The invention provides an internal recycling method for KR desulfurized
slag in a
steel mill. The internal recycling method comprises the following steps that KR desulfurized
slag is crushed, and then subjected to
magnetic separation to obtain
slag iron and
tailings; then, the
tailings are subjected to high-temperature oxidation treatment, and
sulfur-containing
flue gas and pre-melted slag are obtained; and then
sulfur-containing
flue gas is collected and treated, the pre-melted slag is used as a slagging material for converter early-stage slagging, and internal recycling of the KR desulfurized slag in the
steel mill is achieved. Through the manner, the slag iron in the KR desulfurized slag can be effectively separated from the
tailings which are difficult to recycle, and the tailings are subjected to high-temperature oxidation treatment, so that the iron in the tailings is oxidized into
iron oxide while sufficient desulfurization is performed, and the
sulfur-free pre-melted slag rich in CaO and
iron oxide is obtained; and further, by utilizing the synergistic effect between the CaO and the
iron oxide, the pre-melted slag is used as a slagging material for converter early-stage slagging, so that the iron
oxide promotes quick
dissolution of
lime, and the slagging pressure of converter
steelmaking is reduced while comprehensive utilization of the KR desulfurized slag is realized.