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Method for preparing molybdenum nickel alloy by directly reducing and smelting molybdenum nickel ore

A molybdenum-nickel ore and molybdenum-nickel technology, which is applied in the field of molybdenum-nickel ore direct reduction smelting molybdenum-nickel alloy, can solve the problems of reducing the comprehensive utilization rate of molybdenum-nickel ore, high content of harmful elements phosphorus and sulfur, and poor quality of crude molybdenum-nickel alloy , to achieve the effects of improving comprehensive utilization rate, high direct recovery rate and high sulfur fixation rate

Inactive Publication Date: 2012-07-18
CENT SOUTH UNIV +2
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AI Technical Summary

Problems solved by technology

[0005] 2. Molybdenum-nickel ore is oxidized and roasted, and the carbon in the raw material is burned. When sintering the sintered material, a carbonaceous reducing agent must be added again, which not only increases the operating cost, but also reduces the comprehensive utilization rate of the molybdenum-nickel ore.
[0006] 3. Molybdenum nickel ore is a sulfide mineral containing carbon. The thermal effect of oxidation and roasting is very large. The combustion of carbon and sulfur will release a lot of heat. If the method of burning on the ground is used, the roasting temperature cannot be controlled at all, which will cause the volatilization loss of molybdenum. The volatilization loss of molybdenum in this roasting method is as high as 4-5%.
[0007] 6. The quality of the obtained crude molybdenum-nickel alloy is poor, and the content of harmful elements phosphorus and sulfur is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take Mo 4.1%, Ni 2.94%, Zn 2.23%, V 0.619%, Fe 13.29%, C 10.23%, SiO 2 20.74%, Al 2 o 3 2.13%, CaO 6.49%, MgO 2.25%, S 19.21%, P 0.28% molybdenum-nickel ore direct reduction smelting crude molybdenum-nickel alloy, the implementation process is: directly crush molybdenum-nickel ore to an average particle size of less than 0.18mm. Add slagging agent quicklime powder (CaO content is 92.3%) and sodium carbonate (Na 2 CO 3 98.8%), its batching ratio is molybdenum-nickel ore powder: quicklime powder: sodium carbonate=100:25.5:10 (weight ratio), (CaO+Na 2 CO 3 ) / (SiO 2 +S) = 1.002. Slagging agent CaO:Na 2 CO 3 = 3:1. Because the carbon content of the molybdenum-nickel ore that is used for batching is 10.23%, does not reach the content of 11%, therefore adds coke powder (fixed carbon content is greater than 80%) by 1% of nickel-molybdenum ore weight in the above batching, then above-mentioned Add fluorite powder (CaF 2 87.6%). The average particle size of the abov...

Embodiment 2

[0038] Take Mo 5.8%, Ni 4.6%, Zn 2.1%, V 0.52%, Fe 10.3%, C 12.3%, SiO 2 22.8%, Al 2 o 3 2.3%, CaO 7.6%, MgO 2.0%, S 21.2%, P 0.35% molybdenum-nickel ore direct reduction smelting crude molybdenum-nickel alloy, the implementation process is: directly crush molybdenum-nickel ore to an average particle size of less than 0.18mm. Add slagging agent quicklime powder (CaO content is 92.3%) and sodium carbonate (Na 2 CO 3 98.8%), its batching ratio is molybdenum-nickel ore powder: quicklime powder: sodium carbonate=100:0:41 (weight ratio), (CaO+Na 2 CO 3 ) / (SiO 2 +S) = 1.1. According to the above batching method, add several materials with accurate weighing into the mixer and mix them well. The materials are pressed into Φ22-30mm pellets with a high-pressure double-roller briquetting machine, and the moisture content of the pellets is ≤1.5% after drying.

[0039] The reduction smelting operation is carried out in a reduction electric furnace equipped with a bag filter, and ...

Embodiment 3

[0043] Take Mo 3.0%, Ni 2.1%, Zn 2.1%, V 0.42%, Fe 15.6%, C 11.2%, SiO 2 21.6%, Al 2 o 3 2.2%, CaO 5.6%, MgO 2.3%, S 16.2%, P 0.22% molybdenum-nickel ore direct reduction smelting crude molybdenum-nickel alloy, the implementation process is: directly crush molybdenum-nickel ore to an average particle size of less than 0.18mm. Add slagging agent quicklime powder (CaO content is 92.3%) and sodium carbonate (Na 2 CO 3 98.8%), its batching ratio is molybdenum-nickel ore powder: unslaked lime powder: sodium carbonate=100: 15.4: 14.4 (weight ratio), (CaO+Na 2 CO 3 ) / (SiO 2 +S) = 0.9. Slagging agent CaO:Na 2 CO 3 =1:1. Add fluorite powder (CaF 2 87.6%). The average particle size of the above several charge materials is less than 0.18mm. According to the above batching method, add several materials with accurate weighing into the mixer and mix them well. The materials are pressed into Φ22-30mm pellets with a high-pressure double-roller briquetting machine, and the mois...

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Abstract

The invention relates to a method for preparing molybdenum nickel alloy by directly reducing and smelting molybdenum nickel ore. The method comprises the following steps: grinding the molybdenum nickel ore into molybdenum nickel ore powder with the average particle size of less than or equal to 0.18 mm; adding a slag forming agent and a reducing agent with the average particle size of less than or equal to 0.18 mm into the molybdenum nickel ore powder to obtain furnace charge; mixing the furnace charge uniformly and pelletizing to obtain pellet; heating the pellet to 1,600 to 1,800 DEG C; smelting; and collecting liquid alloy, slag, smoke dust and furnace gas respectively, wherein the liquid alloy is crude molybdenum nickel alloy; the direct yield of the molybdenum and the nickel is 96 percent and 94 percent respectively; the molybdenum content of the smoke dust is less than 0.2 percent and the nickel content of the smoke dust is less than 0.2 percent; and the SO2 concentration of thefurnace gas is less than or equal to 400 mg / m<3>. The process method is simple and reasonable, and convenient to operate; the molybdenum nickel ore is not subjected to oxidizing roasting de-sulfuration; and the crude molybdenum nickel alloy is prepared by directly reducing and smelting the molybdenum nickel ore and by using the carbon of the molybdenum nickel ore as a reducing agent, so that indirect smelting is changed into direct smelting. The prepared molybdenum nickel alloy is low in sulfur content and phosphorus content, environment friendly and low in production cost; and the method is suitable for extraction of the molybdenum nickel ore.

Description

technical field [0001] The invention relates to a method for directly reducing molybdenum-nickel ore to smelt a molybdenum-nickel alloy, and belongs to the technical field of mineral extraction metallurgy. Background technique [0002] There are a large number of stone coal mines in Hunan, Hubei, Sichuan, Guizhou, Guangxi, Chongqing, Shaanxi, Gansu, Xining and other provinces and cities in my country. Nonferrous metals such as vanadium, molybdenum, and nickel are often associated with such stone coal mines. Due to different ore-forming conditions and regional locations, the associated valuable elements in stone coal are also different. In some areas, the associated elements of stone coal are mainly vanadium, and in some areas, the associated elements of stone coal are mainly molybdenum. Usually Stone coal containing molybdenum is also accompanied by nickel, which is a molybdenum-nickel paragenetic ore, usually called nickel-molybdenum ore or molybdenum-nickel ore. Its assoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C19/03C22C27/04
Inventor 霍广生缪加坦朱和平
Owner CENT SOUTH UNIV
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