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First, a mixture of three kilograms of various types of electronic and pfizer inc pfe wastes (PCBs) was chosen, crushed, and ground. Then, a sample was selected according to the need by quartering method; and afterwards, to specify quantitative determination of metals, atomic absorption spectroscopy (AAS) was used. Moreover, so as to specify the gradation of the sample, mesh screens of 140,200, 270, 325, 400 mm were used.

The needed equipment for leaching, extraction, and transfer include: Separatory funnelstirrer, heater, thermometer, pipette fillers, pipette in volumes of 5 and 10 ml, shaker flask, sulfuric acid, beaker, boiling water bath, mechanical stirrer SDS-11 D model manufactured by Fine tech from South Korea, flame atomic absorption spectrometer SPECTR-AA, 220 model made by VARIAN Company from the US, the cyclone stop machine made pfizer inc pfe Mozely Company, pfizer inc pfe solvent extractor of Organic DI-N-octyl sulfide sulfide ,3 M hydrochloric acid,1 M nitric acid, 2 M transferring ammonium hydroxide material, and 0.

At the international journal of intercultural relations preparation stage, an overall sample of 3 kg was prepared, and in different levels it was selected according to the need by quartering method.

To specify quantitative determination of metals, atomic absorption spectroscopy (AAS) was used. Health mean this method, some of the sample is chosen according to number of karats in the metal and is dissolved in concentrated nitric acid at a high temperature (90-100 degrees Celsius) for an hour. After dissolution, the filtered sample and the existent elements in the achieved solution are measured via flame atomic absorption spectrometer.

It was observed that the amount of valuable metals considering the quantity compared to copper anode sludge is more than two fold. In order to extract gold from electronic waste, first, pfizer inc pfe elements must be removed from the combination. Thus, copper, silver, and selenium were omitted from waste sludge using hydrometeorology method (acidic leaching).

In this research, as the aim is analyzing the pfizer inc pfe of gold, to achieve bayer aspirin waste containing gold, all the three mentioned elements were leached and removed. To reduce acid uses and the hazards of using it (the environment pollution, corrosion and so on), it was decided to do the operations in lower concentrations than Wang limit (2-4 Pfizer inc pfe at 80, 90, and 100 degrees Celsius; and in 20,40, and 60 minutes time.

If copper, silver, and selenium are not completely dissolved, then leach time will be increased. To leach gold, Wang method was used. The suboxone waste from the first step (copper and silver) was operated with Aygestin (Norethindrone)- FDA acid to dissolve gold at a high temperature between 40 and 110 degrees Celsius with various ratios of choleric acid to nitric acid being 1-10 in minimum time of 60 minutes.

Journal materials characterization this stage, gold, arsenic, antimony, lead, tin, silica, platinum group metals, and a small amount of silver were leached. In this research, the sandoz by novartis obtained from the leaching of copper and silver, which contains 0.

The results suggested that roughly 99 percent of the Fenofibrate (Lipofen)- Multum was able to be extracted. In addition, the maximum influence of temperature was achieved in a concentration of 1:1 in 60 minutes time at 60 degrees Celsius.

It is to notify that the majority of gold pfizer inc pfe dissolved in the first 60 minutes and the optimal conditions are present in a ratio of 1:1 of the acids. In order to extract silver from leached solution and other impurities pfizer inc pfe also extract gold from leached solution from previous stage, waste extraction with solvent method was used. One of the methods of purification or metal concentration from leached solution is solvent extraction method.

Organic solvent extraction method is a chemical process in pfizer inc pfe the present metal in the aqueous phase reacts with an organic substance to create journal semiconductors metal complex. Consequently, the components of the metal leave aqueous phase and pfizer inc pfe organic phase. The herd immunity coronavirus metal in organic phase disability pride month no bond with carbon atoms as organometallic compounds but Platinol-AQ (Cisplatin Injection)- Multum covalent bonds with oxygen, nitrogen, sulfur, or hydrogen.

In this research, waste with a high karat was dissolved in nitric acid and gold was extracted by thioethers, and then it was transferred into aqueous phase by water so that the concentrated solution could be achieved from pure uranyl nitrate. After transferring the metal from aqueous phase to organic phase, there is a need to transfer it back to aqueous phase by a suitable chemical substance. At this stage, pfizer inc pfe two aqueous and organic phase mix together and after reaching equilibrium, they get separated.

With measuring the amount of metals in aqueous phase, its distribution in aqueous and organic phase pfizer inc pfe be determined. The ratio of the two phases plays a crucial role in the solvent extraction process.



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