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Method for preparing phacellite by using coal ash as raw material

A technology of fly ash and kalephine, applied in the field of deep processing and utilization of fly ash resources, can solve the problems of easy carbon deposition, catalyst passivation, etc., and achieve the effects of low cost, good thermal stability, and easy availability of raw materials

Inactive Publication Date: 2009-12-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Catalyst active components in contact with hydrocarbons or their derivatives are prone to carbon deposition, leading to catalyst passivation

Method used

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  • Method for preparing phacellite by using coal ash as raw material
  • Method for preparing phacellite by using coal ash as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) drying the fly ash, dry gradient magnetic separation;

[0019] 2) The fly ash and potassium hydroxide after magnetic separation are mixed in a mass ratio of 1:0.1, placed in a crucible in a muffle furnace, heated to 850°C, and roasted at a constant temperature for 1 hour;

[0020] 3) Add 0.5M acid to the roasted product of fly ash at a solid-to-liquid ratio of 1:1, and dissolve in the acid for 1 hour; stir;

[0021] 4) After the acid dissolution is finished, the filter residue is filtered, washed and dried to obtain the fly ash pretreatment sample;

[0022] 5) Weigh the fly ash pretreatment sample, add 1M potassium hydroxide solution according to the solid-to-liquid ratio of 1:2, place the reaction mixture in a stainless steel reactor, heat to 120°C, hydrothermally react for 8 hours, filter and wash , dried to obtain kalephine, its XRD pattern is shown in figure 1 , SEM image see figure 2 .

Embodiment 2

[0024] 1) drying the fly ash, dry gradient magnetic separation;

[0025] 2) The fly ash and potassium hydroxide after magnetic separation are mixed in a mass ratio of 1:0.3, placed in the crucible of a muffle furnace, heated to 1000°C, and roasted at a constant temperature for 2 hours;

[0026] 3) Add 1.5M acid to the fly ash roasted product at a solid-to-liquid ratio of 1:2, and dissolve in the acid for 2 hours; during the acid-dissolving process, add 0.5M sodium oxalate at a solid-to-liquid ratio of 1:0.5 and keep stirring;

[0027] 4) After the acid dissolution is finished, the filter residue is filtered, washed and dried to obtain the fly ash pretreatment sample;

[0028] 5) Weigh the fly ash pretreatment sample, add 3M potassium hydroxide solution according to the solid-to-liquid ratio of 1:2, place the reaction mixture in a stainless steel reactor, heat to 180°C, hydrothermally react for 12 hours, filter and wash , drying to obtain kalpheline.

Embodiment 3

[0030] 1) drying the fly ash, dry gradient magnetic separation;

[0031] 2) The fly ash and potassium hydroxide after magnetic separation are mixed in a mass ratio of 1:0.2, placed in a crucible in a muffle furnace, heated to 900°C, and roasted at a constant temperature for 1.5 hours;

[0032] 3) Add 1M acid to the fly ash roasted product at a solid-to-liquid ratio of 1:3, and dissolve in the acid for 1.5 hours; during the acid-dissolving process, add 0.3M sodium citrate at a solid-to-liquid ratio of 1:0.2 and keep stirring;

[0033] 4) After the acid dissolution is finished, the filter residue is filtered, washed and dried to obtain the fly ash pretreatment sample;

[0034] 5) Weigh the fly ash pretreatment sample, add 2M potassium hydroxide solution according to the solid-to-liquid ratio of 1:2, place the reaction mixture in a stainless steel reactor, heat to 160°C, hydrothermally react for 10 hours, filter and wash , drying to obtain kalpheline.

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Abstract

The invention discloses a method for preparing phacellite by using coal ash as a raw material, which comprises the following steps: 1) drying the coal ash, and carrying out gradient magnetic separation of dry method; 2) mixing the magnetically-separated coal ash and potassium hydroxide according to a mass ratio of 1:0.1-0.3, adding the mixture into a crucible of a muffle furnace, heating the mixture, and baking the mixture at a constant temperature; 3) adding acid into a baked product of the coal ash according to a solid-liquid ratio of 1:1-5, dissolving the baked product in the acid for 1 to 2 hours, adding a chelating agent into the mixture according to a solid-liquid ratio of 1:0.1-0.5 during acid dissolution, and continually stirring the mixture; 4) after the acid dissolution is finished, filtering, washing and drying the filter residue to obtain a coal ash pretreatment sample; and 5) adding potassium hydroxide solution into the coal ash pretreatment sample according to a solid-liquid ratio of 1:2-5, adding the mixture into a stainless steel reaction kettle, heating the mixture to carry out hydrothermal reaction, and filtering, washing and drying a reaction product to obtain a phacellite product. The method overcomes the defects of the prior art such as high cost, uneven chemical components of the product and the like, achieves resource utilization of the solid waste coal ash, and has environmental and economic double benefits.

Description

technical field [0001] The invention relates to the field of deep processing and utilization of fly ash as a resource, in particular to a method for preparing kalpheline with fly ash as a raw material. Background technique [0002] Catalyst active components contact with hydrocarbons or their derivatives are prone to carbon deposition, resulting in catalyst passivation. Therefore, in addition to good activity, strength and stability, the hydrocarbon steam reforming catalysts used in industry also require good carbon deposition resistance. In addition, catalysts with strong acid centers and stronger basic catalysts are prone to coking, so adding alkali metal additives, other oxide-modified additives or weakly basic substances to the catalyst is beneficial to the catalytic reaction. The addition of basic component potassium during catalyst preparation can not only inhibit the cracking reaction of hydrocarbons; at the same time, potassium is mobile during the conversion proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26B09B3/00
Inventor 叶瑛姚志通张路李海晏夏枚生戴凌青
Owner ZHEJIANG UNIV
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