Thiourea, also known as thiocarbamide (CAS No.: 62-56-6), has a molecular formula of SCN₂H₄, is a white, shiny rhombic hexahedron, tastes bitter, has a density of 1.405 g/cm3, is easily soluble in water, and its aqueous solution is neutral. Sulfur has low toxicity, is non-corrosive, and does no harm to the human body. Sulfur can dissolve gold, which has been confirmed by experiments. In the presence of an oxidant, gold is transferred into the thiourea acid solution in the form of Au(SCN₂H₄)²⁺ complex cations. Thiourea gold dissolution is an electrochemical corrosion process, and other chemical equations can be expressed as follows:
Stabilizing Fixing Solution Components: The main component of the fixing solution, sodium thiosulfate, easily decomposes under acidic conditions. Thiourea has a certain alkalinity, which can neutralize some of the acidic substances in the fixing solution, adjusting and stabilizing the pH value of the fixing solution, inhibiting the decomposition of sodium thiosulfate, thereby extending the lifespan of the fixing solution.Complexing
Inhibition of Sodium Thiosulfate Decomposition: Sodium thiosulfate (Hypo) in the fixing solution is unstable under acidic conditions and is prone to decomposition reactions. Thiourea has a certain alkalinity, which can neutralize some of the acidic substances in the fixing solution, keeping the pH value of the fixing solution within a relatively stable range, thereby inhibiting the decomposition of sodium thiosulfate.
Thiourea is a sulfur-containing organic compound with the chemical formula SC(NH₂)₂. Due to its unique chemical properties, it has many important applications in the medical field. The following are the main uses of thiourea in medicine:
1.Gold sulphide ore Flotation stage: Xanthate was mainly used: the dosage of butyl xanthate was 150-250 g/t, and thiourea was used as an auxiliary collector (30-80 g/t) to enhance the stability of hydrophobic membranes. Synergistic mechanism: thiourea forms hydrogen bonds with the dithiocarboxyl group (-OCSS⁻) of xanthate through the thiol group (-SH) to increase the adsorption density. Typical case: A gold sulfide mine uses "xanthate (200 g/t) thiourea (50 g/t)", and the gold recovery rate is increased by 8.2%.
Thiourea, also known as thiocarbamide or sulfourea, CAS number: 62-56-6, is an organic compound containing sulfur atoms, which can be used to prepare fumaric acid.
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