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Sulfide ore low temperature oxidation acid leaching - enhanced oxidation capacity nitric acid and nitrate

2019-09-03
Enhanced oxidizing ability - acid or slightly acid
If Nitric Acid is added to the leachate, oxidation is completed by it, and the reduced NItric Acid forms nitric oxide NO gas. In the gas phase, NO is oxidized by oxygen to NO 2 and redissolved in the solution to form nitric acid. Nitric acid becomes an electron carrier. The dissolved oxygen is only on the order of mg/L , and the concentration of nitric acid added can be very high, so their diffusion or reaction rate is much faster than the direct participation of dissolved oxygen in the reaction. Their oxidative regeneration is a homogeneous reaction, and the speed is generally fast. The electron carrier can significantly increase the reaction rate and does not consume itself, so it can be called an " oxidation catalyst " .
1984 Sunshine Mining Company (Sunshine Mining) mixing the sulfuric nitric acid leach agent for the production, handling Hui a silver-copper-containing ore, the copper-containing intermediate product silvery produced after leaching off tetrahedrite antimony. They use a discontinuous leaching method, starting temperature 90 °C And eventually rose to 150 °C Silver, copper and iron dissolve well. Silver is recovered by precipitation, by extraction of copper -have electrolytic copper electrowinning. Part of the sulfur is converted to elemental sulfur. Later, they introduced ultra-fine grinding, grinding 80% of the mineral powder to 10μm , and changing the addition of nitric acid to sodium nitrate. The plant has been in operation for 16years and was closed in the previous year due to the drop in the price of silver and antimony.

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