CA1059728A - Process for manufacture of ferrosilicon nitride - Google Patents
Process for manufacture of ferrosilicon nitrideInfo
- Publication number
- CA1059728A CA1059728A CA252,339A CA252339A CA1059728A CA 1059728 A CA1059728 A CA 1059728A CA 252339 A CA252339 A CA 252339A CA 1059728 A CA1059728 A CA 1059728A
- Authority
- CA
- Canada
- Prior art keywords
- acid
- nitride
- ferrosilicon
- weight
- temperature
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/0602—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with two or more other elements chosen from metals, silicon or boron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
Abstract
ABSTRACT OF THE DISCLOSURE
Ferrosilicon nitride, to utilized in the molten iron through of a blast furnace system, is prepared by oxidation of a blend of 1 to 100 parts by weight of a dilute solution of acid with 100 parts by weight of ferrosilicon nitride. The oxidation can be carried out in the presence of wet air at a temperature in the range of 50 to 200°C. Inorganic acids such as HCl, H2SO4, HNO3, H3PO4, H2Cr2O7 and H2CrO4 are preferred, although organic acids such as CH3COOH, H2C2O4, HCOOH, tartaric acid and citric acid are also useful.
Ferrosilicon nitride, to utilized in the molten iron through of a blast furnace system, is prepared by oxidation of a blend of 1 to 100 parts by weight of a dilute solution of acid with 100 parts by weight of ferrosilicon nitride. The oxidation can be carried out in the presence of wet air at a temperature in the range of 50 to 200°C. Inorganic acids such as HCl, H2SO4, HNO3, H3PO4, H2Cr2O7 and H2CrO4 are preferred, although organic acids such as CH3COOH, H2C2O4, HCOOH, tartaric acid and citric acid are also useful.
Description
- L
~S97;~3 Tllis invcntion is conccrllcd wi~h a process for the manufacture of ferrosillcon nitride, more specifically, this invention is concerncd with a trcatmcnt with acid for producing fcrrosilicon nitride huving ~ silicon nitride content of 65 to 85~ by weight as the material for the molten iron trough in thc bLast furnuce system.
It has heretofore been known to use ferrosilicon nitride as the material for the molten iron trough in the blast furnace system. Ferrosilicon nitride, which is superior in heat-resisting, spailing proofing and slag-resisting properties, consists of silicon nitride pf 65 to 85% by weight, impurities containing 0.5 to 2~o by weight of Ca, ~1, etc. and residual iron or unreacted ferrosilicon. As the material for the molten iron trough in the blast furnacc system other than said ferrosilicon nitride, there is generally used a mixture which comprises as a main component, such refIactory substance as silicon carbi~e, carbon, aluminum oxide or silicon oxide and blending this m~in component with such an organic binding agent as tar or pitch, a water-so;lu~le binding agent, such a clay binding agent as clay or k~lulin, and furthermore such a bindillg agont as phosphoric acid or molasses. When ferrosilicon nitride is used as the trough material and blended with a binding agent, the quality of the trough produccd is lurgcly influcnccd by thè binding ~gent used.
Bccuusc, an organic ~indillg ugcrlt such as pitch OI' tar emits gusos of oifellsivc odor during thc opcrution or on exposure to henting. Wut~r-solu~ indillg agcnt rcpresontcd by polyvinyl ~L~S9728 alcohol is cxpcnsive. Whe~l ferrosilicon nitride us the trough muterial is blcn~cd with thc binding agcnt cont~ining water it generates remarkable heu-t, and if it is left to stand as it is, it dries up crisp and a portion thereof becomes too hard to be used. Accordingly, the disadvantage entailed here is a basic problem which issues from the composition of ferro-silicon nitride.
The present inventors studied in looking for the development of ferrosilicon nitride for the molten iron trough by using a w~ter containing binding agent. They discovered that the present treatment for obtaining ferrosilicon nitridc of fine quality is very useful in the related industry in points of dissolving the drawbacks of generation of heat in using a binding agent containing water therein. That is, this invention is characterized by adding acid, more preferably the diluted solution of acid of 1 to 100 parts by weight to ferrosilicon nitride of 100 parts by wcight, blending well ~nd then subjecting the mixture to the air oxidation at temperature of 50 to 200C.
Fig. 1 i5 a graph showing the relation between the treatillg hours and the gencration of heat observ~d when ferrosilicon nitride was treated with dilute hydrochloric acid.
