A kind of processing method of sodium formazan cobalt slag
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A technology of fumei sodium cobalt slag and process method, which is applied in the direction of improving process efficiency and can solve the problems of high equipment investment and production cost
Active Publication Date: 2022-05-17
铜陵有色金属集团股份有限公司 +1
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[0007] The technical problem to be solved in the present invention is that the existing process equipment investment and production cost of processing formamic cobalt slag are high, and a kind of process method for processing formamic cobalt slag with low equipment investment and production cost is provided for this reason
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Embodiment 1
[0026] Example 1: Zinc was eluted with low-acid acid elution for the cobalt slag of forma in the composition table 1, the liquid-solid ratio (mL / g) was 1:1, normal temperature, the leaching time was 0.5 h, the temperature was 40°C, and the acidity of sulfuric acid was 100g / L, the extraction rate of zinc and iron is 97.2%, 92.4%; cobalt and cadmium are hardly dissolved (cobalt, cadmium and precipitant sodium formex are strongly chelated), the pickling slag contains 26.65% cobalt, and the slag rate is 24.7%;
[0027] Roasting of pickling slag: 200g of pickling slag, 10wt% sodium persulfate, 200°C calcination time, 0.5h calcination time; sulfation slag roasting at 300°C calcination temperature, 0.5h calcination time, calcination slag The rate is 30.78%;
[0028] Water leaching includes adding water to the crude cobalt sulfate obtained by roasting at a liquid-solid ratio of 10:1 for stirring and leaching. The reaction temperature is 90°C and the time is 2 hours. The slurry is vac...
Embodiment 2
[0032] Example 2: Carry out low-acid acid elution on the cobalt slag of sodium formazan in the composition table 1, the liquid-solid ratio (mL / g) is 10:1, normal temperature, the leaching time is 2 h, the temperature is 70 ℃, and the acidity of sulfuric acid is 10g / L, the extraction rate of zinc and iron is 97.32% and 91.36%; cobalt and cadmium are almost not dissolved (cobalt, cadmium and precipitant sodium formex are strongly chelated), and the pickling slag contains 26.97% cobalt.
[0033] Oxidative roasting of pickling slag: pickling slag 200g, sodium persulfate added at 30wt%, roasting temperature 300 °C, roasting time 1 h; then heat up for sulfation roasting: roasting temperature 500 °C, roasting time 2 h, roasting The slag rate is 31.5%;
[0034] Water leaching includes adding water to the crude cobalt sulfate obtained by roasting at a liquid-to-solid ratio of 1:1 for stirring and leaching. The reaction temperature is 40°C and the time is 0.5h. The slurry is vacuum fil...
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Abstract
The invention discloses a process method for treating cobalt slag of formazan, which comprises the following steps: (1), acid washing and zinc removal, (2), roasting, (3), water immersion, (4), extraction and purification, ( 5) Precipitation of ammonium oxalate, (6) Calcination of cobalt oxalate, the calcination includes adding 10-30wt% sodium persulfate to the pickling slag obtained by pickling and dezincification, after one stage of calcination, the temperature is raised for a second stage of calcination. The beneficial effect of the invention is that in the pickling process, most of the zinc can be recovered by pickling under normal pressure and low pressure, without using high-temperature pressure leaching and other strengthening means, which reduces equipment investment and production costs. Sodium sulfate is used as a roasting additive. It decomposes to generate oxygen to provide an enhanced oxidizing atmosphere for thermal decomposition. The generated sodium sulfate replaces the commonly used concentrated sulfuric acid, reduces the generation of acid mist, and can also destroy the dense oxide film formed on the surface of the ore particles, so that the oxidation of the inner layer Cobalt continues to contact with O2, SO2, SO3, so as to achieve complete sulfation and improve the recovery rate of cobalt.
Description
technical field [0001] The invention relates to the field of comprehensive utilization of nonferrous metals, in particular to a process method for processing formex cobalt slag. Background technique [0002] In the production process of zinc hydrometallurgy, the impurities in the zinc sulfate leaching solution that affect the product quality mainly include copper, cadmium, cobalt, nickel, arsenic, antimony, germanium and other elements. For copper, cadmium, arsenic, antimony, and germanium, zinc powder is commonly used in existing production to remove them, and the process is relatively mature. However, nickel and cobalt are difficult to remove. At present, the methods for removing nickel and cobalt used in the leachate purification process at home and abroad are mainly zinc powder replacement method and organic reagent method. The specific cobalt removal methods mainly include zinc powder-arsenic salt method, zinc powder-antimony salt method, xanthate method, and β-naphthi...
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