Method for removing sulfur and phosphorus from iron ore powder through microwave hydrogen reduction

Abstract

The invention provides a method for removing sulfur and phosphorus from iron ore powder through microwave hydrogen reduction, and relates to the technical field of hydrogen metallurgy and microwave metallurgy. Obtaining the temperature and the molten state of a metal phase in the iron ore powder; the microwave irradiation power is controlled according to the temperature and the molten state, microwave irradiation is conducted on the iron ore powder, so that no liquid phase is generated in the reduced metal iron phase, and reducing gas is introduced for step-by-step reduction of iron oxide; introducing protective gas into the reduced metal iron phase, and recovering to room temperature to obtain reduced iron powder; and carrying out magnetic separation on the reduced iron powder to obtain target reduced iron powder. According to the invention, the hydrogen reduction effect and the gasification dephosphorization and desulfurization effects can be promoted. High-efficiency reduction at a low temperature is achieved, the content of sulfur and phosphorus in raw materials is controlled, the cleanliness of steel is improved, the difficulty of desulfurization and dephosphorization in the subsequent molten metal smelting process can be reduced, iron ore powder can be reduced to directly produce iron powder, and the smelting process is shortened.

Description

technical field [0001] The invention relates to the technical fields of hydrogen metallurgy and microwave metallurgy, in particular to a method for desulfurization and phosphorus reduction of iron ore powder by microwave hydrogen reduction. Background technique [0002] The iron and steel industry has a huge output scale and an outstanding historical contribution, which is of great significance to supporting the future development strategy of the national economy and society. At the same time, the carbon emission environment and policy pressure are becoming more and more severe, and zero or low carbon breakthrough technology has become the proposition of the times in the field of steel manufacturing. To this end, domestic and foreign countries are vigorously developing cutting-edge technologies for carbon reduction and carbon resource reuse. Blast furnace ironmaking has large capacity and high efficiency, but the contradiction between the reality of high coke ratio and high...

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Problems solved by technology

[0004] Therefore, the current hydrogen-rich ironmaking mainly has the following technical problems: 1. The hydrogen reduction process is a strong endothermic reaction, and the hydrogen metallurgy process requires a continuous heat source. The current mainstream hydrogen-rich smelting mainly relies on natural gas, biomass and other fuels to provide heat sources, and there is still carbon dioxide Second, during the reduction smelting process, harmful elements such as sulfur and phosphorus enter the molten iron, and it is difficult to dephosphorize and sulfur the liquid iron, and it is easy to return sulfur and phosphorus

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