Tungsten, Molybdenum metal plurality Ores (processing of complex ore co ntaining tungsten , molybdenum and bismuIth) The process of separating and enriching tungsten minerals, molybdenum minerals and niobium minerals from tungsten-containing molybdenum-niobium polymetallic ores. Mineral processing products include tungsten concentrate, molybdenum concentrate and antimony concentrate. Tungsten-molybdenum-bismuth polymetallic ore is a famous mineral in China. It is mainly distributed in the Yinzhou area of ​​Hunan Province, and its Shizhuyuan mining area is a very large deposit. Major industrial mineral ore scheelite, wolframite, molybdenite, bismuthinite, cassiterite, fluorite, pyrite and the like. (See table) Although there are many useful ingredients in the ore, Recycling scheelite is the main process. The beneficiation process uses flotation by flotation method to recover scheelite. Re-selection, magnetic separation, flotation or re-selection, flotation, magnetic separation, flotation, combined process, comprehensive recovery Tungsten ore, wolframite, molybdenite, stibnite, etc. The flotation reagents used are sodium carbonate, water glass, oxidized paraffin soap, No. 2 oil, sulfur nitrogen No. 9, sodium sulfide, lime, sodium hydroxide and the like. The mine 'Shijiao three sections and a closed circuit crushing process are broken and fed into the mill. Grinding fineness is 85% to 200 mesh. The molybdenum is first floated to obtain a mixed concentrate, and then the molybdenum crucible is separated and floated to obtain a molybdenum concentrate and a cerium concentrate. The molybdenum rhodium floatation tailings are subjected to bismuth sulfur flotation, and the obtained foam products are separated and floated to obtain bismuth concentrate and bismuth concentrate. The sulphur flotation tailings float flotation scheelite, the obtained foam product is heated and selected to obtain scheelite concentrate, and the selected tailings are recovered by a shaker to obtain black tungsten concentrate. The ore grades selected in 1992 were: WO 30.6%; Mo 0.12%; Bi 0.19%. The production index is: molybdenum concentrate containing 48.6% Mo, leaching efficiency 86.29%; antimony concentrate containing Bi 46.59%, the actual recovery rate is 63.22%; tungsten concentrate containing WO366.83%, the actual recovery rate is 58.66%.
LED Packages
LED (semiconductor light-emitting diode) packaging refers to the packaging of light-emitting chips, which is quite different from integrated circuit packaging. The packaging of the LED is not only required to be able to protect the wick, but also to be able to transmit light. Therefore, LED packaging has special requirements for packaging materials.
Generally speaking, the function of the package is to provide sufficient protection for the chip to prevent long-term exposure or mechanical damage to the chip in the air to improve the stability of the chip; for the LED package, it also needs to have good light extraction efficiency and good heat dissipation. , A good package can make the LED have better luminous efficiency and heat dissipation environment, and then improve the life of the LED.
1. Expand the crystal, open the densely arranged chips a little bit to facilitate the crystal bonding. Led Packages,White Led Package,Useful Led Package,Custom Ceramic Substrate Bingri Electronic Technology (Shenzhen) Co., Ltd. , https://www.bingriuvled.com
2. Die-bonding, point conductive/non-conductive glue on the bottom of the holder (conductivity depends on whether the chip is a top-bottom PN junction or a left-right PN junction) and then put the chip into the holder.
3. Short bake, so that the chip does not move when the glue cures the bonding wire.
4. Wire bonding, use gold wire to connect the chip and the support.
5. Pre-test, preliminary test whether it can be bright.
6. Fill the glue and wrap the chip and the bracket with glue.
7. Bake for a long time to allow the glue to solidify.
8. Post-test, test whether it can be bright or not and whether the electrical parameters meet the standard.
9. Light and color separation to separate products with roughly the same color and voltage.
10. Packaging.