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

Method for recovering scandium from titanium dioxide wastewater on large scale

A technology for titanium white wastewater and wastewater, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve problems such as inability to store, poor separation, and small processing capacity, and achieve guaranteed purity, high purity, and processing capacity big effect

Active Publication Date: 2012-10-03
河南荣佳钪钒科技有限公司
View PDF1 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the enrichment stage, the process used mainly uses P204 as the extraction agent, which has disadvantages such as poor separation of scandium and other impurities, and difficulty in stripping. In addition, although P507 and P204 are both acid extraction agents, due to the late launch of P507 products , the price is high, no one has systematically studied the benefits of replacing P204 with P507 before, so those skilled in the art have long used P204 as the extraction agent for scandium recovery
At present, the output of titanium dioxide factory has expanded 100 times compared with 10 years ago. A factory with 100,000 tons / year has a daily wastewater discharge of 1000-1200m 3 , such a large amount of wastewater cannot be stored, and for a long time, the use of plastic extraction tanks or enamel reaction kettles in large-scale scandium extraction technology has the problems of small processing capacity and low efficiency. Therefore, choosing appropriate processing equipment has become a large-scale The top priority of chemical extraction of scandium

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 scandium from titanium dioxide wastewater on large scale
  • Method for recovering scandium from titanium dioxide wastewater on large scale
  • Method for recovering scandium from titanium dioxide wastewater on large scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Pipeline mixer ￠260×1.5mm, with CML-550 centrifugal extractor, flux 50m 3 / h, waste acid is 5molH 2 SO 4 , including Sc 2 o 3 12mg. / L, TiO 2 6g / L, the extraction agent is 15%P507+kerosene, the ratio is O / A=1 / 15, the extraction time is 6 seconds, the extraction rate of scandium is 95%, and the organic phase content in the aqueous phase is less than 100mg / L, discharge. Load organic phase with 5mol / L H 2 SO 4 + 1%H 2 o 2 Mixed liquid washing, compared with O / A=1 / 2, 15 grades, titanium removal rate> 85%, after washing the organic phase, use 3mol / L NaOH as stripping agent, compared with O / A=2 / 1, The temperature is 70°C, the stripping rate of scandium is >98%, and the organic phase is back-extracted with alkali, and then 1mol / L H 2 SO 4 Washing treatment, return to the extraction section, after the stripping precipitate is filtered, use 6mol / L HNO 3 Dissolve, and add 1% tartaric acid to adjust the acidity, filter the solution and add oxalic acid to precipitate scan...

Embodiment 2

[0032] Pipeline mixer ￠230×1.2mm, with CML-550 centrifugal extractor, flux 30m 3 / h, the extractant is 40%P507+kerosene, the ratio is O / A=1 / 50, the extraction time is 10 seconds, the scandium extraction rate is 98%, and the organic phase is loaded with 2mol / L H 2 SO 4 + 4%H 2 o 2 Washing, compared to O / A=2 / 1, 10 levels. The stripping organic phase is 5mol / L NaoH, O / A=1 / 3, the temperature is 50°C, and the scandium stripping rate is 99%. Dissolve the alkali cake with 2mol / L HCl, adjust the acidity, add 1% EDTA, stir and filter, the filtrate is precipitated with oxalic acid, and the scandium oxalate is burned at 700°C for 4 hours to obtain 98% scandium oxide.

Embodiment 3

[0033] Example 3 The comparative experimental results of P507 and P204 extraction

[0034] Extraction conditions: 25% P204+kerosene and 25% P507+kerosene, O / A=1 / 20, t=20 minutes, separatory funnel

[0035] Stripping conditions: 2N NaOH, O / A=1 / 2,

[0036] Table 1 Substance content in feed liquid

[0037]

[0038] Table 2 Analysis of organic phase after extraction (unit: g / L)

[0039]

[0040] Table 3 Comparison of extraction rates of P204 and P507

[0041]

[0042] Table 4 Analysis of organic phase extraction rate after extraction

[0043]

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 scandium from titanium dioxide wastewater on a large scale. According to the method, a centrifugal extractor is matched with a pipeline mixer for use; and P507 is used as an extracting agent. The method has the advantages of short time, high treatment amount, small occupied area and realization of oil-water separation. An organic phase is washed by using a H2O2 and sulfuric acid mixed solution, so that the amount of an alkali reaction substance is greatly reduced, and further acid is dissolved, most impurities are removed and the treatment amount of subsequent-stage work procedures is reduced. According to the method, scandium oxide with the purity of 98 percent can be obtained from the wastewater on a large scale.

Description

technical field [0001] The invention relates to a method for large-scale recovery of valuable elements in industrial waste water, in particular to a method for large-scale recovery of scandium in titanium white waste acid water produced in the production process of titanium dioxide. Background technique [0002] Scandium is a rare earth element, which is mainly extracted from ilmenite sand, tungsten ore, tin ore, phosphate rock, rare earth ore, bauxite, zirconium concentrate, etc. Scandium is mainly enriched in the waste water and waste residue of these scandium treatment processes. Due to the low content (10-20mg / L scandium oxide), large processing capacity and high technical requirements, the recovery of scandium from waste water has not been promoted. [0003] Scandium oxide and scandium metal have special properties and are widely used in high-tech fields. Such as nuclear technology, lasers, battery materials, fluorescent materials, high-strength aluminum alloys, etc. ...

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): C01F17/00
Inventor 陈卫平钱晓泰陈青松王晓平刘荣丽
Owner 河南荣佳钪钒科技有限公司
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