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Recovery method of alumina by using sulphuric acid leaching method from molten incinerator slag of sewage sludge
Recovery method of alumina by using sulphuric acid leaching method from molten incinerator slag of sewage sludge
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机译：硫酸浸出法从污泥熔融焚烧炉渣中回收氧化铝的方法
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摘要
The present invention relates to a method for recovering alumina from the sewage sludge melt incineration slag by sulfuric acid leaching, the purpose of which is the waste of sewage sludge melt incineration slag containing Al 2 O 3 , SiO 2 , Fe 2 O 3 and CaO As one of resource recycling technologies, it provides a manufacturing method for recovering alumina by using an economical and efficient chemical acid leaching method.;The composition of the present invention is the leaching reaction of sewage sludge melt incineration slag composed of Al 2 O 3 , SiO 2 , Fe 2 O 3 , and Ca with an aqueous sulfuric acid solution to prepare an aqueous solution of sulfates, and then precipitated using an alcohol precipitation agent. After that, the filtration step of separating the insoluble cake component composed of the filtrate and silica, and purifying again with a mixture of alcohol, water and ethanol, drying the purified precipitate, and calcining the dried precipitate in an air atmosphere It is characterized by recovering the alumina salt through a step.
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机译：本发明涉及一种利用硫酸浸出法从污水污泥焚烧炉渣中回收氧化铝的方法，其目的是浪费含Al 2 O 3的污水污泥焚烧炉渣。 ，SiO 2 ，Fe 2 O 3 和CaO作为资源回收技术之一，它提供了一种回收氧化铝的制造方法。本发明的组合物是由Al 2 O 3 ，SiO组成的污泥熔融焚烧炉渣的浸出反应。 2 ，Fe 2 O 3 和Ca与硫酸水溶液制备硫酸盐水溶液，然后用醇沉淀沉淀剂。此后，进行过滤步骤，将由滤液和二氧化硅组成的不溶性饼状成分分离，并再次用醇，水和乙醇的混合物进行纯化，将纯化的沉淀物干燥，并将干燥的沉淀物在空气中煅烧，其特征在于通过一个步骤回收氧化铝盐。
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