JPH03170640A - Manufacture of high purity high chromium alloy - Google Patents
Manufacture of high purity high chromium alloyInfo
- Publication number
- JPH03170640A JPH03170640A JP30849889A JP30849889A JPH03170640A JP H03170640 A JPH03170640 A JP H03170640A JP 30849889 A JP30849889 A JP 30849889A JP 30849889 A JP30849889 A JP 30849889A JP H03170640 A JPH03170640 A JP H03170640A
- Authority
- JP
- Japan
- Prior art keywords
- ferrochrome
- nitride
- low carbon
- ferrochrome nitride
- high purity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 229910000599 Cr alloy Inorganic materials 0.000 title claims description 8
- 239000000788 chromium alloy Substances 0.000 title claims description 8
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 44
- 150000004767 nitrides Chemical class 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 8
- 238000005121 nitriding Methods 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 10
- 238000010306 acid treatment Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 6
- 239000007858 starting material Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 4
- 229910052681 coesite Inorganic materials 0.000 abstract 3
- 229910052906 cristobalite Inorganic materials 0.000 abstract 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract 3
- 229910052682 stishovite Inorganic materials 0.000 abstract 3
- 229910052905 tridymite Inorganic materials 0.000 abstract 3
- 239000000843 powder Substances 0.000 abstract 1
- 238000010298 pulverizing process Methods 0.000 abstract 1
- 239000000725 suspension Substances 0.000 abstract 1
- 239000011651 chromium Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000003832 thermite Substances 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は合金の添加金属として用いられる高純度でク
ロム含有率の高いクロム合金の製造方法に関する．
［従来の技術］
高純度の含クロム合金（ Ｃｒ ６５ｗｔ％以上）は、
ニッケル基、鉄ニッケル基、コバルト基などのスーパー
アロイ分野で、主要戒分のクロム源として添加され、耐
食性または強度の向上に必要不可欠のものである．また
、溶接棒，粉末冶金の分野では粉末状の添加剤として鉄
、ニッケルの粉末と混合されて多量に使用されている．
従来の高クロム低炭素フェロクロムの製造方法としては
、大別すると（ａ）ペラン法、（ｂ）スウェーデン法、
（ｃ）多段ベラン法、（ｄ）その他が挙げられる．
このうち、（ａ），（ｂ）法は電気炉を用いて多量に生
産できる経済的な方法として知られている．また、（Ｃ
）法はクロム鉱石のｌ次スラグを溶解後、弱還元条件で
脱鉄し、最後に強還元して低炭素フエロクロムを得る方
法で、８５〜９０ｗｔ％の高いＣｒ成分のものが得れる
．さらに、＜ｄ）その他の方法としてアルミテルミット
法が考えられる．〔発明が解決しようとする課題コ
しかしながら、前記（ａ）ベラン法、（ｂ）スウエデン
法では、原料として経済的に入手できるクロム鉱石はＦ
ｅを多量に含むため、得られる低炭素フエロクロムのＣ
ｒＦｉ．分は７２％が上限である．（Ｃ〉多段ペラン法
は、高いＣｒ成分のものが得られる反面、製造工程で高
融点の溶融金属の取り扱いに問題があり、また多量に発
生するＣｒ含有量の低い低炭素フェロクロムの処理が必
要となり、さらにＳｉ，Ｏ，Ｎ等の不純物が多い等の欠
点がある．さらに、＜ｄ）アルミテルミット法では［Ａ
１１の混入が避けられず，また原料として使用する酸化
クロムや反応助剤が高価であるなどの問題がある．本発
明はかかる事情に鑑みてなされたもので、上記の難点を
解消し、クローム含有率７０〜９５ｗｔＸの高純度、高
クロム合金の製造方法を提供しようとするものである．
［問題点を解決するための手段及び作用］本発明による
高純度、高クロム合金の製造方法は、工業的に生産され
、不純物を含有する低炭素フェロクロムを出発原料とし
、前記原料を真空加熱により、原料中に含まれるシリカ
を還元して金属シリコンとする第１の工程と、前記第１
の工程を経た低炭素フエロクロムを、固体窒化法により
窒化して窒化フェロクロムを得る第２の工程と、前記窒
化フエロクロムを１關以下の粒度に破砕して、酸溶液と
混合、攪拌する酸処理により脱鉄する第３の工程と、脱
鉄された前記窒化フェロクロムを真空加熱して脱窒する
第４の工程とを含むものである．
第１の工程における原料中のシリカの還元は、原料が真
