Gangue comprehensive utilization method

A technology of coal gangue and kaolinite, which is applied in the field of comprehensive utilization of solid carbon-containing materials, can solve problems such as insufficient utilization of coal gangue and environmental pollution, and achieve the effects of increasing added value, improving utilization efficiency, and making full use of waste resources

Inactive Publication Date: 2012-10-10
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to propose a method for comprehensively utilizing coal gangue, aiming at the existing problems of i

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Coal gangue taken from Shuozhou area, Shanxi, has a calorific value of 6.27-12.6MJ / kg, and a carbon content of 10-20%. The components other than carbon are shown in Table 2, where "others" include TiO 2 ,P 2 o 5 、K 2 O, Na 2 O and V 2 o 5 Wait. The test method is XRF (X-ray fluorescence spectroscopy)

[0032] Table 2: Composition of coal gangue

[0033] Inorganic components

[0034] Coal gangue is pulverized by a pulverizer so that the particle size is less than or equal to 10mm, and burned in a boiling furnace. The temperature of the boiling material layer (fluidized bed) is 800-1100°C during combustion. The fluidized fluidized furnace is connected to the boiler to generate heat for external supply for domestic or industrial heat. The white inorganic ash after burning is melted in an induction furnace at 1600°C. In the gangue ash, add 8% bauxite (containing Al 3 o 2 The weight ratio is 55%), and the melted mixture is blown into a wire making machine...

Embodiment 2

[0036] The coal gangue taken from the Luliang area of ​​Shanxi has a calorific value of 7.54-12.6MJ / kg. The carbon content is 20-30%, and the components other than carbon are shown in Table 3, where "others" include TiO 2 ,P 2 o 5 、K 2 O, Na 2 O and V 2 o 5 Wait.

[0037] Table 3: Composition of coal gangue

[0038] Inorganic components

[0039] Coal gangue is pulverized by a pulverizer so that the particle size is less than or equal to 10mm, and burned in a boiling furnace. The temperature of the boiling material layer (fluidized bed) is 950-1100°C during combustion. The boiling furnace is connected to the boiler, and the steam generated drives the steam turbine to generate electricity. The white inorganic ash after burning is melted in an induction furnace at 1700°C, and bauxite (containing Al 3 o 2 The weight ratio is 45%), and the molten mixture is blown into a silk machine to obtain inorganic coal gangue fibers. The fiber has a diameter of 2-8 μm and ...

Embodiment 3

[0041] Coal gangue taken from the Luliang area of ​​Shanxi, with a calorific value of 6.27-12.6MJ / kg, is pulverized by a pulverizer to make the particle size less than or equal to 10mm, and burned in a boiling furnace. When burning, the boiling material layer (fluidized bed Layer) temperature is 800 ~ 1100 ℃. The fluidized fluidized furnace is connected to the boiler, which will generate heat for external supply. The white inorganic ash slag after burning is melted in an induction furnace at 2000° C., and in the gangue ash slag, bauxite (containing Al 3 o 2 weight ratio 42%), the molten mixture uses the centrifugal wire spinning method, and the liquid obtained by melting flows into the disc type wire spinning machine, and the rotating speed of the centrifugal disc in the disc type wire spinning machine is 2000r / min~10000r / min, and the silk that is thrown out is cooled Inorganic fibers are then obtained. The fiber has a diameter of 2-10 μm and an aspect ratio of 1000-2000. ...

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Abstract

The invention provides a gangue comprehensive utilization method. The method comprises the steps that: gangue is grinded into particles with a particle size smaller than or equal to 10mm; combustion is carried out in a fluidized bed roaster, and heat generated by combustion is used for civil use or industrial heat supply; additives are added to white inorganic ash after combustion; melting is carried out at a temperature of 1500-2000 DEG C; inorganic fiber is obtained by blowing melted mixtures or carrying out thread throwing upon the melted mixtures. According to the method provided by the invention, a technical route of complete utilization of the gangue is provided, and the technical route has great significance for methods and means of waste utilization development and additional value increasing of the gangue. The gangue comprehensive utilization method belongs to a new technology of the resource, energy cycle and regeneration utilization field; and by using the method, waste utilization efficiency can be improved and waste resources are fully utilized.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of solid carbonaceous materials, in particular to a method for comprehensively utilizing coal gangue to burn heat and prepare inorganic fibers. Background technique [0002] Coal is one of the main energy sources used by the human world since the Industrial Revolution in the 18th century. In my country's primary energy production and consumption structure, coal accounts for as much as 70%. For a long time in the future, the strategic position of coal as the main energy source will not change. During the mining and utilization of coal, waste generation is inevitable. [0003] Coal gangue is the waste rock associated with coal, and it is a kind of mining solid waste. At present, the amount of coal gangue discharged accounts for about 10% to 25% of the coal mining volume, and it has become the waste with the largest accumulated stockpile and site occupation in my country. According to stat...

Claims

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Application Information

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IPC IPC(8): C10L5/48F23C10/00F22B33/18C03B37/00
CPCY02E50/30
Inventor 王习东赵大伟张作泰刘丽丽
Owner PEKING UNIV
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