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A synchronous technology for recycling plastic and harmless chromium slag by using blast furnace slag waste heat

A blast furnace slag and resource utilization technology, which is applied in coke ovens, direct heating and dry distillation, chemical instruments and methods, etc., can solve problems such as effective utilization of less heat energy, avoid secondary heat pollution, improve fuel product quality, and reduce emissions. Effect

Active Publication Date: 2019-07-30
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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  • A synchronous technology for recycling plastic and harmless chromium slag by using blast furnace slag waste heat
  • A synchronous technology for recycling plastic and harmless chromium slag by using blast furnace slag waste heat

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example 2

[0033] (1) Liquid blast furnace 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 plastic, and puts Plastic pyrolysis, then blast furnace slag and plastic 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 blast furnace slag to blast furnace slag is 1:4; plastic and high The continuous input mass ratio of slag is 1:2;

[0034] (2) The cooling water in step (1) is added from the outlet of the drum crushing device, sprayed onto the surface of the blast furnace slag, heated and converted into water vapor; the water vapor then flows in the opposite direction with the blast furnace slag and exchanges heat, and is sent to the drum crushing device The inlet end is mi...

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Abstract

The present invention is a method for synchronously processing liquid blast furnace slag, chromium slag and plastics. The blast furnace slag is used to heat and gasify the plastics, and the hazardous waste chromium slag and other catalysts are used to catalyze and crack the plastics at high temperature. The plastic is converted into a low-molecular high-temperature energy gas, which avoids coking on the surface of the 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 blast furnace slag, and obtains high-grade energy gas at the same time.

Description

technical field [0001] The present invention is a method for synchronously processing chrome slag and plastics and cooling blast furnace 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 w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C10B53/07C10B49/16B09B5/00
CPCC10B49/16C10B53/07B09B5/00B09B3/45Y02P20/129Y02P20/143
Inventor 张大磊李卫华李公伟
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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