攀西某微细粒钛磁铁矿强化分散—磁选试验

刘才鹏; 王维清; 孙晋睿; 熊惠明; 刘柳

doi:10.7513/j.issn.1004-7638.2024.03.016

攀西某微细粒钛磁铁矿强化分散—磁选试验

doi: 10.7513/j.issn.1004-7638.2024.03.016

刘才鹏^1,,
王维清^{1, 2, ,},
孙晋睿¹,
熊惠明¹,
刘柳¹

1.
西南科技大学环境与资源学院, 四川绵阳 621010
2.
固体废物处理与资源化教育部重点实验室, 四川绵阳 621010

详细信息

作者简介:
刘才鹏，1999年出生，男，四川成都人，硕士研究生，研究方向为矿业工程，E-mail：1481267028@qq.com

通讯作者:
王维清，教授，博士生导师，E-mail：wangweiqing@swust.edu.cn

中图分类号: TD95
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- 被引次数: 0
出版历程
- 收稿日期: 2024-02-27
- 刊出日期: 2024-07-02

Enhanced dispersion-magnetic separation tests for micro-fine titanomagnetite in Panxi area

1.
School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
2.
Key Laboratory of Solid Waste Treatment and Recycling, Ministry of Education, Mianyang621010, Sichuan, China

摘要

摘要: 攀西某微细粒钛磁铁矿混合粗精矿因微细粒脉石矿物与钛磁铁矿异相凝聚，常规弱磁选提铁降杂指标较差，采用强化分散—磁选可有效改善选别效果、提高分选指标。为了强化分选矿样中的微细粒铁矿物，对强化分散—磁选工艺条件开展试验研究，考察了分散剂种类、分散剂用量、矿浆pH值、磁场强度等因素对分选效果的影响。试验结果表明：在矿浆浓度20%、机械搅拌速度1 992 r/min、搅拌时间3 min、六偏磷酸钠用量1 000 g/t、矿浆pH值10、磁场强度300 kA/m的条件下，获得了精矿铁品位57.69%，铁回收率98.10%的良好指标。与直接磁选结果相比，铁品位提高了1.26个百分点。DLVO理论分析表明，六偏磷酸钠通过降低钛磁铁矿和钛辉石表面电位，增大了二者异相之间的静电斥力，从而削弱微细粒脉石矿物与钛磁铁矿异相凝聚。
- 微细粒级钛磁铁矿 /
- 选钛 /
- 分散剂 /
- DLVO理论
Abstract: Due to the heterogeneous coagulation of fine-grained gangue minerals and titanomagnetite in the mixed rough concentrate of a fine-grained titanomagnetite in Panxi area, the iron extraction and impurity reduction index of conventional low-intensity magnetic separation is poor. The enhanced dispersion-magnetic separation can effectively improve the separation effect and improve the separation index. In order to strengthen the separation of fine-grained iron minerals in the ore samples, the experimental study on the process conditions of enhanced dispersion-magnetic separation was carried out to investigate the effects of dispersant type, dispersant dosage, slurry pH, magnetic field strength and other factors on the separation effect. The test results show that under the conditions of 20% slurry concentration, mechanical stirring speed of 1 992 r/min, stirring time of 3 min, dosage of SHMP of 1 000 g/t, slurry pH of 10 and magnetic field strength of 300 kA/m, a good index of 57.69% iron grade in concentrate and 98.10% iron recovery was obtained. Compared with the results of direct magnetic separation, the iron grade increased by 1.26%. DLVO theoretical analysis shows that sodium hexametaphosphate increases the electrostatic repulsion between titanomagnetite and titanaugite by reducing the surface potential of titanomagnetite and titanaugite, thus weakening the heterogeneous coagulation of fine gangue minerals and titanomagnetite.
- fine-grained titanium magnetite /
- titanium concentration /
- dispersant /
- DLVO theory

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图 1 矿样的XRD谱

Figure 1. XRD spectra analysis results of the sample

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图 2 矿样SEM形貌及A、B点的EDS能谱分析结果

Figure 2. SEM of sample and EDS patterns of points A and B shown in Fig.2

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图 3 分散剂种类和用量对分散度的影响

Figure 3. Effect of types and dosage of dispersant on dispersity

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图 4 分散剂用量对磁选指标的影响

Figure 4. Effect of dispersant dosage on magnetic separation index

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图 5 矿浆pH值对磁选粗精矿指标的结果

Figure 5. Effect of pH value on magnetic separation index

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图 6 磁场强度对磁选指标效果的影响

Figure 6. Effect of magnetic field intensity on magnetic separation index

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图 7 钛磁铁矿与钛辉石相互作用势能曲线

（a）六偏磷酸钠 =0 g/t ；（b）六偏磷酸钠= 1000 g/t

Figure 7. Potential energy curve for the interaction of titanomagnetite with titanaugite

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表 1 矿样化学多元素分析结果

Table 1. Chemical multi-element analysis of the sample %

TFe	TiO₂	SiO₂	Al₂O₃	CaO	MgO	V₂O₅	Cr₂O₃
55.61	11.50	2.70	3.51	1.97	1.46	0.57	0.29

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表 2 矿样筛析试验结果

Table 2. The sieve analysis results of the sample

粒级/μm	产率/%	TFe品位/%	TFe分布率/%
−74～+48	20.45	54.18	19.92
−48～+38	11.27	54.69	11.08
−38～+30	12.82	55.03	12.69
−30～+23	51.27	57.25	52.78
−23～+18	2.99	48.75	2.62
−18	1.20	41.83	0.91
合计	100.00	55.61	100.00

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表 3 最终精矿筛析试验结果

Table 3. The sieve analysis results of the final concentrate

粒级/μm	产率/%	TFe品位/%	TFe分布率/%
−74～+48	19.41	56.08	18.88
−48～+38	14.96	56.46	14.65
−38～+30	17.08	58.08	17.21
−30～+23	38.25	59.02	39.15
−23～+18	6.87	56.83	6.77
−18	3.43	56.23	3.34
合计	100.00	57.65	100.00

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