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Method for preparing manganese sulfate by biomass self-heating reduction of low grade manganese oxide ore

A technology of manganese oxide ore and biomass raw materials, applied in the direction of manganese sulfate, energy input, etc., can solve the problems that manganese sulfate solution cannot be produced by electrolytic manganese, and the manganese leaching rate is low, so as to reduce production costs and save energy.

Inactive Publication Date: 2009-05-27
李学军 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the leaching rate of manganese in this invention is low, being 93%. Industrial practice has found that the manganese sulfate solution obtained by this method cannot be used for electrolytic manganese production.

Method used

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  • Method for preparing manganese sulfate by biomass self-heating reduction of low grade manganese oxide ore
  • Method for preparing manganese sulfate by biomass self-heating reduction of low grade manganese oxide ore
  • Method for preparing manganese sulfate by biomass self-heating reduction of low grade manganese oxide ore

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Get Tiandeng manganese oxide ore powder 800Kg and grind to 10 mesh rice straw 200Kg and mix, then with 10Kg initiation additive (firewood coal (containing C content is 60% w / w, pulverized to 80 mesh): pyrite (containing S content is 42% w / w, crushed to 80 mesh): potassium nitrate: potassium phosphate = 20: 10: 5: 1) mix evenly, put the uniformly mixed material in the reaction furnace, roast at 600°C for 1h, and roast well The material is cooled to below 80°C, and the obtained calcined sand is leached at 60°C for 60 minutes with dilute sulfuric acid (acid-mineral ratio: 0.55) with a concentration of 98 g / L (1mol / L), and the pH of the mixture is adjusted to 6.0 with ammonia water. , filtered, and a small amount of water to wash the filter residue, and the manganese leaching rate was calculated to be 95.3%. The obtained filtrate can meet the requirements for the production of electrolytic manganese, manganese dioxide, trimanganese tetraoxide and other products after remova...

Embodiment 2

[0034]Get 600Kg of Laibin manganese oxide ore powder and mix it with 60Kg of wheat straw crushed to 10 mesh, and then mix it with 6Kg of initiation additive (coal gangue (with C content of 25% w / w, S content of 2% w / w, crushed to 80 mesh) : Sodium nitrate: Sodium phosphate=50:5:0.5) Mix evenly, put the uniformly mixed material in the reaction furnace, roast at 400°C for 3 hours, cool the roasted material to below 80°C, the obtained calcined sand has a concentration of Dilute sulfuric acid (acid-mineral ratio: 0.55) of 98 g / L (1mol / L) at 40°C for 120 min, adjust the pH of the mixture to 2.5 with sodium hydroxide, filter, wash the filter residue with a small amount of water, and calculate manganese The leaching rate is 98.3%. The obtained filtrate was precipitated with MnS and cobalt-nickel in an amount of 1.1 times the molar content of cobalt-nickel in the solution, and filtered to obtain a filter cake, which was dried to obtain a cobalt-nickel enrichment with a cobalt content ...

Embodiment 3

[0036] Get Gongcheng manganese oxide ore powder 1000Kg and grind to 20 mesh sawdust 100Kg and crush to 20 mesh bagasse 100Kg and mix, then with 8Kg initiator additive (brignite (containing C content is 70% w / w, crushed to 100 mesh): sulfuric acid Ferrous: Potassium nitrate: Phosphorus; Potassium acid = 50:1:1:0.5) Mix evenly, put the evenly mixed material in the reaction furnace, roast at 500°C for 0.5h, and cool the roasted material to 60°C Next, the obtained calcined sand is leached at 80°C for 30 minutes with dilute sulfuric acid (acid-mine ratio: 0.55) with a concentration of 40 g / L, and the pH of the mixed solution is adjusted to 3 with ammonia water, filtered, and the filter residue is washed with a small amount of water to calculate manganese The leaching rate is 96.3%. The leach slag adopts magnetic separation to recover iron, and the finally obtained slag can be used as raw material for cement production. The obtained filtrate is precipitated with MnS and the cobalt-...

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Abstract

The invention discloses a method for preparing manganese sulfate through the biomass self heating reduction of low-grade manganese oxide ore. The method comprises the following steps: 1) respectively crushing the low-grade manganese oxide ore and biomass material; 2) weighing the low-grade manganese oxide ore, the biomass material and an initiating additive according to the weight ratio of 100:10-30: 0.5-3; 3) mixing evenly and roasting the low-grade manganese oxide ore, the biomass material and the initiating additive; 4) leaching the roasted mass through dilute sulfuric acid at a temperature of between 40 and 80 DEG C, regulating the mixed liquor to make the pH value more than or equal to 6, carrying out solid-liquid separation, and keeping the obtained filtrate for standby; and 5) removing impurities from the filtrate to obtain the manganese sulfate solution. The method adopts renewable energy source of the biomass material to replace coal to reduce the manganese oxide ore and prepare manganese sulfate which can be the raw material for producing electrolytic manganese. The leaching efficiency of manganese can reach more than 95 percent. The method not only saves energy sources, but also reduces the production cost.

Description

(1) Technical field: [0001] The invention relates to a method for preparing manganese sulfate from manganese oxide ore, in particular to a method for preparing manganese sulfate by autothermally reducing low-grade manganese oxide ore with biomass. (two) background technology: [0002] Manganese sulfate is the main raw material for the preparation of manganese dioxide, trimanganese tetraoxide and electrolytic manganese. In the electrolytic manganese industry, the manganese sulfate solution used is mainly prepared from the following two types of raw materials. One is manganese carbonate ore. The raw material is leached directly with sulfuric acid solution; the other is manganese oxide ore as raw material, which is mixed with carbonaceous reducing agent, reduced at high temperature, and then leached with dilute sulfuric acid solution. At present, electrolytic manganese production enterprises mainly use manganese carbonate ore as raw material for production, but the manganese ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/10
CPCY02P20/133
Inventor 朱国才李赋屏李学军龚奇杰
Owner 李学军
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