镜铁山Ⅴ矿体铁矿石智能与强磁干式联合预选试验研究

Experimental Research on the Intelligent and High Magnetic Dry Combined Pre-selection forⅤOrebody Iron Ore in Jingtieshan

酒钢镜铁山Ⅴ矿体铁矿石采出TFe品位23%左右,多年来受选矿工艺技术水平及经济条件制约,一直未得到合理利用。现场采用单一强磁预选工艺,入选矿石TFe品位得到较为明显的提高,但尾矿TFe品位偏高,铁损失较大。为进一步提高预选效果,对该矿进行智能预选与强磁预选联合抛废试验研究。结果表明:①对于TFe品位为23.92%、粒度范围为15~45 mm粒级样,适宜的抛废率为16.31%,此时TFe品位为26.53%、回收率92.83%。抛废率为13.20%和20.39%的稳定试验结果与条件试验结果基本一致,表明智能预选试验数据可靠。②A1粒级样(30~45 mm)粗选适宜的筒体表面线速度为0.70 m/s,此时精矿TFe品位为29.03%、回收率70.91%;A2粒级样(15~30 mm)粗选适宜的筒体表面线速度为0.85 m/s,此时精矿TFe品位为30.03%、回收率78.09%。③粒度为30~45 mm的智能预选精矿通过强磁干式预选,可抛除作业产率为15.04%、TFe作业回收率为8.29%的尾矿,精矿TFe品位提升了2.04个百分点;粒度为15~30 mm的智能预选精矿通过强磁干式预选,可抛除作业产率为10.97%、TFe作业回收率为5.79%的尾矿,精矿TFe品位提升了1.54个百分点。粒度为30~45 mm的智能预选精矿的强磁干式预选效果更好。④采用智能预选—强磁干式预选(1粗1扫)工艺进行联合抛废处理15~45 mm粒级矿样,可抛除总产率为24.12%、TFe回收率为11.95%的尾矿,精矿TFe品位提升了3.85个百分点,预选效果较好。

The TFe grade of iron ore produced from Jingtieshan Ⅴ ore body of Jiusteel is about 23%.Due to the restriction of the technical level and economic conditions of mineral processing for many years,it has not been rationally utilized.The TFe grade of the selected ore is significantly improved by the single high intensity magnetic pre-selection process,but the TFe grade of the tailings is high and the iron loss is large.In order to further improve the effect of pre-selection,the combined discarding test of intelligent pre-selection and high intensity magnetic pre-selection was carried out.The results showed that:①For the samples with TFe grade of 23.92%and particle size of 15~45 mm,the optimal discarding rate was 16.31%with TFe grade of 26.53%and recovery rate of 92.83%.The stability test results of discarding rate of 13.20%and 20.39%are basically consistent with the conditional test results,indicating the reliability of intelligent pre-selection test data.②The suitable linear velocity of barrel surface in roughing for A1 sample(30~45 mm)was 0.70 m/s with TFe grade of 29.03%and recovery rate of 70.91%in concentrate.The suitable linear velocity on the surface of barrel in roughing for A2 sample(15~30 mm)was 0.85 m/s with TFe grade of 30.03%and recovery rate of 78.09%in concentrate.③The intelligent pre-selection concentrate with particle size of 30~45 mm could remove tailings with yield of 15.04%and recovery rate of 8.29%by high intensity dry pre-selection,and TFe grade of concentrate increases by 2.04 percentage points.The intelligent pre-selection concentrate with particle size of 15~30 mm could remove tailings with yield of 10.97%and recovery rate of 5.79%by high intensity dry pre-selection,and TFe grade of concentrate increases by 1.54 percentage points.The intelligent pre-selection concentrate with particle size of 30~45 mm has better effect in high intensity dry pre-selection.④The process of intelligent pre-selection and high intensity dry pre-selection(one roughing and one scavenging)was used to treat tailings with the particle size of 15~45 mm,and the tailings with the total yield of 24.12%and TFe recovery rate of 11.95%could be discarded.The TFe grade of concentrate was improved by 3.85 percentage points,indicating the better pre-selection effect.