印尼某低品位红土镍矿的热解性能

为提高红土镍矿火法冶炼工艺技术指标，对印尼某低品位红土镍矿进行了热解性能分析。结果表明：该红土镍矿属于典型的低品位过渡层红土镍矿，主要组成矿物为利蛇纹石、针铁矿、石英、铁蛇纹石、叶蛇纹石和高岭石，镍主要赋存于蛇纹石、橄榄石等硅酸盐类矿物中，部分以氧化镍形式赋存于针铁矿中。红土镍矿热解分析结果表明：在86 ℃时有1次失重过程，形成1个吸热峰，有H2O溢出，对应自由水的脱除；在268 ℃时有1次失重过程，形成1个吸热峰，有H₂O溢出，对应针铁矿的脱羟基过程；在589 ℃时发生失重，形成1个吸热峰，有H₂O溢出，对应高岭石、利蛇纹石的脱羟基反应；在816 ℃时有1个放热峰，而红土镍矿质量没有变化，对应利蛇纹石热解产生无定型的硅酸盐重结晶后产生镁橄榄石（Mg₂SiO₄）及顽火辉石（MgSiO₃）的过程；在1 126 ℃时有1次失重过程，有CO₂溢出，由白云石分解产生。试验结果对红土镍矿火法工艺的改进有指导作用。

Pyrolysis Property of the Low Grade Laterite Ore from Indonesia

In order to improve the technical indicators of pyrometallurgical process of the low grade laterite nickel ore,the pyrolysis properties of the low grade nickel laterite ore from Indonesia was studied. The results showed that the laterite belong to the typical transition layer laterite. The main mineral composition of the laterite are lizardite,goethite,silica,greenalite,schwei-zerite and kaolinite. Nickel mainly occur in the Ni-riched silicate ores,such as serpentine and olivine. And part of nickel occur-rence as nickel oxide in goethite. The pyrolysis analysis results indicated that first weight loss of the laterite occurred at 86℃, which form an endothermic peak and the main violent is H2 O. The first stage corresponded to the evaporated of the free water. The second weight loss of the laterite occurred at 268 ℃,which form an endothermic peak and the main violent is H2 O. The second stage corresponded to the dehydroxylation of goethite. The third weight loss of the laterite occurred at 589 ℃, which form an endothermic peak and the main violent is H2 O. The third stage corresponded to the dehydroxylation of kaolinite and liz-ardite. The laterite form an exothermic peak at 816 ℃,and the quality almost no change,which caused by lizardite pyrolysis produce the amorphous silicate,and the amorphous silicate recrystallization to the forsterite ( Mg2 SiO4 ) and pyroxene ( Mg-SiO3 ) . The last weight loss of the laterite occurred at 1126 ℃,which form an exothermic peak,and the main violent is CO2 . The last stage corresponded to the dolomite decomposed. The experimental results can be somewhat conductive to improve the pyrogenic process of the laterite.