Abstract: Basic magnesium sulfate whiskers were synthesized by hydrothermal method with MgSO₄ and Mg(OH)₂ as raw materials.Preparation process and characterization method were also studied.Experimental results indicated optimum technological conditions for preparing basic magnesium sulfate whiskers were as follows:concentration of MgSO₄ was 1.28 mol/L，amount-of-substance ratio of MgSO₄ to Mg(OH)₂ was 1～4,the stir intensity is 450 r/min,reaction temperature was 200 ℃,and reaction time was 6 h.Results showed that high purity MgSO₄•5Mg(OH)₂•2H₂O whiskers with smooth surface were obtained under those conditions.Furthermore,the product was delicate,uniform and without bending with about 20～45 μm in length and more than 31 in slenderness ratio.

Key words: basic magnesium sulfate whiskers；hydrothermal method； magnesium salt