金红石型钛白不同初品湿磨分散性能研究

杨芳; 刘婵; 路瑞芳; 石瑞成

doi:10.7513/j.issn.1004-7638.2024.04.005

金红石型钛白不同初品湿磨分散性能研究

doi: 10.7513/j.issn.1004-7638.2024.04.005

钒钛资源综合利用国家重点实验室, 攀钢集团研究院有限公司, 四川攀枝花 617000

基金项目: 国家自然科学基金青年科学基金项目（编号：22108019）。

详细信息

作者简介:
杨芳，1994 年出生，女，四川攀枝花人，工程师，主要从事硫酸法钛白后处理工艺开发及应用研究，E-mail: yangf9329@163.com

通讯作者:
刘婵，1987年出生，女，河南郑州人，高级工程师，主要从事钛白工艺优化和新产品开发工作，E-mail: liuc870216@163.com

中图分类号: TF823
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出版历程
- 收稿日期: 2023-12-05
- 刊出日期: 2024-08-30

Research on wet gringding dispersion properties of different rutile TiO₂ initial products

State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China

摘要

摘要: 以四种工业钛白粉辊压磨初品为原料，研究锌铝两系金红石钛白初品在不同打浆浓度条件下的湿磨分散性能，通过浆料粘度、分散稳定性、分散粒度及上清液电导率表征分散性能的差异。结果表明：同等硅酸钠分散工艺下，锌系初品分散性能均弱于铝系初品，且浆料粘度随打浆浓度升高而增大；各锌系初品的极限打浆浓度差异较大，硅酸钠加量为SiO₂/TiO₂质量比0.30%时，锌系初品B极限分散浓度可达500 g/L，但仍未达到铝系初品水平。低浓度状态下，各初品浆料中存在更多的小粒子，分散更加稳定，随着打浆浓度升高，浆料分散稳定性随之降低；粘度更低的浆料沉降比更高，即分散稳定性越差。各类初品表面电荷量各不相同，表面电荷更多的初品其粘度更低。
- 钛白粉 /
- 锌系 /
- 铝系 /
- 分散性能 /
- 硅酸钠
Abstract: In this work, four kinds of industrial TiO₂ initial products were used as raw materials to study the wet gringding dispersion of Zn series TiO₂ and Al series TiO₂ at different concentrations. Then, the difference of dispersion properties was analyzed by the characterization of slurry viscosity, dispersion stability, particle size and supernatant conductivity. The results show that the dispersibility of Zn series products is weaker than that of Al series products under the same sodium silicate dispersion process, and the slurry viscosity increases with the increase of beating concentration. The limit beating concentration of each Zn series products is different. When Na₂SiO₃ addition is 0.30% of the mass ratio of SiO₂/TiO₂, the highest dispersion concentration of Zn series B can reach 500 g/L, but it still can not reach the level of Al series products. At low concentrations below 300 g/L, there are more small particle size particles in each product, so the dispersion is more stable. With the increase of concentration, the dispersion stability of slurry decreases. The lower the viscosity of the slurry, the worse the dispersion stability. The amount of surface charge of all kinds of raw materials varies, and TiO₂ with more surface charge has lower viscosity.
- TiO₂ powder /
- Zn series /
- Al series /
- dispersion property /
- sodium silicate

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图 1 浆料粘度与打浆浓度的关系

Figure 1. The change of slurry viscosity with concentration

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图 2 不同打浆浓度对钛白分散粒度的影响

(a)浆料浓度为300 g/L时的粒径分布；(b)浆料浓度为400 g/L时的粒径分布；(c)浆料浓度为500 g/L时的粒径分布

Figure 2. Particle size distribution at different concentration

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图 3 浆料浓度与沉降比的关系

Figure 3. The change of slurry settling ratio with concentration

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图 4 体系上清液电导率与打浆浓度的关系

Figure 4. The change of conductivity of supernatant with concentration

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表 1 钛白粉初品元素含量、比表面积及粒径

Table 1. The element content, specific surface area and particle size of initial TiO₂ products

编号	w/%								比表面积/ （m²·g⁻¹）	粒径/nm
编号	P	S	Fe	Zn	K₂O	Al₂O₃	P₂O₅	ZnO	比表面积/ （m²·g⁻¹）	粒径/nm
A	0.078	0.05	<0.01	0.083	0.234	<0.01	0.1787	0.1033	6.505±0.0128	2.2178
B	0.074	0.033	<0.01	0.083	0.199	<0.01	0.1695	0.1033	5.983±0.0325	2.2048
C	0.127	0.037	<0.01	<0.01	0.282	0.318	0.2910		5.9501±0.042	2.1933
D	0.057	0.135	<0.01	0.076	0.272	<0.01	0.1306	0.0945	5.647±0.0288	2.2093

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表 2 主要试验设备

Table 2. The main experimental devices

设备名称	生产厂家	型号
电导率仪	上海仪电科学仪器有限公司	DDSJ-318T
流变仪	标格达精密仪器（广州）有限公司	BGD 157/TS
离心机	北京时代北利离心机有限公司	GT10-2
立式砂磨机	Shenzhen INVT Electric Co., Ltd	CHE1000R7G-S2
搅拌器	上海梅颖浦仪器仪表制造有限公司	H2010G
比表面仪	Micromeritics Instrument Crop	Gemini VII
激光粒度仪	Malvern Instruments Ltd	Mastersizer 3000

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表 3 砂磨浆料静置沉降上清液浑浊度

Table 3. The turbidity of supernatant of slurry after settling

打浆浓度/(g·L⁻¹)	A	B	C	D
300	▲▲▲▲▲	▲▲▲▲▲	▲▲▲▲▲	▲
400	▲▲▲▲	▲▲▲▲	▲▲▲▲
500		▲▲▲	▲▲▲
注：▲表示上层清液浑浊度，个数越多越浑浊。

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表 4 上清液电导率-打浆浓度线性拟合结果

Table 4. The fitting results of supernatant conductivity and concentration

编号	线性拟合公式	R²
A	电导率 = 0.2567 + 0.006850×浓度	1
B	电导率 = 0.2210 + 0.005755×浓度	0.999
C	电导率 = 0.4867 + 0.007150×浓度	1
D	电导率 = 0.4300 + 0.012900×浓度	1

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