Mixing heating acid dissolving method and device for fly ash slurry
A hybrid, fly ash technology, applied in the direction of energy input, alumina/hydroxide, etc.
Inactive Publication Date: 2010-10-20
CHINA SHENHUA ENERGY CO LTD +1
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Problems solved by technology
Aiming at the dissolution process of producing alumina by fly ash hydrochloric acid method, there is no such process technology at home and abroad at present, and the present invention fills up the blank in this field
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[0021] see figure 1 , which shows a preferred embodiment of a fly ash slurry mixed heating acid dissolution device of the present invention, including a casing preheater, which includes a first-stage casing preheater connected end to end 1 and II-level casing preheater 2; the fly ash slurry mixed heating acid stripping device of the present invention also includes a reaction kettle and a flash evaporator, wherein the reaction kettle includes a preheater with the II-level casing preheater The 1# reactor 3 that heater 2 links to each other, and the 2# reactor 4 that links to each other with described 1# reactor 3, the 3# reactor 5 that links to each other with described 2# reactor 4, and, is passed with new steam The pipeline leads in the described 1# reactor 3; Described flash evaporator comprises interconnected I-stage flash evaporator 9 and II-stage flash evaporator 10, wherein, described I-stage flash evaporator 9 and described 3# Reactor 5 links to each other, and, the gas...
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The invention relates to a mixing heating acid dissolving method and a mixing heating acid dissolving device for fly ash slurry, wherein the method comprises the following steps: a preheating step of the slurry, i.e. preheating the mixed slurry of fly ash and hydrochloric acid, which is prepared by mixing the fly ash with the hydrochloric acid, in a preheating device to raise temperature to be 40 to 70 DEG C; a heating step of the slurry, i.e. heating the preheated slurry in a reaction kettle by live steam to be 140 to 160 DEG C and carrying out heat preservation for 0.5 to 2 hours; and a step of carrying out concentration and temperature reduction on reaction slurry dissolved from the reaction kettle in a flash evaporator to be 118 to 125 DEG C and conveying the slurry subjected to temperature reduction to a dilution trap. The method is in the core position in the whole process for preparing alumina from the fly ash by an acid method. By the processes of the invention, the alumina in the fly ash reacts with the hydrochloric acid to be dissolved in a mode of aluminium chloride to enter solution so as to provide a basic raw material for the subsequent step of preparing the alumina.
Description
technical field [0001] The invention relates to a leaching process and device for preparing alumina by an acid method from fly ash, in particular to a method and device for leaching a fly ash slurry mixed heating acid method. Background technique [0002] The extraction of alumina from fly ash is the most important way of comprehensive utilization of fly ash, which can not only treat power plant waste residue, but also bring economic, environmental and social benefits, so it has received widespread attention. [0003] At present, the methods of producing alumina from fly ash are mainly concentrated in sintering method (lime sintering method, soda lime sintering method), alkali leaching method (sodium hydroxide solution first dissolves silicon and then extracts aluminum) and acid method (hydrochloric acid method, sulfuric acid method) . Aiming at the leaching process of preparing alumina by fly ash hydrochloric acid method, there is no such process technology at home and abr...
Claims
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CPCY02P20/129
Inventor 郭昭华周正明张万德池君洲王永旺董宏
Owner CHINA SHENHUA ENERGY CO LTD