钛精矿酸解尾气中升华硫的产生规律及其减排方法

doi:10.19964/j.issn.1006-4990.2023-0542

Abstract

Abstract:

Acidolysis of titanium concentrate is a key step in manufacturing the titanium dioxide by sulfate process.However，the sublimed sulfur formed by the cooling and condensation of elemental sulfur in the acidolysis exhaust gas is easy to clog on the exhaust pipe，which seriously affects the normal production of titanium dioxide.Therefore，it is of great theoretical and practical significance to systematically study the emission reduction of sublimed sulfur production for the continuous manufacture of titanium dioxide by sulfate process.In this work，the occurrence state of S in titanium concentrate was characterized and analyzed.The production mechanism of sublimed sulfur in acidolysis exhaust gas was discussed，and the change laws of sublimed sulfur production were explored through experiments.The results showed that sublimed sulfur in the exhaust gas was mainly formed by reaction between pyrrhotite in titanium concentrate and concentrated sulfuric acid，and the manufacture parameters such as reaction time，reaction temperature and sulfuric acid concentration could affect the weight of sublimed sulfur.At the same time，it was found that increasing the air content in the acidolysis material could reduce the production of sublimed sulfur without affecting the acidolysis rate of titanium concentrate.The experiments showed that when the reaction time was 30 min，the reaction temperature was 180 ℃，the stirring rate was 100 r/min，the concentration of reactive acid was 85%，the particle size of mineral was 48~75 μm，and the air flow rate in the material was 80 mL/min，the weight of sublimed sulfur in acidolysis exhaust gas was reduced by more than 35%.

Key words: acidolysis exhaust gas, sublimed sulfur, titanium concentrate, titanium dioxide of sulfate process

CLC Number:

TQ134.11

XIANG Quanjin, QUAN Xuejun, LI Li, WANG Haibo, CHEN Xinhong, LI Ping. Formation rules and emission reduction method of sublimed sulfur in acidolysis exhaust gas of titanium concentrate[J]. Inorganic Chemicals Industry, 2024, 56(7): 96-103.

Figures/Tables 16

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矿物	w （Al）	w （Ca）	w （Fe）	w （Mg）	w （Mn）	w （S）	w （Ti）
钛铁矿	13.78	11.84	93.16	82.30	71.61	0.00	97.30
磁铁矿	6.71	0.00	3.37	1.46	0.00	0.00	0.45
钛闪石	15.19	29.11	0.52	3.24	6.65	0.00	0.40
绿泥石	30.10	1.06	0.88	7.30	0.00	0.00	0.17
榍石	1.13	16.46	0.05	0.02	0.00	0.00	0.34
镁橄榄石	0.77	0.01	0.16	2.61	2.17	0.00	0.01
透辉石	0.38	4.28	0.04	0.38	0.00	0.00	0.01
钙长石	2.27	4.50	0.02	0.01	0.00	0.00	0.00
磁铁矿+绿泥石	1.77	2.54	0.51	0.67	2.52	0.00	0.12
辉石	1.19	2.03	0.07	0.20	0.80	0.00	0.01
白云母	3.63	0.33	0.02	0.03	0.00	0.00	0.00
黑金红石	0.18	0.12	0.02	0.02	0.00	0.00	0.18
钛铁矿+石灰	0.23	8.12	0.25	0.42	0.00	0.00	0.30
微斜长石	4.78	3.56	0.01	0.00	0.00	0.00	0.00
钛铁矿+金	0.00	0.00	0.01	0.00	0.00	0.00	0.01
刚玉	7.54	0.00	0.01	0.00	0.00	0.00	0.01
铁板钛矿	0.00	0.00	0.00	0.00	0.04	0.00	0.00
钛铁矿+绿泥石	2.26	9.22	0.35	0.00	9.95	0.00	0.52
钠长石	0.50	0.00	0.00	0.00	0.00	0.00	0.01
磁黄铁矿	0.00	0.00	0.13	0.00	0.00	36.83	0.00
镁铝尖晶石	2.79	0.00	0.02	0.26	0.00	0.00	0.00
磷酸钙	0.00	5.36	0.00	0.00	0.00	0.00	0.00
钙钛矿	0.00	1.04	0.00	0.00	0.00	0.00	0.03
黑云母	0.10	0.00	0.00	0.03	0.00	0.00	0.00
镁铁硫酸盐	0.17	0.00	0.02	0.09	0.00	6.55	0.00
石英	0.00	0.00	0.00	0.00	0.00	0.00	0.00
黄铁矿	0.00	0.00	0.11	0.00	0.00	56.62	0.01
铝硅酸盐	1.02	0.00	0.00	0.00	0.00	0.00	0.00
单质铁	0.07	0.00	0.10	0.00	0.00	0.00	0.01
绿泥石+钛铁矿	2.34	0.38	0.12	0.79	0.00	0.00	0.12
含铁刚玉	1.05	0.00	0.02	0.03	0.55	0.00	0.00
顽火辉石	0.02	0.00	0.00	0.14	0.00	0.00	0.00
二氧化钛+锰铁尖晶石	0.00	0.02	0.01	0.00	5.71	0.00	0.01
总计	100	100	100	100	100	100	100

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[2]	MA Guang-Qiang, ZOU Min, XIA Dong. Experimental study on titanium concentrate leaching to prepare Ti-rich material with titanium dioxide waste acid [J]. INORGANICCHEMICALSINDUSTRY, 2016, 48(8): 67-.
[3]	MA Wei-Ping. Research on acidolysis of Panxi titanium concentrate with sulfuric acid [J]. INORGANICCHEMICALSINDUSTRY, 2013, 45(5): 24-.

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Inorganic Acid-Base-Salt Committee of CIESC

Formation rules and emission reduction method of sublimed sulfur in acidolysis exhaust gas of titanium concentrate

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