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Method for preparing manganous nitrate solution

A technology of manganese nitrate and nitric acid, applied in directions such as manganese nitrate, can solve problems such as low leaching rate of target metal manganese, waste of resources, etc., achieve obvious economic and environmental benefits, reduce burden, and have the effects of small excess nitric acid

Inactive Publication Date: 2014-04-30
SICHUAN NORMAL UNIVERSITY
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Problems solved by technology

The preparation of manganese nitrate solution from pyrolusite requires the reduction and roasting of MnO 2 It can be leached with nitric acid only after conversion to MnO, but the conversion rate of roasting is only about 85%, so that when using pyrolusite to prepare manganese nitrate solution, the leaching rate of the target metal manganese is not high, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: 100g pyrolusite powder (containing manganese 55.5%, Fe 2 o 3 6.7%, particle size 180 mesh) and 326mL winemaking wastewater (including COD Cr 50000mg / L) into a stainless steel pressure reactor with a volume of 10L, and the concentration of adding 33g / L, Mn(NO 3 ) 2 4000ml of 400g / L mixed solution, leaching for 2h at 40℃~50℃ with airtight stirring (stirring speed 70r / min). According to the test and analysis results of the leached slag after washing, the leaching rate of manganese is 99.5%.

Embodiment 2

[0015] Embodiment 2: 1000g pyrolusite powder (containing manganese 55.5%, Fe 2 o 3 6.7%, particle size 180 mesh) and 2L starch production concentrated wastewater (including COD Cr 90000mg / L) into a stainless steel pressure reactor with a volume of 50L, and the concentration of adding 52g / L, Mn(NO 3 ) 2 26L of 165g / L mixed solution was leached for 1h at 50℃~60℃ under closed stirring (stirring speed 60r / min). According to the test and analysis results of the leached slag after washing, the leaching rate of manganese is 99.8%.

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Abstract

The invention discloses a method for preparing a manganous nitrate solution. The method comprises the steps of adding pyrolusite powder with the particle size being not greater than 180 meshes and high-concentration organic wastewater which does not contain benzene-ring substances into a reaction kettle which is resistant to pressure and the corrosion of nitric acid, adding a mixed solution prepared from nitric acid and manganous nitrate, and leaching while stirring under closed conditions.

Description

Technical field [0001] The present invention involves a method of preparing manganese nitrate solution with soft manganese ore. Background technique [0002] Manganese nitrate is a raw material for preparing manganese dioxide.Preparation of manganese nitrate solution is the main way to obtain manganese nitrate.Use soft manganese mineral preparation to prepare manganese nitrate solution to reducing roasting to mno 2 Only MNO can be immersed out with nitric acid, but the conversion rate of roasting is only about 85%. As a result, the target metal manganese immersion rate is not high when using a soft manganese ore nitrate solution, causing waste of resources.The method of developing a soft manganese ore with high immersion rate and fast -leaching speed has great practical value. Invention content [0003] In response to the problem of preparing manganese nitrate solution for soft manganese ore, the purpose of the present invention is to find a method of direct preparation of manga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/08
Inventor 龙炳清方绪坤周讯
Owner SICHUAN NORMAL UNIVERSITY
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