辽宁某低品位菱镁矿提纯降杂试验研究

摘要

辽宁镁矿资源储量丰富,菱镁矿降杂提纯是个现实问题.本文针对辽宁某菱镁矿钙镁含量高的特点,通过采用“反一正”浮选的工艺流程来降低菱镁矿中硅钙杂质,对该菱镁矿进行提纯降杂试验.通过条件试验确定磨矿细度-0.074 mm 70％,反浮选使用混合胺作为捕收剂用量150 g/t;正浮选pH值调整剂为碳酸钠用量800 g/t,混合抑制剂为水玻璃和六偏磷酸钠按4∶1混合用量600 g/t,捕收剂为油酸钠用量1200 g/t的药剂制度.通过二次反浮选二次正浮选的工艺流程最终获得菱镁矿回收率为68.21％,该工艺流程把菱镁矿MgO品位从41.78％提高到46.87％,SiO2和CaO含量分别从4.21％和3.15％降到0.41％和0.91％的良好指标.该试验研究结果可为低品位菱镁矿提纯降杂提供基础依据.%The magnesium ore resource reserve is abundant in Liaoning,but Magnesite miscellaneous purification is a reality problem.According to the characteristic of high content of calcium and magnesium in some magnesite in Liaoning,we adopted the technical process of" reverse-direct flotation"to reduce impurities of calcium and silicon in the magnesite,and to carry out purification and impurity reducing test on the magnesite.Through conditional tests,the grinding fineness of-0.074 mm was determined to be 70％.For reverse flotation,mixed amine was used as the collector and the dosage was 150g/t;for direct flotation,sodium carbonate was used as the pH regulator and the dosage was 800g/t,water glass and sodium hexametaphosphate were used as the mixed inhibitors with the ratio of 4 ∶ 1 and the mixed dosage was 600g/t,sodium oleate was used as the collector and the dosage was 1200g/t.Finally,the recovery rate of the magnesite was 68.21％ using the technical process of two-time reverse flotation and two-time direct flotation,the grade of the magnesite MgO was raised to 46.87％ from 41.78％,and the contents of SiO2 and CaO were reduced to 0.41％ and 0.91％ from 4.21％ and 3.15％,respectively.The results of this study can provide practical reference bases for purification and reducing impurity of low-grade magnesite.