چكيده به لاتين
Nanostructured enstatite are of great importance due to their bioactivity and mechanical properties in bone tissue engineering applications, and the research and development of this biomarker has been increasing. The institute is a mineral name and a solid soluble phase in serpentinite or magnesite ore, which is found to be rarely found in nature. A large amount of serpentine waste is produced annually during magnesite ore extraction in Iran. Serpentin mineral waste is chosen because of its very low price and suitable magnesiosilicate source as the main raw material in this research. The required precursors for the synthesis of nanopowders, including molybdenum sulfate heptahydrate (MgSO4.7H2O) and sodium silicate pentahydrate (Na2SiO3.5H2O), are synthesized. At first, the mineral waste was isolated by acidic leaching with sulfuric acid and silty unsalted solid silicon from serpentine ore. Then a green-yellow liquor was found containing magnesium, aluminum, iron, chromium and nickel ions. Sodium silicate solution was made from leachate (sedimentary silica). Factors affecting the acid leaching process of serpentine mineral deposits include reaction temperature, reaction time, and acid concentration. To purify the magnesium sulfate solution, iron II was converted into iron III by adding oxygen to the oxidizing agent. Then, by adding calcite magnesia, a clay sediment with Fe2O3.H2O formula containing small quantities of aluminum, chromium and nickel in red-brown ions at pH 7.5 was removed from the processing circuit as a sludge. To ensure the release of nickel, a chemically-based method was tested with a D-dimethyl glyoxime complexer and it was determined that magnesium sulfate solution had reached high purity. As a result, a solid and clear solution of magnesium sulfate was obtained. After preparation and pre-purification of the precursor, a co-extrusion method with the help of surfactant was used to make the nanopowder of the institute. In the co-ordination method, the factors affecting the process including concentration of solutions, surfactant concentration and calcination temperature were investigated. In this method, a solution of sodium silicate was slowly formed in a solution of magnesium sulfate with a molar ratio of Mg / Si = 1.2 / 1 titres and hydrogel precipitation of MgO.SiO2.xH2O. 5 times rinsed in double-squared water and alcohol was extracted from a clean gel center. The sample was then dried at 120 ° C for 24 hours and calcined at 2 ° C for 8 hours at a temperature of 850 ° C. The average size of nanopowder crystals of 18 nm and single-phase was determined according to XRD analysis.
