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Dephosphorizing process of molybdenum nickel ore

A technology of molybdenum-nickel ore and phosphorus-molybdenum, which is applied in the field of molybdenum-nickel ore, can solve the problems of high reagent consumption, low molybdenum leaching rate, air pollution, etc., achieve low reagent consumption and equipment consumption, obvious energy saving and consumption reduction, and high degree of mechanization Effect

Inactive Publication Date: 2013-04-17
JIANGSU UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The previous progress in this field mainly includes: For the low-grade nickel-molybdenum difficult-to-separate complex ore proposed in this project, there are currently two exploration options: one is the smelting process of nickel-molybdenum ore combined with pyro-wet method; Nickel-molybdenum ore all-wet smelting process, a combination of pyrotechnics and wet methods, its main feature is that it applies the smelting process of molybdenite, and uses pyrotechnic roasting and desulfurization followed by wet leaching process, which consumes a lot of reagents. The cost is high; more critically, when using this combination of fire method and wet method, it is difficult to effectively recover the nickel in the nickel-molybdenum ore, and the leaching rate of molybdenum is difficult to reach more than 90%; The process of extracting molybdenum and then extracting nickel by fire method, the difficulty of this route is due to the complex composition of molybdenum ore, especially when nickel sulfide exists, the leaching rate of molybdenum is low, and the remaining impurities will consume a large amount of acid and directly affect the metal. Recovery rate; therefore, from the existing technical research, it is found that there is currently no industrialized method for the efficient utilization of low-grade nickel-molybdenum difficult-to-separate complex ores; there is no doubt that with the further mining of rich ore and the strong global demand for nickel and molybdenum , the recovery of nickel and molybdenum from low-grade nickel-molybdenum ore has become an urgent problem to be solved
[0004] Chinese patent 99114736.7 provides a process for preparing molybdenum-nickel salt by direct leaching of molybdenum-nickel symbiotic raw ore with weak base and oxidant. Ammonium molybdate is extracted, and the raffinate is evaporated and concentrated to obtain nickel sulfate. This method is simple in equipment, easy to operate, and does not produce three wastes. It belongs to hydrometallurgy. The disadvantage is that the process is complicated and the consumption of reagents is large. , high cost; Chinese patent 200810132538.2 provides a molybdenum-nickel ore full-wet method for extracting molybdenum-nickel ore, which is a full-wet method for extracting molybdenum-nickel ore from black rock series molybdenum-nickel ore, which is characterized in that the finely ground molybdenum-nickel ore is Carry out pressure oxidation leaching to obtain nickel leaching solution containing nickel and molybdenum and leaching residue containing molybdenum oxide; then extract and separate molybdenum and nickel from the leaching solution to produce nickel salt and ammonium molybdate or molybdenum trioxide; Molybdenum is subjected to atmospheric pressure alkaline leaching, purification, and then acid-precipitating ammonium molybdate for recovery. The disadvantage is that the hydrometallurgical process is complicated, the reagent consumption is large, the cost is high, and the yield of molybdenum and nickel still has room for improvement.
However, there is no treatment for the product phosphorus. If it is directly emptied, the gaseous phosphorus will pollute the air, so there should be necessary recovery measures for the gas products after reduction and dephosphorization.

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  • Dephosphorizing process of molybdenum nickel ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment one: the preparation method and metallurgical effect of 10kg molybdenum-nickel ore, 4.23% phosphorus-content low-phosphorus molybdenum-nickel ore

[0021] The effective carbon content in the batching coke is 6.26%, that is, 0.626 kg;

[0022] Microwave parameter setting: the vacuum degree in the furnace is 110Pa, the frequency is 2.45GHz, the power is 200kW, the reduction temperature is 1020°C, and the reduction time is 25min;

[0023] The amount of recovered solid white phosphorus: 0.323 kg, the recovery rate of white phosphorus is 76%;

[0024] Table 1 lists the content of main elements in molybdenum-nickel ore before and after microwave vacuum thermal reduction treatment when [P]=4.23%;

[0025] Table 1 Comparison data of main elements content in molybdenum-nickel ore before and after microwave vacuum thermal reduction treatment when [P]=4.23%

[0026] Ni Mo S P Fe C V After original 120℃ drying 8.79 12.81 42.24 4.23 16.9...

