公开(公告)号：US3649186A

公开(公告)日：1972-03-14

申请号：US3649186D

申请日：1968-01-25

Applicant: MONTEDISON SPA ,  MONTIPONI E MONTEVECCHIO SPA ,  GIUSEPPE SIRONT ,  AMOS VASCHETTI ,  UMBERTO COLOMBO ,  GIOVANNI SCACCIATI

Inventor： COLOMBO UMBERTO ,  SCACCIATI GIOVANNI ,  SIRONI GIUSEPPE ,  VASCHETTI AMOS

IPC: C01G9/02 ,  C22B19/04 ,  C22B19/34 ,  B01D51/00 ,  B01D59/28

CPC classification number: C22B19/04 ,  C01G9/02 ,  C22B19/34 ,  Y02P20/129

Abstract: A continuous process for obtaining zinc oxide of a grade higher than 75 percent from oxidized zinciferous ores, which comprises: Preheating the zinc-containing mineral and calcining it at temperatures above 800* C. (preferably at 900*-1,000* C.) by the combustion products of the gases leaving the reducing reactor. Treating the calcined ore in a fluidized bed at a temperature of from 1,000 to 1,200* C. with reducing gases obtained by direct injection of a hydrocarbon fuel and of an amount of air less than stoichiometric into the fluid bed and discharging the zinc-free residues. Burning the reducing gas of the reduction stage containing the metallic zinc vapors with air to produce a burnt gas containing CO2, H2O and ZnO. Using the burnt gas to preheat the air necessary for the partial combustion of the fuel by indirect heat exchange and the incoming zinciferous ore by direct heat exchange. Subjecting the off gases, after having released part of their heat to the air and to the ore, to separation in order to recover the zinc oxide.

Abstract translation: 从氧化的含锌矿石中获得高于75％的氧化锌的连续方法，其包括：将含锌矿物预加热并在高于800℃（优选在900℃-1000℃）下煅烧，由 离开还原反应器的气体的燃烧产物。 在流化床中在1000至1200℃的温度下处理煅烧的矿石，通过直接将烃燃料和少于化学计量的空气量直接注入流化床而获得的还原气体并排出无锌残渣 。 用空气燃烧含有金属锌蒸汽的还原阶段的还原气体，产生含有CO 2，H 2 O和ZnO的燃烧气体。 使用燃烧气体通过间接热交换预热燃料部分燃烧所需的空气，并通过直接热交换预热进入的含锌矿石。 在将部分热量释放到空气和矿石之后，将废气进行分离以回收氧化锌。