低品位滑石提纯工艺试验研究  

Experimental study on the purification process of low-grade talc

作　　者：王璐 仲剑初[1,2] 王洪志 Wang Lu;Zhong Jianchu;Wang Hongzhi(School of Chemical Engineering,Dalian University of Technology,Dalian Liaoning 116024,China;Engineering Laboratory of Boric and Magnesic Functional Material Preparative and Applied Technology,Dalian Liaoning 116024,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024 [2]辽宁省硼镁特种功能材料制备与应用技术工程实验室,辽宁大连116024

出　　处：《化工矿物与加工》2024年第4期8-15,共8页Industrial Minerals & Processing

摘　　要：我国低品位滑石需求量低,但高品位滑石供不应求,为了提高低品位滑石的利用价值,通过化学提纯与水热合成相结合的方法,以低品位滑石、硅酸钠为原料合成高品位滑石。分析了低品位滑石在不同时间下的酸溶解情况,探究了脉石矿物(菱镁矿)完全溶解的最佳时间。通过考查低品位滑石预处理方式、是否煅烧、前驱体形成条件、水热反应温度、时间等因素对产物结晶度和纯度的影响,得到最佳提纯合成工艺条件:在80℃下酸处理2 h后低品位滑石中的菱镁矿完全溶解;在60℃下将酸解混合液与硅酸钠混合,调节体系pH至7~8预反应6 h获得前驱体,前驱体在180℃水热条件下反应13 h,最终制备出了高品位滑石。研究成果可为我国低品位滑石的高值化利用提供借鉴。The demand for low-grade talc is low in China,but high-grade talc is in short supply.In order to improve the utilization value of low-grade talc,high-grade talc was synthesized from low-grade talc and sodium silicate by combining chemical purification with hydrothermal synthesis.The acid dissolution of low-grade talc at different time was analyzed,and the best time of complete dissolution of gangue mineral(magnesite)was investigated.By examining the effects of factors such as pretreatment method,calcination,precursor formation condition,hydrothermal reaction temperature,time of low-grade talc on the crystallinity and purity of the synthesized product,the optimal purification process conditions were obtained:the magnesite in the low-grade talc was completely dissolved after acid treatment at 80℃for 2 h;At 60℃,the acid hydrolysis mixture was mixed with sodium silicate,and the pH of the system was adjusted to 7~8 for pre-reaction for 6 h to obtain the precursor,and the precursor reacted at 180℃under hydrothermal conditions for 13 h,and finally prepared high-grade talc.The research results can provide reference for the high-value utilization of low-grade talc in China.

关 键 词：低品位滑石 菱镁矿 化学提纯 水热合成 高品位滑石 预处理 酸解 

分 类 号：TD975.3[矿业工程—选矿]