Ferrosilicon nitride consists of silicon ni-tri(le (Si3N~) of 65 to 85~ by wcight, impuritios contuining 0.5 to 2% by wcigllt Or Ca, ~1, ctc. ~Ind residual iron or un~c~ctcd fcrlosilicon. Tllc com~)ollcnt WtliCIl hllS thc ef~ct llS a ~irc-~6~59~728 proofing matorial such ns a trough matorial is Si3N4 in whichthc metal iron of 10 to 15% is ovenly disl)erso~ in the form of particles. The mctul iron is oasily oxidized and generates lots of hcat. So, when ferrosilicon nitride as the trough materi~l is blended with the binding agent containing water it generates remarlclble heat, and if it is lcft to stand as it is, it dries up crisp and a portion thereof becomes too hurd to be used. From the above, the present inventors have found that it is possible to avoid said drawbacks by oxidizing the metal iron contained in the ferrosilicon nitride obtained by nitrogenizing ferrosilicon. In the method according to the present invention, by adding the diluted solution of acids, specially of inorganic acids to ferrosilicon nitride, the metal iron present in ferrosilicon nitride is converted into acid compounds such as, for example, iron chloride (FeC12) and iron sulfate (FeS04), and then the acid compounds of iron is converted into iron oxide, so-called rust, by air oxidization.
In the present invention, theIe may be used any acidic solutions of organic acid such as ncetic acid (C~13COOII), formic acid (IICOO~I), o~alic acld, taItaric acid or citric acid, or inorganic acids such as hydrochloric acid (HCl), sulfuric ~cid (112$04), ni-tric uci~ (IIN03), ~)hos~lloric acid, dicl~romic acid or chromi~ nci(l, ~u~ inorgallic acids Ul'e more eff~ctivo tlllln Ol`gnl)iC ncids, esI)ccinlly un n~luoous solution of hy(lrocllloric ncid or lli~l'iC IlCid iS onsy to us~ and off'oc tivo . ~n(~ O1'C Illl~y ~0 ~lso uso(l inor~llllic sl~lts such ~597Z~3 as NuCl, uluminum phosl)huto, ferric chlorido, ferric sulfate or aluminum sulrute. Molusses, ucidic pulp wasto fluid muy be also used.
Concentration of acids to be used should not be too thick so as to prevcnt elution of the component of ferrosilicon nitride. Hydrochloric acid, etc. added in the present invention work catalytically and ure desired to be thin, more specifically less than 30% by weight. The amount of said acid is preferable to fall in the runge of from 1 to 100 parts by weight to ferrosilicon nitride of 100 p~rts by weight. When the amount is less than 1 part by weight it is impossible to obtain complete acid compound, and when it exceeds 100 parts by weight surplus acid remains and an ufter-treatment becomes necessary.
So, the amount other than said above is not preferable.
Following the addition of acid, it is necessary to blend well and oxidize with air ut a temporature of from 50 to 200C.
Use of steam in the above treatment is further preferable to promote the effect. Said oxidation with air takes place together with the acid component .ln(l cun be carried GUt in quite a short time. For exnmple, -the once converted FeC13 is changed to Fe203 by oxidation with air. As described above ferrosilicon nitride obtuined by the present invention comprisos Si3N4 ~ Fo203 and a trough~material of good quality can bo o~taincd ~ithout generating heat at ull in the presencè
of molasses und phosphoric acid. Besides, in practicing the pre~ont invention blowing in of steum for plolllo~ting o~idution makos thc trcutmollt ho~lr short.
11~597213 ~. x l l m r~ -l (! I
Ferrosilicon nitride shown in Table 1 obtained by nitroge~ ing silicon nitri~e wus czushed to the mesh si~e of lcss than 150. Then, the prep~cd ferrosilicon nitride of 100 Kg was sufficiently blended with 30 Kg of an aqueous solution of hydrochloric acid having 2~o by weight density in an agitator. The blend wus subjected to the air oxidation at temperature of 90C for 20 hours and took out from the agitator for the purpose of a chemical unalysis. As shown in Tab`e 2, iron is ~imost converted into iron oxide.
Table 3 shows the property of ferrosilicon nitride prepared by the above method. It was observed by an exothermic test and an experimental production of the molten iron trough using molasses binding agent that the quality of the product prepared by the present invention is quite superior.
