新白马公司一期钒钛铁精矿提质研究与实践

Research and Practice on Improving the Quality of Vanadium Titanium Iron Concentrate in the First Phase of New Baima Company

为将新白马公司一期的钒钛铁精矿TFe品位从53.5%提高至55%以上,开展了主要矿物工艺粒度分析、磨选试验、现场工艺流程考查、最终精矿粒度和单体解离度分析,发现一段旋流器设备性能缺陷、二段高频细筛处理能力不足、二段磨机与分级设备处理能力不匹配是制约一期钒钛铁精矿TFe品位提升的关键因素。通过使用FX840平底旋流器替代FX610锥形旋流器对一段磨矿分级系统进行优化改造,使一段磨机循环负荷提高5.74个百分点、-0.074 mm单位容积生产率从0.37 t/(m^(3)·h)提高至0.51 t/(m^(3)·h),旋流器溢流-0.074 mm含量提高3.76个百分点,一段旋流器跑粗情况得到大幅改善;采用“旋流器+高频筛”的组合分级方式对二段磨矿分级系统进行工艺流程改造,使二段磨机循环负荷提高至439.02%、-0.074 mm单位容积生产率从0.74 t/(m^(3)·h)提高至0.91 t/(m^(3)·h),高频细筛分级质效率较优化前提高3.73倍,筛下物-0.074 mm含量提高了16.22个百分点,成功地将一期钒钛铁精矿-0.074 mm含量从60%左右提升至70%以上,达到了在确保系统原矿处理量不降低的情况下,将钒钛铁精矿TFe品位从53.5%提高至55%以上的目的。

In order to improve the TFe grade of vanadium titanium iron concentrate from 53.5%to more than 55%in the first phase of New Baima Company,the main mineral process particle size analysis,grinding and separation test,field process flow inspection,final concentrate particle size and monomer dissociation degree analysis were carried out.It was found that the performance defects of the first phase cyclone equipment,the insufficient processing capacity of the second stage high-frequency fine screen,and the mismatch between the processing capacity of the second phase mill and the classification equipment were the key factors restricting the improvement of the TFe grade of the first phase vanadium titanium iron concentrate.By using FX840 flat-bottomed cyclone instead of FX610 conical cyclone to optimize the first phase grinding and classification system,the circulating load of the primary mill is increased by 5.74 percentage points,the unit volume productivity of-0.074 mm is increased from 0.37 t/(m^(3)·h)to 0.51 t/(m^(3)·h),the content of-0.074 mm overflow of cyclone is increased by 3.76 percentage points,and the rough running of first phase cyclone is greatly improved.The combined classification method of"cyclone+high-frequency screen"was used to transform the process flow of the second phase grinding and classification system.The circulating load of the second phase mill is increased to 439.02%,and the unit volume productivity of-0.074 mm is increased from 0.74 t/(m^(3)·h)to 0.91 t/(m^(3)·h).The quality efficiency of high-frequency fine screen is 3.73 times higher than that before optimization,and the content of-0.074 mm under the screen is increased by 16.22 percentage points.The content of-0.074 mm in the first phase vanadium titanium iron concentrate is successfully increased from about 60%to more than 70%.The purpose of increasing the TFe grade of vanadium titanium iron concentrate from 53.5%to more than 55%is achieved without reducing the raw ore processing capacity of the system.