1. Extraction of metallic Lead From cathode Ray tube
المؤتمـر العلمي الاول لبحوث طلبة الدراسات العليا ونتاجات وابداعات طلبة المراحل المنتهية
صور الباحثين
صوره المشرف
Extraction of metallic Lead From cathode Ray tube
(funnel glass)
Introduction
In this study we use pyrovacuum process. In the Pyrovacuum process , lead oxide in funnel glass is considered to be firstly reduced to metallic lead .then the lead evaporated into gaseous phase and was recovered after cooled down . Temperature , Pressure is key factor for both lead oxide reduction and metallic lead evaporation .
1) process chamber (2) graphite heaters (3) temperature control device (4) quartz boat (5) CRT powder (6 and 7) inlet and outlet of water cooling device (8) vacuum gauge (9) vacuum valve (10) vacuum pump (11) argon gas (12) flow meter
In the past few decades , (CRT) is widely equipped in TV and computer devices as an important part of monitors .
In recent years , due to the rapid development of monitor technology , CRT is replaced by liquid crystal display (LCD) gradually . Therefore , amount of waste CRT is increasing sharply around the world .
CRT consists of leaded glass which belongs to hazardous waste . Lead is one kind of metal , which is harmful to human health .
The disposal and treatment of leaded glass have become one of the hotspots and difficultties in the disposal field of e-waste .
Due to the stability of lead covered in glass matrix , the lead separation from glass is hard .
Extraction
Lead oxide
Carbon adding
reduction DD .
Metallic lead
evaporation
condensation
Lead
The main part that hold lead in CRT is funnel glass (belong to hazardous waste ) , the lead content ranges from 22-25% .
The aim
,,…,,ي Study lead recovery efficiency
Environmental safety .
The possibility of reuse the glass ( after recovery ) in industry such as foam glass .
method used in thisnnnnتتت