鲕状赤铁矿降磷降铝工艺与机理研究
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摘要
钢铁工业是国民经济的重要基础产业,随着国民经济的快速增长,冶金技术得到了长足的发展,对铁精矿质量的要求也越来越高。同时国内铁矿石供应已不能满足我国钢铁工业发展的需要,导致我国对进口铁矿石的依赖度显著增加,国际铁矿石价格快速攀升。为了保证我国钢铁行业的稳定持续发展,迫切需要对国内现有铁矿资源进行充分开发利用,尤其是目前受到技术限制而没有被开发利用的铁矿石,高磷鲕状赤铁矿就是其中重要的一部分。
赫章铁矿为低品位鲕状赤铁矿,通过化学多元素分析和矿物学分析可知,该矿石性质复杂,除硅之外,磷和铝含量也较高。针对以上特点,本文采用焙烧-磁选-反浮选和直接还原-磁选工艺对其进行试验研究,以期达到提高铁品位同时降低磷含量和铝含量的目标。
焙烧-磁选-反浮选试验研究表明:该矿石的最优焙烧条件为焙烧温度750℃,还原剂用量9%,焙烧时间80min;适宜磁选条件为将焙烧后矿石磨矿至-0.043mm占93.31%,磁选磁场强度200kA/m;磁选精矿再磨后进行反浮选,矿浆pH值为11,抑制剂淀粉用量为1750g/t,活化剂氧化钙用量800g/t,捕收剂R1B用量800g/t。通过焙烧-磁选-反浮选工艺,可以获得铁品位55.47%,磷含量为0.44%,铝含量为6.94%,铁回收率78.34%的铁精矿。
红外光谱分析表明,试验中使用的改性油酸和捕收剂R1B主要由烃基和羧基组成。两种捕收剂均可在浮选尾矿表面发生化学吸附,相同条件下捕收剂R1B在尾矿表面的化学吸附能力比改性油酸强。
根据赫章地区铁矿资源特点,对该地区赤铁矿和菱铁矿进行混合试验表明,赤铁矿与菱铁矿混合为6:4,焙烧温度750℃,还原剂用量8%,焙烧时间80min,焙烧后磨矿至-0.043mm占90%,以200kA/m磁场强度进行磁选,可以获得精矿铁品位58.87%,磷含量0.29%,铝含量5.21%,铁回收率为87.69%的铁精矿。
通过直接还原-磁选试验研究,得到该赤铁矿的最佳还原条件为:还原温度1150℃,还原剂用量为50%,还原碱度0.6,还原时间120min;再将直接还原矿石磨矿至-0.043mm占92.18%,以150kA/m磁选磁场强度进行磁选。通过直接还原-磁选工艺,可以获得铁品位72.75%,磷含量为0.43%,铝含量为6.14%,铁回收率达到92.04%的铁精矿。
The steel industry is an important basic industry of national economy, with the rapid growth of the national economy, metallurgical technology has a great development,the quality of iron concentrates on higher requirements. While domestic iron ore supply can not meet the needs of the development of steel industry, the dependence on imported iron ore significantly increased,and the international iron ore prices rose rapidly. In order to ensure the stable and sustainable development of steel industry, the exploitation of existing domestic iron ore resources is urgent need, especially the iron ore without development that being limited by technical now, high phosphorus oolitic hematite is an important part of it.
Hezhang iron ore is low grade oolitic hematite, the rearch result shows that the properties of the ore are complex, and the contents of phosphorus and aluminium are higher as well as silicon by using chemical component analysis and mineralogy analysis. In view of the above characteristics, in this paper the roasting-magnetic separation-reverse flotation and direct reduction-magnetic separation technology were utilized in order to improve the grade of iron and reduce the contents of phosphorus and aluminum.
The results of roasting-magnetic separation-reverse flotation show that the optimum conditions of roasting and magnetic separation are roasting temperature 750℃, the dosage of reductant 9%, roasting time 80min,grind granularity -0.043mm about 93.31%, magnetic field intensity 200kA/m, respectively.Reverse flotation based on regrinding of magnetic separation concentrate was carried out under the condition of pH 11,the dosage of depressor 1750g/t, activator 800g/t, collector R1B 800g/t. Through the above method, the grade of iron concentrate 55.47% with 78.34% recovery were obtained, as well as the content of 0.44% phosphorus and 6.94% aluminum, respectively. Infrared spectrum analysis shows that modified oleic acid and collector R1B mainly composed by hydroxyl and carboxyl. Two kinds of collectors can occur chemical adsorption on the surface of the tailings and in the same conditions chemical adsorption ability of collector R1B is stronger than modified oleic acid.
According to the iron ore resources characteristics of Hezhang, the tests of hematite and siderite mixed roasting show that when the mixed proportion of hematite and siderite is 6:4, roasting temperature 750℃, the dosage of reductant 8%, roasting time 80min,grind granularity -0.043mm about 90%, magnetic field intensity 200kA/m, the grade of iron concentrate 58.87% with 87.69% recovery were obtained, as well as the content of 0.29% phosphorus and 5.21% aluminum, respectively.
