Micro-alloying refined synthetic slag and preparation method thereof

Abstract

The invention relates to a micro-alloying refining synthetic slag and a process for preparation, belonging to the steel melting technology field. The invention comprises raw material in the following parts that 10-20 parts of vanadium-containing waste, 50-70 parts of lime, 1-2 parts of fluorite, 5-15 parts of silicon carbon and 2-10 parts of nitrogen absorption agent. The process comprises integrating vanadium waste, lime, fluorite and silicon carbon into powder whose grain size is smaller than 0.5mm, then mixing according to proportion, melting with temperature of 600-800 DEG C, adding in nitrogen absorption agent in the process of premelting, taking out melted slag which is cooled down to constant temperature, thereby obtaining micro-alloying refining synthetic slag, and also adding right amount of binding agent to obtain phi 10-20mm ball synthetic slag which is dried with low temperature. Compared with the original synthetic slag, the property of micro-alloying refining synthetic slay of the invention increases over 20% in desulfuration, reduces over 10 minutes in refining time of the refining furnace thereby reaching below 30 minutes, and smelting consumption reduces 20KWh in one ton, and the service life of aluminum 1kg ladle in one ton steel increases 8-12 times.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and manufacturing, and in particular relates to a synthetic slag with functions of molten steel microalloying and out-of-furnace refining and a preparation method thereof. Background technique [0002] With the development of metallurgical technology, the performance requirements of steel are getting higher and higher, which requires that the molten steel has a high degree of purity. At the same time, the molten steel is alloyed by means of microalloying. At present, the addition of niobium, vanadium, titanium and other elements in the production of micro-alloyed steel is done by adding single-component alloys such as: ferroniobium, ferro-titanium, and ferro-vanadium to molten steel. Each of these alloys has certain disadvantages. Some of the elements have a strong chemical affinity with the oxygen in the molten steel, so when they are added to the molten steel, most of them participate in d...

AI Technical Summary

Problems solved by technology

However, practice has proved that these have not solved the problems of low yield of microalloying elements and high cost of steelmaking

[0005] In short, if the current refining synthetic slag does not contain microalloy components, the microalloying of steel needs to add expensive alloys separately. The disadvantages are: increased production costs, complicated processes, and increased labor intensity of workers

But the disadvantage is that the main components are vanadium concentrate or steelmaking vanadium slag and niobium concentrate or steelmaking niobium slag, and resources are scarce.

As we all know, titanium is the most abundant among microalloyed niobium, vanadium and titanium resources in China. However, the microalloying effect of titanium is obviously not as stable as that of niobium and vanadium. However, China's niobium resources are relatively scarce and concentrated. Brazil is the country with the largest niobium reserves, accounting for 94% of the world's total reserves, and more than 95% of China's identified Nb resources are mainly concentrated in Baiyun Obo, Inner Mongolia. The grade of niobium ore is low, and the paragenetic minerals are complex. The annual production capacity of Nb-Fe in my country is only 40-60 tons.