recycling of sludge dust containing valuable metals nickel zinc
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- recycling of sludge dust containing valuable metals nickel zinc
Commercial reprocessing of metals such as Zinc from EAF dust requires that EAF dust contain a minimum of 15 percent Zinc [84], and sometimes is only feasible for plants with a large capacity ...
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This paper concerns the development of an environment-friendly hydrometallurgical flowsheet dedicated to the recovery of zinc and nickel from a waste residue collected from an Iranian zinc plant. In particular, valuable metals from Ni-Cd cake waste generated at this plant were recovered by a simple hydrometallurgical process …
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Abstract. Zinc containing wastes/secondaries viz. zinc ash, dross, flue dusts, sludge, residue etc. are generated in various chemical and metallurgical industries. The materials contain different level of impurities depending on the source. The hydrometallurgical processing is effective and flexible for treating such materials as it can …
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Besides metals such as copper, lead, and zinc, arsenic also enters the dust, and untreated dust can easily cause environmental pollution and safety accidents through rainwater washing, leaching, and microorganisms (El Safty et al., 2014; Lilis et al., 1984).Depending on the minerals, smelting dust may contain rare metals such as indium, germanium, …
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4.2. Treatment of municipal sewage sludge by chlorination roasting. The sewage sludge (SS) produced by the sewage treatment plant is regarded as the second largest phosphorus resource in the world, because it contains the highest content of 37 g P/kg SS [90].Sewage sludge is rich in organic pollutants (PCBs, AOX), pathogens and …
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This paper proposes an innovative carbothermal reduction roasting low-carbon redox refining process for recovering valuable metals, including copper, zinc, nickel, tin and lead, from electroplating sludge. First, the valuable metals are volatilized into the flue gas by carbothermal reduction roasting. At a reduction temperature of 1473 …
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In such great volume, several valuable metals have been left unrecovered. …
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Stainless steel pickling sludge (SSPS), generated from the lime neutralization process of spent pickling liquor, is classified as a hazardous waste consisting of abundant metals like Fe, Cr and Ni, and other elements like F, S and Na, etc. Rather than a common disposal in landfill, recovering these metals and other valuable components …
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Abstract. As contributions of non-ferrous smelters to metal resource circulation, ores and secondary raw materials, such as scrap and waste, are treated to recover base metals such as copper, lead, and zinc, as well as other precious and minor metals. One crucial factor that makes this metal recovery possible is the creation of an …
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A study by Best and Pickles examined the feasibility of recovering metals of values from EAF dust containing 24.8 wt% zinc using a 24 kVA AC plasma arc furnace under CO atmosphere between 1000 and 1400 °C with reaction ratio of 1–8 g L −1 (dust feeding rate to CO flow rate) and dust feeding rate of 50–150 g min −1 (Best and Pickles ...
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Further, the sludge is characterized by its highly inorganic nature, containing significant amounts of metals, such as iron, chromium, nickel, and zinc, and other pollutants, such as acid, BTX, oil and grease, etc., as stated before. These pollutants are present due to the industrial processes involved in steel production.
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Research for the recycling of lithium-ion batteries (LIBs) started about 15 years ago. In recent years, several processes have been realized in small-scale industrial plants in Europe, which can be classified into two major process routes. The first one combines pyrometallurgy with subsequent hydrometallurgy, while the second one combines …
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In recent years, the treatments of blast furnace dust such as returning to blast furnace sintering, using as flocculants and cement raw materials and adsorbents, recycling carbon and iron as well as recovering rare and high-valued metals were studied [8, 13, 14].Many process technologies have been more mature in enterprise application; …
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The recovery of valuable metals from electronic waste has attracted a great deal of attention recently in the field of recycling. The recovery process for metal resources present within flue dust ...
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RESULTS: It has been established that zinc oxide is mainly in the bound state in the composition of the franklinite phase (Zn,Mn,Fe) (Fe,Mn)2O4. The processes of solid-phase reduction of EAF dust ...
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1. Introduction. With the increasing use of mobile and cordless electronics, the disposal of spent batteries has also risen considerably. Batteries contain toxic metals such as Li, Co, Ni, Cd, Mn, Zn, and organic components (e.g. ethylene carbonate, dimethyl carbonate, diethyl carbonate) (Bal, Ghosh, and Das Citation 2019; Li et al. Citation 2010; …
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Pyrometallurgy. Pyrometallurgy is a method of obtaining metal alloys by processing ores or solid wastes containing valuable metals with a series of physicochemical changes under high-temperature conditions so that metals in them are separated from gangue or other impurities. From: Chemical Engineering Journal, 2023.
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However, metals such as iron, nickel and chromium, in the form of oxides and/or hydroxides, as well as calcium fluoride in the sludge, are of economic concern to stainless steel makers.
