Method for purifying and removing chlorine by manganese sulfate electrolyte

A technology of electrolyte and manganese sulfate, which is applied in the field of purification and removal of chlorine in manganese sulfate solution, and in the field of hydrometallurgy. It can solve the problems of inability to be directly used as dechlorination agent, increase in treatment costs, sewage, etc., and achieve low production costs and high product quality. The effect of good quality and short process

Active Publication Date: 2018-06-29
CENT SOUTH UNIV
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Problems solved by technology

There are various problems in the traditional recycling method of dechlorination agent, such as new pollutants—chlorine ion-containing sew

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  • Method for purifying and removing chlorine by manganese sulfate electrolyte

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Embodiment 1

[0029] Bi in bismuth trioxide described in the present invention 2 o 3 The mass percentage is not less than 99.90%, industrial grade concentrated sulfuric acid (H 2 SO 4 ≥98.0%), industrial grade manganese powder (Mn≥99.0%) and manganese carbonate (MnCO 3 ≥98.0%). Stir and mix bismuth trioxide and concentrated sulfuric acid according to the mass ratio of 1 / 4, then heat up to 210°C and react for 10 minutes, stop heating after the yellow bismuth trioxide turns into white precipitate, and add the activated slag to the manganese sulfate electrolysis In the liquid, control the ratio of the activated slag mass kg to the liquid volume L to be 1 / 120, keep stirring and keep the temperature at 70°C, add manganese carbonate at the same time to maintain the pH value of the solution at the initial value of 2.30, continue to stir and react for 1.0h, and use vacuum pumping Liquid-solid separation by filtration, the chlorine ion in the purified liquid is reduced to 22mg / L, and the chlorin...

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Abstract

The invention discloses a method for purifying and removing chlorine by manganese sulfate electrolyte. The method comprises the steps that firstly, bismuth trioxide is activated in concentrated sulfuric acid to enable the bismuth trioxide to be converted into bismuth sulfate; secondly, the activating slag is added into a manganese sulfate solution, and the pH value of the solution is adjusted to an initial value by using a manganese salt, so that chloride ions in the solution are precipitated in the form of bismuth oxychloride; the residue is re-purified by using concentrated sulfuric acid toremove chlorine and realizing the regeneration of the precipitant, and finally the manganese powder is added to replace the residual bismuth ions in the purified liquid. The method comprises the following steps that firstly, bismuth oxide is converted into bismuth sulfate with relatively good activity; secondly, the characteristic that the dissolution rate of the bismuth oxychloride is small is further utilized, the chlorine in the manganese sulfate electrolyte is removed by using bismuth sulfate, and the property that hydrogen chloride is easy to volatilize is utilized again, so that the bismuth oxychloride is regenerated into bismuth sulfate; and finally, the property of the electrode potential of manganese is lower than the electrode potential of bismuth is utilized, so that residual bismuth in the purified liquid can be replaced and recycled. The method has the advantages of being short in process, good in product quality and low in cost.

Description

technical field [0001] The invention relates to a method for purifying manganese sulfate electrolyte, in particular to a hydrometallurgical method for purifying and removing chlorine in manganese sulfate solution. Background technique [0002] Manganese metal is a bright silver-white transition metal, hard and brittle, chemically active, and exists in the form of compounds. In the iron and steel industry, manganese is mainly used for desulfurization and deoxidation of steel, and is also used as an alloy additive to improve the strength, hardness, elastic limit, wear resistance and corrosion resistance of steel; in high alloy steel, it is also used as austenite It is a compound element for refining stainless steel, special alloy steel, stainless steel welding rod, etc. In addition, it is also used in non-ferrous metals, chemicals, medicine, electronics and agriculture. [0003] The main products of manganese are manganese metal and manganese dioxide. Their production proces...

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Application Information

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IPC IPC(8): C25C1/10C22B3/44C22B3/46
CPCC22B3/44C22B3/46C25C1/10
Inventor 刘伟锋杨天足张杜超陈霖唐攒浪孙百奇
Owner CENT SOUTH UNIV
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