原状煤矸石骨料强化工艺研究

doi:10.11962/1006-4990.2019-0489

Abstract

Abstract:

The original coal gangue in Tongchuan,Shaanxi Province was taken as the research object.Through the processing of sorting,crushing and grading etc.,the experiments on chemical strengthening and surface coating of coal gangue were em-phasized.In this study,coal gangue with the particle size of 2.36~4.75 mm was selected.The strength and water resistance of coal gangue were improved with different strengthening agents and coated powder.It was found that when the solution was compounded with 0.7% soil solidified agent in a mass fraction of 6% silicate-based strengthening agent B,the strengthening effect on coal gangue was the most obvious.The surface of the coal gangue after liquid strengthening was covered with a mass ratio of cement to tailings powder of 1:1.2,The amount of coating was 25% of the mass of coal gangue.The dry crush value of the obtained product can be reduced by about 50%,the water resistance performance was improved by about 85%,and the produced coal gangue aggregate product performance was well.The coal gangue aggregate product was replaced by a part of the stone as a cement mortar aggregate.Compared with the original gangue cement mortar,the reinforced coal gangue cement mortar has improved flexural strength and compressive strength.

Key words: coal gangue, crushing value, water resistance, liquid strengthener, cover treatment

CLC Number:

TQ536

Liu Xiaoting,Wen Jiuran,Wang Siyu,Liu Kaiping,Gao Ni,Zhong Jiaqiang. Study on strengthening technology of raw coal gangue aggregate[J]. Inorganic Chemicals Industry, 2020, 52(4): 65-71.

Figures/Tables 19

References 14

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编号	粉体名称	粘结剂配方	水与粉的质量比
A	快凝型修补材料	自来水	0.28
B	硅酸盐防水材料	自来水+0.5%木质素磺酸钠减水剂	0.28
C	水泥+某尾矿矿粉	自来水+0.5%木质素磺酸钠减水剂	0.28

强化剂种类	最佳质量分数/%	最小压碎值/%	压碎值平均降低量/%	压碎值最大降低量/%
硅溶胶	16	28.02	10.24	26.09
树脂类强化剂	10	26.43	21.93	30.28
硅酸盐类强化剂 A	2	30.57	19.36	19.36
硅酸盐类强化剂 B	6	25.26	30.25	32.42

强化剂种类	最佳质量分数/%	最小压碎值/%	压碎值平均降低量/%	压碎值最大降低量/%
硅溶胶	16	24.48	5.59	10.36
树脂类强化剂	6	21.55	14.08	21.09
硅酸盐类强化剂 A	2	26.92	—	1.43
硅酸盐类强化剂 B	6	26.55	—	2.8

编号	种类	拟合公式	R²
A	快凝型修补材料	Y₁=27.243 93-164.343 57x+ 350.357 14x²	0.995 96
B	硅酸盐类防水材料	Y₂=26.753 57-155.707 14x+ 552.428 57x²	0.891 54
C	水泥+尾矿	Y₃=25.327 86-183.701 42x+ 448.428 57x²	0.870 23

水平	因素
水平	硅酸盐类强化剂B 质量分数/%（A）	土壤固化剂掺量/% （B）
1	5	0.5
2	6	0.6
3	7	0.7

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Inorganic Acid-Base-Salt Committee of CIESC

Study on strengthening technology of raw coal gangue aggregate

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序号	因素 A	因素 B	压碎值/ %	序号	因素 A	因素 B	压碎值/ %
1	1	1	25.71	8	3	2	20.96
2	1	2	24.96	9	3	3	20.18
3	1	3	23.26	k₁	24.64	23.17
4	2	1	21.59	k₂	21.37	22.57
5	2	2	21.78	k₃	21.11	21.39
6	2	3	20.73	R	3.53	1.78
7	3	1	22.20

灰砂质量比	相同流动度下所需水灰比	7d抗折强度/MPa	7d抗压强度/MPa	高效聚羧酸减水剂用量/%
1:0.5	0.50	2.74	24.71	1
1:0.6	0.43	4.19	34.87	1
1:0.8	0.36	4.63	38.36	1
1:1.0	0.32	5.83	41.71	1
1:1.2	0.30	5.54	46.75	1
1:1.4	0.26	7.74	43.93	1

骨料种类	P.O42.5水泥	标准砂	细集料（2.36 mm~4.75 mm）	水灰比	高效聚羧酸减水剂掺量/%
对照组（未掺煤矸石）	1	1	1.5	0.3	1
原状煤矸石（RCG）	1	1	1.5	0.3	1
液体强化煤矸石（LCG）	1	1	1.5	0.3	1
液体强化+固体包覆处理（CCG）	1	1	1.5	0.3	1

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