Vitriol precipitating and Fe removing process in zinc hydrometallurgy technology

A hydrometallurgical zinc smelting and process technology is applied in the application field of the oxidant in the process of removing iron from heavy alum, which can solve the problems of high sulfur and ferrous content, energy loss, etc., and achieves low cost, reduced power consumption, and improved electrolysis current efficiency. Effect

Active Publication Date: 2014-05-07
BAIYIN NONFERROUS GROUP
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  • Description
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Problems solved by technology

[0003] Zinc ore often contains high amounts of sulfur and ferrous iron, which leads to the need to add more manganese powder in the acidic leaching solution, so that the content of manganese ions in the solution rises linearly, and the highest content measured during production reaches 24g / l. In order to remove manganese ions Make the unit consumption of electrolytic electricity reach 3400Kwh / t.Zn, resulting in energy loss

Method used

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  • Vitriol precipitating and Fe removing process in zinc hydrometallurgy technology
  • Vitriol precipitating and Fe removing process in zinc hydrometallurgy technology
  • Vitriol precipitating and Fe removing process in zinc hydrometallurgy technology

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Effect test

Embodiment 1

[0047] Fe in supernatant of heavy alum 2+ The content is 0.6~1.34g / l, adjust PH=4.0, temperature: 70°C, add H equal to 1.6 times the theoretical amount from the bottom of the sinking alum supernatant 2 o 2 solution, the reaction time is 40min, and the iron removal rate is shown in Table 6:

[0048]

Embodiment 2

[0050]The addition of manganese powder is 60% of the theoretical addition, H 2 o 2 When the amount of oxidant added is 1.1 to 1.3 times the theoretical amount 2 o 2 Oxidant industrial test data, the reaction conditions are: PH value of supernatant of heavy alum: 4.0, temperature: 70°C, H 2 o 2 The solution is industrial hydrogen peroxide. The results are shown in Table 7:

[0051]

Embodiment 3

[0053] The amount of manganese powder added is 30% of the theoretical addition, H 2 o 2 The amount of oxidant added is 1.8 to 2.0 times of the theoretical amount added, and the reaction conditions are as follows: PH value of supernatant of heavy alum: 4.0, temperature: 70°C, H 2 o 2 The solution is industrial hydrogen peroxide. The results are shown in Table 8:

[0054]

[0055] As can be seen from Table 7 and Table 8, when the addition of manganese powder in the oxidation tank is 60% of the theoretical addition, H 2 o 2 When the amount of oxidant added is 1.0 to 1.3 times of the theoretical amount, the flow rate of oxidizing liquid is 220m 3 / h, heavy alum supernatant Fe 2+ 1g / l, calculated as cathode zinc 340t / d, H 2 o 2 The unit consumption of oxidant is 19.18㎏ / t.Zn, combined oxidant to Fe 2+ The oxidation rate is 92%; when the addition of manganese powder in the oxidation tank is 30% of the theoretical addition, H 2 o 2 When the amount of oxidant added is 1.8...

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Abstract

The invention relates to a vitriol precipitating and Fe removing process in a zinc hydrometallurgy technology. The vitriol precipitating and Fe removing process comprises the following steps: adjusting the pH value of vitriol precipitating supernatant, adding an oxidizing agent for reaction, adjusting the pH value of reaction liquid to 4.8-5.2, precipitating so as to removing Fe, and adjusting the pH value of the vitriol precipitating supernatant to 3.5-4.5, wherein the oxidizing agent is an H2O2 oxidizing agent or an H2O2-manganese powder combined oxidizing agent, the reaction temperature is 60-70 DEG C, and the stirring reaction time is 40-90 minutes. According to the vitriol precipitating and Fe removing process, Fe2+ is oxidized into Fe3+ by using the H2O2 oxidizing agent or the H2O2-manganese powder combined oxidizing agent, and the formed iron vitriol is removed. The iron removal by jarosite process is low in cost and capable of reducing the content of manganese ions in a system, effectively controlling the manganese ions in the system to 5-6g/l required by the process and effectively reducing systemic circulation volume and zinc content in acid leaching slag and iron vitriol slag, thereby increasing the recovery rate of zinc metal, improving the efficiency of electrolytic currents and reducing power consumption; and production processes are simplified.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal smelting, and in particular relates to the application of an oxidant in a process of sinking alum and removing iron in a zinc hydrometallurgy process. Background technique [0002] Zinc hydrometallurgy is the main method in smelting zinc. Currently, 80% of zinc production comes from the zinc hydrometallurgy process. Zinc hydrometallurgy generally includes steps such as leaching, pre-neutralization, sinking alum and iron removal, and the processes are basically the same. , the main difference is that different methods are used to remove iron. After the zinc ore is roasted, it is neutrally leached, and the leaching solution contains less iron, but the leaching rate of zinc is also very low. The current process generally uses hot acid leaching of zinc calcine, and the leaching rate of zinc is greatly improved, but a large amount of iron is also leached into the solution. Manganese powder is added t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B19/00
Inventor 柳忠宝刘安强马学强张海峰匙建军
Owner BAIYIN NONFERROUS GROUP
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