Recovery of CO2 emission by boron solutions and conversion to conomically valuable products

It is very important for Turkish and World industry to use CO2, one of the major greenhouse gases causing global warming, as an ingredient to decrease CO2 emission level and so its hazardous effects on the environment. Besides, though Turkey has great boron reserves, it is also quite important to recover boron products from boron solutions and waste solutions for our economy and industry. In this study, the main purpose was to decrease emission of CO2 and lower the greenhouse gases effect on environment, which is the biggest problem of the developed countries nowadays.During this study, not only maxsimum CO2 absorption but also production of a mixture which can be used as ingredient in glass industry containing NaHCO3 and boron together were aimed. Flue gas taken from Bandırma Boron and Acid Plant and pure CO2 gas were used during laboratory, pilot and industrial scale works. CO2 absorption was investigated and sodium-borate solutions containing NaHCO3 were produced in four different systems in laboratory scale works. Products were characterized by XRD and chemical analysis. In laboratory scale works, borate solutions with 92,4 % NaHCO3 content was obtained and after purification this ratio was increased up to 98-99%. In industrial scale works, flue gas obtained from the steam station with flow rate of 100.000 m3/h was passed through the waste treatment solutions of the Eti Mine Boron Plant Works and solids containing 99 % CaCO3 was precipitated by absorbing CO2. In studies in which waste treatment solutions were used, 60% and 97,6 % CO2 absorption capacity was reached in the industrial scale and laboratory scale works respectively. Gas passed through the waste treatment solutions was than treated with the boron solutions and finally 99,5 % CO3 absorption capacity was reached.