The preparation of crystal form of Al（OH）3 from the deposited residues of anodizing lines in the process of producing aluminum was studied. Alkali is used to dissolve the residue, and then blow CO2 is bellowed in, f...The preparation of crystal form of Al（OH）3 from the deposited residues of anodizing lines in the process of producing aluminum was studied. Alkali is used to dissolve the residue, and then blow CO2 is bellowed in, finally a kind of useful crystal Al（OH）3 is accessed by hydrolysis. The yield of the crystal Al（OH）3 was affected by temperature, pH and flow rate of CO2. The experimental results showed that under constant stirring, the optimized conditions was to control the temperature of 75-85℃, pH 7.5-9.0, CO/flow rate 60-80 mL/min. Using this method, the purpose of recovering valuable resources of Al, cleaning up the environment, and recycling of the by-product of Na2CO3 was achieved. It was of good economic and social benefits.展开更多
文摘The preparation of crystal form of Al（OH）3 from the deposited residues of anodizing lines in the process of producing aluminum was studied. Alkali is used to dissolve the residue, and then blow CO2 is bellowed in, finally a kind of useful crystal Al（OH）3 is accessed by hydrolysis. The yield of the crystal Al（OH）3 was affected by temperature, pH and flow rate of CO2. The experimental results showed that under constant stirring, the optimized conditions was to control the temperature of 75-85℃, pH 7.5-9.0, CO/flow rate 60-80 mL/min. Using this method, the purpose of recovering valuable resources of Al, cleaning up the environment, and recycling of the by-product of Na2CO3 was achieved. It was of good economic and social benefits.
