Technology for synchronously recycling biomass and enabling chromium slag to be harmless by steel slag waste heat

A technology of biomass and resource utilization, applied to the removal of solid waste, chemical instruments and methods, transportation and packaging, etc., can solve the problems of effective utilization of less heat energy, avoid secondary heat pollution, improve fuel product quality, surface area The effect of reducing the amount of char

Active Publication Date: 2016-05-04
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

But there are very few technologies to effectively use the thermal energy in it

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  • Technology for synchronously recycling biomass and enabling chromium slag to be harmless by steel slag waste heat
  • Technology for synchronously recycling biomass and enabling chromium slag to be harmless by steel slag waste heat

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example 2

[0033] (1) Liquid steel slag at a temperature of 1500-1700°C is poured from the slag tank to the inlet of the granulator. After granulation, it enters the inlet of the rotary reaction cooling device from the outlet, mixes with biomass, and pyrolyzes the biomass. Then steel slag and biomass pyrolysis coke are transported to the outlet of the rotary reaction cooling device, and discharged after being cooled by cooling water; the continuous input mass ratio of cooling water for cooling steel slag to steel slag is 1:4; the continuous input mass ratio of biomass to steel slag 1:2;

[0034] (2) The cooling water in step (1) is fed from the outlet of the rotary reaction cooling device, sprayed onto the surface of the steel slag, heated and converted into water vapor; the water vapor then flows in the opposite direction with the steel slag and exchanges heat, and is transported to the inlet of the rotary reaction cooling device Mixed with biomass pyrolysis gas; the mixed gas is then s...

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Abstract

The invention provides a method for synchronously processing liquid steel slag, chromium slag and biomass. The method comprises the steps that biomass is heated and gasified by the steel slag; then catalysts such as hazardous wastes and chromium slag are used for catalyzing and pyrolyzing the biomass at a high temperature; the biomass is converted to be high-temperature low-molecule energy gas thoroughly under the gasifying condition of water vapor, and coking of the surface of the chromium slag is avoided; meanwhile, the high-temperature energy gas is used for heating the chromium slag to enable hexavalent chromium in the chromium slag to be reduced to trivalent chromium; the energy gas is cooled by the way; and CO2 and Cl in the energy gas are absorbed by alkaline substances in the chromium slag. According to the technology, while the chromium slag is made harmless and the steel slag is cooled, energy is greatly saved, and meanwhile high-grade energy gas is obtained.

Description

technical field [0001] The present invention is a method for synchronously treating chromium slag and biomass and cooling steel slag, which greatly saves energy while detoxifying chromium slag and obtaining high-grade energy gas. It belongs to the field of environmental protection and low-carbon technology. Background technique [0002] Chromium slag is a by-product emitted during the production of dichromate. Because it contains water-soluble hexavalent chromium, it is extremely toxic. If it is stacked in the open air without treatment, it will cause varying degrees of pollution to groundwater sources, rivers or sea areas, and seriously endanger human health and the growth of animals and plants. [0003] Generally speaking, the current detoxification methods for chromium slag (that is, changing highly toxic hexavalent chromium into trivalent chromium) are divided into two categories: wet detoxification and dry detoxification. But each has its own problems. The wet method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/45B09B3/40
Inventor 张大磊李公伟郝志鹏
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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