Lurgi roaster

As shown in Figure 2, the roaster plant consists of two lines with two 72 m Lurgi roasters (diameter 9.6 m). Under normal operating conditions, the bed temperature is about 950 C, the fluidising air feed is 42,000-44,000 Nm and the wind box pressure is about 2550... 

The Zincor process is based on the roast-leach-electrowinning process. The zinc sulphide concentrate is roasted in four Lurgi fiuo-solids roasters to produce zinc oxide and sulphur dioxide gas. The SO2 gas is fed to two Monsanto double absorption acid plants. 

In 1989, Lurgi commercialized a 575 ton/day wet feed slurry circulating fluidized bed refractory gold roaster operating at about 640°C and near ambient pressure (Peinemann, 1990). A second unit of identical design was added in 1990. A third unit with dry feed handling and a capacity of about 2000 ton/day gold... 

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