First of all, the time of erosion has an influence on the efficiency of tungsten carbide porous nozzle for drilling. Generally, if erosion time is longer, the aperture, hole depth and the broken volume will increase. However, the raising trends will be different due to various types of nozzles. As tungsten carbide porous nozzle, with time goes by, the hole depth and broken volume will increasing remarkably at the beginning and tend to gently. It is proves that the principle of water-flow for rock cracking is a dynamic process and has obvious periodicity.

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There are two common difficulties when tungsten carbide sand-blasting is working. One is the difficult suction, the other one is about abrasion. The main reason is the size of the sand entry is too small and the vacuum is not enough. While the inside blowhole do not match the straight section mixed with sand and water or the material of straight section mixed with sand and water is inappropriate so that the nozzle is badly abrasive.

Therefore, the quality of tungsten carbide sand-blasting nozzle is determined by inhaling tube diameter, the size of blowhole, the straight sections and the materials. Controlling the distance of nozzle and steel plate is the most importance to achieve the best result. In addition, adding corrosion inhibitor will prevent the metal surface from two-stage oxidation.

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It not only enhances the hardiness of film, but also improves mechanical and anti-fatigue performance. Regardless of inhale-type dry sand blaster, press-in dry sand blaster or fluid sand blaster, tungsten carbide nozzle is an essential part of them. The sand-blasting processing is widely used in surface derusting, which caused by electrochemical corrosion and leaves many pits on that.

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The Sand-blasting processing uses the impact energy of high-speed sand flow and compressed air to coarsening and cleaning the surface of matrix. It consists of copper mine sand, emery and quartz sand, etc. Through impacting and cutting on the surface of work pieces by grinding compound, the surface and the shape of metal work pieces will be changed for getting roughness and cleanliness.

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According to the media, another tungsten carbide media atomizing nozzle can be specifically divided into vapor atomization, air atomization. In accordance with atomizing method can be divided into bubble atomization and pneumatic atomization. By means of fluid such as air or steam high-speed jet speed coaxial or vertical direction is atomizing liquid column or film, which also called as the two-fluid atomizing nozzle.

This kind of nozzle accelerated surrounding airflow flowing and took advantage of high-speed (normally tens of meters per second), and even ultrasonic air or steam contacted with the liquid column and film of low-speed liquid each other to vibrate, friction, finally come in to be droplets.

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The technology of producing coarse, medium, fine or superfine W/WC powder and nano size W/WC powder in Chongyi Zhangyuan, Dayu Weiliang, Ganzhou Yuan-chi etc. can catch up with the most advanced level in china. Series of products are sold to European, American and Asian markets.

1,000 tons of hard facing materials invested by Chongyi Zhangyuan and American Inframat Corporation and 1 million pieces of cemented carbide tools with its own properties invested by Chongyi Zhangyuan Tungsten Co., Ltd. are in construction. The project of 3,000 tons of cemented carbide invested by Zhongrui Company, and the project of 700 tons of tungsten rods invented by Jiangxi Yaoshen are all under construction.

Tungsten industry makes great progress in recent years. Sales value in 2006 is 11.03 billion RMB, which is 14.5 times more than that in 2000. Tax income is 1.62 billion RMB, which is 36.7 times more than that in 2000. The average growth rate of sales value is 158% and tax income 184%.

We will pay much attention to economizing resources, protecting environment and developing harmoniously. And we are taking measures in protecting environment and improving the level of utilizing resources and solving the problems due to exploring.





 

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There are 66 tungsten enterprises in Ganzhou, 19 of which are of good strength. The yearly capacity is 45,000 tons of APT, 25,000 tons of tungsten bars, 6,000 tons of W-Fe, 2 billion meters of Tungsten wire, and 3,000 tons of cemented carbide (including heavy alloy). In 2006, the shares of tungsten products in Ganzhou are Tungsten concentrate 30%, APT 65%, W-Fe 40%, W power 30%, tungsten bars 25%, tungsten wire 8% and cemented carbide 8%.

