What is the history of monolithic refractories?

Monolithic refractory material is a new type of refractory material, also known as non-burning refractory material or scattered refractory material, which can be directly used after delivery and molding and baking, without being fired in advance and loose mixture. With the material can be made into no joint lining and structures, so the monolithic refractory material. Monolithic refractories generally use cement as a binder. Here is a simple introduction to the history of monolithic refractories. According to the characteristics and application of monolithic refractories, it can be divided into three stages of development.

Here is the content list:

l The first stage

l The second stage

l The third stage

l Work performance

l The development direction

The first stage

The first stage is longer, from 1918 to the mid-1960s, mainly use the binder such as cement, water glass and phosphate, and made from ordinary refractory aggregate and powder not stereotypes refractories, the boiler, tube furnace, heat treatment furnace, heating furnace of steel rolling, chimney and, in areas such as the thermal equipment foundation is widely used.

The second stage

The second stage from the mid-1960s to 1970s, the developed aluminium sulphate and polyaluminium chloride, poly (sodium phosphate, aluminate cement and clay binder, successfully developed the refractory casting, gunning material, a combination of castable refractory plastic and clay and other new varieties, improves the high temperature performance of the material, increase the material way of construction, The application range of the material is expanded.

The third stage

The third stage began in the 1980s, using the composite binder, superfine powder and additive, with high purity alumina clinker, corundum, mullite, silicon carbide and synthetic raw materials, such as, configuration successfully low cement series refractory castables with refractory castables, such as new varieties, new technology, its characteristic is the combination, the sintering and the expansion, performance improved significantly.

At the present stage and in the future, refractories are the main type of monolithic refractories, which can be divided into four categories according to the cementing mode of castables: hydration bonded refractories, chemical bonded refractories (including polymerized bonded refractories), hydration and polymerization combined refractories and condensed bonded refractories.

Work performance

With the improvement of performance, the materials and varieties of monolithic refractories are expanded from acid and neutral oxides to basic oxides and oxides and non-oxide composite materials.

The development direction

The material of monolithic refractories is developing to high grade, high performance material and oxide - non - oxide composite material. Construction technology to the province of labor, time-saving, high-efficiency direction development. Baking technology is developing in the direction of fast and even free baking.

Monolithic refractory is a certain grain degree of aggregate, and fine powder, binder and additive mixing proportion of refractory materials, also known as particulate refractories, used in a variety of kiln lining thermal technology equipment, without sintering process, direct baking, compared with fire brick, has the characteristics of technology is simple, is advantageous for the mechanized construction, It is better than firebrick in some kilns and thermal equipment.