(中南大學 冶金科學與工程學院，長沙 410083)
摘 要: 以富含硼、鎂、鋰的鹽湖鹵水為原料，采用硫酸和離子交換法聯(lián)合提硼，實現(xiàn)硼與鎂、鋰分離；采用氨法沉淀鎂實現(xiàn)鎂與鋰的分離。分別用靜態(tài)法和動態(tài)法研究鹵水pH值、吸附溫度、吸附時間、樹脂用量、鹵水流速、交換柱高徑比對硼提取率的影響，確定提硼最佳工藝條件，硼提取率達95%以上。研究鹵水硼濃度對氫氧化鎂中硼含量的影響。結果表明：當鹵水中的硼濃度由4.54 mg/L增加到1 200 mg/L時，氫氧化鎂中硼含量由0.04 mg/g增加到8.82 mg/g。對硼濃度4.54 mg/L的鹵水用氨法沉淀制備氫氧化鎂，在1 500 ℃下煅燒得到氧化鎂，其純度為99.8%。
關鍵字: 鹵水；氫氧化鎂；氧化鎂；分離；提硼
（School of metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Using salt lake brine with high boron, magnesium and lithium as raw material, the boron was separated from magnesium and lithium with sulfate acid and ion exchange resin, and the magnesium was separated by precipitation with ammonia. The effects of pH value, temperature, time, resin amount, flowing rate of brine and ratio of height to diameter (H/D) of the column on boron removal were investigated under static and dynamic conditions. The optimum process conditions of boron removal are obtained. The results show that the boron removal ratio reaches 95% under the optimum process conditions. The boron concentration of brine has a significant effect on the content of boron in magnesium hydroxide. The content of boron in magnesium hydroxide increases from 0.04 mg/g to 8.82 mg/L with boron increasing from 4.54 mg/L to 1 200 mg/L. Using brine containing 4.54 mg/L boron as raw material to prepare magnesium hydroxide followed by calcination at 1 500 ℃ for 2 h, 99.8% magnesium oxide is obtained.
Key words: brine; magnesium hydroxide; magnesium oxide; separation; boron adsorption
