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Method for purifying ammonium perrhenate

A technology of ammonium perrhenate and purification method, which is applied in chemical instruments and methods, rhenium compounds, inorganic chemistry, etc., can solve the problems of low purity and low recovery rate of ammonium perrhenate, and achieve the effect of reducing losses

Inactive Publication Date: 2020-03-17
JINDUICHENG MOLYBDENUM CO LTD
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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 method for purifying ammonium perrhenate, which solves the problems of low recovery rate and low purity of ammonium perrhenate in the prior art

Method used

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  • Method for purifying ammonium perrhenate
  • Method for purifying ammonium perrhenate

Examples

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preparation example Construction

[0023] The preparation method of thick ammonium perrhenate is specifically:

[0024] Roast the molybdenum concentrate with a rhenium content of 15-20g / t to obtain rhenium heptoxide, the roasting temperature is 450-700°C, and the roasting time is 4-12h, and then the rhenium heptoxide is sprayed with water to form rhenium-containing The eluent, wherein the concentration of rhenium is 5-20mg / L, is then adsorbed by using a complex amine-based weakly basic macroporous anion resin (pore size is 50-100nm), and after saturation, use ammonia water with a mass fraction of 1.5-4.5% Carry out elution to obtain a desorption solution with a rhenium concentration of 2000-4000mg / L, evaporate and concentrate until the rhenium concentration is above 10000mg / L, and finally freeze at -10°C-0°C for 48-72h to obtain a rhenium content of 35-58% crude ammonium perrhenate;

[0025] Step 2, add hydrogen peroxide to the crude ammonium perrhenate solution obtained after step 1, stir for 2-3 minutes, oxi...

Embodiment 1

[0034] A kind of ammonium perrhenate purification method of the present invention, specifically implement according to the following steps:

[0035] Step 1, adding crude ammonium perrhenate to ultrapure water at a temperature of 85°C, dissolving in a stirring redissolving tank, and then filtering through three-stage sieves of 600 mesh, 100 mesh and 50 mesh in sequence to remove insoluble impurities, Obtain thick ammonium perrhenate solution;

[0036] The mass ratio of crude ammonium perrhenate to ultrapure water is 1:3;

[0037] Rhenium metal content in the crude ammonium perrhenate is 47.6%;

[0038] Step 2, adding hydrogen peroxide to the crude ammonium perrhenate solution obtained after step 1, stirring for 2 minutes, oxidizing the low-valence ions in the solution to high-valence ions, then adding ammonia water, stirring for 2 minutes, to obtain a mixed solution;

[0039] The volume ratio of crude ammonium perrhenate solution, hydrogen peroxide and ammonia water is 15:1:1...

Embodiment 2

[0047] A kind of ammonium perrhenate purification method of the present invention, specifically implement according to the following steps:

[0048] Step 1, adding crude ammonium perrhenate to ultrapure water at a temperature of 90°C, dissolving in a stirring redissolving tank, and then filtering through three-stage sieves of 700 mesh, 200 mesh and 60 mesh in sequence to remove insoluble impurities, Obtain thick ammonium perrhenate solution;

[0049] The mass ratio of crude ammonium perrhenate to ultrapure water is 1:4;

[0050] Rhenium metal content in the crude ammonium perrhenate is 42.9%;

[0051] Step 2, adding hydrogen peroxide to the crude ammonium perrhenate solution obtained after step 1, stirring for 2 minutes, oxidizing the low-valence ions in the solution to high-valence ions, then adding ammonia water, stirring for 2 minutes, to obtain a mixed solution;

[0052] The volume ratio of crude ammonium perrhenate solution, hydrogen peroxide and ammonia water is 20:1:1...

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Abstract

The invention discloses a method for purifying ammonium perrhenate. The method specifically comprises the steps: firstly, adding crude ammonium perrhenate into ultrapure water, dissolving, then sequentially filtering through three stage of screens to obtain a crude ammonium perrhenate solution, then adding hydrogen peroxide and ammonia water, stirring, then adsorbing through two cation exchange resins connected in series, evaporating, concentrating, freezing, crystallizing, filtering and drying to obtain ammonium perrhenate. The purity of the ammonium perrhenate prepared by the method disclosed by the invention is 99.99% or above, the loss of the ammonium perrhenate subjected to multiple evaporative crystallization can be effectively reduced, and the recovery rate of the ammonium perrhenate is 95% or above.

Description

technical field [0001] The invention belongs to the technical field of ammonium rhenate purification, in particular to an ammonium perrhenate purification method. Background technique [0002] At present, the purification of high-purity ammonium perrhenate is generally carried out by repeated re-dissolution, evaporation and crystallization. That is, the ammonium perrhenate product is obtained by dissolving, evaporating, freezing and crystallizing the crude product for many times, but the process is cumbersome, and the recovery rate of ammonium perrhenate is not high, only about 60-70%, which is extremely difficult in industrial applications. few. [0003] In the recovery process of ammonium perrhenate, the impurity content of crude products is high, and purification through multiple redissolution and crystallization cannot meet the requirements of on-site production and product purity. more. In order to improve the recovery rate and purification efficiency of ammonium per...

Claims

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Application Information

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IPC IPC(8): C01G47/00
CPCC01G47/00C01P2006/80
Inventor 王寒飞司博杜小晖马力言李卫昌徐元博刘刚
Owner JINDUICHENG MOLYBDENUM CO LTD
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