CONTINUOUS-ACTION AUTOCLAVE FOR HIGH-TEMPERATURE OPENING OF PYRRHOTINE MATERIALS Russian patent published in 1998 - IPC

FIELD: autoclaves for hydrothermal opening of pyrrhotine materials by means of gaseous reagent-oxidizer. SUBSTANCE: autoclave includes horizontal cylindrical housing divided into sections by vertical partitions with two-tier mechanical mixing devices mounted in sections in pairs, built-in heat exchangers and devices for feeding the gaseous oxidizer into pulp made in form of vertical aeration pipe with perforated lower section and blanked-off free end and agitator mounted between mixing devices at distance not exceeding 0.8 diameter of agitator from axis of symmetry. In processing materials containing 31mass-% of sulfur or lesser, lower boundary of perforation of aeration pipe is located at level not lower than 0.2 and not higher than 0.8 of diameter of lower tier agitator from plane of rotation and upper boundary of perforation of aeration pipe is located below plane of rotation of upper tier agitator by 0.1-1.2 of its diameter. In processing the materials containing more than 31 mass-% of sulfur, lower boundary of perforation of aeration pipe is located above plane of rotation of lower-tier agitator by 1.1-1.5 of its diameter and upper boundary of perforation of aeration pipe is located above plane of rotation of upper-tier agitator by no more than 0.5 of its diameter. Density of perforations of aeration pipe along geometric generatrices of its surface is uniform and perforations in sections perpendicular to axis of aeration pipe is not uniform. Perforated sections of aeration pipe have form of two equal arcs in its cross section. Each arc is subtended by central angle equal to (0,4÷0,8)π radians turned towards mixing devices in such way that center of arc lies in line connecting the points of intersection of axis of aeration pipe and axes of mixing devices with secant plane. EFFECT: increased output of autoclave; increased degree of decomposition of pyrrhotine and increased degree of use of gaseous oxidizer. 3 cl, 4 dwg, 1 tbl, 3 AppР