Resourceful Utilization of Waste Magnesite and Preparation of High Value-added Magnesium Hydroxide Adsorbent
Waste magnesite was resourcefully utilized by(NH4)2SO4 roasting-water leaching process.Waste magnesite and(NH4)2SO4 were uniformly mixed,roasted,water leached and filtered,thus the MgSO4 solution and filter residue were obtained.The purified MgSO4 solution was used to prepare magnesium hydroxide and(NH4)2SO4 solution.MgO was obtained by calcining the magnesium hydroxide.Crystalline(NH4)2SO4 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.
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