铬铁矿无钙焙烧渣中铬的绿色提取

doi:10.19964/j.issn.1006-4990.2023-0556

Abstract

Abstract:

Calcium⁃free oxidative roasting of chromite ore and water leaching is the mainstream process of chromium salt production，but there is still a certain amount of residual chromite ore and some newly generated chromium⁃containing minerals in the chromite ore processing residue（COPR）.Research on the eco⁃friendly process of deep extraction of chromium from the COPR will be very important to the comprehensive utilization of resources.An eco⁃friendly extraction process of chromium salt from the COPR was proposed.The research results showed that the chromium could be extracted by an eco⁃friendly alkali roasting⁃water quenching process，and this new process could not only reduce the roasting reaction temperature，but also eliminate CO₂ produced in traditional roasting process.The extraction rate of chromium reached more than 92%，and the Cr（Ⅵ） in the leached chromium slag was reduced to 3.85 mg/L.The kinetics of the oxidative roasting of chromium was controlled by internal diffusion with a frequency factor A of 0.39 s^-1 and an apparent activation energy of the reaction E_a of 15.22 kJ/mol.The obtained results could provide new technical ideas for deep extraction of chromium from COPR using an eco⁃friendly process.

Key words: chromite ore, extraction of chromium, chromite ore processing residue, eco?friendly extraction

CLC Number:

TQ136.11

JIAN Chengzong, JIANG Ziwen, QUAN Xuejun, LI Gang. Eco⁃friendly extraction of chromium from calcium⁃free roasting slag of chromite ore[J]. Inorganic Chemicals Industry, 2024, 56(7): 118-125.

Figures/Tables 16

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序号	焙烧温度/℃	焙烧时间/min	烧碱用量/%	铬提取率/%
1	700	150	50	71
2	700	90	50	81
3	800	120	50	92
4	900	150	50	86
5	800	120	50	92
6	800	120	50	90
7	800	120	50	93
8	900	120	40	93
9	700	120	60	73
10	900	90	50	88
11	800	90	60	76
12	700	120	40	68
13	800	120	50	91
14	800	90	40	84
15	800	150	40	90
16	800	150	60	73
17	900	120	60	81

来源	平方和	自由度	均方差	F值	P值
模型	1 088.93	9	120.99	9.52	0.003 6
A	378.13	1	378.13	29.76	0.001 0
B	10.12	1	10.12	0.80	0.401 7
C	128.00	1	128.00	10.07	0.015 6
AB	16.00	1	16.00	1.26	0.298 8
AC	72.25	1	72.25	5.69	0.048 6
BC	20.25	1	20.25	1.59	0.247 2
A²	154.12	1	154.12	12.13	0.010 2
B²	69.06	1	69.06	5.43	0.052 5
C²	194.69	1	194.69	15.32	0.005 8
残差	88.95	7	12.71
失拟值	83.75	3	27.92	21.47	0.006 3
纯误差	5.20	4	1.30
总离差	1 177.88	16

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Inorganic Acid-Base-Salt Committee of CIESC

Eco⁃friendly extraction of chromium from calcium⁃free roasting slag of chromite ore

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References 30

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序号	焙烧温度/℃	焙烧时间/min	烧碱用量/%	铬提取率/%
1	700	150	50	71
2	700	90	50	81
3	800	120	50	92
4	900	150	50	86
5	800	120	50	92
6	800	120	50	90
7	800	120	50	93
8	900	120	40	93
9	700	120	60	73
10	900	90	50	88
11	800	90	60	76
12	700	120	40	68
13	800	120	50	91
14	800	90	40	84
15	800	150	40	90
16	800	150	60	73
17	900	120	60	81

序号	焙烧温度/℃	焙烧时间/min	烧碱用量/%	铬提取率/%
1	700	150	50	71
2	700	90	50	81
3	800	120	50	92
4	900	150	50	86
5	800	120	50	92
6	800	120	50	90
7	800	120	50	93
8	900	120	40	93
9	700	120	60	73
10	900	90	50	88
11	800	90	60	76
12	700	120	40	68
13	800	120	50	91
14	800	90	40	84
15	800	150	40	90
16	800	150	60	73
17	900	120	60	81

序号	焙烧温度/℃	焙烧时间/min	烧碱用量/%	铬提取率/%
1	700	150	50	71
2	700	90	50	81
3	800	120	50	92
4	900	150	50	86
5	800	120	50	92
6	800	120	50	90
7	800	120	50	93
8	900	120	40	93
9	700	120	60	73
10	900	90	50	88
11	800	90	60	76
12	700	120	40	68
13	800	120	50	91
14	800	90	40	84
15	800	150	40	90
16	800	150	60	73
17	900	120	60	81