Embodiment 2

[0028] Embodiment two: the preparation method and the metallurgical effect of the low-phosphorus molybdenum-nickel ore of 20kg molybdenum-nickel ore, 5.01% phosphorus content

[0029] The effective carbon content in the coke added to the ingredients is 7.42%, that is, 0.742kg;

[0030] Microwave parameter setting: the vacuum degree in the furnace is 100Pa, the microwave frequency is 2.45GHz, the power is 450kW, the reduction temperature is 1150°C, and the reduction time is 38min;

[0031] The amount of recovered solid white phosphorus: 0.755 kg, the recovery rate is 75%;

[0032] Table 2 lists the content of main elements in molybdenum-nickel ore before and after microwave vacuum thermal reduction treatment when [P]=5.01%;

[0033] Table 2 Comparison data of main elements content in molybdenum-nickel ore before and after microwave vacuum thermal reduction treatment when [P]=5.01%

[0034] Ni Mo S P Fe C V After original 120℃ drying 9.79 11.94 4...

Embodiment 3

[0036] Embodiment three: the preparation technology and the metallurgical effect of the low-phosphorus molybdenum-nickel ore of 30kg molybdenum-nickel ore and 8.75% phosphorus content

[0037] The effective carbon content in the coke added to the ingredients is 7.42%, that is, 0.742kg;

[0038]Microwave parameter setting: the vacuum degree in the furnace is 95Pa, the microwave frequency is 2.45GHz, the power is 300kW, the reduction temperature is 1100°C, and the reduction time is 30min;

[0039] Recovered solid white phosphorus amount: 1.943 kg, the recovery rate is 74%;

[0040] Table 3 lists the content of main elements in molybdenum-nickel ore before and after microwave vacuum thermal reduction treatment when [P]=8.75%;

[0041] Table 3 Contents of main elements in molybdenum-nickel ore before and after microwave vacuum thermal reduction treatment when [P]=8.75%

[0042] Ni Mo S P Fe C V After original 120℃ drying 8.92 12.18 40.35 8.75 17....

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Abstract

The invention relates to molybdenum-nickel ore, in particular to a method for dephosphorizing molybdenum-nickel ore. The present invention uses sulfide ore (containing phosphorus) containing molybdenum and nickel as raw materials, and obtains low-sulfur molybdenum-nickel ore through oxidation and roasting to remove sulfur, and carbon powder is added to the low-sulfur molybdenum-nickel ore according to the phosphorus content, and placed in a microwave vacuum furnace Medium sintering, adjust the frequency and power of microwave heating, through the carbon reduction reaction under microwave vacuum, the product gaseous elemental phosphorus and the generated CO volatilize into the exhaust channel, recover white phosphorus, and obtain low-phosphorus molybdenum-nickel ore after magnetic separation and separation of solid products .

Description

technical field [0001] The invention relates to molybdenum-nickel ore, in particular to a method for dephosphorizing molybdenum-nickel ore. Background technique [0002] Nickel and molybdenum are important strategic metals. Due to their unique physical and chemical properties, they become the matrix, main component or additive of advanced structural materials and functional materials, such as nickel-based superalloys, nickel-molybdenum alloy steel, etc., are widely used in In the fields of national economy, national defense and military industry; with the large-scale mining of mineral resources in recent decades, there has been a shortage of resource reserves around the world, especially in recent years, with the rapid development of China's economy, the contradiction between supply and demand has increased, nickel The price of non-ferrous metals such as molybdenum and molybdenum has soared; nickel-molybdenum ore is a unique multi-metal complex mineral resource in China, mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/11C22B1/02
Inventor 李桂荣王宏明
Owner JIANGSU UNIV