Study On Anti-erosion Materials Prepared With Titanium-bearing Blast Furnace Slag By Carbon-thermal Reduction And Nitridation

Titanium bearing blast furnace slag is a kind of artificial titanium resources, in which the content of Ti O₂ is about 20wt%. And titanium bearing blast furnace slag will waste a lot of titanium resources due to massive accumulation. Ti N has a good future in the field of alkali resistant metal vapor corrosion with the advantages of high melting point, high hardness, corrosion resistance and oxidation resistance, etc. Based on this point, the materials with excellent resistance to alkali metal vapor and mechanical propert y is prepared with titanium bearing blast furnace slag.Erosion-resistant materials were prepared by the method of carbothermal reductionnitridation using Ti-bearing Blast Furnace Slag and graphite as main materials and sintered magnesia as auxiliary materials in experiment. The results show that: the determined experiment parameters were that nitrogen carbonization temperature was 1400?, holding time was 3h and the molar ratio of slag and graphite was 1:2. Meanwhile graphite was the best reducing agent and samples were fired by one time. The prepared samples has excellent resistance to alkali metal vapor and mechanical propert y, which flexural strength was 91.57 MPa.The effects of different additives?K₂CO₃, Ca F₂ and Si O₂? on the synthesis of Ti N in the process of carbothermal reduction- nitridation was studied. The results showed that K₂CO₃ and Ca F₂ could promote the growth of Ti N grains in a certain extent while Si O₂ was beneficial to the synthesis of Ti N. The phenomenon of Ti N grains generating on the surface was obvious and grew intergally when the binary alkalinity was 0.8.The samples had the function of concentrated alkali solution corrosion with flexural strength loss rate less than 1% and alkali metal vapor corrosion with weight gain rate less than 1%. The major performance of samples prepared in best conditions could meet the standard of refractories in the upper blast furnace. And apparent porosity was 2.46%, bulk density was 3.4 g·cm-3 and flexural strength was 91.57 MPa.