Tuble I
Constituent o~ ferrosilicon nitli(le before treatment (wt~) Si~N4 ¦ Fe - Si Fe ¦ F~03 Impurities containing __ . __ __ _. . . .. _ ~ . .
7~ 2~ 6~53 I ~ ~la _._ 4.28 Table 2 Constituent of ferrosilicon nitride after treatment (wt%) Si3N4 ¦ Pe Si¦ Fe ¦ 2 3 ¦Cu~ Al, etc- _ 72.18 1 6-28 1 1-69 1 15-68 1 4.02 _ __ _ . _ .. ... _ ... , . .. _ . . .. . .. , .. . .~ .. . . . _ ... . .. ... . _ . _.. _ _ _ ._ ~ ~597Z~3 ~ t)l~ 3 Exothermic tcst r~sults _ _ ... ~ !
Exothcrmic t~mp. (C) _ _ Present product 1.5 .__~_ Untreutcd ~roduct 31.5 Note: This exothermic test was curried cut by udding 120 g Or u 50~ u(lueous solution of molusscs to 1 Kg of ferrosilicon nitride powdeI prep~red by crushing to the mesh size of less than 150, blending sufficiently, filling in a thermosbottle of 1.2 - 1.3 capacity, inserting a Beckmann thermometer into the bottle for measuring the temperature of the ~lend for 24 hours, and reuding the difference between the highest temperuture and the room tcmperature.
.~ample 2 The exothermic temperature of the ferrosilicon nitride powder, S0% of which huvc u size of less than 74 jU, was 56.5C.
To 80 Kg of the ferrosilicon nitride powder was added 12~ of dilute ll~ydrochloric llcid (I : 50) ~nd blended. Then the blend was hcatc(l from the outsidc by steam, blown steam therein, and provi~ui lhree sm~ll holc~. It was then put into u vessel of loo~ c ,.~ ci-ty ll~.Vil.g n r n to stir thc contcnts. Kccping the insi~lc tcml~cr;lt~lrc ,r tllc vc~scl ut 10() c~ 3 Kg/cm2 of StQnm WIIS ~lown illtO thc vcss~l, and thc flln was rotl~tc(l ut u spced o~ 6 r.l).m. kQQpillg tilc rclutivc humidity ~t 90 to 100 , ~g7~8 ~ s sho~n in Fig. 1, af-ter 5 hours treutmcnt, the blend wus dried to obtain the rcrrosiliccn nit~i~e having thc cxothermic temperuture Or 6.0C. The amount of chlorine present in ferrosilicon nitride before and after the trcatment was 0.05% by weight and 0.10~ by weight respectively, indicating that the increase of chlorine was very small.
Examples 3 to 19 The following Examples were carried out using various .
additives by thc same method as Exam~le 2.
Example Additives Exothermic _ Nos. temp. ai'ter kind density treatment 3 sulfuric (1:50) 7.8 acid 4 ~litl`:iC 1~ 12.3 acid phosphoric ,l 6.
acid 6 dichromic .. 6. æ Ferrosilicon acid nitride which has not been treated 7 chromic .. 8.8 has the exothermic acid temperature of 8 acetic .. 8.4 acid The amount o~ each g oxcadic (1:50) 11.6 12 ~/batch.
The trea-ted amount formic ~- 10.`6 of the ferrosilicon aci(l nitride powder is 80 Kg/b~tch.
11 tarturic n 8.4 acid The treuting timc 12 citric ll 7.6 Exunnl)les 4 to 13 a c i l1 o thc r s 13 molusscs (1:10) 1.7 ,.,,, Continucd 011 n~!xt l"'g~' 105~7Zt3 14 acidic pulp ;, 7.2 : wastc fluid ..
N~Cl (1:50) 23.1 16 aluminum .. 4.3 phosphate 17 ferric - 7.6 . chloride 18 ferric ,1 3.7 . sulfate 19 aluminum ,. 10.5 . sulf~t~ . _ .
~S97;~3 Tllis invcntion is conccrllcd wi~h a process for the manufacture of ferrosillcon nitride, more specifically, this invention is concerncd with a trcatmcnt with acid for producing fcrrosilicon nitride huving ~ silicon nitride content of 65 to 85~ by weight as the material for the molten iron trough in thc bLast furnuce system.
