A kind of unfired clay-silica sol bonded aluminum silicate brick and its preparation method

Abstract

The invention specifically relates to a non-fired clay-silica sol bonded aluminum silicate brick and a preparation method thereof. The technical scheme is: grind 5-25 parts by mass of silica sol and 2-10 parts by mass of soft clay in a planetary ball mill for 4-6 hours to obtain mud. Mix and grind 30-40 parts of clinker fine powder and 1-20 parts of soft clay in a vibration mill for 2-3 hours to obtain premixed powder. Stir 50-55 parts of clinker coarse particles and 10-15 parts of clinker medium particles in a wheel mill, add the mud and 1-2 parts of silica sol and stir, add the premixed powder Stir the material to obtain a mixed mud material. The mixed mud is trapped for 6-8 hours, and machine-pressed, and the prepared green body is dried at 110-120°C for 24-30 hours, and the unfired clay-silica sol bonded aluminum silicate brick is obtained. The unfired clay-silica sol bonded aluminum silicate brick prepared by the invention has the characteristics of high strength at room temperature, high softening temperature under load, high refractoriness and low volume shrinkage.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a non-fired clay-silica sol bonded aluminum silicate brick and a preparation method thereof. Background technique [0002] High alumina bricks and clay bricks are two commonly used aluminum silicate refractories. Because of their high refractoriness, low price, strong resistance to slag erosion and high mechanical strength at high temperatures, they are widely used in cement, steel, glass and other industries. Such as blast furnace lining, hot blast furnace body, electric furnace roof, blast furnace hearth, reverberatory furnace and rotary kiln lining, as well as plugs and nozzle bricks for pouring systems. [0003] High-alumina bricks and clay bricks are generally fired at temperatures above 1300°C for a long time. Therefore, not only the energy consumption is high and the production cost is high, but also the heat island effect caused by high temperatu...

AI Technical Summary

Problems solved by technology

[0003] High-alumina bricks and clay bricks are generally fired at temperatures above 1300°C for a long time. Therefore, not only the energy consumption is high and the production cost is high, but also the heat island effect caused by high temperature and carbon emissions from fuels greatly increase the environmental load and seriously affect Realization of my country's Energy Saving and Consumption Reduction Target

[0004] At present, the commonly used non-fired high-alumina bricks mostly use phosphate as the binder and add a small amount of soft clay. Although the product has high strength at room temperature, due to the changeable crystal form of the phosphate binder itself, it is affected by the temperature and the ratio of the binder. And the pH value is greatly affected, and the quality is unstable; and the phosphate binder needs to be added in portions during the mixing process, and the process is more complicated

In addition, phosphate has a certain corrosion effect on metal components, and improper treatment of used phosphate products will cause eutrophication of water bodies and red tides

Clay, on the other hand, is only added as an additive and does not provide a good bond

[0005] Existing clay bricks use soft clay as a binder, and usually need to add pulp waste liquid to cooperate with it. Although the joint strength can be improved together, the pulp waste liquid often contains impurities such as sulfite and sodium sulfide, which have a negative effect on the clay brick. Refractoriness and load softening temperature have certain influence