Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for selectively recovering germanium, bismuth and silicon from bismuth-doped silica optical fiber

A silica fiber, selective technology, applied in the preparation of germanium compounds, optics, silicon oxide, etc., can solve the problems of low recovery rate, troublesome fluoride ion treatment, high production cost, achieve high recovery rate, save reagent consumption, avoid The effect of high production costs

Active Publication Date: 2021-03-23
CENT SOUTH UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has a high leaching rate of germanium and bismuth, but this method has problems such as serious corrosion of equipment and troublesome treatment of fluorine ions.
And the subsequent recovery of bismuth requires hydrolysis, neutralization or replacement operations, and there are problems such as complex process flow, long production cycle, high material consumption and high production cost.
[0005] Patent CN109439909A adopts vulcanization and volatilization technology to enrich and separate germanium from fiber production waste containing silicon and germanium, obtain germanium sulfide or a mixture of germanium sulfide and germanium dioxide, then carry out oxidation roasting or directly carry out sulfuric acid oxidation leaching, and then use conventional method to recycle germanium, but this method has problems such as high roasting temperature, high sulfur content in smoke and environmental pollution
Patent CN110386606A adds metal salts and adjusts the pH value to carry out the silicon precipitation and germanium precipitation processes, but in this method, a large amount of germanium is also precipitated together with silicon during the silicon precipitation process, so that the recovery rate of germanium is low, and germanium resources are not fully utilized, and Introduced impurity ions

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
  • A method for selectively recovering germanium, bismuth and silicon from bismuth-doped silica optical fiber
  • A method for selectively recovering germanium, bismuth and silicon from bismuth-doped silica optical fiber
  • A method for selectively recovering germanium, bismuth and silicon from bismuth-doped silica optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The waste bismuth-doped silica optical fiber recycled by a factory is used as raw material, and its main chemical composition is shown in Table 1. By XRD analysis ( figure 2 ), the main component of waste fiber is Bi 4 (GeO 4 ) 3 , no SiO detected 2 Possibly due to SiO in spent fiber 2 It is amorphous. SEM image ( image 3 ) shows that germanium is uniformly doped in silicon.

[0045] Table 1: Chemical composition of discarded bismuth-doped silica fiber

[0046]

[0047] Such as figure 1 Shown, a kind of method that reclaims germanium, bismuth, silicon from above-mentioned bismuth-doped silica fiber, comprises the following steps:

[0048] (1) First weigh 5kg of waste optical fiber and crush and grind it until the particle size is 0.125-0.25mm. According to the mass ratio of waste optical fiber raw material and sodium hydroxide is 1:1.2, weigh 6kg of sodium hydroxide, and mix it according to the mass ratio of waste optical fiber raw material and NaCl The m...

Embodiment 2

[0059] The waste optical fiber recycled by a factory is used as raw material, and its main chemical composition is shown in Table 3.

[0060] Table 3: Chemical composition of discarded bismuth-doped silica optical fiber

[0061]

[0062] Such as figure 1 Shown, a kind of method that reclaims germanium, bismuth, silicon from above-mentioned bismuth-doped silica fiber, comprises the following steps:

[0063] (1) First weigh 5kg of waste optical fiber and crush and grind it until the particle size is 0.125-0.25mm. According to the mass ratio of waste optical fiber raw material and sodium hydroxide is 1:1.4, weigh 7kg of sodium hydroxide; The mass ratio of NaCl is 1:0.2, weigh 1kgNaCl, and mix evenly to obtain the mixture;

[0064] (2) heating the mixture obtained in step (1) to 450° C. in a muffle furnace, and then insulated for 3 hours to obtain an alkali-fused material;

[0065] (3) Add the alkali fusion material and water obtained in step (2) into water at a temperature ...

Embodiment 3

[0074] The waste optical fiber recycled by a factory is used as raw material, and its main chemical composition is shown in Table 5.

[0075] Table 5: Chemical composition of discarded bismuth-doped silica optical fiber

[0076]

[0077] Such as figure 1 Shown, a kind of method that reclaims germanium, bismuth, silicon from above-mentioned bismuth-doped silica fiber, comprises the following steps:

[0078] (1) First weigh 5kg of waste optical fiber and crush and grind it until the particle size is 0.125-0.25mm. According to the mass ratio of waste optical fiber raw material and sodium hydroxide is 1:0.7, weigh 3.5kg of sodium hydroxide and mix evenly to obtain a mixture ;

[0079] (2) heating the mixture obtained in step (1) to 250° C. in a muffle furnace, and then insulated for 3 hours to obtain an alkali-fused material;

[0080](3) Add the alkali fusion material and water obtained in step (2) into water at a temperature of 70°C at a solid-to-liquid ratio of 1:6 for lea...

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
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for selectively recycling germanium, bismuth and silicon from bismuth-doped silica fiber. The method comprises the following steps that (1) the bismuth-doped silica fiber is crushed and ground fine, and the ground bismuth-doped silica fiber is mixed with an alkaline material to obtain a mixture; (2) the mixture is heated and undergoes alkaline fusion, so that an alkaline fusion material is obtained; (3) the alkaline fusion material undergoes water immersion, solid-liquid separation is conducted, and then bismuth residues and germanium-contained liquid is obtained; (4) the bismuth residues are leached, a bismuth-contained leaching solution is obtained, and cyclone electrolysis is conducted on the bismuth-contained leaching solution, so that bismuth powder isobtained; (5) ion exchange resin is utilized to adsorb the germanium-contained liquid, germanium enrichment liquid and post-adsorption liquid are obtained, an resolution agent is utilized to conductresolution on the germanium enrichment liquid, and the germanium-contained resolution solution is obtained; and (6) a surface active agent is added to the post-adsorption liquid to conduct ageing, after filtering, drying and calcination, silicon dioxide is obtained. The method for selectively recycling the germanium, the bismuth and the silicon from the bismuth-doped silica fiber achieves selective and efficient recycling of the germanium, the bismuth and the silicon in the bismuth-doped silica fiber and has the advantages of being free of environmental pollution, simple in process, less in reagent consumption, high in comprehensive recycling degree and high in practicability.

Description

technical field [0001] The invention relates to the processing of electronic waste materials, in particular to a processing method for bismuth-doped silica optical fiber. Background technique [0002] Germanium is a typical scattered metal with good semiconducting properties. It is one of the most important metals in the modern information industry and is listed as a strategic reserve resource by countries all over the world. Germanium and its compounds are widely used in electronic industry, infrared optics, optical fiber communication, chemical catalyst and other fields. Optical fiber communication is the foundation of the information age. Adding germanium to optical fibers can greatly reduce the transmission loss of optical fibers and increase the refractive index. At present, the amount of germanium used in the germanium-doped optical fiber industry accounts for more than 30% of the total global demand for germanium. The emission spectrum of the bismuth-doped silica fib...

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): C22B41/00C22B30/06C22B7/00C25C1/22C22B3/42C01B33/12C01G17/02
CPCC01B33/12C01G17/003C01G17/02C22B3/42C22B7/001C22B7/006C22B7/007C22B30/06C22B41/00C25C1/22Y02P10/20
Inventor 田庆华李俊郭学益李栋许志鹏
Owner CENT SOUTH UNIV