Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for recovering germanium in lignite smoke

A soot and lignite technology, which is applied in the field of resource utilization and industrial waste treatment, can solve the problems of long reaction time, waste acid generation, complicated process, etc., and achieve the effect of long reaction time, low recovery rate and clean treatment process

Inactive Publication Date: 2015-09-16
SHANGHAI JIAO TONG UNIV
View PDF9 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It adopts complete hydrometallurgical technology, the reaction time is long, the process is complicated, waste acid is produced, and waste water is more

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 recovering germanium in lignite smoke
  • Method for recovering germanium in lignite smoke
  • Method for recovering germanium in lignite smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First place lignite dust and 5wt% coke in a vacuum furnace, then maintain the vacuum in the furnace below 0.1Pa, and keep the temperature at 1000°C, heat for 40 minutes to make it fully react, and the tail gas generated during the vacuum reduction process Pass through the gas discharge channel, and discharge after purification treatment; vacuum reduction reaction obtains germanium metal and its oxide with a recovery rate of 95.30%. Then through the chlorination distillation process, the chloride GeCl of germanium is obtained 4 , followed by hydrolysis and H 2 After reduction treatment, metallic germanium with a purity of more than 90% is obtained.

Embodiment 2

[0048] First place lignite dust and 15wt% coke in a vacuum furnace, then maintain the vacuum in the furnace below 10Pa, and keep the temperature at 1200°C for 40 minutes to fully react, and the tail gas generated during the vacuum reduction process passes through The gas is discharged from the channel and discharged after purification treatment; the vacuum reduction reaction obtains germanium metal and its oxide with a recovery rate of 96.48%. Then through the chlorination distillation process, the chloride GeCl of germanium is obtained 4 , followed by hydrolysis and H 2 After reduction treatment, metallic germanium with a purity of more than 90% is obtained.

Embodiment 3

[0050] First place lignite dust and 25wt% coke in a vacuum furnace, then maintain the vacuum in the furnace below 0.01Pa, and keep the temperature at 900°C, heat for 60 minutes to make it fully react, and the tail gas generated during the vacuum reduction process Pass through the gas discharge channel and discharge after purification treatment; the vacuum reduction reaction obtains germanium metal and its oxide with a recovery rate of 90.12%. Then through the chlorination distillation process, the chloride GeCl of germanium is obtained 4 , followed by hydrolysis and H 2 After reduction treatment, metallic germanium with a purity of more than 90% is obtained.

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 discloses a method for recovering germanium in lignite smoke by virtue of a vacuum reduction-chlorination distillation technology. The method comprises the following steps: firstly, placing the lignite smoke and 5-25wt% of coke in a vacuum heating furnace, and carrying out a vacuum reduction reaction at 800-1000 DEG C to obtain a product containing metal Ge, GeO and some impurities, for example, the condensation product of As2O3; secondly, carrying out chlorination distillation on the condensation product to obtain pure GeCl4 with a purity of more than 90%; thirdly, carrying out a hydrolysis reaction on GeCl4 to obtain pure GeO2; finally, carrying out the reaction of reducing the pure GeO2 by H2 to obtain metal Ge with a purity of more than 90%. The method achieves the recovery rates of 90% or above respectively, has the characteristics of being efficient, environment-friendly and high in recycling degree, and is suitable for large-scale industrialized applications.

Description

technical field [0001] The invention relates to a method for recovering germanium in lignite dust by using vacuum reduction-chlorination distillation technology, which is an environmentally friendly and efficient method for recovering germanium in lignite dust. The invention belongs to the field of industrial waste treatment and recycling in the technical field of environmental protection. Background technique [0002] Germanium, as a rare metal, has been widely used in semiconductor, electronic and optical devices. Many countries also regard germanium as a strategic reserve metal. According to the distribution of germanium application fields, the global use of germanium is mainly in optical fiber, infrared equipment and chemical catalysts, accounting for 30%, 22% and 34% respectively. However, as the use of germanium continues to increase, germanium resources are very scarce worldwide. The global germanium reserves are only 8,600 tons, which is only 1 / 10 of the gold rese...

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): C22B7/02C22B41/00
CPCY02P10/20
Inventor 许振明张灵恩
Owner SHANGHAI JIAO TONG UNIV
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
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