铬铁矿无钙焙烧渣中铬的深度提取研究

doi:10.19964/j.issn.1006-4990.2024-0070

Abstract

Abstract:

A large amount of unreacted chromium still exists in the chromite oxidation roasting-water leaching chromium extraction residue，and the study of its in-depth extraction is of great significance for realizing the full resource utilization of chromite resources.In this study，the NaOH-NaCl system was proposed for the deep extraction of chromium from the calcium-free roasting residue of chromite，and the effects of process parameters on the extraction rate of chromium in the oxidative roasting process and the kinetics of the roasting process were investigated.The results showed that parameters such as NaCl dosage，roasting time and roasting temperature affected the extraction rate of chromium.Under the optimized conditions of sodium hydroxide of 40%， sodium chloride of 10%，chromium slag size of 100 mesh，roasting temperature of 900 ℃ and roasting time of 150 min，the chromium extraction rate reached 98%.The addition of NaOH with a low melting point promoted mass transfer，and Cl₂ generated from the decomposition of NaCl acted as a catalyst and oxidizer，providing a new idea for the efficient recovery of chromium from chromium slag.The oxidative roasting system of chromium slag in NaOH-NaCl was controlled by internal diffusion with the frequency factor A=0.026 min^-1，and the apparent activation energy of the reaction E was about 25.00 kJ/mol.The chromium slag after chromium extraction by roasting was also characterized，and the results showed that the structure of chromium slag was destroyed during roasting，and chromium was released in the spinel structure to achieve chromium extraction.

Key words: NaOH-NaCl system, chromite calcium-free roasting slag, oxidative roasting, kinetics of roasting process, chromium recovery

CLC Number:

TQ136.11

ZENG Yijun, JIANG Ziwen, JIAN Chengzong, QUAN Xuejun. Study on deep extraction of chromium from calcium-free roasting slag of chromite ore[J]. Inorganic Chemicals Industry, 2025, 57(1): 90-96.

Figures/Tables 17

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控制机理	动力学方程	反应式
液体边界层扩散控制	1-（1-x）^2/3=k₁t	（2）
化学反应控制	1-（1-x）^1/3=k₂t	（3）
内扩散控制	1+2（1-x）-3（1-x）^2/3=k₃t	（4）

温度/℃	1-（1-x）^2/3=k₁t		1-（1-x）^1/3=k₂t			1+2（1-x）-3（1-x）^2/3=k₃t
温度/℃	k₁/min^-1	R²	k₂/min^-1	R²		k₃/min^-1	R²
600	8.421 3×10^-4	0.928 3	6.212 8×10^-4	0.933 3	8.121 1×10^-4		0.950 4
700	9.698 9×10^-4	0.939 4	8.161 3×10^-4	0.943 1	0.001 2		0.953 3
800	0.001 8	0.905 2	0.001 2	0.925 6	0.001 7		0.940 9
900	0.001 1	0.946 7	0.001 3	0.958 8	0.001 9		0.965 1

样品	w（Cr₂O₃）	w（Al₂O₃）	w（SiO₂）	w（MgO）	w（Fe₂O₃）	w（其他）
样品 1	1.75	10.32	2.64	13.88	73.72	13.46
样品 2	1.73	10.26	2.65	13.58	73.75	11.71
样品 3	1.60	10.25	2.66	13.71	73.75	11.53
平均值	1.69	10.28	2.65	13.72	73.74	12.23

[1]	Qing Penghui,Dong Yuming,Wang Xingrun,Zhu Kaisheng,Niu Renjie,Meng Jingjuan,Chen Xiaohong,Chen Huixia,Zhang Hongling,Xu Hongbin. Chromium extraction and detoxification of processing residue from lime-free roasting process of chromite ore [J]. Inorganic Chemicals Industry, 2020, 52(6): 63-67.
[2]	Qing Penghui1，2，3，Zhang Hongling1，2，Shi Yilang4，Cai Zaihua4，Mei Haijun5，Xu Hongbin1，2. Effect of additive on oxidative roasting process of chromite [J]. Inorganic Chemicals Industry, 2019, 51(12): 26-29.

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Inorganic Acid-Base-Salt Committee of CIESC

Study on deep extraction of chromium from calcium-free roasting slag of chromite ore

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