钙基膨润土钠化工艺过程及其对矿浆黏度影响研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (10): 3525-3532.

钙基膨润土钠化工艺过程及其对矿浆黏度影响研究

苗艳晖¹, 赵云良¹, 陈立才¹, 高仁波¹, 宋少先¹, 张婷婷²

1.武汉理工大学资源与环境工程学院,武汉 430070;
2.武汉轻工大学化学与环境工程学院,武汉 430023

收稿日期:2022-06-06 修回日期:2022-07-13 出版日期:2022-10-15 发布日期:2022-10-26
通讯作者: 赵云良,博士,教授。E-mail:zyl286@whut.edu.cn
作者简介:苗艳晖(2000—),女,硕士研究生。主要从事膨润土提纯与精深加工的研究。E-mail:miaoyanhui0210@163.com
基金资助:
国家自然科学基金面上项目(51874220);国家自然科学基金青年基金(51904215)

Sodium Modification Process of Calcium Bentonite and Its Effect on Pulp Viscosity

MIAO Yanhui¹, ZHAO Yunliang¹, CHEN Licai¹, GAO Renbo¹, SONG Shaoxian¹, ZHANG Tingting²

1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China

Received:2022-06-06 Revised:2022-07-13 Online:2022-10-15 Published:2022-10-26

摘要/Abstract

摘要： 为解决膨润土钠化过程中矿浆变黏的问题,系统研究了碳酸钠用量、矿浆浓度以及分散剂对钠化效果及矿浆黏度的影响,探讨了降低矿浆浓度和加分散剂的作用机理。结果表明:当采用降低矿浆浓度的方法时,“卡房”结构明显减少,矿浆变黏的问题得到改善,但同时会增大矿浆量,增加处理难度;当采用添加分散剂焦磷酸钠的方法时,磷酸根离子吸附在蒙脱石的正电性边缘,可以增加蒙脱石之间的排斥力,从而降低矿浆的黏度,有利于提高钠化效果。当焦磷酸钠用量为0.5%(质量分数)、矿浆浓度为5%(质量分数)、碳酸钠用量为5%(质量分数)时可制得高品质的钠基膨润土,与未钠化相比,在该条件下钠化1.5 h,得到的钠基膨润土胶质价由95 mL/15 g提高至975 mL/15 g,膨胀指数由8 mL/2 g提高至25 mL/2 g。

关键词: 钙基膨润土, 钠化, 碳酸钠, 矿浆黏度, 焦磷酸钠

Abstract: In order to solve the problem of pulp viscosity in the modification process of sodium bentonite, the effects of sodium carbonate dosage, pulp concentration and dispersant on the effect of sodium modification and pulp viscosity were systematically studied, and the mechanism of reducing pulp concentration and adding dispersant were discussed. It is found that by reducing the pulp concentration, the “house-of-cards” structure by edge-to-edge and edge-to-face contact is obviously reduced, and the problem of pulp viscosity is improved, but the pulp quantity and the treatment difficulty increase at the same time. By adding dispersant sodium pyrophosphate, phosphate ions are adsorbed on the positive edge of montmorillonite, which increases the repulsive force between montmorillonites and reduces the viscosity of pulp, and improves the sodium effect. Through systematic experiments, high quality sodium bentonite is prepared with 0.5% (mass fraction) sodium pyrophosphate, 5% (mass fraction) pulp concentration and 5% (mass fraction) sodium carbonate. In this condition, the swelling index and colloidal value of bentonite have been greatly improved, the colloid value of sodium bentonite increases from 95 mL/15 g to 975 mL/15 g, and the swelling index increases from 8 mL/2 g to 25 mL/2 g after 1.5 h sodium modification.

Key words: calcium bentonite, sodium modification, sodium carbonate, pulp viscosity, sodium pyrophosphate

中图分类号:

TD985

苗艳晖, 赵云良, 陈立才, 高仁波, 宋少先, 张婷婷. 钙基膨润土钠化工艺过程及其对矿浆黏度影响研究[J]. 硅酸盐通报, 2022, 41(10): 3525-3532.

MIAO Yanhui, ZHAO Yunliang, CHEN Licai, GAO Renbo, SONG Shaoxian, ZHANG Tingting. Sodium Modification Process of Calcium Bentonite and Its Effect on Pulp Viscosity[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3525-3532.

