Intelligent temperature-controlled fluidized bed roasting furnace for flotation concentrate of nonferrous metals

Fluidized bed roasting furnace

is an advanced equipment based on solid fluidization technology for roasting a variety of materials, and it occupies an important position in industrial production.
Structure and working principle
The main structure of the fluidized bed roasting furnace is composed of a steel shell, an insulation brick layer and a refractory brick layer. There is an insulation layer on the outside, which can effectively prevent the corrosion of the equipment by condensed acid. The wind chamber and the air inlet pipe are located at the bottom of the furnace body, and above it is an air distribution plate, on which a refractory concrete hearth with a wind cap is buried. The middle part of the furnace is conical in shape, and the roasting space in the upper part has a large cross-sectional area, which can reduce the blowing of solid particles. On the furnace body, there are also feeding ports, slag overflow ports, furnace gas outlets and other pipes, and the top of the furnace is equipped with explosion-proof holes. When working, hot air is blown out from the small holes on the side of the wind cap, so that the material presents a fluidized state similar to boiling in the furnace. In this state, the material is fully in contact with the gas to achieve an efficient roasting reaction. Taking the roasting of sulfide ore as an example, a large amount of heat is released during the reaction process, and sulfur dioxide-containing gas is produced, which can be used for the manufacture of sulfuric acid, and the remaining slag can be used as a metallurgical raw material.
Performance characteristics
High efficiency: It has a high roasting intensity, can process low-grade ores, and the residual sulfur content in the slag is low. At the same time, the sulfur dioxide concentration in the furnace gas produced is high and the sulfur trioxide content is low.
Heat recovery: A large amount of heat energy can be recovered to generate medium-pressure steam and improve energy utilization.
Operational advantages: The furnace bed temperature is evenly distributed, the structure is simple, there are no rotating parts, the investment cost is low and the maintenance cost is low, the degree of automation is high, the operating cost is low, the driving is convenient, and the air pollution is small when parking.
Disadvantages: There is a lot of mineral dust carried in the furnace gas, and the power consumption of the air blower is large.
Fluidized bed roasters are mainly used in sulfuric acid manufacturing, non-ferrous metal smelting and other industries, and can process a variety of materials including pyrite, non-ferrous metal flotation concentrate, etc.