碱度对腐泥土型红土镍矿烧结行为的影响

doi:10.13228/j.boyuan.issn0449-749x.20150466

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Abstract In order to understand the phase transformation and consolidation mechanism of saprolitic nickel laterite ore， the chemical analysis， X-ray diffraction analysis and fusion property of the green briquettes as well as the roasted briquettes were carried out according to the micro sintering experiment and fusion characteristic experiment using the three-pyramid method. The metallurgycal phase diagram was also analyzed on the condition of the addition of CaO， which was usually use as flux in sintering process. Experimental results shown that the main minerals formed during sintering with natural basicity were refractory materials such as spinel (MgFe2O4)， forsterite ((Mg，Fe)2SiO4) and enstatite (MgSiO3)， which were all minerals with rather high fusion temperature. With increasing basicity from natural basicity 0.5 to 2.0 according to adjusting the addition proportion of CaO， the enstatite firstly transformed to dipophide (CaMgSi2O6) with lower fusion temperature. With the increasing content of CaO in the laterite ore briquitte， the akermanite (Ca2MgSi2O7) and merwinnite (Ca3MgSi2O8) with higher fusion temperature were generated in succession. All the three fusion characteristic temperatures decreased initially and then increased with a valley at the basicity of 1.0. It’s revealed that the amount of binder phase could be increased significantly by adjusting basicity， and the ideal binder phase for sintering of saprolitic laterite ore was diposide.

Received: 14 September 2015 Published: 11 July 2016

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ZHI Qian. Effect of bacisity on sintering behavior of saprolitic nickel laterite[J]. Iron and Steel, 2016, 51(7): 9-14.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20150466 OR http://www.chinamet.cn/Jweb_gt/EN/Y2016/V51/I7/9

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