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Desulfurization method for acid leaching process of manganese-rich slag

A manganese-rich slag and acid leaching technology, applied in the field of acid leaching manganese-rich slag, can solve problems such as affecting health, polluting the environment, hydrogen sulfide gas escape, etc., and achieves the suppression of hydrogen sulfide production, low cost, and easy operation Effect

Inactive Publication Date: 2011-11-23
CHONGQING UNIV
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Problems solved by technology

Therefore, for manganese-rich slag with high sulfur content (for example, about 2%), the existing acid leaching method will cause more hydrogen sulfide gas to escape, which not only pollutes the environment due to its bad smell, but more seriously affected people's health

Method used

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  • Desulfurization method for acid leaching process of manganese-rich slag
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  • Desulfurization method for acid leaching process of manganese-rich slag

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Embodiment Construction

[0013] A desulfurization method in the process of acid leaching manganese-rich slag, the leaching agent in the method is sulfuric acid solution, and the mass percentage of sulfur in the manganese-rich slag is 0.55-2.0%. In the inventive method, comprise the steps:

[0014] (1) Put pyrolusite with a manganese dioxide content of 30% to 40% into the leaching tank, add sulfuric acid solution, and stir at a constant speed at room temperature; wherein, the concentration of sulfuric acid solution is 2 to 4mol / L, pyrolusite: sulfuric acid Solution=1kg: 30~40L (clear to those skilled in the art, the manganese dioxide content refers to the mass percent of manganese dioxide in pyrolusite);

[0015] (2) Then, insert two graphite electrode plates into the leaching tank, turn on the power to carry out the electrocatalytic oxidation reaction; among them, the voltage is 3-4.5V, and the anode current density is 100-300A / m 2 ;

[0016] (3) Then, in the stirring state, add manganese-rich slag ...

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Abstract

The invention relates to a desulfurization method for an acid leaching process of manganese-rich slag. In the desulfurization method, a sulfuric acid solution is used as a leaching agent and the mass percentage of sulfur in the manganese-rich slag is 0.55-2.0%. In the steps of the desulfurization method provided by the invention, three measures that pyrolusite is added and used as an oxidant, electrocatalytic oxidation is carried out by virtue of electrifying and the manganese-rich slag is added gradually in a small amount are utilized. By utilizing the three measures, the oxidation on negative divalent sulfur in the manganese-rich slag is enhanced and the oxidation reaction rate of the negative divalent sulfur is greatly increased, thus effectively inhibiting the hydrogen sulfide generation during the acid leaching process of the manganese-rich slag and reducing the environmental pollution. Meanwhile, in the desulfurization method provided by the invention, used pyrolusite powder is natural pyrolusite without any treatment, the raw materials have wide sources and low cost, the whole process is simple and convenient to operate, the reaction conditions are easy to control, the scale can be large or small and the desulfurization method has better economic and environmental benefits.

Description

technical field [0001] The invention relates to acid leaching manganese-rich slag, in particular to desulfurization in the process of acid leaching manganese-rich slag. Background technique [0002] Manganese-rich slag is the product of selective reduction of iron-manganese ore in a blast furnace or an electric furnace. Among the various elements contained in "slag", manganese occupies the highest proportion, so it is often used to produce manganese-containing products or metals. Raw material of manganese. For example, using manganese-rich slag as raw material, use acid leaching to produce manganese sulfate, manganese chloride, manganese carbonate and other manganese salts or their solutions, or prepare electrolytic manganese qualified solution containing manganese salts (to further electrolyze metal manganese). In the process of preparing manganese salt or electrolytic manganese qualified solution by acid leaching, various specific measures are adopted, the purpose is to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/08C22B47/00
CPCY02P10/20
Inventor 陶长元李敏刘作华杜军范兴陈燕周小霞刘仁龙孙大贵孙思费珊珊王冰青习苏芸张兴然
Owner CHONGQING UNIV
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