Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Desiliconized fly ash and preparation method and application thereof

A technology for fly ash and high-alumina fly ash, which is applied in alumina/aluminum hydroxide and other directions, can solve the problems of low desiliconization efficiency, large alumina circulation volume, and high equipment requirements, and is convenient for large-scale promotion and application. , Reduce the cost of equipment use, the effect of mild implementation conditions

Active Publication Date: 2017-06-30
DATANG INT HIGH ALUMINA COAL R & D CENT
View PDF8 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing pre-desiliconization technology adopts the method of desiliconization with lye under high pressure, which not only has the disadvantages of high pressure, high energy consumption, and high equipment requirements, but also can only increase the aluminum-silicon ratio of desiliconized fly ash to 2.0 or so, the desiliconization efficiency is low, causing problems such as large circulation volume, large amount of slag, and high lime consumption in subsequent alumina production

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
  • Desiliconized fly ash and preparation method and application thereof
  • Desiliconized fly ash and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] like figure 1 As shown, the preparation method of the desiliconized fly ash provided in this embodiment comprises the following steps:

[0030] Mix 100g of high-alumina fly ash (alumina content of 48.21wt%, silica content of 39.22wt%, aluminum-silicon ratio of 1.23) and 280mL of sodium hydroxide solution (concentration of 12wt%) in a normal pressure reactor React in medium for about 1 hour, control the reaction temperature to maintain at about 85°C, vacuum filter after the reaction is completed, and obtain the primary desiliconization liquid in the liquid phase and the primary filter cake in the solid phase, and wash the primary filter cake at a temperature of about 105°C Under drying, the aluminum-silicon ratio of the primary filter cake was measured to be 2.19;

[0031] The primary filter cake was slurried with sulfuric acid solution, according to the liquid-solid mass ratio of 4, the temperature was 90°C, the sulfuric acid concentration was 13.5wt%, and after slurry...

Embodiment 2

[0034] like figure 1 As shown, the preparation method of the desiliconized fly ash provided in this embodiment comprises the following steps:

[0035] Mix 100g of high-alumina fly ash (alumina content of 48.21wt%, silica content of 39.22wt%, and aluminum-silicon ratio of 1.23) with 300mL of sodium hydroxide solution (concentration of 10wt%) in an atmospheric pressure reactor React in medium for about 1 hour, control the reaction temperature to maintain at about 95°C, carry out vacuum filtration after the reaction is completed, and obtain the primary desiliconization liquid in the liquid phase and the primary filter cake in the solid phase, and wash the primary filter cake at a temperature of about 105°C Under drying, the aluminum-silicon ratio of the primary filter cake was measured to be 2.22;

[0036] The primary filter cake was slurried with sulfuric acid solution, according to the liquid-solid mass ratio of 5, the temperature was 95 ° C, and the sulfuric acid concentratio...

Embodiment 3

[0039] like figure 1 As shown, the preparation method of the desiliconized fly ash provided in this embodiment comprises the following steps:

[0040] Mix 100g of high-alumina fly ash (alumina content of 48.21wt%, silica content of 39.22wt%, aluminum-silicon ratio of 1.23) with 300mL of sodium hydroxide solution (concentration of 13.5wt%) and react at normal pressure React in the container for about 2 hours, control the reaction temperature to maintain at about 94°C, and vacuum filter after the reaction is completed to obtain the primary desiliconization liquid in the liquid phase and the primary filter cake in the solid phase, and wash the primary filter cake at about 105°C Drying at high temperature, the aluminum-silicon ratio of the primary filter cake was measured to be 2.21;

[0041] The primary filter cake was slurried with hydrochloric acid solution, according to the liquid-solid mass ratio of 3.5, the temperature was 92°C, and the concentration of hydrochloric acid wa...

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

No PUM Login to View More

Abstract

The invention provides desiliconized fly ash and a preparation method and application thereof. The preparation method of the desiliconized fly ash comprises the following steps: 1) mixing high-alumina fly ash and first alkali lye and then carrying out primary normal-pressure silicon removal, and carrying out liquid-solid separation to obtain a first desiliconized liquid and a first filter cake; 2) washing and starching the first filter cake with an acid solution, and carrying out liquid-solid separation on the washing and starching product to obtain an acid-pickling filter cake and an acid-pickling filtrate; and 3) mixing the acid-pickling filter cake and second alkali lye and then carrying out secondary normal-pressure silicon removal, and carrying out liquid-solid separation to obtain a second desiliconized liquid and desiliconized fly ash. According to the above preparation method of desiliconized fly ash, high-alumina fly ash is used as the raw material, and a two-stage normal-pressure silicon removal and acid-pickling combined mild wet method is adopted for silicon removal. Thus, reaction pressure is decreased, cost of investment in equipment is reduced, desiliconization efficiency and alumina-silica ratio of desiliconized fly ash are increased, and it is beneficial to subsequent extraction of alumina.

Description

technical field [0001] The invention relates to high-tech resource utilization of high-alumina fly ash, in particular to a desiliconized fly ash and its preparation method and application. Background technique [0002] According to the data in the "Twelfth Five-Year Plan" comprehensive utilization of bulk solid waste, my country's fly ash output reached 620 million tons in 2015, ranking first in the world. Fly ash stockpiles have problems such as occupying land, polluting air, and polluting water sources. In addition, as my country's bauxite is becoming increasingly poor, the degree of dependence on foreign countries has reached more than 50%. With the tightening of mineral export policies in Indonesia and other countries, the raw material supply situation of my country's aluminum industry has become more severe. Therefore, the research and development of new technologies for efficient co-extraction of fly ash, aluminum and silicon resources is not only a necessary measure f...

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 Applications(China)
IPC IPC(8): C01F7/02
CPCC01F7/02
Inventor 公彦兵孙俊民高志军洪景南许学斌王娜李运改
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com