Dephosphorizing process of molybdenum nickel ore

Abstract

The invention relates to a molybdenum nickel ore, in particular to a dephosphorizing process of the molybdenum nickel ore. According to the invention, the method comprises the steps of adopting sulphide ore (containing phosphorus) containing a molybdenum nickel component as a raw material; and oxidizing and roasting the sulphide ore to remove the phosphorus so as to obtain a low-phosphorus molybdenum nickel ore; adding carbon powder to the low-phosphorus molybdenum nickel ore according to the phosphorus content; and then placing the low-phosphorus molybdenum nickel ore in a microwave vacuum furnace to be sintered; adjusting microwave heating frequency and power so as to carry out carbon reduction reaction through microwave in a vacuum state; volatilizing product gaseous elemental phosphorus and the generated CO to enter a gas exhaust passage and recycling the phosphorus and the CO to obtain white phosphorus; and magnetically separating a solid product to obtain the low-phosphorus molybdenum nickel ore.

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...

AI Technical Summary

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.

Images