It has heretofore been known to use ferrosilicon nitride as the material for the molten iron trough in the blast furnace system. Ferrosilicon nitride, which is superior in heat-resisting, spailing proofing and slag-resisting properties, consists of silicon nitride pf 65 to 85% by weight, impurities containing 0.5 to 2~o by weight of Ca, ~1, etc. and residual iron or unreacted ferrosilicon. As the material for the molten iron trough in the blast furnacc system other than said ferrosilicon nitride, there is generally used a mixture which comprises as a main component, such refIactory substance as silicon carbi~e, carbon, aluminum oxide or silicon oxide and blending this m~in component with such an organic binding agent as tar or pitch, a water-so;lu~le binding agent, such a clay binding agent as clay or k~lulin, and furthermore such a bindillg agont as phosphoric acid or molasses. When ferrosilicon nitride is used as the trough material and blended with a binding agent, the quality of the trough produccd is lurgcly influcnccd by thè binding ~gent used.
Bccuusc, an organic ~indillg ugcrlt such as pitch OI' tar emits gusos of oifellsivc odor during thc opcrution or on exposure to henting. Wut~r-solu~ indillg agcnt rcpresontcd by polyvinyl ~L~S9728 alcohol is cxpcnsive. Whe~l ferrosilicon nitride us the trough muterial is blcn~cd with thc binding agcnt cont~ining water it generates remarkable heu-t, and if it is left to stand as it is, it dries up crisp and a portion thereof becomes too hard to be used. Accordingly, the disadvantage entailed here is a basic problem which issues from the composition of ferro-silicon nitride.
The present inventors studied in looking for the development of ferrosilicon nitride for the molten iron trough by using a w~ter containing binding agent. They discovered that the present treatment for obtaining ferrosilicon nitridc of fine quality is very useful in the related industry in points of dissolving the drawbacks of generation of heat in using a binding agent containing water therein. That is, this invention is characterized by adding acid, more preferably the diluted solution of acid of 1 to 100 parts by weight to ferrosilicon nitride of 100 parts by wcight, blending well ~nd then subjecting the mixture to the air oxidation at temperature of 50 to 200C.
Fig. 1 i5 a graph showing the relation between the treatillg hours and the gencration of heat observ~d when ferrosilicon nitride was treated with dilute hydrochloric acid.
Ferrosilicon nitride consists of silicon ni-tri(le (Si3N~) of 65 to 85~ by wcight, impuritios contuining 0.5 to 2% by wcigllt Or Ca, ~1, ctc. ~Ind residual iron or un~c~ctcd fcrlosilicon. Tllc com~)ollcnt WtliCIl hllS thc ef~ct llS a ~irc-~6~59~728 proofing matorial such ns a trough matorial is Si3N4 in whichthc metal iron of 10 to 15% is ovenly disl)erso~ in the form of particles. The mctul iron is oasily oxidized and generates lots of hcat. So, when ferrosilicon nitride as the trough materi~l is blended with the binding agent containing water it generates remarlclble heat, and if it is lcft to stand as it is, it dries up crisp and a portion thereof becomes too hurd to be used. From the above, the present inventors have found that it is possible to avoid said drawbacks by oxidizing the metal iron contained in the ferrosilicon nitride obtained by nitrogenizing ferrosilicon. In the method according to the present invention, by adding the diluted solution of acids, specially of inorganic acids to ferrosilicon nitride, the metal iron present in ferrosilicon nitride is converted into acid compounds such as, for example, iron chloride (FeC12) and iron sulfate (FeS04), and then the acid compounds of iron is converted into iron oxide, so-called rust, by air oxidization.
In the present invention, theIe may be used any acidic solutions of organic acid such as ncetic acid (C~13COOII), formic acid (IICOO~I), o~alic acld, taItaric acid or citric acid, or inorganic acids such as hydrochloric acid (HCl), sulfuric ~cid (112$04), ni-tric uci~ (IIN03), ~)hos~lloric acid, dicl~romic acid or chromi~ nci(l, ~u~ inorgallic acids Ul'e more eff~ctivo tlllln Ol`gnl)iC ncids, esI)ccinlly un n~luoous solution of hy(lrocllloric ncid or lli~l'iC IlCid iS onsy to us~ and off'oc tivo . ~n(~ O1'C Illl~y ~0 ~lso uso(l inor~llllic sl~lts such ~597Z~3 as NuCl, uluminum phosl)huto, ferric chlorido, ferric sulfate or aluminum sulrute. Molusses, ucidic pulp wasto fluid muy be also used.
