Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for direct production of ultra-pure manganese sulfate by non-carbon reduction of manganese dioxide

A technology of manganese dioxide and manganese sulfate, applied in the direction of manganese sulfate, etc., can solve problems such as high production costs, environmental pollution, and indicators that cannot meet the requirements, and achieve the effect of saving concentration costs

Active Publication Date: 2015-07-15
邵阳市金湘科技有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although said method can produce high-purity manganese sulfate product with high-quality feed grade manganese sulfate, there are many problems and deficiencies
First, there are strict requirements on raw materials, and the indicators of most feed-grade manganese sulfate products in China cannot meet the requirements, and the production cost is relatively high
Second, use toxic fluoride to remove calcium and magnesium, which will cause environmental pollution
Third, there are difficulties in filtering during the production process
At present, there is no company in the world that directly produces high-purity manganese sulfate products from raw ore. If direct production can be realized, it will not only reduce energy consumption, improve resource utilization and reduce production costs, but also expand production capacity and provide a large amount of cheap and high-quality products for the new energy industry. High Purity Manganese Sulfate Products

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0012] The specific embodiment of the present invention is: a kind of method of directly producing ultra-high-purity manganese sulfate by carbon-free reduction of manganese dioxide, 1. at first manganese dioxide powder and pyrite powder are washed with dilute sulfuric acid in a stirring tank to the fullest calcium, Magnesium impurities are then filtered and washed respectively; ②The washed manganese dioxide powder and pyrite powder are put into another stirring tank for water washing according to the ratio of Mn:S of 1:0.4, and then press-filtered until dry; ③The press-filtered The mixed powder is dried and roasted; ④The roasted product is leached in a non-open container with dilute sulfuric acid, and then the pH of the leaching solution is adjusted to 6 with hydrogen peroxide; Pure manganese sulfate solution can be obtained; ⑥ evaporate and crystallize the obtained pure manganese sulfate solution to obtain pure manganese sulfate crystals, concentrate the mother liquor to prepa...

example 1

[0020] Wash and dry 1000g containing MnO 2 Mix 45% manganese powder, 200g pyrite powder containing 45% S and a small amount of catalyst evenly, then put it into a metal container with a cover, and then put the container into a high-temperature furnace at 450°C and keep it warm for 30 minutes. Then take it out and cool it, get 300g calcined sand and 500ml distilled water and put them into a three-neck flask with stirring, introduce a small amount of gas generated by the reaction into the lye from one mouth with a small tube, and add 75ml of concentrated sulfuric acid dropwise from the other mouth with a separatory funnel, After reacting for 90 minutes, adjust the pH to 6 with hydrogen peroxide, and filter after standing for 3 hours. After standing for 24 hours, filter the filtrate again with slow filter paper. The fine filtrate was tested, and the harmful impurities:

[0021] K=300μg / ml, Na=30μg / ml, Ca=225μg / ml, Mg=265μg / ml, Zn=30μg / ml, Pb=2μg / ml, Cd=4μg / ml, Cu<2μg / ml, As< 1μg...

example 2

[0026] 1000g of pickled and dried MnO-containing 2 Add 35% manganese powder, 150g pyrite powder containing 41% S, and 20g combustion accelerant into a special heating furnace with stirring at the same time, react at 500°C for 60 minutes and cool down to detect that the calcine has not reduced MnO 2 6%, take 500 grams of calcined sand and leaching with 10% dilute sulfuric acid under ventilated conditions, control the pH value of the reaction end point to 4.5, then neutralize with hydrogen peroxide to pH = 6, filter after standing for 3 hours, and filter the filtrate after standing for 24 hours Filter again with slow filter paper, the fine filtrate is tested, harmful impurities:

[0027] K=345μg / ml, Na=42μg / ml, Ca=305μg / ml, Mg=345μg / ml, Zn=35μg / ml, Pb=1.5μg / ml, Cd=3μg / ml, Cu<2μg / ml, As <1μg / ml,

[0028] Concentrate and recrystallize to obtain qualified high-purity manganese sulfate.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for direct production of ultra-pure manganese sulfate by non-carbon reduction of manganese dioxide; the method comprises: first washing manganese dioxide powder and pyrite powder in a stirring pool respectively with dilute sulfuric acid to wash away calcium and magnesium impurities, and then respectively filtering and washing; putting the washed manganese dioxide powder and pyrite powder into another stirring pool in a ratio of Mn:S of 1:0.4 for water washing, and then pressing to dry by filter pressing; drying and roasting mixed powder of the filter pressing; leaching a roasted product with the dilute sulfuric acid in a non-open container, then using hydrogen peroxide to regulate the pH of a leaching solution to 6; filtering the leaching solution to obtain a manganese sulfate melt, then obtaining a pure manganese sulfate solution by standing and refining; and obtaining pure manganese sulfate crystals by evaporation and crystallization of the obtained pure manganese sulfate solution, and obtaining feed grade manganese sulfate by concentration of a mother liquor. The method is reasonable in process and low in production cost; and compared with the processes in the prior art, no toxic raw materials is needed, and the method is environmentally friendly and energy saving.

Description

technical field [0001] The invention relates to a method for directly producing ultra-high-purity manganese sulfate by reducing manganese dioxide without carbon. Background technique [0002] High-purity manganese sulfate is the main raw material for preparing high-purity manganese dioxide, high-purity manganese tetraoxide, lithium manganate, ternary positive electrode, high-purity manganese carbonate and other products. Now high-purity manganese sulfate is produced by dissolving feed-grade manganese sulfate, adding fluoride to remove calcium and magnesium, and then recrystallizing after purification by extraction or other methods. Although said method can produce high-purity manganese sulfate product with high-quality feed grade manganese sulfate, there are many problems and deficiencies. First, there are strict requirements on raw materials, and the indicators of most feed-grade manganese sulfate products in China cannot meet the requirements, and the production cost is r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/10
Inventor 何建桥张海东
Owner 邵阳市金湘科技有限公司