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Kandelium’s high-purity sulfur is an essential raw material for many branches of industry – for example, it has a variety of uses in the chemical industry and is utilized as a vulcanizing agent in the rubber processing industry. Kandelium’s sodium sulfide (Na2S) and sodium hydrosulfide (NaHS) are indispensable in applications as diverse as leather tanning, mining, water and waste treatment, and the production of various chemicals.
The chemical process of vulcanization is a vital step in rubber production. During vulcanization, sulfur forms cross-links – chains of sulfur atoms – between the individual polymer molecules.
Sulfur is incorporated into multiple inorganic and organic chemical processes as a sulfur source.
In mining, ore flotation is used to extract base metals like copper, lead, molybdenum, nickel, cobalt and zinc from sulfide ores. The flotation process is based on mineral particles’ difference in surface hydrophobicity, selectively capturing hydrophobic mineral particles. With modern methods, three or four sulfide minerals can be separated from the same ore. They are used as sulfidizing agents for metal oxide ores.
One of the most common methods for removing heavy metals from waste water and contaminated soil is through the formation of insoluble sulfides. Precipitation with sodium sulfide is highly effective in freeing water from cadmium, zinc, copper and lead cations, as well as from arsenic and selenium. The relatively low solubility of sulfides allows a high degree of metal reduction to be achieved in a short amount of time.
The leather industry relies on sodium sulfide as a depilatory agent. It is applied to animal hides to remove hair and prepare the hides for tanning. This effective dehairing method has the added benefit of also stripping the animal hide of its fat content.
Cotton fabrics are most commonly dyed with sulfur dyes. Sodium sulfide or sodium hydrosulfide are used as reducing agents to disintegrate the water-insoluble dye particles, making them water-soluble so they can be absorbed by the fabric.