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A method for preparing low-density ceramsite proppant using high-alumina fly ash as raw material

A high-aluminum fly ash and low-density technology, applied in chemical instruments and methods, earth square drilling, clay products, etc., can solve the problems of low utilization rate of fly ash, affecting the drying of slurry drying pellets, and high production costs , to achieve the effect of promoting particle rearrangement and mass transfer process, improving pulping and sintering performance, and solving the problem of difficult sintering and densification

Active Publication Date: 2018-01-26
JINGANG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because these substances have very low density, they often float above when mixed with other materials, it is difficult to be ground and mixed evenly, and it is easy to cause segregation of materials
At the same time, most of the particle state of fly ash is loose fine powder aggregates. Its loose and porous structure makes it have a large internal surface area, which will make the material absorb a large amount of water during the grinding process and make the slurry fluidity. and poor stability, affecting slurry drying and billet drying
In addition, the unburned residual carbon is oxidized and volatilized during the firing process, and a large number of hole defects are generated inside the ceramsite particles, which increases the breakage rate of the ceramsite; Glass phase, which causes particles to stick to each other, and production problems such as rotary kiln ring formation and kiln sticking occur
Therefore, the use of fly ash to prepare ceramsite proppants generally has disadvantages such as low utilization rate of fly ash, high production cost, low density of sintered body, and low product strength.

Method used

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  • A method for preparing low-density ceramsite proppant using high-alumina fly ash as raw material
  • A method for preparing low-density ceramsite proppant using high-alumina fly ash as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The chemical composition and mass ratio thereof of the formula raw material of the present embodiment are as follows: Al 2 o 3 : 44.6%, SiO 2 : 46.3%, Fe 2 o 3 : 1.9%, TiO 2 : 1.2%, CaO+MgO: 3.7%, Na 2 O+K 2 O: 0.5% and loss on ignition.

[0034] The raw materials used are: 140kg high alumina fly ash raw ash, 40kg high alumina fly ash burnt ash, 7kg kaolin, 3kg dolomite, 3kg talc, 7kg river sand, 0.3kg sodium polyacrylate, 0.3kg sodium tripolyphosphate , 0.06kg starch.

[0035] The preparation process includes the following steps:

[0036] (1) Part of the fly ash is dry ball-milled to a 325-mesh sieve and the residue is less than 0.5%;

[0037] (2) Using a rotary kiln, part of the high-alumina fly ash is calcined at a temperature of 1200°C; the calcining time is 2 hours, which is the high-alumina fly ash after burning;

[0038] (3) 40% high-alumina fly ash raw ash, 40% high-alumina fly ash burnt ash, 7% kaolin, 3% dolomite, 3% talc, 7% river sand, and 0.3% pol...

Embodiment 2

[0048] The chemical composition and mass ratio thereof of the formula raw material of the present embodiment are as follows: Al 2 o 3 : 45.5%, SiO 2 : 45.9%, Fe 2 o 3 : 2.0%, TiO 2 : 1.2%, CaO+MgO: 3.4%, Na 2 O+K 2 O: 0.4% and loss on ignition.

[0049] The raw materials used are: 180kg high alumina fly ash raw ash, 52kg high alumina fly ash burned ash, 8kg kaolin, 3kg dolomite, 3kg talc, 4kg river sand, 0.3kg sodium hexametaphosphate, 0.3kg tripolyphosphoric acid Sodium, 0.11kg polyvinyl alcohol.

[0050] (1) Part of the fly ash is dry ball-milled to a 325-mesh sieve with a residue of less than 0.5%, which is high-aluminum fly ash raw ash;

[0051] (2) Use a rotary kiln to calcine part of the high-alumina fly ash at a calcination temperature of 1100°C; the calcination time is 2 hours;

[0052] (3) 30% high alumina fly ash raw ash, 52% high alumina fly ash burnt ash, 8% kaolin, 3% dolomite, 3% talc, 4% river sand, plus 0.3% six by mass percentage Mix sodium metaphosp...

Embodiment 3

[0061] The chemical composition and mass ratio thereof of the formula raw material of the present embodiment are as follows: Al 2 o 3 : 44.8%, SiO 2 : 45.4%, Fe 2 o 3 : 1.8%, TiO 2 : 1.1%, CaO+MgO: 3.5%, Na 2 O+K 2 O: 0.6% and loss on ignition.

[0062] The raw materials used are: 107.9kg high alumina fly ash raw ash, 20kg high alumina fly ash burnt ash, 10kg kaolin, 2kg dolomite, 2kg talc, 1kg river sand, 0.3kg sodium citrate, 0.55kg tripolyphosphoric acid Sodium, 0.07kg gum arabic.

[0063] (1) Part of the fly ash is dry ball-milled to a 325-mesh sieve and the residue is less than 0.5%;

[0064] (2) Use a rotary kiln to calcine part of the high-alumina fly ash at a calcination temperature of 1250°C; the calcination time is 1 hour;

[0065] (3) 65% high-alumina fly ash raw ash, 20% high-alumina fly ash burnt ash, 10% kaolin, 2% dolomite, 2% talc, 1% river sand, and 0.3% lemon by mass percentage Sodium phosphate and 0.55% sodium tripolyphosphate are mixed evenly;

...

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Abstract

The invention discloses a method for preparing a low-density ceramsite proppant from high-alumina fly ash. The method comprises the steps: (1) proportioning raw high-alumina fly ash, burnt high-alumina fly ash, clay, dolomite, talcum, river sand and an additive, and then, carrying out uniform mixing; adding water into the mixture, and carrying out wet grinding, so as to prepare mud; and then, drying the mud to prepare a powder material, and then, carrying out crushing, so as to prepare micropowder; (2) additionally, carrying out dry-process ball-milling or airflow crushing on raw high-alumina fly ash, so as to obtain micropowder with grain size smaller than 200 meshes; and (3) uniformly mixing the micropowder obtained in the step (1) and the micropowder obtained in the step (2), discontinuously spraying an aqueous solution containing the additive into the mixture, and carrying out granulating, so as to prepare sphere blanks; and then, carrying out polishing, semifinished product screening, baking, calcining and finished product screening, thereby obtaining a finished product. According to the method, the usage amount of the fly ash can reach 90%, the fly ash replaces other aluminiferous silicon raw materials such as bauxite, and the waste is utilized, so that the resource consumption is lowered; and the obtained fly ash proppant product is excellent in performance and stable in quality.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of industrial solid waste resources, in particular to a method for preparing a low-density ceramsite proppant by using high-alumina fly ash as a raw material. Background technique [0002] Fracturing proppants are props that keep rock fractures deep in the formation open. With the large-scale exploitation of unconventional oil and gas resources such as shale oil and shale gas, high-quality fracturing proppant has become the key and core material for hydraulic fracturing to achieve good results, and the usage of high-performance proppant is rapid Increase. [0003] Oil fracturing proppant has gone through the development process of metal aluminum ball → plastic ball → glass ball → quartz sand → ceramsite proppant. At present, in the production process of ceramsite proppant, high-alumina bauxite is generally used as the main raw material, supplemented by one or more materials as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80C04B33/135C04B33/16
CPCC04B33/1352C04B33/16C04B35/14C04B35/185C04B35/6261C09K8/80Y02P40/60
Inventor 赵友谊曾华生王晋槐陈云建杜兆幸孙怀亮甘珊珊
Owner JINGANG NEW MATERIALS
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