工业分析思考题1-7章（The industrial analysis puzzle 1-7）.doc

工业分析思考题1-7章（The industrial analysis puzzle 1-7） Chapter 3. Silicate analysis 1. Which oxides are the main components of silicates? What are the common analytical methods for various components? 2. What are the characteristics of hydrofluoric acid in decomposing the sample? What sample decomposition is applicable? 3. The lysis method is often used in the decomposition of silicate samples. After the alkaline fusion, the samples are soaked in water. What are the ions in the main components in the precipitation? Which in the solution? 4, 6. Silica sand and sandstone are the main raw materials for producing glass. The main components are SiO2, which is Fe2O3, Al2O3, CaO, MgO, K2O, Na2O. Please design the system analysis method (can be simplified diagram). 8. The basic principle of the determination of sulfur in sulfate and sulphide by iodide method, and the principle and condition of determination of SO3 content in cement by BaSO4 weight method? 9. Test the main conditions of potassium fluoride for determination of silicon. 10. How many methods of determination of silicon in silicate samples? In what circumstances to choose what method is appropriate? 11. What is aging? BaSO4 precipitation and SiO2? Does nH2O precipitation need to be aged? Why? 12. Consult relevant materials and design the system analysis scheme process of sodium calcium silicate glass samples, ceramic ingredients and samples of raw materials and various types of refractory materials. 13. The principle of Fe2O3 determination of black raw materials was determined by sncl2-ticl3 combined reduction and K2Cr2O7 titration, and the main equations of Fe2O3 in black raw materials were determined by using aluminum wire and TiCl3 reduction-k2cr2o7 titration. 14. Determination of iron ore in iron ore by the method of K2Cr2O7: (1) why add H3PO4 before titration of K2Cr2O7 standard titration solution? After H3PO4, why titration? (2) in the mercury-free iron method, why use SnCl2 and TiCl3 to restore Fe3 +? Can I use