A Tungsten Tailings Recovery Process From Low-grade Tungsten

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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Recovery Process for Valuable Metals in Tungsten Residues

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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Method for Machining Tungsten and Titanium Alloy Plates

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.

tunsten-plate


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A Method for Decomposing Method Scheelite

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.

scheelite


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Tungsten Slag Treatment Method

The present invention discloses a tungsten slag processing methods.

The tungsten slag processing method comprising the steps of: dissolving the feeding step, the tungsten residue and 50 ~ 65 ℃, HCl 15% to 30% of the mixed solution, and a stabilizer is added tungsten, after the completion of the reaction, and filtered to give an acidic solution; and recovering tungsten steps, the use of weakly basic anion exchange resin of the acrylic acid solution in the tungsten, the end of the liquid to obtain I, analytical-exchange resin with sodium hydroxide solution to give tungstate, sodium tungstate recovered from the obtained sodium tungstate.

Technical solutions applied to the present invention, the use of low temperature atmospheric leaching solution of HCl tungsten slag, tungsten recovered directly next method in acidic conditions, the recovery process is simple and low cost.

tungsten-slag


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Method for Separating Tungsten And Tin From Tungsten/Tin-containing Concentrate

The invention relates to a method for separating tungsten and tin from tungsten/tin-containing concentrate, particularly a method for treating tungsten/tin-containing concentrate by a leaching process, preparing a sodium tungstate product and entering a tin smelting process, belonging to the technical field of hydrometallurgy. The method comprises the following steps: adding tungsten/tin concentrate containing 3-10% of tungsten and 30-50% of tin into a stoichiometric sodium hydroxide solution, leaching at 150-160 DEG C under the pressure of 0.5-1 MPa, and concentrating to crystallize the leach solution to obtain sodium tungstate; and sending the tin metal in the leached slag into the tin smelting process.

The method can extract tungsten from tin concentrate more simply and effectively, so that the tungsten can be well separated from other metals; and meanwhile, the method can optimally compromise environment protection and economic benefit.


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An Electrochemical Tungsten Surface Was Treated for

An electrochemical solution for surface treatment of tungsten carbide, which include sodium carbonate, sodium citrate and water, the ratio of parts by weight: 15-20 of sodium carbonate, sodium citrate, 5-10, 70-80 water. Advantages of the present invention are: the human body without harm, low non-toxic, environmentally friendly, cost, can significantly improve the efficiency of tungsten retreat. The solution adopted for the electrochemical back corrugating roller, tungsten carbide layer can be drained away at the surface of about 4 to 6 hours.

An electrochemical solution treatment of the tungsten carbide surface, characterized in that it comprises sodium carbonate, sodium citrate and water, the parts by weight ratio of: sodium carbonate, sodium citrate 15-20 70 Water 5-10 -8`0.


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Tungsten-removing Treatment Method of Tungsten Carbide Work Piece

The invention relates to the technical field of tungsten-removing treatment methods and provides a tungsten-removing treatment method of a tungsten carbide work piece, which has no damages on human bodies and no toxin, and is environmental friendly and low in cost. The tungsten-removing treatment method comprises the following technical steps of: washing the tungsten carbide work, clamping, preparing electrolyte, removing a coating and washing.

The withdrawal of tungsten carbide workpiece processing method characterized by comprising the following process steps: (1) tungsten carbide workpiece cleaning: first with cleaning liquid carbide workpiece, the workpiece surface to remove oil tungsten carbide, tungsten carbide with water Rinse the workpiece; (2) clamping: tungsten carbide workpiece fixture, so that the tungsten carbide is rotatably secured to the workpiece at both ends of the cell; (3) the preparation of the cell electrolyte: Add in an electrolytic cell in a ton water and then added to 50kg of Na2CO3UOkg potassium sodium tartrate and stirred and dissolved; (4) removal of the coating: tungsten carbide workpiece as anode and a stainless steel plate as the cathode, turn on the power, so that the workpiece is rotated in the electrolytic tank tungsten carbide, full contact with the electrolyte, an electrolytic reaction occurs, the current density at (200-300) * Wu DL (A ^ m2), the electrolytic solution controlled at 10-13 PH, temperature controlled at 20-80 ° C, the electrolysis reaction time is 12 hours; (5) Cleaning: Remove tungsten carbide workpiece after electrolysis, its surface with water to rinse.


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Process for Production of Aqueous Ammonium Tungstate Solution

A process for producing an aqueous ammonium tungstate solution, comprising the steps of: adding sulfuric acid to a solution containing tungstate ions; bringing the sulfuric-acid-containing solution into contact with an anion exchange resin; and bringing the anion exchange resin into contact with an aqueous solution containing ammonium ions. The method can inhibit the generation of salts, while efficiently recover tungsten.

A method of preparing an aqueous solution of ammonium tungstate, comprising the steps of: a solution containing tungstate ion in sulfuric acid; adding the sulfuric acid which has the solution with an anion exchange resin; the anion exchange and contacting the resin with an aqueous solution containing ammonium ions.


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Method for Producing High-pressure Blank Intensity Tungsten Powder by Ammonium Paratungstate Direct Reduction

The invention belongs to the field of powder metallurgy to paratungstate as raw materials, high-pressure direct reduction of green strength of tungsten powder production methods.

Comprising at 700 ~ 1000 ℃ and a hydrogen atmosphere and a hydrogen reduction treatment using recycled, screening impurity. The invention is in the reduction treatment process to avoid the deposition of the tungsten powder to grow up, and incomplete development of the particle morphology and the formation of irregular aggregates or loose crosslinked structure, thereby facilitating press-forming. Which has a shorter production process, the method is simple, advanced, easy to operate controls, reliable, high-purity tungsten powder, combined with high strength, stable quality, which compacts strength of up to 2.0 ~ 3.6MPa, sintered products for large density, high temperature good performance characteristics. It can be widely used in aviation, aerospace production flamethrowers, rocket flight rudder and other parts. BACKGROUND overcome poor formability of tungsten powder, compacts highest intensity 2.0MPa only and can not be further increased, can not meet the aviation, aerospace require the use of other ills.


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