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1. Introduction. Currently, the main source of zinc metal is the traditional zinc resource—zinc sulfide ores. However, as the zinc consumption increases and the zinc sulfide ore grades deteriorate, the gap between supply and demand has become a major problem for the zinc industry [1,2].At the same time, large quantities of metallurgical slag …
به خواندن ادامه دهیدDepending on the raw fuel used for steel production, the dust and sludge often contain up to 20 or more valuable elements and compounds. Steel metallurgical dust contains Fe, C, Zn, Pb, K, and Na and is enriched with valuable and rare elements, such as I, In, Bi, Sn, Cd, Rb, Cs, Tl, Sb, and Sr (Vereš et al., 2011; Liu et al., 2020).These …
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Zn leach residues. 1. Introduction. Although most of the gold produced each year originates from primary gold ores or concentrates, a significant amount of gold is recovered as byproduct from the production of base metals (BMs) and from the recycling of scrap. From a gold world production of approximately 2600 metric tons in 2004, about …
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With the rapidly increasing industrial and agricultural development, a large amount of sludge has been produced from much water treatment. Sludge treatment has become one of the most important environmental issues. Resource utilization of sludge is one of the important efficient methods for solving this issue. Sludge-based activated carbon (SBAC) materials …
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Because of our processes, our wastewater treatment sludge contains …
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A large amount of dust is formed as one of the primary by-products during the blast furnace ironmaking process. Besides iron and carbon, it contains a variety of valuable metals such as zinc, lead, and indium widely applied in many industry fields. However, it is difficult to recycle and reutilize blast furnace dust (BFD) due to complex composition, …
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The presence of fluorite was high in the silicate phase, resulting in the accumulation of this compound mainly at the surface. The fluoride was immobilized by calcium, with the immobilization rates for fluorine, copper, zinc, and nickel reaching a level of 99.5%. A sludge addition did not cause any threats or side effects .
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•Red Mud –Can Contain 0.1 –1% Rare Earths •Asbestos •Produced Waters –New Efforts Within FE & EE •Municipal Solid Waste –1 ton/person/ per year –estimated 1- 17 wt.% metals •Municipal Sludge –Great Excitement in 2015, ES&T Paper Valuable Metals •E-Waste –Platinum Group Metals, Nickel, Lithium, Cobalt
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Mining is an important industry, accounting for 6.9% of global GDP. However, global development promotes accelerated demand, resulting in the accumulation of hazardous waste in land, sea, and air environments. It reached 7 billion tonnes of mine tailings generated yearly worldwide, and 19 billion solid tailings will be accumulated by …
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Pyrometallurgical copper smelting will produce a large amount of dust-containing flue gas, which forms acidic mud containing copper and selenium when it is washed. Such materials contain high amounts of copper, selenium, and a small amount of precious metals such as gold and silver. Copper and selenium mainly exist as …
به خواندن ادامه دهیدThe non- zinc sludge waste from the digester (pri- marily copper and nickel) is digested …
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In fact, e-waste is a reservoir of several precious metals with quantities of 40 to 50 times greater than natural reservoirs. Consequently, in these goods, precious metals that are worth roughly $21 billion are present. Electronic devices contain roughly 60 different elements that can be recovered (Thakur and Kumar, 2020).
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effective pickling sludge recycling technology using a smelting reduction furnace with two-stage tuy-eres.11 B.U.S Scan Dust AB focused on recovery of valuable metals contained in filter dust. In the new process, plasma was used as the heat source. The dust and gas were mixed and ejected into a furnace hearth through a specially …
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The non- zinc sludge waste from the digester (pri- marily copper and nickel) is digested with suffuric acid and filtered to produce a resi- due containing precious metals (e.g., gold, silver). The filtrate is then sent to the cop- per electrowinning system for …
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These dusts contain also valuable metals but extraction and recovery of valuables is difficult due their complex composition. Zinc is the most troublesome element in the dust and it hinders direct ...
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Metal oxides in the dust are selectively or non-selectively reduced to metals in high-temperature zones, where metals such as zinc and lead volatilize with the flue gas. Among the reduction processes, reduction in a rotary kiln is one of a few commercialized processes to treat the dusts at present, achieving high separation efficiencies for Zn ...
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Electric arc furnace (EAF) dust is an important secondary resource which contains multiple metallic elements, such as Zn, Pb, Fe, Cr and Cd. Recycling of EAF dust is not only favorable to increasing the economic potential of the dust by recovering these valuable metals, but also benefits solving disposal and environmental problems caused …
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In this work, for realizing waste recycling effectively, selective and multi-step leaching of valuable metals was investigated with scrap copper-smelting sludge as research object.
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The other ingredients of EAF dust are lead oxide, zinc chloride, heavy metal salts (e.g., PbCl 2) and alkaline metal chlorides [1,4,5,6,7]. Currently, the most popular technology for recycling dust from electric arc furnaces containing zinc and iron is the Waelz Process, where dust from EAFs is placed in a rotary kiln with a load of coke [8,9,10].
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The metal recovery is 91% for copper, 94.4% for nickel and 93.3% for cobalt. Leach residue is rich in precious metals such as gold, silver. Therefore, this method can be used as an effective way to recover precious metals. The use of a 30 kW DC plasma torch could effectively recover copper and other valuable metals (Mitrasinovic et al., 2011 ...
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