Scientific analysis of castable “appears white hair” phenomenon and effective solution

Castable material in using process often can see high alumina cement castable appeared on the surface of hanging “frost”, “long hair” “powder” “powder” phenomenon. In the common refractory castable surface and water to have loose gelatinous precipitate. These “frost” is because the cement particle surface castable not hydrated in water, forming supersaturated solution, then precipitated alumina sol and hydrated calcium aluminate induced. In fact, “white box” is not affect castables performance, but too much can cause rough skin on the construction, affecting the appearance.

Reason of castable long white: containing alkali refractory raw material, such as calcined alum refractory aggregate in, calcination sticky superior, as calcium aluminates cement castable. All kinds of powder, such as a variety of fine powder, silicon powder and kyanite; there are also contains alkali additives, such as reducing agent, coagulant, explosion-proof toughness. These materials often contain a small amount of alkali, the alkali, some can be dissolved in water, especially the dispersing agent of alkali, almost all into the wood. These “base” by capillary hole to the hardening decent migration, arrives at the table and then, the formation of carbonate and C02 reaction in the air.

Solution for casting material surface “frost” phenomenon:

1. Choosing low alkali content of refractory materials;
2. As soon as possible out of the water, drying, carrier to eliminate sodium alkali, stranded in the construction of the body, not to migrate to the surface.
3. The castable airtight, covered with plastic film, thereby preventing the moisture with alkali to migrate to the surface.
4. Improve the refractory castable viscosity and rapid hardening (reduce sodium migration velocity).
5. Strengthen quality control, strict control of water, to prevent too much water.

Korean customers come to visit our company

February 2014, Korean customers come to our factory to visit bauxite aggregate production (Bauxite aggregate is Particulate material which have been crushed, screened, without iron and other processes, typically specifications (mm) :0-1 ,1-3 ,3-5 ,5-8 ,8-15 ,15-50 ,0-5 ,0-50, also according to customer requirements specifications).

Relevant staff of the state of International Trade and Korean customers for the exchange and organized production plant visit, the ROK expressed satisfaction with my company's bauxite aggregate.

Korean customers a special trip to visit my company, aims to increase understanding of our products and production technology, hoping to take this opportunity to establish a formal partnership with the company to lay a solid foundation for future cooperation. The two sides had in-depth communication and cooperation agreement, the next step to determine the time signed an agreement of cooperation. South Korea expressed the hope long-term cooperation with our company, and hope that the cooperation can be extended to more refractory products.

Luoyang Yilong Refractory Co., Ltd. is a professional manufacturer which integrates designing, producing and servicing of the refractory material used for steel-making electric furnace,

steel ladle and middle ladle inmetallurgical industry. The main products of our company are Magnesia carbon brick, Alumina-magnesia-carbon brick, Magnesia-aluminum-carbon brick, Aluminum-magnesia spinel brick, Nozzle brick, Nozzle brick cup, Porous plug together with various unshaped refractory materials. Our products have been exported to many countries including Republic of Korea ,Kazakhstan, Thailand, Vietnam, Turkey, Ethiopia, Iran, Malaysia, Georgia, Angola, Ghana, Laos, North Korea, Nigeria, Pakistan, Iraq, Indonesia, Libya, Saudi Arabia and UAE (United Arab Emirates),etc.