富镁镍渣-粉煤灰基地质聚合物的制备及性能

doi:10.19964/j.issn.1006-4990.2023-0101

Abstract

Abstract:

The improvement of the activation treatment on the activity of high-magnesium nickel slag was investigated by introducing MgO in high-magnesium nickel slag and remelting it with water quenching，and the engineering performance and hydration products of activated high-magnesium nickel slag as cementitious material were studied using water glass as the activator.The results showed that the compressive strength of high-magnesium nickel slag based geopolymer after activation treatment could reach 35.60 MPa，which was 60.7% higher than that of untreated high-magnesium nickel slag-based geopolymer.The factors affecting the compressive strength of geopolymers in order of predominance were water glass dosing，m（high-magnesium nickel slag）∶m（fly ash），and water glass modulus.The main hydration products were sodium-magnesium-aluminum silicate gel（N-M-A-S-H），and a small portion of aluminosilicate and hydrated calcium silicate，etc，without Mg（OH）₂.A large number of gelling phases such as N-M-A-S-H wrapped around unreacted FA，etc.to form a dense gel-crystal phase structure.This study provided some guidance for the practical application of high-magnesium nickel slag as raw material for the preparation of geopolymers，and provided a new idea for improving the pozzolanic activity of slag.

Key words: high-magnesium nickel slag, activation treatment, geopolymer, N-M-A-S-H, fly ash

CLC Number:

TQ132.2

SUN Zhigao, WU Yuan, YANG Xingchun, ZHANG Dongliang, WANG Mitang. Preparation and properties of high-magnesium nickel slag-fly ash based geopolymer[J]. Inorganic Chemicals Industry, 2023, 55(11): 139-146.

Figures/Tables 18

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References 30

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水平	因素
水平	A ［m（W-HMNS）∶m（FA）］	B ［w（水玻璃）/%］	C （水玻璃模数）
1	8∶2	10	1.0
2	7∶3	15	1.2
3	6∶4	20	1.4

编号	A	B	C	水灰比
S1	1	1	1	0.24
S2	1	2	2	0.24
S3	1	3	3	0.24
S4	2	1	2	0.24
S5	2	2	3	0.24
S6	2	3	1	0.24
S7	3	1	3	0.24
S8	3	2	1	0.24
S9	3	3	2	0.24

编号	A	B	C	抗压强度/MPa
编号	A	B	C	3 d	7 d	28 d
S1	1	1	1	0.92	1.16	1.76
S2	1	2	2	3.36	5.32	8.00
S3	1	3	3	11.20	12.80	15.20
S4	2	1	2	1.40	1.64	1.92
S5	2	2	3	13.60	16.80	26.40
S6	2	3	1	2.56	4.08	8.00
S7	3	1	3	1.96	2.72	2.84
S8	3	2	1	2.56	4.58	5.20
S9	3	3	2	8.80	16.4	28.40

因素	K₁/MPa	K₂/MPa	K₃/MPa	R/MPa
A	8.32	12.11	12.08	3.79
B	2.17	13.20	17.13	14.96
C	4.99	12.71	14.81	9.82

编号	A	B	C	线性膨胀率/%
编号	A	B	C	3 d	7 d	28 d
S1	1	1	1	3.0	3.0	2.5
S2	1	2	2	5.5	5.0	3.0
S3	1	3	3	5.9	5.5	5.0
S4	2	1	2	3.9	4.0	4.0
S5	2	2	3	5.0	2.5	2.5
S6	2	3	1	5.6	3.0	4.0
S7	3	1	3	3.5	3.0	2.0
S8	3	2	1	2.5	5.0	3.0
S9	3	3	2	3.9	3.9	3.3

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation and properties of high-magnesium nickel slag-fly ash based geopolymer

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因素	K₁/%	K₂/%	K₃/%	R/%
A	3.5	3.5	2.8	0.7
B	2.8	3.3	4.1	1.3
C	3.2	3.4	3.2	0.2