CN1173060C - Process for mix-smelting cell-grade mixed rare earth metals by using medium-frequency induction furnace - Google Patents
Process for mix-smelting cell-grade mixed rare earth metals by using medium-frequency induction furnace Download PDFInfo
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- CN1173060C CN1173060C CNB011432764A CN01143276A CN1173060C CN 1173060 C CN1173060 C CN 1173060C CN B011432764 A CNB011432764 A CN B011432764A CN 01143276 A CN01143276 A CN 01143276A CN 1173060 C CN1173060 C CN 1173060C
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Abstract
The present invention relates to a technical process for mixed smelting of battery-order mixed rare earth metal by using an intermediate frequency induction furnace. In a non-vacuum open system, mixed rare earth metal with low zinc content and low magnesium content is used as raw materials, the salt mixtures of potassium chloride and sodium chloride are used as protection covering agents, and an alumina ceramic crucible with high purity is used a melting container. A separate ingot mould without a bottom is used in an ingot casting process, and after the binary salt mixtures of potassium chloride and sodium chloride are melted at a temperature of 850 to 950 DEG C, the mixed rare earth metal with low zinc content and low magnesium content is slowly added. The melting time is from 20 to 40 minutes, and discharge and ingot casting are carried out. The ratio of the rare-earth metal to the protection agents is 3 to 5: 1, compounding elements in the product of the mixed and melted rare earth metal are uniform and stable, and the requirements for producing hydrogen storing powder of a nickel-hydrogen battery can be completely satisfied.
Description
One, technical field:
The present invention relates to a kind of is raw material with the low-zinc and low-magnesium mixed rare-earth metal, is protective material with the alkali metal chloride, and battery grade mischmetal is carried out consolute, belongs to metallurgical technology field.
Two, background technology:
At present, battery grade mischmetal is to be raw material with low-zinc and low-magnesium grouping rare earth chloride, utilize the electrolyzer of 2000A to produce, the processing parameter of every group of electrolysis system (electric current, voltage, temperature, electrolyte concentration) is not quite similar, and the grouping rare earth chloride do not accomplish in process of production yet between each batch to join part constituent content in full accord.Because the restriction of the manufacturing condition of raw material, capacity of equipment, lanthanum, cerium, praseodymium, neodymium content fluctuate greatly in the product, and especially lanthanum is the most serious, will directly influence the work-ing life of end product nickel metal hydride battery.
Three, summary of the invention:
The purpose of this invention is to provide a kind of medium-frequency induction furnace process for mix-smelting cell-grade mixed rare earth metals by using that utilizes; it is part element of joining of stable cell grade mixed rare earth metal; use Repone K and sodium-chlor binary mixing salt as the protection insulating covering agent; can prevent the oxidational losses of rare earth metal, reach and join a part element uniformity in the norium product.
The objective of the invention is to realize by following mode:
Medium-frequency induction furnace process for mix-smelting cell-grade mixed rare earth metals by using of the present invention; in antivacuum unlimited system being is raw material with the low-zinc and low-magnesium mixed rare-earth metal; with Repone K and sodium-chlor binary mixing salt protection insulating covering agent; with the high-purity alumina ceramic crucible is melting container; battery grade mischmetal is carried out consolute, in the ingot casting process with split type nothing uphill casting ingot mould.After Repone K and sodium-chlor binary mixing salt heat fused, slowly add regulation low-zinc and low-magnesium mixed rare-earth metal in batches, through the effect of medium-frequency induction furnace self whipping force, it is full and uniform that liquid rare earth metal is mixed after the fusing.Smelting temperature is 850-950 ℃, and smelting time is 20-40 minute, and norium is 3-5 with the ratio of protection insulating covering agent: 1, make the inner uniform ingredients unanimity of product.Reduce vacuum unit, reduce facility investment.Beat real sintering with quartz sand between melting container and medium-frequency induction furnace ruhmkorff coil and the crucible, body of heater and crucible are protected, and in quartz sand, add the boric acid of 3-5%, to improve the density of furnace lining.The protection insulating covering agent adopts Repone K and sodium-chlor binary mixing salt; can reduce smelting temperature, when the norium ingot casting, guarantee that rare earth metal ingot casting visual appearance is good; reduce the loss of rare earth metal in the consolute process simultaneously; adopted the split type nothing uphill casting ingot mould of high temperature steel material in the ingot casting process, casting finishes, treat that the rare earth metal temperature reduces after; take off ingot casting; make the very easily demoulding of rare earth metal, and do not have uphill casting ingot mould long service life, reduce labour intensity simultaneously.
Medium-frequency induction furnace consolute battery grade mischmetal production technique of the present invention is simple, user friendly production operation, a part constituent content unanimity is joined in rare earth metal product inside, proportion of raw materials when helping producing the ni-mh powder, the rare earth metal facility investment is few, is convenient to installation and maintenance, non-rare earth impurity content is low in the product, constant product quality, thus the performance of nickel metal hydride battery improved, and the quality product behind the consolute can satisfy user's requirement fully.
