Method for efficiently recovering copper and rhenium from copper smelting waste acid

Abstract

The invention relates to the field of metal smelting and particularly relates to a method for efficiently recovering copper and rhenium from copper smelting waste acid. The method comprises the steps: filtering copper smelting waste acid serving as a raw material for the first time, heating the filtered copper smelting waste acid in a reaction tank, and detecting the initial oxidation reduction potential by using an oxidation reduction potentiometer; then, sequentially adding a flocculant and thiosulfate for reaction, and controlling the reaction time through discontinuously detecting the oxidation reduction potential in the reaction process; and finally, carrying out secondary filtration to obtain a filter residue, i.e., a copper and rhenium precipitate. By using the method, copper and rhenium in the waste acid can be thoroughly settled, the sedimentation effect is improved under the action of the flfocculant, and thus, the recovery rates of the copper and the rhenium are increased; the recovery rate of copper is higher than 95%, the recovery rate of rhenium is higher than 98%, the sedimentation rate of arsenium is relatively low and is only about 10%, and the obtained filter cake contains 2-4% of rhenium and 10-20% of copper; and meanwhile, silver and bismuth are also recovered, and the silver content is up to 2-5%, and the bismuth content is up to 6-10%.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a method for efficiently and controllably recovering copper rhenium from copper smelting waste acid. Background technique [0002] As a rare and precious metal, rhenium exists in the form of rhenium sulfide in nature, and its content in the earth's crust is very low, mainly associated with molybdenite and a small amount of copper sulfide ore. The largest use of rhenium is as a catalyst in the petrochemical industry, and its consumption accounts for more than 60% of the total consumption. Tantalum and tungsten alloys containing rhenium are considered to be the most resistant to high temperatures, and have become an important strategy in aerospace, rockets and missiles. supplies. [0003] At present, during the smelting process of the oxygen-enriched molten pool of the silver furnace, the rhenium sulfide associated in the copper sulfide ore is oxidized into volatile rhenium oxide, an...

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Problems solved by technology

[0003] At present, during the smelting process of the oxygen-enriched molten pool of the silver furnace, the rhenium sulfide associated in the copper sulfide ore is oxidized into volatile rhenium oxide, and about 80% of the rhenium oxide enters the flue gas. During the sulfuric acid purification and washing process, the flue gas The copper and rhenium in the copper smelting waste acid respectively enter into the copper smelting waste acid, and the rhenium in the copper smelting waste acid exists in the form of perrhenic acid. Since the copper concentrate purchased in the copper smelting process has a wide range of sources and complex components, the heavy metals contained in the copper smelting waste acid There are many kinds, including copper, lead, arsenic, zinc, antimony, selenium, bismuth, etc., among which copper and arsenic are the main components, and the content of rhenium fluctuates widely with the change of copper concentrate. In addition, the recovery technology of rhenium is difficult. The industry has been neglected and has not attracted attention, so that the resource eventually enters the neutralization slag and is piled up, which not only causes waste of secondary resources, but also pollutes the environment

[0004] Although the copper and rhenium in the waste acid of copper smelting are recovered in the prior art, which reduces the waste of secondary resources and environmental pollution, but due to the difficulty in controlling the reaction time and the amount of precipitant added, the sediment particles are fine and difficult to analyze. Poor water quality forms a viscous emulsion, resulting in a low recovery rate of copper rhenium

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