钛石膏中铁浸出动力学及其酸浸循环工艺研究

doi:10.19964/j.issn.1006-4990.2023-0141

Abstract

Abstract:

During the process of preparing titanium dioxide powder using sulfuric acid method，titanium dioxide waste acid and titanium gypsum are generated.A waste treatment approach is adopted，using titanium dioxide waste acid as a leaching agent to recycle and leach iron impurities from titanium gypsum，in order to achieve effective utilization of resources.The optimum process conditions for the cyclic acid leaching of titanium gypsum with titanium white waste acid were investigated.The experimental results showed that the iron removal efficiency of titanium gypsum could reach more than 80% at reaction temperature of 333.15 K，liquid-to-solid mass ratio of 5∶1，reaction time of 60 min and two times of cyclic acid leaching.The titanium gypsum products before and after acid leaching were compared and analyzed based on SEM，XRF，XRD and other characterization results.The results showed that the acid leaching conditions could reduce the content of various impurity components in titanium gypsum，and the composition of the physical phase of titanium gypsum before and after acid leaching was CaSO₄·2H₂O.On the basis of the above research，the complete titanium gypsum treatment process was formed.The leaching characteristics of elemental iron in titanium gypsum under the titanium dioxide waste acid system were investigated，and fitted and calculated using a leaching kinetic model.The results showed that the leaching process was controlled by internal diffusion and the apparent activation energy of the reaction was 59.08 kJ/mol.

Key words: titanium gypsum, titanium dioxide waste acid, leaching kinetic, activation energy

CLC Number:

TQ177.39

XIANG Mengqi, MENG Hua, WANG Ye, MENG Xianzhang, BAI Yuhang, WANG Yujunyao, ZHANG Yidan. Study on kinetic of iron leaching from titanium gypsum and its cyclic acid leaching process[J]. Inorganic Chemicals Industry, 2024, 56(1): 114-120.

Figures/Tables 14

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	应用方向	优点	缺点
不除铁利用	水泥缓释剂	成本低，现今主要消纳方式	附加值低，水泥掺量有限（5%）
	路基材料	成本低，消纳较大	暂无标准，水泥掺量有限（10%）
	复合胶凝材料	成本低，用量大	力学性能稍显不足
	土壤改性剂	成本低	附加值低
	生态复合肥	成本低	附加值较高，技术尚不成熟
除铁利用	二水β石膏	可在废酸中和时分级制备	附加值一般
	半水β石膏	附加值提高，可作胶凝材料	除铁、烘干成本有所增加
	半水α石膏	附加值高，可作建筑材料	除铁、转晶成本较高
	石膏晶须	附加值高，可作增强耐磨材料	除铁、转晶成本较高

T/K	化学反应控制		反应物内部扩散控制		Logarithmic 速率控制		可逆的晶化过程控制
T/K	ln k	R²	ln k	R²	ln k	R²	ln k	R²
313.15	0.974 32	9.225 80	0.974 02	9.930 96	0.974 47	9.016 36	0.883 53	0.836 95
323.15	0.970 86	8.592 85	0.970 87	9.286 53	0.970 84	8.387 70	0.893 82	0.747 43
333.15	0.965 31	8.026 98	0.964 25	8.727 23	0.966 35	7.813 90	0.994 09	0.900 54
343.15	0.966 89	7.159 67	0.960 31	7.908 44	0.971 89	6.907 76	0.980 07	3.340 20

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Inorganic Acid-Base-Salt Committee of CIESC

Study on kinetic of iron leaching from titanium gypsum and its cyclic acid leaching process

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