Preparation method of diffuse type permeable material

Abstract

The invention particularly relates to a preparation method of a diffuse type permeable material. The technical scheme of the method comprises the following steps: mixing 40-80wt% of carbonate ore, 1-50wt% of fused magnesia, 0.5-10wt% of additive and 0.5-12wt% of silica micropowder which are used as raw materials; additionally adding water of which the weight is 2-10wt% of that of raw materials, evenly mixing, and forming in a casting or mechanical press or isostatic pressing mode; and roasting for 8-36 hours at the temperature of 110 DEG C, and sintering for 2-10 hours at the temperature of 1600-1700 DGE C so as to obtain the diffuse type permeable material. The magnesium calcium diffuse type permeable material formed by in-situ decomposition has the advantages of uniform air permeability, rich raw material reserves, low cost, simple process and wide application prospect, and is beneficial to industrial production. The material prepared by the method has uniform air permeability, strong high-temperature strength and good thermal shock stability, and can be used for cleaning molten steel.

Description

technical field [0001] The invention belongs to the preparation technology in the field of inorganic non-metallic materials, and in particular relates to a preparation method of a dispersed air-permeable material. Background technique [0002] With the continuous development of iron and steel smelting technology, gas-permeable materials are also used as key functional components in the argon blowing process of molten steel refining outside the furnace and the desulfurization and dephosphorization of molten iron, and its role and quality have received attention. Argon blowing and stirring Blow inert gas such as argon into molten steel or molten iron through breathable materials, fully stir molten steel or molten iron, quickly disperse and melt alloys, deoxidizers, desulfurizers, etc. added to molten steel, so that the molten steel and molten iron Harmful inclusions float up to achieve uniform composition and temperature of molten steel or molten iron. If the design of the br...

AI Technical Summary

Problems solved by technology

If the design of the breathable material is unscientific, it will cause the flow rate of argon to be too large, which will blow through the liquid surface of the melt, resulting in molten steel or molten iron slag, or even violent splashing, which will increase the consumption of molten steel or molten iron and increase the inclusion; The flow rate is too small, the stirring effect on the melt is not ideal, and the processing time is prolonged

[0003] In the production of existing diffused air permeable bricks, some substances that can be burned out at high temperature are generally added, and after firing, the pores are left in the bricks to achieve the purpose of ventilation. A large number of high-purity raw materials and binders are used, so the cost of the diffused air permeable brick is very high, and a large amount of precious mineral resources are consumed, and many raw materials are produced by electric melting and other processes, and the energy consumption is very high.