Four, embodiment:
The most preferred embodiment of medium-frequency induction furnace process for mix-smelting cell-grade mixed rare earth metals by using of the present invention:
Raw material: 197 tons of low-zinc and low-magnesium mixed rare-earth metals
18 tons of KCl-NaCl=unit mixing salts
Equipment: the GW-0.5T intermediate frequency does not have the iron core induction melting furnace
Production process: each stove drops into 20-25Kg binary mixing salt (production of technical grade packet header) earlier, wait to melt the back and add 250-255Kg low-zinc and low-magnesium mixed rare-earth metal (packet header production), intermediate frequency furnace power is transferred about main 100KW, temperature remains on 850-950 ℃, melting 20-30 minute, left standstill 5 minutes, treat that its inner composition comes out of the stove after full and uniform, pouring operation, go out casting of metals in no end 42CrMo material ingot mould with the stainless steel bale-out, carry out the smelting operation of next stove then, treat to carry out the demoulding after the metal cools, cleaning, polishing, packing becomes the finished product after the assay was approved by analysis.
Test-results: product is 194.35 tons of battery grade mischmetals, the about 420KWh/t of current consumption, the product internal component was uniform and stable after analyzing and testing result showed consolute, and non-rare earth impurity does not all exceed standard, and the product in same batch is joined a part constituent content uniformity.
Appoint analytical results (%) table one of getting five blocks of rare earth metals before the consolute in same batch
| Lot number TRE La/RE Ce/RE Pr/RE Nd/RE A-1 99.50 28.32 50.27 5.17 16.23 A-2 99.45 25.62 53.41 5.41 15.55 A-3 99.50 27.35 51.98 5.05 15.62 A-4 99.55 25.48 53.65 5.37 15.49 A-5 99.50 23.16 54.62 5.16 17.06 |
Appoint analytical results (%) table two of getting five blocks of rare earth metals behind the consolute in same batch
| Lot number TEE La/RE Ce/RE Pr/RE Nd/RE B-1 99.50 25.96 52.94 5.33 15.76 B-2 99.50 26.02 52.94 5.30 15.73 B-3 99.50 25.96 52.93 5.33 15.78 B-4 99.55 25.96 52.96 5.31 15.76 B-5 99.50 26.03 52.95 5.32 15.69 |
The analytical results of adjacent five batches of products (%) table three behind the consolute
| Lot number TRE La/RE Ce/RE Pr/RE Nd/RE C-1 99.50 26.11 52.94 5.28 15.67 C-2 99.45 25.91 52.83 5.43 15.62 C-3 99.50 25.88 52.77 5.47 15.88 C-4 99.45 26.02 52.73 5.35 15.90 C-5 99.50 26.08 52.89 5.46 15.66 |
Claims (3)
1; a kind of medium-frequency induction furnace process for mix-smelting cell-grade mixed rare earth metals by using of using; it is characterized in that: in antivacuum unlimited system being is raw material with the low-zinc and low-magnesium mixed rare-earth metal; with Repone K and sodium-chlor binary mixing salt protection insulating covering agent; with high-purity alumina ceramic earthenware snail is melting container; battery grade mischmetal is carried out consolute; in the ingot casting process with split type nothing uphill casting ingot mould; after Repone K and sodium-chlor binary mixing salt heat fused; slowly add regulation low-zinc and low-magnesium mixed rare-earth metal in batches; after the fusing through the effect of medium-frequency induction furnace self whipping force; it is full and uniform that liquid rare earth metal is mixed; smelting temperature is 850-950 ℃; smelting time is 20-40 minute, and norium is 3-5 with the ratio of protection insulating covering agent: 1.
2, medium-frequency induction furnace process for mix-smelting cell-grade mixed rare earth metals by using according to claim 1, it is characterized in that: beat real sintering with quartz sand between medium-frequency induction furnace ruhmkorff coil and the high-purity alumina ceramic crucible, in quartz sand, add the boric acid of 3-5%.
3, medium-frequency induction furnace process for mix-smelting cell-grade mixed rare earth metals by using according to claim 1 and 2, it is characterized in that: adopt the split type nothing uphill casting ingot mould of high temperature steel material, the finish demoulding, cleaning, polishing of casting is the uniform rare earth metal of internal component.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011432764A CN1173060C (en) | 2001-12-25 | 2001-12-25 | Process for mix-smelting cell-grade mixed rare earth metals by using medium-frequency induction furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011432764A CN1173060C (en) | 2001-12-25 | 2001-12-25 | Process for mix-smelting cell-grade mixed rare earth metals by using medium-frequency induction furnace |
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| CN1428450A CN1428450A (en) | 2003-07-09 |
| CN1173060C true CN1173060C (en) | 2004-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100351413C (en) * | 2005-12-01 | 2007-11-28 | 广州有色金属研究院 | Preparation method of high capacity rare earth magnesium base hydrogen storage alloy |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7988800B2 (en) * | 2004-02-20 | 2011-08-02 | Japan Metals And Chemicals Co., Ltd. | Method for producing Mg-REM-Ni based hydrogen-absorbing alloy |
| CN102786263B (en) * | 2012-07-04 | 2014-04-23 | 重庆三峡学院 | Permeable crystalline type concentrating agent prepared from construction waste micro-powder and method thereof |
| CN115389283A (en) * | 2022-06-24 | 2022-11-25 | 赣州艾科锐检测技术有限公司 | Internal control sample in rare earth metal or alloy detection, preparation method and application |
| CN117232257B (en) * | 2023-11-14 | 2024-02-27 | 赣州晨光稀土新材料有限公司 | Automatic production line and production method for rare earth |
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2001
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100351413C (en) * | 2005-12-01 | 2007-11-28 | 广州有色金属研究院 | Preparation method of high capacity rare earth magnesium base hydrogen storage alloy |
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