Production process of chromium drainage sand
Drainage agent is known as drainage sand in the world. It is divided into various series of products such as chromium, zirconium and silicon. According to the different conditions of each steel plant, the products suitable for production are selected, and they are mainly used in steel and refined colors.
Chromium drainage sand is often in a high temperature state for a long time in the ladle nozzle, therefore, the required refractoriness is relatively high. Because the drainage sand is filled into the nozzle, it is directly affected by steel. Therefore, the sintering temperature should not be too high; in order to prevent the huge net pressure of molten steel during use and prevent the shed material, a certain amount of lubricant should be added to reduce the friction between the drainage sand particles.
The automatic pouring rate of chromium drainage sand is over 95% on average. General siliceous and magnesia drainage agents are suitable for short-flow steelmaking processes; ordinary chromium drainage agents are suitable for steelmaking processes with refining time less than 45 seconds or without refining; the main function of chromium drainage sand is to greatly improve the automatic opening of ladle Pouring rate. Combining the working principle of the drainage sand in the LF/VD ladle nozzle, the physical properties of the four kinds of chromium drainage sand are analyzed. The number: #chromic drainage sand is used as the LF/VD ladle in the first workshop of the Panchang Steel Steelmaking Plant. Filling materials for the nozzle and improving the use state of the ladle in actual production, so that the automatic pouring rate of the ladle can be greatly increased, thereby increasing the production efficiency. The chromium drainage agent is selected from imported high-purity chromium sand as the main raw material, and is matched with refined ball silica sand. After reasonable particle size grading, the refined chromium drainage agent is suitable for LF, VD, RH and other steelmaking processes with a long refining time. ;Stainless steel chromium drainage agent is suitable for stainless steel series; thin plate drainage agent is suitable for various cross-section thin plate steelmaking processes. It is scientifically formulated with advanced production technology. It has the characteristics of high natural pouring rate (more than 98% under normal conditions), strong adaptability, long storage time of molten steel (3-4 hours), and reasonable price.
Due to the long transit time of the molten iron ladle, the temperature loss is serious. To solve this problem, iron ladle covering agent. Applicable scope: This product is suitable for die casting, continuous casting and casting ladle sliding nozzle drainage casting. Variety: According to different steel grades and casting requirements, the products are divided into two series: siliceous drainage sand and chromium drainage sand.
Chromium drainage sand is often in a high temperature state for a long time in the ladle nozzle, therefore, the required refractoriness is relatively high. Because the drainage sand is filled into the nozzle, it is directly affected by steel. Therefore, the sintering temperature should not be too high; in order to prevent the huge net pressure of molten steel during use and prevent the shed material, a certain amount of lubricant should be added to reduce the friction between the drainage sand particles.