Sulfuric acid pressure leaching technology is the most widely utilized process in the industry for extraction nickel and cobalt from laterite ore.It boasts advantages,such as low energy consumption,low carbon emissions,and high nickel and cobalt recovery ratios.However,during the sulfuric acid pressure leaching of laterite ore,the autoclave is prone to scaling,which can lead to a reduction in the autoclave's effective volume,alterations in fluid flow patterns within the autoclave,and pipeline blockages.In this paper,to clarify the scaling mechanism of laterite ore in sulfuric acid pressure leaching autoclave,we utilized chemical analysis,the MLA mineral automatic quantitative analysis system,scanning electron microscopy,and other methods to study the mineralogical characteristics of the autoclave scaling,including mineral composition,mineral particles,elemental states,embedding characteristics,and particle size distributions.The results show that the scale in the autoclave is mainly composed of hydrated aluminum sulfate as the framework,wrapped around hematite,chromite and other mineral phases in the leach residue of lateritic ore.Metal elements,such as nickel,cobalt,manganese and magnesium,enter the autoclave scale mainly through adsorption,with nickel and cobalt primarily adsorbed by iron-bearing mineral phases.
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