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A method of extracting aluminum from fly ash

A fly ash and activator technology, which is applied in the field of extracting aluminum from fly ash, can solve the problems of impure aluminum extraction, post-processing, high energy consumption, and difficulties, and achieve reduced production costs, low energy consumption, and dissolution rate high effect

Active Publication Date: 2017-03-01
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, some of these methods have a large demand for heat and consume more energy, and some will bring in new elements or pollutants, resulting in impurity in the extraction of aluminum or difficulties in post-processing. Therefore, how to effectively activate fly ash and Improving the extraction rate of aluminum becomes crucial

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The chemical composition in the fly ash that the present invention adopts consists of:

[0021] SiO2 53.17%;

[0022] Al2O3 24.62%;

[0023] Fe2O3 10.68%;

[0024] CaO 4.01%;

[0025] MgO 2.14%;

[0026] SO3 0.13%;

[0027] The rest is loss on ignition.

[0028] A method for extracting aluminum from fly ash, characterized in that it comprises the following steps:

[0029] (1) Maturing: Grind the fly ash to a fineness of 200-300 mesh, add activator and water, stir evenly, put it into the maturing tank and stack it for 2 days for high-temperature maturation;

[0030] (2) Wet roasting: stirring and leaching the clinker at normal temperature and pressure, heating at 700°C until the water is dry, sending it into a muffle furnace, and roasting at 1000°C for 46 minutes;

[0031] (3) Acidification roasting: cooling the above-mentioned roasting material to normal temperature, adding sulfuric acid with a concentration of 95%, stirring evenly, heating and roasting at 270° C...

Embodiment 2

[0039] A method for extracting aluminum from fly ash, characterized in that it comprises the following steps:

[0040] (1) Ripening: Grind the fly ash to a fineness of 200 mesh, add activator and water, stir evenly, put it into the ripening tank and stack it for 2 days for high-temperature ripening;

[0041] (2) Wet roasting: stirring and leaching the clinker at normal temperature and pressure, heating at 630°C until the water is dry, sending it into a muffle furnace, and roasting at 950°C for 47 minutes;

[0042] (3) Acidification roasting: cooling the above-mentioned roasting material to normal temperature, adding sulfuric acid with a concentration of 95%, stirring evenly, heating and roasting at 300° C. for 36 minutes;

[0043] (4) Evaporation and crystallization: filter the above-mentioned roasting material, evaporate the filtrate, and when its density is 1.30, stop evaporation, and crystallize and separate out aluminum sulfate;

[0044] (5) Extracting aluminum hydroxide:...

Embodiment 3

[0051] A method for extracting aluminum from fly ash, characterized in that it comprises the following steps:

[0052] (1) Maturing: Grind the fly ash to a fineness of 200-300 mesh, add activator and water, stir evenly, put it into the maturing tank and stack it for 2 days for high-temperature maturation;

[0053] (2) Wet roasting: stirring and leaching the clinker at normal temperature and pressure, heating at 630°C until the water is dry, sending it into a muffle furnace, and roasting at 970°C for 41 minutes;

[0054] (3) Acidification roasting: cooling the above-mentioned roasting material to normal temperature, adding sulfuric acid with a concentration of 95%, stirring evenly, heating and roasting at 280° C. for 37 minutes;

[0055] (4) Evaporation and crystallization: filter the above-mentioned roasting material, evaporate the filtrate, and when its density is 1.25, stop evaporation, and crystallize and separate out aluminum sulfate;

[0056] (5) Extracting aluminum hydr...

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PUM

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Abstract

The invention discloses a method for extracting aluminum from fly ash, which comprises the following steps: slaking, wet-process roasting, acidification roasting, evaporative crystallization, aluminum hydroxide extraction, aluminum oxide preparation and fusion electrolysis. Most traditional methods for activating fly ash adopt mixed roasting and have higher energy consumption. According to the method, the fly ash is firstly activated in a liquid activator and then roasted, thereby achieving the activation effect at lower temperature within a short time. The liquid activator is free of any toxic substance, and the added elements can not influence the purity of the aluminum. The method has the advantages of low energy consumption, high aluminum leaching rate, no harmful waste liquor generated in the process, lower production cost, high safety and environment friendliness, and is suitable for industrial production.

Description

technical field [0001] The invention mainly relates to the field of extracting aluminum, in particular to a method for extracting aluminum from fly ash. Background technique [0002] Fly ash is a solid waste from coal-fired power plants. At present, the total storage of fly ash in my country has exceeded 1 billion tons, and now it is increasing at a rate of 80 million tons per year, while the utilization of fly ash is less than 50%. The stockpiling of fly ash not only occupies a large amount of land, pollutes the environment, but also endangers organisms and human health. Moreover, many useful components in fly ash cannot be rationally utilized, resulting in waste of resources. [0003] Fly ash contains 39.04% alumina and 3.30% iron oxide, from which Al2O3 with high economic value can be extracted and used as a new aluminum resource, which will help reduce the pressure on aluminum demand. It is also an effective way to improve the comprehensive utilization value of fly ash...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B21/00C25C3/06
CPCY02P10/20
Inventor 孙玉壮张海岛王金喜高康林明月孟志强
Owner HEBEI UNIV OF ENG
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