Blast furnace slag thermal fracture centrifugal drying method granulation device and method

Abstract

The invention aims at the problem existing in the prior art for blast furnace slag treatment, provides a blast furnace slag thermal fracture centrifugal drying method granulation device and method and belongs to the technical field of treating devices for blast furnace metal smelting waste. The device comprises an intermediate tank, a granulation chamber, a filling type countercurrent heat exchanger and a high-temperature air collecting purifier. The intermediate tank is located on the upper portion of the granulation chamber. The granulation chamber is located on the upper portion of the filling type countercurrent heat exchanger. The intermediate tank, the granulation chamber and the filling type countercurrent heat exchanger are sequentially connected. The high-temperature air collecting purifier is located outside and is connected with the granulation chamber and the filling type countercurrent heat exchanger through pipelines. According to the device and the method, a drying method is adopted for treating blast furnace slag, high-temperature sensible heat of the blast furnace slag can be utilized for generating power, precious water resources can be saved, emission of harmful gas is reduced, and energy consumption is reduced. Moreover, for the treated blast furnace slag, due to the extremely low water content of the dried slag, the vitrification rate can be kept 95% or above.

Description

technical field [0001] The invention belongs to the technical field of blast furnace metal smelting waste treatment, and in particular relates to a blast furnace slag thermal breaking centrifugal dry granulation device and method. Background technique [0002] Blast furnace slag is a by-product of the ironmaking process, which contains abundant sensible heat resources. For every ton of iron produced, about 0.3 tons of blast furnace slag is produced, and the slag discharge temperature is around 1450°C. According to the domestic production of 700 million tons of pig iron in 2014, the domestic annual output of blast furnace slag is about 200 million tons, and the heat contained in it is equivalent to about 12 million tons of standard coal. [0003] At present, steel mills generally adopt the "wet method" of water quenching granulation for blast furnace slag, and then use it as raw material for cement production. This "wet" process has the following problems: [0004] 1. It c...

AI Technical Summary

Problems solved by technology

[0004] 1. It consumes a lot of water resources. It takes about 1 ton of fresh water and 10 tons of recycled water to process 1 ton of slag;

[0005] 2. SO is accompanied by water quenching process 2 and H 2 Emission of acid gas pollutants such as S;

[0006] 3. The high-value sensible heat contained in slag cannot be effectively recycled and utilized, resulting in a huge waste of energy

[0007] 4. Whether the produced slag is further processed to produce fine powder or used as a mixture for cement production, the energy consumption required for drying of about 10% to 15% of the water is huge

Images