Ultrafine Tungsten Powder Preparation from ART Self Reduced Tungstate

ultrafine tungsten powder image

At present, in the production of tungsten powder, most of the tungstate thermal decomposition of blue tungsten oxide, blue tungsten oxide hydrogen reduction process to tungsten powder. The conventional process generally uses ammonium paratungstate as the initial raw material, but it is difficult to obtain ultrafine tungsten powder with average particle size of less than 1 micron by hydrogen reduction.

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Leaching Process of High Calcium Wolframite Concentrate

leaching process of high calcium wolframite concentrate image

China has abundant tungsten resources, and reserves and concentrate output rank first in the world. However, the tungsten concentrates produced in several important tungsten mines belong to high calcium wolframite concentrates. At the same time, a considerable amount of refractory tungsten slime containing calcium is produced in each tungsten concentrator. There is no suitable treatment method at present.

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Supported Phosphotungstic Acid Catalyst Preparation

supported phosphotungstic acid catalyst preparation image

Carboxylic esters are a kind of basic organic chemical raw materials. They are widely used in perfumes, flavors, plasticizers, solvents, resins, coatings, cosmetics, pharmaceuticals, surfactants and organic synthetic intermediates. They have broad market demand at home and abroad.

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Tungstic Manganese Calcium / Mesoporous Tungsten Trioxide Composite Catalyst

tungstic manganese calcium / mesoporous tungsten trioxide composite catalyst image

Hydrogen is a kind of clean energy with high calorific value, friendly environment and convenient transportation. The combustion product is water, which does not cause any harm to the environment. The earth is rich in water, easy to get and cheap. Sunlight is an ideal way to convert solar energy into chemical energy.

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Tungstate Nanomaterials Preparation by Low Temperature Hydrothermal Method

tungstate preparation by hydrothermal method image

Tungstate nanomaterials have been widely used in many fields, such as optics, electricity, magnetism, conductor/superconductor, catalysis, biology and so on. The synthesis methods of transition metal tungstate materials mainly include sol-gel method, copolymer-assisted synthesis method, inverted micelle soft template method, wet chemical method and solution synthesis method.

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Composition of Tungsten Carbide Mining Button

tungsten carbide mining button picture
The operation condition of tungsten carbide mining button beading layer is relatively complicated. During the cutting of coal and rock, the mining button not only needs to bear cyclic pressure, tangential stress and the effect of impulsive load but also have to stand the long-time abrasive wear, the temperature rise caused by impacting force and the corrosion caused by corrosive medium.

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Damage Mode of Tungsten Carbide Mining Button

tungsten carbide mining button picture

Through some domestic studies about the damage mode of tungsten carbide mining button, the analyses of mining button and shock resistance experiments, there are some reasons for the invalidation which are listed as below:

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Invalidation Mode of Tungsten Carbide Rock Drilling Button

rock drilling button picture

The invalidation modes of tungsten carbide rock drilling button include the phenomenon of thermal fatigue and the detachment of the button. 

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Tungsten Products Extraction from Ammonium Paratungstate Solid Waste

tungsten products extraction from ammonium paratungstate solid waste image

Ammonium paratungstate is an important tungsten intermediate chemical products, mainly white crystals, there are two kinds of flake or needle, used to make tungsten trioxide or blue tungsten oxide metal tungsten powder, also used to make ammonium metatungstate and other tungsten compounds.

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SCR Waste Catalyst Reemployment Project

scr waste catalyst image

Nitrogen oxide (NOx) is one of the sources of air pollution and poses a great threat to human health. Thermal power plant is one of the main sources of NOx emission. At present, the main dry flue gas denitrification method is selective catalytic reduction (SCR), the key part of which is catalyst.

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