四川宁南鲕状赤铁矿选矿试验研究

发布时间：2018-04-10 23:20

  本文选题：工艺矿物学 + 常规选矿　； 参考：《昆明理工大学》2015年硕士论文

【摘要】：鲕状赤铁矿目前尚属难选矿石,主要表现在生产工艺复杂,铁精矿品位很难达到冶炼要求,且生产成本高,因此到现在基本上还没有厂家对其开发利用。但随着铁矿石资源的短缺,加上各自矿山服务年限越来越少,目前国内各个矿山都纷纷占有资源,组织各科研院所对鲕状赤铁矿的可选性作了大量的研究。本论文对宁南华弹鲕状赤铁矿进行了化学多元素分析、物相分析、粒度组成等工艺矿物学研究,结果表明,区内矿石属低磷、低硫的单一半自熔性宁乡式鲕状赤铁矿矿石。矿石中铁的赋存状态较为简单,以高价氧化铁的形式分布在赤(褐)铁矿中的铁高达96.07%嵌布粒度统计结果显示,矿石中赤铁矿鲕粒具中粗粒嵌布的特点。如果将赤铁矿鲕粒作为选矿的基本单元,那么在-0.59mm的磨矿细度条件下,95%左右的赤铁矿鲕粒均可呈单体产出。矿石经还原焙烧后,大部分赤铁矿已转化为磁铁矿,但其集合体仍保留了原矿石中赤铁矿鲕粒的基本特征,磁铁矿与脉石矿物仍然多呈环带状相间排列,而且在部分矿粒中尚见形态各异的赤铁矿呈交代残余零星分布。在工艺矿物学研究的基础上,本论文对宁南华弹鲕状赤铁矿进行了选矿试验研究。探索性试验采用了常规选矿试验,结果表明,原矿直接采用强磁选、强磁选-反浮选等机械物料选矿流程难以得到TFe57%以上的铁精矿。为此进一步采用焙烧-磁选等化学选矿方法进行研究,最终结果表明焙烧-磁选-反浮选全流程试验方案可行。并对产品进行了产品检查,产品沉降过滤试验,尾矿废水水质分析。结合该矿石的性质、类型、特点,在工艺矿物学研究的基础上,通过多方案比较和各种工艺参数详细的条件试验,推荐原矿采用还原磁化焙烧—弱磁选—阴离子反浮选流程作为该鲕状赤铁矿选矿的原则流程,在还原气氛(外加本地2#煤10%)条件下,控制焙烧温度750℃左右,焙烧时间不低于90min(焙烧时间越长,磁化率越高,焙烧效果越好,铁精矿回收率相应越高),水冷出炉,可以获得比较优质的磁化焙烧矿,在焙烧矿磨矿细度-0.043mm(-325目)粒级含量占91.26%的条件下,原矿采用还原磁化焙烧-弱磁选(磁场强度1200 Oe)流程,可得产率61.54%、品位TFe55.52%、回收率80.94%的弱磁精矿；在弱磁精矿磨矿细度-0.043mm粒级含量占90.07%的条件下,原矿采用还原磁化焙烧-弱磁选(磁场强度2000 Oe)-阴离子反浮选流程,可得铁精矿产率60.64%、品位TFe57.22%、回收率82.20%,铁精矿品位、回收率均比较高,方案可行。
[Abstract]:Oolitic hematite is still a refractory ore at present, which is mainly manifested in the complex production process, the iron concentrate grade is difficult to meet the smelting requirements, and the production cost is high.However, with the shortage of iron ore resources and the shortage of mine service life, each mine in China occupies resources one after another at present, and many research institutes have been organized to study the selectivity of oolitic hematite ore.In this paper, the chemical multielement analysis, phase analysis and granularity composition of the oolitic hematite were studied. The results show that the ore in the area is a single semi-self-fluxing Ningxiang oolitic hematite with low phosphorus and low sulfur.The occurrence state of iron in ore is relatively simple. The distribution of iron in red (brown) iron ore in the form of high valence iron oxide is as high as 96.07% of the inlay granularity. The statistical results show that the hematite oolitic particles in the ore have the characteristics of medium and coarse grain intercalation.If hematite oolitic particles are taken as the basic unit of ore dressing, 95% hematite oolitic particles can be produced as monomers under the grinding fineness of -0.59 mm.After the reduction roasting, most hematite has been transformed into magnetite, but its aggregates still retain the basic characteristics of hematite oolitic particles in the original ore, and the magnetite and gangue minerals are still arranged in annular bands.In addition, hematite with different shapes is distributed sporadically in some ore grains.On the basis of technological mineralogy research, this paper has carried on the ore dressing experiment research to the Ningnan Hua slug oolitic hematite.The results show that it is difficult to obtain more than 57% iron concentrate from raw ore by means of high magnetic separation and high magnetic separation and reverse flotation.For this reason, the roasting magnetic separation and other chemical dressing methods are adopted to further study, and the final results show that the whole process test scheme of roasting magnetic separation and reverse flotation is feasible.Product inspection, product sedimentation and filtration test, tailings waste water quality analysis were also carried out.Combined with the properties, types and characteristics of the ore, on the basis of the study of process mineralogy, through the comparison of various schemes and detailed conditional tests of various technological parameters,It is recommended that the process of reduction magnetization roasting, weak magnetic separation and anion reverse flotation should be used as the principle process of this oolitic hematite dressing. Under the condition of reducing atmosphere (plus local coal 10), the calcination temperature is controlled at 750 鈩，

本文编号：1733389