响应曲面法优化污泥/粉煤灰复合陶粒滤料的制备

doi:10.19964/j.issn.1006-4990.2021-0750

Abstract

Abstract:

The ceramsite filter media was fired by sludge，fly ash and waste glass as raw materials and supplemented with sodium silicate as binder.Based on single?factor experiment，the effect of preheating temperature，sintering temperature，sintering time and their interaction on the performance of composite ceramsite filter materials were investigated by using optimization with Box-Behnken response surface method.The results showed that the mathematical model established by the response surface had a high degree of fit.The interaction among the three factors of preheating temperature，sintering temperature and sintering time had significant effect on the water absorption rate.Sintering time was the most important affecting factor.Under the condition that the mass ratio of sludge，fly ash and waste glass was 4∶3∶3，supplemented by 3%（by mass fraction） binder，the preheating temperature was 500 ℃，the preheating time was 20 min，the sintering temperature was 1 133 ℃，and the sintering time was 23 min，the ceramsite filter material that met the requirements of CJ/T 299—2008 “artificial ceramsite filter material for water treatment”could be prepared.Compared with other ceramsite，sludge or fly ash composite ceramsite filter material had the advantages of low density and high?water absorption rate，which was suitable for water treatment filter material and artificial wetland filler.

Key words: response surface methodology, ceramsite filler materials, water absorption rate, particle apparent density

CLC Number:

X703

FANG Weicheng,CHENG Xingxing,SUN Changrong. Optimization of preparation of sludge/fly ash composite ceramsite filler materials by response surface methodology[J]. Inorganic Chemicals Industry, 2022, 54(9): 119-125.

Figures/Tables 11

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References 22

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原料	主要成分质量分数/％
原料	Na₂O	MgO	Al₂O₃	SiO₂	K₂O	CaO	Fe₂O₃	P₂O₅	其他
污泥	1.084	4.746	32.883	17.994	3.455	11.631	6.237	13.375	8.595
粉煤灰	0.767	2.355	29.355	48.193	3.409	8.761	5.640	0.246	1.274
废玻璃	10.123	2.342	2.043	77.443	0.353	6.376	0.764	0.101	0.455

m（污泥）∶m（粉煤灰）∶ m（废玻璃）	质量分数/%
m（污泥）∶m（粉煤灰）∶ m（废玻璃）	Na₂O	MgO	Al₂O₃	SiO₂	K₂O	CaO	Fe₂O₃	其他
4∶3∶3	3.701	3.308	22.573	44.888	2.511	9.194	4.416	8.595
3∶4∶3	3.669	3.068	22.220	47.908	2.506	8.907	4.356	1.274
2∶4∶4	4.573	2.828	19.136	53.853	2.196	8.381	3.809	5.224
3∶3∶4	4.605	3.067	19.489	50.833	2.200	8.668	3.869	7.269

序号	自变量水平			因变量 Y（吸水率/%）
序号	A（预热温度/℃）	B（烧结温度/℃）	C（烧结时间/min）	因变量 Y（吸水率/%）
1	1（600）	-1（1 100）	0（20）	6.14
2	1（600）	0（1 150）	-1（10）	5.44
3	0（500）	0（1 150）	0（20）	6.69
4	0（500）	1（1 200）	1（30）	4.88
5	0（500）	-1（1 100）	-1（10）	4.32
6	1（600）	0（1 150）	1（30）	5.88
7	-1（400）	0（1 150）	-1（10）	5.25
8	0（500）	0（1 150）	0（20）	6.62
9	-1（400）	1（1 200）	0（20）	5.88
10	0（500）	-1（1 100）	1（30）	6.58
11	0（500）	0（1 150）	0（20）	6.88
12	-1（400）	0（1 150）	1（30）	5.68
13	0（500）	0（1 150）	0（20）	6.76
14	-1（400）	-1（1 100）	0（20）	5.54
15	1（600）	1（1 200）	0（20）	5.16
16	0（500）	0（1 150）	0（20）	6.74
17	0（500）	1（1 200）	-1（10）	5.98

项目	ρ（Cr）/ （mg·L^-1）	ρ（Cu）/ （mg·L^-1）	ρ（Cd）/ （mg·L^-1）	ρ（Zn）/ （mg·L^-1）
污泥	0.147	0.813	—	0.430
粉煤灰	0.073	0.078	0.001	0.210
废玻璃	0.013	—	—	—
陶粒	0.028	0.011	—	0.005
限值	≤15	≤100	≤1	≤100

陶粒	表观密度/ （g·cm^-3）	吸水率（1 h）/%	比表面积/ （m²·g^-1）	破碎率与磨损率之和/%	盐酸可溶率/%
行业标准	越小越好	≤10	≥0.5	≤6	≤2
复合陶粒滤料	0.650	6.91	4.87	0.82	0.08
给水污泥陶粒^[1]	1.390	23.65	5.24	—	0.25
高强陶粒滤料^[22]	0.947	3.60	—	—	—
污泥陶粒^[10]	0.996	0.12	—	—	—
河道底泥陶粒^[17]	1.155	36.68	—	0.78	—

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Optimization of preparation of sludge/fly ash composite ceramsite filler materials by response surface methodology

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