CIESC Journal ›› 2019, Vol. 70 ›› Issue (4): 1542-1549.doi: 10.11949/j.issn.0438-1157.20181367

• Festschrift in Honor of Professor Gordon McKay on occasion of his retirement • Previous Articles     Next Articles

Mineral transformation in process of combined extraction of alumina from coal gangue and red mud

Yumei GUO1,2(),Liqiong CAO1,Yanxia GUO1(),Kezhou YAN1   

  1. 1. Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes, Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, Shanxi, China
    2. Shanxi Vocational and Technical College of Coal, Taiyuan 030001, Shanxi, China
  • Received:2018-11-18 Revised:2019-01-04 Online:2019-04-05 Published:2019-01-17
  • Contact: Yanxia GUO E-mail:gym641117@sohu.com;guoyx@sxu.edu.cn

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Abstract:

Combined extraction of alumina from coal gangue and red mud was studied. The effect of red mud on the alumina extraction of coal gangue and the consumption of Na2CO3 was investigated. The effect of the red mud on the activation process of coal gangue by Na2CO3 calcination was studied by way of TG-DSC and XRD. The results showed that the dissolution of alumina for the mixed “coal gangue-red mud-Na2CO3” sample increased with the Na/Al molar ratio and the calcination temperature. The alumina dissolution of the mixed sample reached 91.7% when the Na/Al molar ratio was 1.2 and the calcination temperature was 850℃ at the Al/Si molar ratio of 1. The consumption of Na2CO3 decreased 77.9% at this condition by comparison with that of coal gangue activated directly by Na2CO3. The results of TG-DSC and XRD showed that the interactions among coal gangue, red mud and Na2CO3 were weak at <700℃ and were strengthened at >800℃. The addition of red mud would make the phases in the mixed sample selectively transformed into nepheline and zeolite with a Na∶Al∶Si molar ratio of 1∶1∶1 owing to the adjustment of the Al/Si molar ratio of the sample.

Key words: coal gangue, red mud, alumina, activation, waste treatment, mineral transformation

CLC Number: 

  • TQ 17

Fig.1

XRD patterns of samples"

Table 1

Chemical compositions of samples"

SamplesContents/%(mass)
SiO2Al2O3Fe2O3CaOK2ONa2OTiO2Loss on ignition
coal gangue43.221.93.70.92.50.40.7621.8
red mud19.123.415.713.31.39.44.415.3

Fig.2

Dissolutions of Al2O3 for calcined CG-RM-Na2CO3 samples in hydrochloric acid solution"

Table 2

Amounts of coal gangue (CG), red mud (RM) and Na2CO3 at various Na∶Al∶Si molar ratios"

Na∶Al∶Si

molar ratio

Amounts of samples/gMass percent of Na2CO3 accounting for total mass/%
CGRMNa2CO3
0.5∶1∶1100206.816.75.2
0.8∶1∶1100206.838.611.1
1∶1∶1100206.853.414.8
1.2∶1∶1100206.867.818.1
1.5∶1∶1100206.889.722.6

Fig.3

TG-DSC analysis for samples of coal gangue (a), red mud (b), and CG-RM-Na2CO3 (c)"

Fig.4

XRD patterns for calcined “CG-RM-Na2CO3” (a) and its acid-leached residue (b) at various Na/Al molar ratios"

Fig.5

XRD patterns for calcined “CG-RM-Na2CO3” (a) and its acid-leached residue (b) at various calcination temperatures"

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