摘要:
Methods of removing one or more oxyanions from an aqueous fluid can comprise increasing the pH of an aqueous fluid containing one or more oxyanions and contacting the aqueous fluid with aluminum metal.
摘要:
Aluminum is recovered from organic waste paper and packaging material containing aluminum foil by heating the waste material in a kiln or other such device to decompose the organic constituents in the waste material, preferably by pyrolysis, producing hot gaseous by-products with a carbonaceous ash residue containing aluminum. The ash residue is contacted with an aqueous solution of sulfuric acid under conditions which cause the aluminum to react with the sulfuric acid to produce aluminum sulfate. Preferably, the ash/acid contacting is carried out with a relatively dilute sulfuric acid solution and at an elevated temperature in the range of from about 80.degree. C. to about 100.degree. C. to produce Al.sub.2 (SO.sub.4).sub.3.18H.sub.2 O as the reaction product.
摘要翻译:从有机废纸和含有铝箔的包装材料中回收铝,通过在窑炉或其它这样的装置中加热废料来分解废料中的有机成分,优选通过热解,产生具有碳质灰渣的热气态副产物 含铝。 在使铝与硫酸反应生成硫酸铝的条件下,灰渣与硫酸水溶液接触。 优选地,灰分/酸接触用相对稀的硫酸溶液进行,并且在约80℃至约100℃的升高温度下进行,以产生作为反应产物的Al 2(SO 4)3.18H 2 O 。
摘要:
The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a temperature at which the calcium sulfate is retained in said composition during sintering and for a time sufficient to quantitatively convert the aluminum in said fly ash into an acid-leachable form.
摘要:
A method for the processing of potassium containing materials comprises: (i) Separation of a potassium containing mineral from gangue minerals; (ii) Acid leaching whereby substantially all potassium, iron, aluminum and magnesium is solubilized and mixed potassium/iron double salt formed; (iii) Selectively crystallizing the mixed potassium/iron double salt formed in the leach step (ii); (iv) Second separation to separate the mixed potassium/iron double salt formed in step (iii); (v) Thermal decomposition to produce an iron oxide, a potassium salt and one or more phosphates; (vi) Leaching the product of the thermal decomposition; (vii) Third separation to separate the iron oxide and phosphate from the potassium salt; (viii) Recovering the potassium salt by crystallization; (ix) Separating the iron oxide and phosphate of step (vii) by leaching and subsequent solid liquid separation; and (x) Precipitating phosphate from liquor produced in step (ix) through the addition of a base.
摘要:
A method for the processing of potassium containing materials comprises: (i) Separation of a potassium containing mineral from gangue minerals; (ii) Acid leaching whereby substantially all potassium, iron, aluminium and magnesium is solubilised and mixed potassium/iron double salt formed; (iii) Selectively crystallising the mixed potassium/iron double salt formed in the leach step (ii); (iv) Second separation to separate the mixed potassium/iron double salt formed in step (iii); (v) Thermal decomposition to produce an iron oxide, a potassium salt and one or more phosphates; (vi) Leaching the product of the thermal decomposition; (vii) Third separation to separate the iron oxide and phosphate from the potassium salt; (viii) Recovering the potassium salt by crystallisation; (ix) Separating the iron oxide and phosphate of step (vii) by leaching and subsequent solid liquid separation; and (x) Precipitating phosphate from liquor produced in step (ix) through the addition of a base.
摘要:
An improved process for preparing an enhanced antiperspirant active polymeric aluminum compound having the empirical formula:Al.sub.2 (OH).sub.6-a X.sub.a (I)wherein X is Cl, Br, F, I, SO.sub.4 and NO.sub.2, a is about 1.0 to about 4, which is further characterized by (a) a Size Exclusion Chromatograph, (b) a Band III percent aluminum value of at least 40 percent, and preferably (c) a Band I percent aluminum value of not greater than 5 percent, and compositions thereof.
摘要:
There is disclosed a method for the elimination of the chief impurities in aluminum dross tailings. The method can be used as a pretreatment in the manufacture of aluminum sulfate from aluminum dross tailings in a continuous flow reaction zone in which the dross tailings prior to reaction with sulfuric acid are pretreated to reduce the more objectionable contaminants contained therein to acceptable levels. The most objectionable contaminant in the dross tailings is aluminum metal which, in the invention, is oxidized with water or steam at elevated temperatures. The dross tailings, which are chiefly particles of aluminum oxide, are suspended in an aqueous slurry and the slurry is heated to a temperature from 185.degree.-225.degree. F. and maintained under liquification pressures and sufficient agitation to insure particle-to-particle attrition that removes an aluminum hydroxide coating which would otherwise inhibit the reaction.
摘要:
Methods of removing one or more oxyanions from an aqueous fluid can comprise increasing the pH of an aqueous fluid containing one or more oxyanions and contacting the aqueous fluid with aluminum metal.
摘要:
There is disclosed a process for manufacturing high purity aluminum sulfate by reacting aluminum containing metal impurities with sulfuric acid in the presence of liquid mercury. During the reaction period, the metallic impurities in the aluminum are absorbed into the mercury and the aluminum sulfate produced. The impurity containing mercury is thereafter separated from the aluminum sulfate product. If further desired the impurities may be separated from the mercury and the thus purified mercury is, in a preferred embodiment, recycled to the reaction zone.