微细粒磷矿石柱浮选试验研究

发布时间：2018-05-31 02:14

本文选题：中低品位磷矿石 + 浮选柱　；参考：《贵州大学》2017年硕士论文

【摘要】：随着磷矿富矿资源消耗殆尽,中低品位磷矿成为研究重点,常规浮选对中低品位磷矿石中细粒级部分回收效果一直不理想,而浮选柱是一种高效的浮选分离设备,特别对于细粒级的高效回收具有一定优势,因此,系统的研究柱浮选技术在中低品位磷矿石分选中的运用,加强细粒级中胶磷矿的回收,对改善和强化中低品位微细粒磷矿石高效浮选具有一定的研究意义和应用价值。针对贵州两个典型磷矿区微细粒嵌布的中低品位磷矿石ZGL和WBL,通过柱浮选试验考察了浮选柱结构参数和浮选药剂制度对其浮选影响,并与常规浮选试验进行对比分析,主要结论如下:(1)ZGL磷矿样中P2O5和MgO含量分别为22.88%和为6.69%,在磨矿细度-0.075 mm占81.08%,充气量0.25 m3/h,H2SO4用量18kg/t,GJBW用量0.6 kg/t条件下,采用常规浮选可获得精矿P2O5品位34.18%、P2O5回收率91.75%,MgO含量0.91%的浮选指标;WBL磷矿样中P2O5和MgO含量分别为23.95%和为7.53%,在磨矿细度-0.075 mm占73.58%,充气量0.20 m3/h,H2SO4用量为16 kg/t,GJBW用量0.6 kg/t条件下,常规浮选可获得精矿P2O5品位35.65%、P2O5回收率92.31%,MgO含量0.90%浮选指标。(2)ZGL磷矿样柱浮选试验中,调整磨矿细度-0.075 mm占88.01%,其它药剂用量相同,在入料距顶部300 mm、矿浆浓度24%、充气量600 L/h、冲洗水量140 mL/min、泡沫层厚度400 mm的条件下,可获得精矿P2O5品位为32.07%、P2O5回收率93.56%,MgO含量1.57%浮选指标;WBL磷矿在相同药剂制度下柱浮选试验,在入料距顶部为300 mm、矿浆浓度为22%、冲洗水量为130 mL/min、充气量为700 L/h、泡沫层厚度为350 mm,可获得精矿P2O5品位为35.41%、P2O5回收率92.79%,MgO含量0.92%浮选指标。(3)柱浮选中,泡沫层厚度对浮选影响较大,不同的矿样要选择不同泡沫层厚度才能获得较好的浮选效果,浮选过程中维持稳定的充气量是高效浮选的保障。采用柱浮选比常规浮选要求更细的磨矿细度。(4)柱浮选与常规浮选试验结果对比表明:ZGL矿样入选物料中+75μm粒级中P2O5品位高,-25μm粒级中MgO含量达7.21%,采用常规浮选方式回收+75μm粒级的效果更好,而对于MgO的脱除,在-25μm细粒级中柱浮选方式略好;WBL矿样入选物料各粒级中P2O5品位及MgO的含量相对较稳定,但细粒级且MgO含量较高,该部分柱浮选回收优势明显;综合而言,ZGL矿样采用常规浮选效果更好,而WBL矿样更适合采用柱浮选;入选物料各粒级分选差异是造成不同浮选方式效果差异的原因,对于较粗的粒级,常规浮选方式具有较好的效果,而柱浮选方式分选细粒级部分优势明显。
[Abstract]:With the depletion of rich phosphate ore resources, medium and low grade phosphate ore has become the focus of research. The recovery effect of fine particles in low and medium grade phosphate ores by conventional flotation has been unsatisfactory, and the flotation column is an efficient flotation separation equipment. Especially for the high efficiency recovery of fine particles, so the application of column flotation technology in the separation of low and medium grade phosphate ore is studied systematically, and the recovery of fine grained medium grade colloidal phosphate rock is strengthened. It has certain research significance and application value for improving and strengthening the high efficiency flotation of medium and low grade fine phosphate ore. In view of the ZGL and WBLs of low and medium grade phosphate ores with fine particles embedded in two typical phosphate rock areas in Guizhou, the effects of flotation column structure parameters and flotation reagent system on flotation were investigated by column flotation experiments, and the results were compared with those of conventional flotation tests. The main conclusions are as follows: the contents of P2O5 and MgO in ZGL phosphate rock samples are 22.88% and 6.69%, respectively. Under the conditions of grinding fineness -0.075 mm (81.08mm) and aeration rate of 0.25 m3 / h ~ (-1) H _ 2SO _ 4 18kg / t GJ BW 0.6 kg/t, the main conclusions are as follows: (1) the content of P2O5 and MgO in the phosphate rock samples are 22.88% and 6.69%, respectively. By conventional flotation, the P2O5 grade of concentrate is 34.18% and the recovery rate of P _ 2O _ 5 is 91.75%. The content of P2O5 and MgO in WBL phosphate sample is 23.95% and 7.53, respectively. Under the condition of grinding fineness -0.075 mm, the amount of aeration 0.20 m ~ (-3) H _ 2SO _ 4 is 16 kg / t ~ (-1) GJBW 0.6 kg/t, the content of P2O5 and MgO is 0.20 m ~ (-3) / h ~ (-1) H _ (2SO _ (4). The P2O5 grade of concentrate can be obtained by conventional flotation. The recovery rate of P _ 2O _ 5 is 92.31% and 0.90% of the flotation index is 0.90%. In the floatation test of phosphate ore, adjusting grinding fineness -0.075 mm accounts for 88.01%, and the amount of other reagents is the same. Under the conditions of 300mm from the top of feed, 24m of pulp concentration, 600L / h of aeration, 140mL / min of rinsing water and 400mm thickness of foam layer, the flotation test of wbl phosphate ore with P2O5 grade of 32.07g / P _ 2O _ 5 recoveries of 93.56mg _ 2O _ 5 and 1.57% of P2O5 content can be obtained by column flotation under the same reagent system. In the flotation column with 300mm top distance, 22mm pulp concentration, 130ml / min flushing water, 700L / h aeration volume and 350mm foam layer thickness, the recovery rate of P2O5 _ 2O _ 5 is 35.41g / g P _ 2O _ 5 recovery rate 0.92% floatation index, and the thickness of foam layer has a great influence on flotation. Different ore samples need to choose different foam layer thickness to obtain better flotation effect. Maintaining stable aeration rate in flotation process is the guarantee of high efficiency floatation. Comparing the results of grinding fineness. 4) column flotation with conventional flotation test results show that the content of MgO in 75 渭 m particles of 75 渭 m of P2O5 grade is 7.21, and the content of MgO in 25 渭 m particle grade is 7.21 in conventional flotation method by using column flotation, which requires more fine grinding fineness than that required by conventional flotation, and by comparison with the conventional flotation test, the results show that the content of MgO in 75 渭 m particles of 75 渭 m ore is high. The recovery of 75 渭 m grains is better. For the removal of MgO, the P2O5 grade and the content of MgO in each grade of WBL ore sample are relatively stable in the column flotation mode of -25 渭 m fine grained grade, but the content of MgO is higher in fine grained grade, so the recovery advantage of this part column flotation is obvious. In general, the conventional flotation method is better for ZGL ore sample, and the WBL ore sample is more suitable for column flotation. The difference of the grade separation of the selected material is the cause of the difference in the effect of different flotation methods, and for the coarse particle level, The conventional flotation method has better effect, while the column flotation method has obvious advantages in separating fine particles.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD923;TD97

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