JPH035327A - Method for refining ferrous sulfate - Google Patents
Method for refining ferrous sulfateInfo
- Publication number
- JPH035327A JPH035327A JP13770589A JP13770589A JPH035327A JP H035327 A JPH035327 A JP H035327A JP 13770589 A JP13770589 A JP 13770589A JP 13770589 A JP13770589 A JP 13770589A JP H035327 A JPH035327 A JP H035327A
- Authority
- JP
- Japan
- Prior art keywords
- sulfuric acid
- crystal
- ferrous sulfate
- soln
- free
- 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
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 title claims abstract description 34
- 229910000359 iron(II) sulfate Inorganic materials 0.000 title claims abstract description 34
- 235000003891 ferrous sulphate Nutrition 0.000 title claims description 27
- 239000011790 ferrous sulphate Substances 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 21
- 238000007670 refining Methods 0.000 title description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000013078 crystal Substances 0.000 claims abstract description 37
- 238000002425 crystallisation Methods 0.000 claims abstract description 16
- 230000008025 crystallization Effects 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 abstract description 13
- 238000000926 separation method Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000004090 dissolution Methods 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 230000003472 neutralizing effect Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- 239000000243 solution Substances 0.000 description 16
- 239000002699 waste material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000002506 iron compounds Chemical class 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000011149 sulphuric acid Nutrition 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910017358 Fe2(SO4) Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- -1 scrap is used Chemical compound 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、鋼板等の酸洗廃液から、高品質なフェライト
用酸化鉄原料をはじめ、高級顔料用原料、メツキ用薬剤
等に利用される純度の高い硫酸第一鉄を精製する方法に
関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention can be used to produce high-quality iron oxide raw materials for ferrite, raw materials for high-grade pigments, chemicals for plating, etc. from pickling waste fluid of steel plates, etc. This invention relates to a method for refining highly pure ferrous sulfate.
〈従来の技術〉
鉄鋼業等において、鋼板等の酸洗工程より排出される廃
硫酸（硫酸第一鉄溶液）中には、通常不純物として５ｉ
０２ や、Ｍｎ、Ｚｎ。<Prior art> In the steel industry, etc., waste sulfuric acid (ferrous sulfate solution) discharged from the pickling process of steel plates, etc. usually contains 5i as an impurity.
02, Mn, Zn.
ＡＩＬ、Ｃｒ、Ｔｉ、Ｎａ等の金属イオンを含有してお
り、例えば、湿式酸化、焙焼等の工程を経てフェライト
原料用となる酸化第二鉄を生成する際、これらの不純物
が酸化第二鉄中に残存し、フェライト製品の磁気的、電
気的特性を著しく低下させる原因となっている。AIL contains metal ions such as Cr, Ti, and Na. For example, when producing ferric oxide, which is used as a raw material for ferrite, through processes such as wet oxidation and roasting, these impurities become ferric oxide. It remains in iron and causes a significant deterioration in the magnetic and electrical properties of ferrite products.
従来から実施されている不純物を除去するための手法の
１例として結晶化による精製法がある。 これは、技術
的には公知の手法であり、一般に利用されている。An example of a conventional method for removing impurities is a purification method using crystallization. This is a technically known method and is commonly used.
〈発明が解決しようとする課題〉
ところが、結晶化による精製法は、一般に結晶収量が低
く、経済的でないという問題点があった。 また、蒸発
濃縮等により結晶収量を増やせば、さらにエネルギーコ
ストが負担となるばかりでなく、結晶純度が低下すると
いう問題点があった。<Problems to be Solved by the Invention> However, the purification method by crystallization generally has a problem in that the yield of crystals is low and it is not economical. Furthermore, if the crystal yield is increased by evaporation concentration or the like, there is a problem that not only the energy cost becomes a burden but also the crystal purity decreases.
そこで、本発明は、上述するような問題点に着目し、安
価でかつ効率良く、高品質な硫酸第一鉄を精製する方法
を提供することを目的とするものである。Therefore, the present invention focuses on the above-mentioned problems and aims to provide an inexpensive, efficient, and high-quality method for refining ferrous sulfate.
く課題を解決するための手段〉
本発明者らは、硫酸第一鉄の精製方法について鋭意研究
を重ねた結果、結晶化工程に際して硫酸濃度を調整する
ことで、結晶収量を増加させ、かつ結晶純度も向上する
ことを見い出し、本発明を完成するに至った。Means for Solving the Problems> As a result of extensive research into a method for refining ferrous sulfate, the present inventors have found that by adjusting the sulfuric acid concentration during the crystallization process, the yield of crystals can be increased and the crystal yield can be improved. They have found that the purity is also improved and have completed the present invention.
