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A method for preparing ceramsite proppant from bauxite beneficiation tailings

A technology of bauxite and proppant, which is applied in earth cube drilling, wellbore/well components, mining fluids, etc., can solve problems such as high management and maintenance costs, increased economic burden, and huge infrastructure investment, achieving significant economic benefits and Social benefits, good market promotion prospects, and low alumina content

Active Publication Date: 2019-09-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bauxite beneficiation tailings are usually disposed of in tailings stockpiles or solidified stockpiles. Not only is the initial infrastructure investment huge, but also the follow-up management and maintenance costs are relatively high, which increases the economic burden of the enterprise, occupies a large amount of land, and poses environmental and safety hazards.

Method used

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  • A method for preparing ceramsite proppant from bauxite beneficiation tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A bauxite beneficiation tailings in Shanxi, the weight percentage of its main chemical composition is: Al 2 o 3 : 38.16%; SiO 2 : 44.45%; Fe 2 o 3 : 2.80%; TiO 2 : 1.86%; K 2 O: 0.15%; Na 2 O: 0.05%; CaO: 0.14%; MgO: 0.12%. Using the bauxite dressing tailings as the main raw material to prepare low-density and high-strength ceramsite proppant, the main process steps are:

[0028] (1) The bauxite beneficiation tailings are subjected to iron removal by a high gradient magnetic separator, and the iron-removing product Fe is low 2 o 3 The content is 1.02%.

[0029] (2) Pre-burn the bauxite tailings after iron removal at 700°C for 3 hours, and then add aluminum phosphate as an additive for batching. The additive dosage is 4.5% of the total weight of raw materials. Less than 400 mesh (0.0374mm).

[0030] (3) Complete the granulation of the material in step (2) with a forced-stirring granulator to make semi-finished granules of 18-35 mesh (1.00mm-0.50mm);

[0031] ...

Embodiment 2

[0034]A bauxite beneficiation tailings in Henan, the weight percentage of its main chemical composition is: Al 2 o 3 : 49.80%; SiO 2 : 24.65%; Fe 2 o 3 : 4.82%; TiO 2 : 2.82%; K 2 O: 0.26%; Na 2 O: 0.16%; CaO: 0.25%; MgO: 0.14%. Using the bauxite dressing tailings as the main raw material to prepare low-density and high-strength ceramsite proppant, the main process steps are:

[0035] (1) The bauxite beneficiation tailings are subjected to iron removal by a high gradient magnetic separator, and the iron-removing product Fe is low 2 o 3 The content is 1.42%.

[0036] (2) Pre-burn the bauxite dressing tailings after iron removal at 800°C for 2 hours, then add polyaluminum chloride as an additive for batching, the additive dosage is 2.5% of the total weight of raw materials, and the fine powder after batching The powder particle size is less than 400 mesh (0.0374mm).

[0037] (3) Complete the granulation of the material in step (2) with a forced-stirring granulator to ...

Embodiment 3

[0041] A bauxite beneficiation tailings in Guizhou, the weight percentage of its main chemical composition is: Al 2 o 3 : 54.78%; SiO 2 : 22.11%; Fe 2 o 3 : 2.88%; TiO 2 : 2.75%; K 2 O: 0.38%; Na 2 O: 0.01%; CaO: 0.35%; MgO: 0.12%. Using the bauxite dressing tailings as the main raw material to prepare low-density and high-strength ceramsite proppant, the main process steps are:

[0042] (1) The bauxite beneficiation tailings are subjected to iron removal by a high gradient magnetic separator, and the iron-removing product Fe is low 2 o 3 The content is 1.22%.

[0043] (2) Pre-burn the bauxite tailings after iron removal at 900°C for 1.5 hours, then add sodium silicate as an additive for batching, the additive dosage is 0.5% of the total weight of raw materials, and the fine powder after batching The particle size is less than 400 mesh (0.0374mm).

[0044] (3) Complete the granulation of the material in step (2) with a forced-stirring granulator to make semi-finishe...

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Abstract

The invention discloses a method for preparing a ceramsite proppant from mineral processing tailings of bauxite and particularly relates to a method for preparing low-density and high-strength ceramsite proppant for oilfield downhole support by comprehensively utilizing mineral processing tailings of bauxite. The method is characterized by comprising the following preparation processes of (1) carrying out magnetic separation on the mineral processing tailings of bauxite to remove iron; (2) pre-sintering the mineral processing tailings after the iron is removed, adding an additive ingredient and crushing; (3) stirring and pelletizing the material in the step (2) to prepare a granular semi-finished product; and (4) drying and sintering the granular semi-finished product to prepare the ceramsite proppant. The method is low in production cost; and compared with the low-density and high-strength ceramsite proppant produced by adopting conventional raw materials, efficient utilization of the mineral processing tailings of bauxite can be achieved, the environment risk and the security risk in the storage process of the mineral processing tailings, the key technology for preparing the low-density and high-strength ceramsite proppant can be mastered and a technical support is provided for achievement of strategy transformation of domestic aluminum industry.

Description

technical field [0001] The invention relates to a method for preparing ceramsite proppant from bauxite dressing tailings, in particular to a method for comprehensively utilizing bauxite dressing tailings to prepare low-density and high-strength ceramsite proppants for oil field underground support. Background technique [0002] Petroleum fracturing proppant (ceramsite proppant) is made by using bauxite, kaolin, quartz and a small amount of sintering aids through batching, fine grinding and mixing, pelletizing, and finally sintering at high temperature to produce a particle size of 0.4mm to 1.2 mm spherical ceramic particles are mainly used for downhole support in oil fields to increase the production of oil and natural gas. According to the national standard, according to the bulk density of ceramsite proppant, it can be divided into high density (bulk density> 1.80g / cm 3 ), medium density (bulk density 1.66~1.80g / cm 3 ), low density (bulk density 1.45~1.66g / cm 3 ) and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80
Inventor 马俊伟吴国亮张建强郭鑫田应忠姚杰刘春玲胡秋云刘中原张站云李素敏刘晰李莎莎杨昊
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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