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Method for preparing metallurgy-level aluminum oxide by using fluidized bed pulverized fuel ash

A technology of fly ash and alumina, which is applied in chemical instruments and methods, alumina/aluminum hydroxide, alumina/hydroxide preparation, etc., can solve the problem that silica components are not utilized with high added value, and the production process Complications, increased production costs, etc., achieve good iron removal effect, improve iron removal effect, and ease the pressure of iron removal

Active Publication Date: 2011-08-10
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many defects in this method: First, while extracting alumina, a large amount of silicon-calcium slag will be produced, and about 8 to 10 tons of silicon-calcium slag will be produced for every ton of alumina produced. If the building materials market cannot completely digest these silicon-calcium slags If the calcium slag is used, it will inevitably cause new and larger waste discharge, and the silicon dioxide component has not been utilized with high added value; secondly, the limestone sintering method requires high-temperature calcination, which is a high-energy-consuming method. The process and equipment The requirements are also higher; third, due to the excessive amount of slag in the alkali dissolution process, the recovery rate of alkali is reduced, resulting in an increase in cost
This method of acid-dissolving first and then alkali-dissolving complicates the production process and increases the production cost

Method used

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  • Method for preparing metallurgy-level aluminum oxide by using fluidized bed pulverized fuel ash
  • Method for preparing metallurgy-level aluminum oxide by using fluidized bed pulverized fuel ash
  • Method for preparing metallurgy-level aluminum oxide by using fluidized bed pulverized fuel ash

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Effect test

Embodiment 1

[0049] (1) Get the fluidized bed fly ash, be pulverized to 200 orders, add water and make the slurry that solid content is 33wt%, use embodiment 12 to be used for the vertical ring magnetic separator of fly ash deironing, in field strength: Magnetic separation under 15,000 GS twice, and filter cake with a solid content of 37.5wt% was obtained after filtration by a basket filter press;

[0050] (2) in filter cake, add the industrial hydrochloric acid that concentration is 28wt% to carry out acid dissolution reaction, the mol ratio of aluminum oxide in the HCl in the hydrochloric acid and the fly ash is 5: 1, 150 ℃ of reaction temperature, reaction pressure 1.0MPa, reaction time After 2h, the reaction product was filtered and washed by a basket filter press to obtain a hydrochloric acid immersion solution with a pH value of 1.5;

[0051] (3) After the hydrochloric acid immersion solution is cooled to 65°C by heat exchange, use a resin column equipped with D001 (Anhui Wandong Che...

Embodiment 2

[0057] Except step (1), other operating process conditions are all identical with embodiment 1. The operating process condition adjustment in the step (1) is:

[0058] Get the fluidized bed fly ash, crush it to 300 mesh, add water to make a slurry with a solid content of 25wt%, use the vertical ring magnetic separator for fly ash iron removal in Example 12, and the field strength is 10,000 GS Under the magnetic separation three times, obtain the filter cake that solid content is 32.0wt% after the plate basket filter press press filtration;

[0059] After determination, the chemical composition of the alumina product is shown in Table 2.

Embodiment 3

[0061] Except step (1), other operating process conditions are all identical with embodiment 1. The operating process condition adjustment in the step (1) is:

[0062] Get the fluidized bed fly ash, crush it to 150 mesh, add water to make a slurry with a solid content of 40wt%, use the vertical ring magnetic separator for fly ash iron removal in Example 12, and the field strength is 20,000 GS Under the magnetic separation twice, obtain a filter cake with a solid content of 43.0wt% after the plate basket filter press filter press;

[0063] After determination, the chemical composition of the alumina product is shown in Table 2.

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Abstract

The invention discloses a method for preparing metallurgy-level aluminum oxide by using fluidized bed pulverized fuel ash as a raw material. The method comprises the following steps of: a) grinding the pulverized fuel ash, and removing iron by a wet magnetic separation method; b) reacting the pulverized fuel ash subjected to magnetic separation with hydrochloric acid to obtain hydrochloric acid immersion liquid; c) allowing the hydrochloric acid immersion liquid to pass through a large pore type cation resin column for further iron removal to obtain refined aluminum chloride solution; d) concentrating the refined aluminum chloride solution, and crystallizing to obtain an aluminum chloride crystal; and e) calcining the aluminum chloride crystal and decomposing to obtain the metallurgy-level aluminum oxide. The method has a simple process and an easily-controlled production process, and is high in aluminum oxide extraction efficiency, low in production cost and stable in product quality.

Description

technical field [0001] The invention relates to a process for producing metallurgical-grade alumina, in particular to a process for directly producing metallurgical-grade alumina by using a circulating fluidized bed fly ash as a raw material through a combined impurity removal and one-step acid-dissolution method. Background technique [0002] Fly ash is a waste discharged from coal-fired power plants. my country is a country where coal is the main energy source. The fly ash discharged from power plants is as high as hundreds of millions of tons every year. The discharge of fly ash not only occupies a large amount of land, but also seriously pollutes the environment. How to deal with and utilize fly ash has become a very important issue. On the other hand, fly ash contains a variety of components that can be used. Studies have shown that circulating fluidized bed ash usually contains 30-50% alumina. Today, when bauxite resources are increasingly scarce, from fly ash Extracti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B09B3/00C01F7/30
CPCB09B2220/06B09B3/00C22B3/10C01F7/62C22B7/007C22B21/0023C22B7/02C22B7/005C22B3/42B09B3/0083C01F7/30C22B21/0046Y02P10/20B09B2101/30B09B3/40C01F7/22Y02W30/50C01F7/02
Inventor 郭昭华魏存弟张培萍韩建国池君洲孙延彬赵以辛
Owner CHINA SHENHUA ENERGY CO LTD
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