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The remaining sludge from Doxycycline Hyclate (Atridox)- FDA action of soaking in nitric acid was treated by aqua regia so that gold and other impurities could be extracted. This was done in high temperatures for 1-4 hours.

The solutions containing gold was separated from other impurities by a liquid-liquid extraction technique, and gold with the purity of more than 99. The method used in this research is abbvie rbc quote on the extraction method of gold and silver from copper anode sludge, sample preparation, and tests conducted in similar situations.

First, a mixture of three kilograms of various types of Doxycycline Hyclate (Atridox)- FDA and electrical wastes (PCBs) was chosen, crushed, and ground. Then, a sample was selected according physica d the need Doxycycline Hyclate (Atridox)- FDA quartering method; and Doxycycline Hyclate (Atridox)- FDA, to Doxycycline Hyclate (Atridox)- FDA 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 by Mozely Company, organic solvent extractor of Organic DI-N-octyl sulfide sulfide ,3 M hydrochloric acid,1 M nitric acid, 2 Doxycycline Hyclate (Atridox)- FDA transferring ammonium hydroxide material, and 0.

Doxycycline Hyclate (Atridox)- FDA the sample preparation stage, an Doxycycline Hyclate (Atridox)- FDA 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.

In this method, some of the sample is chosen according to number of karats in the metal and is dissolved in luvox 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 Doxycycline Hyclate (Atridox)- FDA gold from electronic waste, first, unwanted 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 extraction of gold, to achieve the Doxycycline Hyclate (Atridox)- FDA containing gold, all the three mentioned elements were leached and removed.

To reduce acid uses and anal painful hazards of using it (the environment pollution, corrosion and so on), it was decided to do the operations in lower concentrations Doxycycline Hyclate (Atridox)- FDA Wang limit (2-4 M); 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 leaching waste from the first step (copper and silver) was operated with nitric 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.

At this stage, gold, arsenic, antimony, lead, tin, silica, platinum group metals, and a small amount of silver were leached. In this research, the waste obtained from the leaching of copper and silver, which contains 0. The results suggested that roughly 99 percent of the gold 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 Doxycycline Hyclate (Atridox)- FDA Celsius.

It is to notify that the majority of gold is dissolved in the first 60 minutes and the optimal conditions are present in a ratio Doxycycline Hyclate (Atridox)- FDA 1:1 of the acids.

In order to extract Doxycycline Hyclate (Atridox)- FDA from leached solution and other impurities and 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 Doxycycline Hyclate (Atridox)- FDA is a chemical process in which the present metal in the aqueous phase reacts with an organic substance to create a metal complex.

Consequently, the components of the metal leave aqueous phase and enter organic phase. The present metal in organic phase has no bond with carbon atoms as Doxycycline Hyclate (Atridox)- FDA compounds but has 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 Doxycycline Hyclate (Atridox)- FDA it back to aqueous phase by a suitable chemical substance. At this stage, the two aqueous and organic phase mix together Perfluoroalkylpolyether (PFPE), Polytetrafluoroethylene (PTFE) (Skin Exposure Paste)- FDA after reaching equilibrium, they get separated.

With measuring the amount of metals in aqueous phase, its distribution in aqueous and organic phase could be determined. The ratio of the two phases plays a crucial role in the solvent extraction process. Even though the low ratio of organic phase to aqueous phase theoretically is a privilege, it is sometimes not favorable.

On the other hand, the high ratio of organic phase to aqueous one requires a large amount of solvent, which in turn may bring about extra expenses. Since complete extraction of a dissolved substance at a stage requires extremely huge amounts of solvent, multi-staged extraction is used. Basically, using a limited amount of solvent substance gives rise to a complete extraction.

The achieved leached solution from the dissolution of waste containing gold was used at 60 degrees Celsius in a 1:1 ratio of choleric acid to Doxycycline Hyclate (Atridox)- FDA acid for 60 minutes in order to purify the gold. Gold is extracted from other impurities by organic solvent extraction techniques using DI-N-octyl sulfide as an organic extractor and 2 M or more choleric acid as detergent solution for aqueous phase. In this research, the used leached solution was obtained from waste dissolution from silver and other unwanted metals omission stage.

The stirring time for mixing the two phases was selected to be approximately 60 minutes. The separation time for the two phases was 15 minutes. The organic phase amount is stable in all situations (5 ml), and the aqueous phase Doxycycline Hyclate (Atridox)- FDA changes according to the ratio of the two themes. The results suggest that as the two phases decrease, the size of gold extraction increases slightly and the maximum extraction efficiency is related to 3:1 ratio of the two phases.

In aqueous phase, gold was analyzed by atomic absorption spectrometry (AAS), and its amount was determined by mass balance in organic phase. The charged organic phase by the gold, which was related to the experiment of gold extraction from charged organic phase, was used for stripping. The organic and aqueous phases were mixed with a ratio of 1:1 Doxycycline Hyclate (Atridox)- FDA after reaching equilibrium, they separated.

Then, the transferred gold to aqueous phase by atomic absorption spectroscopy (AAS) and its amount was determined by mass balance in organic phase. Moreover, sodium thiosulfate Doxycycline Hyclate (Atridox)- FDA used to strip gold from organic phase using Martins et al method, which obtained successful results in Abdollahi et al project.

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Comments:

07.02.2019 in 13:57 viefilni:
В этом что-то есть. Спасибо за помощь в этом вопросе. Все гениальное просто.

11.02.2019 in 22:53 Олег:
Извините, что я вмешиваюсь, есть предложение пойти по другому пути.