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Supercritical (or subcritical) activation method for coal gangue and application of supercritical (or subcritical) activation method

A coal gangue and reaction technology, applied in the field of coal gangue activation, can solve the problems of large acid consumption, difficult operation, high acid concentration, etc., and achieve the effects of good environmental protection, simple reaction device, and low activation temperature

Active Publication Date: 2019-01-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the literature, we can see that this kind of method adopts mechanical activation. The activated sample needs to use high-concentration sulfuric acid in the acid leaching process to make the alumina dissolution rate in coal gangue reach 95.5%. Large consumption, high acid concentration also brings difficulties to operation

Method used

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  • Supercritical (or subcritical) activation method for coal gangue and application of supercritical (or subcritical) activation method
  • Supercritical (or subcritical) activation method for coal gangue and application of supercritical (or subcritical) activation method
  • Supercritical (or subcritical) activation method for coal gangue and application of supercritical (or subcritical) activation method

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Effect test

Embodiment 1

[0041] 1) Coal gangue activation: Accurately weigh Al 2 o 3 The content is 24.88% and SiO 2 The content is 10g of Pingshuo coal gangue of 32.40%, the configuration molar concentration is the NaOH aqueous solution of 2.0mol / L, the NaOH aqueous solution and the weighed coal gangue are mixed in a 50ml beaker according to the volume mass ratio of 10:1ml / g, room temperature Stir for 10 min. Then the stirred solution was moved to a reaction kettle, and reacted at 350° C. under supercritical conditions of 15 MPa for 10 minutes. The water was cooled to room temperature, filtered, washed, and the filter cake was dried at 110°C for 10 hours. And the filtrate obtained by solid-liquid separation and washing liquid are combined to obtain lithium-containing solution I;

[0042] 2) Acid leaching of aluminum, silicon, and gallium: the activated coal gangue sample was mixed with 1 mol / L hydrochloric acid according to the solid-to-liquid ratio of 1:10 g / ml, and reacted at room temperature f...

Embodiment 2

[0049] 1) Coal gangue activation: Accurately weigh Al 2 o 3 The content is 24.88% and SiO 2 20g of Pingshuo coal gangue with a content of 32.40%, and a NaOH aqueous solution with a molar concentration of 2.0mol / L, and the NaOH aqueous solution and the weighed coal gangue are mixed in a 50ml beaker at a volume-to-mass ratio of 20:1ml / g. Stir for 10 min. Then the stirred solution was moved to a reaction kettle, and reacted at 350° C. under supercritical conditions of 15 MPa for 10 minutes. The water was cooled to room temperature, filtered, washed, and the filter cake was dried at 110°C for 10 hours. And the filtrate obtained by solid-liquid separation and washing liquid are combined to obtain lithium-containing solution I;

[0050] 2) Acid leaching of aluminum, silicon, and gallium: the activated coal gangue sample was mixed with 1 mol / L hydrochloric acid according to the solid-to-liquid ratio of 1:10 g / ml, and reacted at room temperature for 7 hours to dissolve the reactan...

Embodiment 3

[0057] 1) Coal gangue activation: Accurately weigh Al 2 o 3 The content is 20.79% and SiO2 20g of Pingshuo coal gangue with a content of 31.85%, and a KOH aqueous solution with a molar concentration of 2.0mol / L, and the KOH aqueous solution and the weighed coal gangue are mixed in a 50ml beaker at a volume-to-mass ratio of 15:1ml / g. Stir for 10 min. Then the stirred solution was moved to a reaction kettle, and reacted at 250° C. under supercritical conditions of 3 MPa for 10 min. The water was cooled to room temperature, filtered, washed, and the filter cake was dried at 110°C for 10 hours. And the filtrate obtained by solid-liquid separation and washing liquid are combined to obtain lithium-containing solution I;

[0058] 2) Acid leaching of aluminum, silicon, and gallium: the activated coal gangue sample was mixed with 1 mol / L hydrochloric acid according to the solid-to-liquid ratio of 1:30 g / ml, and reacted at room temperature for 3 hours to dissolve the reactant, filter...

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Abstract

The invention relates to a subcritical or supercritical activation method for coal gangue. According to the method, alkali as an auxiliary is added to the coal gangue and the coal gangue is subjectedto an activating reaction under the subcritical or supercritical condition, and an activated coal gangue sample can be obtained. The invention further relates to a comprehensive utilization method ofthe coal gangue. According to the comprehensive utilization method, the activated coal gangue sample obtained by subcritical or supercritical activation is subjected to a contact reaction with acid, by means of acid leaching, not only can an aluminum oxide product and a white carbon black product be obtained, but also lithium and gallium which are enriched in the coal gangue can be extracted, final filter residues are used for preparing raw materials of cement, and one zero-pollution and zero-emission way of coal gangue waste recovery is really obtained. The methods have the advantages as follows: coal gangue can be activated at the low temperature of about 400 DEG C, few operation steps are required, reaction temperature is low, reaction time is short, no secondary pollution is produced in the whole process, and the novel environment-friendly coal gangue activation method and the way of coal gangue waste recovery are obtained.

Description

technical field [0001] The invention relates to an activation method of coal gangue and a comprehensive utilization method thereof, in particular to a method for supercritical activation of coal gangue and a comprehensive utilization method of coal gangue. Background technique [0002] Coal gangue is a kind of coal-bearing kaolin associated with coal, and the comprehensive discharge of coal gangue accounts for 10% to 15% of the raw coal output. Coal gangue is an "industrial waste" with three hazards of solid, liquid and gas. Its long-term stacking occupies a large amount of land, and pollutes the water source, soil and surrounding air around the mining area, seriously damaging the ecological environment and ecology of the mining area. landscape. [0003] Coal gangue generally contains silicon-alumina as the main component, and also contains varying amounts of Fe. 2 o 3 , CaO, MgO, K 2 O, Na 2 O.P 2 o 3 and other inorganic substances. In addition, the content of lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B3/06C22B3/44C22B21/00C22B26/12C22B58/00C01B33/12C04B7/24
CPCC01B33/12C04B7/24C22B3/06C22B3/12C22B3/44C22B21/0015C22B26/12C22B58/00Y02P10/20Y02P20/54Y02P40/10Y02P40/18
Inventor 韩丽娜任卫国何星星胡江亮常丽萍鲍卫仁王建成
Owner TAIYUAN UNIV OF TECH
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