A non-crusting high-magnesia tundish hollow particle covering agent and its production method

Abstract

The invention provides a non-crusting high-magnesium tundish hollow particle covering agent and a production method thereof. The non-crusting high-magnesium tundish hollow particle covering agent is prepared from raw materials comprising, by weight, 85-95 parts of 90 light-burnt magnesia powder or 91 dead-burned magnesia powder, 2-10 parts of calcite or magnesite powder, 1-6 parts of composite melting point modifier, 1-3.5 parts of composite bonding agent and less than or equal to 0.2 part of water reducing agent. Compared with the prior art, The non-crusting high-magnesium tundish hollow particle covering agent has the beneficial effects that for the first time, a potassium feldspar and forsterite composite material is introduced into a tundish magnesium covering agent; according to the magnesia-calcium oxide-silicon oxide ternary phase diagram, the melting point and viscosity of the product are adjusted reasonably, the hardening phenomenon of the covering agent is effectively eliminated, and the requirements of a steel mill for sampling, temperature measuring and other operations are met. The technology of the non-crusting high-magnesium tundish hollow particle covering agent isin the domestic leading position.

Description

technical field [0001] The invention relates to the technical field of covering agents for iron and steel smelting tundishes, in particular to a non-crusting, high-magnesium tundish hollow particle covering agent and a production method thereof. Background technique [0002] With the continuous improvement of steel production technology, the requirements for auxiliary materials for steelmaking are also getting higher and higher. The requirements for the molten steel heat preservation agent have developed from the original single heat preservation function to multiple functions such as heat preservation, prevention of secondary oxidation of the molten steel by the atmosphere, and adsorption of molten steel inclusions. At present, the thermal insulation covering agents for molten steel mainly include acidic thermal insulation covering agents and alkaline thermal insulation covering agents. Among them, the acid thermal insulation covering agent has good thermal insulation perf...

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Problems solved by technology

[0004] The object of the present invention is to provide a production method of a non-crusting high-magnesia tundish hollow particle covering agent. On the one hand, this product uses light-burned or heavy-burned magnesia as the main raw material, and adopts spray granulation technology to produce high-magnesium High-quality tundish hollow particle covering agent, due to the characteristics of the production process, the product has low bulk density and good thermal insulation, which meets the requirements of stainless steel smelting for high thermal insulation of the covering agent, and solves the problem of poor thermal insulation effect of high-magnesium covering agents; on the other hand According to the ternary phase diagram of magnesia-calcium oxide-silicon oxide, a mixture of potassium feldspar and forsterite was introduced to reasonably adjust the melting point of the magnesia covering agent, effectively eradicating the phenomenon of hardening of the covering agent

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