Process for preparing tetrahydrate manganese chloride by leaching out rhodochrosite with waste acid

A technology of manganese chloride tetrahydrate and rhodochrosite, applied in manganese halide and other directions, can solve the problems of waste of recyclable resources, energy, unreasonable utilization of resources, etc., and achieve the effect of low production cost and good comprehensive benefit.

Inactive Publication Date: 2011-05-11
沈新财
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only pays for the non-compliance of emissions, but also greatly wa...

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  • Process for preparing tetrahydrate manganese chloride by leaching out rhodochrosite with waste acid
  • Process for preparing tetrahydrate manganese chloride by leaching out rhodochrosite with waste acid
  • Process for preparing tetrahydrate manganese chloride by leaching out rhodochrosite with waste acid

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Embodiment 1

[0159] Embodiment 1 of the present invention: get rhodochrosite (90% particle diameter is within 100 orders), add step by step waste hydrochloric acid (concentration is 22%~25%) reclaiming from sponge titanium chlorination production and leaching 3 times, the hydrochloric acid The excess coefficient is 1.3, colemanite is added as an oxidant at the same time, the liquid-solid ratio of the reaction system is 2.5:1, the leaching reaction temperature is 80°C, the reaction time is 60 minutes, and the stirring intensity is 90 rpm; the pH value of the reaction process is controlled at 0.5-1.0, MnO in manganese ore can be made 2 Play its oxidation function very well; at the end of the reaction, use CaO as a pH regulator to adjust the pH value to 4.0-5.0, which can make the Fe in the leachate 3+ Hydrolyzed to achieve the purpose of iron removal. After the reaction, the mixed solution generated was filtered, and the filter residue was leached with acid again, the reaction temperature w...

Embodiment 2

[0161] Embodiment 2 of the present invention: get rhodochrosite, add waste hydrochloric acid (concentration is 22%~25%) step by step to leach twice, the excess coefficient of hydrochloric acid is 1.3, add coromansite simultaneously as oxidant, the liquid-solid ratio of reaction system is 2.5 : 1, the leaching reaction temperature is 80°C, the reaction time is 60 minutes, and the stirring intensity is 90 rpm; the pH value of the reaction process is controlled at 0.5~1.0, which can make the MnO 2 Play its oxidation function very well; at the end of the reaction, use CaO as a pH regulator to adjust the pH value to 4.0-5.0, which can make the Fe in the leachate 3+ Hydrolyzed to achieve the purpose of iron removal. After the reaction, the mixed solution generated was filtered, and the filter residue was leached with acid again, the reaction temperature was 60°C, and the reaction time was 30 minutes; the filtrate was added with metal manganese powder and stirred and heated at 80°C f...

Embodiment 3

[0162] Embodiment 3 of the present invention: get rhodochrosite, add waste hydrochloric acid (concentration is 22%~25%) leaching, the excess coefficient of hydrochloric acid is 1.3, add pyrolusite simultaneously as oxidant, the liquid-solid ratio of reaction system is 2.5: 1, leaching The reaction temperature is 80°C, and the reaction time is 60 minutes; the pH value of the reaction process is controlled at 0.5-1.0, which can make the MnO in duromanganese 2 Play its oxidation function very well; at the end of the reaction, use CaO as a pH regulator to adjust the pH value to 4.0-5.0, which can make the Fe in the leachate 3+ Hydrolyzed to achieve the purpose of iron removal. After the reaction, the mixed solution generated was filtered, and the filter residue was leached with acid again, the reaction temperature was 60°C, and the reaction time was 30 minutes; the filtrate was added with metal manganese powder and stirred and heated at 80°C for 1 hour to form a heavy metal precip...

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Abstract

The invention discloses a process for preparing tetrahydrate manganese chloride by leaching out rhodochrosite with waste acid. The process comprises the following steps of: adding waste hydrochloric acid to rhodochrosite step by step for leaching, meanwhile, adding pyrolusite or psilomelane which is used as an oxidant; filtering the generated mixed solution, and leaching the filter residue with acid once again; adding metal manganese powder to filter liquor for precipitating, filtering and abandoning slag; adding oxalic acid in the filter liquor for settling, filtering; adding manganese sulfate powder to the filter liquor for precipitating, and filtering; quantitatively adding BaCl2 to the filter liquor, standing still and filtering to remove excessive SO4 <2->; and finally, carrying out concentrating crystallization and centrifugal separation on the filter liquor to obtain a tetrahydrate manganese chloride product. Compared with the prior art, the process has the advantages of simple process flow, convenience of operation, less investment, high efficiency and easy utilization of industrialization. In the invention, low-concentration waste acid is used for leaching the rhodochrosite to produce tetrahydrate manganese chloride, which not only solves the treatment problem of waste acid, but also efficiently utilizes a large quantity of low-grade rhodochrosite resources and realizes the sustainable utilization of resources.

Description

technical field [0001] The invention relates to a process for preparing manganese chloride tetrahydrate by leaching rhodochrosite with waste acid, which belongs to the technical field of recycling waste acid. Background technique [0002] A large amount of waste acid is produced in the production of sponge titanium and chlor-alkali industry. Taking the production of sponge titanium as an example, it needs to go through: titanium slag is smelted from titanium ore (titanium slag smelting process) → titanium slag reacts with chlorine gas to generate crude tetrachloride Titanium chloride (chlorination process) → refining crude titanium tetrachloride (refining process) → adding magnesium to reduce distillation reaction to generate sponge titanium (reduction distillation process) → packaging product sponge titanium and other processes. The titanium sponge production process itself is a relatively complete and complex "process chain", and the lack of any link in the middle may redu...

Claims

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Application Information

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IPC IPC(8): C01G45/06
Inventor 沈新财
Owner 沈新财
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