Magnesian environment-friendly stemming for submerged arc furnaces and preparation method of magnesian environment-friendly stemming

Abstract

The invention relates to magnesian environment-friendly stemming for submerged arc furnaces and a preparation method of the magnesian environment-friendly stemming. According to the technical scheme,the method comprises the following steps of: preparing 40-60 wt% sintered magnesia, 5-15 wt% of magnesium arone, 10-20 wt% of zirconium mullite fine powder, 5-15 wt% of silicon carbide fine powder, 5-15 wt% of sillimanite fine powder, 5-10 wt% of sepiolite fine powder, 1-5 wt% of monatomic silicon fine powder, 1-5 wt% of ball clay micro powder, 1-5 wt% of microcrystalline graphite micro powder and1-2 wt% of strontium oxide micro powder as raw materials, and adding 0.1-0.3 wt% of polypropylene fiber, 1-3 wt% of trimethylglycine and 8-20 wt% of a composite binding agent based on the weight of the raw materials, carrying out wet grinding for 15-30 minutes, and carrying out mud extrusion molding by using a mud extruder to obtain the magnesium environment-friendly stemming for submerged arc furnaces. The prepared magnesium environment-friendly stemming for submerged arc furnaces has the characteristics of being environmentally friendly, long in storage time, good in oxidation resistance, high in strength, excellent in erosion resistance and capable of repairing an iron notch.

Description

technical field [0001] The invention belongs to the technical field of blasthole mud for submerged arc furnaces. In particular, it relates to a magnesia environment-friendly gun clay for a submerged arc furnace and a preparation method thereof. Background technique [0002] Submerged arc furnaces are essential equipment for smelting ferrosilicon, ferromanganese, ferrochromium and ferronickel in the ferroalloy industry. According to incomplete statistics, there are more than 30,000 submerged arc furnaces of various kinds in the country (Zeng Chaoze. Solved in the design of large-capacity submerged arc furnaces Effective approaches to electrical efficiency and thermal efficiency. Ferroalloys, 2010(41):pp26-29.). Taphole mud is one of the important refractory materials in submerged arc furnaces, and its performance directly affects production. Generally speaking, when the slag and iron are not produced, the taphole mud is filled in the taphole to maintain a sufficient depth; ...

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Problems solved by technology

"A taphole mud for submerged arc furnace and its preparation method" (CN105237012B) patent technology, using bauxite, kyanite, brown corundum, chromium oxide, silicon carbide and silicon micropowder as raw materials, and dihydrogen phosphate Aqueous aluminum solution is used as a binder, and the clay used for submerged arc furnaces is obtained by mixing, grinding and squeezing. The main disadvantage of this technology is that the chromium oxide used will pose a greater threat to human health and safety, and the phosphoric acid binder will increase Phosphorus element in metal smelting, and phosphoric acid hardens quickly, so it is difficult to preserve for a long time

"Alkaline anhydrous taphole mud for submerged electric furnace" (CN103896607B) patented technology, using fused magnesia, chrome sand, graphite chips, asphalt powder, spinel, rare earth oxides, cellulose and dextrin as raw materials, with Resin and tar are used as binders to prepare blast clay for submerged electric furnaces with better plasticity, but the material also contains chromium trioxide that pollutes the environment. The production and use of asphalt and tar pollute the environment a lot, and this technology is harmful to the environment. The problem of carbon oxidation in materials has not been effectively solved

"Environmentally friendly anhydrous taphole clay for submerged arc furnace and its preparation method" (CN106673677B) patent technology, using forsterite, magnesia, quartz, coke, pitch, silicon carbide, clay, nitride and kyanite as raw materials, and carbon Black oil and decrystallized anthracene oil are used as binders to make relatively environmentally friendly anhydrous taphole clay. The main disadvantage of this technology is that the material still contains asphalt that pollutes the environment, and adding too much clay and quartz will not only shrink the material after sintering If it is too large, the high temperature strength of the material will be low, and the corrosion resistance of the material will be significantly reduced