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

Method for removing various organic compounds in sodium aluminate solution in aluminum oxide production

A technology of organic compounds and alumina, which is applied to the preparation of aluminum compounds, alkali metal aluminates/aluminum oxide/aluminum hydroxide, chemical instruments and methods, etc. It can solve problems such as poor removal effect, large expenditure, and difficult operation , to achieve the effect of low cost, small investment and simple connection

Pending Publication Date: 2022-07-12
广西田东锦鑫化工有限公司
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as pointed out in U.S. Patent No. 3,832,442 (Emerson), the purification problem of Bayer liquor treated in this way will be due to the large amount of treatment agent and the need to use a plurality of filtration stages to remove particulate matter, adsorbent and impurities adhering to it. The above-mentioned purification method will cause obvious operational difficulties and require a large amount of money
In addition, the above-mentioned purification method is not effective in removing many organic substances in Bayer liquor

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 removing various organic compounds in sodium aluminate solution in aluminum oxide production
  • Method for removing various organic compounds in sodium aluminate solution in aluminum oxide production
  • Method for removing various organic compounds in sodium aluminate solution in aluminum oxide production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The method for removing various organic compounds in sodium aluminate solution in alumina production includes the following steps: adding coal ash into Bayer solution, mixing uniformly, and reacting at a temperature of 50°C for 6 hours, then filtering, The filtrate is sent back to the evaporator of the alumina production system for evaporation and concentration, and then transferred to the dissolution process for recycling; the filter cake is a coal ash filter cake with organic matter with low moisture content, and is directly sent to the coal-fired boilers of the power plant for other coal-fired devices. Fuel utilization, safety and environmental protection;

[0039] It is stated that the Bayer solution is the sodium aluminate solution obtained after precipitating aluminum hydroxide through the decomposition tank in the alumina production system;

[0040] It is said that the coal ash is the by-product ash powder produced by the gas generator;

[0041] The added amount...

Embodiment 2

[0043] A method for removing various organic compounds in a sodium aluminate solution in alumina production, comprising the following steps: firstly pre-treating the coal ash with nitric acid before use, specifically adding nitric acid to the coal ash to mix evenly, and then filtering The pretreated coal ash can be obtained by drying; the concentration of nitric acid is 0.1 mol / L, and the solid content of the feed liquid obtained by pretreatment is 200 g / L; the pretreated coal ash is added to the Bayer solution and mixed evenly Then, under the condition of temperature of 50 °C, after standing for 6 hours, the filtrate was filtered, and the filtrate was sent back to the evaporator of the alumina production system for evaporation and concentration, and then transferred to the dissolution process for recycling; the filter cake was coal ash with organic matter. The filter cake, with low moisture content, can be directly sent to the coal-fired boilers of power plants and other coal-...

Embodiment 3

[0048] A method for removing various organic compounds in a sodium aluminate solution in alumina production, comprising the following steps: firstly pre-treating the coal ash with nitric acid before use, specifically adding nitric acid to the coal ash to mix evenly, and then filtering The pretreated coal ash can be obtained by drying; the concentration of nitric acid is 0.1 mol / L, and the solid content of the feed liquid obtained by pretreatment is 200 g / L; the pretreated coal ash is added to the Bayer solution and mixed evenly Then, 50ppm of diallyl dimethyl ammonium chloride was added, and after mixing, the reaction was allowed to stand for 6 hours at a temperature of 50 °C, and then filtered, and the filtrate was returned to the alumina production system for recycling. The filter cake was used as The fuel is sent to other coal-fired devices in the power plant;

[0049] It is stated that the Bayer solution is the sodium aluminate solution obtained after precipitating aluminu...

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
densityaaaaaaaaaa
iodine adsorption valueaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for removing various organic compounds in a sodium aluminate solution in aluminum oxide production, and belongs to the technical field of aluminum oxide production. The method comprises the following steps: adding coal ash into Bayer liquid, uniformly mixing, standing and reacting for 4-8 hours at the temperature of 45-65 DEG C, filtering, returning filtrate to an aluminum oxide production system for recycling, and feeding a filter cake as fuel to other coal burning devices of a power plant; the Bayer liquid is a sodium aluminate solution obtained by separating after aluminum hydroxide is precipitated in a decomposing tank in an aluminum oxide production system; the coal ash is by-product ash powder produced by the gas producer. The method can be used for effectively removing various organic compounds in the sodium aluminate solution in aluminum oxide production, and has the characteristics of simplicity in operation, low operation cost and the like.

Description

technical field [0001] The invention belongs to the technical field of alumina production, in particular to a method for removing various organic compounds in sodium aluminate solution in alumina production. Background technique [0002] The process used to prepare alumina from bauxite is the Bayer method, that is, using a certain concentration of sodium hydroxide solution, the bauxite is dissolved out at a certain temperature to obtain a sodium aluminate solution, which is then diluted, cooled and added with hydroxide The aluminum seed crystal is obtained by the precipitation method in the decomposition tank to obtain aluminum hydroxide, and then aluminum oxide is calcined. The sodium aluminate solution obtained after precipitating aluminum hydroxide in the decomposition tank is evaporated and concentrated by the evaporator and returned to the dissolution process for recycling. [0003] Bauxite is distributed all over the world, and the amount of bauxite in different places...

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): C01F7/473C01F7/14
CPCC01F7/473C01F7/14
Inventor 皮溅清赵志强王明理黄桂华莫欣达
Owner 广西田东锦鑫化工有限公司
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