Preparation method of ceramic launder

Abstract

The invention discloses a preparation method of a ceramic launder. The ceramic launder comprises the following raw materials: 15-27% of metal silicon powder, 73-85% of silicon carbide powder and 0.5-2% of a binder based on the total mass The preparation method comprises the following steps: adding 5-8% of water based on the total mass of metal silicon powder and silicon carbide powder into the raw materials, and uniformly mixing for later use; moulding the prepared raw materials according to a shape mould of the launder; putting the moulded launder in a drying chamber to dry; putting the dried launder in a nitriding furnace, introducing nitrogen and nitriding and sintering; and discharging the sintered launder out of a kiln to obtain the ceramic launder. The preparation method disclosed by the invention is used for preparing the launder by combining silicon nitride with the silicon carbide material. A proper launder shape is moulded at one time according to high-temperature resistant and wear-resistant characteristics of the ceramic material. The ceramic launder prepared is not cooled by cooling water in the using process. The ceramic launder is long in service life and free from the risk of contact explosion with water.

Description

technical field

[0001] The invention relates to a preparation method of a launder, in particular to a preparation method of a ceramic launder. Background technique

[0002] During the smelting process of metal copper, it is necessary to direct the smelted copper liquid from the smelting furnace to the copper ladle or the copper casting mold, so as to facilitate the purification of metal copper in the next step. The distance from the smelting furnace to the copper ladle or the copper casting mold is generally about 3 to 20 meters, and a launder is needed to guide the flow of the copper liquid. The temperature of the molten copper is generally as high as 1200-1300°C, and it has a large specific gravity and is highly corrosive. There are few suitable materials that can ensure the normal use of the launder for a long time.

[0003] The document "Chinese Patent CN201828155U" discloses a copper liquid launder, which is made of copper, and is characterized in that aluminum silicat...