Method for preparing sodium metaaluminate solution for synthesis of zeolite with diasporite

A sodium metaaluminate and synthetic zeolite technology, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, can solve the problems of large investment, high equipment and process requirements, and achieve simplified process, reduced production cost, The effect of increasing the yield

Inactive Publication Date: 2003-03-12
韩设民
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Problems solved by technology

However, regardless of the mature Bayer method, the sintering method or some improvements to the method are used to prepare sodium aluminate solution, and then separate and extract Al(OH) 3 In the process, the requirements for equipment and technology are relatively high, and the investment is also relatively large.

Method used

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  • Method for preparing sodium metaaluminate solution for synthesis of zeolite with diasporite
  • Method for preparing sodium metaaluminate solution for synthesis of zeolite with diasporite

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Embodiment 6

[0023] Embodiment 6: with 800 kilograms of bauxite of embodiment 1, lye (its composition is NaOH31.28%, Al 2 o 3 1.76%) 880 kg, 400 kg of soda ash (purity 98%), stir evenly in a blender, piled up into bricks, its volume is 24 × 12 × 5.5cm 3 , each brick with a wet weight of about 3.2 metric meters is loaded into a pit car, each pit car can be coded with 8 layers of bricks, and 60 blocks per layer are pushed into the tunnel cellar, calcined to 1080 ° C, kept for 1 hour, taken out and cooled to about 500 ° C, Quickly pour in 4800 kg of lye (its composition is NaOH7.11%, Al 2 o 3 0.41%), stir evenly, at this time the solution is in a boiling state, after keeping for 1 hour, stop stirring, settle statically for 10 minutes, put the mother liquor in the storage tank, then pour it into the filter press, and then press the precipitate into the filter press In, finally get 4800 kilograms of sodium metaaluminate solution, referred to as A (its composition is: Na 2 O11.29%, Al 2 o ...

Embodiment 7

[0026] Embodiment 7: with bauxite 10T in embodiment 1, soda ash (purity 98%) 6T, lye (its composition is NaOH40%, Al 2 o 3 2.1%) 12T is carried out by the operating method of embodiment 6, and the sample after calcining is poured in the lye of 59.6T (its composition is NaOH7.0%, Al 2 o 3 0.41%), dissolved to obtain sodium metaaluminate solution 58.1T (its composition is Na 2 O11.93%, Al 2 o 3 8.72%), residue 12.6T.

[0027] Residue returns calcining again, and its second batching is: bauxite 8T, soda ash (purity 98%) 4T, liquid caustic soda (its composition is NaOH: 40%, Al 2 o 3 : 2.1%) 8T, residue 12.6T, carry out by the operation method of embodiment 6 equally, after calcining, pour in the liquid caustic soda of 60.5T (its composition is NaOH7%, Al 2 o 3 2.1%) is dissolved to obtain sodium metaaluminate solution 59.5T (its composition is Na 2 O11.92%, Al 2 o 3 8.7%) residue was discarded at 12.1T. (its composition is Na 2 O27.53%, Al 2 o 3 25.7%, SiO 2 16.65...

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Abstract

A process for preparing the solution of sodium metaaluminate used to synthesize zeolite includes mixing bauxite with aqueous solution of alkali; shaping, calcining, cooling, dissolving in alkali solution, stirring, settling separation, and filtering the mother liquid to obtain the solution of sodium metalluminate. Its advantages are lower calcining temp and simple process.

Description

1. Technical field [0001] The invention relates to a method for preparing a sodium metaaluminate solution, more specifically a method for directly preparing a sodium metaaluminate solution for synthesizing zeolite by using durasite. 2. Background technology [0002] Sodium metaaluminate is one of the main raw materials for the synthesis of A.X.L.Ω and other zeolites. Most manufacturers use aluminum hydroxide and (liquid) alkali (NaOH) to react, and the production cost is relatively high; some manufacturers use hydrochemical methods to prepare by reacting gibbsite and (liquid) alkali (NaOH). As we all know, my country's gibbsite only accounts for about 2% of the bauxite reserves and cannot be used in large quantities; for some aluminum companies, most of them use aluminum ash or produce Al(OH) 3 When the semi-finished product - NaAl (OH) 4 To produce zeolite, there are also some units that use waste pure aluminum products to react with (liquid) alkali (NaOH) to extract sodi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06
Inventor 韩设民
Owner 韩设民
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