Л. С. Получение концентрированного раствора каустической соды и буркеита из слабых растворов каустификации реферат
жүктеу/скачать 1,48 Mb.
|
Дилдора-статья
- Бұл бет үшін навигация:
- Abstract .
| Kalit so'zlar: eruvchanlik diagrammasi, kristallanish, kaltsinatsiyalangan soda, mirabilit, burkeit, natriy gidroksid, ohak suti.
Xususiyatlari: - natriy sulfat-karbonatining qo'sh tuzlarini kimyoviy, mikroskopik va rentgenofazoviy tahlil usullari bilan o’rganildi; - bug’latilgan eritmalarning reologik xususiyatlari aniqlandi.
PREPARATION OF CONCENTRATED SOLUTION OF CAUSTIC SODA AND BURKEYITE FROM WEAK CAUSTIFICATION SOLUTIONS Abstract. Background.By the nature of the distribution in the solubility diagram of the Na2CO3-Na2SO4-NaOH-H2O system of crystallization regions of sodium sulfates and carbonates, their crystalline hydrates and double salts, the development of a technology for obtaining double sulfate-carbonate salts and sodium hydroxide from weak causticization solutions, which can be used in the production of synthetic detergents funds and glass industry with the replacement of imported sodium sulfate with local natural mirabilite. Purpose. The aim of the study is to determine the optimal conditions for obtaining a double salt of sodium sulfate-carbonate and sodium hydroxide from soda ash and lime milk in the presence of mirabilite. Methodology. The system Na2CO3-Na2SO4-H2O was studied by the isothermal solubility method; Na2CO3-NaOH-H2O; Na2SO4-NaOH-H2Oat temperatures of 25.50.75 and 100 ° C. The crystallization fields Na2SO4·2H2O, Na2SO4, Na2CO3·7H2O, Na2CO3·H2O and the double salt 2Na2SO4·Na2CO3 are delimited. Originality.The theoretical substantiation of the process of interaction of sodium carbonates, sulfates and hydroxides in three-component systems 2Na + // SO42, CO3 - H2O is carried out; 2Na + // SO4-2, 2OH - H2O; 2Na + // CO3-2, 2OH -H2O at 25-100 0С, which are the basic part of the one cationic four-component system 2Na + // SO42-, CO32-, 2OH - H2O. Based on the data obtained from literature and experimental studies, a diagram of the phase equilibria of the 2Na + // SO42-, CO3 - H2O system at 25 and 1000C was constructed. Received data. Chemical and X-ray phase analyzes have established the composition of intermediate products formed during the evaporation of weak solutions of causticizing soda ash with milk of lime in the presence of mirabilite. Key words: solubility chart, crystallization, soda ash, mirabilite, burkeite, sodium hydroxide, milk of lime. Features: - chemical, microscopic and X-ray phase analyzes investigated double salts of sodium sulfate-carbonate; -determined the rheological properties of one stripped off solutions. жүктеу/скачать 1,48 Mb. Достарыңызбен бөлісу:
|