摘要
大洋锰结核氨浸渣是锰结核提取有色金属后的残留物,主要矿物成分为菱锰矿,少量的针铁矿、粘土矿物、石英和非晶二氧化硅。锰结核氨浸渣煅烧处理是锰结核氨浸渣制备脱硫吸附剂的关键步骤。本文用XRD、TGA-DTA、SEM、BET-SSA等表征方法研究了大洋锰结核氨浸渣热处理结构演化。结果表明,锰结核氨浸渣主要是菱面体形状的菱锰矿,煅烧产物仍然保持菱面体假象,但是由于菱锰矿分解氧化,在其表面形成大量的网状孔,导致比表面积增大;在30～1000℃的升温过程中,失重主要发生在450～560℃之间;450～500℃空气气氛煅烧后菱锰矿分解并氧化为MnO2;当煅烧温度继续升高时MnO2转化为Mn2O3和Mn3O4;脱H2S实验表明,锰结核氨浸渣480℃煅烧产物脱硫效率最高,1g煅烧产物可去除的310mgS2-。
Ocean manganese nodule leaching residue（OMNLR）is a solid waste material derived from ocean manganese nodule after being extracted non-ferrous metals.The main mineral composition is rhodochrosite and quartz.Calcination treatment is a key step in preparing desulfurization sorbent.In this paper,the structural evolution of OMNLR under heat treatment was characterized by using XRD,TGA-DTA,SEM,TEM,BET-SSA,etc.The results show that OMNLR is mainly composed of rhodochrosite crystals.Calcined product remains rhombus false,but it results in a large number of reticular pores on the surface and increases of specific surface area because of decomposition and oxidation of rhodochrosite.The quality of OMNLR decreases during temperature increasing from 30 to 1000 ℃,and weight loss mainly occurs between 450 ℃ and 560 ℃.The rhodochrosite chiefly oxidizes to MnO2 between 450 ℃ and 500 ℃ by calcinating under air atmosphere,and MnO2 is changed into Mn2O3 and Mn3O4 with increasing calcination temperature up to 600 ℃.Desulfurization experiment indicates that the calcinate which is calcinated at 480 ℃ under air atmosphere has the highest desulfurization efficiency,which being 310 mg S^2-/（g·calcinate）.
出处
《矿物学报》
CAS
CSCD
北大核心
2010年第4期417-422,共6页
Acta Mineralogica Sinica
基金
国际海底区域研究开发"十一五"项目(DYXM-115-01-4-07)
关键词
锰结核氨浸渣
表征
煅烧温度
脱硫
manganese nodule leaching residue
characterization
calcination temperature
desulfurization
