CN1176233C - Method for purifying chromium - Google Patents
Method for purifying chromium Download PDFInfo
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- CN1176233C CN1176233C CNB021212368A CN02121236A CN1176233C CN 1176233 C CN1176233 C CN 1176233C CN B021212368 A CNB021212368 A CN B021212368A CN 02121236 A CN02121236 A CN 02121236A CN 1176233 C CN1176233 C CN 1176233C
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- chromium
- chromium metal
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Abstract
The present invention relates to a method for extracting metal chromium. In the method, chromium powder is formed at certain pressure, graphite powder and vegetable gum are added to the chromium powder; the chromium powder, the graphite powder and the vegetable gum are treated at the temperature of 1410DEG C to 1450DEG C under a vacuum condition for 6 h to 8 h in the extraction method; after the chromium is extracted, the impurity contents of oxygen, carbon, sulfur and nitrogen are greatly reduced. The present invention can be applied to metallurgy industries, electronic industries, etc.
Description
Technical field
The present invention relates to the method for the chromium metal that a kind of purification makes by thermite process.Can reduce the content of impurity carbon (C) in the chromium metal material, nitrogen (N), oxygen (O) and sulphur (S) by present method.
Background technology
Chromium is one of important alloying element, is used widely in industrial production, as producing Precise Alloy, resistance alloy, superalloy, plated metal component, steel etc.In recent years, also be used for high-tech sectors such as Aeronautics and Astronautics.
Chromium mainly exists with the form of chromite at nature, and it consists of FeOCr
2O
3Or FeCrO.China's chromium ore resource is poor, mainly relies on import.Metal current chromium can make by electrolytic process, thermite process or other pyrometallurgical processes.The chromium metal that makes with electrolytic process is tabular, and foreign matter content is 0.006%C, 0.5%O, 0.03%N, 0.03%S (weight percent); The chromium metal that makes with thermite process is block, and can grind to form less size, and foreign matter content is 0.03%C generally speaking, 0.5%O, 0.05%N, 0.02%S (weight percent).
Because very harsh to the requirement of gasification foreign matter content in the chromium metal in the metallurgical application, therefore, the chromium metal that the available technology adopting thermite process is produced can not satisfy the needs in sophisticated technology field.Chromium metal need be made with extra care, the content of these impurity is reduced to less than 0.01%C 0.03%O, 0.002%N, 0.004%S (weight percent).
U.S. Pat-4504310A discloses a kind of method of the chromium of purifying metals, the raw material that uses in the thermite process preparation process, is a raw material with chromic oxide and aluminium as the chromium of thermite process preparation, heat-generating agent is a potassium bichromate, in the chromium purification process, at first chromium is ground, utilize the traditional method moulding then, the tackiness agent that uses is resol, and, carry out vacuum sintering at last 200-230 ℃ of oven dry, sintering temperature is 1100-1400 ℃.But still contain 0.04 weight % oxygen in the product.
U.S. Pat-5092921A equally also discloses a kind of technology of the chromium of purifying metals; chromic oxide, aluminium powder, carbon dust and a kind of easy sulfurized metal-powder are mixed; mixture carries out sintering; sintering temperature is 1300 ℃; this easy sulfurized metal-powder can be selected from Ni, Cu, Sn or Hg, adopts vacuum atmosphere or protection of inert gas.As seen, in this technology, need various powders is mixed, but also will add metal-powder.
CN-1311723A discloses a kind of purify metals method of chromium of two-step approach of utilizing, at first utilize hydrogen to handle the about 2-10h of chromium metal at about 1200-1600 ℃, be less than or equal under the 15Pa pressure and the about 1200-1600 ℃ of about 2-60h of treatment of metal in vacuum chromium then, the chromium metal of purifying is reclaimed in cooling at last.As seen, owing to increased the hydrogen treat processing step, improved production cost greatly.
The present invention overcomes the defective of foregoing invention, and the chromium metal that thermite process is made carries out the high-temperature vacuum sintering after adding the special reagent moulding, foreign matter content is 0.01%C in the product that obtains, 0.03%O, 0.002%-0.0005%N, 0.004%S (weight percent).
Summary of the invention
A kind of method of the chromium that is used to purify metals, step is as follows:
Adopt thermite process to produce chromium metal, make heat-generating agent with Potcrate;
Chromium metal is ground, add the aqueous solution of a small amount of 3-5 μ m Graphite Powder 99 and vegetable jelly, after mixing, moulding, oven dry;
Chromium piece after the oven dry is put into sintering oven, vacuumize the back and under 1410-1450 ℃ of temperature, handle 6-8h;
The chromium metal that cooling and recovery purifying are crossed.
Wherein preferably chromium metal is milled to below 60 orders.
The add-on of vegetable jelly is 0.05% of a chromium metal weight.
The vacuum sintering temperature is preferably 1410-1430 ℃, most preferably is 1415 ℃.
Suction is preferably 2 * 10
-2Pa to 3 * 10
-2Pa.
Forming pressure is preferably 30MPa, and the compacting body of formation is for having the cylindrical shape that is less than or equal to Φ 25 * 18mm.
Under vacuum, cool to 200 ℃.
At first when thermite process is produced chromium metal, the low chromic oxide of foreign bodies content, aluminum shot, with Potcrate as heat-generating agent.Nitrogen, oxygen mainly exist with compound form in the chromium metal, are with CrN, Cr as nitrogen
2N, oxygen are with Cr
2O
3, Al
2O
3Exist, the reduction of nitrogen is by elevated temperature nitride to be decomposed to realize in the chromium metal.