即ち、本発明によれば、不純物を含有する硫酸第一鉄を
結晶化により精製する方法において、溶液調製時に遊離
硫酸が２ｗｔ％未満となるように調整した後、結晶晶出
に際し硫酸を添加して液中の遊離硫酸分含有量を２〜１
５ｗｔ％に調整し、析出する結晶を分離することを特徴
とする硫酸第一鉄の精製方法が提供される。That is, according to the present invention, in a method for purifying ferrous sulfate containing impurities by crystallization, after adjusting the free sulfuric acid content to less than 2 wt% during solution preparation, sulfuric acid is added during crystallization. The free sulfuric acid content in the solution is 2 to 1.
A method for purifying ferrous sulfate is provided, which is characterized by adjusting the concentration to 5 wt% and separating precipitated crystals.
前記の溶液調製時の温度は、５０〜８０℃であるのが好
ましい。The temperature during preparation of the solution is preferably 50 to 80°C.
前記の溶液調製時の硫酸第一鉄の濃度は２５ｗｔ％以上
であるのが好ましい。The concentration of ferrous sulfate during the preparation of the solution is preferably 25 wt% or more.
以下に本発明を第１図、第２図を参照しながらさらに詳
細に説明する。The present invention will be explained in more detail below with reference to FIGS. 1 and 2.
まず、廃硫酸溶液を原料とするフローを第１図に示す。First, Fig. 1 shows a flow using waste sulfuric acid solution as a raw material.
廃硫酸１は、濃縮・中和工程２で濃縮され、鉄及び鉄
化合物５（例えば製鉄所内発生のスクラップ、ミルスケ
ール等）を用いて濃縮廃硫酸中の遊離硫酸を中和する。The waste sulfuric acid 1 is concentrated in a concentration/neutralization step 2, and free sulfuric acid in the concentrated waste sulfuric acid is neutralized using iron and iron compounds 5 (for example, scrap generated in a steelworks, mill scale, etc.).
この時の溶液の温度は５０〜８０℃、好ましくは６０
〜７０℃にしておくと、硫酸第一鉄の溶解度が最大とな
るため、鉄濃度を高くすることができ有利である。 ま
た、遊離硫酸の中和に用いる鉄及び鉄化合物は、溶解し
て硫酸第一鉄となるものであればよいが、スクラップの
ような金属鉄を用いると、濃縮廃硫酸中に少量存在する
Ｆｅ”をＦｅ”に還元させる（Ｆｅ”＋１／２Ｆｅ−＋
３７２Ｆｅ”）ことができ、第一鉄イオンの濃度が増す
ので、さらに有利である。The temperature of the solution at this time is 50 to 80°C, preferably 60°C.
It is advantageous to maintain the temperature at ~70°C, since the solubility of ferrous sulfate is maximized, allowing the iron concentration to be increased. In addition, iron and iron compounds used for neutralizing free sulfuric acid may be those that dissolve to form ferrous sulfate, but if metal iron such as scrap is used, Fe, which is present in small amounts in concentrated waste sulfuric acid, may be used. " is reduced to Fe"(Fe"+1/2Fe-+
372Fe''), which is further advantageous because it increases the concentration of ferrous ions.
こうして得られる硫酸第一鉄溶液の濃度は、ＦｅＳＯ４
の重量％として２５ｗｔ％以上、好ましくは３０〜３５
ｗｔ％（飽和溶解度レベル）となる。 なお、２５ｗｔ
％未満では、結晶収量が少なくなり、経済的でない。The concentration of the ferrous sulfate solution thus obtained is FeSO4
25 wt% or more, preferably 30 to 35
wt% (saturated solubility level). In addition, 25wt
If it is less than %, the crystal yield will be low and it is not economical.
また、溶液中の遊離硫酸の濃度は、
Ｈ２ＳＯ４の重量％として２ｗｔ％未満、好ましくは０
．５ｗｔ％未満とする。 ２ｗｔ％以上存在すれば、
硫酸第一鉄の溶解度が減少するために不利である。Also, the concentration of free sulfuric acid in the solution is less than 2 wt%, preferably 0 as wt% of H2SO4.
．． The content shall be less than 5wt%. If it exists at 2wt% or more,
This is disadvantageous because the solubility of ferrous sulfate is reduced.
