Recovery of Tungsten from a Gold Tailings in Western Henan Province by Flotation-Roasting Magnetic Separation Process
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摘要:
针对豫西某金尾矿中钨初步富集后品位难以提高的问题,从工艺矿物学角度出发,查明了影响钨提纯的主要原因,并据此开展了详细的钨精选试验研究。结果表明:(1)钨粗精矿中主要矿物为白钨矿、重晶石、碳酸盐,其可浮性相近,同时含有细粒嵌布的黄铁矿等,使得钨精矿品位较低,杂质硫元素含量高;(2)根据矿石性质,工艺采用"彼得洛夫法"加温精选除去碳酸盐矿物,调浆至酸性条件下浮选除去重晶石矿物,焙烧磁选工艺除去细粒嵌布黄铁矿,最终获得了白钨精矿WO3品位69.53%、回收率86.27%的选别指标。试验结果为该地区同类型尾矿资源综合利用提供了依据。
Abstract:In view of the difficulty in improving the grade of tungsten after preliminary enrichment in a gold tailings in Western Henan Province, the main factors affecting tungsten purification were identified from the point of process mineralogy, and a detailed experimental study on tungsten cleaning test was carried out accordingly. The results showed that the main minerals in tungsten concentrate were scheelite, barite and carbonate, which had similar floatability. Duo to the contained fine-grained pyrite, tungsten concentrate had low grade and high content of impurity sulfur. According to the nature of the ore, the tungsten concentrate WO3 grade of 69.53% and the recovery of 86.27% was finally obtained under the process of fine-grained pyrite removed by calcined magnetic separation, the barite minerals removed by flotation under acidic conditions and the carbonate minerals removed by the heating cleaning test with the method of "Petrov method". It provided a basis for the comprehensive utilization of the same type of tailings resources in this area.
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表 1 现场钨粗精矿多元素分析结果
Table 1. Multi-element analysis results of tungsten rough concentrate
元素 Au* S WO3 BaO CO32- Fe2O3 SiO2 Al2O3 CaO MgO 含量/% 0.53 1.78 4.25 5.06 22.88 15.17 28.33 4.08 13.82 2.87 *注:单位为g/t。 表 2 现场钨粗精矿钨物相分析结果
Table 2. Phase analysis of tungsten rough concentrate
相别 白钨矿中的钨 黑钨矿中的钨 其它 合计 含量/% 4.03 0.18 0.04 4.25 分布率/% 94.82 4.24 0.94 100.00 表 3 钨粗精矿的主要矿物组成 /%
Table 3. Mineral composition of tungsten rough concentrate
白钨矿 方解石 白云石 重晶石 石英 白云母 褐铁矿 黑钨矿 磷灰石 绿泥石 黄铁矿 黄铜矿 磁黄铁矿 菱锶矿 5.50 17.50 13.22 7.67 20.88 13.23 12.81 0.26 1.26 2.34 3.20 少量 少量 少量 表 4 钨粗精矿加温精选闭路试验结果
Table 4. Closed circuit heating cleaning results of tungsten rough concentrate
产品名称 产率/% 品位/% 回收率/% WO3 BaO WO3 BaO 加温精矿 20.05 20.36 28.61 96.78 97.55 加温精尾 79.95 0.170 0.180 3.22 2.45 合计 100.00 4.22 5.88 100.00 100.00 表 5 加温浮选钨精矿矿物检测结果
Table 5. Testing results of tungsten concentrate by heating flotation
矿物 重晶石 白钨矿 磷灰石 黄铁矿 菱锶矿 石英 黄铜矿 磁黄铁矿 含量/% 47.18 25.27 7.71 4.39 2.65 1.69 1.36 1.14 表 6 钨钡分离精选试验结果
Table 6. Cleaning test results of separation of scheelite-barite
产品名称 作业产率/% 品位/% 作业回收率/% WO3 BaO WO3 BaO 钨精矿 36.02 51.62 4.29 89.21 5.41 精尾 63.98 3.52 42.26 10.79 94.59 合计 100.00 20.85 28.59 100.00 100.00 表 7 焙烧脱硫—磁选除铁试验结果
Table 7. Test results of roasting desulfurization-magnetic separation
产品 产率/% 品位/% 回收率/% WO3 BaO WO3 BaO 分离钨精矿 7.22 51.62 4.29 86.34 5.28 焙烧后 6.26 57.44 / 86.34 5.28 二氧化硫 0.96 / / / / 磁选后 4.92 69.53 7.34 86.27 5.26 磁性铁 1.34 / / / / -