A method for extracting white carbon black and rare earth water purifying agent from waste rare earth polishing powder

A technology of rare earth polishing powder and white carbon black, applied in chemical instruments and methods, rare earth metal compounds, improvement of process efficiency, etc., can solve the secondary pollution of rare earth ions, low silicon oxide content in acid leaching slag, unavailability, etc. problems, to achieve the effect of significant economic value, obvious cost advantage, and broad market space

Active Publication Date: 2020-06-19
湖南景翌湘台环保高新技术开发有限公司 +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are related patents on the recycling of waste rare earth polishing powder, such as the Chinese patent "A Method for Recycling and Reusing Rare Earth Polishing Powder Waste" (publication number: 201910067961.7), which discloses a recycling method for rare earth polishing powder waste , using the method of acid leaching and hydrogen peroxide oxidation, the coagulant can be obtained after mixing and oxidizing the leaching solution and washing water. The solution obtained by this method is actually a mixed acid leaching solution. The fluctuation of the rare earth content in the powder will lead to the fact that the rare earth ion content in the actual acid solution may be higher than the aluminum content, and the lanthanum ion precipitation needs to be around PH 10, which leads to the addition and application of the acid leach solution in wastewater containing heavy metals. When the content of rare earth fluctuates greatly, it is easy to cause secondary pollution of rare earth ions
At the same time, this method is a traditional conventional acid leaching. Under this condition, the cerium dioxide and rare earth fluoride in the waste polishing powder are basically insoluble. The incomplete dissolution of these two not only causes the resources to not be fully utilized, but also leads to oxidation in the acid leaching residue. Silicon content is too low to utilize

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 extracting white carbon black and rare earth water purifying agent from waste rare earth polishing powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 Shown, a kind of waste rare earth polishing powder extracts the method for white carbon black and rare earth water purifying agent, and concrete steps are as follows:

[0036] (1) Add water to the waste rare earth polishing powder to make a slurry with a solid concentration of 15-30%, and put it into a centrifuge for mineral separation to obtain the first material (coarse particles and heavy materials with a particle size of 5 microns or more) and the second material ( Fine particles and light materials with a particle size of less than 5 microns); through gravity separation, the silicon content of the second material is more than 30% higher than that of the first material, and is initially purified. Rare earth content of the first material increases, stockpiling and disposal;

[0037] (2) Add the second material described in step (1) into the dilute acid solution for reaction, the easily soluble alumina and lanthanum oxide in the second material are d...

Embodiment 2

[0053] Such as figure 1 Shown, a kind of waste rare earth polishing powder extracts the method for white carbon black and rare earth water purifying agent, and concrete steps are as follows:

[0054] (1) Add water to the waste rare earth polishing powder to make a slurry with a solid concentration of 15-30%, and put it into a centrifuge for mineral separation to obtain the first material (coarse particles and heavy materials with a particle size of 5 microns or more) and the second material ( Fine particles and light materials with a particle size below 5 microns);

[0055] (2) Add the second material described in step (1) into the dilute acid solution for reaction, the easily soluble alumina and lanthanum oxide in the second material are dissolved, and the silicon oxide powder, cerium oxide and Lanthanum fluoride is left in the low-acid leaching residue, and the reaction solution is filtered to obtain a low-acid filtrate and a low-acid leaching residue;

[0056] (3) Add alu...

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
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for extracting white carbon black and rare earth water purifier from waste rare earth polishing powder. Adjust the lanthanum ratio and then dry to obtain polyaluminum lanthanum chloride or aluminum lanthanum sulfate. The filtered filter residue is leached with concentrated sulfuric acid and filtered to obtain cerium sulfate solution and high acid leaching residue. The cerium sulfate solution is subjected to pH and cerium-iron ratio etc. Adjust and dry to obtain polymerized iron cerium sulfate, separate, wash and dry the high-acid leaching residue, and then pulverize through a jet mill to obtain white carbon black. A method for extracting white carbon black and rare earth water purifying agent from waste rare earth polishing powder according to the present invention, through the method of this application, low content waste rare earth polishing powder can be prepared into white carbon black and water purifying agent for comprehensive utilization Most of the valuables, so as to realize the comprehensive recycling of low-content waste rare earth polishing powder.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling, in particular to a method for extracting white carbon black and rare earth water purifying agent from waste rare earth polishing powder. Background technique [0002] In recent years, with the rapid popularization and replacement of mobile phones and the widespread use of flat screens and car central control screens, the waste rare earth polishing powder solid waste produced every year exceeds 100,000 tons, and it is increasing year by year. Among them, the waste with high rare earth content Polishing powder, the company has applied for a patent, (Application No. 201811404138.2 A method of extracting aluminum, silicon oxide and rare earth from waste rare earth polishing powder), this method mainly fully recovers the rare earth in the high content of waste rare earth polishing powder so that generate value. However, in production practice, some low-content waste rare earth polishing...

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 & AuthorityPatents(China)
IPC IPC(8): C22B7/00C22B59/00C22B21/00C01B33/12C01G49/00
CPCC22B7/007C22B59/00C22B21/0023C01B33/12C01F17/30Y02P10/20
Inventor解付兵刘宜德张燕翟海军曹莹曾宪军周霜艳刘力玮赵永欧阳书径
Owner湖南景翌湘台环保高新技术开发有限公司