Method for using waste cotton stems to prepare catalyst carriers for desulfurization

Abstract

The invention discloses a method for using waste cotton stems to prepare catalyst carriers for desulphurization. The method includes drying, cutting, crushing and carbonizing the waste cotton stems, then grinding the waste cotton stems into powdered carbon with the particle size ranging from 200 meshes to 300 meshes, and uniformly mixing tar with 50-70% bitumen content with a 0.5-2% organic flow agent to prepare forming adhesive; then uniformly mixing from 60 to 70% of the powdered carbon of the cotton stem, from 25 to 35% of the forming adhesive and from 3 to 5% of water, placing the mixture into a screw extruder and realizing extrusion forming under the extrusion pressure ranging from 8.0MPa to 10.0MPa and with the compression ratio ranging from 1.5 to 1.6; and sequentially carbonizing, activating and oxidizing formed colloidal particles, then washing the colloidal particles until the colloidal particles are neutral, and drying the neutral colloidal particles. Intermittent forming production is changed into continuous forming production owing to the extrusion forming of the screw extruder, accordingly, production efficiency is improved, and yield can be increased; and the organic flow agent is added, the proper extrusion pressure and the proper compression ratio are matched, flowability of materials further can be improved, extrusion forming is facilitated, and the catalyst carrier with excellent strength and adsorptivity are obtained.

Description

technical field [0001] The invention belongs to the technical field of preparing catalyst carriers (activated carbon) from biomass materials, and specifically relates to a method for producing catalyst carriers suitable for flue gas desulfurization by using waste cotton stalks as raw materials. Background technique [0002] my country is the largest cotton-producing country in the world, with a cotton planting area of ​​533,300 hectares. Each hectare of cotton field produces 3.375-3.750 tons of cotton stalks, and the annual output of cotton stalks in my country reaches 15.3 million tons. As a kind of available biomass resources, waste cotton stalks can be transformed into huge material wealth only by using advanced technologies and methods. At present, because there is no correct method of processing and utilizing cotton stalks, they are either burned or buried, which not only causes a great waste of resources, but also causes great pollution to the ecological environment. ...

AI Technical Summary

Problems solved by technology

Although the production of activated carbon by chemical method has the advantage of high yield, the consumption of medicines in the production process is large, and the ratio of medicines to raw materials has reached 4-5:1, so the essence of this method is to exchange medicines for production.

The consumption of medicines is large, which not only increases production costs, but also involves the payment of medicine recycling, environmental pollution control, etc., and the follow-up costs are also high

In addition, in order to ensure the quality of the product, a large amount of water is required for washing. The average water consumption for washing 1 ton of activated carbon by chemical method is 30-80 tons, and the physical form of activated carbon produced by chemical method is powder, so it is necessary to increase the production process. Granules can be used for desulfurization, the process is complex

[0006] However, the production of activated carbon by carbonization and activation by the general physical method has no chemical pollution and does not require consumption such as washing of medicines. However, when forming activated carbon materials, presses are generally used. The production of this press is batch production, and the production efficiency is low. ,Low Yield