Efficient iron removal method for high-purity neodymium oxide for industrial processing

A neodymium oxide, neodymium hydroxide technology, applied in the improvement of process efficiency, rare earth metal oxide/hydroxide, lanthanide oxide/hydroxide, etc., can solve the problem of increased investment in production equipment and harsh operating conditions , complex process and other problems, to achieve the effect of good iron removal, good working conditions, and particle size refinement

Pending Publication Date: 2021-07-23
中稀(常州)稀土新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-purity neodymium oxide high-efficiency iron removal method for industrial processing, which solves the purpose of reducing the iron content in the neodymium oxide liquid by high precipitation in the prior art. These methods have complex processes, harsh operating conditions, It involves many kinds of chemicals, neodymium liquid heating, high energy consumption, and the need to purchase special equipment, which increases the investment in production equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high-efficiency iron removal method for high-purity neodymium oxide for industrial processing, comprising the following steps:

[0022] The neodymium scum containing 67wt% of neodymium was diffused with sulfuric acid with a concentration of 30wt%, to obtain a neodymium oxide solution containing 1.80g of iron, at room temperature. Add the reducing agent ascorbic acid crystal (CaHO6) containing 1.5 times of the theoretical amount of iron, and carry out the stirring reaction for 15 minutes at the same time, and the end point of the reduction reaction is detected with 5wt% potassium thiocyanate solution. After the reduction, adjust the pH value of the solution to 2.2 and add 0.3wt% o-phenanthroline solution for complexation reaction for 15 minutes, and slowly add 0.5molL ammonia water to the pH value under the condition of ultrasonic oscillation. The value is 5.5, and a white filter cake is obtained after filtration. After the filter cake is washed many times to remove th...

Embodiment 2

[0024] The neodymium scum containing 54wt% of neodymium was leached with sulfuric acid with a concentration of 30wt% to obtain a neodymium oxide solution containing 2.70g of iron. At room temperature, a reducing agent ascorbic acid crystal with a theoretical molar content of 1.3 times the iron was added, and the reaction was stirred for 20 minutes. Subsequent operating conditions are the same as in Example 1, and the FeO content in the final sample neodymium oxide is 0.018wt%.

Embodiment 3

[0026] The industrial neodymium hydroxide was leached with 30 wt% sulfuric acid to obtain a neodymium acid solution containing 0.8g / 1 iron. At room temperature, add reducing agent ascorbic acid crystals with 1.2 times the theoretical molar content of iron, stir and react for 15 minutes, adjust the p value of Luoye to 2.5 after complete reduction, and add o-phenanthrene with a concentration of 0.4wrt% according to 3.2 times the molar content of iron The linol solution was subjected to a complexation reaction for 20 minutes, and then 0.5 molL of ammonia water was slowly added dropwise to a pH value of 6 under the condition of ultrasonic vibration. Subsequent operating conditions are the same as in Example 1. Obtain the FeO3 content in the final sample neodymium oxide to be 0.010wt%.

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Abstract

The invention relates to the technical field of neodymium oxide, in particular to an efficient iron removal method for high-purity neodymium oxide for industrial processing, and solves the problem that the iron content in neodymium oxide liquid is reduced through precipitation and separation in the prior art. The methods have the problems of complex flow, harsh operation conditions, multiple related chemical types, neodymium liquid heating, high energy consumption, need of adding special equipment and the like, so that the investment of production equipment is increased. The product cost is increased, and the product is difficult to popularize and use in current industrial production at home and abroad. The efficienct iron removal method for high-purity neodymium oxide for industrial processing comprises the following steps: adding a reducing agent ascorbic acid crystal which is 1.2-1.5 times of the theoretical molar content of iron according to the content of impurity iron in a neodymium oxide solution at normal temperature; according to the method, the original production process does not need to be changed, treatment facilities do not need to be additionally built, the investment is low, the iron removal effect is good, and the Feg03 content in the obtained high-purity neodymium oxide powder is lower than 0.02 wt% and exceeds the first-grade product requirement of the industrial standard YS / T89-1995.

Description

technical field [0001] The invention relates to the technical field of neodymium oxide, in particular to a method for efficiently removing iron from high-purity neodymium oxide for industrial processing. Background technique [0002] Neodymium oxide, chemical formula Nd 2 o 3 , is a metal oxide. It is insoluble in water but soluble in acid. Neodymium oxide is mainly used as a coloring agent for glass and ceramics, as a raw material for the manufacture of metal neodymium and as a raw material for strong magnetic NdFeB. Adding 1.5% to 2.5% of nano-neodymium oxide to magnesium alloy or neodymium alloy can improve the high temperature performance of the alloy, gas Tightness and corrosion resistance, widely used as aerospace materials. In addition, nano-yttrium oxide neodymium garnet doped with nano-neodymium oxide produces short-wavelength laser beams, which are widely used in industry for welding and cutting thin materials with a thickness below 10 mm. In medical treatment...

Claims

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Application Information

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IPC IPC(8): C01F17/10C01F17/224C22B3/44C22B7/04C22B59/00
CPCC01F17/10C01F17/224C22B3/44C22B7/04C22B7/006C22B59/00C01P2006/80Y02P10/20
Inventor 孙鹏邓文俊周健罗中武朱亚清贺国伟施碧峰蒋宏徐敏
Owner 中稀(常州)稀土新材料有限公司
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