Roasting decomposition process of mengite-RE concentrate and mengite-mixed bastnaesite RE concentrate

A technology of mixed rare earth and rare earth concentrate is applied in the field of metallurgy to achieve the effects of convenient combination, environmental protection operation cost saving and good economy.

Inactive Publication Date: 2004-09-01
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problem of serious environmental pollution in the prior art methods, the purpose of the present invention is to provide a decomposed monazite rare earth concentrate, monazite and bastnaesite mixed rare earth concentrate that reduces environmental pollution, has a simple and easy process, and improves production economic benefits. Methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Example 1. Roasting monazite rare earth concentrate with calcium oxide plus NaCl additive

[0026] Monazite+CaO(20~45%Wt)+NaCl(5~30%Wt) is calcined in the air for 1 hour, the temperature is 800~1000℃, the roasted product is dark red, the oxidation rate of cerium is 90%, and the leaching rate in sulfuric acid solution 95%.

example 2

[0027] Example 2. Roasting monazite and bastnaesium mixed rare earth concentrate with calcium oxide plus NaCl additive

[0028] Monazite and bastnaesium mixed type rare earth concentrate + CaO (10-25% Wt) + NaCl (5-20% Wt) are roasted in the air for 1 hour at a temperature of 800-1000 ° C, the roasted product is dark red, and the cerium is oxidized The rate is greater than 90%, and the leaching rate in sulfuric acid solution is 95%.

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Abstract

A calcining decomposition method for urdite rere-earth ore concentrate and F-C-Ce mixed rare-earth one concentrate is amied at the problem of environmental pollution in the process of high-temp. sulphuric acid calcining decomposition of rare-earth one concentrate in the prior art technique. In this invention used in a flux of calcium oxide plus sodium chloride for calcining decomposition of the said ore concentrates under the air atmosphere, the added flux quantity is 5-30 wt.%, the calcining temp. is 600-950 deg.C and calcining time is 10-90 min. This invention can realize the great reduction of sulphur dioxide and hydrogen fluoride discharge in the calcination tail gas so to reach the environment protection standard and great saving of spraying water and sulphuric acid.

Description

Technical field: [0001] The invention belongs to the technical field of metallurgy, in particular to a method for decomposing monazite rare earth concentrates and monazite-bastnaesite mixed type rare earth concentrates. Background technique: [0002] Monazite is a phosphate mineral mainly containing light rare earth elements and containing radioactive elements thorium, uranium and phosphorus, as well as zirconia, silicon dioxide and other impurity elements. The general formula of monazite is [Ce, La, Nd, Th]PO 4 . [0003] my country's Baotou rare earth concentrate has an annual production capacity of 70,000 tons, ranking first in the world. Baotou rare earth concentrate is characterized by a mixed mineral of bastnaesite and monazite. In order to efficiently decompose this kind of concentrate, people have carried out many years Various attempts have been made, and sodium hydroxide solution decomposition method, sodium carbonate roasting method, low-temperature sulfuric acid...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22B1/02C22B59/00
Inventor吴文远
OwnerNORTHEASTERN UNIV LIAONING