Method for preparing manganous carbonate by using waste slag and waste water containing manganese as raw materials

A technology of manganese waste residue and manganese carbonate, applied in chemical instruments and methods, manganese compounds, inorganic chemistry, etc., can solve the problems of polluting the environment, wasting mineral resources, etc., achieving high recovery rate, low cost, and reducing emissions and environmental pollution. Effect

Inactive Publication Date: 2009-11-25
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If these manganese-containing waste residues and wastewater are discharged directly without treatm

Method used

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Examples

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Effect test

Embodiment 1

[0025] Put the manganese-containing waste residue (about 50 grams) and waste water (about 1000 grams) of anisaldehyde prepared by manganese dioxide oxidation into the reactor, heat, slowly add 24 grams of oxalic acid under stirring, react at 80 ° C for 30 minutes, filter . Add 5 grams of 30% hydrogen peroxide solution to the filtrate, heat it, and add 115 grams of 25 percent ammonia solution at the same time, adjust the pH to 5.5, react at 40° C. for 30 minutes, and filter. The filtrate was heated to 60°C, and 5 g of ammonium sulfide solution with a mass fraction of 5% was added to adjust the pH ≈ 6.0, reacted at 60°C for 2 hours, and filtered. Add 34 grams of ammonium sulfate solids to the filtrate, heat and dissolve, then concentrate and crystallize to obtain 350 grams of ammonium manganese sulfate crystals. The recovery rate of divalent manganese is 79.5%.

Embodiment 2

[0027] Put manganese-containing waste residue (about 50 grams) and waste water (about 1000 grams) of anisaldehyde prepared by oxidation of manganese dioxide into the reactor, heat, slowly add 32 grams of oxalic acid under stirring, react at 75 ° C for 30 minutes, filter . Add 10 grams of 30% hydrogen peroxide solution to the filtrate, heat it, and add 125 grams of 25 percent ammonia solution at the same time, adjust the pH to 6.0, react at 50° C. for 30 minutes, and filter. The filtrate was heated to 60°C, and 4 grams of ammonium sulfide solution with a mass fraction of 5% was added to adjust the pH to 6.5, reacted at 65°C for 2 hours, and filtered. Add 60 grams of ammonium sulfate solids in the filtrate, heat and dissolve, then concentrate and crystallize to obtain 343 grams of ammonium manganese sulfate crystals. The recovery rate of divalent manganese is 77.9%.

Embodiment 3

[0029] Put the manganese-containing waste residue (about 50 grams) and waste water (about 1000 grams) of anisaldehyde prepared by manganese dioxide oxidation into the reactor, heat, slowly add 20 grams of oxalic acid under stirring, react at 90 ° C for 15 minutes, filter . Add 5 g of 30% hydrogen peroxide solution to the filtrate, heat it, and add 116 g of 25% ammonia solution at the same time, adjust the pH to 5.5, react at 40° C. for 30 minutes, and filter. The filtrate was heated to 60°C, and 5 g of ammonium sulfide solution with a mass fraction of 5% was added to adjust the pH ≈ 6.0, reacted at 60°C for 2 hours, and filtered. Add 34 grams of ammonium sulfate solids to the filtrate, heat and dissolve, then concentrate and crystallize to obtain 340 grams of ammonium manganese sulfate crystals. The recovery rate of divalent manganese is 77.2%.

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Abstract

The invention discloses a method for preparing manganous carbonate by using waste slag and waste water containing manganese as raw materials, which is carried out as follows: reducing manganese dioxide by oxalic acid; oxidizing the ferrous iron therein into ferric iron by peroxide to form hydroxid deposit; neutralizing sulphuric acid therein by ammonia; depositing and removing heavy metal ions by ammonium sulfide; condensing to obtain ammonium manganous sulfate crystallization; reacting the ammonium manganous sulphate with ammonium hydrogen carbonate to prepare the manganous carbonate and obtain ammonium sulphate; the invention makes full use of reaction waste material and transforms water materials into useful elements; meanwhile, the invention can reduce emission and environmental pollution, which provides an efficient method for disposing waste slag and waste water containing manganese.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing manganese carbonate by using manganese-containing waste residue and waste water as raw materials. Background technique [0002] In the production process of anisaldehyde, using natural manganese dioxide (pyrolulurite) as an oxidant, a large amount of manganese-containing waste residue and waste water are usually produced, wherein the manganese-containing waste residue contains 20-40% manganese dioxide by quality, and the manganese-containing waste water contains About 10% by mass of sulfuric acid and 50-60g / L of divalent manganese. It is estimated that a factory with an annual output of 100 tons of anisaldehyde contains as much as 160 tons of manganese in the waste residue and wastewater produced each year. If these manganese-containing waste residues and wastewater are discharged directly without treatment, it will not only greatly waste precious mineral ...

Claims

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Application Information

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IPC IPC(8): C01G45/00
Inventor 邹永何树杰黄桐堃刘现可杨少凡刘新伟
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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