空中で加熱され、前記シリカが原料中のＣにより、下記
の還元反応により行われる．ＳｉＯｚ（ｓ）＋ ２Ｃ（
Ｓ）− Ｓｔ（ｓ） ＋ ２ＣＯ（ｇ）、上記の
式で、（，９）は固体、（ｇ）は気体を表す．以下同様
とする．
第２の工程で窒素雰囲気で加熱して得られる窒化フェロ
クロムはＣｒが８５〜９５ｖｔ＄の窒化物相とＦｅ，Ｓ
ｉ．Ｃｏおよび５〜２０ｗｔ％のＣｒを含む金属相から
なっている．
第３の工程では酸処理により前記金属相に含まれるＦｅ
，Ｓｉ，Ｐ，Ｎｉ．Ｃｏ，Ｍｎ等の不純物が除去される
．前記酸処理において、第１の工程で還元を行わない場
合は、非金属介在物の多い原料を使用するとＳ＋０２が
窒化物相とともに残留し、十分な脱珪が行われない．
第４の工程では、酸処理された窒化フェロクロムは、真
空中で加熱することにより下記反応により脱窒されると
ともにＣ．Ｏ等の不純物戒分が除去される．
ＣｒａＮ（ｓ） − ２Ｃｒ（ｓ）＋ １／２
Ｎｚ（ｇ）、Ｃ（ｓ）＋ ０（ｓ） −” ＣＯ（
ｇ）、［実施例］
第１の工程において、表１ − （１）に示す戒分の低
炭素フエロクロムを出発原料として、これを粒度３關以
下に破砕し、破砕された低炭素フェロクロム３０ｋｇを
真空加熱炉で、０．０５Ｔｏｒｒ． ｌ１５０’ｃ２４
Ｈｒの真空加熱を行い、前記出発原料中に含まれるシリ
カを、同じく出発原料中に含まれる炭素により還元して
金属シリコンとする．
前記第１の工程における真空加熱の後、第２の工程にお
いて、前記真空加熱炉に窒素を導入して、７６０Ｔｏｒ
ｒの窒素雰囲気とし、１１５０℃、２４Ｈｒの１１ 化
処理ｔｒ 行ツＴ−、ＩＮ］＝ ６．９ｗｔＬ ＩＯ］
＝ ０．０２０ｗｔ％を含有する表１ − （２＞の窒
化フェロクロムを得た．
続いて第３の工程において、第１図に示す攪拌装置を用
いて次の通り酸処理を行った．第２図は比較例（１）に
用いた攪拌装置である．前記第１図で１は反応容器、２
は窒化フェロクロムと酸溶液が混合されたスラリー，４
は攪拌羽根である．
容２１？ ＩＯＯｆの反応容器１に水５０ｊ！と０．３
問以下に破砕された前記窒化フェロクロムを１ ２ ｋ
ｇ入れ、攪拌機を用いて混合した。前記攪拌機は、上昇
流タイプの羽根を有し、羽根径／タンク径＝０．８で回
転数： ２５Ｏｒｐｍで運転された．前記攪拌機を用い
た攪拌方法では、窒化フェロクロムの粒子が全量、酸溶
液中に浮遊され、酸処理が効率的に行われる．前記反応
容器に、６２、５％．Ｈ２Ｓｏ４を全量で６１、連続的
に定量ボンブにより１０Ｈｒにわたって添加し、添加開
始がら１６Ｈｒ， ｉｌｌ拌を続けた．
この後、酸溶液と窒化フェロクロムが混合されたスラリ
ーを濾過、水洗、乾燥して９ｋｇを回収した．その成分
は表１−（３）に示す通りである．比較例（１）として
用いた攪拌装置を第２図に示す．第２図で３は容器底に
沈積した窒化フェロクロム、５は比較例に用いた攪拌羽
根で、その他は第１図と同様である．比較例（１）おい
ては、羽根径／タンク径＝０．６で、回転数； １５０
ｒｐＬで運転された．その他の酸処理および酸処理後の
回収の条件は、第１図の実施例と同様である．この場合
の攪拌方法では、攪拌力が弱く、窒化フェロクロムの粒
子が一部、反応容器の底部に沈積される．比較例（１〉
において回収された窒化フェロクロムの戒分は表１ −
（５）に示してある．表１−（５）と表１−（３）の
戒分を比較すると、実施例では比較例（１）に対して、
Ｃｒ含有率が太き（ 、Ｓｉ．Ｐの不純物は低下してい
る．第４の工程において、第３の工程で得られた回収物
に、カーボンブラック ０．３ｗＬ％を加えて混合し、
１２５０℃． ２４Ｈｒの真空加熱を行って脱窒した．
第４の工程により、表１ − （４）に示す通り Ｃｒ
，８８．５ｗｔ％ 、Ｓｔ，０．０２ｗｔ％．その他Ｐ
，Ｓ，Ｎｉ，Ｃｏ，Ｍｎ，Ｖ，Ｃ，Ｑ，Ｎがいずれも低
い高純度、高クロム合金が８．０ｋｇ得られた．
表
１
比較例（２〉として、第１の工程において、低炭素フェ
ロクロムを粒度３關以下に破砕した後、加熱処理による
還元工程を行わず、上記実施例の第２乃至第４の工程に
より、各工程で得られたものの或分を表１に対応して、
それぞれ表２ − （２），（３），（４）に示す．表
１−（１）と表２−（１）は同じ出発原料の成分である
．
表
２
表１− （３）．（４）と表２ − （３），＜４）を
Ｓｉにツいて比較すると、本実施例は比較例（２）に対
して、顕著に脱珪されていることが示されている．［発
明の効果］
本発明によれば、低炭素フェロクロムを真空加熱により
還元した後、窒化して得られる窒化フェロクロムを粉砕
し、これを水と混合して強攪拌しながら、連続的に酸溶
液を添加して脱鉄、不純物の除去を十分行い，その後真
空脱窒するので、市販の安価な低炭素フェロクロムから
特にＳｉが低減され、その他、Ｐ，Ｓ，Ｎｉ，Ｃｏ，Ｍ
ｎ，Ｃ．Ｎ，Ｏ等の不純物量が少なく、Ｃｒが７０〜９
５ｗＬ％の高純度、高クロム合金が経済的に製造可能で
ある．[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for producing a chromium alloy with high purity and high chromium content, which is used as an additive metal in an alloy. [Prior art] High purity chromium-containing alloy (Cr 65wt% or more) is
It is added as a major chromium source in the field of superalloys such as nickel-based, iron-nickel-based, and cobalt-based alloys, and is essential for improving corrosion resistance and strength. In addition, in the fields of welding rods and powder metallurgy, it is used in large quantities as a powdered additive, mixed with iron and nickel powder. Conventional methods for producing high-chromium, low-carbon ferrochrome can be roughly divided into (a) Perrin method, (b) Swedish method,
