柱撑改性蒙脱石吸附脱色海盐卤水试验研究

摘要

为提高海盐卤水资源化产品价值,降低有色杂质对产品的影响,以振荡吸附法对比改性前后蒙脱石对海盐卤水的脱色效果,并探讨蒙脱石用量、振荡时间、pH值、吸附温度等因素对脱色率的影响.结果表明:钙基蒙脱石经过柱撑改性后色度去除率显著提高,每50 mL卤水添加8 g柱撑蒙脱石,pH值为4,70 ℃恒温振荡90 min,色度去除率为76.59%,CODcr降低率为69.89%,脱色后卤水以氨水沉淀法制备的氢氧化镁白度为96.3%,镁离子回收率为94.47%,符合HG/T 3607-2007中I类标准,吸附色素的柱撑蒙脱石经400 ℃灼烧后具有不低于7次的循环使用性能.%In order to increase the value of the products made of sea salt brine and decline the influence from coloring matter. Use batch adsorption to compare the decoloration property between Ca-montmorillonite and modified montmorillonite. Discuss the factors which affect decoloration rate, including the dosage of montmorillonite, shaking time, pH value and temperature. The experimental result show that chroma removing rate reach 76.59% and CODcrdecreasing rate reach 69.89% while dosage of montmorillonite is 8 g per 50 mL brine, pH is 4, temperature is 70 ℃, shaking time is 90 min. The magnesium hydrate whiteness is 96.3% which obtained by decolorized brine and ammonia water co-precipitation. Magnesium ions recovery is 94.47% which can reach the standard of HG/T 3607-2007 type I. The pillared montmorillonite adsorbed coloring matter have 7 times cycle operational performance under 400 ℃ burning regeneration.