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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., and achieve the effects of fast speed, lightening burden, and low energy consumption

Inactive Publication Date: 2015-04-15
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 55.5% manganese, Fe 2 O 3 6.7%, particle size 180 mesh) and grain bran (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, leached for 2h at 40℃~50℃ with closed stirring (stirring speed 70r / min). According to the laboratory analysis results of the washed leaching residue, the leaching rate of manganese was 99.1%.

Embodiment 2

[0016] Embodiment 2: 1000g pyrolusite powder (containing 55.5% manganese, Fe 2 O 3 6.7%, particle size 180 mesh) and grain bran (1.5mm) 1005g were added to a stainless steel pressure reaction kettle with a volume of 50L, and the concentration was 50g / L, Mn (NO 3 ) 2 26L of 150g / L mixed solution, leached for 1h at 50℃~60℃ with closed stirring (stirring speed 60r / min). According to the laboratory analysis results of the washed leaching residue, the leaching rate of manganese was 99.4%.

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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 rice bran 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 Patents(China)
IPC IPC(8): C01G45/08
Inventor 龙炳清陈建文邓国海
Owner SICHUAN NORMAL UNIV
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