Method for preparing kaolinite and xonotlite from spodumene lithium extraction tailings
By washing and chemical reactions on the lithium slag, the lithium slag was successfully converted into kaolinite and hard silicate, which solved the problem of the ineffective utilization of lithium slag, improved resource utilization and reduced environmental pollution.
CN119976865APending Publication Date: 2025-05-13FENGCHENG JIULING LITHIUM IND CO LTD
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Patent Information
- Application Number
- CN202510023235.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-05-13
AI Technical Summary
Technical Problem
The lithium slag produced during the spodumene sulfuric acid roasting process is of low value and cannot be effectively utilized, resulting in environmental pollution and waste of resources.
Method used
The lithium slag was washed with water and reacted with NaOH solution to form hydroxycalciumite, which was then converted into kaolinite under acidic conditions. At the same time, hard silicaite was prepared by reacting with lime milk.
Benefits of technology
The useful components in lithium slag were extracted to prepare high-value kaolinite and hard silicate, which improved resource utilization and solved the problem of lithium slag storage and environmental pollution.
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Abstract
The invention discloses a method for preparing kaolinite and xonotlite from spodumene lithium extraction tailings. The method comprises the following steps: washing lithium slag to obtain washed lithium slag; the washed lithium slag is mixed with a NaOH solution, and after the reaction is finished, the ancrinite is obtained, and the residual solution is desiliconized filtrate; mixing the cancrinite with an HNO3 solution, and heating to generate kaolinite; roasting calcium oxide, dissolving in water, stirring and aging; adding the desiliconized filtrate into an aged lime milk solution to prepare a mixed solution; reacting the mixed solution in a homogeneous reactor to obtain a hydrated calcium silicate product; the method comprises the following steps: weighing hydrated calcium silicate, adding deionized water to prepare a mixed solution, putting the mixed solution into a polytetrafluoroethylene lining, cooling a reaction kettle to room temperature, taking out the lining, washing a reactant with deionized water, filtering, and drying a filter cake in an electrothermal blowing dry box to obtain xonotlite. According to the preparation method, useful components in the lithium extraction tailings of spodumene can be extracted, and the utilization rate of resources is increased.
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