Concentration of acids to be used should not be too thick so as to prevcnt elution of the component of ferrosilicon nitride. Hydrochloric acid, etc. added in the present invention work catalytically and ure desired to be thin, more specifically less than 30% by weight. The amount of said acid is preferable to fall in the runge of from 1 to 100 parts by weight to ferrosilicon nitride of 100 p~rts by weight. When the amount is less than 1 part by weight it is impossible to obtain complete acid compound, and when it exceeds 100 parts by weight surplus acid remains and an ufter-treatment becomes necessary.
So, the amount other than said above is not preferable.
Following the addition of acid, it is necessary to blend well and oxidize with air ut a temporature of from 50 to 200C.
Use of steam in the above treatment is further preferable to promote the effect. Said oxidation with air takes place together with the acid component .ln(l cun be carried GUt in quite a short time. For exnmple, -the once converted FeC13 is changed to Fe203 by oxidation with air. As described above ferrosilicon nitride obtuined by the present invention comprisos Si3N4 ~ Fo203 and a trough~material of good quality can bo o~taincd ~ithout generating heat at ull in the presencè
of molasses und phosphoric acid. Besides, in practicing the pre~ont invention blowing in of steum for plolllo~ting o~idution makos thc trcutmollt ho~lr short.
11~597213 ~. x l l m r~ -l (! I
Ferrosilicon nitride shown in Table 1 obtained by nitroge~ ing silicon nitri~e wus czushed to the mesh si~e of lcss than 150. Then, the prep~cd ferrosilicon nitride of 100 Kg was sufficiently blended with 30 Kg of an aqueous solution of hydrochloric acid having 2~o by weight density in an agitator. The blend wus subjected to the air oxidation at temperature of 90C for 20 hours and took out from the agitator for the purpose of a chemical unalysis. As shown in Tab`e 2, iron is ~imost converted into iron oxide.
Table 3 shows the property of ferrosilicon nitride prepared by the above method. It was observed by an exothermic test and an experimental production of the molten iron trough using molasses binding agent that the quality of the product prepared by the present invention is quite superior.
Tuble I
Constituent o~ ferrosilicon nitli(le before treatment (wt~) Si~N4 ¦ Fe - Si Fe ¦ F~03 Impurities containing __ . __ __ _. . . .. _ ~ . .
7~ 2~ 6~53 I ~ ~la _._ 4.28 Table 2 Constituent of ferrosilicon nitride after treatment (wt%) Si3N4 ¦ Pe Si¦ Fe ¦ 2 3 ¦Cu~ Al, etc- _ 72.18 1 6-28 1 1-69 1 15-68 1 4.02 _ __ _ . _ .. ... _ ... , . .. _ . . .. . .. , .. . .~ .. . . . _ ... . .. ... . _ . _.. _ _ _ ._ ~ ~597Z~3 ~ t)l~ 3 Exothermic tcst r~sults _ _ ... ~ !
Exothcrmic t~mp. (C) _ _ Present product 1.5 .__~_ Untreutcd ~roduct 31.5 Note: This exothermic test was curried cut by udding 120 g Or u 50~ u(lueous solution of molusscs to 1 Kg of ferrosilicon nitride powdeI prep~red by crushing to the mesh size of less than 150, blending sufficiently, filling in a thermosbottle of 1.2 - 1.3 capacity, inserting a Beckmann thermometer into the bottle for measuring the temperature of the ~lend for 24 hours, and reuding the difference between the highest temperuture and the room tcmperature.
.~ample 2 The exothermic temperature of the ferrosilicon nitride powder, S0% of which huvc u size of less than 74 jU, was 56.5C.
To 80 Kg of the ferrosilicon nitride powder was added 12~ of dilute ll~ydrochloric llcid (I : 50) ~nd blended. Then the blend was hcatc(l from the outsidc by steam, blown steam therein, and provi~ui lhree sm~ll holc~. It was then put into u vessel of loo~ c ,.~ ci-ty ll~.Vil.g n r n to stir thc contcnts. Kccping the insi~lc tcml~cr;lt~lrc ,r tllc vc~scl ut 10() c~ 3 Kg/cm2 of StQnm WIIS ~lown illtO thc vcss~l, and thc flln was rotl~tc(l ut u spced o~ 6 r.l).m. kQQpillg tilc rclutivc humidity ~t 90 to 100 , ~g7~8 ~ s sho~n in Fig. 1, af-ter 5 hours treutmcnt, the blend wus dried to obtain the rcrrosiliccn nit~i~e having thc cxothermic temperuture Or 6.0C. The amount of chlorine present in ferrosilicon nitride before and after the trcatment was 0.05% by weight and 0.10~ by weight respectively, indicating that the increase of chlorine was very small.
