+ 86 13953560679
high grade primary metal resources, which urges the metal producing industries to look for secondary alternative sources for metal extraction (Anjum et al. 2012). Metal bearing wastes from different industries can be such alternative resources for the recovery of metals, as some of the wastes still contain signicant levels of valuable metals.
The recycling of printed circuit boards from obsolete computers is, at present, a fairly new activity in Brazil, although opportunities are available for expansion in this area. For instance, gold, silver, tin, and copper, among other metals, can be recovered by means of the hydrometallurgical treatment of printed circuit boards (PCB) from
Recovery of Metal in Lead Smelter Matte by Chlorine Oxygen Leaching. Metal values were recovered from a lead smelter matte using a chlorine oxygen process to solubilize the Cu, Ni, Zn, Co, and Cd and convert the lead to a chloride. A subsequent hot brine leach was used to
These metals can be recovered from E waste at cheaper cost than from the usual ores. Techniques like pyrometallurgy, hydrometallurgy, and biohydrometallurgy are used to recover precious metals like copper, silver and gold.
Depending on the desired metal, and its original matrix, different solvents can be used in the leaching process, these solvents are known as lixiviants. For those of you unfamiliar to the term, lixiviate means to leach, or dissolve out.
The non magnetic portions are reduced to a powder and the base and precious metals are recovered by sequential electrochemical and leaching processes. The base metals and precious metals are recovered in elemental form without consuming large amounts
The metals can be recovered by the microorganisms by two processes. 1. Bioleaching or microbial leaching This broadly involves the extraction or solubilization of
This BREF document covers fourteen different metals, including gold, that are mined and/or processed in the European Union (EU 15), the acceding countries, the candidate countries and Turkey, Heap leaching techniques are briefly addressed in this version of the BREF document but not sufficiently described.
A method of recycling rare earth metals included in a waste material, wherein the method comprises acidic leaching of the waste material using a non oxidizing acid for solubilizing at least a part of metals included in the waste material while maintaining at least a part of non metallic materials of the waste material in solid form, separating the remaining solid components of the leached
metals recovery and removal of metals having no current value (Figure1). The leach solution percolates to the bottom of the leach pads and is either re circulated through the heap or fed to metals recovery. The acidity of the leach solution (pH 2.02.5) is controlled by sulphuric acid, and leaching of metals is
A leaching process for the recovery of cobalt and lithium from spent lithium ion batteries (LIB) is developed in this work. Three different organic acids, namely citric acid, malic acid and aspartic acid, are used as leaching reagents in the presence of hydrogen peroxide.
Leaching platinum group metals with cyanide, however, is a new concept and process option. The research available is very much limited to the recovery of platinum group metals from recycled automotive catalyst using cyanide 8 14 .
Remote, low grade deposits of platinum group metals (PGMs) can be economically recovered using novel direct leaching approaches, doing away with the need for traditional, expensive smelting
most common leaching agent for precious metals, but not all of the PGMs can be dissolved with it. After the extraction step, the pregnant solution is separated and can be treated by different principles. One option is direct cementation with a less noble metal. An alternative is solvent
zinc recovery for each leach residue by use of sulphuric acid (H 2SO 4) and to compare the TLR and the ILR. Ini tially, detailed chemical, mineralogical and thermal anal yses of these different leach residues were carried out. In order to investigate the effect of acid concentration and reaction duration on zinc recovery, leaching experiments
Moreover, in chloride leaching, the formation of chloride complexes with different valuable metals makes it easier to achieve a comprehensive recovery of metals in tailings. Many experimental investigations have been carried out on silver recovery from silver bearing wastes through chloride leaching (Yazici and Deveci, 2015, Zhang et al., 2012). However, the recovery of silver from low grade tailings, especially
Leaching can be followed by conventional metal recovery methods like solvent extraction, precipitation, adsorption, ion exchange and electrowinning.
metals could be recovered from these ashes. This can be done through chemical leaching; researchers have determined that leaching of ashes should be carried out in acid solutions. It has been shown that metals leach most efficient at lower pH value but for some metals the release rate of metals are still as efficient at higher pH value.
different types of materials, especially lean and so far unusable resources, by which metal values can be recovered. Lastly, the process is carried out in close loop generating minimum effluents and thus is preferred as green technology.
In other words, metals bound in minerals are transformed into metal ions that are released into an aqueous solution, i.e. immobilized metals become mobilized. Extraction of metals from ores to aqueous solutions by means of chemicals. Leaching occurs naturally but may also be applied as a preparatory step for metal recovery.
Different leaching processes and the leaching of metals from various metal bearing solid wastes are discussed in detail below. 6.3.1 Hydrometallurgical Processes Hydrometallurgy is the extraction of metals from resources with the help of aqueous chemicals.
Some metals like gold and silver are extracted from their concentrated ores by leaching. They are dissolved in suitable reagents like acids or bases leaving behind insoluble impurities. The metal is recovered from the solution by displacement with some more electropositive metal such as zinc.
metal recovery except for Si metal. Figure 2. Comparison of a) H 2SO 4 and b) HCl as leaching reagent for recovery of precious metals at room temperature with different molarity ; 1 M, 3 M and 5 M. The effect of temperature in leaching process are carried out
Xinhai provides optimized solutions for your mine, one-stop service for mineral processing plant, include sample test, mine design, equipment manufacture, etc.
Address:No. 188, Xinhai Street, Fushan high-tech industrial development district, Yantai, Shandong, China
© 2017 Shandong Xinhai Mining Technology & Equipment Inc.