Method for combined production of activative carbon, white carbon black and soda by employing biomass power plant waste

Abstract

The invention relates to a combined producing method of active carbon, silica hydrated and soda with the waste of biomass power plant, which comprises the following steps: firstly, immersing and leaching the ash of rice husk of the power plant with lye to generate sodium silicate solution or sol and insoluble substance; secondly, separating the sodium silicate solution or sol from the insoluble substance, and carbonizing and neutralizing the sodium silicate solution or sol with the carbon dioxide recovered from the flue gas of the power plant to generate sedimentation of silicon dioxide and sodium carbonate solution; finally, preparing active carbon, silica and soda with the insoluble substance, the sedimentation of silicon dioxide and the sodium carbonate solution. The invention has the advantages that the ash of rice husk can be fully utilized, the carbon dioxide in the flue gas can be reasonably utilized, thereby the power plant has a great progress toward the target of zero draining, and the production cost and the energy consumption are reduced greatly, and the profit is increased obviously, and the invention has the great social and economic benefit.

Description

technical field [0001] The invention relates to a comprehensive utilization technology of biomass power plant waste, in particular to a method for co-producing activated carbon, white carbon black and soda ash by using biomass power plant waste. Background technique [0002] Due to the increasing shortage of natural energy such as coal and oil in the world, scientists and technicians from all over the world are studying the use of biomass to replace coal and other energy sources for power generation. Taking my country as an example, dozens of biomass power plants that use rice husks to generate electricity have been established. While these biomass power plants burn rice husks to obtain clean electricity, they will generate a large amount of waste such as rice husk ash and flue gas. At present, for the treatment of rice husk ash waste, people usually use part of it as agricultural fertilizer, and part of it as filler for road construction, and most of the rice husk ash that...

AI Technical Summary

Problems solved by technology

Its concept is embedded in a perfect cycle, but unfortunately, the method of calcining limestone to produce carbon dioxide will not only cause a vicious cycle of waste gas and dust due to the emergence of lime kilns, and the pollution will be more serious, but will also increase a lot of energy consumption

Secondly, for uninterrupted circulation, the generated soda ash is also wasted

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