This report comprehensively analyzes the green cycle technology of iron and steel industry at home and abroad, studies and evaluates the future development direction of the industry and the development trend of new process technology, and clarifies the significance of developing new process of hydrogen metallurgy solid waste source reduction, which has important reference value for the green, low-carbon and high-quality development of the industry. Aiming at the complex hydrogen reduction system with high temperature, multi-phase, multi-component, multi-scale and multiple reactions, the microstructure of mineral phase and the transformation mechanism of price state of iron oxidation during the reaction process were studied, and the principle of near-zero slag discharge electrometallurgy process of HDRI efficient dephosphorization and slag cycle was determined. The effects of high efficiency dephosphorization and separation and recovery of phosphorus resources on phosphorous slag under different conditions were systematically studied. The limiting conditions of ultimate phosphorus removal in phosphorus containing slag and ultimate phosphorus enrichment in phosphorus iron under reduction conditions were analyzed, and the ultimate extraction and resource utilization of phosphorus in liquid slag were determined. Anti-explosion and anti-leakage technologies of heat exchanger and reactor system were developed for the characteristic system of high temperature hydrogen reductor. According to the reaction engineering characteristics of the multiphase mixed reaction system, the simulation experiment of hydrogen reduction reaction was carried out. According to the test results, the reasonable structure of the reactor was proposed and the process control parameters were determined. Through the development of the coupled model of momentum, heat and mass transfer in the reaction process, the coordination and matching relationship of each unit in the hydrogen metallurgy system was studied. The metallization rate of HDRI products was >93% and the utilization coefficient was >6t/m3·d-1 under the conditions of hydrogen flow rate of 5L/min, reduction temperature of 1000℃ and reduction pressure of 0.3MPa. The dynamic mechanism of efficient dephosphorization in HDRI electrometallurgical furnace under the condition of ultra-low slag content was systematically studied, and the process parameters promoting thermodynamic reaction conditions were optimized. When the slag content was 6%, the overall dephosphorization rate of molten steel reached more than 90.23%, and the effect of less slag dephosphorization was realized. The technology of enrichment, extraction and recycling of phosphorus in liquid slag was developed. The content of phosphorus in liquid slag was 0.29%, and the overall recovery rate was 92.89%. ; A 10,000-ton hydrogen direct reduction reactor and a 10,000-ton electric arc furnace have been built, and a new process production system for green hydrogen metallurgy iron and steel production has been constructed. The comprehensive utilization rate of resources has been 100%, the resource production rate has been increased by 62%, and the source reduction of solid waste has been nearly 100%. The principle flow of hydrogen metallurgy process is constructed, the influencing factors, action rules and promotion paths of energy consumption and material consumption in hydrogen metallurgy process are defined, and the green new process software system of hydrogen metallurgy is developed. The results of software simulation have important reference value for the design and operation of pilot test equipment. The research results will be conducive to the selection of appropriate raw fuel conditions, process parameters and operating parameters in the actual production and operation of hydrogen metallurgy to save resources and energy, reduce waste emission and carbon emission.
