硫铁矿烧渣水热法合成纳米球形α-Fe_2O_3  

Nano sphere-shaped α-Fe_2O_3 synthesized hydrothermally from pyrite slag

作　　者：朱云贵[1] 施善友[1] 李学良[1] 朱玉蓉[1] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2003年第2期264-267,共4页Journal of Hefei University of Technology：Natural Science

摘　　要：运用XRD、TEM等测试手段,对硫铁矿烧渣水热法合成α-Fe2O3的工艺进行了研究。结果表明:硫铁矿渣的最佳酸浸工艺为加入理论量1.3倍的75%硫酸,在300℃下反应2h后用热水搅拌浸出,铁的浸出率高达93.94%。20℃时加入计量的沉矾剂,并用NH3·H2O调整浸出液pH值至2.50后加热至65℃反应2h,95.1%铁以铁矾形式析出。将析出的铁矾制成0.3mol/LFe(OH)3悬浊液,用5%NaOH调整pH值至11.30后,在搅拌速率600～700r/min、升温速率为2.5℃/min的条件下加热至(172±2)℃水热反应2h,得到粒度约为55nm的均匀球形α-Fe2O3。The technical process of αFe2O3 synthesized hydrothermally from pyrite slag is studied by using XRD and TEM. The optimizing technical conditions for iron extraction are that the adding quantity of sulfuric acid(concentration:75%) is 1.3 times as much as the theoretical quantity and the reaction system is soaked in heat water for 2 h at 300 ℃,then the percentage of iron extracted from slag can reach 93.94%. In separating iron from the lixivium of slag,some reagent for alum deposition is put into the lixivium and the pH value is adjusted to 2.50 by using NH3·H2O at 20　℃,then the lixivium is heated to 65　℃ and the reaction is kept for 2 h,thus the iron obtained as the crystal of ferric alum can be up to 95.1%. In synthesizing hydrothermally αFe2O3,the suspension of 0.3　mol/L Fe(OH)3 is prepared from ferric alum and the pH value of the suspension is adjusted up to 11.30 by using NaOH(concentration:5%),then with the heating rate of the autoclave being 2.5　℃/min and the stirring rate of the autoclave being 600~700　r/min,the reaction is kept for 2 h at (172±2)　℃,and αFe2O3 with uniform sphere shape and apparent dimension of about 50 nm is obtained.

关 键 词：水热法 纳米球形α-Fe2O3 硫铁矿烧渣 铁矾 纳米材料 合成工艺 酸浸 硫酸 

分 类 号：TB383[一般工业技术—材料科学与工程] X781.305[环境科学与工程—环境工程]