Examples 3 to 19 The following Examples were carried out using various .
additives by thc same method as Exam~le 2.
Example Additives Exothermic _ Nos. temp. ai'ter kind density treatment 3 sulfuric (1:50) 7.8 acid 4 ~litl`:iC 1~ 12.3 acid phosphoric ,l 6.
acid 6 dichromic .. 6. æ Ferrosilicon acid nitride which has not been treated 7 chromic .. 8.8 has the exothermic acid temperature of 8 acetic .. 8.4 acid The amount o~ each g oxcadic (1:50) 11.6 12 ~/batch.
The trea-ted amount formic ~- 10.`6 of the ferrosilicon aci(l nitride powder is 80 Kg/b~tch.
11 tarturic n 8.4 acid The treuting timc 12 citric ll 7.6 Exunnl)les 4 to 13 a c i l1 o thc r s 13 molusscs (1:10) 1.7 ,.,,, Continucd 011 n~!xt l"'g~' 105~7Zt3 14 acidic pulp ;, 7.2 : wastc fluid ..
N~Cl (1:50) 23.1 16 aluminum .. 4.3 phosphate 17 ferric - 7.6 . chloride 18 ferric ,1 3.7 . sulfate 19 aluminum ,. 10.5 . sulf~t~ . _ .
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for the manufacture of ferrosilicon nitride for use in the molten iron trough in the blast furnace system, characterized by blending a diluted solution of acid of 1 to 100 parts by weight and ferrosilicon nitride of 100 parts by weight, and subjecting the blend to air oxidation.
2. A process according to claim 1 wherein the ferro-silicon nitride is mixed in the presence of wet air and kept at temperature of 50 to 200°C.
3. A process according to claim 2 wherein the ferro-silicon nitride is blended with an inorganic acid selected from HCl, H2SO4, HNO3, H3PO4, H2Cr2O7 and H2CrO4, and kept at temperature of 50 to 200°C.
4. A process according to claim 2 wherein the ferro-silicon nitride is further blended with an organic acid selected from CH3COOH, H2C2O4, HCOOH, tartaric acid and citric acid, and kept at temperature of 50 to 200°C.
5. A process according to claim 2 wherein the ferro-silicon nitride is further blended with an inorganic salt selected from NaCl, aluminum phosphate, ferric chloride, ferric sulfate and aluminum sulfate, and kept at temperature of 50 to 200°C.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50057820A JPS51133197A (en) | 1975-05-15 | 1975-05-15 | The processing technique of the nitrided ferrosilicon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059728A true CA1059728A (en) | 1979-08-07 |
Family
ID=13066546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA252,339A Expired CA1059728A (en) | 1975-05-15 | 1976-05-12 | Process for manufacture of ferrosilicon nitride |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS51133197A (en) |
| CA (1) | CA1059728A (en) |
| DE (1) | DE2621584C3 (en) |
| FR (1) | FR2310961A1 (en) |
| GB (1) | GB1495899A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE237436C (en) * | ||||
| JPS4930607A (en) * | 1972-07-27 | 1974-03-19 | ||
| FR2281905A1 (en) * | 1974-08-14 | 1976-03-12 | Denki Kagaku Kogyo Kk | Ferrosilicon nitride prodn. for use in metallurgy - by nitriding ferrosilicon with nitrogen and treating with water to remove impurities |
-
1975
- 1975-05-15 JP JP50057820A patent/JPS51133197A/en active Granted
-
1976
- 1976-05-11 GB GB1929776A patent/GB1495899A/en not_active Expired
- 1976-05-12 CA CA252,339A patent/CA1059728A/en not_active Expired
- 1976-05-13 FR FR7614422A patent/FR2310961A1/en active Pending
- 1976-05-14 DE DE19762621584 patent/DE2621584C3/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1495899A (en) | 1977-12-21 |
| FR2310961A1 (en) | 1976-12-10 |
| DE2621584C3 (en) | 1979-01-18 |
| JPS5537485B2 (en) | 1980-09-29 |
| DE2621584A1 (en) | 1976-12-02 |
| JPS51133197A (en) | 1976-11-18 |
| DE2621584B2 (en) | 1978-05-24 |
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