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A Synchronous Technology for Utilizing Waste Heat of Steel Slag to Recycle Sludge and Harmless Chromium Slag

A technology of resource utilization and steel slag, applied in the direction of direct heating dry distillation, solid waste removal, energy input, etc., can solve the problems of effective utilization of less heat energy, avoid secondary heat pollution, reduce the amount of carbon on the surface, and improve the quality of fuel products Effect

Active Publication Date: 2018-04-20
广西百色建宏再生资源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • A Synchronous Technology for Utilizing Waste Heat of Steel Slag to Recycle Sludge and Harmless Chromium Slag
  • A Synchronous Technology for Utilizing Waste Heat of Steel Slag to Recycle Sludge and Harmless Chromium Slag

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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 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 present invention is a method for synchronously treating liquid steel slag, chromium slag and sludge. The sludge is heated and gasified by steel slag, and then the sludge is catalytically cracked at high temperature by catalysts such as hazardous waste chromium slag, which is relatively thorough under the condition of steam gasification. Converting sludge into low-molecular high-temperature energy gas avoids coking on the surface of chromium slag. At the same time, the high-temperature energy gas is used to heat the chromium slag, and the hexavalent chromium in the chromium slag is reduced to trivalent chromium at the same time, and the energy gas is cooled by the way, and the CO2 and Cl in the energy gas are absorbed by the alkaline substances in the chromium slag. This process greatly saves energy while detoxifying chromium slag and cooling steel slag, and obtains high-grade energy gas at the same time.

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 Patents(China)
IPC IPC(8): C10B53/07C10B49/16B09B3/00B09B5/00
CPCY02P20/129Y02P20/143
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