磷石膏转晶制备α型高强石膏工艺条件的优化研究

doi:10.19964/j.issn.1006-4990.2022-0010

摘要/Abstract

摘要：

以工业固体废弃物磷石膏为原料，采用半液相蒸压法制备α型高强石膏。以蒸压温度、蒸压时间、1#转晶剂、2#转晶剂以及料浆含水率为因素，进行了5因素4水平的正交实验。以力学性能为指标，对磷石膏转晶制备α型高强石膏的工艺条件进行了优化研究。结果表明，在反应温度为137 ℃、料浆含水率为20%（质量分数）、1#转晶剂用量为0.3%（质量分数）、2#转晶剂用量为1.27%（质量分数）、反应恒温时间为20 min时，可以制得2 h抗折强度、2 h抗压强度以及绝干抗压强度分别达7.0、21.7、44.7 MPa的α型高强石膏。

关键词: 磷石膏, α型高强石膏, 转晶

Abstract:

Based on industrial solid waste phosphogypsum as raw material，α high-strength gypsum was prepared by semi-liquid autoclave method.By taking autoclave temperature，autoclave time，1# crystal conversion agent，2# crystal conversion agent and slurry moisture content as factors，an orthogonal test of 5 factors and 4 levels was carried out.By taking the mechanical properties as an index，the process conditions for the preparation of α high-strength gypsum by crystal conversion were optimized. The results showed that when the reaction temperature was 137 ℃，the slurry moisture content was 20%（mass fraction），the dosage of 1# crystallizing agent was 0.3%（mass fraction），the dosage of 2# crystallizing agent was 1.27%（mass fraction），and the constant temperature of reaction was 20 min，α high-strength gypsum with 2 h flexural，2 h compressive and dry compressive strengths of 7.0，21.7 and 44.7 MPa could be prepared，respectively.

Key words: phosphogypsum, α high-strength gypsum, crystal conversion

中图分类号:

X781.5

曾映,晏波,阮运春,张涛,田仁道,胡宏,聂登攀. 磷石膏转晶制备α型高强石膏工艺条件的优化研究[J]. 无机盐工业, 2022, 54(11): 112-117.

ZENG Ying,YAN Bo,RUAN Yunchun,ZHANG Tao,TIAN Rendao,HU Hong,NIE Dengpan. Study on optimization of technological conditions for preparing α high-strength gypsum from phosphogypsum by crystal conversion[J]. Inorganic Chemicals Industry, 2022, 54(11): 112-117.

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编号	A	B	C	D	E	2 h抗折强度/MPa	2 h抗压强度/MPa	绝干抗折强度/MPa	绝干抗压强度/MPa
L1	1	1	1	1	1	4.9	15.4	10.8	36.1
L2	1	2	2	2	2	1.4	3.5	3.0	6.8
L3	1	3	3	3	3	2.7	8.7	7.0	19.5
L4	1	4	4	4	4	1.0	2.5	4.2	8.5
L5	2	1	2	3	4	5.0	15.8	10.3	34.1
L6	2	2	1	4	3	7.0	21.7	12.3	44.7
L7	2	3	4	1	2	1.4	4.6	5.8	16.3
L8	2	4	3	2	1	2.4	8.4	7.0	26.8
L9	3	1	3	4	2	3.0	9.8	7.9	24.4
L10	3	2	4	3	1	4.8	20.3	10.4	32.4
L11	3	3	1	2	4	1.1	3.7	5.0	17.4
L12	3	4	2	1	3	3.0	10.3	8.4	31.1
L13	4	1	4	2	3	1.5	4.8	5.2	17.9
L14	4	2	3	4	1	2.0	7.3	7.7	22.8
L15	4	3	2	4	1	4.5	17.0	9.1	37.1
L16	4	4	1	3	2	6.3	19.5	10.9	41.3

水平	2 h抗折强度/MPa					2 h抗压强度/MPa
水平	A	B	C	D	E	A	B	C	D	E
K₁	2.500	3.600	4.825	2.825	4.150	7.525	11.450	15.075	9.400	15.275
K₂	3.950	3.800	3.475	1.600	3.025	12.625	13.200	11.650	5.100	9.350
K₃	2.975	2.425	2.525	4.700	3.550	11.025	8.500	8.550	16.075	11.375
K₄	3.575	3.175	2.175	3.875	2.275	12.150	10.175	8.050	12.750	7.325
R	1.450	1.375	2.650	3.100	1.875	5.100	4.700	7.025	10.975	7.950

w（2#转晶剂）/%	实验编号	2 h抗折强度/MPa	2 h抗压强度/MPa	绝干抗折强度/MPa	绝干抗压强度/MPa
1.07	L1	4.9	15.4	10.8	36.1
	L7	1.4	4.6	5.8	16.3
	L12	3.0	10.3	8.4	31.1
	L14	2.0	7.3	7.7	22.8
1.17	L2	1.4	3.5	3.0	6.8
	L8	2.4	8.4	7.0	26.8
	L11 L13	1.1 1.5	3.7 4.8	5.0 5.2	17.4 17.9
1.27	L3	2.7	8.7	7.0	19.5
	L5	5.0	15.8	10.3	34.1
	L10	4.8	20.3	10.4	32.4
	L16	6.3	19.5	10.9	41.3
1.37	L4	1.0	2.5	4.2	8.5
	L6	7.0	21.7	12.3	44.7
	L9	3.0	9.8	7.9	24.4
	L15	4.5	17.0	9.1	37.1

w（1#转晶剂）/%	实验编号	2 h抗折强度/MPa	2 h抗压强度/MPa	绝干抗折强度/MPa	绝干抗压强度/MPa
0.3	L1	4.9	15.4	10.8	36.1
	L6	7.0	21.7	12.3	44.7
	L10	4.8	20.3	10.4	32.4
	L16	6.3	19.5	10.9	41.3
0.4	L5	5.0	15.8	10.3	34.1
	L12	3.0	10.3	8.4	31.1
	L15	4.5	17.0	9.1	37.1
0.5	L3	2.7	8.7	7.0	19.5
	L8	2.4	8.4	7.0	26.8
	L9	3.0	9.8	7.9	24.4
	L14	2.0	7.3	7.7	22.8
0.6	L4	1.0	2.5	4.2	8.5
	L7	1.5	4.6	5.8	16.3
	L11	1.1	3.7	5.0	17.4
	L13	1.5	4.8	5.2	17.9

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