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Gold Science and Technology ›› 2020, Vol. 28 ›› Issue (5): 658-668.doi: 10.11872/j.issn.1005-2518.2020.05.127

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Preparation and Performance of Aluminosilicate Based Solid Waste Cemen-titious Materials

Zhiyuan YE1,2(),Qianqian WANG1,2()   

  1. 1.College of Materials Science and Engineering，Nanjing Tech University，Nanjing 211816，Jiangsu，China
    2.State Key Laboratory of Materials-Oriented Chemical Engineering，Nanjing Tech University，Nanjing 211816，Jiangsu，China
  • Received:2020-07-16 Revised:2020-08-18 Online:2020-10-31 Published:2020-11-05
  • Contact: Qianqian WANG E-mail:201861203117@njtech.edu.cn;qqwang@njtech.edu.cn

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Abstract:

The metallurgical and coal power industries produce a large amount of solid wastes，such as red mud and coal gangue，etc.The main elemental composition of this solid waste is Si，Al，Fe，Ca，Na and O，etc.It has the potential to prepare cementitious materials in terms of chemical composition and phase composition.The preparation of industrial solid waste into low cost cementitious material is an effective way to realize the large utilization of solid waste as well as energy conservation and emission reduction.Solid waste cementitious materials with 65% of red mud and coal gangue were prepared.Different mass ratios between red mud and coal gangue was considered.The recombination method of thermal activation and compound activation methods were used to improve their cementitious properties.X-ray diffraction（XRD），thermogravimetric-differential thermal analysis（TG-DSC） and Fourier infrared spectroscopy analysis were used to analyze the hydration products at different ages.The results show that the mass ratio of red mud to coal gangue has an important influence on the compressive strength of the hardened pastes，as well as the formation and development of hydration products.When the addition of red mud and coal gangue in the solid waste cementitious materials are 39% and 26% respectively，the compressive strength is the highest on the 3rd day，up to 13.28 MPa.When the addition of red mud and coal gangue in the solid waste cementitious materials are 13% and 52% respectively，the compressive strength on the 28 days is the highest，up to 31.62 MPa.The XRD patterns show that the red mud and coal gangue composites after thermal activated can react with gypsum，calcium hydroxide and carbonate to form ettringite （AFt），monosulfoaluminate hydrate （AFm），Hemicarbonate （Hc），and so on.TG-DSC analysis show that the content of C-A-S-H gel and AFt produced by different mass ratios of red mud and coal gangue is different.The pozzolanic reaction of the samples with higher coal gangue content is stronger at 28 days，resulting into the higher consumption of the calcium hydroxide in the activator，which is the main reason for the rapid development of the compressive strength of the red mud-coal gangue based solid waste cementitious materials at 28 days.A synergistic effect between red mud and coal gangue was determined by the heat activation and the addition of calcium based activators，i.e.， the release of active aluminate and silicate ions was promoted and the pozzolanic reaction was activited with more hydration products formed.Thus，it is conducive to the improvement of the compressive strength of sample in the early and late stages.This research provides theoretical guidance for the application of red mud and coal gangue-based bulk industrial solid wastes with higher aluminum and silicate components in the preparation of pavement base materials，wall building blocks and mine filling materials.

Key words: red mud, coal gangue, thermal activation, calcium based activation, ettringite, pozzolanic reaction, solid waste cementitious materials

CLC Number: 

  • TQ177

Table 1

Chemical composition of raw materials by X-ray fluorescence spectrometer（XRF）analysis（%）"

原料名称SiO2Al2O3Fe2O3CaONa2OTiO2MgOK2OSO3LOI

赤泥

煤矸石

熟料

石膏

13.76

57.05

18.80

10.96

22.90

23.21

4.10

3.97

32.35

3.61

3.90

1.30

3.30

0.52

64.80

24.72

9.37

0.45

0.10

0.44

3.68

0.80

0.00

0.14

0.25

0.61

0.70

2.26

0.13

1.59

0.70

0.75

0.43

0.12

2.90

33.84

12.99

11.72

3.20

21.20

Fig.1

X-ray diffraction analysis patterns of the raw materials"

Table 2

Mixing design of the raw materials"

样品编号RM∶CG煤矸石+赤泥/%熟料/%石膏/%石灰/%

S1

S2

S3

S4

S5

S6

S7

S8

S9

1∶9

2∶8

3∶7

4∶6

5∶5

6∶4

7∶3

8∶2

9∶1

65

65

65

65

65

65

65

65

65

15

15

15

15

15

15

15

15

15

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

Fig.2

Particle size distribution diagram of the solid waste cementitious materials with different mixing design of red mud and coal gangue"

Fig.3

Paste compressive strength of the solid waste cementitious materials with different mixing design of red mud and coal gangue at determined curing ages"

Fig.4

Analysis of XRD diffraction patterns of the pastes at different curing ages"

Fig.5

TG-DSC analysis diagram of the hydrated samples at different curing ages"

Fig.6

Infrared spectrum of the hydrated samples at different curing ages"

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