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A method and device for leaching zinc leaching slag with sulfur dioxide controlled potential method
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A zinc leaching slag and sulfur dioxide technology, applied in the field of hydrometallurgy, can solve the problems of low leaching rate of valuable metals, complex process flow, low utilization rate of concentrates, etc. Effect of loss of valence metal
Active Publication Date: 2017-11-10
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
At present, the commonly used method is to use zinc sulfide concentrate to reduce the ferric ions in the leaching solution under acidic conditions. However, due to the low utilization rate of the concentrate, it is necessary to add excessive zinc concentrate, which will easily lead to the formation of sulfide in the copper in the hot acid leaching solution. Copper precipitates into the reduction slag, and the unreacted remaining zinc concentrate needs special treatment, resulting in the low leaching rate of valuable metals such as zinc, indium, and copper in the material, complex process flow, and high energy consumption in this method.
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Embodiment 1
[0026] The method for leaching zinc leaching slag with sulfur dioxide controlled potential method, its concrete steps are as follows:
[0027] (1) First, mix 1000g of zinc leaching slag and zinc concentrate according to the mass ratio of 5:1, and then perform pulping to obtain a pulped material; the composition of zinc leaching slag and zinc concentrate is shown in Table 1;
[0028] Table 1 Contents of main chemical components (wt.%)
[0029]
[0030] (2) Add the pulped material obtained in step (1) to liquid-solid ratio of 6:1mL / g into the post-hydrolysis zinc electrolysis solution containing sulfuric acid 180g / L, and inject 0.1MPa sulfur dioxide at a temperature of 90°C Gas, react for 4h under stirring conditions, control the system and terminal potential 300mv during the whole process, and obtain Fe after the reaction is completed 3+ Less than 3g / L leachate.
[0031]In the present embodiment, the leaching rate of zinc is 98.1%, the leaching rate of indium is 96.2%, the...
Embodiment 2
[0035] The method for leaching zinc leaching slag with sulfur dioxide controlled potential method, its concrete steps are as follows:
[0036] (1) First, mix 1000g of zinc leaching slag and zinc concentrate according to the mass ratio of 8:1, and then perform pulping to obtain a pulped material; the composition of zinc leaching slag and zinc concentrate is shown in Table 1;
[0037] (2) Add the pulped material obtained in step (1) to liquid-solid ratio of 8:1mL / g into the post-hydrolysis zinc electrolysis solution containing sulfuric acid 150g / L, and inject 0.3MPa sulfur dioxide at a temperature of 120°C Gas, react for 3h under stirring conditions, control the system and terminal potential 400mv during the whole process, and obtain Fe after the reaction is completed 3+ Less than 3g / L leachate.
[0038] In the present embodiment, the leaching rate of zinc is 98.3%, the leaching rate of indium is 96.3%, the leaching rate of copper is 97.2%, and the Fe in the leaching solution ...
Embodiment 3
[0042] The method for leaching zinc leaching slag with sulfur dioxide controlled potential method, its concrete steps are as follows:
[0043] (1) First, mix 1000g of zinc leaching slag and zinc concentrate according to the mass ratio of 10:1, and then perform pulping to obtain slurry material; the composition of zinc leaching slag and zinc concentrate is shown in Table 1;
[0044] (2) Add the pulped material obtained in step (1) to the liquid-solid ratio of 10:1mL / g into the post-hydrolysis zinc electrolysis solution containing sulfuric acid 130g / L, and inject 0.3MPa sulfur dioxide at a temperature of 100°C Gas, react for 2h under stirring conditions, control the system and end potential 500mv during the whole process, and obtain Fe after the reaction is completed 3+ Less than 3g / L leachate.
[0045] In the present embodiment, the leaching rate of zinc is 98.6%, the leaching rate of indium is 96.1%, the leaching rate of copper is 97.5%, and the Fe in the leaching solution 3...
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Abstract
The invention relates to a method and a device for leaching zinc leaching residue through sulfur dioxide and a potential controlling method, and belongs to the technical field of hydrometallurgy. The method is characterized in that the zinc leaching residue and zinc concentrate are mixed and pulped, then sulfur dioxide gas is charged at the temperature of 90 to 120 DEG C, and all materials are reacted for 2 to 4 hours under the stirring condition, so as to enable hot-acid reduction leaching of the pulped material, wherein the system is controlled and the end-point potential is controlled to be 300 to 500mv in the whole process; leaching liquid in which Fe<3+> is less than 3g / L can be obtained after the reaction is finished. The device comprises an I-grade cylindrical reactor and an II-grade cylindrical reactor which both comprise stirring devices, reaction chambers, annular gas charging chambers, gas exhausting chambers and ore pulp discharging ports, wherein the reaction chamber of the I-grade reaction chamber communicates with the reaction chamber of the II-grade reaction chamber through an ore pulp overflowing port according to a height difference pipeline; the II-grade gas exhausting chamber of the II-grade reaction chamber is connected to an annular pipeline of the annular I-grade gas charging chamber in the I-grade reaction chamber through a sulfur dioxide gas reflowing pipe. With the adoption of the method and the device, the leaching rate of valuable metals can be improved, and the process can be simplified.
Description
technical field [0001] The invention relates to a method and a device for leaching zinc leaching slag by using sulfur dioxide to control the potential method, and belongs to the technical field of hydrometallurgy. Background technique [0002] Sphalerite is an important zinc mineral resource. During its mineralization process, iron and indium replace zinc atoms in sphalerite with isomorphism. It is difficult to separate zinc, iron and indium by mechanical grinding and beneficiation. , leading to the zinc concentrate produced by mineral processing contains high iron content, and associated with high content of indium, copper and other metals. The iron associated in the zinc concentrate will inevitably produce a large amount of zinc ferrite and a small amount of ferrite of other valuable metals during the roasting process of the zinc sulfide concentrate. The zinc ferrite will not be destroyed in the neutral leaching process. The dissolved zinc oxide and almost all of the iron...
Claims
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