钙法钒渣熟料流态化浸出工艺研究

汪劲鹏; 彭毅

doi:10.7513/j.issn.1004-7638.2021.04.001

钙法钒渣熟料流态化浸出工艺研究

doi: 10.7513/j.issn.1004-7638.2021.04.001

汪劲鹏,
彭毅

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

详细信息

作者简介:
汪劲鹏（1991−），男，湖北黄冈人，高级工程师，主要从事钒资源高效提取及利用研究，E-mail：1257549530@qq.com

中图分类号: TF841.3
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出版历程
- 收稿日期: 2021-06-21
- 刊出日期: 2021-08-10

Study on fluidized leaching of calcified vanadium slag clinker

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

摘要

摘要: 利用散式直管流化床进行了钙法钒渣熟料流态化浸出工艺研究，测定了熟料颗粒的粒度分布并分成7个粒级开展试验，首先计算出不同粒级下的临界速率及带出速率，考察了钒渣粒度对表观流化速率、停留时间分布以及钒浸出率的影响。结果表明，不同粒级的临界流化速率和停留时间差异较大，且存在显著的短路或者沟流现象，需分级处理，其中−39 μm颗粒的浸出效果最好，尾渣残钒为0.54%，钒浸出率可达94%。
- 提钒 /
- 钒渣 /
- 钙法焙烧 /
- 熟料 /
- 流态化浸出
Abstract: The fluidized leaching process of calcified vanadium slag clinker was studied in a particulate fluidized bed reactor. The particle size distribution of the clinker was determined and seven size fractions were divided for the experiments. The critical velocity and entrainment velocity of different size fractions were firstly calculated. The effects of clinker particle size on the apparent fluidization velocity, residence time and vanadium leaching rate were investigated. The results show that the critical fluidization velocity and residence time distribution of different particle size fractions are quite different, and there exists significant short circuit or channeling which needs to be treated by stages. The best vanadium leaching efficiency of 94% can be obtained for particles lower than 39 μm, with the residual vanadium content of the tailing at 0.54%.
- vanadium extracaction /
- vanadium slag /
- roasted calcium /
- clinker /
- fluidization leaching

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图 1 直管流化床结构示意

Figure 1. Structure of straight tube fluidized bed reactor

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图 2 不同粒级颗粒的流化速率

Figure 2. Fluidization velocity of different size fractions

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图 3 不同粒度颗粒的尾渣残钒和浸出率

Figure 3. Residual vanadium in tailings and vanadium leaching rate of clinkers with different particle sizes

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图 4 不同粒度颗粒的浸出液pH和钒浓度

Figure 4. pH and vanadium concentration of leaching solutions from clinkers with different particle sizes

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图 5 不同粒级颗粒的停留时间分布规律

Figure 5. Residence time distribution of particles of different size fractions

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表 1 钙化熟料主要化学成分

Table 1. Main chemical compositions of calcified vanadium slag clinker %

V₂O₅	TFe	SiO₂	MnO	TiO₂	Al₂O₃	MgO	CaO	Cr₂O₃	P₂O₅
16.10	25.50	13.77	9.17	11.52	1.52	1.86	8.16	1.91	0.13

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表 2 钙化熟料粒度分布及密度

Table 2. Particle size distribution and density of calcified vanadium slag clinker

粒度/μm	含量/%	密度/(g·cm⁻³)
+180	5.85	2.95
−180～+125	7.58	3.17
−125～+95	7.62	3.27
−95～+74	13.47	3.24
−74～+63	7.03	3.33
−63～+39	31.75	3.44
−39	26.70	3.58

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表 3 各粒级颗粒的临界流化速度和带出速度

Table 3. Critical fluidization velocity and entrainment velocity of different size fractions

粒级/μm	平均粒径/μm	临界流化速度 U_mf/(cm·s⁻¹)	带出速度 U_t/(cm·s⁻¹)
+180	180	0.47	2.31
−180～+125	150	0.37	2.02
−125～95	111	0.21	1.70
−95～+74	85	0.12	0.99
−74～+63	68	8.30×10⁻²	0.66
−63～+39	49	4.58×10⁻²	0.36
−39	39	3.00×10⁻²	0.24

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