Abstract: The separation of copper and molybdenum usually was realized by suppressing copper and floating molybdenum in high alkaline copper-molybdenum concentrate pulp. During the filtration process of high alkaline copper-molybdenum concentrate,the filter cloth would be blocked and hardened easily,which reduced the efficiency and even affected the normal production seriously. Different recycling experiments of filter cloth have been studied for solving the common problems in the filtration of copper concentrate,based on the analysis of blockage failure reason of the filter cloth. The results showed that: ①The acetic acid has the best cleaning performance among all kinds of acids,because acetic acid can react with the components embedded in the filter cloth,and even soften filter cloth and recover the fiber's elastic. ②Acetic acid+ultrasonic cleaning: The greater ultrasonic power and the lower frequency make better cleaning effect. ③Acetic acid+heating cleaning: Properly increasing temperature is helpful to improve the cleaning efficiency. ④Acetic acid + ultrasound + heating cleaning: The permeable rate of renewed filter cloth was 5.73×10^-3 m/s,after cleaning of 3 d' filter cloth (with permeable rate of 3.09×10^-3 m/s) for 30 min,under the conditions of acetic acid solution 10%,temperature at 60 ℃,ultrasonic frequency 20 kHz and the power 80 W/L. This result was so close to the new filter cloth,which indicated that this cleaning could achieve the recylcing of the filter cloth.

Key words: High alkaline copper concentrate, Failure of filter cloth, Recylcing of filter cloth, Acetic acid cleaning, Ultrasonic cleaning, Heating cleaning