Pub Date : 1987-01-01DOI: 10.1016/0361-3658(87)90060-9
N.M Stubina, J.M Toguri
In this investigation, it was shown that magnesium can be removed from aluminum melts using dichlordifluoromethane (CCI2F2). As long as the magnesium content of the melt was greater than 0.5 mass %, the rate of magnesium loss from the bath was a constant, or:
For an 850 g melt containing 5 mass % Mg and a gas composition of 10% CCl2F2 - 90% N2, the slopes of the various curves (k) ranged from 4.6 × 10−3 %Mg/min at 685°C to 3.1 × 10−2 %Mg/min at 810°C.
The thermodynamic characteristics of the magnesium removal (‘demagging’) operation were modelled using the F∗A∗C∗T∗ computer package. Various dross samples generated during the experiments were analyzed by X-ray diffraction in order to confirm the computer predictions.
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Pub Date : 1987-01-01DOI: 10.1016/0361-3658(87)90004-X
Dou Zhiming, Song Qingshuang, Li Xiwen, Lin Maosen, Lan Weijun, Zhao Yanchang
A pilot plant procedure to treat alloy scrap containing 30–60% nickel, 0.5–15% chromium and < 0.1% cobalt to recover nickel and other metals is described. Alloy scrap was melted in an electric furnace and cast into anodes for electrolysis in a diaphragm cell operating with a recycled chloride electrolyte. Effective electrolytic conditions were 200–250 A m−2, 60–65°C, a 4.0–4.5 pH catholyte solution containing 60–65 g l−1 nickel, and a 2.0–3.0 pH anolyte solution. Purified catholyte was prepared by removing chromium hydroxide which was precipitated by adding Na2CO3 or NiCO3 solution to pH 4.2–4.6. Iron was eliminated with chlorine gas by vigorously aerating the solution to oxidize the iron and precipitate ferric hydroxide at pH 4.8–5.0. Cobaltic hydroxide was also precipitated along with iron. Activated carbon and anion exchange resin were used to remove trace amounts of copper, chromium, zinc and organic matter. After pH adjustment, the remaining purified solution was used for electrolysis in the cathode compartment where nickel was recovered. Some problems in the melting step and the control of technical conditions are discussed.
处理含30-60%镍、0.5-15%铬和<的合金废料的试验工厂程序;描述了0.1%钴回收镍和其他金属。合金废料在电炉中熔化，然后铸造成阳极，在隔膜电池中用回收的氯化物电解液电解。有效电解条件为:200-250 μ m−2,60-65℃，pH为4.0-4.5的含60-65 g l−1镍的阴极电解质溶液，pH为2.0-3.0的阳极电解质溶液。将Na2CO3或NiCO3溶液加入pH 4.2 ~ 4.6，除去沉淀的氢氧化铬，制备纯化的阴极电解质。在pH为4.8 ~ 5.0的条件下，用氯气对溶液进行强曝气，使铁氧化，生成氢氧化铁。氢氧化钴也随铁析出。使用活性炭和阴离子交换树脂去除微量的铜、铬、锌和有机物。调整pH后，剩余的纯化溶液在阴极室中电解，回收镍。讨论了熔炼过程中存在的问题及工艺条件的控制。
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Pub Date : 1987-01-01DOI: 10.1016/0361-3658(87)90050-6
Akio Hashimoto, Shunji Iwamura, Sukehiro Gotoh
{"title":"Design and construction of a large refuse silo for maximum heat recovery by incineration","authors":"Akio Hashimoto, Shunji Iwamura, Sukehiro Gotoh","doi":"10.1016/0361-3658(87)90050-6","DOIUrl":"10.1016/0361-3658(87)90050-6","url":null,"abstract":"","PeriodicalId":100327,"journal":{"name":"Conservation & Recycling","volume":"10 4","pages":"Pages 209-216"},"PeriodicalIF":0.0,"publicationDate":"1987-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0361-3658(87)90050-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91075680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-01-01DOI: 10.1016/0361-3658(87)90007-5
{"title":"4589203 Method and apparatus for the cryogenic stripping of electric cables","authors":"","doi":"10.1016/0361-3658(87)90007-5","DOIUrl":"https://doi.org/10.1016/0361-3658(87)90007-5","url":null,"abstract":"","PeriodicalId":100327,"journal":{"name":"Conservation & Recycling","volume":"10 1","pages":"Page 39"},"PeriodicalIF":0.0,"publicationDate":"1987-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0361-3658(87)90007-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136452954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-01-01DOI: 10.1016/0361-3658(87)90012-9
{"title":"4596603 Method for the selective recovery of constituent materials from insulate-delectrical-cable wastes","authors":"","doi":"10.1016/0361-3658(87)90012-9","DOIUrl":"https://doi.org/10.1016/0361-3658(87)90012-9","url":null,"abstract":"","PeriodicalId":100327,"journal":{"name":"Conservation & Recycling","volume":"10 1","pages":"Page 40"},"PeriodicalIF":0.0,"publicationDate":"1987-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0361-3658(87)90012-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136455515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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