低品位高硅铝土矿静态焙烧溶出

马长喜; 夏飞龙; 张姗姗; 张强

doi:10.3969/j.issn.1000-6532.2023.02.002

低品位高硅铝土矿静态焙烧溶出

doi: 10.3969/j.issn.1000-6532.2023.02.002

马长喜^1,,
夏飞龙^2, ,,
张姗姗¹,
张强^{1, 3, 4, 5}

1.
商丘工学院机械工程学院，河南　商丘　476000
2.
贵州瓮福蓝天氟化工股份有限公司，贵州　贵阳　550501
3.
贵州大学材料与冶金学院，贵州　贵阳　550025
4.
贵州省冶金工程与过程节能重点实验室，贵州　贵阳　550025
5.
共伴生有色金属资源加压湿法冶金技术国家重点实验室，云南　昆明　650503

基金项目: 国家自然科学基金低品位高硫铝土矿闪速焙烧脱硫与碱溶脱硅的调制机制（51774079）；加压酸浸锰烟尘回收锰过程选择性强化机理研究（51764007）

详细信息

作者简介:
马长喜（1988-），男，实验师，主要研究方向为矿物加工及资源综合利用

通讯作者:
夏飞龙（1993-），男，硕士，助理工程师，主要研究方向为湿法冶金

中图分类号: TD98
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- HTML全文浏览量: 19
- PDF下载量: 11
- 被引次数: 0
出版历程
- 收稿日期: 2021-02-25

Study on Digestion of Low Grade High Silica Bauxite by Static Roasting

Ma Changxi^1
,,
Xia Feilong^{2
, ,},
Zhang Shanshan¹,
Zhang Qiang^{1, 3, 4, 5}

1.
College of Mechanical Engineering, Shangqiu Institute of Technology, Shangqiu, Henan, China
2.
Guizhou Wengfu Lantian Fluorine Chemical Co., Ltd., Guiyang, Guizhou, China
3.
College of Material and Metallurgy, Guizhou University, Guiyang, Guizhou, China
4.
Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, Guizhou, China
5.
State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources, Kunming, Yunnan, China

摘要

摘要: 针对低品位高硅铝土矿溶出性能差，本文采用低温静态焙烧溶出工艺，考查焙烧温度、焙烧时间及矿石粒径对氧化铝溶出效果的影响。其结果表明：矿石含铝主要物相为一水软铝石、一水硬铝，其在焙烧过程中分解温度为515 ℃。经过焙烧后，矿石结构变为疏松孔洞及沟壑结构。在焙烧温度600 ℃、焙烧时间90 s、矿石粒径150 μm条件下，氧化铝相对溶出率最优，较原矿提高7.57%达到了97.88%。焙烧矿氧化铝溶出限制性环节为内扩散，其表观活化能为44.72 kJ/mol。
- 高硅 /
- 铝土矿 /
- 焙烧 /
- 溶出 /
- 热重
Abstract: Aiming at the problem of poor digestion performance of alumina from low-grade high-silica bauxite, the low-temperature static roasting and digestion process was used to investigate the effects of roasting temperature, roasting time and ore size on the digestion effect of alumina. The results show that the main phases of aluminum in the ore are boehmite and diaspore, and the decomposition temperature during the roasting process is 515 ℃. After roasting, the structure of the ore becomes a porous and gully structure. Under the conditions of roasting temperature of 600 ℃, roasting time of the 90 s, and ore particle size of 150 μm, the relative digestion rate of alumina is the best, which is 7.57% higher than the raw ore to 97.88%. The limiting link of alumina dissolution from calcined ore is internal diffusion, and its apparent activation energy is 44.72 kJ/mol.
- High silicon /
- Bauxite /
- Roasting /
- Digestion /
- Thermogravimetry

HTML全文

图 1 焙烧温度对氧化铝溶出的影响

Figure 1. Effect of roasting temperature on digestion performance

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图 2 焙烧时间对氧化铝溶出的影响

Figure 2. Effect of roasting time on digestion performance

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图 3 焙烧时间对氧化铝溶出的影响

Figure 3. Effect of roasting ore size on digestion performance

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图 4 原矿XRD

Figure 4. X-ray diffraction spectrum of raw bauxite

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图 5 原矿TG-DTA曲线

Figure 5. TG-DTA curves of raw ore

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图 6 样品焙烧前后的SEM

Figure 6. SEM of samples before and after roasted

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图 7 1-（1-α）^1/3=kt模型动力学曲线

Figure 7. Model dynamics curve of 1-（1-α）^1/3=kt

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图 8 1-2/3α-(1-α)^2/3=kt模型动力学曲线

Figure 8. Model dynamics curve of 1-2/3α-(1-α)^2/3=kt

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表 1 铝土矿化学成分/%

Table 1. Chemical composition of bauxite

Al₂O₃	TFe₂O₃	SiO₂	TiO₂	T_S	CaO	MgO	K₂O	Na₂O	LOSS	总计
62.83	4.15	16.42	2.37	1.20	0.35	0.26	0.52	0.11	11.23	99.44

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表 2 氧化铝溶出率与时间的关系

Table 2. Data of alumina digestion rate versus time

时间/min	原矿氧化铝溶出率%			焙烧矿溶出率%
时间/min	260 ℃	270 ℃	280 ℃	260 ℃	270 ℃	280 ℃
10	7.865	8.35	9.854	9.85	10.65	11.95
30	38.45	41.03	42.31	36.25	44.32	49.79
45	56.38	58.65	58.35	58.65	63.54	67.17
60	61.97	65.34	67.1	60.35	65.65	71.91
70	66.37	68.34	69.82	63.25	69.08	72.09

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