Method for removing iron and regenerating tungsten powder from high-iron reduced tungsten powder

Abstract

The invention discloses a method for removing iron and regenerating tungsten powder from high-iron reduced tungsten powder, and belongs to the field of nonferrous metallurgy. The method is characterized in that the high-iron tungsten powder is used as a raw material, and is mixed with an acidic high-valence iron dissolution liquid and an additive, the low-temperature dissolution treatment is carried out at the temperature of 3-15 DEG C under an ultrasonic condition for iron removal, after dissolution, the insoluble tungsten powder and a ferrous dissolution liquid are obtained through separation, the gradient washing treatment is carried out on the insoluble tungsten powder, so that the residual ferrous dissolution liquid is fully washed out, moreover, the phenomenon that the iron is hydrolyzed and is left in the tungsten powder is avoided, and drying and cooling are carried out on the washed wet tungsten powder to obtain a pure tungsten powder product. According to the method, the ironis simply and efficiently removed from high-iron-containing boat charge generated in the tungsten powder reduction process, moreover, purification and regeneration of the tungsten powder are realized, the system water is completely recycled, no waste water and waste residue are discharged, and the method is suitable for the tungsten powder which is at the edge of a boat and generated in various tungsten oxide reduction processes and the tungsten powder product polluted by an iron ware, and has the advantages of being high in raw material adaptability, simple in technological process, thoroughin iron removal, clean and environment-friendly.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and non-ferrous metal metallurgy, and more specifically relates to a method for removing iron from high-iron reduced tungsten powder and regenerating tungsten powder. Background technique [0002] Tungsten powder is widely used in the production and processing of hard alloys, high specific gravity alloys, tungsten-molybdenum alloys, and pure tungsten parts. It is an important strategic rare metal. my country is a country with a large amount of tungsten resources. The tungsten ore is extracted by hydrometallurgy into an APT intermediate product, and then calcined to obtain tungsten oxide and reduced to obtain metal tungsten powder. These two processes are mainly carried out in the reduction furnace. The stainless steel crucible is used as the carrier or directly loaded into the rotary reduction furnace. Since the crucible and high-temperature components in the reduction furnace are mostly iron mate...

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Problems solved by technology

These two processes are mainly carried out in the reduction furnace. The stainless steel crucible is used as the carrier or directly loaded into the rotary reduction furnace. Since the crucible and high-temperature components in the reduction furnace are mostly iron materials, they will be directly or indirectly pulled together under high temperature conditions. The tungsten powder contacts and spreads to cause the tungsten powder to be polluted, especially the iron content in the tungsten powder attached to the inner wall of the boat carrying tungsten oxide reaches 0.5% to 3%, which seriously affects the processing performance of tungsten products and cannot be directly applied downstream. Product preparation requires iron removal treatment. At present, there is no economical and effective method, which has become a common problem in the production process of tungsten powder. The production process is as follows: figure 1 shown

[0003] Both patent CN103506216A and patent CN106140459 disclose the method of removing iron from the target powder by magnetic separation, but here the iron-containing tungsten powder is produced at high temperature and will form eutectic bonding with tungsten, such as magnetic separation will cause tungsten loss or removal. The iron is not thorough; patent CN102897782A discloses a process for removing iron, and the high-temperature and high-acid environment it adopts is not suitable for the high activity characteristics of tungsten powder, which will cause tungsten powder to oxidize and increase oxygen; patent CN103924092A discloses a recycling of waste tungsten powder method, the principle is to produce sodium tungstate after high-temperature alkali-melting tungsten powder, and then merge it into the production process of APT and tungsten powder. The process is long and the consumption of reagents is large.

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