Metallurgical Resource Recycling

(1) Technical Objectives

Realize full‑volume disposal of iron‑bearing and carbon‑bearing solid wastes within the plant, and reduce the consumption of fossil solid fuel by 10‑15 kg per ton of iron. Develop complete‑set process technologies to achieve over 35 % proportion of recycled steel materials in the whole process. Master the technology of biomass energy application in ironmaking, and realize the substitution of more than 20 % of blast furnace injected coal by biomass charcoal, so as to cut the consumption of fossil solid fuel by over 35 kg per ton of iron. By adopting the above‑mentioned process technologies, the CO₂ emission per ton of steel can be reduced by 15‑20 %.

(2) Technical Measures

① Full‑volume and high‑efficiency utilization of iron‑bearing and carbon‑bearing solid wastes: Develop graded and quality‑based pretreatment technologies for iron‑bearing and carbon‑bearing solid wastes, high‑quality and high‑efficiency energy utilization technologies coupled with metallurgical processes, and whole‑process pollutant control technologies. Build a multi‑dimensional adaptation model between iron‑bearing & carbon‑bearing solid wastes and metallurgical furnaces, so as to realize full‑volume, high‑efficiency and value‑added resource utilization.

② Large‑proportion application of recycled steel materials: Develop technologies for applying recycled steel materials in blast furnaces to raise the usage of recycled steel materials in blast furnace ironmaking. Thereby reduce the heat consumption for iron ore reduction and lower CO emissions.

3.3 Low‑Carbon Smelting Technology - Hydrogen‑Enriched Carbon Cycle

(1) Technical Objectives

Develop carbon‑iron composite burden materials to boost indirect reduction inside blast furnaces. Improve the utilization efficiency of hydrogen and carbon in blast furnaces via hydrogen‑enriched carbon cycle. Meanwhile, adopt green electricity to replace part of carbon‑based fuel for heating, restructure the existing blast furnace process, and achieve more than 35 % reduction in carbon emission per ton of iron.

(2) Technical Measures

① Hydrogen‑enriched carbon‑cycle blast furnace: Optimize the composition of by‑product gas at blast furnace top through high‑oxygen‑enriched blast or full‑oxygen operation. Apply CO₂ separation technology to convert top by‑product gas into reducing gas for blast furnace and high‑concentration CO₂. Use green electricity to heat the high‑reducing‑potential gas to a high temperature for massive injection into the blast furnace, realizing 100 % carbon recycling efficiency of the blast furnace. Meanwhile, mix hydrogen‑rich substances into the carbon cycle process to strengthen hydrogen‑enriched smelting performance and cut the consumption of solid coal in blast furnace process.

② New‑type burden materials: Mix low‑grade pulverized coal and iron ore fines at a certain ratio. After heating, forming and composite reaction, obtain blast furnace lump feed where metallic iron is dispersed in carbon matrix. Charge carbon‑iron composite burden together with iron‑bearing burden into the blast furnace, so as to improve internal reduction kinetic conditions, raise shaft efficiency, cut fuel consumption and lower CO emission of blast furnaces.

③ Microwave sintering pre‑reduction technology: Conduct pretreatment on different types of iron ores, then heat them to high temperature for agglomeration. Introduce hydrogen for cooling and reduction under high‑temperature condition to produce pre‑reduced metallized microwave sinter for blast furnace feeding. It reduces blast furnace fuel consumption and CO₂ emissions from both iron ore agglomeration and blast furnace ironmaking procedures to support sustainable