钛铁矿直接还原回收铁同步制备钛酸钙的研究

李刚; 寇珏; 孙体昌; 李小辉

doi:10.7513/j.issn.1004-7638.2021.04.005

钛铁矿直接还原回收铁同步制备钛酸钙的研究

doi: 10.7513/j.issn.1004-7638.2021.04.005

李刚^1,,
寇珏^1, ,,
孙体昌¹,
李小辉^{1, 2}

1.
北京科技大学土木与资源工程学院，北京 100083
2.
曲靖师范学院文化旅游学院，云南曲靖 655011

基金项目: 国家自然科学基金（51674018）资助项目

详细信息

作者简介:
李刚（1996−），男，硕士研究生，长期从事矿物加工方面的研究工作，E-mail： 2607790196@qq.com；

通讯作者:
寇珏（1981−），女，教授，博士生导师，长期从事矿物加工方面的教学和研究工作，E-mail：koujue@ustb.edu.cn

中图分类号: TF823
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- 文章访问数: 330
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-29
- 刊出日期: 2021-08-10

Simultaneous preparation of calcium titanate from ilmenite by direct reduction and recovery of iron

Li Gang^1
,,
Kou Jue^{1
, ,},
Sun Tichang¹,
Li Xiaohui^{1, 2}

1.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Faculty of Culture and Tourism, Qujing Normal University, Qujing 655011, Yunnan, China

摘要

摘要: 研究了钛铁矿煤基包埋法直接还原铁同步制备钛酸钙过程中钛的物相转化和钛酸钙的生成机制，阐明了添加剂碳酸钙用量和焙烧温度等因素对还原铁和钛酸钙的影响规律和作用机理。结果表明，含60%碳酸钙的钛铁矿生球团在1400 ℃下煤基包埋法恒温焙烧180 min，可以在制得直接还原铁的同时使钛以纯钛酸钙的形式产出。在添加剂碳酸钙的作用下，焙烧温度>1300 ℃时，钛酸钙开始作为主要含钛物相产出，试验得出的最佳焙烧温度为1400 ℃。随着碳酸钙用量的增加，焙烧产物中黑钛石的含量逐渐减少，钛酸钙的含量逐渐增多。但是碳酸钙用量大会导致还原铁颗粒变细，不利于后续的磨矿磁选分离。实验室条件下通过两段磨矿磁选最终获得还原铁产品TFe品位为81.86%、回收率为91.27%，钛酸钙产品中Ti品位为26.95%、钛酸钙含量为76.37%，钛的回收率为90.15%。
- 钛铁矿 /
- 直接还原 /
- 煤基包埋法 /
- 焙烧 /
- 钛酸钙 /
- 还原铁
Abstract: The paper studied the phase transformation of titanium and the formation mechanism of calcium titanate during the simultaneous preparation of calcium titanate by direct reduction of iron from ilmenite coal-based embedding method, and clarified the influence of additives such as calcium carbonate dosage and roasting temperature on reduced iron and titanium. The influence law and mechanism of calcium acid. The results show that the raw ilmenite pellets containing 60% calcium carbonate are roasted at a constant temperature of 1400 ℃ for 180 min by the coal-based embedding method, which can produce direct reduced iron while simultaneously producing titanium in the form of pure calcium titanate. Under the action of the additive calcium carbonate, when the calcination temperature is >1300 ℃, calcium titanate begins to be produced as the main titanium-containing phase, and the best calcination temperature obtained by the experiment is 1400 ℃. As the amount of calcium carbonate increases, the content of black titanite in the calcined product gradually decreases, and the content of calcium titanate gradually increases. However, the large amount of calcium carbonate causes the reduced iron particles to become finer, which is not conducive to the subsequent grinding and magnetic separation. Under laboratory conditions, the TFe grade of the reduced iron product is 81.86% and the recovery rate is 91.27%. The grade of Ti in the calcium titanate product is 26.95%, the content of calcium titanate is 76.37% and the recovery rate of titanium is 90.15%.
- ilmenite /
- direct reduction /
- coal-based embedding method /
- roasting /
- calcium titanate /
- reduced iron

HTML全文

图 1 试样的XRD衍射图谱及分析

a-钛铁矿(FeTiO₃)；b-石英(SiO₂)；c-镁绿泥石((Mg₂Al)(AlSiO₅)(OH)₄)；d-辉石(CaMgSi₂O₆)

Figure 1. XRD diffraction pattern and analysis diagram of the sample

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图 2 试验流程及包埋示意

Figure 2. Schematic diagram of embedding and test flow chart

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图 3 直接还原过程各反应的Δ_rG_m^θ与T关系

Figure 3. Relationship between Δ_rG_m^θ and T in the direct reduction process

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图 4 不同碳酸钙用量下焙烧产物的XRD图谱

a-钛酸钙(CaTiO₃)；b-还原铁(Fe)；c-黑钛石((Fe_0.33Ti_0.46Mg_0.21)(Ti_1.9Mg_0.1)O₅)

Figure 4. XRD patterns of roasted ores with different calcium carbonate contents

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图 5 不同碳酸钙用量时直接还原产物的SEM-EDS形貌

Figure 5. SEM-EDS morphologies of direct reduction products with different amount of calcium carbonate

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图 6 不同碳酸钙用量条件下焙烧矿中铁颗粒的粒度分布

Figure 6. Particle size distribution of iron in roasted ore with different calcium carbonate content

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图 7 碳酸钙用量55%和60%的SEM-EDS形貌

(b₁)碳酸钙用量55%；(c₁)碳酸钙用量60%；点1-还原铁（Fe）；点3-钛酸钙（CaTiO₃）；点4-钛酸镁(MgTi₂O₅)；点5-辉石(CaMgSi₂O₆)

Figure 7. SEM-EDS morphologies of 55% and 60% calcium carbonate

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图 8 不同焙烧温度条件下焙烧产物的XRD图谱

a-黑钛石（Fe_0.5Mg_0.5Ti₂O₅）；b-氧化钙（CaO）；c-还原铁（Fe）；d-钛酸钙（CaTiO₃）；e- 辉石（CaMgSi₂O₆）

Figure 8. XRD patterns of calcined products at different calcination temperatures

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图 9 不同温度时直接还原产物的SEM-EDS形貌

(g)焙烧温度1300 ℃；(h)焙烧温度1400 ℃；(i)焙烧温度1500 ℃

Figure 9. SEM-EDS morphologies of direct reduction products at different temperatures

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图 10 不同焙烧温度条件下焙烧矿中的铁颗粒粒度分布

Figure 10. Distribution of iron particle size at different roasting temperatures

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表 1 试样粒度组成

Table 1. Grain size composition of samples

粒级/mm 含量/%

+0.074 20.28
−0.074～+0.045 31.19
−0.045～+0.038 32.98
−0.038 15.55
合计 100

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表 2 试样的主要化学组成

Table 2. Main chemical compositions of samples %

TiO₂ TFe MgO SiO₂ Al₂O₃ MnO CaO S V₂O₅

45.28 29.01 4.91 2.24 0.89 0.610 0.55 0.15 0.058

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