In this work, the comprehensive utilization of spodumene waste residue - lithium slag is achieved. An experimental scheme of hydrothermal preparation of nano-kaolinite and xonotlite from it is proposed. The W-lithium slag is completely decomposed into sodalite and then transformed into hydroxycancrinite in 6 mol/kg NaOH solution at 220 ℃. As an intermediate product, hydroxycancrinite was reacted with 0.65 mol/kg HNO₃ solution at 260 ℃ for 24 h to prepare nano-kaolinite successfully. The desiliconization filtrate produced by the reaction of W-lithium slag and NaOH solution was used as raw material, mixed with CaO and reacted at 260 ℃ for 12 h after aging for 12 h, then xonotlite was successfully prepared. This work demonstrates great potential on green recycling of spodumene waste residue from lithium extraction process and introduce a new economical processing technique for the slag as well.

本工作实现了锂辉石废渣-锂渣的综合利用。提出了水热制备纳米高岭石和硬硅钙石的实验方案。W-锂渣在220 ℃下在6 mol/kg NaOH溶液中完全分解为方钠石，然后转化为羟基钙锌矿。作为中间产物，羟基cancrinite与0.65 mol/kg HNO _{3 反应}260 ℃ 24 h 溶液成功制备纳米高岭石。以钨锂渣与NaOH溶液反应生成的脱硅滤液为原料，与CaO混合，老化12h后，在260℃反应12h，成功制备硬硅钙石。这项工作展示了锂提取过程中锂辉石废渣绿色回收的巨大潜力，并为渣引入了一种新的经济处理技术。