上記の硫酸第一鉄溶液は、次工程の結晶晶出工程３にて
外部水冷、真空蒸発等の手段により結晶化精製されるが
、−船釣な手法によれば、遊離硫酸が中和された状態で
の溶解度曲線から定まる結晶収量にとどまるという制約
がある。The above ferrous sulfate solution is crystallized and purified in the next step, crystallization step 3, by external water cooling, vacuum evaporation, etc.; There is a constraint that the crystal yield remains within the range determined from the solubility curve under the same conditions.
さらに、硫酸第一鉄の濃度を上げるために遊離硫酸を中
和したことでｐＨが上昇しているため、シリカ（Ｓｉ０
２）コロイドの重合、酸性域で沈殿する不純物金属の共
析により、結晶純度が良好とはいえないという問題があ
る。Furthermore, since the pH has increased due to neutralization of free sulfuric acid to increase the concentration of ferrous sulfate, silica (Si0
2) There is a problem in that the crystal purity is not good due to colloid polymerization and eutectoidation of impurity metals that precipitate in an acidic region.
本発明者らは、これらの問題点を解決するため、硫酸６
を添加して、遊離硫酸分含有量を２〜１５ｗｔ％、好ま
しくは、５〜１０ｗｔ％に調整して結晶分離することで
結晶収量を増加させ、かつ結晶純度も向上するという通
常相反する効果を同時に達成することに成功した。In order to solve these problems, the present inventors have developed sulfuric acid 6
By adding sulfuric acid to adjust the free sulfuric acid content to 2 to 15 wt%, preferably 5 to 10 wt%, and separating the crystals, the crystal yield is increased and the crystal purity is also improved, which are usually contradictory effects. succeeded in achieving both at the same time.
収量面に関しては、５０４’−イオンに関する共通イオ
ン効果により、ＦｅＳＯ４溶解度が低下したためと説明
される。 また、純度面に関しては、晶出時にｐＨを強
酸性域まで低下させることで、シリカ（ＳｉＯ２）の重
合不溶化の抑制、不純物金属の共析の減少が主の要因で
あり、その他Ｆｅと不純物金属の溶解度差も一部起因し
ているものと推定される。Regarding the yield, it is explained that the solubility of FeSO4 decreased due to the common ion effect regarding the 504'-ion. Regarding purity, the main factors are the suppression of polymerization and insolubilization of silica (SiO2) and reduction of eutectoid of impurity metals by lowering the pH to a strongly acidic range during crystallization, and other factors such as Fe and impurity metals. It is presumed that this is partly due to the difference in solubility.
なお、遊離硫酸の含有量が２ｗｔ％未満では、本発明に
よる硫酸添加効果は小さく、一方１５ｗｔ％を超えると
、本発明による効果は得られるが、添加量と効果が比例
しないので、経済的でない。 また、添加する硫酸は、
希釈による負効果を防ぐために、できる限り高濃度なも
のが望ましく、添加するタイミングとしては、晶出工程
中であれば任意に実施可能である。If the content of free sulfuric acid is less than 2 wt%, the effect of adding sulfuric acid according to the present invention is small, while if it exceeds 15 wt%, the effect of the present invention can be obtained, but the effect is not proportional to the amount added, so it is not economical. . In addition, the sulfuric acid to be added is
In order to prevent negative effects due to dilution, it is desirable to have as high a concentration as possible, and the addition can be done at any time during the crystallization process.
こうして析出した硫酸第一鉄結晶は、次工程である結晶
分離工程４にて分離され、精製結晶７を得る。The ferrous sulfate crystals thus precipitated are separated in the next step, crystal separation step 4, to obtain purified crystals 7.
一方、第２図のフローに示すように、結晶形態の原料１
１を利用する場合は、まず溶解工程１２にて純水１５溶
解を行い、前出フローと同様の硫酸第一鉄溶液（Ｈ，Ｓ
ｏ４遊離分２ｗｔ％未満、好ましくは温度５０〜８０℃
、ＦｅＳＯ４濃度２５ｗｔ％以上）とし、晶出工程以下
は同様である。On the other hand, as shown in the flowchart of Fig. 2, raw material 1 in crystalline form
When using 1, first dissolve 15 in pure water in the dissolution step 12, and add ferrous sulfate solution (H, S) as in the previous flow.
o4 free content less than 2 wt%, preferably temperature 50-80°C
, FeSO4 concentration of 25 wt% or more), and the same applies to the crystallization process and subsequent steps.
