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A method for extracting aluminum oxide from high-aluminum fly ash

A high-alumina fly ash and alumina technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of high cost, complicated process, low purity of alumina, etc., to achieve improved purity and large extraction capacity , strong selective effect

Inactive Publication Date: 2017-10-24
DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leaching rate of alumina in this method reaches more than 85%; however, this extraction method not only has a complicated process, but also produces alumina with low purity and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for extracting alumina using high-alumina fly ash as a raw material, comprising the following steps:

[0028] (1) Grind the fly ash and pass through a 200-mesh sieve;

[0029] (2) Mix and stir the pulverized coal ash and hydrochloric acid evenly, transfer to a hydrothermal kettle, stir and react at 120°C for 4 hours, after the reaction, filter the reaction product to obtain an eluate; wherein, the molar concentration of hydrochloric acid 1mol / L; the mass ratio of fly ash to hydrochloric acid is 1:26.08; before extraction, add concentrated hydrochloric acid to the eluate to keep the concentration of hydrochloric acid at 40g / L;

[0030] (3) Add the oxidant solution to the eluate, and stir for 45min at a stirring speed of 500r / min to obtain a mixed solution;

[0031] (4) Mix and stir methyl isobutyl ketone, tributyl phosphate, n-octanol, 2-ethylhexanol, and n-pentanol evenly, then add diluent, and continue stirring to obtain an extract; wherein, each component T...

Embodiment 2

[0036] A method for extracting alumina using high-alumina fly ash as a raw material, comprising the following steps:

[0037] (1) Grind the fly ash and pass through a 200-mesh sieve;

[0038] (2) Mix and stir the ground fly ash and hydrochloric acid evenly, transfer them to a hydrothermal kettle, and stir and react at 200°C for 0.5h. After the reaction is over, filter the reaction product to obtain an eluate; The concentration is 1.5mol / L; the mass ratio of fly ash to hydrochloric acid is 1:26.08; before extraction, add concentrated hydrochloric acid to the eluate to keep the concentration of hydrochloric acid at 50g / L;

[0039] (3) Add the oxidant solution to the eluate, and stir for 20min at a stirring speed of 800r / min to obtain a mixed solution;

[0040] (4) Mix and stir methyl isobutyl ketone, tributyl phosphate, n-octanol, 2-ethylhexanol, and n-pentanol evenly, then add diluent, and continue stirring to obtain an extract; wherein, each component The amounts in parts by...

Embodiment 3

[0045] A method for extracting alumina using high-alumina fly ash as a raw material, comprising the following steps:

[0046] (1) Grind the fly ash and pass through a 200-mesh sieve;

[0047] (2) Mix and stir the pulverized coal ash and hydrochloric acid evenly, transfer to a hydrothermal kettle, stir and react at 140°C for 5 hours, after the reaction, filter the reaction product to obtain an eluate; wherein, the molar concentration of hydrochloric acid 1.1mol / L; the mass ratio of fly ash to hydrochloric acid is 1:25.88; before extraction, add concentrated hydrochloric acid to the eluate to keep the concentration of hydrochloric acid at 42g / L;

[0048] (3) Add the oxidizing agent solution to the eluate, and stir for 40min at a stirring speed of 600r / min to obtain a mixed solution;

[0049](4) Mix and stir methyl isobutyl ketone, tributyl phosphate, n-octanol, 2-ethylhexanol, and n-pentanol evenly, then add diluent, and continue stirring to obtain an extract; wherein, each com...

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PUM

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Abstract

The invention discloses a method for extracting alumina by using high-aluminum fly ash as a raw material, which specifically comprises the following steps: firstly, the fly ash is ground and activated, and then the activated fly ash is mixed and stirred with hydrochloric acid, filtered, and dissolved Add the oxidant solution to the eluate, and stir to obtain a mixed solution; mix and stir methyl isobutyl ketone, tributyl phosphate, n-octanol, 2-ethylhexanol, and n-pentanol evenly, then add diluent, continue Stir to obtain the extract; mix the prepared mixed solution with the extract, extract, and separate the organic phase and the water phase; add concentrated ammonia water to the water phase, stir the reaction at room temperature, filter, and obtain the precipitate with deionized Wash with water for 3-5 times, dry at 80°C, and place the obtained powder in a muffle furnace for roasting to produce alumina. The purity of the alumina obtained by the method disclosed in the invention is as high as 99.9%, and the dissolution rate of the alumina is also effectively improved.

Description

Technical field: [0001] The invention relates to the field of nonferrous metal metallurgy, in particular to a method for extracting alumina by using high-alumina fly ash as a raw material. Background technique: [0002] With the massive discharge of fly ash from coal-fired power plants, a large amount of fly ash is accumulated. The discharge and accumulation of fly ash not only encroach on a large amount of land, but also cause serious pollution to soil, water resources and air, which constitutes a threat to ecology and the environment. Double destruction. However, the comprehensive utilization rate of fly ash in our country is relatively low, and the comprehensive utilization of fly ash is an important subject that our country has studied and solved for many years. At present, fly ash has been used in many fields such as construction and construction, but it is generally used extensively with low added value and low technical content. However, with the increasing demand f...

Claims

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Application Information

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IPC IPC(8): C01F7/22
CPCC01F7/22C01P2006/80
Inventor 陈东进
Owner DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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