(c) multi-stage Veran method; (d) others. Among these methods, methods (a) and (b) are known as economical methods that can be produced in large quantities using an electric furnace. Also, (C
) method is a method in which the first-order slag of chromium ore is melted, iron is removed under weak reducing conditions, and finally strong reduction is performed to obtain low carbon ferrochrome, which has a high Cr content of 85 to 90 wt%. Furthermore, <d) The aluminum thermite method can be considered as another method. [Problems to be solved by the invention] However, in the above-mentioned (a) Veran method and (b) Swedish method, chromium ore, which is economically available as a raw material, is F.
Because it contains a large amount of e, the resulting low carbon ferrochrome C
rFi. The upper limit is 72%. (C) Although the multi-stage Perrin process can produce products with a high Cr content, there are problems in handling molten metal with a high melting point during the manufacturing process, and it is necessary to process low-carbon ferrochrome with a low Cr content, which is generated in large quantities. Furthermore, there are drawbacks such as a large amount of impurities such as Si, O, and N.Furthermore, in the <d) aluminum thermite method, [A
There are other problems, such as the unavoidable contamination of chromium oxide and reaction aids used as raw materials. The present invention has been made in view of the above circumstances, and aims to solve the above-mentioned difficulties and provide a method for producing a high-purity, high-chromium alloy with a chromium content of 70 to 95 wtX. [Means and effects for solving the problems] The method for producing a high-purity, high-chromium alloy according to the present invention uses industrially produced low-carbon ferrochrome containing impurities as a starting material, and heats the raw material in a vacuum. , a first step of reducing silica contained in the raw material to metal silicon;
A second step of obtaining nitrided ferrochrome by nitriding the low-carbon ferrochrome that has undergone the above steps by a solid-state nitriding method, and an acid treatment in which the nitrided ferrochrome is crushed to a particle size of one size or less, mixed with an acid solution, and stirred. The method includes a third step of removing iron, and a fourth step of vacuum heating the deironated ferrochrome nitride to denitrify it. The reduction of silica in the raw material in the first step is carried out by heating the raw material in a vacuum and reducing the silica with C in the raw material as described below. SiOz(s)+2C(
S) - St(s) + 2CO(g), in the above formula, (,9) represents solid and (g) represents gas. The same shall apply hereinafter. Ferrochrome nitride obtained by heating in a nitrogen atmosphere in the second step has a nitride phase containing 85 to 95 vt$ of Cr and Fe, S.
