A method for reducing consumption of zinc powder in hydrometallurgy
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A technology of hydro-smelting zinc and zinc powder, applied in the direction of improving process efficiency, etc., can solve problems such as unstable supply of auxiliary materials, achieve the effects of improving utility, improving effective zinc utilization, and improving copper and cadmium grades
Active Publication Date: 2020-04-14
GUILIN UNIVERSITY OF TECHNOLOGY
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We proposed a process and equipment design idea for zinc powder consumption reduction, which provides a very good route for zinc smelting enterprises in terms of cost control and consumption reduction of auxiliary materials, and also solves the thorny problem of unstable supply of auxiliary materials
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Embodiment 1
[0020] (1) At a temperature of 80° C., the pH is 4, and the concentration of copper, cadmium and zinc is respectively 1000 mg / L, 200 mg / L and 150 g / L of heavy alum supernatant into the reaction tank.
[0021] (2) Put the "non" shaped stirring paddle equipped with zinc plate into the reaction tank of step (1), stir the reaction time for 0.5 hour, see Table 1 for the change of copper concentration in the solution, and the purification slag contains 10.5% zinc.
[0022] Table 1: Changes in the concentration of copper ions in the supernatant of sinking alum at 80°C under the replacement of zinc flakes
[0023]
Embodiment 2
[0025] (1) At a temperature of 70° C., the pH is 4.5, and the concentration of copper, cadmium and zinc is respectively 1000 mg / L, 200 mg / L and 150 g / L.
[0026] (2) Put the "non" shaped stirring paddle equipped with zinc plate into the reaction tank of step (1), stir the reaction time for 0.5 hour, see Table 2 for the change of copper concentration in the solution, and the purification slag contains 9.5% zinc.
[0027] Table 2: Changes in the concentration of copper ions in the supernatant of 70°C low leaching under the replacement of zinc flakes
[0028]
Embodiment 3
[0030] (1) At a temperature of 60° C., the pH is 5, and the concentration of copper, cadmium and zinc is respectively 1000 mg / L, 200 mg / L and 150 g / L of heavy alum supernatant into the reaction tank.
[0031] (2) Put the "non" shaped stirring paddle equipped with zinc plate into the reaction tank of step (1), stir the reaction time for 1 hour, the change of copper concentration in the solution is shown in Table 3, and the purification slag contains 11.2% zinc.
[0032] Table 3: Changes in the concentration of copper ions in the supernatant of sinking alum at 60°C under the replacement of zinc flakes
[0033]
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Abstract
The invention discloses a zinc powder consumption reduction method for zinc hydrometallurgy. The zinc powder consumption reduction method comprises the steps that (1), in the temperature range from 60DEG C to 95 DEG C, sunk alum supernatant or primary leach supernatant with the pH of 1.5-5.5, the copper concentration of 500-1,200 mg / L, the cadmium concentration of 200-600 mg / L and the zinc concentration of 100-150 g / L is put into a reactive tank, and the solution pH is 1.5-2.5; and (2), a stirring paddle which is shaped like a Chinese character 'fei' and provided with a zinc plate is put intothe reactive tank in the step (1), the stirring reaction time lasts 0.5-1 hour, the copper concentration in the solution is decreased to 100-250 mg / L, the zinc plate is replaced when the zinc plate is consumed to have the thickness of 0.5-0.8 mm, and the residual zinc plate is returned to a casting workshop to be repoured. According to the zinc powder consumption reduction method for the zinc hydrometallurgy, zinc powder is replaced with the zinc plate, the zinc powder consumption is reduced, the production cost is reduced, the effective zinc utilization rate is greatly increased, the cooperand cadmium grade is significantly increased, and production control in the leaching process is facilitated.
Description
technical field [0001] The invention relates to a method for reducing the consumption of zinc powder in hydrometallurgy, which belongs to the field of zinc hydrometallurgy in nonferrous metals. [0002] technical background [0003] More than 85% of the world's zinc production is produced by hydrometallurgy. The main flow of zinc hydrometallurgy process is fluidized roasting of zinc sulfide concentrate - leaching - purification - electrowinning - melting and casting - zinc ingot. Among them, the leaching process is divided into conventional leaching process, high temperature and high acid leaching jarosite iron removal process, high temperature and high acid leaching goethite iron removal process, etc. In the purification process, the main process is to remove copper, cadmium, cobalt, nickel, arsenic, antimony and other impurities in the zinc sulfate solution by using two-stage or three-stage methods such as zinc powder antimony salt, zinc powder arsenic salt, and zinc powde...
Claims
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