Method for preparing manganous nitrate solution

A technology of manganese nitrate and nitric acid, applied in the direction of manganese nitrate, etc., can solve the problems of resource waste and low leaching rate of target metal manganese, and achieve the effects of reducing burden, speed and improving leaching rate

Inactive Publication Date: 2015-07-15
SICHUAN NORMAL UNIV
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AI Technical Summary

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

[0015] Embodiment 1: 100g pyrolusite powder (containing manganese 55.5%, Fe 2 o 3 6.7%, particle size 180 mesh) and elephant grass powder (1.5mm) 88g were added to a stainless steel pressure reactor with a volume of 10L, and the concentration was 30g / L, Mn(NO 3 ) 2 4300ml of 400g / L mixed solution was leached for 2h at 40℃~50℃ under airtight stirring (stirring speed 70r / min). According to the laboratory analysis results of the washed leaching slag, the leaching rate of manganese is 99.4%.

Embodiment 2

[0016] Embodiment 2: 1000g pyrolusite powder (containing manganese 55.5%, Fe 2 o 3 6.7%, particle size 180 mesh) and elephant grass powder (1.5mm) 1005g into a stainless steel pressure reactor with a volume of 50L, the concentration of adding is 50g / L, Mn(NO 3 ) 2 26L of 150g / 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 99.6%.

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PUM

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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 and napier grass powder 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 invention relates to a method for preparing manganese nitrate solution by utilizing pyrolusite. Background technique [0002] Manganese nitrate is the raw material for the preparation of chemical manganese dioxide. The preparation of manganese nitrate solution is the main way to obtain manganese nitrate. 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%. As a result, when using pyrolusite to prepare manganese nitrate solution, the leaching rate of the target metal manganese is not high, resulting in waste of resources. The method of directly preparing manganese nitrate solution from pyrolusite with high leaching rate and fast leaching speed has great practical value. Contents of the invention [0003] For the problem of utilizing pyrolusite to prepare manganese nitrate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/08
Inventor 龙炳清陈俊万旭
Owner SICHUAN NORMAL UNIV
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