Recovery and reuse method of quartz powder waste in outside-of-tube deposition process

A method for recovering quartz powder waste in an out-of-tube deposition process, comprising steps of:

• (1) acid washing:
• reacting a quartz powder collected in the treatment of a tail gas from deposition of an optical fiber preform rod in a hydrochloric acid solution, precipitating the quartz powder out and draining the acid solution on surface thereof, and washing the quartz powder with pure water;
• (2) separation:
• draining the surface water from the quartz powder diluted with pure water obtained in Step (1), centrifuging, and separating the quartz powder;
• (3) drying:
• drying the quartz powder obtained in Step (2) in a dryer lined with high-purity quartz and drying to a moisture content of 2% or less;
• (4) calcinating:
• calcinating the quartz powder dried in Step (3) in a device lined with high-purity quartz;
• (5) crushing:
• taking out the calcinated final product, placing in a device lined with high-purity quartz, crushing and grinding to an average particle size of 0.2-1 mm;
• and
• (6) pre-water removal:
• placing the ground quartz powder in a sealed container, and introducing a nitrogen-chlorine mixture containing 15%-25% chlorine.