CN1203950C - Method for preparing molybednum powder - Google Patents
Method for preparing molybednum powder Download PDFInfo
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- CN1203950C CN1203950C CN 03124669 CN03124669A CN1203950C CN 1203950 C CN1203950 C CN 1203950C CN 03124669 CN03124669 CN 03124669 CN 03124669 A CN03124669 A CN 03124669A CN 1203950 C CN1203950 C CN 1203950C
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- ammonium molybdates
- many ammonium
- powder
- ammoniacal liquor
- molybdenum powder
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- Inorganic Compounds Of Heavy Metals (AREA)
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Abstract
The present invention relates to a preparation method of molybdenum powder, which comprises: ammonium polymolybdate is dissolved in ammonia water, crystallized, calcined, reduced by hydrogen, screened, etc.; 60 to 450g of KOH is added to every 1000kg of the ammonium polymolybdate at the time of crystallization. The method of the present invention enables oversize materials of molybdenum powder to be greatly reduced, and the yield reaches 95%.
Description
Technical field:
The present invention relates to molybdenum powder preparation method.
Background technology:
Molybdenum powder can be processed into molybdenum alloy goods such as aluminum strip, molybdenum electrode and molybdenum plug, molybdenum plate base, molybdenum filament, molybdenum foil, is widely used in iron and steel, stress metal processing, fields such as electric light source, electrovacuum, metallurgy, space flight and war industry.
The present industrial method for preparing molybdenum powder comprises dissolves many ammonium molybdates after crystallization, calcination, hydrogen reducing and the operation of sieving in ammoniacal liquor.
Adopt this method to prepare molybdenum powder, screen overflow is a lot of when sieving, and sometimes up to 30～35%, has so just reduced the casting yield of molybdenum powder, has increased the cost of molybdenum product.
Summary of the invention:
The preparation method who the purpose of this invention is to provide a kind of Mo powder, the screen overflow when the minimizing molybdenum powder sieves, the casting yield of raising molybdenum powder.
For achieving the above object, technical scheme of the present invention comprises dissolves many ammonium molybdates after crystallization, calcining, hydrogen reducing and the operation of sieving in ammoniacal liquor, dissolution process is by many ammonium molybdates: pure water: the mixed of ammoniacal liquor=1: 0.2～0.25: 0.6, be heated to 60 ℃ of many ammonium molybdates of dissolving then, vapor pressure remains on 0.1～0.15Mpa under continuous stirring state when crystallization, add 60～450gKOH by the many ammonium molybdates of every 1000kg, the concentration time behind the interpolation KOH is 45～50 minutes.
Because of the activity of K in ammonium paramolybdate is very strong, when reduction, can quicken the fission of ammonium paramolybdate, the screen overflow of molybdenum powder is significantly reduced, casting yield reaches 95%.
Embodiment:
Embodiment 1: get the many ammonium molybdates of 1000kg, by many ammonium molybdates: pure water: ammoniacal liquor=toward stainless steel dissolving crystallized groove in add pure water 250l and ammoniacal liquor 600l at 1: 0.25: 0.6.Be heated to 60 ℃, many ammonium molybdates are dissolved, density is 1.58g/cm
3, vapor pressure remains on 0.1～0.15Mpa under the continuous stirring state of interpolation KOH 60g, and to keep solution boiling in the groove, concentration time is 50 minutes, and measuring crystalline mother solution proportion is 1.26g/cm
3The time blowing, drain, separate.Obtain molybdenum powder 511.3kg through calcining, hydrogen reducing with after sieving again, casting yield is 96.5%.
Embodiment 2: get the many ammonium molybdates of 1000kg, by many ammonium molybdates: pure water: ammoniacal liquor=toward stainless steel dissolving crystallized groove in add pure water 230l and ammoniacal liquor 600l at 1: 0.23: 0.6.Be heated to 60 ℃, many ammonium molybdates are dissolved, density is 1.6g/cm
3, vapor pressure remains on 0.1～0.15Mpa under continuous stirring state, to keep solution boiling in the groove, adds KOH 230g, and concentration time is 48 minutes, and measuring crystalline mother solution proportion is 1.25g/cm
3The time blowing, drain, separate, again through calcining, hydrogen reducing with sieve and obtain molybdenum powder 515.8kg, casting yield is 96.69%.
Embodiment 3: get the many ammonium molybdates of 1000kg, press many ammonium molybdates: pure water: ammoniacal liquor=1: 0.22: 0.6, add pure water 220l toward the dissolving crystallized groove of stainless steel, and add ammoniacal liquor 600l, heat to 60 ℃, many ammonium molybdates to be dissolved, density is 1.62g/cm
3Under continuous stirring state, vapor pressure keeps 0.1～0.15Mpa, to keep solution boiling in the groove.Add KOH 250g, concentration time is 47 minutes, and measuring crystalline mother solution is 1.24g/cm
3The time blowing, drain, separate, again through calcining, hydrogen reducing with sieve and make molybdenum powder 516.7kg, casting yield is 96.43%.
Embodiment 4: get the many ammonium molybdates of 1000kg, press many ammonium molybdates: pure water: ammoniacal liquor=1: 0.2: 0.6, in the stainless steel dissolving tank, add pure water 200l, and add ammoniacal liquor 600l, heat to 60 ℃.Many ammonium molybdates are dissolved, and density is 1.63g/cm
3Under continuous stirring state, vapor pressure remains on 0.1～0.15MPa to keep solution boiling in the groove, adds KOH 450g, and concentration time is 45 minutes, and measuring crystalline mother solution proportion is 1.24g/cm
3The time blowing, drain, separate, again through calcining, hydrogen reducing with sieve and make molybdenum powder 516.21kg, casting yield 96.38%.
Claims (1)
1, a kind of preparation method of Mo powder, comprise many ammonium molybdates are dissolved in ammoniacal liquor after crystallization, calcining, hydrogen reducing and the operation of sieving, dissolution process is by many ammonium molybdates: pure water: the mixed of ammoniacal liquor=1: 0.2～0.25: 0.6, be heated to 60 ℃ of many ammonium molybdates of dissolving then, it is characterized in that: vapor pressure remains on 0.1～0.15Mpa under continuous stirring state when crystallization, add 60～450gKOH by the many ammonium molybdates of every 1000kg, the concentration time behind the interpolation KOH is 45～50 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03124669 CN1203950C (en) | 2003-07-22 | 2003-07-22 | Method for preparing molybednum powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03124669 CN1203950C (en) | 2003-07-22 | 2003-07-22 | Method for preparing molybednum powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1480281A CN1480281A (en) | 2004-03-10 |
| CN1203950C true CN1203950C (en) | 2005-06-01 |
Family
ID=34152910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03124669 Expired - Fee Related CN1203950C (en) | 2003-07-22 | 2003-07-22 | Method for preparing molybednum powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1203950C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100506438C (en) * | 2006-11-29 | 2009-07-01 | 金堆城钼业股份有限公司 | Process for preparing coating molybdenum powder |
| CN100464902C (en) * | 2007-03-19 | 2009-03-04 | 江苏峰峰钨钼制品股份有限公司 | Method of eliminating potassium impurity from molybdenum powder |
| CN100462457C (en) * | 2007-05-25 | 2009-02-18 | 株洲硬质合金集团有限公司 | Method for preparing dipping molybdenum alloy |
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2003
- 2003-07-22 CN CN 03124669 patent/CN1203950C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1480281A (en) | 2004-03-10 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050601 Termination date: 20180722 |