Is acid treatment of secondary aluminum waste products prior to storage and disposal a viable option?
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As the lead-free solders are used widely,more dross was formed during wave soldering,which lead to industrial waste. In this paper,oxidation action of liquid solders and production characteristic of the dross in wave soldering pot was introduced and some methods to reduce dross were enumerated. It introduces a high-efficiency wet separation technology for dross and its advantages and disadvantages.
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During various steps of the production of aluminum and its alloy, huge amount of dross floats on the liquid molten aluminum. Researchers found that this dross contains less amount of aluminum particles. Drossing is the formation of aluminum oxide and other oxides which accumulate on the melt surface. Recovery of aluminum from the dross is a challenging task. However, the conventional method that most of the foundries are following is very messy and also recovery rate is not optimum. In this paper, an attempt is made to accelerate the recovery rate by using the special purpose dross crusher. It is found that by using the dross crusher, the recovery rate is increased and also the method of handling molten dross is not so messy compared to the conventional method.
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Abstract On March 29, 1990, EPA promulgated the Toxicity Characteristic (TC) greatly expanding the amount of waste considered hazardous. The rule became effective six months later on September 25, 1990. Under the TC, wastes are evaluated using the Toxicity Characteristic Leaching Procedure (TCLP) to determine if the waste is hazardous. Regulatory levels were established for an additional 25 organic compounds expanding the TC constituents list to 39 substances. The regulatory level for vinyl chloride was set at 0.2 mg/1, a sufficiently high level to assure that most PVC wastes will not be hazardous because of VCM.
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For recycling aluminum dross, the characteristics of dross and its reutilization after processing should be considered. Aluminum dross was classified according to its size in this study. The dross larger than 300 {mu}m was directly re-melted to recover aluminum, and the smaller dross was leached and roasted to separate the existed salt and to oxidize the metals contained in the dross. As a result, amount of the dross used to be discarded after processing could be reduced. Also, the chemical compositions of a domestic aluminum dross and the changes in compositions during processing were investigated, and found that most metallic aluminum in the dross was changed into aluminum oxide through the roasting. The processed dross would be utilized for materials such as alumina, alumina cement or tiles. (author). 7 refs., 7 tabs., 1 fig.
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Abstract Municipal solid waste landfill leachate was sampled over from a landfill receiving varying amounts of municipal solid waste. The investigation aimed to provide information on expected leachate changes in the short term, either after closure of an active landfill, or after a strong decline in the amount of waste deposited at smaller landfills. It was found that during a two year period following a sudden decline in the amount of waste deposited, the levels of various chemical and physical parameters all dropped sharply. The reasons for the decline in discharge levels are thought to be aerobic decomposition taking place in the municipal solid waste just after landfilling, and thus the decline in the impact of this process when there were less fresh waste masses available, and formation of preferential flow paths for the leachate as the municipal solid waste stabilized in the landfill.
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To evaluate the effects of leachate recirculation, bench scale reactors which simulate landfill treatment of municipal solid waste were used. Different volumes of leachates from the reactors were recycled, the leachate-related variables such as COD, pH, NH3-N and VFA were analyzed, and landfill gas collected, metered and analyzed for contents of methane and CO2.
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Leachate from active municipal solid waste landfills can be a major source of contamination to groundwater and surface water. Therefore, the present investigation was carried out to assess the quality of municipal solid waste leachate samples. Ten leachate samples were collected from different locations have significant value of COD and BOD 1213 mg/L and 542 mg/L in sample respectively.
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A study has been carried out on the dross formation in continuous galvanizing in relation to the aluminiumcontent in the bath.Iron and aluminium concentrations in drosses formed in conventional galvanizing lines are determined.In the laboratory, Zn alloys containing 0.22% Pb, 0.13-4.60% Al and 0.066-0.24% Fe are molten ingraphite crucibles and held at 465°C for 40hrs before cooling. Using the sectioned ingots, spectroscopic analysisof the portions free from dross and quantitative microscopy analysis of dross compounds are performed:On the basis of these results, the amount of dross and that of aluminium consumed in the dross formationreaction in conventional processes are estimated. Conclusions derived are as follows:Drosses contain two compounds, namely δ and Fe2Al5.When the aluminium content in the bath is in the range of 0.09-0.14%, δ and Fe2Al5 can coexist. Inthis case the higher the aluminium content, the lower the fraction of δ-compound. When the aluminiumcontent is higher than 0.15% the δ-compound can not be found.The amount of the bottom dross is estimated to decrease rapidly with increasing the aluminium contentin the bath up to 0.14% and becomes negligible above 0.15% Al. The amount of the top dross, however, increasesrapidly with increasing the aluminium content up to 0.14% and decreases gradually above 0.15% Al.The amount of aluminium consumed in the dross formation reaction is estimated proportional to the amount of iron dissolved from sheets.
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