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镍铜硫化物矿石中磁黄铁矿固溶体的退火及其选矿意义
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引用本文:顾硅兴,赵明,吴昌志.2003.镍铜硫化物矿石中磁黄铁矿固溶体的退火及其选矿意义[J].地质论评,49(3):261-264,[DOI]:.
.2003.Annealing of Pyrrhotite Solid Solution in Nickel-copper Ores: Significance to Mineral Processing[J].Geological Review,49(3):261-264.
DOI:
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顾硅兴  赵明  吴昌志
南京大学地球科学系南京大学成矿作用国家重点实验室 210093 (顾连兴,赵明)
,南京大学地球科学系南京大学成矿作用国家重点实验室 210093(吴昌志)
基金项目:国家自然科学基金(编号49172094)
中文摘要:磁黄铁矿固治体从硫化物熔体结晶后,在缓慢冷却过程中经历了显著的退火。出治和出治体的租化是固治体退火的两种方式。叶片状的单斜磁黄铁矿和“火焰状”的镍黄铁矿原始出治相在降温过程中均可发生退火和租化。分布于磁黄铁矿等矿物粒间或包于磁黄铁矿粒内的粒状镍黄铁矿,不只是高温出治的直接产物,有一部分可能是由火焰状出治体租化而成的。磁黄铁矿中单斜变体的出治和租化可使矿石的磁性发生改变,镍黄铁矿出治体的租化使含镍矿物的粒度加大。因而,退火作用对矿石的选矿工艺性能有着显著影响。
中文关键词:镍铜硫化物矿石 磁黄铁矿固溶体 镍黄铁矿 选矿工艺 退火作用
 
Annealing of Pyrrhotite Solid Solution in Nickel-copper Ores: Significance to Mineral Processing
GU Lianxing,ZHAO Ming,WU Changzhi Department of Earth Sciences,State Key Laboratory of Mineral Deposit Research,Nanjing University,210093
Abstract:Pyrrhotite solid solution, subsequent to crystallization from sulfide melt, will suffer strong annealing during slow cooling. Annealing is represented by both of the two processes, exsolution of the solid solution and grain coarsening of the exsolution products including lamellar, monoclinic pyrrhotite and flame-like pentlandite. Although high-temperature exsolution mechanism has been recognized as a major mechanism for the formation of granular pentlandite included inside pyrrhotite grains or occurring along grain boundaries between pyrrhotite and other minerals, coarsening of flame-like pentlandite is considered by the present authors as another possible mechanism. Exsolution of monoclinic pyrrhotite and coarsening of the exsolution lamellae will modify the magnetic property of pyrrhotite in ores, whereas coarsening of exsolved pentlandite will increase the size of this nickel-bearing mineral. As a result, annealing will have significant effect on the processing properties of ores.
keywords:pyrrhotite,pentlandite,solid solution,exsolution,annealing,processing,
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