Carbon-free brick binding agent adding method

Abstract

The invention discloses a method of adding carbonless brick binding material. The carbonless brick magnesium salt complex binding material is magnesium salt. The invention is characterized in that the invention adopts the compound addition of solid magnesium salt and magnesium salt solution. The adding amount of the solid magnesium salt is 0.5%-2% of that of the carbonless brick raw material while the adding amount of the magnesium salt solution is 3%-5% of that of the carbonless brick raw material. The technique process is as follows: first, adding carbonless brick particles into an edge runner wet mill, then, solid magnesium salt is added into the edge runner wet mill to be dryly mixed for 1-2 minutes to lead the solid magnesium salt to be uniformly distributed in the particles; adding in the magnesium salt solution with the amount of 3%-5% of the mixing material amount, and wet mixing is carried out for 1-2 minutes, then a mixing roll with a roller is adopted for mixing; putting powder material in and discharging is carried out after 8-13 minutes of wet mixing, finally, shaping by pressure and drying the half finished product under the temperature of 160-200 DEG C for more than 36 hours. Because the invention adds solid magnesium salt on the base of adding magnesium salt solution in the rolling mixture, the binding material concentration is enhanced. The method of adding complex binding material is simple in operation and low in cost, which enhances the quality of product and has wide popularization value.

Description

Technical field: [0001] The invention relates to a refractory material, in particular to a method for adding a binder suitable for producing carbon-free bricks lining ladles. Background technique: [0002] Carbon-free bricks are refractory bricks made of high-alumina or corundum granules, high-alumina or corundum powder, magnesium oxide particles or powder, and combined with a composite binder to form a certain shape and volume. [0003] At present, resins and magnesium salts are generally used as bonding agents for carbon-free bricks lining ladles at home and abroad. Although carbon-free bricks made of resin as a binder have high compressive strength at room temperature, the strength decreases due to decarburization and oxidation at high temperatures, and due to the addition of resin, carbon-free bricks produced from carbon-free raw materials still contain 1.5 to 2.5% carbon-free bricks. carbon. [0004] Magnesium salt solution is used as a binder for carbon-free bricks, ...

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the carbon-free brick with magnesium salt solution as binder has good high temperature performance and high temperature strength, and the carbon content is less than 0.1%, but magnesium salt solution as binder has disadvantages such as low normal temperature compressive strength.