What is the choice of binder for refractories?

There are many kinds of binders for refractories, and the bonding mechanism is different. Therefore, in actual production and use, binders should be selected according to the material, forming or construction methods of refractories and the requirements for the performance of refractories.

Matching Principle of Material: The selected binder should be compatible with the properties of refractory materials used. For aluminium silicate and corundum refractories, acidic binders such as phosphoric acid, aluminium dihydrogen phosphate and aluminium sulfate can be selected, while alkaline binders such as sodium silicate, sodium triphosphate and sodium hexametaphosphate should be selected for magnesium, magnesium aluminium or aluminium magnesium, magnesium chromium and other alkaline or weak alkaline refractories, and carbon binders such as asphalt and phenolic resin can be used for carbon or silicon carbide refractories. Mixture.

(2) Whether the products have been fired or not: Pressed or rammed fired refractory products can be made with temporary binders, such as pulp waste liquor, dextrin, hydroxymethyl cellulose and starch; Pressed or rammed non-fired products should be made with permanent binders.

(3) Unshaped refractories: In addition to material matching and final performance meeting the requirements, the adaptability of application methods should also be considered, that is, the influence of hardening mode and hardening time of binder on rheological property, wettability, cohesion and spreading of materials. Castables should choose binders which can produce hydration, chemical bonding or coagulation bonding, such as aluminium silicate and corundum castables, calcium aluminate cement, phosphoric acid or aluminium dihydrogen phosphate hardener, sodium fluorinated silicate hardener for water glass, superfine oxide powder and dispersant and late hardener, etc. as binders; plastics and ramming materials should choose energy of gas hardness to produce chemical bonding. Binders such as phosphoric acid, aluminium dihydrogen phosphate, aluminium sulfate and bonded clay can be used as binders for aluminium silicate plastics; binders that can produce chemical or hydration bonds should be selected for spraying materials, such as alkaline (magnesium) spraying materials, polyphosphate (sodium tripolyphosphate or sodium hexametaphosphate) or hydroxymethyl cellulose as binders, or aluminate as binders. Calcium cement is used as binder (for cold spraying), while pure calcium aluminate cement, solid aluminium dihydrogen phosphate and solid sodium silicate are used as binder for aluminium silicate spraying or spraying. Gas-hardening or hot-hardening binder should be selected for refractory mud Min.

 Yucai Phosphate Chemical Plant specializes in producing: sodium hexametaphosphate, sodium pyrophosphate, sodium tripolyphosphate, disodium hydrogen phosphate, industrial phosphoric acid, trisodium phosphate, aluminium dihydrogen phosphate, solid aluminium dihydrogen phosphate, liquid aluminium dihydrogen phosphate, sodium dihydrogen phosphate and other phosphate products after more than 30 years of continuous pursuit and development, relying on skilled chemical technology and product development, equipment updating and many other phosphate products. Colleges and universities have established a good cooperative and sharing relationship, playing a brand (Yucai Phosphate) in the chemical industry!