By Ida Valeton (Eds.)
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Extra resources for Bauxites
This transformation may take place at very low temperatures. The transformation of boehmite into corundum is via solution and the intermediate diaspore phase. System A I, 03-Si0,-H, 0 Layer silicates of bauxite deposits are minerals of the kaolinite-, montmorilloniteand chlorite groups. Silica Silica dissolves fastest and most easily in tropical climates and hence requires a close study. In water, silica may: (a) polymerize to colloidal silica; (b) form dispersed molecules of %(OH),; (c) occur as ions.
Phase diagrams A1z03-HzO. A. After ERWINand OSBORN (1951) with projected points of diaspore stability after and HEIDE,1965). injection of diaspore nuclei (NEUHAUS B. After KENNEDY (1959); according to him there is no boehmite stability field. C. After TORKAR and KRISCHNER (1963) with new metastable “Ubergangstonerden”: a-Ah03; y-AlzO3 (obtained in the autoclave), A1203 K I. CHEMICAL REACTIONS IN AQUEOUS SOLUTION AND NEOMINERALIZATION I 300 i i i 200 - 39 k,,OH,! -c I 100 0 i , 100 I I __--**I 200 I I 300 LOO TEMPERATURE IN 5 0 OC NEDY (1959), TORKAR (1960) and TORKARand KRISCHNER (1963) and NEUHAUS and HEIDE(1965).
They believe that more or less complete Al-hydroxide layers are introduced in between structural units (= “chloritization of montmorillonite”). ALTSCHULER et al. (1963) described weathering of montmorillonite in a kaolinite deposit in Florida. 0). This is followed by the slow disintegration of tetrahedrons, thus transforming montmorillonite into mixed layers of montmorillonite-kaolinite in a 1/1 proportion. Altschuler’s conception of the formation of defined mixed layers yielding 14-A reflexes from montmorillonite degradation by selective disintegration of tetrahedron layers seems to be more reasonable than the model of “chloritization” by the introduction of Al-hydroxide layers.
Bauxites by Ida Valeton (Eds.)