Preparation Method for Rare Earth Oxide Doped Tungsten Powder

The present invention provides a method for producing a rare earth-doped tungsten oxide powder, a refractory metal belonging to the technical field of rare earth materials.

Process: First, low-temperature combustion synthesis method using rare earth oxides (Sc2O3, Y2O3, La2O3, CeO2, ZrO2, Gd2O3 and Eu2O3 one or several) and tungsten oxide precursor powder uniformly mixed, and then the precursor powder was calcined in a muffle furnace, and finally the two-step reduction in a hydrogen or cracked ammonia atmosphere. Easily reducible tungsten oxide is reduced to tungsten powder, but can not restore rare earth oxide particles retained, resulting in rare earth oxide doped tungsten powder. Oxides of rare earth doped rare earth oxide content of the tungsten powder is 0.05 ~ 35wt%;.

Advantages of the present invention is that the target element, and an organic carbon source to form a highly dispersed system of fine and uniform particle size of the resulting oxide. Due to the low cost of raw materials, reaction speed, low power consumption, simple process, and therefore more suitable for industrial production.

rare-earth-oxide


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Method for Recycling Tungsten and Ammonia in One Step From Ammonium Paratungstate Crystallization Mother Solution Smelt Through Tungsten

The invention discloses a method for recycling tungsten and ammonia in one step from an ammonium paratungstate crystallization mother solution smelt through tungsten.

After the ammonium paratungstate (APT) is subjected to evaporative crystallization, a mother solution is pumped into a reaction kettle for stripping treatment, calcium oxide with content above 90% or calcium hydroxide with content above 95% are added into the mother solution, a stripping process which is commonly used in the crystallization mother solution in the APT preparation process is utilized to recycle the ammonia, the reaction temperature is in a range from 25 DEG C to 90 DEG C, when the ammonia is subjected to gas-liquid separation through condensation concentration, the ammonia is sprayed with a hydrochloric acid to prepare ammonium chloride to return to a main process to prepare an analytical solution, white tungsten slag returns to a pressure boiling process, when a potential of hydrogen (pH) value of a reaction system is maintained in a range from 9 to 11 and concentration of ammonia nitrogen in water is reduced to about 30mg/L, the reaction is finished, and a waste liquid free of the ammonia nitrogen is subjected to a mixing treatment with an ion exchange post-liquid which is generated in the main process working procedure.

The method has the advantages that the process procedures are greatly simplified, the tungsten deposition rate is high, the process is simple, the operation is easy, and the treating cost is slightly low.


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Titanium and Tungsten Composite Oxide Powder Half-dry Mixing Preparation Method

The invention belongs to the field of environmental protection, and in particular relates to a synthetic method of a double-component composite oxide containing TiO2 and WO3.

The synthetic method comprises steps of: taking an appropriate amount of metatitanic acid solid, and utilizing an intensive mixer half-dry mixing method to break the metatitanic acid solid into small particles; at the same time, dissolving ammonium paratungstate in an ethanol amine or hydrogen peroxide-nitric acid solution under the heating condition; then directly adding the ammonium paratungstate solution and a surfactant into the small metatitanic acid particles, and utilizing ammonia water to regulate the pH value of a material; and adopting an intensive mixer to mix and drain the material for a while, then directly calcining the material in a rotary kiln for 3-8 hours, milling a calcined product through utilizing a ball mill or a superfine mill, and thus synthesizing a TiO2-WO3 composite oxide powder. The crystal form of the obtained TiO2-WO3 composite oxide is in an anatase structure, the TiO2-WO3 composite oxide particles are uniform, and the specific surface area of the TiO2-WO3 composite oxide is suitable (80-150m<2>/g).

According to the method, a half-dry mixed head product can be directly calcinated; the method has the characteristics of controllable product ingredients, excellent performance, simple operation process and the like, and can be easily used for large-scale industrial production; and moreover, a pollutant-ammonia is exhausted in a gas phase and easily controlled.


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Method and System for Producing High Compact Strength Tungsten Powder

Disclosed is a method for producing high compact strength tungsten powder.

Ammonium paratungstate and purple tungsten oxide serving as raw materials are uniformly mixed according to a certain proportion, mixed powder is placed into a hydrogen reduction furnace, the thickness of a material bed is 5-25mm, the mixed powder is heated up to 700-1100 DEG C at the speed of 5-20 DEG C/min and is directly reduced with hydrogen, holding time is 1-5 hours, the dew-point temperature of the hydrogen ranges from -40 DEG C to -65 DEG C, and finally, reduced powder is sieved to obtain the high compact strength tungsten powder. The tungsten powder produced by the method can be pressed into high-strength compact without adding any forming agents, the compact strength of the tungsten powder is as high as 3.0-5.0MPa, and a tungsten product made of the tungsten powder has the advantages of high density, fine high-temperature resistance, stable quality and the like.

The preparation method and preparation steps are quite simple, and technological parameters of the preparation process are easily controlled.


