Method for extracting alumina from fly ash based on ammonium sulfate method

A technology of ammonium sulfate method and fly ash, applied in the direction of alumina/hydroxide preparation, energy input, etc., can solve the problems of shortening the main process process chain, high energy consumption, high corrosion, etc., and achieve environmental protection and energy efficiency Low consumption, less corrosive effect

Active Publication Date: 2015-08-26
CHINA SHENHUA ENERGY CO LTD +2
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for extracting alumina from fly ash based on the ammonium sulfate method, which effectively overcomes the problems of high corrosion (such as: acid process) and high energy consumption (such as: sintering method) in the prior art. And change the order of impurity removal in the process, shorten the process chain of the overall main process, and solve the technical problems of material melting, sticking to the wall, agglomeration or ring formation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for extracting alumina from fly ash based on ammonium sulfate method
  • Method for extracting alumina from fly ash based on ammonium sulfate method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] The method for extracting alumina from fly ash based on the ammonium sulfate method is characterized in that:

[0123] Achieved by the following steps:

[0124] Step 1: According to the molar ratio of fly ash and ammonium sulfate of 1:5, add ammonium sulfate to the fly ash; then add proppant according to the ratio of fly ash to proppant of 1:0.05; mix Granulation, the particle size of spherical mixed particles is 0.5-10mm in diameter;

[0125] The proppant is composed of two components mixed in a mass ratio of 1:0.5. The first component is selected from cement and yellow mud, and the second component is selected from sulfate (selected from sodium sulfate, potassium sulfate, ammonium sulfate, etc.);

[0126] Step 2: Roast the particles in a two-stage fluidized roasting system:

[0127] A. Low-temperature drying and roasting of granulation:

[0128] The low-temperature drying system is used to dry and roast the granulation at a low temperature. The roasting temperatur...

Embodiment 2

[0152] Step 1: According to the molar ratio of fly ash and ammonium sulfate as 1:7, add ammonium sulfate to the fly ash; then add proppant according to the ratio of fly ash to proppant as 1:15; mix Granulation, the particle size of spherical mixed particles is 0.5-10mm in diameter;

[0153] The proppant is formed by mixing two components at a mass ratio of 1:1, component one is selected from water glass and bentonite, and component two is roasted clinker of ammonium sulfate and fly ash;

[0154] Step 2: Roast the particles in a two-stage fluidized roasting system:

[0155] A. Low-temperature drying and roasting of granulation:

[0156] Using a low-temperature drying system, the granulation is dried and roasted at a low temperature. The roasting temperature is 110°C and the roasting time is 10 minutes to remove free water on the surface of the granules;

[0157] In the low-temperature drying system, the bottom of the low-temperature roasting fluidized bed body is connected to...

Embodiment 3

[0180] Step 1: According to the molar ratio of fly ash and ammonium sulfate as 1:9, add ammonium sulfate to the fly ash; then add proppant according to the ratio of fly ash to proppant as 1:25; mix Granulation, the particle size of spherical mixed particles is 0.5-10mm in diameter;

[0181] The proppant is composed of two components mixed in a mass ratio of 1:1.5, component one is selected from phosphate (chosen from sodium phosphate, potassium phosphate, ammonium phosphate, etc.), aluminum ammonium sulfate, and the component Divided into one of the silicon slag;

[0182] Step 2: Roast the particles in a two-stage fluidized roasting system:

[0183] A. Low-temperature drying and roasting of granulation:

[0184] Using a low-temperature drying system, the granulation is dried and roasted at a low temperature. The roasting temperature is 160°C and the roasting time is 20 minutes to remove free water on the surface of the granules;

[0185] In the low-temperature drying system...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for extracting alumina from fly ash based on an ammonium sulfate method. The prior art utilizing fluidized bed-based roasting activation of fly ash to realize alumina extraction produces the problems of material caking and adhesion to the wall so that industrialization is realized difficultly and crude alumina produced by the prior art needs resolution impurity-removal so that processes are more, efficiency is low and energy consumption is high. The method comprises that fly ash, ammonium sulfate and a propping agent are mixed, the mixture is subjected to granulation, the granules are subjected to two-section fluidized bed roasting, the clinker is heated and dissolved by water, the filtrate is subjected to combined impurity-removal and then ammonia precipitation crystallization, and the crystals are calcined to form alumina. The method utilizes mixing granulation of fly ash, ammonium sulfate and the propping agent, oxygen-rich two-section fluidized bed roasting and heating dissolution by water, changes the order of the impurity-removal processes, utilizes a technical scheme comprising impurity-removal and then ammonia precipitation crystallization for high-purity aluminum hydroxide production to solve the problems of equipment corrosion, roasting-caused adhesion to the wall, clustering and coking of the prior art, shortens the integral main process and greatly reduces energy consumption and a cost of extraction of alumina from fly ash.

Description

Technical field [0001] The invention involves a method of alumina extraction, which specifically involves a method of extracting alumina for ammonium sulfate -based method from the ash. Background technique [0002] Thermal power generation occupies a dominant position in my country's power generation structure, and coal -fired thermal power generation occupies an absolute proportion in thermal power generation. Humry ash is a solid waste discharged by coal -fired power plants. [0003] In recent years, with the development of the power industry, the emissions of flour ash have increased sharply. According to the report of the China Coal Industry Association in January 2009, the total coal production in my country in 2008 was 2.716 billion tons, most of which were used for power generation. The annual emissions of my country's flour ash have exceeded 200 million tons, and the cumulative stacking volume exceeds 2.5 billion tons, occupying a large amount of cultivated land and poll...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30
CPCY02P20/129
Inventor 曾伟郭新锋梁兴国钱永康郭坤杨超高旋王辉李宁王会宁刘胜丁建亮
Owner CHINA SHENHUA ENERGY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap