| 摘要 |
PCT No. PCT/IT91/00034 Sec. 371 Date Oct. 22, 1992 Sec. 102(e) Date Oct. 22, 1992 PCT Filed Apr. 29, 1991 PCT Pub. No. WO91/17118 PCT Pub. Date Nov. 14, 1991.A process for the production of alkaline chromates by means of oxidative disaggregation in a reactor of substances containing trivalent chromium compounds in admixture with alkali. The oxidative disaggregation is carried out in dry phase by moving the mixture within the reactor while heating the mixture by indirect heat exchange in the absence of combustion gases and under mechanical stress, and feeding to the interior of the reactor oxidizing gas. The mixture is heated to a temperature of between 500 DEG and 1500 DEG C. The oxidizing gas is fed with an oxygen concentration in a range between 8 and 100%. Gases leaving the reactor are used for the acidification of an aqueous solution of alkaline chromates which is then dried and supplied to the reactor. The reactor is a rotating tubular reactor and the mixture moves continuously through the rotating reactor. |
