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Synchronization technology for recycling sludge and detoxifying chromium slags by utilizing residual heat of steel slags

A technology of recycling steel slag, applied in the direction of direct heating and dry distillation, removal of solid waste, energy input, etc., can solve the problem of effective utilization of less heat energy, avoid secondary heat pollution, reduce carbon content on surface area, and improve energy efficiency. Effect

Active Publication Date: 2016-05-04
广西百色建宏再生资源有限公司
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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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  • Synchronization technology for recycling sludge and detoxifying chromium slags by utilizing residual heat of steel slags
  • Synchronization technology for recycling sludge and detoxifying chromium slags by utilizing residual heat of steel slags

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[0033] (1) Liquid steel slag at a temperature of 1500-1700°C is poured from the slag tank to the inlet of the wheel-type feeder. After quantitative feeding and preliminary crushing, it enters the entrance of the drum crushing device from the outlet, mixes with sludge, and puts Sludge pyrolysis, then steel slag and sludge pyrolysis coke are transported to the outlet of the drum crushing 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; sludge and steel slag The continuous input mass ratio of 1:2;

[0034] (2) The cooling water in step (1) is fed from the outlet of the drum crushing 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 drum crushing device Mixed with sludge pyrolysis gas; the mixed gas is then ...

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Abstract

The invention relates to a method for synchronously processing liquid steel slags, chromium slags and sludge. The steel slags are heated, the sludge is gasified, and then catalysts such as dangerous waste chromium slags are used for high-temperature catalyzing of the sludge; under the condition of steam gasification, the sludge is relatively and thoroughly converted into low-molecular high-temperature energy gas, so that the condition that the surfaces of the chromium slags are coked is avoided. Besides, the high-temperature energy gas is used for heating the chromium slags, so that hexavalent chrome in the chromium slags is reduced to obtain trivalent chromium, and the energy gas can also be cooled; CO2 and Cl in the energy gas are absorbed by alkaline substances in the chromium slags. The technology can detoxify the chromium slags and cool the steel slags, energy can also be greatly saved, and besides, high-grade energy gas is obtained.

Description

technical field [0001] The present invention is a method for synchronously treating chromium slag and sludge 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): C10B53/07C10B49/16B09B3/00B09B5/00
CPCY02P20/129Y02P20/143C10B53/07B09B3/00B09B5/00C10B49/16
Inventor 张大磊郝志鹏李公伟
Owner 广西百色建宏再生资源有限公司
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