Slag-trapping covering agent for casting and its pre-treating process

Abstract

A slag-trapping covering agent for casting, especially for front ladle or induction-type electric furnace is prepared from pearlite, quartizite and fluorite through crushing, sieving by 40-70 meshes, mixing them proportionally, baking at 200-400 deg.C for 5-60 min, and mixing with cryolite and borax. Its advantages include better puffing nature on surface of molten iron or steel, wide temp range, easy trapping slag but not breaking, and no deposit on ladle wall.

Description

technical field [0001] The invention belongs to a kind of slag collecting and covering agent used for collecting slag, removing slag and covering heat preservation in the front ladle of cast iron and cast steel furnaces, and for slag collecting and removing slag on the liquid surface in the furnace when induction electric furnace smelts cast iron and cast steel and its pretreatment process . technical background [0002] In the foundry industry of our country, there are two main types of slag collecting and covering agents used in the furnace ladle: one is straw ash; the other is perlite. Perlite or nothing is used for slag collection and slag removal in the induction furnace. Straw ash has a wide range of sources and is cheap, but its fatal shortcomings are pollution of the environment and deterioration of working conditions. As a result, its usage has continued to decline. The price of perlite is not expensive, and the working conditions are better when used, but there ...

AI Technical Summary

Problems solved by technology

The price of perlite is not expensive, and the working conditions are better when used, but there are many problems: it is sensitive to temperature when expanding, sometimes it will not expand well when the temperature of molten iron fluctuates, and unexpanded perlite may cause slag inclusion in castings during pouring danger; the puffed slag collection layer is not viscous enough, and it is easy to break when removing slag, resulting in dirty or difficult slag removal; the puffed slag collection layer is serious to the wall of the ladle

Although it has a certain effect on improving the effect of perlite, its effect is still very limited, and the introduction of glass slag or straw ash has brought some new problems