And oxide compound is removed by high temperature adding reductive agent, could realize.The reduction resultant can be overflowed, can not pollution metal chromium, and can only select for use carbon as reductive agent.
Quickening is denitrogenated, the deoxygenation reaction is carried out, and all must improve temperature.The N of reduction system, CO dividing potential drop, i.e. gas clean-up.
Embodiment
Embodiment 1
The chromic oxide that foreign bodies content is low, aluminum shot, as heat-generating agent, various raw meal particle sizes are suitable with Potcrate, dry no moisture.Charge calculation should be accurate, and adding the aluminium amount is theoretical amount 92-93%, and batch mixing is even.Smelt to have reacted and slag was emitted major part in back 10 minutes.The cooling of chromium metal, ingot separated slag after 24 hours, and ingot metal makes the visible inclusion of surperficial No oxided film and naked eyes with the shot-blasting machine shot cleaning chromium ingot surface of dishing out.
The ingot metal that cleaning is good smashes, and is milled to below 60 orders it standby with ball-grinding machine.The aqueous solution that adds theoretical amount 95%3-5 μ m Graphite Powder 99 and vegetable jelly, mixing.After confirming that various materials evenly, be pressed into the cylindrical chromium piece of Φ 25 * 18mm with 30MPa pressure.The chromium piece is through 200 ℃, 3-4 hour thoroughly oven dry.
Chromium piece after the oven dry is put in the vacuum sintering furnace, is evacuated down to 10
-2The Pa level heats up, in 1415 ℃ of temperature, vacuum tightness 3 * 10
-2Handled 6-8 hour under the Pa condition, though this some volatilization loss of temperature chromium, the treatment time is short, still economical.
Chromium metal is cooled to 200 ℃ in the vacuum sintering furnace under vacuum condition, comes out of the stove and finishes the purification task.
C＜0.01% of purifying metals, O＜0.03%, N＜0.002%-0.0005%, S＜0.004%, Cr＞99.4%.
Claims (7)
1, a kind of method of the chromium that is used to purify metals, step is as follows:
Adopt thermite process to produce chromium metal, make heat-generating agent with Potcrate;
Chromium metal is ground, add the aqueous solution that 3-5 μ m Graphite Powder 99 and chromium metal weight 0.05% vegetable jelly are made, after mixing, moulding, oven dry;
Chromium piece after the oven dry is put into sintering oven, and vacuumizing is 2 * 10
-2Pa to 3 * 10
-2Pa handles 6-8h under 1410-1450 ℃ of temperature;
The chromium metal that cooling and recovery purifying are crossed.
2, the described method of claim 1 wherein is milled to chromium metal below 60 orders.
3, claim 1 or 2 described methods, wherein vacuum sintering temperature is 1410-1430 ℃.
4, the described method of claim 3, wherein vacuum sintering temperature is 1415 ℃.
5, claim 1 or 2 described methods, wherein forming pressure is 30MPa.
6, the described method of claim 5, wherein chromium metal has the cylindrical shape that is less than or equal to φ 25 * 18mm.
7, the described method of claim 1 wherein cools to 200 ℃ under vacuum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021212368A CN1176233C (en) | 2002-06-11 | 2002-06-11 | Method for purifying chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021212368A CN1176233C (en) | 2002-06-11 | 2002-06-11 | Method for purifying chromium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1394974A CN1394974A (en) | 2003-02-05 |
| CN1176233C true CN1176233C (en) | 2004-11-17 |
Family
ID=4744896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021212368A Expired - Fee Related CN1176233C (en) | 2002-06-11 | 2002-06-11 | Method for purifying chromium |
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| Country | Link |
|---|---|
| CN (1) | CN1176233C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899511B (en) * | 2012-10-31 | 2014-01-29 | 中信锦州金属股份有限公司 | Method for smelting high-purity metal chromium by external furnace method |
| CN102965526B (en) * | 2012-11-19 | 2014-07-02 | 锦州新桥高纯材料有限公司 | Method for producing high-purity metal chromium by using carbon reduction method |
| US10041146B2 (en) | 2014-11-05 | 2018-08-07 | Companhia Brasileira de Metalurgia e Mineraçäo | Processes for producing low nitrogen metallic chromium and chromium-containing alloys and the resulting products |
| US9771634B2 (en) * | 2014-11-05 | 2017-09-26 | Companhia Brasileira De Metalurgia E Mineração | Processes for producing low nitrogen essentially nitride-free chromium and chromium plus niobium-containing nickel-based alloys and the resulting chromium and nickel-based alloys |
| CN112795794B (en) * | 2021-04-06 | 2021-07-06 | 西安斯瑞先进铜合金科技有限公司 | Method for preparing high-purity metal chromium block by adopting wet-process mixed metal powder |
-
2002
- 2002-06-11 CN CNB021212368A patent/CN1176233C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1394974A (en) | 2003-02-05 |
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Owner name: JINZHOU CITY SHENGHONG TECHNOLOGY DEVELOPMENT CO., Free format text: FORMER OWNER: JINZHOU CITY SHENGHONG INDUSTRY CO.,LTD. Effective date: 20090327 |
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Effective date of registration: 20090327 Address after: Taihe District Ying Xiang Da Xu Cun Liaoning city in Jinzhou Province Patentee after: Shen Jinzhou city science and Technology Development Co Ltd Address before: Liaoning Province, Jinzhou City, Taihe District No. 56 Shangda Patentee before: Shenhong Industry Co., Ltd., Jinzhou City |
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