i. It consists of a metallic phase containing Co and 5 to 20 wt% Cr. In the third step, Fe contained in the metal phase is removed by acid treatment.
, Si, P, Ni. Impurities such as Co and Mn are removed. In the acid treatment, if reduction is not performed in the first step and a raw material containing many nonmetallic inclusions is used, S+02 will remain together with the nitride phase, and sufficient desiliconization will not be achieved. In the fourth step, the acid-treated ferrochrome nitride is denitrified by the following reaction by heating in vacuum, and C. Impurity precepts such as O are removed. CraN(s) − 2Cr(s) + 1/2
Nz (g), C (s) + 0 (s) −” CO (
g), [Example] In the first step, the low carbon ferrochrome shown in Table 1-(1) was used as a starting material, and it was crushed to a particle size of 3 degrees or less, and 30 kg of the crushed low carbon ferrochrome was In a vacuum heating furnace, the temperature was 0.05 Torr. l150'c24
The silica contained in the starting material is reduced by the carbon also contained in the starting material to form metallic silicon by vacuum heating at 100 hr. After the vacuum heating in the first step, in the second step, nitrogen is introduced into the vacuum heating furnace and heated to 760 Torr.
1150° C. and 24 hours in a nitrogen atmosphere of 1150° C.
Ferrochrome nitride of Table 1-(2) containing = 0.020 wt% was obtained.Subsequently, in the third step, acid treatment was performed as follows using the stirring device shown in Figure 1.Second The figure shows the stirring device used in Comparative Example (1).In Figure 1, 1 is a reaction vessel, 2
is a slurry of ferrochrome nitride and acid solution, 4
is a stirring blade. Yong 21? 50j of water in reaction container 1 of IOOf! and 0.3
The ferrochrome nitride crushed to a size of 1 2 k
g and mixed using a stirrer. The stirrer had an upward flow type blade, and was operated at a rotation speed of 25 Orpm with blade diameter/tank diameter = 0.8. In the stirring method using the above-mentioned stirrer, the entire amount of ferrochrome nitride particles is suspended in the acid solution, and the acid treatment is efficiently performed. Into the reaction vessel, 62.5%. A total amount of 61 H2So4 was added continuously using a metered bomb over 10 hours, and stirring was continued for 16 hours from the beginning of the addition. Thereafter, the slurry containing the acid solution and ferrochrome nitride was filtered, washed with water, and dried to recover 9 kg. Its components are shown in Table 1-(3). Figure 2 shows the stirring device used in Comparative Example (1). In Figure 2, 3 is the ferrochrome nitride deposited on the bottom of the container, 5 is the stirring blade used in the comparative example, and the rest is the same as in Figure 1. In comparative example (1), blade diameter/tank diameter = 0.6, rotation speed; 150
It was operated by rpL. Other conditions for acid treatment and recovery after acid treatment are the same as in the example shown in FIG. In this case, the stirring method has a weak stirring force, and some of the ferrochrome nitride particles are deposited at the bottom of the reaction vessel. Comparative example (1)
Table 1 shows the contents of ferrochrome nitride recovered in
It is shown in (5). Comparing the precepts in Table 1-(5) and Table 1-(3), in the example, compared to comparative example (1),
The Cr content is high (Si. P impurities are reduced. In the fourth step, 0.3 wL% of carbon black is added and mixed to the recovered material obtained in the third step,
1250℃. Denitrification was performed by vacuum heating for 24 hours.
