Chemical Disaggregation of Rock.
U S Pat 3 567 427 1971 May; :
Rocks composed of mineral particles cemented with illite-type clays are disintegrated by solutions of hydrazine or hydrogen peroxide. Thus, 3-pct copper ore composed of chalcocite in a matrix of illite and gypsum was immersed in aqueous 15-80 pct n2h4 solution at room temperature, resulting in essentially complete disintegration. The liquid was decanted off and the ore was wet screened. The +48 mesh fraction constituted 1.9 pct of the original ore and contained 8.5 pct cu. The -48+200 mesh fraction constituted 6.9 pct of the original ore and contained 6.0 pct cu. Similar results were obtained with aqueous 15-30 pct h2o2 solution or with illitic shale or kaolinitic sandstone.
U.S. Pat. 3,567,427; May 2, 1971; Chem Absr. 74:101,262V