Experimental study shows that the optimum conditions of direct reduction-magnetic separation are reduction temperature 1150℃, the dosage of reductant 50%, reduction basicity 0.6, reduction time 120min, grind granularity -0.043mm about 92.18%, magnetic field intensity 150kA/m, respectively. According to this flow sheet, the grade and recovery of iron concentrate were 72.75% and 92.04% respectively, while the phosphorus grade and aluminum content were 0.43% and 6.14% respectively.
赫章铁矿为低品位鲕状赤铁矿,通过化学多元素分析和矿物学分析可知,该矿石性质复杂,除硅之外,磷和铝含量也较高。针对以上特点,本文采用焙烧-磁选-反浮选和直接还原-磁选工艺对其进行试验研究,以期达到提高铁品位同时降低磷含量和铝含量的目标。
焙烧-磁选-反浮选试验研究表明:该矿石的最优焙烧条件为焙烧温度750℃,还原剂用量9%,焙烧时间80min;适宜磁选条件为将焙烧后矿石磨矿至-0.043mm占93.31%,磁选磁场强度200kA/m;磁选精矿再磨后进行反浮选,矿浆pH值为11,抑制剂淀粉用量为1750g/t,活化剂氧化钙用量800g/t,捕收剂R1B用量800g/t。通过焙烧-磁选-反浮选工艺,可以获得铁品位55.47%,磷含量为0.44%,铝含量为6.94%,铁回收率78.34%的铁精矿。
红外光谱分析表明,试验中使用的改性油酸和捕收剂R1B主要由烃基和羧基组成。两种捕收剂均可在浮选尾矿表面发生化学吸附,相同条件下捕收剂R1B在尾矿表面的化学吸附能力比改性油酸强。
根据赫章地区铁矿资源特点,对该地区赤铁矿和菱铁矿进行混合试验表明,赤铁矿与菱铁矿混合为6:4,焙烧温度750℃,还原剂用量8%,焙烧时间80min,焙烧后磨矿至-0.043mm占90%,以200kA/m磁场强度进行磁选,可以获得精矿铁品位58.87%,磷含量0.29%,铝含量5.21%,铁回收率为87.69%的铁精矿。
通过直接还原-磁选试验研究,得到该赤铁矿的最佳还原条件为:还原温度1150℃,还原剂用量为50%,还原碱度0.6,还原时间120min;再将直接还原矿石磨矿至-0.043mm占92.18%,以150kA/m磁选磁场强度进行磁选。通过直接还原-磁选工艺,可以获得铁品位72.75%,磷含量为0.43%,铝含量为6.14%,铁回收率达到92.04%的铁精矿。
The steel industry is an important basic industry of national economy, with the rapid growth of the national economy, metallurgical technology has a great development,the quality of iron concentrates on higher requirements. While domestic iron ore supply can not meet the needs of the development of steel industry, the dependence on imported iron ore significantly increased,and the international iron ore prices rose rapidly. In order to ensure the stable and sustainable development of steel industry, the exploitation of existing domestic iron ore resources is urgent need, especially the iron ore without development that being limited by technical now, high phosphorus oolitic hematite is an important part of it.
Hezhang iron ore is low grade oolitic hematite, the rearch result shows that the properties of the ore are complex, and the contents of phosphorus and aluminium are higher as well as silicon by using chemical component analysis and mineralogy analysis. In view of the above characteristics, in this paper the roasting-magnetic separation-reverse flotation and direct reduction-magnetic separation technology were utilized in order to improve the grade of iron and reduce the contents of phosphorus and aluminum.
The results of roasting-magnetic separation-reverse flotation show that the optimum conditions of roasting and magnetic separation are roasting temperature 750℃, the dosage of reductant 9%, roasting time 80min,grind granularity -0.043mm about 93.31%, magnetic field intensity 200kA/m, respectively.Reverse flotation based on regrinding of magnetic separation concentrate was carried out under the condition of pH 11,the dosage of depressor 1750g/t, activator 800g/t, collector R1B 800g/t. Through the above method, the grade of iron concentrate 55.47% with 78.34% recovery were obtained, as well as the content of 0.44% phosphorus and 6.94% aluminum, respectively. Infrared spectrum analysis shows that modified oleic acid and collector R1B mainly composed by hydroxyl and carboxyl. Two kinds of collectors can occur chemical adsorption on the surface of the tailings and in the same conditions chemical adsorption ability of collector R1B is stronger than modified oleic acid.
According to the iron ore resources characteristics of Hezhang, the tests of hematite and siderite mixed roasting show that when the mixed proportion of hematite and siderite is 6:4, roasting temperature 750℃, the dosage of reductant 8%, roasting time 80min,grind granularity -0.043mm about 90%, magnetic field intensity 200kA/m, the grade of iron concentrate 58.87% with 87.69% recovery were obtained, as well as the content of 0.29% phosphorus and 5.21% aluminum, respectively.
Experimental study shows that the optimum conditions of direct reduction-magnetic separation are reduction temperature 1150℃, the dosage of reductant 50%, reduction basicity 0.6, reduction time 120min, grind granularity -0.043mm about 92.18%, magnetic field intensity 150kA/m, respectively. According to this flow sheet, the grade and recovery of iron concentrate were 72.75% and 92.04% respectively, while the phosphorus grade and aluminum content were 0.43% and 6.14% respectively.
引文
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