Experimental Study on the Flotation Desulfurization of Vanadium Titanium Magnetite Concentrate in Panxi
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摘要:
攀西某钒钛磁铁精矿中的TFe、TiO2和S的品位分别为53.75%、12.55%和0.76%，铁、钛主要以钒钛磁铁矿、钛铁矿的形式赋存，硫主要以磁黄铁矿的形式赋存。磁黄铁矿单体解离度低，富连生体多。为将该钒钛磁铁精矿中的硫脱除，采用浮选工艺进行了降硫实验研究。结果表明：采用一粗四精二扫浮选闭路流程，在以硫酸为pH值调整剂，丁黄+丁铵（5∶1）为捕收剂，2#油为起泡剂，粗选用量分别为2000 g/t、300 g/t、40 g/t，粗扫选得到的硫粗精矿再磨细度-38 μm 93.33%的条件下，可以获得S品位为28.65%，S回收率59.46%的硫精矿，TFe品位为53.79%，TFe回收率为98.51%，铁精矿S品位为0.29%的铁精矿。
Abstract:Grades of Fe, TiO2 and S in the vanadium titanium magnetite concentrate in Panxi are 53.75%, 12.55% and 0.76%. Fe and Ti are mainly in the form of vanadium-titanium magnetite and ilmenite, while sulfur is mainly in the form of magnetic pyrite. In order to reduce the sulfur content of this vanadium titanium magnetite concentrate, a study on desulfurization was carried out by flotation. Results show that adopting the flotation closed circuit process with once roughing, four times cleaning and twice scavenging, the sulfur concentrate with S grade of 28.65% and S recovery of 59.46%, and iron concentrate with TFe grade of 53.79%, TFe recovery of 98.51%, S grade of 0.29 % can be obtained with the following conditions: sulfuric acid as pH regulator, butyl xanthate + ammonium butyrate (5:1) as collector, 2# oil as frother, of which the dosage were 2000 g/t, 300 g/t, 40 g/t in roughing and regrinding fineness of sulfide concentrate by roughing and scavenging was -38 μm content of 93.33 %.
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Key words:
- Iron concentrate /
- Flotation /
- Desulfurization
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表 1 试样中主要化学成分分析结果/%
Table 1. Analysis results of the main chemical composition in the sample
TFe FeO TiO2 V2O5 SiO2 CaO MgO Al2O3 K2O 53.75 33.83 12.55 0.548 3.83 1.01 3.02 4.31 <0.01 Na2O S Zn P Co Cr Cu Ni Ig 0.078 0.76 0.045 <0.005 0.020 0.017 0.011 <0.01 -1.46 
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表 2 试样中主要矿物及其含量
Table 2. Main mineral and its contents in the samples
矿物 钛磁铁矿 钛铁矿 赤铁矿 透辉石 绿泥石 磁黄铁矿 钛辉石 含量/% 80.14 3.76 3.52 2.86 2.26 2.18 1.55 矿物 拉长石 铁橄榄石 镁橄榄石 榍石 镁铝尖晶石 钙长石 硫钴矿 含量/% 1.37 0.85 0.72 0.55 0.13 0.1 0.01
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表 3 试样中硫在各个矿物中的分布
Table 3. Distribution of sulfur in each mineral in the sample
矿物 绿泥石 磁黄铁矿 硫钴矿 合计 S分布率/% 0.92 98.67 0.41 100.00
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表 4 试样中磁黄铁矿单体解离度分析结果
Table 4. Analysis results of dissociation degree of pyrrhotite in samples
名称 连生体 单体 合计 1/4 1/4~1/2 1/2~3/4 <3/4 质量分数/% 10.24 15.56 13.94 19.65 40.61 100.00
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表 5 扫选次数对试样降硫效果的影响
Table 5. Effect of scavenging times on desulfurization of the sample
扫选次数 产品 品位/% 铁精矿脱硫率/% Fe S 0 铁精矿 53.62 0.258 67.23 1 铁精矿 54.19 0.170 79.10 2 铁精矿 54.25 0.142 83.31 3 铁精矿 54.35 0.139 84.24
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表 6 精选次数实验结果
Table 6. Effect of scavenging times on desulfurization of the sample
精选次数 产品 产率/% S品位/% S回收率/% 3 硫精矿 0.97 29.44 40.69 4 硫精矿 0.89 31.34 39.81 5 硫精矿 0.82 33.04 38.63
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表 7 全流程闭路实验结果
Table 7. Test result of the whole closed-circuit process
产品名称 产率/% 品位/% 回收率/% Fe S Fe S 硫精矿 1.45 55.38 28.65 1.49 59.04 铁精矿 98.55 53.79 0.29 98.51 40.96 原矿 100.00 53.81 0.70 100.00 100.00
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