Manganese ore products include metallurgical manganese ore, manganese carbonate ore powder, chemical manganese dioxide ore powder and battery manganese dioxide ore powder. How much do you know about manganese ore? The following is the content of manganese ore knowledge organized by me. I hope you like it!
Economic indicators of manganese ore
Manganese ore products include metallurgical manganese ore, manganese carbonate ore powder, chemical manganese dioxide ore powder and battery manganese dioxide ore powder. Metallurgical departments, light industry departments and chemical industry departments using manganese ore products have different quality requirements for manganese ore products according to different uses. （1） Quality requirements for manganese ore in metallurgical industry
The iron content of iron ores used for steelmaking pig iron, manganese bearing pig iron and specularite is unlimited, and the total content of manganese and iron in the ores should reach 40%~50%.
In smelting various grades of manganese alloys, there are certain requirements for the manganese content of ore and the ratio of manganese to iron. Smelting medium and low carbon ferromanganese, manganese content of ore is 36%~40%, manganese iron ratio is 6~8, 5, phosphorus manganese ratio is 0, 002~0, 0036; Smelting carbon ferromanganese, manganese content of ore is 33%~40%, manganese iron ratio is 3, 8~7, 8, phosphorus manganese ratio is 0, 002~0, 005; Smelting manganese silicon alloy, manganese content of ore is 29%~35%, manganese iron ratio is 3, 3~7, 5, phosphorus manganese ratio is 0, 0016~0, 0048; Blast furnace ferromanganese, ore manganese content 30%, ferromanganese ratio 2-7, phosphorus manganese ratio 0, 005.
（2） Quality Requirements for Manganese Ore by Chemical and Light Industry Departments
In the chemical industry, manganese ore is mainly used to produce manganese dioxide, manganese sulfate and potassium permanganate, and then manganese carbonate, manganese nitrate and manganese chloride. Chemical grade manganese dioxide ore powder requires that the content of MnO2 is greater than 50% (Table 3, 3, 3). When preparing manganese sulfate, Fe ≤ 3%, Al2O3 ≤ 3%, CaO ≤ 0, 5%, MgO ≤ 0, 1%; When preparing potassium permanganate, Fe ≤ 5%, SiO2 ≤ 5%, Al2O3 ≤ 4%.
Natural manganese dioxide is the raw material for manufacturing dry batteries. The higher the content of MnO2, the better. The general factory standard for Ni, Cu, CO, Pb and other harmful elements is: Cu<0, 01%, Ni<0, 03%, Co<0, 02%, Pb<0, 02%. The particle size of mineral powder shall be less than 0 and 12 mm.
Effect of manganese on human body
physiological function
1. It can promote the growth and development of bones.
2. Protect the integrity of the fine particles in the cell.
3. Maintain normal brain function.
4. Maintain normal glucose and fat metabolism.
5. It can improve the hematopoietic function of the body.
Surplus, deficiency and health
Manganese deficiency symptoms can affect reproductive capacity, and may cause congenital malformations, abnormal formation of bone and cartilage, and impaired glucose tolerance in offspring. In addition, the lack of manganese can cause neurasthenic syndrome and affect intellectual development. Manganese deficiency will also lead to the reduction of insulin synthesis and secretion, affecting glucose metabolism.
Manganese ore dressing method
The vast majority of manganese ores in China belong to lean ores, which must be beneficiated. However, because most manganese ores are fine or embedded with fine particles, and there are a considerable number of high phosphate ores, high iron ores and co (concomitant) beneficial metals, it is very difficult to beneficiate. The commonly used manganese ore dressing methods in China are mechanical separation (including ore washing, screening, gravity separation, strong magnetic separation and flotation), fire enrichment, chemical beneficiation, etc.
1. Ore washing and screening
Ore washing is to separate ore from mud by hydraulic flushing or additional mechanical scrubbing. Common equipment includes ore washing screen, drum ore washing machine and trough ore washing machine.
The ore washing operation is often accompanied by screening, such as washing directly on the vibrating screen or sending the ore sand (clean ore) obtained by the ore washing machine to the vibrating screen for screening. Screening can be used as an independent operation to separate products with different particle sizes and grades for different purposes.
2. Reselect
Gravity concentration is only used to separate manganese ores with simple structure and coarse embedded particle size, especially for manganese oxide ores with large density. Common methods include heavy medium beneficiation, jigging beneficiation and shaking table beneficiation.