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Preparation Method for High-purity Ammonium Paratungstate

A high-purity preparation of ammonium paratungstate, characterized in that the preparation of raw materials, including an ion-exchange method or the extraction of the total content of the impurities produced in the total content of impurities to achieve ≤177.5ppm GB 0 APT or production process of ≥ 177.5ppm defective APT, the method comprising the steps of: preparing a raw material was calcined to produce a tungsten oxide; the production of ammonia dissolved tungsten trioxide, ammonium tungstate to form a solution; solution of ammonium tungstate was evaporated generated crystallization of ammonium paratungstate to obtain a wet crystal; paratungstate, and the wet crystals were dried and sieved to obtain a total content of impurities of high-purity ammonium paratungstate ≤65ppm.

The present invention optimizes the production process of high purity APT, improve product quality, reduce production costs of high purity APT products.

APT


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A Process for Recycling of Tungsten Carbide Alloy

The present disclosure is a process for the recycling of tungsten carbide alloy. Tungsten carbide alloy scrap is heated in an oxidizing atmosphere and the oxidized material is pulverized by grinding. The powder material is treated with a carburizing mixture for reducing and carburizing the powdered tungsten oxides and other metal oxides. The method is cost effective and environment friendly.

A method for recovering tungsten carbide, comprising the steps of: a) oxidation of the tungsten oxide to obtain tungsten alloy and other metal oxides; b) milling the tungsten oxide and other metal oxides to obtain a powder; and c ) the mixture was treated with a carburization reducing and carburizing powder of the tungsten oxide powder and other metal oxides to obtain a purified tungsten carbide alloy powder.

tungsten-carbide


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Method for Recovering Tungsten From Tungsten-containing Fluorite Mine

The invention relates to a method for recovering tungsten from tungsten-containing fluorite mine.

Sulfuric acid and tungsten-containing fluorite mine are mixed at a mass ratio of 0.8:1 to 1.5:1, cured, and then roasted at 200-500 DEG C, a fluorite mineral is subjected to acidolysis by sulphuric acid to release hydrogen fluoride (HF), a tungsten mineral is subjected to acidolysis by sulphuric acid to become tungsten trioxide, and the HF and the tungsten trioxide continue to react to generate tungsten hexafluoride (WF6) or tungsten oxytetrafluoride (WOF4); the HF, the WF6 and the WOF4 are all volatile matters and enter roasted flue gas, the flue gas is washed, absorbed and hydrolyzed to obtain tungstic acid, the washed gas is used for producing hydrofluoric acid, and the volatilization rate of fluorine can be higher than 95% while the volatilization rate of tungsten can be higher than 90%.

The method for recovering tungsten from tungsten-containing fluorite mine has the advantages that when hydrogen fluoride is prepared, tungsten is fluorated and volatilized and then enters flue gas to achieve high-efficiency extraction of tungsten; the method can be used to treat mixed concentrate produced by bulk flotation of tungsten and fluorite, a flotation-metallurgical process is greatly simplified, and a comprehensive recovery rate is increased.

tungsten-containing-fluorite-mine


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Method for Processing Tungsten Powder Wastes

The invention discloses a method for processing tungsten powder wastes. The method comprises the steps as follows: oxidizing the tungsten powder wastes to convert tungsten into tungsten oxide; and carrying out reaction between the oxidized tungsten powder wastes and alkali to convert the tungsten oxide into tungstate. According to the method, the tungsten powder wastes can be effectively processed.

A method of processing waste tungsten powder, characterized by comprising: tungsten powder scrap for the oxidation treatment, so that the tungsten is converted to tungsten oxide; and allowing the tungsten powder to oxidation treatment after the waste react with a base to The conversion of the tungsten oxide is a tungstate.

tungsten-powder


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Method for Producing Ammonium Paratungstate by Using Tungsten-containing Waste Material

The invention discloses a method for producing ammonium paratungstate by using a tungsten-containing waste material, which relates to a tungsten secondary resource cycling utilization method.

The method comprises the following steps: 1) performing acid pickling and removing impurity; b) drying and oxidizing; c) transiting; d) purifying and e) evaporating and crystallizing an ammonium tungstate solution and then drying to obtain the ammonium paratungstate product; wherein the tungsten-containing waste material is a metal tungsten-containing waste material or a tungsten carbide waste material. Compared with the prior art, the method for producing ammonium paratungstate by using the tungsten-containing waste material employs a production process which is characterized in that tungsten oxide is directly converted to ammonium tungstate, the flow is short, the waste ammonia gas through evaporation and crystallization as well as waste water are recovered and reused, the discharge capacity of exhaust gas and waste water can be greatly reduced, and tungsten recovery rate is increased.

APT


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Method for Preparing Refractory Foam Metal Tungsten

The invention discloses a method for preparing refractory foam metal tungsten, and belongs to the technical field of preparation of porous high temperature alloys.

The method comprises the following steps: firstly, synthesizing and preparing a tungsten oxide precursor by a solution method; secondly, selectively reducing the tungsten oxide precursor in hydrogen to obtain metal foam tungsten with nanoscale crystal grains; thirdly sintering the obtained metal foam tungsten in hydrogen at different temperatures; and finally, obtaining metal foam tungsten with different porosities, pore diameters, particle sizes and strengths.

By the method, the problem of obtaining superhigh porosity of refractory metal is solved; and the refractory foam metal tungsten has the advantages of strong designability of the porosity and the pore diameter, low cost, high utilization rate of a powdery raw material, high strength at high temperature, applicability to high-temperature-resistant, corrosion-resistant and oxidation-resistant conditions, and the like.


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