Do you know the requirements and selection of refractory materials for ore-heating furnace?

Ore-heating furnace for the reduction of metal oxide ore smelting, so also known as ore-heating reduction furnace.

Used for the production of ferroalloys ore-heated arc furnace called ferroalloy furnace: for the production of calcium carbide called calcium carbide furnace: for the production of yellow phosphorus called yellow phosphorus furnace: for the production of matte called matte furnace: for refining ferroalloys called matte mineral heat treatment furnace: for smelting, metal and slag separation of pre-reduction furnace charge, called smelting furnace.

The furnace chamber built with refractory materials for the lining masonry. Because the mineral heat treatment furnace melt pool not only subject to strong high temperature effect, but also by the charge, high temperature furnace gas, iron and high temperature slag scouring and mechanical scouring, so the need to choose a specific refractory materials.

Requirements for refractory materials: high refractoriness, high temperature shape, volume can have a large change, high temperature strength, slag resistance, high temperature chemical stability, refractory materials should be kept neat appearance, structural integrity, no defects, no surface cracks.

In the mine furnace masonry, mainly refractory bricks as refractory materials, refractory castables as auxiliary materials. Material selection is as follows.

1. Carbon brick

Carbon brick is a kind of carbon material. It is made of crushed coke and anthracite. Its specifications are: cross section 400mm x 400mm (allowable error ± 30mm), length 800~1600mm (allowable error ± 5mm).

The advantages of carbon bricks are high refractoriness, strong thermal shock resistance and high compressive strength. Good stability, good volume stability and good slag resistance. However, it is easy to oxidize at high temperature, and the oxidation rate will be accelerated with the increase of temperature.

Therefore, carbon materials cannot be in contact with air, water vapor and other gases at high temperatures. Carbon materials have high thermal conductivity and poor thermal insulation. In the mine furnace, all smelting is not afraid of carburization species, you can use carbon brick as lining material, mine furnace with self-fired carbon brick

2. Magnesium brick for mineral furnace

The main component of magnesium brick is magnesium sand, its refractoriness in 2273K or more, alkali resistance is very strong. But the load softening point is low, poor thermal shock resistance. Refining furnace is mostly alkaline environment smelting, should choose alkali erosion resistant alkaline refractory materials, such as magnesium bricks for lining.

3. Clay brick

Clay brick is a weak acid refractory material, can resist acid slag erosion, can not be used at high temperatures.

To sum up, the choice of refractory materials for mineral-heating furnace should be based on the actual smelting environment and smelting raw materials for professional configuration. Mineral hot furnace melting pool can also use high alumina bricks instead of clay bricks. Amorphous refractory materials mainly consist of cold mash and high alumina castables.