Hybrid slag metallurgy smelting reduction recycling method

Abstract

The invention discloses a hybrid slag metallurgy smelting reduction recycling method and belongs to the field of non-blast-furnace ironmaking and comprehensive utilization of resources. According to the method, blast furnace slag in a molten state and steel slag in a molten state are added into a heat preserving device or a smelting reaction device with slag liquid capable of flowing out, and are mixed to form reaction mixed slag, the reaction mixed slag is monitored in real time, the reaction mixed slag obtained by adjusting, controlling and guaranteeing temperature, performing uniform mixing and making the mass concentration of FeO smaller than or equal to 1.0% is subjected to separating recycling treatment, and the slag can serve as mineral slag cement, a cement adjusting agent, an adding agent in cement production and cement clinker, or cement clinker high in additional value is produced. The method is short in reaction time, high in metal recycling rate, low in production cost, high in raw material adaptability, large in treatment amount, environment-friendly and high in economic benefit, utilizes the high temperature, high chemical activity and high flux performance of the slag, and is a new smelting reduction process.

Description

technical field [0001] The invention belongs to the fields of non-blast furnace ironmaking and resource comprehensive utilization, and in particular relates to a recovery method of mixed slag metallurgical smelting reduction. Background technique [0002] In recent years, my country's iron and steel industry has developed rapidly. In 2015, the output of pig iron exceeded 700 million tons, and the output of crude steel exceeded 900 million tons. Ironmaking and steelmaking produce a large amount of blast furnace slag, steel slag and other iron and steel metallurgical slag and soot. As of 2015, the total amount of blast furnace slag, steel slag, ferroalloy slag and soot has exceeded 400 million tons. [0003] Blast furnace slag is produced during the blast furnace reduction process and is a metallurgical intermediate product. It not only contains reducing substances, such as coke, coal powder, carbon, carbon powder, etc., but also contains relatively high levels of CaO, MgO, an...

AI Technical Summary

Problems solved by technology

The method has short reaction time, high metal recovery rate, low production cost, strong raw material adaptability, large processing capacity, environmental friendliness, high economic returns, and can effectively solve the problems of environmental pollution, metallurgical resources and efficient recovery and utilization of heat energy. The new process of slag metallurgy, a new smelting reduction process, is the perfection and innovation of the existing metallurgical process. It is the first time in the world to develop a slag metallurgical process. The slag is not a waste, but a metallurgical intermediate product