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美国阿拉斯加大学矿物工业研究实验室(MIRL)对复合水力旋流器回收细粒金和白钨矿的有效性,进行了研究。本文所研究的细粒金均小于40微米并呈游离态。由于这种金粒的形状系数较低,因而,用适于选别较粗粒级的提金溜槽回收效果不好。本文介绍了 MIRL 关于复合水力旋流器以往和目前的研究工作.初始试验采用一台直径为70毫米的硼硅酸玻璃旋流器,回收阿拉斯加中部地区砂金矿砂内赋存的游离金.由于试验结果理想,又组装了一套半工业型试验装置进行下步实验室和现场试验。该装置有二台100毫米的复合水力旋流器、一台100毫米浓缩旋流器、一台50毫米的矿浆泵及泵池,该装置拆卸和运输均比较方便。采用该装置进行了不同入选物料单段选别的实验室试验。入选物料为含金海滨砂以及由粒度已知的金粒与贫海滨砂组成的人工混合料.试验目的在于确定适用于现场试验的复合水力旋流器的工作参数。1983年6月,这套装置运至阿拉斯加州的 Circle 采区一座砂金矿,采用一段选别,处理粒度小于20目(840微米)的溜槽尾矿,小时处理量为0.8吨,在选矿比为13∶1时,游离金的回收率达到92%。1984年也作过类似这方面的试验,选别小于3毫米的溜槽尾矿,试验表明溜槽的金损失量为28毫克/米~3.对粒度为-14目的白钨矿试验表明,脱除了大量的轻脉石物料,复合水力旋流器可有效地富集粗粒级重矿物.有待继续试验研究的是用复合水力旋流器回收细粒金时,颗粒的形状系数和粒度对选别的影响。
The University of Alaska Mineral Industries Research Laboratory (MIRL) studied the effectiveness of composite hydrocyclones in the recovery of fine grained and scheelite. The fine grained gold studied in this paper are all less than 40 microns and are in free state. Due to the low form factor of such gold particles, the recovery with a gold gatter suitable for sorting of coarse fractions is not effective. This article describes the previous and current work of MIRL on a composite hydrocyclone that initially recovered 70 grams of free gold in sand from gold ore in central Alaska using a 70 mm diameter borosilicate glass cyclone The result was good and a set of semi-industrial test setups were assembled for further laboratory and field testing. The unit has two 100 mm composite hydrocyclones, a 100 mm concentrated cyclone, a 50 mm slurry pump and a pump cell, which are easy to disassemble and transport. The device was used for different selected materials in a single section of the laboratory test. The selected materials are gold-bearing seashore sand and artificial mixtures of gold particles and leftover sand with known grain sizes.The purpose of the test is to determine the operating parameters of a composite hydrocyclone suitable for field testing. In June 1983, the unit was shipped to a sand gold mine in the Circle mining area of Alaska using a sorting process for chute tailings of less than 20 meshes (840 microns) with an hourly throughput of 0.8 tons. At 13: 1, the recovery of free gold reached 92%. Similar experiments in this area were also conducted in 1984 to select chute tailings less than 3 mm. The tests showed that the chrome loss was 28 mg / m ~ 3. The scheelite test with a particle size of -14 showed that the A large number of light-gravel materials and composite hydrocyclones can effectively enrich the coarse-grained heavy minerals.What needs to be further studied is when the composite hydrocyclone is used to recover the fine grained gold particles, the shape factor and particle size of the particles Impact.