Hunan Golden Cave Golden Tungsten Plant

Hunan Gold Mining Co., Ltd. New Cave tungsten gold beneficiation plants of each mining area have some degree of associated tungsten ore, tungsten ore has proven reserves of 74,800 tons, with an average grade of tungsten 4.2 ‰, WO3 equivalent reserves of 314.93 tons. The design daily processing capacity of the newly-built Golden Tungsten Plant is 150 tons/day. From the perspective of economic and technical indicators such as resource quality, grade and recovery rate, the profit after production is very impressive.

Tungsten is widely used in modern technology in a pure metal state and in an alloy state. The most important alloy state is alloy steel, tungsten carbide-based cemented carbide, wear resistant and strong hot alloy. Tungsten is mainly used in the following industrial fields.

Most tungsten steel industry for the production of special steel. Widely used high speed steels contain 9% to 24% tungsten, 3.8% to 4.6% chromium , 1% to 5% vanadium , 4% to 7% cobalt , and 0.7% to 1.5% carbon. High-speed steel is characterized by high quenching and tempering temperature (700-800 °C) in the air, which can be automatically quenched. Therefore, it maintains high hardness and wear resistance up to 600-650 °C. Alloy tool steel, tungsten steel containing 0.8% to 1.2% tungsten; chromium tungsten silicon contains 2% to 2.7% tungsten; chromium-tungsten steel contains 2% to 9% tungsten; chromium-tungsten-manganese steel contains 0.5% 1.6% tungsten. Tungsten-containing steel is used in the manufacture of various tools such as drills, milling cutters, wire drawing dies, female and male dies, and pneumatic tools. The tungsten magnet steel is a permanent magnet steel containing 5.2% to 6.2% of tungsten, 0.68% to 0.78% of carbon, and 0.3% to 0.5% of chromium. The tungsten-cobalt magnet has a hard magnetic material of 11.5% to 14.5% tungsten, 5.5% to 6.5% molybdenum , and 11.5% to 12.5% ​​cobalt. They have high magnetization and coercive force.

Tungsten carbide based cemented carbide

The tungsten carbide has high hardness, wear resistance and refractory properties. These alloys contain 85% to 95% tungsten carbide and 5% to 14% cobalt, which acts as a binder metal which gives the alloy the necessary strength. Some alloys are mainly used in the machining of steel, further contains a carbide of titanium, tantalum and niobium. All of these alloys are manufactured by powder metallurgy. They still have high hardness and wear resistance when heated to 1000 to 1100 °C. The cutting speed of cemented carbide tools far exceeds the cutting speed of the best tool steel tools. Cemented carbide is mainly used in cutting tools, mining tools and wire drawing dies.

Heat and wear resistant alloy

The most refractory metal tungsten is a component of many heat-strength alloys, such as 3% to 15% tungsten, 25% to 35% chromium, 45% to 65% cobalt, and 0.5% to 2.75% carbon alloy. It is mainly used for parts with strong wear resistance, such as the valve of aero-engine, the working part of die-cutting hot knife, the turbine impeller, the excavating equipment , the surface coating of the plowshare.

Aviation and rocket technology, machine parts and the requirements, other sectors of the engine and a high hot strength in some instruments, to tungsten and other refractory metals (tantalum, niobium, molybdenum, rhenium) alloy used as a heat reinforcing material.

Contact material and high specific gravity alloy

Tungsten- copper (10% to 40% copper) and tungsten- silver alloys produced by powder metallurgy have both good electrical and thermal conductivity of copper and silver and wear resistance of tungsten. Therefore, it is a very effective contact material for manufacturing working parts such as a knife switch, a circuit breaker, and a spot welding electrode. a high specific gravity alloy having a composition of 90% to 95% tungsten, 1% to 6% nickel , 1% to 4% copper, and an alloy of iron-based copper (-5%) for manufacturing a rotor of a gyroscope , airplanes, counterweights that control the rudder, radiation shields for radioisotopes, and baskets.

Electric vacuum lighting material

Tungsten is used in tube production, radio electronics and X-ray technology with tungsten wire, tungsten tape and various forged components. Tungsten is the best material for white woven filaments and spirals. The high operating temperature (2200 ~ 2500 ° C) guarantees high luminous efficiency, while the small evaporation speed ensures long life of the wire. Tungsten wire is used to make the direct hot cathode and grid of the electron oscillating tube, the cathode of the high voltage rectifier and the side hot cathode heater in various electronic instruments. Use tungsten as the cathode and cathode of the X-ray tube and gas discharge tube, as well as the contacts of the radio equipment and the atomic hydrogen torch electrode. Tungsten wire and tungsten rods are heaters for high temperature furnaces (up to 3000 ° C). The tungsten heater operates in a hydrogen atmosphere, an inert atmosphere or a vacuum.

Sodium tungstate tungsten compounds used in the production of certain types of paints and pigments, as well as in the textile industry and for increased Bupi mixed with ammonium sulfate and ammonium phosphate and water to the refractory Bupi. Also used in the manufacture of metal tungsten, tungstic acid and tungstate as well as dyes, pigments, inks, electroplating, etc. Also used as a catalyst or the like. Tungstic acid is a mordant and dye in the textile industry and a catalyst used in the chemical industry for the production of high octane gasoline. Tungsten disulfide is used as a solid lubricant and catalyst in organic synthesis, such as in the preparation of synthetic gasoline.