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Method for preparing aluminum tobermorite adsorbing material by using fire coal ash wastes

A technology of tobermorite and coal-burning ash, which is applied in the field of preparation of aluminum-substituted tobermorite adsorption materials, can solve problems such as complex methods, high preparation costs, and difficulty in popularization, and achieve strong adsorption and cation exchange capacity, It is beneficial to environmental governance and improves the effect of comprehensive utilization value

Active Publication Date: 2014-10-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many existing methods for preparing aluminum-substituted tobermorite adsorption materials, the methods are complicated, and the preparation cost is high, so it is not easy to popularize

Method used

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  • Method for preparing aluminum tobermorite adsorbing material by using fire coal ash wastes
  • Method for preparing aluminum tobermorite adsorbing material by using fire coal ash wastes
  • Method for preparing aluminum tobermorite adsorbing material by using fire coal ash wastes

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1) Put coal-fired ash in a ceramic crucible, calcinate in an electric furnace at 700°C for 1.5 hours, then cool to room temperature, and grind the calcined product thoroughly to obtain fine ash powder;

[0028] 2) Add dilute hydrochloric acid with a mass concentration of 1.5% to the ash fine powder according to the liquid-solid ratio of 5mL: 1g, heat and stir at 80°C for 2.0h to carry out acid leaching, filter, wash and dry after acid leaching, Obtain precursor ash powder;

[0029] 3) Combine ash powder, Ca(OH) 2Grinding and mixing, then adding NaOH therein and grinding and mixing uniformly to obtain a mixture; spraying a water glass solution on the mixture, and rotating and rolling to form a spherical particle of the tobermorite reactant precursor; wherein, Ca(OH) 2 Ca in and SiO in ash powder 2 The molar ratio of Si contained is 5:6; Ca(OH) 2 The molar ratio with NaOH is 1:1;

[0030] 4) Add water into the hydrothermal reaction kettle, and then set up a stainless ...

Embodiment 2

[0040] 1) Put the coal-fired ash in a ceramic crucible, calcinate it in an electric furnace at 650°C for 1.5 hours, then cool it to room temperature, and grind the calcined product thoroughly to obtain fine ash powder;

[0041] 2) Add dilute hydrochloric acid with a mass concentration of 1.6% to the ash fine powder according to the liquid-solid ratio of 4.8mL: 1g, heat and stir at a constant temperature of 70°C for 2.5h to carry out acid leaching, filter, wash and dry after acid leaching , to obtain the precursor ash powder;

[0042] 3) Combine ash powder, Ca(OH) 2 Grinding and mixing, then adding NaOH therein and grinding and mixing uniformly to obtain a mixture; spraying a water glass solution on the mixture, and rotating and rolling to form a spherical particle of the tobermorite reactant precursor; wherein, Ca(OH) 2 Ca in and SiO in ash powder 2 The molar ratio of Si contained is 5:6; Ca(OH) 2 The molar ratio with NaOH is 1:1.5;

[0043] 4) Add water into the hydrother...

Embodiment 3

[0045] 1) Put coal-fired ash in a ceramic crucible, calcinate in an electric furnace at 750°C for 1.0 h, then cool to room temperature, and grind the calcined product fully to obtain fine ash powder;

[0046] 2) Add dilute hydrochloric acid with a mass concentration of 1.3% to the ash fine powder according to the liquid-solid ratio of 5.3mL: 1g, heat and stir at a constant temperature of 75°C for 2.2h to carry out acid leaching, filter, wash and dry after acid leaching , to obtain the precursor ash powder;

[0047] 3) Combine ash powder, Ca(OH) 2 Grinding and mixing, then adding NaOH therein and grinding and mixing uniformly to obtain a mixture; spraying a water glass solution on the mixture, and rotating and rolling to form a spherical particle of the tobermorite reactant precursor; wherein, Ca(OH) 2 Ca in and SiO in ash powder 2 The molar ratio of Si contained is 5:6; Ca(OH) 2 The molar ratio with NaOH is 1:1.2;

[0048] 4) Add water into the hydrothermal reaction kettle...

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Abstract

The invention discloses a method for preparing an aluminum tobermorite adsorbing material by using fire coal ash wastes. The method comprises the following steps: calcining fire coal ash in an electric heating furnace, cooling to room temperature and grinding to obtain fine ash powder; subsequently leaching the fine ash powder by using diluted hydrochloric acid and then filtering, washing and drying to obtain a precursor ash powder body; grinding and mixing the ash powder body and Ca(OH)2, then adding NaOH into the mixture and grinding and mixing to be uniform to obtain a mixture; spraying a water glass solution to the mixture and rotationally rolling to form a spherical granular aluminum tobermorite reactant precursor; putting the aluminum tobermorite reactant precursor into a stainless steel wire cage drawer of a reaction kettle, performing a hydrothermal water-proof stilling reaction for 16-20 hours at the temperature of 170-190 DEG C; cooling and releasing the pressure after the reaction ends, and then separating out reaction products and drying to obtain the aluminum tobermorite adsorbing material. The material prepared by the method disclosed by the invention has good adsorption and decontamination effects and achieves the aim of preparing an environmental material with a relatively high additional value by using the fire coal ash.

Description

technical field [0001] The invention belongs to the field of ecological environment materials, and in particular relates to a method for preparing an aluminum-substituted tobermorite adsorption material by utilizing coal burning ash waste. Background technique [0002] Coal burning ash is a kind of industrial waste with huge emissions, mainly including fly ash, fluidized bed slag and sulfur-fixed ash (referred to as sulfur-fixed ash). At present, the discharge of fly ash in my country's coal-fired ash is the largest. The annual discharge of fly ash has reached more than 200 million tons, and its cumulative stacking volume is about 4 billion tons. Less than 30%. Although the emission of boiling slag has been decreasing year by year in recent years, the total emission of coal burning ash has not decreased. Ash piles not only take up a lot of valuable land resources, but also cause serious environmental pollution. Coal burning ash is also a common solid waste produced by ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30
Inventor 张超武宋大龙缪金良时春辉王芬张利娜俱欢
Owner SHAANXI UNIV OF SCI & TECH
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