Method for efficiently removing molybdenum based on extraction-precipitation combination

Abstract

The invention discloses a method for efficiently removing molybdenum based on extraction-precipitation combination. The method comprises the following steps that an extraction organic phase is formed by using methyl trioctyl ammonium chloride as an extraction agent, tributyl phosphate as a cosolvent and sulfonated kerosene as a diluent, and meanwhile, the organic phase extraction agent is transformed, so that tungsten in an acid system can be extracted, or the tungsten in a molybdenum-containing sodium tungstate solution can be extracted, the separated sulfuric acid and phosphoric acid are returned for use, the negative tungsten organic phase is subjected to reverse extraction with ammonia water, a high-concentration ammonium tungstate solution can be obtained, and cation transformation is achieved. According to the method provided by the invention, the content of impurity molybdenum can be effectively removed.

Description

technical field [0001] The invention relates to a method based on extraction-precipitation combined with high-efficiency molybdenum removal, which belongs to the field of wet tungsten metallurgy. Background technique [0002] Tungsten is an insoluble non-ferrous metal with high melting point, high hardness, strong ductility, wear resistance and corrosion resistance. Metal tungsten and various tungsten alloys are widely used in modern technology, among which, the most important ones are alloy steel, tungsten carbide-based hard alloy, wear-resistant and heat-resistant alloy. Tungsten metallurgy is a traditional advantageous industry in my country, its reserves account for about half of the world's reserves, and it plays an irreplaceable leading role in the world's tungsten market. In the series of tungsten products, molybdenum is a strictly controlled impurity element. According to the requirements of APT-0 grade product of ammonium tungstate "GB10116-2007" in the national st...

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Problems solved by technology

At present, the relatively mature selective precipitation method, ion exchange molybdenum removal method, molybdenum trisulfide precipitation method, hydrogen peroxide complex system extraction and separation of tungsten and molybdenum method, etc. all have their own characteristics, and they all have good tungsten and molybdenum in suitable environments. Molybdenum separation effect, but the above-mentioned processes all have their applicable conditions and pH range. For the ammonium tungstate solution with low impurity content except high molybdenum concentration, the above-mentioned methods have high cost, low purity, and repeated smelting energy consumption. Different problems such as large, poor molybdenum removal effect or serious environmental pollution

[0004] The patent with the publication number of CN 113073212A discloses a flotation-type tungsten raw material extraction full-wet smelting process, which specifically discloses the production process including leaching, solid-liquid separation, purification, sulfidation, acid adjustment and molybdenum removal, extraction, stripping and crystallization. The process of ammonium paratungstate product, by adding defoamer and oxygen-enriched gas in the leaching process, suppresses the influence of surfactant in sodium tungstate solution on the production process, and effectively improves the quality of ammonium paratungstate product; the publication number is CN 104120257A The patent discloses a method for extraction and separation of tungsten and molybdenum, specifically discloses the use of N263-sec-octanol-kerosene system to extract and separate ammonium tungstate solution, first prepare the sulfurized organic phase, and then extract and remove molybdenum. Starting with the configuration, vulcanization process, and stripping process, the problem of low efficiency and high cost of molybdenum removal by traditional ammonium tungstate extraction is solved. The operating environment has a great influence

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