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It should be recalled again that the β-alumina and glass slag phases are not as tough as the α-alumina grains in white aluminum oxide. If sulfur and other metal compounds are oxidized during smelting, the sulfides formed during the smelting process continue to exist. For example, it is believed that sulfur has an affinity for iron, and iron sulfide is formed under chrome corundum reducing conditions.

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Sulfur in corundum white corundum tends to cause foaming and loose structure of products produced or used in high-temperature oxidizing atmospheres. Iron sulfide oxidizes in an oxidizing atmosphere above 1180 ° C, and sulfur becomes SOx gas. The vaporization and escape of sulfur will cause the generation of air bubbles, and the residual iron oxide will cause the local melting of brown corundum based on ceramic materials.(cheapest pink fused alumina manufacturers poland)

These white fused alumina bubbles and spots due to local melting can cause product scrap. Sulfur content in coke used as a reducing agent is generally regulated? Lt; 1%. The sulfur content in coal ranges from 1% to 10%. In some coals, sulfur already exists in the form of pyrite (FeS2). Since the smelting of green silicon carbide is performed in a reducing atmosphere, it is conceivable that pyrite will continue to exist during the smelting process.

(cheapest pink fused alumina manufacturers poland)In order to minimize sulfur pollution, low sulfur coal should be used as a reducing agent. If the sulfur content in the brown fused alumina price is less than 0.05%, there is no hindrance. Sulfur content should be analyzed using a total carbon tester with a burn-in method. There are two forms of carbon to be considered in aluminum oxide abrasive production. Activated carbon is the carbon source used for the reduction of bauxite to brown corundum.

Included carbon is large particles that have not been oxidized, such as graphite electrodes, furnace linings, and melt coating linings (when the white alumina furnace is a dump furnace). The amount of rhenium added is calculated by adding the theoretical amount of carbon required to reduce bauxite to the increase in carbon—within 10% for coke, and up to 25% for coal. Over-reduction will cause reduction of titanium oxide to a lower state black silicon carbide is reduced to aluminum carbide (Al4C3). 

(cheapest pink fused alumina manufacturers poland)Activated carbon and inclusion carbon. In an oxidizing atmosphere, the sulfides in black corundum are unstable as the temperature increases. The amount of carbon source used to reduce bauxite must be calculated to give brown corundum the ideal chemical composition. At high temperatures, aluminum carbide breaks down into aluminium oxide blasting hydroxide and biogas (methane).

The purpose of this incremental carbon is to compensate for pink corundum furnace losses. Improper mixing of raw materials or improper furnace operation may lead to over-reduction or under-reduction of bauxite. Under-reduction will cause high silica and high titania. According to the chemical composition and technical conditions of aluminum oxide grit, production of brown alumina should be avoided under over-reduced or under-reduced conditions.

(cheapest pink fused alumina manufacturers poland)Although the technical conditions of the silicon carbide abrasive chemical composition can be satisfied after mixing the materials beyond the technical conditions with the good materials, it cannot be accepted for the special end use. Over-reduction during the smelting process may cause the formation of white aluminum oxide abrasive 220 grit carbide, which is converted into alumina and CO2 in an oxidizing atmosphere.