Preparation of Fiber-Shaped Nano-Mg(OH)2 with Carbonization-Precipitation Method

In this paper, light-burned dolomite was used as the raw material to prepare fibroid nano-Mg(OH)(2). First of all, basic magnesium carbonate (BMC) was prepared by carbonizing light-burned dolomite. Secondly by adding ammonia water used as precipitator to BMC which was acidulated, Mg(OH)(2) was prepared by chemical precipitation method. At last, ethanediamine was used to reprocess Mg(OH)(2) to control the recrystallization for fibroid nano-Mg(OH)(2). The fibroid nano-Mg(OH)(2) was characterized by SEM, XRD and TG-DTA methods. The XRD results indicated that the fibroid nano-Mg(OH)(2) with perfect crystal were obtained when the recrystallization temperature was above 180 degrees C. SEM analysis showed that the grain size increased with the increase of ethanediamine. The effect of recrystallization time on the Mg(OH)(2) crystal showed that fibroid nano-Mg(OH)(2), with 20 similar to 30 nm in diameter and 400 similar to 700 nm in length, were observed after 21 hours heating retreatment. The TG-DTA results showed that Mg(OH)(2) would decompose to MgO at temperature range of 318 similar to 416 degrees C.