Magnesia carbon brick used for steelmaking converter and preparation method of magnesia carbon brick

Abstract

The invention relates to a magnesia carbon brick used for a steelmaking converter and a preparation method of the magnesia carbon brick. The technical solution is that the method comprises the following steps: performing stirring on 78-93 wt% of fused magnesia granules, 0.1-2 wt% of an organic auxiliary agent and 5-20 wt% of absolute ethanol at a rotating speed of 300-600 rpm, performing drying, and performing sieving to obtain pretreated fused magnesia particles having particle sizes of 1-5 mm; performing stirring on 30-50 wt% of fused magnesia fine powder, 30-50 wt% of flake graphite, 5-10 wt% of an antioxidant, and 2-10 wt% of a surfactant at a rotating speed of 200-400 rpm to obtain pretreated powder; and uniformly mixing 50-65 wt% of the pretreated fused magnesia particles, 20-40 wt%of the pretreated powder, 1-10 wt% of fused magnesite fine powder, and 3-5 wt% of thermosetting phenolic resin, performing compression moulding, and performing curing to prepare the magnesia carbon brick used for the steelmaking converter. The method provided by the invention has the advantages of low production costs, a simple process and easy industrial production, and the prepared magnesia carbon brick used for the steelmaking converter has the advantages of high thermal shock stability, high high-temperature flexural strength and good corrosion resistance to slag.

Description

technical field [0001] The invention belongs to the technical field of magnesia-carbon bricks. In particular, it relates to a magnesia-carbon brick for a steelmaking converter and a preparation method thereof. Background technique [0002] The steelmaking converter is a vertical cylindrical furnace that does not require an external heating source and mainly uses liquid pig iron as raw material for steelmaking. Magnesia-carbon bricks have the characteristics of high refractoriness, good slag resistance, strong thermal shock resistance, good thermal conductivity, wear resistance, good spalling resistance, simple production process and energy saving, and have been used in converters, electric furnaces and refining furnaces. been widely applied. With the continuous improvement of the production process and product quality of magnesia carbon bricks, the furnace life of the converter is also increasing, which has laid a foundation for the reduction of steelmaking costs. [00...

AI Technical Summary

Problems solved by technology

[0003] In order to improve the quality of magnesia-carbon bricks for steelmaking converters, scientific and technological personnel have carried out a lot of research and development work on the selection and coordination of magnesia, carbonaceous raw materials, binders, antioxidants and other raw materials, but there are still some deficiencies: "One A high-performance magnesia-carbon brick and its preparation method” (CN201310454088.X) patented technology, which uses granular graphite instead of flake graphite to improve the yield and peeling resistance of the material, but the high-temperature flexural strength still needs to be further improved

"Converter magnesia-carbon brick and its preparation method" (201711138074.1) patented technology, using magnesia-carbon recycled materials as raw materials to prepare converter magnesia-carbon bricks, reduces production costs while comprehensively utilizing waste resources, but the recycled materials contain Impurities and low melting phase will adversely affect the high temperature performance of the product such as thermal shock stability

[0004] To sum up, the existing technology is still unable to take into account the optimization of material production cost, high temperature flexural strength, thermal shock stability and corrosion resistance, etc., which affects industrial production