Low-carbon metallurgy method

According to the low-carbon metallurgy method, high-concentration CO mixed raw gas is selectively recycled, a high-cost and complex purification process and equipment facilities are not needed, an adjustable valve set is additionally arranged between a normal gas recycling switching valve and a converter gas main pipe, and gas is led out and enters a newly-built high-concentration CO raw gas cache cabinet. The gas cabinet body is connected with a coal injection system, and compressed carbon monoxide-rich gas is used for replacing compressed air or nitrogen for original injection to inject pulverized coal. Due to the introduction of reducing gas, coal injection and coke are correspondingly reduced, and the yield of the blast furnace is improved and the total emission amount of carbon dioxide is reduced on the premise of appropriately reducing the coke consumption. If the blowing amount of the CO gas is required to be further increased, an auxiliary pipeline can be added, and the CO gas is supplemented into the