Abstract: This paper studied the effective factors for the preparation of spindle-type hematite particles by forced hydrolysis of ferric nitrate at elevated temperatures. A small quantity of phosphate ions were added into such a system before ageing. It was found that spindle-type hematite particles could be obtained in high ferrio nitrate concentration within a shorter preparation time, which is advantageous for the realization of the production of NP magnetic particles by a new preparation way.

Key words: hematite, spindle-type particles, forced hydrolysis preparation