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Method for preparing chemical pure neodymium fluoride

A pure neodymium fluoride and chemically pure technology, which is applied in the field of preparation of inorganic compounds, can solve the problems of not being able to meet the requirements of energy saving and purity, the electronic industry, and low purity of neodymium fluoride, and achieve easy control of the reaction process, high effect and efficiency , the effect of high purity

Inactive Publication Date: 2010-11-24
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Chemically pure neodymium fluoride is widely used in the electronics industry, and is also used as an additive to steel and non-ferrous alloys. The methods currently used include: 1. Dry method, that is, heating neodymium oxide in a fluorine stream to obtain anhydrous neodymium fluoride. The prepared neodymium fluoride has low purity and high impurities, which can only meet the production of some alloys and cannot meet the needs of the electronics industry; Both methods cannot meet the requirements of energy saving and purity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of chemically pure neodymium fluoride, the method is as follows:

[0023] (1) prepare neodymium chloride

[0024] Add 1.2kg of distilled water into the polytetrafluoro tank, add 0.8kg of neodymium oxide under constant stirring, it turns blue, continue to add 0.8kg of chemically pure hydrochloric acid (relative concentration 1.18, content 36% v / v), it turns from blue to Transparent black, stop adding, the reaction is complete, and solution A is obtained;

[0025] (2) Remove impurity barium and calcium

[0026] The temperature of solution A was raised to 80°C, and then 1 ml of sulfuric acid (relative concentration 1.84) was added, so that the sulfate group and the impurity barium and calcium ions of neodymium chloride formed sulfate precipitates, left to stand for 2 hours, and filtered to obtain filtrate B;

[0027] (3) Prepare chemically pure neodymium fluoride

[0028] Add 0.8 kg of hydrofluoric acid (content 40% m / m) to the B obtained in step 2 ...

Embodiment 2

[0032] A preparation method of chemically pure neodymium fluoride, the method is as follows:

[0033] (1) prepare neodymium chloride

[0034] Add 1.5kg of distilled water into the PTFE tank, add 1kg of neodymium oxide under constant stirring, it turns blue, continue to add 1kg of chemically pure hydrochloric acid (relative concentration 1.18, content 36%), from blue to transparent black, stop adding , the reaction is complete, and solution A is obtained;

[0035] (2) Remove impurity barium and calcium

[0036] Raise the temperature of industry A to 90°C, and then add 1.5 ml of sulfuric acid (relative concentration: 1.84). Make sulfate radical and impurity barium of neodymium chloride and calcium generate sulfate precipitate, leave standstill for 2 hours, filter, obtain filtrate B;

[0037] (3) Prepare chemically pure neodymium fluoride

[0038] Add 1 kg of hydrofluoric acid (content 40% m / m) into B obtained in step (2) and add 0.02 kg of oxalic acid to form a precipitate o...

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Abstract

The invention relates to a method for preparing chemical pure neodymium fluoride. The method comprises the following steps of: (1) preparing neodymium chloride, namely, performing a reaction of neodymium oxide and chemical pure hydrochloric acid to obtain solution A; (2) removing impurities of barium and calcium to obtain filtrate B; and (3) adding hydrofluoric acid and oxalic acid into B with continuous stirring to obtain neodymium fluoride deposit and draining. In the preparation method, the neodymium oxide reacts with the hydrochloric acid to generate the neodymium chloride, barium salt and calcium salt are removed by adding the sulfuric acid into a reaction product, so that the neodymium chloride is prepared, and the neodymium chloride reacts with the hydrofluoric acid to synthesize the neodymium fluoride and ammonia gas is introduced to the neodymium fluoride so that optimal chloride ion removing effect is achieved. The preparation method has the advantages of processing steps, advanced synthesis technology, easily-controlled reaction process, good effect and high efficiency. The prepared neodymium fluoride has high purity and low impurity content and can be widely applied in the market.

Description

technical field [0001] The invention belongs to the field of preparation methods of inorganic compounds, in particular to a preparation method of chemically pure neodymium fluoride. Background technique [0002] Chemically pure neodymium fluoride is widely used in the electronics industry, and is also used as an additive to steel and non-ferrous alloys. The methods currently used include: 1. Dry method, that is, heating neodymium oxide in a fluorine stream to obtain anhydrous neodymium fluoride. The prepared neodymium fluoride has low purity and high impurities, which can only meet the production of some alloys and cannot meet the needs of the electronics industry; Both methods cannot meet the requirements of energy saving and purity. Contents of the invention [0003] The purpose of the present invention is to overcome the disadvantages of the prior art and provide a method for preparing chemically pure neodymium fluoride with low impurity content and high purity. [00...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 胡建华
Owner TIANJIN CHEM REAGENT RES INST
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