Method for extracting silicon and aluminum by activating coal gangue through plasma ball milling and vibration fluidization calcination

A plasma ball and fluidization technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of high cost, non-conforming to energy saving and environmental protection, and high energy consumption, so as to improve the efficiency of ball milling and achieve ideal dissolution rate , the effect of low energy consumption

Active Publication Date: 2021-08-06
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From these two examples, it can be seen that although thermal activation can achieve a good activation effect, traditional static thermal activation usually requires heating coal gangue to above 700°C to destroy the kaolinite structure, so the energy consumption is huge. Does not conform to the concept of energy saving and environmental protection, and at the same time makes the cost higher

Method used

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  • Method for extracting silicon and aluminum by activating coal gangue through plasma ball milling and vibration fluidization calcination
  • Method for extracting silicon and aluminum by activating coal gangue through plasma ball milling and vibration fluidization calcination
  • Method for extracting silicon and aluminum by activating coal gangue through plasma ball milling and vibration fluidization calcination

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: A method for extracting silicon-alumina from coal gangue activated by plasma ball milling plus vibration fluidized calcination, the specific steps are as follows:

[0027] Crush the gangue to a particle size of 10-300 μm and accurately weigh 50 g;

[0028] Weigh 40 g of solid sodium carbonate, mix the weighed solid sodium carbonate with coal gangue powder, set the plasma ball mill vibration motor speed to 800 rpm, discharge voltage to 6 kV, discharge frequency to 20 kHz, and ball-to-material ratio to 30:1 , ball milled for 3 h under nitrogen atmosphere;

[0029] Raise the temperature of the vibrating fluidized bed calciner to 400°C, add the above powder into the vibrating fluidized bed calciner, set the air velocity to 9 cm / s, the vibration frequency of the vibrating table to 15 Hz, and time Calcined for 1 h;

[0030] Prepare a hydrochloric acid solution with a mass concentration of 15%, accurately weigh 525 g, cool the calcined powder for 7200 s, immers...

Embodiment 2

[0032] Embodiment 2: A method for extracting silicon-alumina from coal gangue activated by plasma ball milling plus vibration fluidized calcination, the specific steps are as follows:

[0033] Crush the gangue to a particle size of 10-500 μm and accurately weigh 50 g;

[0034] Weigh 50 g of solid sodium carbonate, mix the weighed solid sodium carbonate with coal gangue powder, set the plasma ball mill vibration motor speed to 1000 rpm, discharge voltage to 8 kV, discharge frequency to 30 kHz, and ball-to-material ratio to 30:1 , ball milled for 3 h under nitrogen atmosphere;

[0035] Raise the temperature of the vibrating fluidized bed calciner to 450°C, add the above powder into the vibrating fluidized bed calciner, set the air velocity to 10 cm / s, the vibration frequency of the vibrating table to 25 Hz, and time Calcination for 2h;

[0036] Prepare a hydrochloric acid solution with a mass concentration of 15%, accurately weigh 600 g, cool the calcined powder for 3600 s, im...

Embodiment 3

[0038] Embodiment 3: A method for extracting silicon-alumina from coal gangue activated by plasma ball milling plus vibration fluidized calcination, the specific steps are as follows:

[0039] Crush the gangue to a particle size of 10-500 μm and accurately weigh 50 g;

[0040]Weigh 25 g of solid sodium carbonate, mix the weighed solid sodium carbonate with coal gangue powder, set the plasma ball mill vibration motor speed to 1000 rpm, discharge voltage to 8 kV, discharge frequency to 30 kHz, and ball-to-material ratio to 30:1 , ball milled for 3 h under nitrogen atmosphere;

[0041] Raise the temperature of the vibrating fluidized bed calciner to 500°C, add the above powder into the vibrating fluidized bed calciner, set the air velocity to 10 cm / s, the vibration frequency of the vibrating table to 25 Hz, and time Calcined for 2 h;

[0042] Prepare a hydrochloric acid solution with a mass concentration of 15%, accurately weigh 450 g, cool the calcined powder for 10 s, immerse...

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Abstract

The invention belongs to the technical field of extraction of silicon and aluminum elements by activating coal gangue, and particularly relates to a method for extracting silicon and aluminum by activating coal gangue through plasma ball milling and vibration fluidization calcination, wherein the method comprises the steps: firstly, carrying out plasma ball milling treatment on a mixture of coal gangue and solid alkali to achieve the purposes of fully mixing and refining the coal gangue; meanwhile, mechanical pre-activation of the coal gangue can be achieved, then the coal gangue is calcined in the mode that air is introduced into the coal gangue solid powder to achieve solid fluidization, activation of the coal gangue can be achieved at the temperature lower than the traditional static calcination temperature, energy consumption in the coal gangue activation process is effectively reduced, and filtering and separating are carried out to obtain a silicon-aluminum mixed solution. The activation effect achieved at the temperature lower than the traditional static calcination activation temperature can reach the traditional static activation level, and the dissolution rate of aluminum oxide and silicon oxide is ideal.

Description

technical field [0001] The invention belongs to the technical field of coal gangue activation and extraction of silicon-aluminum elements, and specifically relates to a method for extracting silicon-aluminum elements from coal gangue activated by plasma ball milling plus vibration fluidized calcination, and further is a plasma ball mill preactivation and vibration fluidized calcination activation A combined method for activating coal gangue and extracting silicon and aluminum elements therein. Background technique [0002] Coal gangue is solid waste generated during coal mining and coal mining, and its emissions account for 10-30% of raw coal production. As solid waste, coal gangue is piled up in large quantities in the wild, which not only occupies land resources, but also causes environmental pollution and waste of resources. The annual cost of treating coal gangue cannot be underestimated. [0003] The main mineral component of coal gangue is kaolinite. Kaolinite is a mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/00C22B1/10C22B3/10C22B3/08C22B3/06C22B21/00B02C17/10B02C17/18
CPCC01B33/00C22B1/10C22B3/10C22B3/08C22B3/065C22B21/0007C22B21/0015B02C17/10B02C17/18Y02P10/20
Inventor 高峰夏晨康苗洋张鑫源刘维海
Owner TAIYUAN UNIV OF TECH
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