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福建省宁德地区科委1985年5月17至18日在福州市召开会议,对中南矿冶学院和闽东选矿设备制造公司共同研制的BTL(玻璃钢塔形溜槽)型螺旋溜槽进行技术鉴定。该机的原型(LTL-3型)是中南矿冶学院于1979年研制的,样机制成后曾经对攀枝花红格矿北矿区的钒钛铁矿石、锡矿山锑矿及其北选厂的浮选尾矿等矿样进行
Ningde Prefecture Science and Technology Commission held a meeting in Fuzhou from May 17 to May 18, 1985 to carry out technical appraisal on the BTL (fiberglass tower chute) spiral chute co-developed by Zhongnan Mining and Metallurgical Institute and Mindong Mineral Processing Equipment Manufacturing Company. Prototype (LTL-3) of the aircraft was developed by Zhongnan Mining and Metallurgy Institute in 1979. After the prototype was made, the prototype of vanadium-titanium-iron ore, tin mine antimony mine and its north processing plant in Pangebei Minefield, Panzhihua, Flotation tailings and other mineral samples