solid-to-liquid ratio; heating and introducing oxygen to leach the base metals such as copper, nickel and the like; and after reaction, filtering and washing the filter residues to neutral so as to obtain rhodium/iridium raw material containing relatively high-grade noble metals such as rhodium, iridium and the like as well as low content of base metals. The technology realizes effective separation of noble metals and base metals in the rhodium/iridium secondary replacement residues so that the leaching rate of the base metals in the secondary replacement residues is greater than 90% and the enrichment of rhodium, iridium and other noble metals is nearly 10 times, and provides a new method for leaching and separating the base metals to enrich the noble metals rhodium and iridium.
Description
technical field [0001] The invention relates to a hydrometallurgical process technology, especially a process for separating noble and base metals from the rhodium-iridium secondary replacement slag, specifically, it can effectively remove base metals such as nickel, copper, and iron in the rhodium-iridium secondary replacement slag, and reduce the cost of precious metals. Disclosed is a process for removing base metals in rhodium-iridium secondary replacement slag for rhodium-iridium dispersion loss. Background technique [0002] The rhodium-iridium secondary replacement slag is the raw material for extracting the precious metal rhodium-iridium, in which the base metal content is high, and it needs to be leached and separated from the noble and base metals, while the traditional process uses HCl+Cl 2 Under the medium system, the secondary replacement slag is subjected to controlled potential chlorination, so that base metals such as Ni, Cu, and Fe with low redox potential a...
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