石灰石干法制备高性能氢氧化钙的工艺及应用研究

doi:10.19964/j.issn.1006-4990.2022-0712

Abstract

Abstract:

Dry digestion process of calcium hydroxide production is simple，with high production efficiency and good desulfurization effect.However，calcium hydroxide produced from ore as raw material still needs to be improved in terms of purity and specific surface area.In order to prepare high-performance calcium hydroxide by dry digestion，the limestone of a mine was used as raw material，and the effects of water-cement ratio，reaction time，reaction temperature，additives and digestion mode on the performance of calcium hydroxide were investigated.The samples were characterized by specific surface area analyzers，XRD，SEM，and FT-IR.The results showed that the calcium hydroxide prepared under the conditions of water-cement ratio of 0.5，the reaction time of 40 min，the reaction temperature of 40 ℃，and three times of digestion with 4%（mass fraction）PEG400 had the best performance with a CaO hydration rate of 95.28%，a Ca（OH）₂purity of 93.91%，a Ca（OH）₂specific surface area of 52.62 m²/g and a Ca（OH）₂stomatal capacity of 0.163 cm³/g.This study provided a theoretical basis for the preparation of high-performance calcium hydroxide.

Key words: limestone, dry process, calcium hydroxide, multi-stage digestion

CLC Number:

TQ132.32

LIU Yue, ZHENG Qiang, XING Jiabin, XING Run, MA Yali, JIA Songyan, LI Xue. Study on process and application of high-performance calcium hydroxide prepared by dry digestion from limestone[J]. Inorganic Chemicals Industry, 2023, 55(10): 42-49.

Figures/Tables 16

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编号	煅烧时间/ min	煅烧温度/ ℃	质量损失率/ %
1	30	850	35.04
2	40	850	37.30
3	50	850	39.16
4	60	850	41.56
5	70	850	42.76
6	80	850	42.84
7	90	850	42.82
8	100	850	42.54
9	110	850	42.18
10	120	850	41.78

编号	水灰比	温度/ ℃	反应时间/min	CaO水化率/%	Ca（OH）₂ 纯度/%	比表面积/ （m²∙g^-1）	气孔容量/ （cm³∙g^-1）
1	0.3	25	20	65.07	67.31	16.54	0.047
2	0.4	25	20	70.26	75.26	28.89	0.077
3	0.5	25	20	81.13	83.31	33.48	0.117
4	0.6	25	20	75.45	82.68	30.75	0.109
5	0.7	25	20	73.33	78.19	30.63	0.103

编号	水灰比	温度/ ℃	反应时间/min	CaO水化率/%	Ca（OH）₂ 纯度/%	比表面积/ （m²∙g^-1）	气孔容量/ （cm³∙g^-1）
1	0.5	25	20	81.13	83.31	33.48	0.117
2	0.5	25	30	81.58	84.01	34.36	0.121
3	0.5	25	40	82.69	84.21	34.54	0.121
4	0.5	25	50	82.74	84.23	34.65	0.120
5	0.5	25	60	82.96	84.33	35.35	0.117
6	0.5	25	70	82.87	83.96	34.56	0.115
7	0.5	25	80	82.35	83.64	33.06	0.117
8	0.5	25	90	81.84	84.05	33.75	0.118

编号	水灰比	温度/ ℃	反应时间/min	CaO水化率/%	Ca（OH）₂ 纯度/%	比表面积/ （m²∙g^-1）	气孔容量/ （cm³∙g^-1）
1	0.5	25	40	82.69	84.21	34.54	0.121
2	0.5	30	40	87.51	88.01	39.48	0.141
3	0.5	40	40	92.81	92.21	41.91	0.146
4	0.5	50	40	90.09	90.23	37.73	0.143
5	0.5	60	40	84.55	87.33	32.72	0.138
6	0.5	70	40	82.02	83.96	32.67	0.129

编号	添加剂	添加量/%	消化方式	CaO水化率/%	Ca（OH）₂ 纯度/%	比表面积/ （m²∙g^-1）	气孔容量/ （cm³∙g^-1）
1	无	0	1次消化	92.81	92.21	41.91	0.146
2	PEG400	2	1次消化	94.39	93.31	43.17	0.147
3	PEG400	3	1次消化	94.11	93.08	45.37	0.150
4	PEG400	4	1次消化	94.92	93.86	46.61	0.151
5	PEG400	5	1次消化	94.97	93.47	47.72	0.149
6	无	0	2次消化	95.01	93.52	43.69	0.148
7	PEG400	2	2次消化	95.31	93.37	46.67	0.153
8	PEG400	3	2次消化	95.41	93.67	47.39	0.154
9	PEG400	4	2次消化	95.52	93.86	48.89	0.157
10	PEG400	5	2次消化	95.57	94.06	50.81	0.153
11	PEG400	2	3次消化	95.34	93.78	48.42	0.154
12	PEG400	4	3次消化	95.28	93.91	52.62	0.163

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Inorganic Acid-Base-Salt Committee of CIESC

Study on process and application of high-performance calcium hydroxide prepared by dry digestion from limestone

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