铬盐生产中碱性液中和除铝工艺的研究

Study on aluminum removal process in chromium salt production by alkaline solution

基于结晶学中成核附聚长大理论以及中和除铝方法,旨在为铬盐除铝工艺提供依据.通过实验研究了温度、晶种系数、酸化程度、中和时间对中和产生沉淀沉降性的影响.结果表明,通过控制中和条件,即温度为70～90℃、晶种质量为0.3 g、搅拌速度为400 r/min、滴加50％（质量分数）的硫酸1.5 mL、中和时间为2h左右,可以得到含水率为35％～45％（质量分数）铝泥以及沉降性能较好的除铝浆液.

Based on the theory of nucleation and agglomeration growth in crystallography, as well as neutralization aluminum removal method ,the theoretical basis for removing the aluminum in the production of chromium salt was provided.The influences of temperature, seed coefficient, degree of acidification, and neutralization time on the settlement properties were investigated.The results showed that：by controlling the conditions of neutralization,i.e.temperature of 70-90 ℃, seed mass of 0.3 g, stirring speed of 400 r/min, dropwise adding 1.5 mL sulfuric acid with mass fraction of 50%, and neutralization time of about 2 h, aluminum mud with moisture content of 35%-45% （mass fraction） and aluminum-free slurry with good settlement properties could both be obtained.