The present invention relates to a process for recovering tungsten from low grade tungsten-containing tailing process, the technical field belonging to a wet extraction from the group of metal compounds in the ore or concentrate. Tungsten recovery process includes a buffer pool classification, flannel chute roughing, roughing shaker, yurts selection and shaker sweep the election process. Supporting the selection of the buffer pool 2, flannel chute 10 to 15, yurts from 2 to 4, Shaker 10 to 15 units. The mass percent of the treated low-grade tungsten-containing tailings W03 is 0.04 to 0.08%. Through the recovery of low-grade tungsten tailings, get a good grade and recovery, to increase the economic benefits of selected plants, but also to achieve the comprehensive utilization of resources.


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The invention discloses a method for machining tungsten and titanium alloy plates.

The method includes coarsely grinding upper and lower planes of the tungsten and titanium alloy plates; linearly cutting the side surfaces of the tungsten and titanium alloy plates; accurately grinding the upper and lower planes and the side surfaces of the tungsten and titanium alloy plates. The method for machining the tungsten and titanium alloy plates in an embodiment of the invention has the advantages that the characteristic of brittle quality of tungsten and titanium alloy is taken into consideration, the upper and lower planes of the tungsten and titanium alloy plates are coarsely ground at first when the tungsten and titanium alloy plates are machined in a step-by-step mode, then the side surfaces of the tungsten and titanium alloy plates are linearly cut, and the upper and lower planes and the side surfaces of the tungsten and titanium alloy plates are accurately ground ultimately, so that requirements on the tungsten and titanium alloy plates can be met gradually, and the problem of easiness in edge failure in tungsten and titanium alloy plate machining procedures due to an existing machining mode with a single step can be solved.




Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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The invention provides a recovery process for valuable metals in tungsten residues.

The tungsten residue treatment method comprises the following steps of: boiling tungsten residues and 15%-25% of hydrochloric acid for acid dissolution, further adding NaF and sodium nitrate, and filtering to obtain filtrate after the end of the reaction; then extracting tungsten from the filtrate by adopting N235, and evaporating, crystallizing and drying a stripping solution to obtain APT (ammonium paratungstate); and performing alkali dissolution on filtration residues, and performing pressure filtration to directly recover Ta, Nb and Sn valuable metals. Tungsten, scandium, iron, manganese, tin, copper, tantalum and niobium valuable elements and the like in the tungsten residues can be comprehensively recovered, thus the recovery cost is reduced.

The recovery process disclosed by the invention further has the advantages of good environmental benefits and low cost. According to the recovery process disclosed by the invention, the acid is adopted for dissolving the tungsten residues, the tungsten and the scandium are recovered under acid conditions, the other elements are simultaneously recovered, and the process is simple.


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A method for decomposition of scheelite, using a concentration of hydrochloric acid and a certain proportion of phosphoric acid complex decomposition, decomposition of the tungsten heteropoly acid form directly into the decomposing solution; and filtered to obtain a filtrate, the filtrate was extracted using the phosphorus N235 tungsten heteropolyacid; after extraction and separation, loaded organic phase with NaOH were stripping, raffinate Shen added calcium sulfate, and filtered to give hydrochloric acid recycling; stripping the organic phase was recycled, after stripping solution pH adjusted by acidification evaporation-crystallization available phosphorus sodium tungstate crystals. Advantages of the present invention is to change the traditional acid decomposition scheelite single idea, using hydrochloric acid, phosphoric acid complex decomposition of scheelite, a tungsten leaching rate increase; the concentration of tungsten extraction method using processing scheelite decomposition solution to improve the reduces the water consumption of tungsten smelting process, is conducive to the entire process of the water cycle; Shen calcium realized sulfuric acid decomposition reagent regeneration, greatly reducing the cost of production; phosphotungstic heteropoly salt prepared very versatile.




Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:   sales@chinatungsten.com
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