คีเนติกส์ของการละลายสังกะสีจากฝุ่นเตาอาร์กไฟฟ้า ด้วยโซเดียมไฮดรอกไซด์

• Main Author: ธีรพันธุ์ พิมพ์ทอง
• Other Authors: กอบบุญ หล่อทองคำ
• Format: Theses and Dissertations
• Language: Thai
• Published: จุฬาลงกรณ์มหาวิทยาลัย 1999
• Subjects: สังกะสี; โซเดียมไฮดรอกไซด์; เตาหลอมไฟฟ้า; ฝุ่นแร่
• Online Access: https://digiverse.chula.ac.th/Info/item/dc:57957
• Institution: Chulalongkorn University

Kinetics of zinc leaching from electric arc furnace dust obtained from Nakhon Thai Strip Mill Public Company was investigated. The variables studied include stirring speed, sodium hydroxide concentrations of 1.0 to 4.0 M, reaction temperature of 32 degree celcius to 95 degree celcius and percent solid cquals 0.2, 10 and 20 percent. The experimental results indicate that the rate of zinc leaching from the dust increases with increased NaOH concentration. The order of reaction with respect to sodium hydroxide concentration was determined by applying initial rate method and found to be 0.76 at 60 degree celcius. At higher temperature, the rate of zinc dissolution increases. Plots of 1-(1-F)" versus reaction time giving linear relationship indicating that a chemical reaction is the rate-determining step. The apparent activation energy was measured to be 10.78 Kcal/mol (45.28 KJ/mol). With increased percent solid in the leaching solution, rate of zinc extraction decreased. At high percent solid, the maximum zinc fraction reacted obtained will depend on the zinc solubility in NaOH solution which is lower at lower concentration of sodium hydroxide.