A Study for Improvement of the Separation Results of Rare Metal Minerals Which are Difficult to Separate

得到的主要结果如下：(1)所调查的独居石和xenatimonazite的浮选分离样品主要来自澳大利亚、马来西亚、泰国和美国。)，而xenotime样本则来自马来西亚。在溶液pH = 7时，以十二烷基氯化铵（DAC）为捕收剂，这些独居石样品的浮选回收率有显著差异；泰国样本的数值为90%，马来西亚为70%，美国为51%，澳大利亚为8%。在相同条件下，xenotime样品的浮选回收率为14%。在pH值为3的条件下，十二烷基硫酸钠（SDS）的浮选回收率分别为美国样品的51%，澳大利亚样品的35%，马来西亚样品的11%，泰国样品的0%，xenotime样品的17%。研究发现，FeCl_3的加入大大提高了SDS捕收剂对独居石的浮选效果，如马来西亚独居石的浮选率达82%。(2)铜钨矿和黑钨矿的浮选分选：在15 kOe的磁场下，日本柱钨矿和葡萄牙黑钨矿的磁化率分别为0.63 emu/g和0.68 emu/g，表明磁选不适合这两种矿物的分选。在pH值为3的条件下，以油酸钠为捕收剂，浮选回收率分别为柱石的68%和黑钨矿的9%。然后，通过结合后续的清洗和清除过程，期望有效的分离。

Followigs are the main results obtained.(1) Flotation separation of monazite and xenatimeMonazite samples investigated are from Australia, Malaysia, Thailand and America(U. S.), and xenotime sample is from Malaysia.Remarkable difference has been observed in terms of flotation recovery among these monazite samples, using dodecylammonium chloride (DAC) as collector at the solution pH of 7 ; the values are 90 % of Thai sample, 70 % of Malaysian, 51 % of American and 8 % of Australian. Flotation recovery of the xenotime sample is 14 % under the same conditions. Using sodium dodecylsulfate (SDS) at pH 3, the flotation recoveries are 51 % of American sample, 35 % of Australian, 11 % of Malaysian and 0 % of Thai for monazite, and 17 % for the xenotime. It has been found that the addition of FeCl_3 greatly increased the flotation of monazites using SDS as collector, for example 82 % of flotation was achieved for the Malaysian monazite.(2) Flotation separation of colulubibe and wolframiteMagnetizations of Japanese columbite and Portuguese wolframite are 0.63 emu/g and 0.68 emu/g, respectively, in the magnetic field of 15 kOe, indicating that magnetic separation is not suitable for the separation of these minerals. Flotation recoveries of these minerals are 68 % of the columbite and 9 % of the wolframite, using sodium oleate as collector at pH 3. Then, the effective separation is expected by combining subsequent cleaning and scavenging processes.