Method for reducing converter slag by utilizing coal gas and recycling furnace slag

Abstract

The invention relates to a method for reducing converter slag by utilizing coal gas and recycling furnace slag. The method comprises the following steps: dividing a converter smelting process into a converter steelmaking process and a converter slag thermal treatment process, wherein in the converter steelmaking process, impurity elements in molten iron enter the converter slag in the form of oxides by virtue of oxidization reaction, thereby forming thermal-state converter slag with high phosphor content; pouring the converter slag into a treated slag filling unit, carrying out the converter slag thermal treatment process, transferring the slag filling unit with the converter slag to a converter slag treatment station, enabling the converter slag to generate thermal-state reduction taking the coal gas as a reducing medium in the converter slag treatment station, wherein a reducing proportion of FeO is greater than 80%, and a reducing proportion of P2O5 is greater than 80%; and while carrying out the thermal-state reduction treatment process, recycling waste heat of the converter slag and recycling gaseous-state phosphor, and taking the treated converter slag as pre-melting slag, and returning the pre-melting slag and an iron-containing cooling material into a converter for reapplication.

Description

Technical field [0001] The invention belongs to the technical field of high-efficiency utilization of solid waste resources in a converter steelmaking process, and particularly relates to a method for reducing hot high-phosphorus converter slag using coal gas and performing slag recycling. Background technique [0002] In order to meet the requirements of low-cost, high-efficiency, and stability of clean steel production by iron and steel enterprises, metallurgical workers conducted a systematic and detailed analysis of the steel production process. According to the different metallurgical characteristics of each smelting stage, the traditional "one-stop" steelmaking method of the converter is decomposed into hot metal pretreatment and desulfurization, low-temperature early stage high-efficiency dephosphorization of the converter, intermediate slagging, low slag decarburization in the later stage of converter smelting Several process steps such as steel, slag splashing and furnac...

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Problems solved by technology

[0007] In view of the above-mentioned problems, the present invention aims to propose a high-efficiency, energy-saving, and environmentally-friendly method that can realize high-efficiency utilization of low-grade gas, return and reuse of converter slag, and recovery and utilization of waste heat of converter slag, so as to solve the problem of low gas utilization efficiency in the prior art, Poor utilization rate of converter slag and low waste heat recovery of converter slag

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