At present, the process flow of treating oxidized manganese ore in China is generally to break the ore to 6~0mm or 10~0mm, then group it, jigging the coarse grade ore and shaking the fine grade ore. The equipment is mostly Haze reciprocating jig and 6-S shaking table. [2]
3. High intensity magnetic separation
Manganese mineral belongs to weakly magnetic mineral [specific magnetization X=10 × 10-6～600 × 10-6cm3/g] can be recovered in the high magnetic field separator with the magnetic field strength Ho=800 ～ 1600kA/m (10000 ～ 20000oe), and the manganese grade can generally be improved by 4% ～ 10%.
Because of the simple operation, easy control and strong adaptability of magnetic separation, it can be used for the separation of various manganese ores, and manganese ore dressing plays a leading role. Various new types of coarse, medium and fine grain strong magnetic machines have been successfully developed. Medium sized and fine sized high intensity magnetic separators are widely used in manganese ores in China, and the coarse and fine sized high intensity magnetic separators are also gradually applied, while the fine sized high intensity magnetic separators are still in the experimental stage.
4. Gravity magnetic separation
At present, the newly built and reconstructed heavy magnetic separation plants in China include manganese ores in Liancheng, Fujian, Longtou, Jingxi and Xialei in Guangxi. For example, Liancheng Manganese Mine Heavy Magnetic Separation Plant mainly deals with leached manganese oxide ores. The AM-30 jig is used to treat 30~3mm washed ores, which can obtain high-quality manganese concentrate containing more than 40% manganese. After manual separation and impurity removal, it can be used as the raw material of battery manganese powder. After jigging tailings and washed ore less than 3mm are milled to less than 1m, the manganese concentrate grade will be increased by 24%~25% to 36%~40% by using high intensity magnetic separator.
5. Strong magnetic flotation
Only Zunyi manganese ore is used with strong magnetic flotation process. The ore is low manganese, low phosphorus and high iron manganese ore mainly composed of manganese carbonate.
According to the industrial test, the grinding process adopts rod mill ball mill stage grinding, and the equipment scale is φ 2100mm × 3000mm wet mill. The shp-2000 type high intensity magnetic separator is used for high intensity magnetic separation, and the CHF type inflatable flotation machine is mainly used for flotation machine. After years of production tests, it has good performance and is very suitable for Zunyi manganese ore dressing application. The successful test of strong magnetic flotation process flow and its application in production indicate that the deep separation of manganese ore in China has made a big step forward.
6. Pyrogenic enrichment
Enrichment of manganese ore by fire is a separation method for treating refractory and poor manganese ore with high phosphorus and high iron, which is generally called rich manganese slag method. Its essence is a high temperature separation method of selectively separating manganese, phosphorus and iron by controlling their temperature in blast furnace or electric furnace based on different reduction temperatures of manganese, phosphorus and iron.
Pyro enrichment has been used for nearly 40 years in China. In 1959, Zijiang Iron Works in Shaoyang, Hunan, conducted tests on 9 and 4 m3 small blast furnaces, and obtained preliminary results. Subsequently, in 1962, Shanghai Ferroalloy Plant and Shijingshan Iron and Steel Plant smelted manganese rich slag in blast furnace respectively. In 1975, the blast furnace of Manaoshan Manganese Mine in Hunan not only smelted manganese rich slag, but also recovered lead, silver and pig iron (commonly known as semi steel) from the bottom of the furnace, providing a basis for comprehensive utilization. Since the 1980s, the production of manganese rich slag has developed rapidly, and it has developed in Hunan, Hubei, Guangdong, Guangxi, Jiangxi, Liaoning, Jilin and other places.
The pyrometallurgical enrichment process is simple and the production is stable. It can effectively separate iron and phosphorus from the ore to obtain manganese rich, low iron and low phosphorus manganese rich slag. This manganese rich slag generally contains 35%~45% Mn, 12~38 Mn/Fe, P/Mn<0, 002. It is a high-quality manganese alloy raw material, and it is also an artificial rich ore that is difficult for ordinary natural manganese rich ores to achieve the above three indicators at the same time. Therefore, pyrometallurgical enrichment is a promising beneficiation method for high phosphorus, high iron and low manganese refractory ores in China.
