高岭土除铁增白酸水处理工艺优化研究

Optimization of Acid Water Treatment Process for Iron Removal and Whitening of Kaolin

以茂名高岭土生产过程中产生的除铁增白酸水为研究对象,在现有水处理工艺分析及试验研究基础上,提出“重力沉降—石灰中和—氧化曝气—絮凝沉淀”处理的优化工艺。结果表明,经重力沉降高岭土回收率可达到90%,质量达到GB/T14563-2020《高岭土及其试验方法》中涂料行业用水洗高岭土指标要求,后续处理过程中絮凝剂PAC用量可减少70%。并探讨处理水回用对分散剂六偏磷酸钠用量的影响。

Based on the analysis and experimental research of the existing water treatment process,an optimal process of"gravity sedimentation-lime neutralization-oxidation aeration-flocculation precipitation"was proposed for the removal of iron and whitening acid from the production of Maoming kaolin.The results show that the recovery rate of kaolin by gravity sedimentation can reach 90%,and the quality can meet the index requirements of the coating industry to wash kaolin with water in GB/T14563-2020"Kaolin and its test methods",and the dosage of flocculant PAC in the subsequent treatment process can be reduced by 70%.The influence of treatment water reuse on the amount of sodium hexametaphosphate dispersant was also discussed.