Device and method for pretreating steel slag through air quenching of CO2-containing tail gas

Abstract

The invention discloses a device and method for pretreating steel slag through air quenching of CO2-containing tail gas. The device comprises a steel slag tank and an air quenching device, wherein the steel slag tank is a square tank, a grating plate is obliquely arranged in the middle of the interior of the steel slag tank, and a waste slag chamber is fixedly connected to the middle of the side wall, away from the air quenching device, of the steel slag tank, and the bottom discharging port of thesteel slag tank is fixedly connected with a conveying pipe. The method has the beneficial effects that the content of free calcium oxide in the steel slag at about 100 DEG C obtained by the production method is low, the steel slag has good stability, efficient pretreatment of the steel slag can be well realized, and the subsequent resource utilization rate of the steel slag is greatly improved; after high-temperature flue gas at an air pipe outlet of the cyclone separator is discharged from a flue gas port, waste heat is removed for power generation for waste heat recovery, the heat energy utilization rate is improved, the heater is installed at the bottom of the steel slag tank, the heating temperature of the heater is higher than the steel slag melting temperature, the steel slag tank can be heated when necessary, and the steel slag is ensured to be in a liquid state.

Description

technical field [0001] The invention relates to the field of steel slag recycling methods, in particular to a device and method for pretreating steel slag by air quenching with tail gas containing CO2. Background technique [0002] The utilization of steel slag is mainly for the production of steel slag powder as concrete admixture, the production of steel slag cement, for the cement plant as Portland cement batching and burning clinker, steel slag for making bricks and road materials, and part of the casting residue is returned to sintering batching. Whether it is used as a building material or a steel slag for roads, the steel slag is required to have good stability and low metallic iron content to prevent safety and quality problems in projects using steel slag. [0003] Under the existing technology, steel slag pretreatment processes such as hot pouring method, hot stuffing method, water quenching method, wind quenching method, drum method, granulation wheel method, etc....

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Problems solved by technology

[0004] The purpose of the present invention is to provide a device and method for pretreating steel slag by air quenching with CO2 tail gas, so as to solve the problem that the steel slag pretreatment process proposed in the above background technology cannot obtain steel slag that meets the stability requirements and has good activity at one time, which limits Problems of large-scale resource utilization of steel slag

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