Process for recovering metallic lead from waste lead-contained glass by adopting mechanical activation reduction method
A technology of mechanical activation and reduction method, applied in the field of metal lead recovery, can solve the problems of complicated solid-liquid separation operation, difficult direct leaching of alkali solution, loss of equipment caustic soda, etc. , the effect of high leaching rate
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[0019] Example 1
[0020] Using waste cathode ray tube (CRT) cone glass as raw material, its lead content is 24.5wt%. Crush 50g of the glass raw material to 1-2mm, add it to the ball mill tank of the planetary ball mill, add 3.5g iron powder, and control the mass ratio of the raw material to the ball milling medium (stainless steel ball) to 1: 8, at 400 revolutions / min Ball mill for 120min under the condition of the speed of 90 minutes; then take out the glass powder after ball mill activation and add it to 1.0 L industrial caustic soda solution with a concentration of 3 mol / L, and leaching reaction for 90 minutes. The leaching rate of lead in glass is 94.8% filtered. The leaching solution can be directly recycled to the next leaching process after the metal lead is extracted by conventional electrodeposition, and the leaching residue can be used to prepare foam glass.
Example Embodiment
[0021] Example 2
[0022] Using waste fluorescent lamp stem glass as raw material, its lead content is 26.7wt%. Crush 100g of the glass raw material to 1-2mm, add it to the ball mill tank of the planetary ball mill, add 5g iron powder, and control the mass ratio of the raw material to the ball milling medium (zirconia balls) to 1:10 at 450 revolutions / min Ball mill for 120 minutes under the condition of the speed of 90 minutes; then take out the glass powder after ball mill activation and add it to 2.0 L industrial caustic soda solution with a concentration of 5 mol / L, and leaching reaction for 90 minutes. The leaching rate of lead in the glass was 93.7%. After filtering, the leaching solution can be directly recycled to the next leaching process after the metal lead is extracted by conventional electrodeposition. The leaching residue can be used to prepare foam glass.
Example Embodiment
[0023] Example 3
[0024] Using waste crystal glass as raw material, its lead content is 21.9wt%. Crush 100g of the glass material to 1-2mm, add it to the ball mill tank of the planetary ball mill, add 2.2g zinc powder, and control the mass ratio of raw material: activating medium (zirconia balls) to 1:10, at 500 / min Ball mill for 120 minutes under the condition of the speed of 90 minutes; then take out the glass powder after ball mill activation and add it to 2.0 L of industrial caustic soda solution with a concentration of 7 mol / L, and leaching reaction for 90 minutes. The leaching rate of lead in the glass is 91.5%. After filtering, the leaching solution can be directly recycled to the next leaching process after the metal lead is extracted by conventional electrodeposition. The leaching residue can be used to prepare foam glass.
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