Device and method for quenching dry-method treatment and sensible heat recovery of high-temperature molten slag

Abstract

The invention discloses a device and a method for quenching dry-method treatment slag and sensible heat recovery of high-temperature molten, wherein a slag stop plate, a slag guide groove, a cooling roll group and a slag removal roll in the device are sequentially arrayed on the outer surface of a rotary drum along the rotation direction of the rotary drum; a slag particle collector is arranged below the slag removal roll; a crusher is arranged on the lower part of the slag particle collector; a waste heat recovery device is arranged below the crusher. The method comprises the following steps of: placing the high-temperature molten slag on the surface of the rotating rotary drum via the slag guide groove; conveying the high-temperature molten slag to a space between the rotary drum and the cooling roll group by the rotary drum; extruding the high-temperature molten slag to be shaped like sheets, cooling and solidifying the high-temperature molten slag to form glass-body solid slag, and conveying the glass-body solid slag to the position of the slag removal roll; peeling the glass-body solid slag, and conveying the glass-body solid slag in the waste heat recovery device; dropping the glass-body solid slag in the crusher, and then forming particle slag after crushing; and then conveying the particle slag in the waste heat recovery device. The method disclosed by the invention has the characteristics of being simple to operate, suitable for industrialized production, capable of alleviating environmental pollution, low in process cost, and the like, as well as has a good application prospect.

Description

technical field [0001] The invention relates to high-temperature slag utilization technology, in particular to a device and method for rapid cooling and dry processing of high-temperature slag and recovery of sensible heat. Background technique [0002] There are a large number of high-temperature slags in the industrial field, such as blast furnace slag, steel slag, copper slag, nickel slag, etc.; the temperature of these slags is mostly around 1500 °C; the total amount is measured in hundreds of millions of tons, which is a high-quality waste heat resource. It has high recycling value. [0003] Taking the blast furnace slag with the largest amount as an example, the current treatment of blast furnace slag is mainly based on the water quenching process, that is, the blast furnace slag is quenched with a large amount of water, and the formed water quenched slag has a glass body content of more than 95%. , has good hydration activity, and can be used to produce building mater...

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Problems solved by technology

The wind crushing method uses high-speed air jets to granulate the molten slag to obtain solid slag particles, and uses cold air as the cooling medium to recover the waste heat of the slag particles. The overall vitrification rate of the slag particles obtained by the wind crushing method is greater than 95%. The waste heat recovery rate is about 48%; however, the wind crushing method has problems such as large power consumption, large floor space, and high overall cost.

The basic principle of the centrifugal granulation method is to use the centrifugal force of the rotating cup to granulate the high-temperature slag into small slag particles, which form high-temperature solid particles after cooling, and use a fluidized bed or a solid particle waste heat boiler to recover the waste heat of the solid particles; centrifugal granulation The granules obtained by the centrifugal granulation method are relatively uniform, and the vitreous body content can also meet the requirements for manufacturing cement; however, the granulation device of the centrifugal granulation method has a complicated structure and reliability needs to be improved, and there is still a distance from industrial application.

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