Method for preparing high-purity molybdenum trioxide

A molybdenum trioxide and high-purity technology, applied in the field of preparation of high-purity molybdenum trioxide, can solve the problems of large differences in the control of baking process parameters, large fluctuations in product quality, low process repeatability, etc., and can overcome many problems. Temperature zone baking, good particle size consistency, and the effect of reducing side reactions

Active Publication Date: 2013-07-10
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used roasting equipment includes rotary kiln, push boat furnace, etc. The roasting equipment used is different, the parameter control of the roasting process is quite different, and the repeatability of the process is not high; in addition, the existing technology usually uses multiple The temperature-zone roasting process requires strict control of the heating temperature in each temperature zone, so the requirements for roasting equipment are high; coupled with the extensive control of the industrial production process, the product quality fluctuates greatly and the yield rate is low

Method used

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  • Method for preparing high-purity molybdenum trioxide
  • Method for preparing high-purity molybdenum trioxide
  • Method for preparing high-purity molybdenum trioxide

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Embodiment 1

[0020] The preparation method of the present embodiment high-purity molybdenum trioxide comprises the following steps:

[0021] Step 1. Sieve the ammonium dimolybdate; the specific system of the sieving process is: first pass the ammonium dimolybdate through a 20-mesh sieve to get the sieve, and then pass the 120-mesh sieve to get the sieve. Oversieve; The typical component analysis data of described ammonium dimolybdate is shown in Table 1;

[0022] Step 2, place the ammonium dimolybdate after sieving in step 1 in a muffle furnace, and keep it warm for 1 hour at a temperature of 250°C for pre-baking treatment; the dimolybdate after pre-baking treatment The mass percent composition of molybdenum in ammonium is 61.12%;

[0023] Step 3, pass the ammonium dimolybdate after the prebaking process in step 2 through a 20-mesh sieve to obtain a sieved powder;

[0024] Step 4, place the sieved powder described in step 3 in a muffle furnace, heat it for 2 hours at a temperature of 440...

Embodiment 2

[0030] The preparation method of the present embodiment high-purity molybdenum trioxide comprises the following steps:

[0031] Step 1. Sieve the ammonium dimolybdate; the specific system of the sieving process is: first pass the ammonium dimolybdate through a 20-mesh sieve to get the sieve, and then pass the 120-mesh sieve to get the sieve. Oversieve; The typical component analysis data of described ammonium dimolybdate is shown in Table 2;

[0032] Step 2, place the ammonium dimolybdate after sieving in step 1 in a muffle furnace, and keep it warm for 1.5h at a temperature of 245°C for pre-roasting; the pre-baked dimolybdenum The mass percentage composition of molybdenum in ammonium acid is 61.22%;

[0033] Step 3, pass the ammonium dimolybdate after the prebaking process in step 2 through a 20-mesh sieve to obtain a sieved powder;

[0034] Step 4, place the sieved powder described in step 3 in a muffle furnace, heat it for 1.5 hours at a temperature of 440°C for roasting ...

Embodiment 3

[0039] The preparation method of the present embodiment high-purity molybdenum trioxide comprises the following steps:

[0040] Step 1. Sieve the ammonium dimolybdate; the specific system of the sieving process is: first pass the ammonium dimolybdate through a 20-mesh sieve to get the sieve, and then pass the 120-mesh sieve to get the sieve. Oversieve; The typical component analysis data of described ammonium dimolybdate is shown in Table 3;

[0041] Step 2, place the ammonium dimolybdate after sieving in step 1 in a muffle furnace, and keep it warm for 1h at a temperature of 255°C for pre-roasting; the pre-baked dimolybdate The mass percent composition of molybdenum in ammonium is 61.35%;

[0042] Step 3, pass the ammonium dimolybdate after the prebaking process in step 2 through a 20-mesh sieve to obtain a sieved powder;

[0043] Step 4, place the sieved powder described in step 3 in a muffle furnace, heat it for 1.5 hours at a temperature of 430°C for roasting treatment, ...

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Abstract

The invention provides a method for preparing high-purity molybdenum trioxide. The method comprises the steps that 1) ammonium dimolybdate is screened; 2) the screened ammonium dimolybdate is put into a muffle furnace and precalcined by heat insulation for 1-1.5 hours under the condition of 245-255 DEG C; 3) ammonium dimolybdate is screened by a 20-mesh sieve to obtain screening powders; 4) the screening powders are put in the muffle furnace and calcined by heat insulation for 1.5-2 hours under the condition of 430-460 DEG C, and high-purity molybdenum trioxide with the molybdenum mass content of not less than 66.63 percent is obtained after natural cooling. The method has simple preparation technology, and has high reproducibility; the high-purity molybdenum trioxide prepared according to the method has stable quality, uniform size and high molybdenum content, meets the requirements of molybdenum powders, molybdenum products, molybdenum materials and the like in molybdenum metallurgy and molybdenum chemical industry; and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of rare metal materials, and in particular relates to a preparation method of high-purity molybdenum trioxide. Background technique [0002] With the rapid development of modern science and technology, the application fields of molybdenum materials are increasingly broadened. High-purity molybdenum trioxide (that is, molybdenum trioxide with a molybdenum mass content of not less than 66.63%), as an important compound of molybdenum, is not only widely used in metal molybdenum products and Molybdenum chemical industry has also been widely used in the field of catalysts. [0003] In the industrial production process, ammonium dimolybdate, ammonium tetramolybdate, ammonium octamolybdate, etc. are often used as raw materials, and molybdenum trioxide is prepared by roasting process. Currently commonly used roasting equipment includes rotary kiln, push boat furnace, etc. The roasting equipment used ...

Claims

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Application Information

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IPC IPC(8): C22B34/34
Inventor 樊建军李辉
Owner JINDUICHENG MOLYBDENUM CO LTD
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