Magnesium-calcium refractory material gunning mix

Abstract

The invention relates to the field of refractory materials, in particular to a gunning mix. A magnesium-calcium refractory material gunning mix comprises, by weight, the following raw materials: 75-85% of magnesia, 10-20% of limestone, 2-6% of quicklime powder and 0.5-3% of titanium oxide powder; the gunning mix also comprises binding agent, the addition amount of which is 3-6% of the main raw materials, and thickening agent, the addition amount of which is 0.1-0.2% of the main raw materials. According to the invention, calcium oxide raw materials such as calcium carbonate powder and lime powder are introduced in a large amount to react with sodium phosphate to generate Na2O. 2CaO. P2O5 (Na2Ca2P2O8) and 3CaO. P2O5 with high melting points, titanium oxide micro power is used for promoting sintering of the gunning mix under high temperature, the density and penetration resistance of the gunning mix is improved, the gunning mix has high high-temperature strength and fast coagulation performance, and the gunning mix is used in the parts easy-to-flush of a converter, an electric furnace and a RH refining furnace, has long service life, reduces the consumption of gunning mixes, can be widely used in the lining and the repair of the damaged part of the lining of the converter, the electric furnace, the RH refining furnace and other high-temperature industrial furnaces of steel-makingindustry.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a gunning material. Background technique [0002] At present, the gunning materials used in converters, electric furnaces and RH refining furnaces are mainly magnesia. For example, Chinese patent CN92101715.4 describes a kind of electric furnace gunning materials, mostly composed of fused magnesia as aggregate, and sodium tripolyphosphate, magnesium chloride And slaked lime is used as a binding agent, and one or more organic coagulants such as carboxymethyl cellulose, hydroxyethyl cellulose and alginic acid malonate are added. The weight proportion of the aggregate and the binder is: 100 parts of fused magnesia, 0.5-2.5 parts of sodium tripolyphosphate, 1.5-2.5 parts of magnesium chloride, and 1.5-2.5 parts of slaked lime. Chinese patent CN93111992.8 relates to a multi-component composite binder for the production of magnesium gunning material, including phosphate, silicate, ...

AI Technical Summary

Problems solved by technology

Due to the low calcium oxide content (less than 5%) of the gunning material and the introduction of low-temperature sintered material borax, the high-temperature strength is low, and the service life is difficult to meet the requirements of the steel plant.

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