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研究了酸浸处理高磷铁矿脱磷及其影响因素.实验用鄂西鲕状高磷矿Fe的质量分数为51.7%,P的质量分数约0.5%,S的质量分数为0.34%.通过硫酸浸出,浸出矿中磷的质量分数降低至0.07%左右,而铁损只有0.18%,S的质量分数为0.35%,满足钢铁生产的要求.通过扫描电镜观察和能谱分析表征了高磷矿中磷的脱除,在实验酸度下能明显看出磷灰石溶解,而铁相基本不反应,并得到了热力学计算证明.实验确定了最佳的酸浸条件:浸出时间1 h,液固比100mL:8 g,酸度0.2 mol·L-1,振荡频率150 Hz.通过微波加热预处理,高磷铁矿中产生微裂纹,增加了矿石的比表面积,但是这并没有明显促进酸浸脱磷的进行.通过补酸的方式循环利用酸浸液处理高磷铁矿能得到较好的脱磷效果,脱磷率稳定在80%,能有效减少酸耗、保护环境.
The dephosphorization of high-phosphorus iron ore by acid leaching and its influencing factors were studied.The content of Fe in oolitic high-phosphate ore in western Hubei was 51.7%, the mass fraction of P was about 0.5% and the mass fraction of S was 0.34% Sulfuric acid leaching, leaching ore phosphorus content decreased to about 0.07%, while the iron loss of only 0.18%, S mass fraction of 0.35%, to meet the requirements of steel production. Scanning electron microscopy and energy spectrum analysis of high-phosphate The removal of phosphorus in the experimental acidity can clearly be seen apatite dissolution, while the basic iron phase does not react, and has been calculated by thermodynamic calculations.Experimental determination of the best acid leaching conditions: leaching time 1 h, liquid-solid Which is higher than 100mL: 8 g, acidity 0.2 mol·L-1 and oscillation frequency 150 Hz. Micro-cracks were formed in high-phosphorus iron ore by microwave heating pretreatment, which increased the specific surface area of ore, but this did not obviously promote the acid leaching Phosphorus can be recycled by using acid leaching solution to treat high-phosphorus iron ore, which can get better dephosphorization effect, and the dephosphorization rate is stable at 80%, which can effectively reduce the acid consumption and protect the environment.