なお、第１図のフローで得た精製結晶を第２図のフロー
にて再度結晶化精製することも可能である。 また、遊
離硫酸を含んだ結晶分１１！！ ’７Ｆ液に関しては、
Ｆｅ歩止向上のため、原液調製の工程に適宜再使用する
ことも可能であるし、排水処理等に別途酸分を有効利用
することもでき、経済的である。Note that it is also possible to crystallize and purify the purified crystals obtained through the flow shown in FIG. 1 again through the flow shown in FIG. In addition, the crystal content containing free sulfuric acid is 11! ! Regarding '7F liquid,
In order to improve the Fe yield, it is possible to appropriately reuse it in the process of preparing the stock solution, and the acid content can also be effectively used separately for wastewater treatment, etc., which is economical.
〈実施例〉 以下に本発明を実施例に基づき、具体的に説明する。<Example> The present invention will be specifically described below based on Examples.
（実施例１）
第１図のフローに従い 鋼板の酸洗廃液（廃硫酸組成Ｆ
ｅＳＯ４１６，０ｗｔ％、Ｆｅ２（ＳＯ４）３０ 、５
ｗｔ％、遊離Ｈ２ＳＯ４７，５ｗｔ％）を原料として
、８０℃にて濃縮（濃縮率１．４倍）し、スクラップ（
鉄片）を過剰添加（３００ｇ／廃硫酸ＩＪＺ）して、溶
解・還元反応を行い、最終的な調製液の組成は、ＦｅＳ
Ｏ４３５，０ｗｔ％、Ｆ６２ （Ｓ ０４ ） ｓ＜
０．１ｗｔ％、遊１１Ｈ２ＳＯ４＜０．１ｗｔ％であり
、液温は７０℃であフた。(Example 1) According to the flow shown in Figure 1, pickling waste liquid for steel plates (waste sulfuric acid composition F
eSO416,0wt%, Fe2(SO4)30,5
wt%, free H2SO4 (7.5 wt%) as a raw material, it was concentrated at 80°C (concentration rate 1.4 times) and scrap (
Excessive addition (300g/waste sulfuric acid IJZ) of FeS
O435,0wt%, F62 (S 04 ) s<
0.1 wt%, free 11H2SO4<0.1 wt%, and the liquid temperature was 70°C.
この硫酸第一鉄溶液（各々１ｊＺ）に対し、９８％Ｈ２
ＳＯ４液を添加して、液中の遊離硫酸濃度が０ｗｔ％（
比較例）、２ｗｔ％（発明例−１）、５ｗｔ％（発明例
−２）、１０ｗｔ％（発明例−３）となるように調整し
、結晶晶出工程にて溶液を撹拌しながら外部水冷により
、各々３０℃、２０℃まで冷却し、遠心分離機を用いて
結晶分離を行い、硫酸第一鉄７水塩結晶（以下、結晶と
いう）を得た。 結晶収量の比較を表−１に示す。For this ferrous sulfate solution (1jZ each), 98% H2
Add SO4 solution until the free sulfuric acid concentration in the solution is 0wt% (
Comparative example), 2wt% (invention example-1), 5wt% (invention example-2), and 10wt% (invention example-3), and the solution was externally cooled with water while stirring in the crystallization step. The mixture was cooled to 30°C and 20°C, respectively, and crystal separation was performed using a centrifuge to obtain ferrous sulfate heptahydrate crystals (hereinafter referred to as crystals). A comparison of crystal yields is shown in Table 1.
次に上記と同様の実施フローに従フて、７０℃→２５℃
まで冷却し、遊離硫酸濃度Ｏｗｔ％（比較例）、８ｗｔ
％（発明例）の結晶成分分析値による純度の比較を表−
２に示す。Next, following the same implementation flow as above, 70℃ → 25℃
Free sulfuric acid concentration Owt% (comparative example), 8wt
A comparison of purity based on crystal component analysis values of % (invention example) is shown below.
Shown in 2.
これらの結果から、本発明によれば比較例と比べて５ｉ
ｎ２．Ｍｎ、Ｚｎ、Ａｎ、Ｃｒ。From these results, it can be seen that according to the present invention, 5i
n2. Mn, Zn, An, Cr.
Ｔｉの不純物含有量の少ない硫酸第一鉄結晶が高い収量
で得られることがわかる。It can be seen that ferrous sulfate crystals with a low content of Ti impurities can be obtained in high yield.
表 表 結晶収量はＦｅ５Ｏｎ・７Ｈ，Ｏの重量を示す。table table The crystal yield indicates the weight of Fe5On.7H,O.
相対比は比較例の値を基準とする。The relative ratio is based on the value of the comparative example.
