Sodium leaching

Industrial wastes and their effluents containing dyes and heavy metals are a tremendous threat to the environment, and to treat these toxic waste streams, effective and environmentally benign methods are needed.

12p vihermione 06-01-2023 5 2   Download

A highly dispersible and magnetically recoverable Cu-PEI@Fe 3 O4 MNPs catalyst was prepared and successfully applied in one-pot three-component coupling of terminal alkynes, sodium azide, and alkyl bromides/chlorides in water to give 1,4-disubstituted 1,2,3-triazoles with good to excellent yields. The catalyst was fully characterized with FT-IR, TGA, TEM, SEM, VSM, EDX, cyclic voltammetry, and ICP-AES spectroscopic techniques.

45p langthannam 29-12-2021 9 0   Download

The precipitation was done using sodium metabisulfite (Na₂S₂O₅). The elements in output residue obtained from acid leaching were identified using ICP-OES. Concentration of silver was found to be highest with the value of 64.40 mg/l among all the other elements present. Similarly, in header pins residue the concentration of silver was found to be 14.18 mg/l and copper 7.68 mg/l. The silver present in the IC chip ash was found to be 13.99 mg/l and the concentration of copper was 7.77 mg/l.

7p cleopatrahuynh 01-06-2020 7 0   Download

Two techniques are used for leaching uranium ores - acid leaching using mainly sulfuric acid and alkaline (using a mixture of sodium carbonate and bicarbonate). Alkaline leaching is particulary advantageous in the treastment of the ores with high content of carbonate minerals, since these minerals are not attacked by carbonate solutions. The effect of oxidants, grind size, carbonate concentration and leaching time on the efficiency of uranium recovery from the ores containing 3.5% of carbonate was investigated.

4p uocvong04 24-09-2015 35 2   Download