废弃菱镁矿资源化利用与高附加值氢氧化镁吸附剂制备

Resourceful Utilization of Waste Magnesite and Preparation of High Value-added Magnesium Hydroxide Adsorbent

采用硫酸铵焙烧-水浸工艺资源化利用废弃菱镁矿,将废弃菱镁矿与硫酸铵混匀,经焙烧、水浸分离得到硫酸镁溶液和滤渣,硫酸镁溶液净化除杂后制备氢氧化镁和硫酸铵,氢氧化镁煅烧制备氧化镁,硫酸铵溶液蒸浓结晶后返回焙烧废弃菱镁矿。该工艺实现了废弃菱镁矿资源化利用和化工原料的循环利用。并制备高附加值花状氢氧化镁,花状氢氧化镁对有机染料和重金属离子具有优良的吸附性能,是一种性能良好的无机吸附剂。

Waste magnesite was resourcefully utilized by(NH_(4))_(2)SO_(4)roasting-water leaching process.Waste magnesite and(NH_(4))_(2)SO_(4)were uniformly mixed,roasted,water leached and filtered,thus the MgSO_(4)solution and filter residue were obtained.The purified MgSO4 solution was used to prepare magnesium hydroxide and(NH_(4))_(2)SO_(4)solution.MgO was obtained by calcining the magnesium hydroxide.Crystalline(NH_(4))_(2)SO_(4)was returned to roasting process.The process achieves the resourceful utilization of the waste magnesite and realizes the recycling utilization of chemical material.Flower-like magnesium hydroxide with high value-added was prepared.Flower-like magnesium hydroxide has excellent adsorption properties for the organic dyes and heavy metal ions.It is a good inorganic adsorbent.