用还原焙烧法从硫铁矿烧渣中提取铁,制得FeSO4,并以其为原料,在初始铁离子浓度c(Fe2+)为0.15~0.25mol/L、n(Na2CO3)/n(FeSO4)=1的近中性条件(pH值为6~7)下,制备了α-FeOOH晶核;滴加Na2CO3溶液以中和生成α-FeOOH时释放的H+,控制溶液pH值为4~5,使Fe2+以适宜的氧化速率在α-FeOOH晶核的外延生长,制得了均匀性较好的针状α-FeOOH晶体(宽30~40 nm、长约为250 nm).
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