〈発明の効果〉
本発明は、以上説明したように構成されているので、経
済的に効率良く高品質の硫酸第一鉄を精製することがで
きるという効果を奏する。<Effects of the Invention> Since the present invention is configured as described above, it has the effect of economically and efficiently refining high-quality ferrous sulfate.
従フて、本発明により得られた硫酸第一鉄を原料として
、焙焼反応により高品質なフェライト原料用酸化鉄を製
造とすることができ、その他高級顔料用原料、メツキ用
薬剤等にも利用可能である。Therefore, using the ferrous sulfate obtained by the present invention as a raw material, high-quality iron oxide for ferrite raw materials can be produced by roasting reaction, and it can also be used as a raw material for other high-grade pigments, a chemical for plating, etc. Available.
第１図および第２図は、本発明の硫酸第一鉄の精製工程
を示すフロー図である。
表中数字はＦｅ５０．重量ベース（ｍｇ／ｋｇ）表中［
］内はＦｅ２０ｓ換算値ベース（ｍｇ／ｋｇ）符号の説
明
１・・・硫酸溶液原料、
２・・・濃縮・中程工程、
３・・・晶出工程、
４・・・結晶分離工程、
５・・・鉄及び鉄化合物、
６・・・硫酸、
７・・・精製硫酸第一鉄、
１１・・・結晶原料、
１２・・・溶解工程、
１３・・・晶出工程、
１４・・・結晶分離工程、
１５・・・純水、
１６・・・硫酸、
１７・・・精製硫酸第一鉄
工
工FIGS. 1 and 2 are flow diagrams showing the ferrous sulfate purification process of the present invention. The numbers in the table are Fe50. Weight base (mg/kg) in the table [
] is based on Fe20s conversion value (mg/kg) Code explanation 1...Sulfuric acid solution raw material, 2...Concentration/intermediate process, 3...Crystallization process, 4...Crystal separation process, 5 ...Iron and iron compounds, 6.Sulfuric acid, 7.Purified ferrous sulfate, 11.Crystal raw material, 12.Dissolution step, 13.Crystallization step, 14. Crystal separation step, 15...Pure water, 16...Sulfuric acid, 17...Refined sulfuric acid Daiichi Iron Works
Claims (3)
する方法において、溶液調製時に遊離硫酸が２ｗｔ％未
満となるように調整した後、結晶晶出に際し硫酸を添加
して液中の遊離硫酸分含有量を２〜１５ｗｔ％に調整し
、析出する結晶を分離することを特徴とする硫酸第一鉄
の精製方法。(1) In a method of purifying ferrous sulfate containing impurities by crystallization, after adjusting the free sulfuric acid content to less than 2 wt% during solution preparation, sulfuric acid is added during crystallization to remove free sulfuric acid from the solution. A method for purifying ferrous sulfate, which comprises adjusting the sulfuric acid content to 2 to 15 wt% and separating precipitated crystals.
項１に記載の硫酸第一鉄の精製方法。(2) The method for purifying ferrous sulfate according to claim 1, wherein the temperature during preparation of the solution is 50 to 80°C.
以上である請求項１に記載の硫酸第一鉄の精製方法。(3) The concentration of ferrous sulfate at the time of preparing the solution is 25 wt%
The method for purifying ferrous sulfate according to claim 1, which is the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13770589A JPH035327A (en) | 1989-05-31 | 1989-05-31 | Method for refining ferrous sulfate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13770589A JPH035327A (en) | 1989-05-31 | 1989-05-31 | Method for refining ferrous sulfate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH035327A true JPH035327A (en) | 1991-01-11 |
Family
ID=15204895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13770589A Pending JPH035327A (en) | 1989-05-31 | 1989-05-31 | Method for refining ferrous sulfate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH035327A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003104728A (en) * | 2001-09-28 | 2003-04-09 | Nittetsu Mining Co Ltd | Method for treating iron-containing sulfuric acid solution |
| CN102400758A (en) * | 2011-11-23 | 2012-04-04 | 芜湖瑞创叉车有限公司 | Exhaust pipe with movable flange for internal combustion engine forklift |
-
1989
- 1989-05-31 JP JP13770589A patent/JPH035327A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003104728A (en) * | 2001-09-28 | 2003-04-09 | Nittetsu Mining Co Ltd | Method for treating iron-containing sulfuric acid solution |
| CN102400758A (en) * | 2011-11-23 | 2012-04-04 | 芜湖瑞创叉车有限公司 | Exhaust pipe with movable flange for internal combustion engine forklift |
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