Method for preparing porous ceramic from coal gangue

A technology of porous ceramics and coal gangue, which is applied in the production and application of ceramic products and ceramic materials, which can solve the problems of single function of porous ceramics and low utilization rate of coal gangue, and achieve the effect of uniform pore formation and stable structure

Active Publication Date: 2020-10-13
淄博钛金窑炉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems and overcome the deficiencies of the prior art, the present invention provides a method for preparing porous ceram

Method used

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  • Method for preparing porous ceramic from coal gangue
  • Method for preparing porous ceramic from coal gangue
  • Method for preparing porous ceramic from coal gangue

Examples

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[0030] Example 1:

[0031] The method for preparing porous ceramics from coal gangue is characterized in that it includes:

[0032] (1) Acid reaction pretreatment of coal gangue:

[0033] The coal gangue block is pressed into shape and calcined in an electric furnace (high temperature tunnel kiln). When the finished product is discharged from the kiln, it is quickly cooled to room temperature by quenching air to obtain calcined coal gangue clinker; the calcined coal gangue clinker is subjected to dry ball milling for 48 hours, Then pass through a 180-mesh sieve to obtain fine coal gangue clinker powder;

[0034] Add coal gangue clinker fine powder to the hydrochloric acid solution, and stir at 85°C for 1 hour for acid leaching to obtain the acid-treated product; where the mass concentration of hydrochloric acid is 7%, the hydrochloric acid solution and the fine coal gangue clinker powder The liquid-solid ratio is: 5mL / g;

[0035] (2) Pre-treatment of coal gangue melting:

[0036] Place...

Example Embodiment

[0048] Example 2:

[0049] The method for preparing porous ceramics from coal gangue is characterized in that it includes:

[0050] (1) Acid reaction pretreatment of coal gangue:

[0051] The coal gangue block is pressed into shape and calcined in an electric furnace (high temperature tunnel kiln). When the finished product is discharged from the kiln, it is quickly cooled to room temperature by quenching air to obtain calcined coal gangue clinker; the calcined coal gangue clinker is subjected to dry ball milling for 48 hours, Then pass a 200-mesh sieve to obtain fine coal gangue clinker powder;

[0052] Add the fine coal gangue clinker powder to the hydrochloric acid solution, and stir at 95°C for 1.5 hours for acid leaching to obtain the acid-treated product; wherein the mass concentration of hydrochloric acid is 20%, the hydrochloric acid solution and the fine coal gangue clinker powder The liquid-solid ratio is: 25mL / g;

[0053] (2) Pre-treatment of coal gangue melting:

[0054] Pl...

Example Embodiment

[0068] Example 3:

[0069] The method for preparing porous ceramics from coal gangue is characterized in that it includes:

[0070] (1) Acid reaction pretreatment of coal gangue:

[0071] The coal gangue block is pressed into shape and calcined in an electric furnace (high temperature tunnel kiln). When the finished product is discharged from the kiln, it is quickly cooled to room temperature by quenching air to obtain calcined coal gangue clinker; the calcined coal gangue clinker is subjected to dry ball milling for 48 hours, Then pass a 190-mesh sieve to obtain fine coal gangue clinker powder;

[0072] Add coal gangue clinker fine powder to the hydrochloric acid solution, and stir at 90°C for 1 hour for acid leaching to obtain the acid-treated product; wherein the mass concentration of hydrochloric acid is 15%, the hydrochloric acid solution and the coal gangue clinker fine powder The liquid-solid ratio is: 15mL / g;

[0073] (2) Pre-treatment of coal gangue melting:

[0074] Place the...

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Abstract

The invention discloses a method for preparing porous ceramic from coal gangue. The method is characterized by comprising the following steps of: carrying out acid reaction pretreatment on coal gangue, carrying out melting pretreatment on the coal gangue, adding citric acid and a protective agent, carrying out mixing, stirring until the materials are molten, carrying out mixing, drying to obtain coal gangue powder, screening the coal gangue powder, adding a proper amount of paraffin oil, carrying out aging, carrying out injection molding, carrying out degreasing, carrying out low-temperature calcination, and carrying out pressurized high-temperature calcination to obtain porous ceramic, wherein the protective agent is calcium citrate porous carbon. The method has the beneficial effects that pore forming is completed in a biscuit forming stage by utilizing capillary force formed between raw material solid particles and two liquid phases; and alumina of coal gangue and a citric acid principle are utilized, calcium citrate porous carbon is creatively added, high-pressure calcination is carried out, generated molten aluminum chloride is protected, pore forming is completed by utilizingcapillary force formed between raw material solid particles and two liquid phases, silicon and aluminum oxides of coal gangue are fully utilized, and the porous ceramic with catalytic activity is generated by adopting a one-step method.

Description

Technical field: [0001] The invention belongs to the technical field of inorganic non-metallic materials, and more specifically relates to a method for preparing porous ceramics from coal gangue. Background technique: [0002] Coal gangue is a kind of rock associated and symbiotic with coal in the process of coal formation, and it is a solid waste generated in the process of coal production and processing. Coal gangue is the industrial solid waste with the largest discharge in my country. A large amount of coal gangue will not only occupy land and affect the ecological environment, but the leaching water of gangue will pollute the surrounding soil and groundwater. Spontaneous combustion occurs under suitable conditions, and harmful gases such as sulfur dioxide, nitrogen oxides, carbon oxides, and smoke are emitted to pollute the atmospheric environment and affect the health of residents in mining areas. With the advancement of science and technology, people are increasingly ...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B33/132C04B33/13
CPCC04B38/068C04B38/0645C04B33/132C04B33/131C04B33/1305C04B2235/6583C04B2235/658C04B2235/6567Y02P40/60
Inventor 张洪伟
Owner 淄博钛金窑炉科技有限公司
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