The technology of producing APT in Ganzhou is the most advanced in the world. Its technology of scheelite recovery and the mixed flotation dressing has been popularized. The technology called “Milling, ion-exchange,

continuous-crystallization” has been employed in tungsten metallurgical process in Chongyi Zhangyuan Tungsten Co. Ltd. and in APT with particle size from 1 to 50 µm and various crystal shapes could be produced. Jiangxi Tungsten Alloy Company produces W-Fe of high quality by using low-level tungsten and waste tungsten imported from abroad. 



 

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Until the end of 2006, there are 53 Tungsten Mine Enterprises in Ganzhou. The yearly ore mining capacity is 6 million tons and ore processing capacity 5 million tons. Ganzhou has supplied about 1.2 million tons of tungsten concentrate since 1949, which is 49% of the total output in China. From 1980s, the recovery of tungsten mines has been improved a lot by importing new technologies. In 2006, the recovery value was about 1 billion RMB, which is 10% of the total value of Tungsten mine. Ecological environment in tungsten mines has been improved a lot by comprehensive treatment.

Ganzhou employs policies of mining tungsten strictly controlled by national mining quota. The output of tungsten concentrate has decreased 20% since 2000. Meanwhile, 2/3 of tungsten concentrate in China is processed in Ganzhou. 4,000 tons of tungsten raw material are supplied from abroad every year.



 

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Nanling Mountain and Luoxiao Mountain join up in Ganzhou. The eastern part of Nanling metallogenitic belt is in Ganzhou, which is one of the most important tungsten metallogentic belts in China. This unique and complex geological structure makes Ganzhou a famous area of tungsten resources in the world, reserves106 mining areas and more than 30%of total reserves of China.

Tungsten reserves in Ganzhou are characterized by concentrated reserves, various kings of ore deposits, high quality ore, many associated minerals. From stratigraphical analysis the average tungsten content in stratum of Ganzhou is 9.53ppm, somewhere more than 12ppm. This is more than 7 times over the world average value of 1.3 ppm. Ore deposit forms include quartz-cassiterite vein, stratiform vein ,meta-sand rock etc. Among them quartz cassiterite vein with its deposit scale and reserve volume ,is the largest one in China or even in the world .As main kind of tungsten ore , wolfamite of high quality is with high grade and easy to dress. The recovery of dressing is generally more than 85%.The associated minerals of tungsten ore deposits: tin, molybdenum, bismuth, copper, lead, zinc, silver and beryllium, niobium, tantalum, rare earth, lithium, crystal, fluorite and so on ,could be all recovered and made use of .

Based on the regularity of tungsten ore formation and special geologic structure in Ganzhou, geologists have found the so called ‘5-layer structure ’and ‘7-layer structure ’model for the vein type tungsten deposits,especially for wolframite. This means that from surface to depth of earth stratum the vein gets larger and the vein type changes in order of ‘mark belt made of super fine linear veins –fine veins belt –fine and thin veins mixed belt –thin veins belt –large veins belt’. These models have played an important role in research and development of geological survey and mining. It is forecasted that in the next 5 years the tungsten reserves newly found in Ganzhou will be 2 times of the reserves today .Tungsten resources in Ganzhou are sure to have huge potential and bright future.

 

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Forging is a main machining process to produce tungsten radiation shielding.Tungsten and several tungsten alloys have been successfully forged over a wide range of temperatures from as low as 1800 to 3500F. In rocket nozzle forging, a billet height reduction of approximately 80% at forging temperatures below the critical recrystallization temperature is considered essential. This imparts the fine-grained, fully wrought, fibrous structure that is characteristic of high strength and good ductility at low transition temperatures.

Tungsten is generally forged in the hot-cold work temperature range where hardness and strength increase with increasing reductions. Both systems exhibit increase forgeability with decreasing grain size. The greatest use of tungsten forgings has been in rocket nozzle applications. Production forging of tungsten nozzle inserts has been largely limited to billets prepared by powder metallurgy techniques because of their earlier availability than cast tungsten.

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