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Gold Science and Technology ›› 2020, Vol. 28 ›› Issue (5): 669-677.doi: 10.11872/j.issn.1005-2518.2020.05.106

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Experimental Study on Preparation of Filling Cementitious Materials Based on Copper-Nickel Smelting Slag

Lei ZHANG1,2(),Lijie GUO1,2(),Wenchen LI1,2   

  1. 1.BGRIMM Technology Group，Beijing 100160，China
    2.National Centre for International Research on Green Metal Mining，Beijing 102628，China
  • Received:2020-06-12 Revised:2020-07-05 Online:2020-10-31 Published:2020-11-05
  • Contact: Lijie GUO E-mail:zhanglei3465@163.com;ljguo264@126.com

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Abstract:

The copper nickel smelting slag is mainly the pyrometallurgical smelting slag discharged from the copper nickel ore in the smelting process.Its main elements are iron and silicon，with contents of about 40% and 30% respectively.Generally，the disposal of copper and nickel smelting slag is mainly stacking and landfill，which wastes land resources and pollutes the environment at the same time，so the comprehensive utilization rate is low.It has been shown that the copper nickel smelting slag has certain pozzolanic activity，and it is feasible to prepare filling cementitious materials with it.In this paper，copper and nickel smelting slag were ground to different fineness，cement mixed with smelting slag was used as cementitious material，Gobi aggregate was used as aggregate，and orthogonal test was carried out to prepare cementitious filler based on different grinding time，slag content and activator content of smelting slag.By measuring the uniaxial compressive strength of cemented backfill at different ages，the influence rule and mechanism of various factors on the compressive strength of cemented backfill were studied，and the final hydration products were qualitatively analyzed by SEM.The results show that with the increase of grinding time，the uniaxial compressive strength of cemented backfill increases at first and then decreases.The optimal grinding time is 50 min，corresponding to D（0.1），D（0.5） and D（0.9） of 4 μm，29 μm and 120 μm respectively.The addition of smelting slag reduces the uniaxial compressive strength of cemented backfill，but the reduction of compressive strength of backfill in the later period of maintenance is lower than that in the early period.The pozzolanic reaction of copper nickel smelting slag in cement Gobi aggregate system can promote the compressive strength of cemented backfill.SEM images show that the addition of Cu-Ni slag can promote the formation of ettringite and calcium silicate hydrate （C-S-H）.The influence of activator on the uniaxial compressive strength of cemented backfill is not obvious.The results of orthogonal test show that the content of Cu-Ni smelting slag has the greatest influence on the uniaxial compressive strength of cemented backfill， the second is the content of activator，and the least is the grinding time.Using copper nickel smelting slag with grinding time of 50 minutes，the ratio of the slag to cement is 2∶8，the content of activator is 4%，and the uniaxial compressive strength of cemented backfill is the highest.

Key words: copper-nickel smelting slag, alkali activation, mechanical grinding, orthogonal test, cemented filling, Gobi aggregate

CLC Number: 

  • TD853

Table 1

Chemical composition of raw material（%）"

材料名称CaOSiO2Al2O3MgOTFeMnOP2O5K2ONa2OSO3CTiO2
铜镍冶炼渣2.2034.603.205.3050.20-0.080.300.600.600.03-
水泥62.5620.774.402.903.15--0.580.602.80--

Fig. 1

Mineral composition of copper-nickel smelting slag"

Fig. 2

Particle size distribution of copper-nickel smelting slag"

Fig. 3

Particle size distribution of smelting slag at different grinding times"

Table 2

Variation of smelting slag particle size distribution with grinding time"

粉磨时间/minD（0.1）D（0.5）D（0.9）
40748164
50429120
603.42390

Fig.4

Particle size distribution of Gobi aggregate material"

Table 3

Factor level table of test scheme"

因素水平A粉磨时间/minB冶炼渣/%C激发剂/%
140202
250304
360406

Table 4

List of orthogonal test ratio scheme"

编号A粉磨时间B冶炼渣C激发剂A粉磨时间/ minB冶炼渣/%C激发剂/%
1#11140202
2#12240304
3#13340406
4#11250204
5#12350306
6#13150402
7#11360206
8#12160302
9#13260404

Fig. 5

Compressive strength of filling test block at different ages"

Fig. 6

SEM results of Gobi material cemented filling body"

Table 5

Weight analysis calculation table"

编号ABC试验结果y
1#1113.53
2#1222.17
3#1331.93
4#1123.68
5#1232.59
6#1313.12
7#1133.27
8#1213.50
9#1322.30
K17.6310.4810.15
K29.398.268.15
K39.077.357.79
ˉk12.543.493.38
ˉk23.132.752.72
ˉk33.022.452.60
极差R0.591.040.78

Fig. 7

Mear figure of different level"

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