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Intensified lime-sintering method for preparing alumina clinker by adopting medium or high-grade alumyte

A lime sintering and bauxite technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of serious red mud refinement, poor sedimentation performance of red mud, lack of finding a suitable method for liquid-solid separation, etc. Alkali consumption, simple method, ideal effect

Inactive Publication Date: 2009-10-14
GUIZHOU NORMAL UNIVERSITY
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Problems solved by technology

However, due to the high alumina content of the clinker, the red mud is severely refined after dissolution, and the sedimentation performance of the red mud is extremely poor, and no suitable method for liquid-solid separation has been found.

Method used

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Embodiment Construction

[0018] Embodiment of the present invention: using medium and high-grade bauxite to prepare alumina clinker intensified lime sintering method, mixing bauxite with an aluminum-silicon ratio of 3.84 and an alumina content of 64.24% with calcium oxide to make the calcium-aluminum molar The amount ratio is 1.43, and the mixed material is sintered at 1300°C for 60 minutes to obtain clinker containing monocalcium aluminate and feldspar; the target product of the sintering ingredients is to make silicon generate feldspar, and generate feldspar in the The aluminum taken away does not enter into the batching calculation, wherein the aluminum is calculated with monocalcium aluminate as the target product, so the alumina content in the clinker is 50%.

[0019] The reaction principle during sintering is:

[0020] Al 2 o 3 +CaO=CaO·Al 2 o 3

[0021] 2CaO+Al 2 o 3 +SiO2 2 =2CaO·Al 2 o 3 ·SiO2 2

[0022] When treating the clinker, add sodium carbonate aqueous solution to the clink...

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Abstract

The invention discloses an intensified lime-sintering method for preparing alumina clinker by adopting medium or high-grade alumyte. The method includes the following steps: the medium or high-grade alumyte is mixed with calcium oxide, with the calcium-aluminium molar weight ratio ranging from 1.3 to 1.5; and the alumina-contained clinker can be obtained after the mixture is sintered for 30 to 90 minutes at a temperature ranging from 1270 DEG C to 1310 DEG C. The invention adopts an intensified lime-sintering method, i.e., the alumyte is added with calcium oxide. Compared with soda lime sintering method, the invention has the advantages that raw materials are broad in source, the clinker is dispensed with alkali, carbon seed pregnant liquor is not sintered, the alkali is circulated only in wet processing step, and dry sintering method with lower alkali consumption and lower energy consumption can be adopted. Besides, the invention also solves the difficulties that the clinker has high content of alumina, thinning of red mud dissolved from the clinker is serious, and the red mud is poor in settling property. The method, which is simple but has ideal using effect, solves the difficulties existing in the method of extracting alumina from medium or high-grade alumyte.

Description

technical field [0001] The invention relates to a method for extracting alumina, in particular to an enhanced lime sintering method for preparing alumina clinker by using medium and high-grade bauxite. Background technique [0002] my country's bauxite is characterized by high aluminum, high silicon, low iron, and low aluminum-silicon ratio. The bauxite with aluminum-silicon ratio greater than 7 that can be produced by pure Bayer process accounts for only 10%, and more than 60% of the bauxite has an aluminum-silicon ratio between 4 and 6. Therefore, it is of great application value to seek a more reasonable method of processing low-grade bauxite. Since the soda lime sintering method was applied to the industrial production of alumina, it has become an effective method for processing high-silicon bauxite and other high-silicon and aluminum-containing raw materials. However, the sintering method still has disadvantages such as complicated process, high energy consumption, an...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 张念炳黎志英刘卫何润德肖伟
Owner GUIZHOU NORMAL UNIVERSITY
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