•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
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 …
Afterwards, other valuable metals enriched in the dust can be gradually …
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 ...
Different from the rotary hearth furnace process, Primus process is …
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 ...
The environment is seriously polluted due to improper and inefficient recycling of waste nickel−cadmium (Ni−Cd) batteries in China. The aim of this work is aimed to seek an environmentally friendly recycling process for resolving the negative impacts on environmental and human health resulting from waste Ni−Cd batteries. This …
The main secondary sources of the metals are sludge and tailings from the processing of some non-ferrous metals (such as Zn, Pb, and Cu), remelted Zn/Pb ingots or pigs, dust from EAF, Waelz slags and brass smelting, dross/waste from hot-dip galvanizing, spent batteries, EoL automobile shredder scrap, rayon industry sludge, cathodic tubes …
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 …
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 …
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 ...
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; …
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 …
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 …
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 ...
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 ...
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 …
The global shortage of zinc mines makes the extraction of zinc from zinc-containing wastes a hot research topic. Most kinds of steel mill dust (SMD) cannot be directly returned to the ironmaking and steelmaking processes due to their zinc content. A large amount of SMD produced during steelmaking has become a major challenge for …
Because of our processes, our wastewater treatment sludge contains …
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.
The main secondary sources of the metals are sludge and tailings from …
The motivation can be the valorization of the metal content. However, in …
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 .
During copper smelting, about 5∼10% by weight of the smelter feed was released as …
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 …
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 …
Abstract. During the steel scrap melting process in an electric arc furnaces, the generated dust may contain a significant amount of zinc. The content of zinc in case of melting galvanized steel scrap is variable and ranges from 15 to 40 wt%. This dust cannot be re-used for the steelmaking process.
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 ...
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 …
Electroplating sludge is a water purification waste containing multiple valuable metals which demand recycling with efficiency mostly associated with its thermal behavior. ... dust into zinc ...