| 摘要 |
<p>In prepn.of basic poly-Al chloride solns. (I) contg. sulphate, (a) substances contg. Al are decomposed with HCl, (b) insol. residue is filtered off, (c) the soln. is evaporated, (d) AlCl3.6H2O is recovered by crystallisation from the soln., (e) the AlCl3.6H2O is converted to a solid, basic Al chloride by thermal decomposition at 150-200 deg. C, (f) the solid, basic Al chloride is dissolved in aq. H2SO4, with formation of Al(OH)xCly(SO4)z, and (g) the basic Al chloride-sulphate soln. is heated at 40-70 deg. C for 1-3 hours. The Al-contg. substance is pref. a waste prod. The soln. is pref. evaporated to 30 wt.% AlCl3 content. The AlCl3.6H2O pref. has particle dia. 250-450 microns and 3-10 wt.% residual moisture. The basicity, OH:Al = 1.35-2.25:1. Heating is in a vortex layer. The basic Al chloride is pref. dissolved in water before soln. in H2SO4. Dissolution in water or in aq. H2SO4 is at 40-70 deg. C, to a soln. contg. 3-10 (5-7.5) wt.% Al. After heating, the basic Al chloride-sulphate soln. pref. has OH:Al = 1.05-1.95:1, and 1-6 (2-4) wt.% sulphate content, and is then filtered.</p> |
