Method for preparing special fracturing propping agent for shale gas by utilizing low-carbon coal gangue

A fracturing proppant and coal gangue technology, which is applied in the fields of earthwork drilling, climate sustainability, sustainable manufacturing/processing, etc., can solve the problems of low-density high-strength fracturing proppant, low thermal efficiency, and high heat loss , to achieve the effect of shortening the sintering cycle, increasing the product yield and reducing the sintering temperature

Inactive Publication Date: 2013-09-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, low-carbon coal gangue is mainly used for road construction, grouting materials, backfill materials, production of cement, wall materials and chemical raw materials. Its development and utilization have the characteristics of rough processing, low thermal efficiency, and high energy consumption. Especially In the preparation of sintered materials, the heat loss of ordinary heating methods is as high as more than 50%, and the fuel accounts for more than half of the total production cost
So far, there have been no reports or patents on the development of low-density, high-strength fracturing proppants using low-carbon coal gangue in a self-propagating manner

Method used

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  • Method for preparing special fracturing propping agent for shale gas by utilizing low-carbon coal gangue
  • Method for preparing special fracturing propping agent for shale gas by utilizing low-carbon coal gangue

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Put the low-carbon coal gangue into a ball mill and use alumina balls as balls for dry grinding for 0.5h, and then pass through a 120-mesh sieve to obtain coal gangue powder. Mesh sieve, collect the sieve residue particles between the two sieves to become coal gangue masterbatch; put industrial coke into a ball mill and use alumina balls as balls for dry grinding for 0.5h, and then pass through a 180 mesh sieve to obtain coke powder; Among them, when dry grinding low-carbon coal gangue, control the mass ratio of alumina ball stone and low-carbon coal gangue to 3:1, and when dry grinding industrial coke, control the mass ratio of alumina ball stone and industrial coke to 3:1;

[0031] 2) According to the mass percentage, mix 68% coal gangue powder, 25% manganese slag, 6.5% silicon micropowder, and 0.5% industrial coke to obtain a mixture; then put the mixture into a ball mill to obtain alumina ball stone Add water to the balls and mix for 0.5 hours to form a mixed slu...

Embodiment 2

[0038] 1) Put the low-carbon coal gangue into a ball mill and use alumina balls as balls for dry grinding for 0.8h, and then pass through a 120-mesh sieve to obtain coal-gangue powder. Mesh sieve, collect the sieve residue particles between the two sieves to become coal gangue masterbatch; put industrial coke into a ball mill and use alumina balls as balls for dry grinding for 0.8h, and then pass through a 180 mesh sieve to obtain coke powder; Among them, when dry grinding low-carbon coal gangue, control the mass ratio of alumina ball stone and low-carbon coal gangue to 2.8:1, and when dry grinding industrial coke, control the mass ratio of alumina ball stone and industrial coke to 2.8:1;

[0039] 2) According to the mass percentage, mix 70% of coal gangue powder, 22% of manganese slag, 7.3% of silicon micropowder, and 0.7% of industrial coke to obtain a mixture; then put the mixture into a ball mill to form alumina balls Add water to the grinding balls and wet grind for 1 hou...

Embodiment 3

[0045] 1) Put the low-carbon coal gangue into a ball mill and use alumina balls as balls for dry grinding for 1 hour, then pass through a 120-mesh sieve to obtain coal gangue powder, and pass the low-carbon coal gangue that has not passed the 120-mesh sieve through 48-70 mesh Sieve, collect the sieve residue particles between the two sieves to become coal gangue masterbatch; put industrial coke into a ball mill and use alumina ball stone as a ball for dry grinding for 1 hour, and then pass through a 180-mesh sieve to obtain coke powder; among them, When dry grinding low-carbon coal gangue, control the mass ratio of alumina ball stone and low-carbon coal gangue to 2.5:1, and when dry grinding industrial coke, control the mass ratio of alumina ball stone and industrial coke to 2.5:1;

[0046] 2) According to the mass percentage, mix 73% of coal gangue powder, 16.1% of manganese slag, 10% of silicon micropowder, and 0.9% of industrial coke to obtain a mixture; then put the mixture...

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Abstract

The invention discloses a method for preparing a special fracturing propping agent for shale gas by utilizing low-carbon coal gangue. The method comprises the following steps of: ball milling the low-carbon coal gangue, sieving, taking the sieved coal gangue, placing the sieved coal gangue, coke, silicon micropowder and manganese slags in ball mill, wet grinding, and thus forming a mixed slurry, drying the mixed slurry by adopting a spray drying tower, scattering, taking coal gangue master batches as seeds, pelleting in a sugarcoating machine to form dense balls, forming by coating coke dust, placing the formed particles in a crucible, placing in an electric furnace, sintering at ultralow temperature by adopting a self-spreading manner, naturally cooling, and taking out, thus obtaining the special fracturing propping agent for the shale gas. The method provided by the invention has the advantages of being beneficial for saving high-quantity natural mineral resources, reducing firing temperature, shortening burning period, saving energy sources, and improving the combination property of a product; a secondary balling process is adopted for molding, the self spreading sintering advantage is displayed, the energy consumption is greatly reduced, the operation is convenient and easy to control, and the method is beneficial for industrialized large-scale production; the prepared propping agent has the good characteristics of low density, high intensity, high temperature resistance, high corrosion resistance and the like.

Description

technical field [0001] The invention belongs to the field of new materials, and relates to a method for preparing a proppant, in particular to a method for preparing a special fracturing proppant for shale gas by using low-carbon coal gangue. Background technique [0002] Coal gangue is a kind of dark rock with low carbon content and relatively hard that is associated with coal seams during the coal formation process, and is a rare secondary resource. During the coal mining process, a large amount of coal gangue will inevitably be produced. At present, coal gangue has become the industrial waste with the largest cumulative stock and the most land occupation in my country. Coal gangue is mostly stacked in the open air, which will generate a lot of dust. After being eroded by rainwater, it will produce acidic water and pollute the surrounding water bodies and land. When the coal gangue is stacked unreasonably, it is easy to cause slope instability, leading to the collapse an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/185C04B35/80C04B35/64C09K8/80
CPCY02P20/10
Inventor 陈平殷海荣
Owner SHAANXI UNIV OF SCI & TECH
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