Method for reusing and recycling waste generated from cement production process and system therefor

A method for reusing and recycling a waste generated from a cement production process, the method comprising:

• an electrodialysis step of electrodialyzing an aqueous solution containing potassium chloride to produce aqueous hydrochloric acid and an aqueous solution containing potassium hydroxide, the aqueous solution containing potassium chloride being obtained by washing chlorine bypass dust generated during production of a cement with water;
• a calcium dissolution step of adding a part of the aqueous hydrochloric acid obtained in the electrodialysis step to a calcium-containing waste and dissolving calcium to produce an aqueous solution containing a calcium ion;
• a separation step of adjusting a hydrogen ion concentration index of the aqueous solution containing a calcium ion and separating a component containing at least one selected from the group consisting of Si, Al, Mg, and heavy metal from the aqueous solution containing a calcium ion;
• a pH adjustment step of adjusting a pH of the aqueous solution containing a calcium ion having passed through the separation step using the potassium hydroxide produced through the electrodialysis;
• and
• a calcium carbonate production and recovery step of producing calcium carbonate and an aqueous solution containing potassium chloride using the aqueous solution containing a calcium ion of which the pH is adjusted through the pH adjustment step and carbon dioxide emitted from a cement production process, and recovering the calcium carbonate, wherein a part of the aqueous hydrochloric acid obtained in the electrodialysis step is used for preparing a vinyl chloride resin, and the calcium carbonate obtained in the calcium carbonate production and recovery step is used as a filler of the vinyl chloride resin.

A system for reusing and recycling a waste generated from a cement production process, the system comprising:

• electrodialysis means for electrodialyzing an aqueous solution containing potassium chloride to produce aqueous hydrochloric acid and an aqueous solution containing potassium hydroxide, the aqueous solution containing potassium chloride being obtained by washing chlorine bypass dust generated during production of a cement with water;
• calcium dissolution extraction means for adding a part of the aqueous hydrochloric acid obtained in the electrodialysis means to a calcium-containing waste and dissolving calcium to produce an aqueous solution containing a calcium ion;
• separation means for adjusting a hydrogen ion concentration index of the aqueous solution containing a calcium ion and separating a component containing at least one selected from the group consisting of Si, Al, Mg, and heavy metal from the aqueous solution containing a calcium ion;
• potassium carbonate production means for bringing carbon dioxide emitted from a cement production process into contact with the aqueous solution containing potassium hydroxide produced through the electrodialysis to produce an aqueous solution containing potassium carbonate;
• and
• calcium carbonate production and recovery means for producing calcium carbonate and an aqueous solution containing potassium chloride using the aqueous solution containing a calcium ion having passed through the separation means and the potassium carbonate, and recovering the calcium carbonate,
• wherein a part of the aqueous hydrochloric acid obtained in the electrodialysis means is used for preparing a vinyl chloride resin, and the calcium carbonate obtained in the calcium carbonate production and recovery means is used as a filler of the vinyl chloride resin.

A system for reusing and recycling a waste generated from a cement production process, the system comprising:

• electrodialysis means for electrodialyzing an aqueous solution containing potassium chloride to produce aqueous hydrochloric acid and an aqueous solution containing potassium hydroxide, the aqueous solution containing potassium chloride being obtained by washing chlorine bypass dust generated during production of a cement with water;
• calcium dissolution extraction means for adding a part of the aqueous hydrochloric acid obtained in the electrodialysis means to a calcium-containing waste and dissolving calcium to produce an aqueous solution containing a calcium ion;
• separation means for adjusting a hydrogen ion concentration index of the aqueous solution containing a calcium ion and separating a component containing at least one selected from the group consisting of Si, Al, Mg, and heavy metal from the aqueous solution containing a calcium ion;
• pH adjustment means for adjusting a pH of the aqueous solution containing a calcium ion having passed through the separation means using the potassium hydroxide produced through the electrodialysis;
• and
• calcium carbonate production and recovery means for producing calcium carbonate and an aqueous solution containing potassium chloride using the aqueous solution containing a calcium ion of which the pH is adjusted through the pH adjustment means and carbon dioxide emitted from a cement production process, and recovering the calcium carbonate, wherein a part of the aqueous hydrochloric acid obtained in the electrodialysis means is used for preparing a vinyl chloride resin, and the calcium carbonate obtained in the calcium carbonate production and recovery means is used as a filler of the vinyl chloride resin.