利用含锰硅胶低温制备钾水玻璃

doi:10.19964/j.issn.1006-4990.2021-0478

Abstract

Abstract:

Using manganese-containing silica gel by?product as raw material，manganese?containing silica gel was prepared to potassium water glass solution by activation oxidation method，and manganese ions in the solution were removed at the same time.The manganese?containing silica gel activated at 100 ℃ for 2 h was mixed with industrial potassium hydroxide and deionized water in a reaction kettle.The mixture was stirred to form a slurry in 10 min at 65 ℃.The industrial hydrogen peroxide solution was added into reaction kettle within 1 h at a constant speed，and the reaction was completed after 30 min.The colorless，transparent and capable of rapid solid?liquid separation potassium water glass solution with mass fraction of 15%~26%，modulus of 0.8~1.5，and Mn of less than 5×10^-5 and MnO _x filter residue were obtained.The phase analysis of the filter residue detected by XRD.It was found that the content of MnO₂ and Mn₅O₈ in the filter residue were 76.3% and 23.7%.This work not only solved the problem of comprehensive utilization of by?product manganese?containing silica gel，but also realized the recycling of manganese and silicon resources.

Key words: manganese?containing silica, potassium water glass, low temperature, manganese removal

CLC Number:

TQ127.2

ZHANG Ji,NING Yansheng,GUO Xifeng,ZHU Jianping,WANG Kuo. Preparation of potassium water glass using manganese?containing silica gel at low temperature[J]. Inorganic Chemicals Industry, 2022, 54(5): 126-130.

Figures/Tables 8

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Table 1

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References 15

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实验编号	m（KOH）/g	m （H₂O）/g	m（含锰硅胶）/g	m （H₂O₂）/g	H₂O₂投料速度/ （g·min^-1）	反应时间/min
2-2-1	140	187	83	10	0.10	100
2-2-2	140	187	83	10	0.35	100
2-2-3	140	187	83	10	0.60	100
2-2-4	140	187	83	10	0.85	100
2-2-5	140	187	83	10	1.10	100

实验编号	m （KOH）/ g	m （H₂O）/ g	m （含锰硅胶）/g	m （H₂O₂）/ g	质量分数/ %	理论硅钾比	H₂O₂投料速度/ （g·min^-1）	反应时间/min
2-3-1	140	150	50	10	24	0.40	0.60	100
2-3-2	140	171	100	10	24	0.80	0.60	100
2-3-3	140	192	150	10	24	1.20	0.60	100
2-3-4	140	213	200	10	24	1.60	0.60	100
2-3-5	140	234	250	10	24	2.00	0.60	100

实验编号	过滤时间/s（以100 g计）	w （Mn）/10^-6	H₂O₂投料期间温度/℃	除锰率/ %
2-2-1	19.6	542.4	50~55	90.9
2-2-2	17.0	160.3	52~58	97.3
2-2-3	13.4	23.5	63~68	99.6
2-2-4	25.2	477.8	65~72	92.0
2-2-5	34.2	940.8	70~76	84.2

实验编号	w （K₂O）/%	w （SiO₂）/%	硅钾比	过滤时间（以100 g计）/s	w （Mn）/10^-6	除锰率/%
2-3-1	19.1	4.8	0.39	7.2	12.5	99.8
2-3-2	15.8	8.1	0.80	11.5	22.3	99.6
2-3-3	13.7	10.4	1.19	16.0	43.2	99.3
2-3-4	12.0	11.9	1.56	19.9	377.2	93.7
2-3-5	10.4	13.1	1.98	34.4	1 490.0	74.9

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Preparation of potassium water glass using manganese?containing silica gel at low temperature

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