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Method for preparing manganese-iron alloy based on low-grade manganese ore

A low-grade manganese ore and ferromanganese alloy technology, applied in the field of metallurgy, can solve the problems of environmental pollution, high energy consumption, large investment, etc., and achieve the effect of simple and controllable method, high metal yield and high quality

Inactive Publication Date: 2014-08-20
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduction roasting is currently the most popular production process for processing high-grade manganese ore; its disadvantages are large investment, high energy consumption, and the emission of flue gas during the roasting process pollutes the environment
[0007] In summary, no matter wet leaching or reduction roasting-leaching process, there are obvious deficiencies in the treatment of low-grade manganese ore.

Method used

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  • Method for preparing manganese-iron alloy based on low-grade manganese ore
  • Method for preparing manganese-iron alloy based on low-grade manganese ore

Examples

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Effect test

Embodiment 1

[0030] A method for preparing ferromanganese alloy based on low-grade manganese ore, specifically comprising the following steps: taking manganese ore within the composition range of Table 1, the main components are: T.Mn 20.5%, SiO 2 18.7%, CaO 19.4%, T.Fe 5.3%; take the iron ore powder within the composition range of Table 2, the main components are: T.Fe 62.5%, SiO 2 1.5%, Al 2 o 3 1.3%. The above-mentioned low-grade manganese ore and iron ore powder (the mass ratio of the two is 2:1) are mixed, crushed, ball milled, and passed through a 180-mesh sieve to obtain the oversize and undersize. Weigh 5kg of undersieve, add 0.25kg of quicklime, 1.0kg of coal powder, 0.1kg of bentonite and 0.4kg of water to make pellets on a disc pelletizer. The diameter of the green pellets is 10mm. Dry the pellets in an oven at 105°C for 4 hours. Then put the dried pellets into a graphite crucible, reduce them at 1450°C for 15 minutes, cool with the furnace, use a jaw crusher to crush the ...

Embodiment 2

[0032] A method for preparing ferromanganese alloys based on low-grade manganese ore, specifically comprising the following steps: taking manganese ore within the composition range of Table 1, the main components are: T.Mn 24.6%, SiO 2 20.7%, CaO 20.1%, T.Fe 6.2%; take the iron ore powder within the composition range of Table 2, the main components are: T.Fe 63.2%, SiO 2 2.7%, Al 2 o 3 1.6%. The above-mentioned low-grade manganese ore and iron ore powder (the mass ratio of the two is 3:1) are mixed, crushed, ball milled, and passed through a 200-mesh sieve to obtain the oversize and undersize. Weigh 8kg of undersieve, add 0.4kg of quicklime, 2.4kg of coal powder, 0.2kg of bentonite and 0.7kg of water to make pellets on a disc pelletizer. The diameter of the green pellets is 16mm. Dry the pellets in an oven at 105°C for 4 hours. Then put the dried pellets into a graphite crucible, reduce at 1500°C for 10 minutes, cool with the furnace, crush the reduced pellets with a jaw...

Embodiment 3

[0034] A method for preparing ferromanganese alloy based on low-grade manganese ore, specifically comprising the following steps: taking manganese ore within the composition range of Table 1, the main components are: T.Mn 28.2%, SiO 2 19.2%, CaO 18.6%, T.Fe 7.1%; take the iron ore powder within the composition range of Table 2, the main components are: T.Fe 64.1%, SiO 2 2.4%, Al 2 o 3 1.8%. The above-mentioned low-grade manganese ore and iron ore powder (the mass ratio of the two is 4:1) are mixed, crushed, ball milled, and passed through a 250-mesh sieve to obtain the oversize and undersize. Weigh 10kg of the undersieve, add 0.6kg of quicklime, 2.5kg of coal powder, 0.3kg of bentonite and 0.8kg of water to make pellets on a disc pelletizer. The diameter of the green pellets is 10mm. Dry the pellets in an oven at 105°C for 4 hours. Then put the dried pellets into a graphite crucible, reduce them at 1500°C for 10 minutes, cool with the furnace, crush the reduced pellets w...

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Abstract

The invention discloses a method for preparing a manganese-iron alloy based on low-grade manganese ore. The method comprises four processes, namely ball milling of raw materials, pelletizing, quick reduction and slag-metal separation. The method comprises the following steps: mixing low-grade manganese ore and iron ore powder; milling the mixed ore, and screening with a 150-300 meshes screen; mixing the screen underflow with the pulverized coal, lime, bentonite and water, and pelletizing on a disc type pelletizer, wherein the diameter of the green balls is 10-16mm; drying the green balls at 105 DEG C for 4h; reducing the dried pellets at 1,450-1,550 DEG C for 8-15min; and after the reaction, crushing the raw material, and performing simple magnetic separation to obtain granular manganese iron, wherein the manganese content is 45-70%, the iron content is 25-45%, the carbon content is 2-5%, and the balance is impurities. According to the method disclosed by the invention, the manganese-iron alloy is prepared by the one-step process of the quick reducing technology, the slag and metal are easily separated, the process is pollution-free, the manganese recovery rate is high, and high value-added utilization of the low-grade manganese ore is realized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing ferromanganese alloy based on low-grade manganese ore. Background technique [0002] Our country is rich in mineral resource reserves, but there are very few rich ores, and there are many lean ores and polymetallic symbiotic ores, which bring major problems to the dressing and smelting technology. At the same time, my country is also a big country of iron and steel, and its steel output has ranked first in the world for many years in a row. The demand for iron ore and ferroalloys is huge. Due to the current situation of resources in our country, we have to import a large number of foreign high-quality ores every year to meet the huge domestic market demand, which greatly restricts the healthy development of the iron and steel industry. [0003] Ferromanganese is one of the most commonly used ferroalloys in the field of steelmaking, and manga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B1/24
Inventor 王德永王慧华陈栋洪澜
Owner SUZHOU UNIV
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