Inorganic cpd. or mixt. prodn. e.g. for catalyst, alloy, prepn. - includes mechanically pulverising solid starting material mixt. to fine particles

摘要

Prodn. of inorganic cpd(s). (I) or their mixts., esp. catalysts, alloys, intermetallic cpds., adducts of metals and/or oxides or superconductors, involves mixing the solid starting materials (II) and mechanical pulverisation to a particle size finer than 10 microns. Pref. (II) are oxides and/or metals, esp. Ti, Cu, Ni, Co, V, Mo, Fe, Sn, Ag, Cr, Si, Al, Y, Ba, La, Sr, Bi and/or Zn and opt. also Pd, V and/or Re, as metal or oxide. Pref. (II) are pulverised to particles finer than 4 microns, pref. 0.1-4 microns and with a narrow granulation with d50 = 0.1-1 micron. Pulverisation of (II) is carried out for 1 s to 60 min, pref. 5-15 min, and with heating, pref. to 300-400 deg. C, esp. in a reactor operating at an energy desnity of 0.5-500, pref. 5-200 kw/1 reactor vol. (II) pref. are pulverised (mechanically) to 30-300, esp. 60-120 microns before mixing , opt. in the presence of additive(s) (III), pref. in amts. of 0.1-3 (wt.)% w.r.t. (II). (III) pref. prevent reagglomeration of pulverised (II). Mixing and/or pulverisation is carried out by impact with a fluid, pref. a liquid, esp. water or an oxidising or reducing liquid. Oxides may be reduced (with H2) or metals oxidised during and/or after pulverisation. Pref. water is added during pulverisation and (I) are sepd. from the suspension or dispersion by flotation, coagulation and/or pptn. adsorption. ADVANTAGE - High (I) yields and rapid reaction rates are attained with much less environmental pollution than usual.