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.
Abstract:
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.
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