Light-calcined magnesia calcining furnace desulfurization technique and system

Abstract

The invention provides a light-calcined magnesia calcining furnace desulfurization technique and system. The technique comprises steps as follows: light-calcined magnesia and water are added into a slurrying tank for slurrying, and the slurry enters a recycling tank; the slurry in the recycling tank is pumped to the top of a desulfurizing tower by a recycle pump and performs reflux absorption with fume which enters the bottom; the absorbed fume is discharged to air by a subsequent exhaust blower; the liquid on the bottom of the desulfurizing tower returns into a finned heat exchanger to be naturally cooled by an axial fan; the desulfurized solution enters the recycling tank; an air blower is additionally arranged in the recycling tank, and magnesium sulfite in the oxidizing solution also performs the function of further cooling; and when the solution concentration reaches 250 g / L, the solution is pumped to a magnesium cement construction material system to be used as a magnesium cement raw material. Only an ammonium chloride recycling process exists in the whole technical process, and thus, the technique is environment-friendly and clean.

Description

technical field

[0001] The invention relates to a desulfurization process and system in the process of producing light-burned magnesia by using magnesite, belonging to the field of comprehensive utilization of non-metallic resources. Background technique

[0002] At present, the equipment for producing light-calcined magnesia by calcining magnesite mainly includes calcining shaft kilns and rotary kilns, but in actual production, calcining shaft kilns are mainly used. In places such as Haicheng and Dashiqiao, Liaoning, my country, there are Hundreds of calcination shaft kilns, with the same equipment structure, all adopt direct-fired shaft kilns using hot dirty gas as fuel. The process includes: magnesite is pretreated to remove miscellaneous ores, washed soil, etc., and crushed into 100-250mm The blocks are lifted to the top of the shaft kiln by the hoisting device, fed into the material bell, and fed into the kiln through the material bell. Air and water vapor are introduced...

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