Method and device for dissolving out diaspore under high pressure
A high-pressure dissolution, bauxite technology, applied in alumina/aluminum hydroxide, sustainable manufacturing/processing, climate sustainability, etc., can solve the problems of difficult to clean titanium scarring, high construction investment, low energy consumption, etc.
Inactive Publication Date: 2012-07-04
GUIYANG AL-MG DESIGN & RES INST
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Problems solved by technology
Although this method has the advantages of low energy consumption, low concentration of dissolved alkali (the circulating mother liquid Na2Ok is about 200g / l), good dissolution effect and good continuous production stability; Cleaning, if the cleaning is not clean, it will affect the thermal efficiency
Construction investment is also higher
Method used
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[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but not as any limitation to the present invention.
[0022] Example. The present invention as figure 1 shown. A diaspore high-pressure stripping method, the method is to send the raw ore slurry into the inner pipe 4 of the pipeline indirect heating device 1 through the high-pressure pump 2, and the steam or molten salt passing into the outer pipe 5 of the pipeline indirect heating device The raw ore slurry in the pipe 4 is heated, and the raw ore slurry is heated to the dissolution temperature and then enters the residence pipeline for 20 to 40 minutes before being transported to the subsequent process of the alumina production system. The heating to the dissolution temperature is 260-280°C. The flow velocity of the raw ore pulp in the inner pipe of the pipeline indirect heating device is more than 2.0m / s, including 2.0m / s; scar. The ...
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The invention discloses a method and a device for dissolving out diaspore under high pressure. The method comprises the following steps of: feeding the original ore pulp into an inner pipe of a pipeline indirect heating device by using a high-pressure pump; heating the original ore pulp in the inner pipe by steam or molten salt introduced into an outer pipe of the pipeline indirect heating device; after heating the original ore pulp to the dissolution temperature, allowing the original ore pulp to enter a retention pipeline for 20 to 40 minutes; and conveying the original ore pulp into the subsequent procedure of an aluminum oxide production system. According to the method and the device, a process can be simplified; heat transfer efficiency is improved; resistance loss of the pipelines is reduced; power (electricity) can be saved; the pipelines are convenient to clean and labor intensity is reduced; and industry and environmental protection are facilitated.
Description
technical field [0001] The invention relates to a high-pressure elution method and device for diaspore, and belongs to the technical field of high-pressure elution in Bayer process alumina production using diaspore as a raw material. Background technique [0002] The characteristic of diaspore is that it is difficult to dissolve. Therefore, it is required to use higher temperature (260℃~280℃), longer dissolution time and higher caustic alkali concentration when it is dissolved by Bayer method. There are two main methods currently used in production: [0003] The first one is pipeline preheating, mechanical stirring, indirect heating and autoclave dissolution method [0004] This method uses 5-6 pipeline indirect heaters to preheat the raw ore pulp to 160-170°C, then enters the autoclave and heats it to a dissolution temperature of about 260°C, and then stays in the autoclave for 40-60 minutes for dissolution , although this method has the advantages of low steam consumptio...
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IPC IPC(8): C01F7/02
CPCY02P20/10
Inventor 高振文白英伟
Owner GUIYANG AL-MG DESIGN & RES INST