Method for preparing a cementing material using smelting industrial waste slag after utilizing the simultaneous removal of S02 and NOx in flue gas and application of the cementing material obtained by the same

A method for preparing a cementing material using smelting industrial waste slag after utilizing the simultaneous removal of SO2 and NOx in flue gas, comprising the following steps:

• mixing the smelting industrial waste slag with a phase regulator to form a mixture, and then performing thermal activation pretreatment on the mixture to obtain an activated slag;
• mixing the activated slag, an oxidant and water to obtain the slurry for desulfurization and denitration;
• contacting the slurry with flue gas to be treated such that the flue gas is subjected to the desulfurization and denitration treatment to obtain a slurry containing sulfate and nitrate;
• performing solid-liquid separation on the slurry containing sulfate and nitrate to obtain a solid phase and a liquid phase;
• and
• drying the solid phase to obtain the cementing material;
• wherein the smelting industrial waste slag comprises ferromanganese alloy slag and/or copper smelting slag, and the phase regulator is CaO, Na2CO3 or B2O3,
• wherein the mass ratio of the smelting industrial waste slag to the phase regulator is 10:(1-3);
• wherein the thermal activation pretreatment comprises:
• sequentially performing first grinding, roasting and second grinding on the mixture, wherein the roasting temperature is 800-1200° C., and the roasting time is 60-180 minutes, and wherein the products obtained by the first grinding and the second grinding each independently has a particle size of 200-300 mesh.