Method for producing cryolite by using fluorine-containing waste residues of electrolytic aluminium

A technology of electrolytic aluminum and cryolite, applied in the field of aluminum metal smelting, can solve problems such as environmental pollution, failure to return electrolytic aluminum, waste of fluorine resources, etc., achieve significant economic benefits, low production costs, and solve the bottleneck of development

Active Publication Date: 2012-09-26
BAIYIN ZHONGTIAN CHEM
View PDF2 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these fluorine-containing waste residues, through simple purification treatment at present, they cannot meet the standard for returning to electrolytic aluminum, so they can only be disposed of by stacking, which not only causes environmental pollution, but also wastes fluorine resources.

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 producing cryolite by using fluorine-containing waste residues of electrolytic aluminium
  • Method for producing cryolite by using fluorine-containing waste residues of electrolytic aluminium
  • Method for producing cryolite by using fluorine-containing waste residues of electrolytic aluminium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The method that present embodiment utilizes the fluorine-containing waste residue of concentrated sulfuric acid and electrolytic aluminum to produce cryolite comprises the following steps:

[0025] (1) React fluorine-containing waste residue with 98% concentrated sulfuric acid four times its mass at a temperature of 450°C for 5 hours;

[0026] (2) The sulfur dioxide, carbon dioxide, and hydrogen fluoride gases generated during the reaction are condensed by the condenser (the boiling point of HF is 19.54°C);

[0027] (3) After the condensation is completed, the hydrogen fluoride liquid in the lower part of the condenser is absorbed by adding water to a concentration of 40% for subsequent reactions;

[0028] (4) Sulfur dioxide and carbon dioxide gas from the upper part of the condenser are separated from 90% of carbon dioxide by the dry purification equipment cyclone dust collector;

[0029] (5) Purify the sulfur dioxide gas from which carbon dioxide has been separated t...

Embodiment 2

[0034] The method that present embodiment utilizes the fluorine-containing waste residue of concentrated sulfuric acid and electrolytic aluminum to produce cryolite comprises the following steps:

[0035] (1) React fluorine-containing waste residue with 98% concentrated sulfuric acid at 250°C for 8 hours at 250°C;

[0036] (2) The sulfur dioxide, carbon dioxide, and hydrogen fluoride gases generated during the reaction are condensed by the condenser (the boiling point of HF is 19.54°C);

[0037] (3) After the condensation is completed, the hydrogen fluoride liquid in the lower part of the condenser is absorbed with washing water to a concentration of 30% for subsequent reactions;

[0038] (4) Sulfur dioxide and carbon dioxide gas from the upper part of the condenser are separated from 90% of carbon dioxide by the electrostatic precipitator of the dry purification equipment;

[0039] (5) Purify the sulfur dioxide gas from which carbon dioxide has been separated through a wet p...

Embodiment 3

[0044] The method that present embodiment utilizes the fluorine-containing waste residue of concentrated sulfuric acid and electrolytic aluminum to produce cryolite comprises the following steps:

[0045] (1) React fluorine-containing waste residue with concentrated sulfuric acid with a concentration twice the mass of 98% at a temperature of 150°C for 12 hours;

[0046] (2) The sulfur dioxide, carbon dioxide, and hydrogen fluoride gases generated during the reaction are condensed by the condenser (the boiling point of HF is 19.54°C);

[0047] (3) After the condensation is completed, the hydrogen fluoride liquid in the lower part of the condenser is absorbed with washing water to a concentration of 25% for subsequent reactions;

[0048] (4) Sulfur dioxide and carbon dioxide gas from the upper part of the condenser are separated from 90% of carbon dioxide by the dry purification equipment cyclone dust collector;

[0049] (5) Purify the sulfur dioxide gas from which carbon dioxi...

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 belongs to the technical field of aluminum industry smelting, and relates to a method for producing cryolite by using fluorine-containing waste residues of electrolytic aluminium. The technical scheme adopted by the invention is as follows: the fluorine-containing waste residues of the electrolytic aluminium and concentrated sulfuric acid are taken as raw materials to produce the cryolite. The method provided by the invention is used to improve the use ratio of the cryolite, prevent the waste of fluorine resources, and reduce the environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of aluminum metal smelting, and relates to a method for producing cryolite from electrolytic aluminum fluorine-containing waste residue. Background technique [0002] At present, the vast majority of fluoride salt products are based on fluorite (main component CaF 2 ) as raw material, the reserves of fluorspar are very limited, as an important strategic resource for the development of the atomic energy industry, all countries attach great importance to the protection of fluorspar resources, with the increasing scarcity of fluorspar resources worldwide and the rising price , leading to an inevitable trend for the inorganic fluorine chemical industry to seek other fluorine resources. [0003] Cryolite is a fluoroaluminate, also known as sodium fluoroaluminate, its molecular formula is Na 3 AIF 6 , Natural cryolite is a monoclinic prismatic crystal, colorless, due to the influence of impurities, it is often...

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): C01F7/54B09B3/00
CPCY02W30/20
Inventor 于贺华侯红军刘海霞杨华春郝建堂张圆白英刚
Owner BAIYIN ZHONGTIAN CHEM
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