Microwave Activation of Blast Furnace Slag

Abstract

The invention relates to a microwave activation method for blast furnace slag, which belongs to the technical field of blast furnace slag activation and carbon dioxide sequestration. The method for microwave activation of blast furnace slag of the present invention comprises the following steps: a. mixing blast furnace slag, ammonium salt and catalyst to obtain a mixed material; the catalyst is at least one of barium titanate and lead titanate, and the ammonium salt It is at least one of ammonium sulfate and ammonium bisulfate; b. heating the mixed material to 250-500°C with microwaves, and heat-retaining reaction for 5-10 minutes; c. adding water to the material after heat-retaining reaction in step b, dissolving , filtering to obtain filtrate 1 and filter residue 1, the filtrate 1 contains activated calcium and magnesium ions. The present invention uses microwave technology in conjunction with a specific catalyst to realize microwave intensification and catalysis in the blast furnace slag activation process, and activates calcium and magnesium ions in blast furnace slag within a relatively short processing time, thereby greatly reducing energy consumption for purification and improving efficiency .

Description

technical field The invention relates to a microwave activation method for blast furnace slag, which belongs to the technical field of blast furnace slag activation and carbon dioxide sequestration. Background technique Global carbon dioxide emissions will hit a record 410×10 in 2017 8 t, its large amount of emission is the main factor leading to global warming, the El Nino phenomenon, and the prolongation of the high temperature climate in Chengdu year after year. By 2050, carbon capture and storage (CCS) will account for 19% of the total global carbon dioxide emission reduction, making it the second largest emission reduction technology after improving energy efficiency. CCS technology is mainly composed of two parts: carbon capture and carbon storage. Among the traditional storage technologies, there are mainly geological storage and ocean storage. The advantage of geological storage is that it has a large storage capacity and can be stored permanently. The disadvantage...

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Problems solved by technology

The method comprises the following steps: (1) mixing and roasting titanium-containing blast furnace slag and ammonium sulfate to obtain roasted slag and ammonia gas, and absorbing the ammonia gas with water to obtain ammonia water; (2) leaching the roasted slag with water and filtering to obtain leaching liquid and leaching slag; (3) react the leaching slag of step 2, the ammonia water of step 1 and carbon dioxide to obtain mineralized slag and mineralized mother liquor; (4) adjust the pH of the solution with the ammonia water of step 1 for the leaching liquid of step 2, precipitate and filter step by step to obtain Metatitanic acid and aluminum hydroxide precipitation and magnesium-rich solution; (5) the magnesium-rich solution in step 4, the ammoniacal liquor of step 1 and carbon dioxide react to obtain magnesium carbonate precipitation and mineralization mother liquor; (6) the step 3 and 5 The mineralized mother liquor is mixed and evaporated, cooled, and crystallized to obtain ammonium sulfate solid, which is recycled; (7) the precipitates in step 4 are calcined respectively to obtain TiO 2 and Al 2 o 3 , but the response time is still longer

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