What is acidic refractory?

Acidic refractories are generally impervious to acidic materials but easily attacked by basic materials, and are thus used with acidic slag in acidic environments. They include substances such as silica, alumina, and fire clay brick refractories.

What are basic refractories?

Refractories are inorganic nonmetallic material which can withstand high temperature without undergoing physico – chemical changes while remaining in contact with molten slag, metal and gases. It is necessary to produce range of refractory materials with different properties to meet range of processing conditions.

Which refractory is preferred in basic conditions?

Of all the basic refractory materials, magnesite is mostly used in furnaces.

Which of the following is a part of acidic refractories?

Explanation: Silica containing refractories are referred to as silica or acid refractories. They possess a high-temperature capacity to withstand loads. The common types of acid refractories are silica, aluminum silica, alumina, and silimanite. 5.

What is dimensional stability of refractory?

Dimensional stability It is the resistance of a refractory to changes its volume when exposed to high temperatures for a long time.

What are refractories made of?

Refractories are ceramic materials capable of withstanding high temperatures. The bulk of refractory materials consist of single or mixed high melting point oxides such as silicon, aluminum, magnesium, calcium and zirconium.

Which of the following is not a basic refractory?

Chromate, Carbide, Mullite, etc. 4. Which one of the following is not a basic refractory? Explanation: Most of the silica-based refractories, like fire clay, bricks and sand are of acidic refractories.

How are refractories made?

Refractory manufacturing involves four processes: raw material processing, forming, firing, and final processing. Firing involves heating the refractory material to high temperatures in a periodic (batch) or continuous tunnel kiln to form the ceramic bond that gives the product its refractory properties.

What is a good refractory material?

A good refractory should have high RUL value. It is defined as the ratio of its pore volume to the bulk volume. Porosity is an important property of refractory bricks, because it affect many other characteristics like chemical stability, strength, abrasion- resistance and thermal conductivity.

How are Refactories made?

Refractories are produced from natural and synthetic materials, usually nonmetallic, or combinations of compounds and minerals such as alumina, fireclays, bauxite, chromite, dolomite, magnesite, silicon carbide, and zirconia.