Through the fourth step, as shown in Table 1-(4), Cr
, 88.5wt%, St, 0.02wt%. Other P
, S, Ni, Co, Mn, V, C, Q, and N. 8.0 kg of high purity, high chromium alloy was obtained. Table 1 Comparative Example (2) In the first step, after crushing low carbon ferrochrome to a particle size of 3 degrees or less, the reduction step by heat treatment was not performed, and the second to fourth steps of the above example were carried out. A certain portion of what was obtained in each step is shown in Table 1.
They are shown in Table 2-(2), (3), and (4), respectively. Table 1-(1) and Table 2-(1) have the same starting material components. Table 2 Table 1- (3). Comparing (4) and Table 2-(3), <4) with respect to Si, it is shown that this example is significantly desiliconized compared to comparative example (2). [Effects of the Invention] According to the present invention, after reducing low carbon ferrochrome by vacuum heating, nitrided ferrochrome obtained by nitriding is crushed, mixed with water, and continuously poured into an acid solution while stirring strongly. is added to sufficiently remove iron and impurities, and then vacuum denitrification is performed, so Si is particularly reduced from commercially available low-carbon ferrochrome, and other materials such as P, S, Ni, Co, and M
n,C. The amount of impurities such as N and O is small, and the Cr content is 70 to 9.
A high purity, high chromium alloy of 5wL% can be produced economically.
第１図は本実施例の攪拌装置、第２図は比較例（１）の
攪拌装置である．Figure 1 shows the stirring device of this example, and Figure 2 shows the stirring device of comparative example (1).
Claims (2)
ロクロムを出発原料とし、前記原料を真空加熱により、
原料中に含まれるシリカを還元して金属シリコンとする
第１の工程と、前記第１の工程を経た低炭素フェロクロ
ムを、固体窒化法により窒化して窒化フェロクロムを得
る第２の工程と、前記窒化フェロクロムを１ｍｍ以下の
粒度に破砕して、酸溶液と混合、攪拌する酸処理により
脱鉄する第３の工程と、脱鉄された前記窒化フェロクロ
ムを真空加熱して脱窒する第４の工程とを含む高純度、
高クロム合金の製造方法。(1) Using industrially produced low carbon ferrochrome containing impurities as a starting material, the raw material is heated in vacuum,
a first step of reducing silica contained in the raw material to metal silicon; a second step of nitriding the low carbon ferrochrome that has undergone the first step by a solid-state nitriding method to obtain ferrochrome nitride; A third step is to crush the ferrochrome nitride to a particle size of 1 mm or less, mix it with an acid solution, and remove iron by an acid treatment, and a fourth step to denitrify the deironated ferrochrome nitride by vacuum heating. High purity, including
Method for manufacturing high chromium alloys.
ロムが酸溶液の中で全体が浮遊するように攪拌、混合す
ること、および酸溶液を連続的に添加して反応させるこ
と、を含む請求項１の高純度、高クロム合金の製造方法
。(2) The acid treatment in the second step involves stirring and mixing the crushed ferrochrome nitride so that it is entirely suspended in the acid solution, and continuously adding the acid solution to cause the reaction. A method for producing a high purity, high chromium alloy according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30849889A JPH03170640A (en) | 1989-11-28 | 1989-11-28 | Manufacture of high purity high chromium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30849889A JPH03170640A (en) | 1989-11-28 | 1989-11-28 | Manufacture of high purity high chromium alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03170640A true JPH03170640A (en) | 1991-07-24 |
Family
ID=17981739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30849889A Pending JPH03170640A (en) | 1989-11-28 | 1989-11-28 | Manufacture of high purity high chromium alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03170640A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013187347A1 (en) * | 2012-06-15 | 2013-12-19 | Ｊｆｅマテリアル株式会社 | Method for producing ferrochromium, and ferrochromium |
| CN103937984A (en) * | 2014-04-25 | 2014-07-23 | 甘肃锦世化工有限责任公司 | Method for preparing metallic chromium from chromium-containing cast iron |
-
1989
- 1989-11-28 JP JP30849889A patent/JPH03170640A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013187347A1 (en) * | 2012-06-15 | 2013-12-19 | Ｊｆｅマテリアル株式会社 | Method for producing ferrochromium, and ferrochromium |
| JPWO2013187347A1 (en) * | 2012-06-15 | 2016-02-04 | Ｊｆｅマテリアル株式会社 | Ferrochrome production method and ferrochrome |
| CN103937984A (en) * | 2014-04-25 | 2014-07-23 | 甘肃锦世化工有限责任公司 | Method for preparing metallic chromium from chromium-containing cast iron |
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