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

Method and system for decomposing scheelite concentrate

A technology for concentrate and scheelite, applied in the field of decomposing scheelite concentrate, can solve the problems of difficult separation of tungsten and phosphorus, reduce the decomposition cost of scheelite concentrate, and affect the quality of products by phosphorus, and achieve easy industrial-scale production and operation. The effect of strong performance, simple process and equipment

Active Publication Date: 2016-09-07
GANZHOU NONFERROUS METALLURGICAL RES INST
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method and system for decomposing scheelite concentrate, so as to overcome the problem that tungsten and phosphorus are difficult to separate in the traditional acid decomposition process, and phosphorus is easy to affect the quality of the product; phosphorus-free oxalic acid is used instead of sulfur and phosphorus Mixed acid, the oxalate in oxalic acid can form a complex with tungsten, and at the same time, oxalic acid and calcium combine to form calcium oxalate which is insoluble in water, and calcium oxalate can be treated with sulfuric acid to obtain oxalic acid and calcium sulfate; it can completely decompose scheelite concentrate The tungsten and oxalic acid in it can be regenerated and recycled; it can significantly reduce the decomposition cost of scheelite concentrate, simplify the decomposition equipment and facilitate operation

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 and system for decomposing scheelite concentrate
  • Method and system for decomposing scheelite concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Decompose scheelite concentrate with oxalic acid, decompose 10.0kg scheelite concentrate in a 50L reactor, the WO of scheelite concentrate 3 The content is 25%, the amount of oxalic acid added is 5.0kg, the decomposition temperature is 25°C, the reaction time is 14h, and the decomposition rate of tungsten in scheelite concentrate reaches 99.21%. The tungsten concentration in the filtered decomposition solution (tungsten oxalate solution) is 24.18g / L, the Ca concentration is 3.12g / L, the Zn concentration is 3.93g / L, the Mg concentration is 4.34g / L, and the Fe concentration is 4.50g / L , after extraction with N1923, the extraction rate of tungsten reaches 99.51%. After the loaded organic phase is back-extracted with ammonium chloride, the obtained ammonium tungstate solution can be evaporated and crystallized to obtain APT zero-grade product. After the decomposed slag is treated with sulfuric acid, the concentration of sulfuric acid is 2mol / L, and the treatment ...

Embodiment 2

[0026] Embodiment 2: oxalic acid decomposes scheelite concentrate, decomposes 10.0kg scheelite concentrate in 50L reactor, the WO of scheelite concentrate 3 The content is 45%, the amount of oxalic acid added is 8.0kg, the decomposition temperature is 55°C, the reaction time is 10h, and the decomposition rate of tungsten in scheelite concentrate reaches 99.54%. The tungsten concentration in the filtered decomposition liquid (tungsten oxalate solution) is 43.52g / L, the Ca concentration is 1.92g / L, the Zn concentration is 2.31g / L, the Mg concentration is 2.44g / L, and the Fe concentration is 2.68g / L After extraction with N1923, the extraction rate of tungsten reaches 99.55%. After the loaded organic phase is back-extracted with ammonium chloride, the obtained ammonium tungstate solution can be evaporated and crystallized to obtain APT zero-grade products. After the decomposed slag is treated with sulfuric acid, the concentration of sulfuric acid is 1mol / L, and the treatment time ...

Embodiment 3

[0027] Embodiment 3: oxalic acid decomposes scheelite concentrate, decomposes 10.0kg scheelite concentrate in 50L reactor, the WO of scheelite concentrate 3 The content is 50%, the amount of oxalic acid added is 9.0kg, the decomposition temperature is 55°C, the reaction time is 10h, and the decomposition rate of tungsten in scheelite concentrate reaches 99.54%. The tungsten concentration in the filtered decomposition solution (tungsten oxalate solution) is 48.36g / L, the Ca concentration is 2.10g / L, the Zn concentration is 2.61g / L, the Mg concentration is 2.94g / L, and the Fe concentration is 3.11g / L , after extraction with N1923, the extraction rate of tungsten reaches 99.57%. After the loaded organic phase is back-extracted with ammonium chloride, the obtained ammonium tungstate solution can be evaporated and crystallized to obtain APT zero-grade products. After the decomposed slag is treated with sulfuric acid, the concentration of sulfuric acid is 3mol / L, and the treatment t...

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 decomposing scheelite concentrate. The scheelite concentrate is decomposed through oxalic acid, and decomposing liquid and decomposing slag are obtained through filtration; the decomposing liquid is subjected to extraction, reverse extraction and evaporative crystallization, and APT products are obtained; and the decomposing slag is treated through sulfuric acid, regenerated oxalic acid is obtained, and the regenerated oxalic acid can return to decompose the scheelite concentrate and can be repeatedly used. According to the method, the oxalic acid is adopted to directly decompose the scheelite concentrate under the normal pressure condition, and the decomposing rate of tungsten trioxide in the scheelite concentrate can reach 99% or above; and after the decomposing liquid is subjected to extraction, the tungsten extraction rate can reach 99% or above, and the zero-level APT products can be obtained in the whole process. By means of the method, the scheelite concentrate decomposing cost can be remarkably reduced, decomposing equipment is simplified, and operation is convenient.

Description

technical field [0001] The invention relates to a method for decomposing scheelite concentrate, belonging to the technical field of hydrometallurgy. Background technique [0002] The traditional acid method to decompose scheelite concentrate is generally decomposed by hydrochloric acid, and calcium chloride solution and tungstic acid precipitation are obtained after decomposition; after tungstic acid precipitation is washed, ammonium tungstate solution is obtained through ammonia dissolution. However, this method is only suitable for processing low-impurity scheelite concentrate, and the operating environment is poor, and the equipment is highly corrosive. This method has been basically eliminated as the main process. [0003] For a long time, my country's tungsten concentrate mining has been dominated by black tungsten ore resources, and the output once accounted for more than 90% of the output of wolframite concentrate. At present, the reserves of wolframite ore have been ...

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
IPC IPC(8): C22B3/16C22B3/02C22B34/36
CPCC22B3/02C22B3/165C22B34/36Y02P10/20
Inventor 陈冬英许亮杨新华赖兰萍陈后兴彭少华周洁英洪侃李忠岐温祥张选旭陈淑梅伍莺
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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