Method for preparing desulfurizing agent by carrying out thermal activation on red mud and active carbon

Abstract

The invention discloses a method for preparing a desulfurizing agent by carrying out thermal activation on red mud and active carbon and belongs to the field of coal desulfurization. The method comprises the specific steps: step a: sieving the red mud and the active carbon with a 300-mesh sieve respectively; drying at 105 DEG C until the weight is constant; step b: mixing the red mud and the active carbon according to the mass ratio ranging from (1 to 10) to (1 to 30); step c: activating a mixture in the step b in a muffle furnace at 700 DEG C to 1100 DEG C for 10min to 30min; after finishing the thermal activation, naturally cooling to room temperature under a sealed condition. The method disclosed by the invention has the advantages that the waste dreg red mud produced in a production process of aluminum oxide is prepared into the desulfurizing agent; a preparation process is simple and the activation time is short; the wet-method desulfurizing efficiency can reach 90 percent; the desulfurizing rate can be maintained to be 87 percent when the desulfurizing agent is continuously used under a low pH (Potential of Hydrogen) condition; the dosage of the desulfurizing agent is reduced so that the desulfurizing agent is economical and feasible.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of red mud, in particular to a method for thermally activating red mud and activated carbon to prepare a desulfurizer. Background technique [0002] Red mud is the polluting residue left after the alumina components are extracted by physical and chemical processes in alumina production. More than 1.5 tons of red mud are produced for every ton of alumina produced. At present, my country produces more than 30 million tons of red mud every year. A large amount of red mud cannot be effectively and comprehensively utilized, so it can only be piled up in large-scale storage yards, which not only occupies a large amount of land, but also causes alkaline substances to dissolve due to leaching and other effects, polluting soil, surface water, and groundwater. [0003] The main component of red mud is SiO 2 And CaO, is an alkaline substance with well-developed pore structure and large specific su...

AI Technical Summary

Problems solved by technology

However, the preparation of the above desulfurizers is generally activated at 100-600°C for 1-12 hours, and there are problems such as long activation time and poor desulfurization effect; at the same time, during the stable operation of wet flue gas desulfurization, a large amount of replenishment is required Fresh slurry ensures that the operating pH is maintained at 4.8-6, which has the problems of large desulfurization agent consumption and high equipment operating costs

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