为了合理开发利用广东某高硫铁矿石,针对铁精矿硫含量超标难以销售的问题,在矿石性质研究的基础上,进行了阶段磨矿—阶段磁选、浮选—磁选—浮选、磁选—浮选—磁选3种工艺方案的对比探索试验。试验结果表明:磁选—浮选—磁选工艺对该...为了合理开发利用广东某高硫铁矿石,针对铁精矿硫含量超标难以销售的问题,在矿石性质研究的基础上,进行了阶段磨矿—阶段磁选、浮选—磁选—浮选、磁选—浮选—磁选3种工艺方案的对比探索试验。试验结果表明:磁选—浮选—磁选工艺对该高硫铁矿石的脱硫效果最好,在一段磨矿细度为-0.074 mm 65%,磁场强度为80 kA/m的条件下进行弱磁选,可得到磁性产品和非磁性产品;将磁性产品再磨至-0.045 mm 90%,固定新型活化剂X用量3000 g/t,捕收剂丁基黄药用量90 g/t,起泡剂2^(#)油用量60 g/t,通过1粗1扫反浮选脱除硫铁矿,扫选尾矿在磁场强度为80 kA/m的条件下进行弱磁选,最终获得了铁品位64.88%、含硫0.42%、全铁回收率50.68%的合格铁精矿。展开更多
In this research, a vermicular graphite cast iron brake drum was produced by cored wire injection in a one-step method. Silica sand and low-density alumina-silicate ceramic were used as molding materials in order to i...In this research, a vermicular graphite cast iron brake drum was produced by cored wire injection in a one-step method. Silica sand and low-density alumina-silicate ceramic were used as molding materials in order to investigate the effect of cooling rate on percentage of vermicular graphite and mechanical properties of the brake drum casting. Several thermocouples were inserted into the casting in the desired positions to measure the temperature change. By means of one-step cored wire injection, the two residual concentrations of Mg and RE were effectively controlled in the ranges of 0.013%-0.017% and 0.019%-0.025%, respectively, which are crucial for the production of vermicular graphite cast iron and the formation of vermicular graphite. In addition, the cooling rate had a significant effect on the vermicular graphite percentage. In the case of the silica mold brake drum casting, there was an obvious difference in the cooling rate with the wall change, leading to a change in vermicular graphite percentage from 70.8% to 90%. In the low-density alumina-silicate ceramic mold casting, no obvious change in temperature was detected by the thermocouples and the percentage of the vermicular graphite was stable at 85%. Therefore, the vermicular graphite cast iron brake drum with a better combination of mechanical properties could be obtained.展开更多
文摘为了合理开发利用广东某高硫铁矿石,针对铁精矿硫含量超标难以销售的问题,在矿石性质研究的基础上,进行了阶段磨矿—阶段磁选、浮选—磁选—浮选、磁选—浮选—磁选3种工艺方案的对比探索试验。试验结果表明:磁选—浮选—磁选工艺对该高硫铁矿石的脱硫效果最好,在一段磨矿细度为-0.074 mm 65%,磁场强度为80 kA/m的条件下进行弱磁选,可得到磁性产品和非磁性产品;将磁性产品再磨至-0.045 mm 90%,固定新型活化剂X用量3000 g/t,捕收剂丁基黄药用量90 g/t,起泡剂2^(#)油用量60 g/t,通过1粗1扫反浮选脱除硫铁矿,扫选尾矿在磁场强度为80 kA/m的条件下进行弱磁选,最终获得了铁品位64.88%、含硫0.42%、全铁回收率50.68%的合格铁精矿。
基金financially supported by the Foundation of Heilongjiang Educational Committee(Grant No.12531116)the Harbin Special Funds for Creative Talents in Science and Technology(Grant No.2013RFQXJ102)
文摘In this research, a vermicular graphite cast iron brake drum was produced by cored wire injection in a one-step method. Silica sand and low-density alumina-silicate ceramic were used as molding materials in order to investigate the effect of cooling rate on percentage of vermicular graphite and mechanical properties of the brake drum casting. Several thermocouples were inserted into the casting in the desired positions to measure the temperature change. By means of one-step cored wire injection, the two residual concentrations of Mg and RE were effectively controlled in the ranges of 0.013%-0.017% and 0.019%-0.025%, respectively, which are crucial for the production of vermicular graphite cast iron and the formation of vermicular graphite. In addition, the cooling rate had a significant effect on the vermicular graphite percentage. In the case of the silica mold brake drum casting, there was an obvious difference in the cooling rate with the wall change, leading to a change in vermicular graphite percentage from 70.8% to 90%. In the low-density alumina-silicate ceramic mold casting, no obvious change in temperature was detected by the thermocouples and the percentage of the vermicular graphite was stable at 85%. Therefore, the vermicular graphite cast iron brake drum with a better combination of mechanical properties could be obtained.
