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NK-1 and MG withdraw gold from wastewater containing trace amounts of gold
First, NK-1 activated carbon
Nankai University has studied an NK-1 activated carbon that can extract gold from waste water containing trace amounts of gold.
The NK-1 activated carbon can effectively extract gold from wastewater by static and dynamic tests (Au concentration is about 0.05×10 -4 %). The adsorption rate is 97.1%.
When NK-1 activated carbon was loaded with gold, the adsorbent was soaked in 1% NaCN and 5% NaOH mixed solution for 4 h, and then rinsed with 2 to 3 bed volumes of acetone. The rinsing efficiency was 97.2% to 97.7%.
This new type of adsorbent has broad prospects.
Second, MG polymer flocculation
In hydrometallurgical hydrometallurgy, gold is present in the leaching solution of HAuCl 4 , in order to solve the gold recovery of AuCl 4 - concentration at 5μg/ml, the Polymer Research Institute of Sun Yat-sen University proposed to recover the gold in the high-frequency flocculation system. gold. The MG cationic polymer, and sodium tripolyphosphate and sodium thiosulfate effect of the ligands on the gold formulated flocculation system, their recovery rate of 90% to 95%, flocculation and sedimentation can be obtained by burning gold . The suitable conditions for the recovery of gold and the flocculation mechanism of MG/Na 5 P 3 O 10 were studied.