参考文献

[1] 韦能,徐勇强,杨勇,等.山东昌乐钠基膨润土提纯实验研究[J].矿产综合利用,2021(3):170-175.
WEI N, XU Y Q, YANG Y, et al. Beneficiation study on sodium bentonite in Changle district, Shandong[J]. Multipurpose Utilization of Mineral Resources, 2021(3): 170-175 (in Chinese).
[2] ZHANG T T, BAI H Y, ZHAO Y L, et al. Precise cation recognition in two-dimensional nanofluidic channels of clay membranes imparted from intrinsic selectivity of clays[J]. ACS Nano, 2022, 16(3): 4930-4939.
[3] 高仁波,赵云良,陈立才,等.蒙脱石层电荷密度对其二维纳米片剥离的影响[J].硅酸盐学报,2021,49(7):1420-1428.
GAO R B, ZHAO Y L, CHEN L C, et al. Effect of layer charge density on the exfoliation of montmorillonite to prepare two-dimensional nanosheets[J]. Journal of the Chinese Ceramic Society, 2021, 49(7): 1420-1428 (in Chinese).
[4] QIAO Z C, LIU Z J, ZHANG S, et al. Purification of montmorillonite and the influence of the purification method on textural properties[J]. Applied Clay Science, 2020, 187: 105491.
[5] 李鑫,吴雪兰,龙红明,等.低品质膨润土提质改性技术研究[J].硅酸盐通报,2020,39(3):837-843.
LI X, WU X L, LONG H M, et al. Study on purification and modification technology of low-quality bentonite[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(3): 837-843 (in Chinese).
[6] 张彩云,董前年,章于川,等.膨润土湿法提纯及其钠化工艺优化研究[J].非金属矿,2007,30(2):42-44.
ZHANG C Y, DONG Q N, ZHANG Y C, et al. Research on wet purification of bentonite & optimization of its Na⁺-transformation technology[J]. Non-Metallic Mines, 2007, 30(2): 42-44 (in Chinese).
[7] 冉凌瑜,王娅,施宇,等.膨润土超声离心钠化提纯试验研究[J].非金属矿,2019,42(5):58-61.
RAN L Y, WANG Y, SHI Y, et al. Experimental study on ultrasonic centrifugal sodium purification of bentonite[J]. Non-Metallic Mines, 2019, 42(5): 58-61 (in Chinese).
[8] 罗志刚,杨卓鸿,卢其明,等.钠基膨润土的制备及对Cu(Ⅱ)的吸附特性研究[J].华南农业大学学报,2014,35(3):47-51.
LUO Z G, YANG Z H, LU Q M, et al. Studies on the preparation of sodium bentonite and adsorption characteristics to Cu(Ⅱ)[J]. Journal of South China Agricultural University, 2014, 35(3): 47-51 (in Chinese).
[9] 王弘,黄丽,郭金溢,等.膨润土的湿法钠化改型方法研究[J].黄金科学技术,2012,20(1):89-93.
WANG H, HUANG L, GUO J Y, et al. Study on sodium-modified suspensoid process of bentonite[J]. Gold Science and Technology, 2012, 20(1): 89-93 (in Chinese).
[10] BAHRANOWSKI K, GAWEŁ A, KLIMEK A, et al. Influence of purification method of Na-montmorillonite on textural properties of clay mineral composites with TiO₂ nanoparticles[J]. Applied Clay Science, 2017, 140: 75-80.
[11] 杨长辉,李贞,杨魁.Ca-MMT的钠化改型及微结构变化研究[J].非金属矿,2011,34(3):19-21+44.
YANG C H, LI Z, YANG K. Research on sodium modification and microstructure of Ca-montmorillonite[J]. Non-Metallic Mines, 2011, 34(3): 19-21+44 (in Chinese).
[12] 王立满,莫伟,马少健,等.高纯钠基蒙脱石的剥离及其表征[J].矿产保护与利用,2020,40(4):124-133.
WANG L M, MO W, MA S J, et al. Delaminating and characterizing of high purity sodium montmorillonite[J]. Conservation and Utilization of Mineral Resources, 2020, 40(4): 124-133 (in Chinese).
[13] 王桂芳,盘益任,马少健,等.广西田东某钙基膨润土钠化改型试验[J].金属矿山,2017(4):87-90.
WANG G F, PAN Y R, MA S J, et al. Sodium modification study on a Ca-based bentonite from Tiandong, Guangxi[J]. Metal Mine, 2017(4): 87-90 (in Chinese).
[14] CHEN L C, ZHAO Y L, BAI H Y, et al. Role of montmorillonite, kaolinite, or illite in pyrite flotation: differences in clay behavior based on their structures[J]. Langmuir: the ACS Journal of Surfaces and Colloids, 2020, 36(36): 10860-10867.
[15] 邱俊,宋吉勇,吕宪俊.蒙脱石矿物凝胶流变性能变化规律研究[J].非金属矿,2007,30(3):1-3+11.
QIU J, SONG J Y, LU X J. Study on rules of rheological properties of montmorillonite gel[J]. Non-Metallic Mines, 2007, 30(3): 1-3+11 (in Chinese).
[16] 钱蕴,吉静,王峰,等.焦磷酸钠对改性膨润土分散性的影响[J].涂料工业,2010,40(10):8-11+14.
QIAN Y, JI J, WANG F, et al. Influence of sodium pyrophosphate on dispersion of bentonite[J]. Paint & Coatings Industry, 2010, 40(10): 8-11+14 (in Chinese).
[17] 秦明明,吉静,王峰.无机盐对膨润土/水分散体系的影响[J].新型建筑材料,2009,36(11):32-34.
QIN M M, JI J, WANG F. The effect of inorganic salt to bentonite/water dispersion system[J]. New Building Materials, 2009, 36(11): 32-34 (in Chinese).