The Precipitation Of Sparingly Soluble Inorganic Salts Such As, But Not Limited To, Calcium Carbonate, Calcium Phosphate, Barium Sulfate, Strontium Sulfate
And Silica, Ii.
Synthetic Strontium Sulfate
, A New Pigment Option for a Range of Coatings--Rasik Raythatha, Solvay Special Chem GBU
It is known that the common scaling of oil pipeline is calcareous carbonic, calcium sulfate, barium sulfate, strontium sulfate
, also including corrosion products (ferrous sulfide, ferrous sulfate) and precipitates which have high solubility, high content under certain conditions , which are mainly caused by the following four reasons.
Diagenetic (post-depositional) processes involving the circulation of low-temperature water (probably seawater, supplying the Sr) and the decomposition of organic material (yielding sulfate) resulted in strontium enrichment and the deposition of celestine (strontium sulfate
) crystals as geodes, nodules and concretions.
Products featured in the literature include aluminum silicates, alumina trihydrate, aromatic oils, ASTM reference oils, barium sulfate, blowing agents, calcium carbonate, kaolin clays, fatty acids, gilsonite, iron oxides, magnesium carbonates, magnesium hydroxide, magnesium oxide, microcrystalline wax, naphthenic oils, paraffinic oils, paraffin wax, petrolatums, plasticizers (phthalates), polymers (EPDM, polychloroprene and nitrile), precipitated silica, rubber accelerators, solvents, stearates, strontium sulfate
, sulfur, white mineral oils, zinc dust and zinc oxide.
There are radiolarians with a silicon skeleton, foraminifera with calcareous tests, and acantharians, which have an external skeleton of celestite, strontium sulfate
(SrSO4), a material that is hard and compact in the living acantharian, but which soon dissolves when it dies.
In most biological systems, preference in general is given to [Ca.sup.2+] over [Sr.sup.2+], although a marine organism, an Acantharia, constructs its internal skeleton of strontium sulfate