CAJ | 학술논문

利用铝酸钠溶液晶种分解过程研究游离碱对晶体附聚的影响,利用 NaOH 溶液模拟游离碱环境研究AlOOH和Al(OH)3在NaOH溶液中的溶解?结晶性能.结果表明:游离碱对晶体附聚起抑制作用,并且抑制作用随其浓度增加而增强.由于可作为附聚粘结剂的新生细晶粒活性高,而游离碱对高活性晶粒有强烈侵蚀作用,因此晶体附聚受到抑制.晶粒溶解速率随温度、游离碱浓度、转速、晶粒活性的增大而增大.基于溶解?结晶模型并拟合实验数据发现, AlOOH和Al(OH)3在NaOH溶液中的溶解速率正比于游离碱浓度的1次方及晶体表面积的1.5次方.比较AlOOH和Al(OH)3在NaOH溶液和铝酸钠溶液中的溶解?结晶性能可知,铝酸根的存在抑制了游离碱对晶体的侵蚀作用.
이용려산납용액정충분해과정연구유리감대정체부취적영향,이용 NaOH 용액모의유리감배경연구AlOOH화Al(OH)3재NaOH용액중적용해?결정성능.결과표명:유리감대정체부취기억제작용,병차억제작용수기농도증가이증강.유우가작위부취점결제적신생세정립활성고,이유리감대고활성정립유강렬침식작용,인차정체부취수도억제.정립용해속솔수온도、유리감농도、전속、정립활성적증대이증대.기우용해?결정모형병의합실험수거발현, AlOOH화Al(OH)3재NaOH용액중적용해속솔정비우유리감농도적1차방급정체표면적적1.5차방.비교AlOOH화Al(OH)3재NaOH용액화려산납용액중적용해?결정성능가지,려산근적존재억제료유리감대정체적침식작용.
@@@@The effect of free caustic alkali (FC) on agglomeration of crystal was discussed through seeded precipitation of sodium aluminate solution. By simulating ambience of FC, the dissolution-crystallization performances of AlOOH and Al(OH)3 in NaOH solution were investigated. The results show that the agglomeration is inhibited by FC, and the inhibitory effect becomes stronger with increasing concentration of FC (ρFC). The crystals that freshly form in sodium aluminate solution can make small particles agglomerate as binder, and is eroded by FC, so the agglomeration of crystal is inhibited. The erosion rate of crystals increases with increasing temperature, ρFC, rotating speed and crystal particle activity. Based on dissolution-crystallization model and experimental data, it is found that the orders of erosion rate with respect to cFC and crystal surface are estimated to be 1 and 1.5, respectively. The erosion of FC is inhibited by aluminate ions, which is obtained by comparing the dissolution-crystallization performances of AlOOH and Al(OH)3 in NaOH solution with those in sodium aluminate solution.