Definition of ladle stuffing sand
Ladle stuffing sand is the filling material for the nozzle at the bottom of the ladle.
Ladle stuffing sand is commonly used in smelting industry. The ladle stuffing sand has the advantages of good fluidity, good permeability, fast flow rate and resistance to molten steel erosion. Ladle stuffing sand is mainly used in the smelting process of metallurgical industry to improve the quality and output of steel and reduce product costs. Ladle stuffing sand is an indispensable refractory for tapping of eccentric furnace, i.e. ladle stuffing sand. It is mainly composed of forsterite and fused magnesia as the main raw materials and carbon material as the additive according to the specific particle size and weight percentage, and then mixed to prepare ladle stuffing sand, After trial use, it has been proved that the ladle stuffing sand has good dispersive fluidity, high refractoriness, no sintering, no clogging, 100% drainage rate of tapping rate, service temperature ≥ 1750℃, no chemical reaction with molten steel and alloy composition, no variability in storage quality, and can meet the requirements of steel-making process. It is an ideal refractory for eccentric furnace steelmaking.
Product characteristics of Fused Ceramic sand
1. Solid sphere: The shape of Ceramic Sand is spherical with smooth surface and less surface area and offering a very good flow ability and filling ability. To compare with other sands else, less binder is used at the same mold strength and higher venting ability. It also offers the excellent collapsibility.
2. Lower thermal expansion rate: It makes the dimensions of castings better, less crack and defect and higher output.
3. Lower breakage rate: Ceramic Sand has a higher density and a very lower breakage rate at the reclamation. It makes a better reclamation rate to reduce the waste sand to be favor to the environment.
4. High refractoriness: The major chemistry is Al2O3. PH appears neutral. It belongs to the refractoriness of the series of Aluminum and Silicon which has a very good refractory performance. It is suitable for all kinds of metal and alloy castings.
Advantages of Fused Ceramic sand in ladle stuffing sand
In the iron and steel smelting industry, the ladle stuffing sand of molten steel refining ladle is also popularized and applied at present, and its use specification is 30 mesh. In the production of ladle stuffing sand, Fused Ceramic sand has the advantages of replacing chromite sand: high refractoriness: the main component is aluminum oxide, so the refractoriness is ≥ 1820 ℃, and the thickness of the sintered layer can be reduced without excessive sintering at a certain molten steel temperature; Because the Fused Ceramic sand is round and the particles in the sintering layer are in point contact, the strength of the sintering layer can be effectively reduced and the ladle stuffing sand can be used for open casting; Spherical particle shape: the particle shape is close to the true circle, the surface is smooth, without concave convex veins, and its fluidity is good, which is conducive to pouring; In the ladle stuffing sand, according to the proportion, Fused Ceramic sand can be used completely, or part of Fused Ceramic sand can replace chromite sand, and the price is far lower than chromite sand; Low thermal expansion rate: it has low thermal conductivity and small expansion after heating, which can prevent shed materials; Contact with molten steel can form a protective layer, which can prevent the drainage from floating up and the molten steel from seeping / permeating. Attention shall be paid to during use. During tapping, the steel flow shall be prevented from directly impacting the ladle shape and affecting the gravity flow rate of open casting. The added drainage agent shall be stacked into a small ladle, and the center / center of the ladle shall be aligned with the ladle outlet.
Composition analysis of ladle stuffing sand
Nowadays, the main varieties of ladle drainage agent are chromite sand drainage agent and silica sand drainage agent. Chromite sand drainage agent has good performance, but it has serious environmental pollution and high cost; The silica sand drainage agent is not conducive to the free fall of sand filling, and the natural fluidity is poor, which is easy to cause shed material. Fused Ceramic sand as stuffing agent is an ideal substitute for chromite sand, and its particle shape is spherical, which can effectively reduce the strength of the sintered layer and is conducive to the pouring of ladle stuffing sand; In addition, its proportion is small and its cost is far lower than that of chromite ore.