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Up to the 1970s, commercial quantities of sulfuric acid were produced from anhydrous calcium sulfate. [14] Upon being mixed with shale or marl, and roasted at 1400°C, the sulfate liberates sulfur dioxide gas, a precursor to sulfuric acid. The reaction also produces calcium silicate, used in cement clinker production. [15] [16]
Phosphogypsum is a by-product from the production of phosphoric acid by treating phosphate ore with sulfuric acid according to the following reaction: . Ca 5 (PO 4) 3 X + 5 H 2 SO 4 + 10 H 2 O → 3 H 3 PO 4 + 5 (CaSO 4 · 2 H 2 O) + HX
Sulfuric acid is rarely encountered naturally on Earth in anhydrous form, due to its great affinity for water. Dilute sulfuric acid is a constituent of acid rain, which is formed by atmospheric oxidation of sulfur dioxide in the presence of water – i.e. oxidation of sulfurous acid. When sulfur-containing fuels such as coal or oil are burned ...
The sulfuric acid dissolves the carbonates in the hardened cement paste (HCP), and also calcium hydroxide (portlandite: Ca(OH) 2) and calcium silicate hydrate (CaO·SiO 2 ·nH 2 O), and causes strength loss, as well as producing sulfates which are harmful to concrete.
Using sulfuric acid, fluorapatite is converted to a mixture of Ca(H 2 PO 4) 2 and CaSO 4. This solid is called single superphosphate. Residual HF typically reacts with silicate minerals co-mingled with the phosphate ores to produce hexafluorosilicic acid (H 2 SiF 6).
Calcium fluoride is the inorganic compound of the elements calcium and ... Hydrogen fluoride is liberated from the mineral by the action of concentrated sulfuric acid ...
About 2.2:1 is the ratio (by weight) for compounding sulfur and quicklime; this makes the highest proportion of calcium pentasulfide. If calcium hydroxide (builders or hydrated lime) is used, an increase by 1/3 or more (to 115 g/L or more) might be used with the 192 g/L of sulfur. If the quicklime is 85%, 90%, or 95% pure, use 101 g/L, 96 g/L ...
Nitrating acid mixtures, spent with more than 50 percent nitric acid or Nitrating acid mixtures, spent with not more than 50 percent nitric acid UN 1827: 8: Stannic chloride, anhydrous UN 1828: 8: Sulfur chlorides: UN 1829: 8: Sulfur trioxide, inhibited or Sulfur trioxide, stabilized UN 1830: 8: Sulfuric acid with more than 51 percent acid UN ...
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