Studies On The Regulation And Preparation Of CaCO₃ With Various Calcium Sources By Diethylene Glycol-Ethylenediamine Based Carbon Dioxide Storage Material

With the development of China’s industry,the demand for fresh water is increasing.The water consumption of acetylene industry and polyvinyl chloride industry is huge,and the main component of these wastewater is Ca（OH）₂.A large amount of Ca²⁺-riched waste water will not only cause a large accumulation of calcium carbide slag to occupy precious land resources,but also cause land desertification,groundwater pollution and other ecological problems.Although the current treatment method can remove the Ca²⁺in the wastewater,the added value of the product is very low.Therefore,the development of a high added value of Ca²⁺wastewater treatment method has great impetus to the utilization of calcium carbide slag in the resource utilization.In this study,calcium chloride,calcium nitrate,calcium bromide and calcium acetate were used as calcium sources and diethylene glycol-ethylenediamine based CO₂SM as carbon source,and CaCO₃ crystals were synthesized.In this process,CO₂SM not only provides carbonate ions for CaCO₃ growth,but also functions as a crystal regulator.Secondly,calcium carbonate was prepared by atomization.Calcium carbonate crystals were prepared with calcium hydroxide as raw materials.The preparation conditions were as follows:[Ca（OH）₂]=0.014 M,gas flow velocity=43.9 L/min and liquid flow velocity=33.1 mL/min;Then the universal applicability of the atomization method was investigated with carbide slag,barium hydroxide and strontium hydroxide respectively.Atomization method has universal applicability in the preparation of alkaline earth carbonate.Finally,the application of CaCO₃ and CaO prepared by calcinating was preliminarily explored.CaO crystals were prepared by calcinating dumbbell-like,wheat spike-like and microsphere-like CaCO₃ precuesors,which was prepared by hydrothermal synthesis.Subsequently,the maximum adsorption amount of CaO was 16.32 mg CO₂/g CaO for the simulated flue gas at room temperature and atmospheric.Besides,the properties of as-maded paper were studied.The whiteness of the paper added with CaCO₃ increased by 3.3 with the amount of CaCO₃ added to 11.4%.This work can promote the development of Ca²⁺removal in solution,carbide slag comprehensive utilization and new CaO preparation.