改善氢氧化镁过滤性能的研究

来源期刊：中南大学学报(自然科学版)1980年第2期

论文作者：王立川 付群英

文章页码：51 - 59

关键词：中和法，氧化镁生产，过滤系数，液温，凝聚，沉降，氯化镁过量数，粒度

摘    要：用中和法从白云石及卤水生产氧化镁时,常遇到氢氧化镁很难过滤的问题。我们在液温大于90℃时将白云石煅粉（—40目）直接加入到预先添加少量的SO₄^2-离子（～100ppm）的含Mgl₂>100～142克·升^-1的溶液中,过滤系数高达800～2000×10⁷厘米·秒^-1,经轻烧脱水后,产品中含MgO达94～95%以上。基于实验数据,我们认为加速中和反应及凝聚长大可改进过滤性能,该观点对改善其他湿法的沉降和过滤也可能是有效的。

Abstract: The primary problem encountered in production magnesium oxide fromdolomite and bittern by neutralization was that the filtration of the yieledmagnesium hydroxide was very difficult.When we added first small amountof SO₄^2- ions（～100ppm）to the bittern containing>100～142g/1 MgCl₂ at atemperature of>90℃ and then fine calcined dolomite（—40 mesh）directly addedto the solution,the constant of filtration of Mg（OH）₂ was higher than800～2000×10^-7cm/sec and after dehydration by slight calcination theproduct contained MgO>94～95%。Based on the experimental data we maysuggest that accelerating the reaction of neutralization and coagulating thecrystalgrowth would improve the filtrability.This point of view is pro-bably effective for improving the filtration or sedimentation in other hy-drometallurial processes.