CN107460313A - A kind of nickel slag forming starchy binder and the method for preparing nickel slag type ball - Google Patents
A kind of nickel slag forming starchy binder and the method for preparing nickel slag type ball Download PDFInfo
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- CN107460313A CN107460313A CN201710532131.8A CN201710532131A CN107460313A CN 107460313 A CN107460313 A CN 107460313A CN 201710532131 A CN201710532131 A CN 201710532131A CN 107460313 A CN107460313 A CN 107460313A
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- Prior art keywords
- nickel slag
- type ball
- oxidized starch
- value
- mass content
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
Abstract
The invention discloses a kind of nickel slag forming starchy binder and the method for preparing nickel slag type ball.The binding agent includes xanthans and oxidized starch, and the mass content of xanthans is 30~50%, and the mass content of oxidized starch is 50~70%, and the oxidized starch is prepared by the following method：(1) pH value of the farina slurries that concentration is 18~25 ° of B é is adjusted to 8.0~9.0；(2) sodium hypochlorite is added into the farina slurries after regulation pH value, the sodium hypochlorite dosage is the 5~15% of potato starch pulp liquid product, and 1~1.5h is reacted at 35~55 DEG C；(3) pH value of reacted farina slurries is adjusted to 6.0~6.5；(4) excessive sodium hypochlorite is reduced with sodium sulfite, then is centrifuged, washed, dried, obtains described oxidized starch.Nickel slag forming starchy binder cost disclosed by the invention is cheap, technique is simple, economic benefit is good, and the method for preparing nickel slag type ball reduces the requirement to equipment, saves drying grate device, substantially reduces energy consumption, improves production capacity.
Description
Technical field
Present invention relates generally to metallurgical material field, and in particular to a kind of nickel slag forming starchy binder and prepares nickel slag
The method of type ball.
Background technology
Nickel slag is caused a kind of solid slag in metallic nickel and nickel alloy smelting process, i.e., its high-temperature molten is through water quenching
A kind of granulated slag formed afterwards, its chemical composition have larger difference because of ore source and the difference of smelting process.Wherein SiO2
Content 30%-50%, Fe2O3Content 30%-60%, CaO content 1.5%-5%, content of MgO 1%-15%, Al2O3Content
2.5%-6%.Compared with granulated blast-furnace slag, CaO, MgO and Al2O3Content is much lower, but SiO2And Fe2O3Content is much higher,
Therefore its activity is lower, is also more difficult to grind, meanwhile, also difficult shaping.
At present, nickel slag is used for filling in mine, construction material and valuable metal recovery etc..But due in nickel slag
Iron mainly exists in the form of pyroxene and olivine, and the clinker of this structure is difficult to carry out richness to iron therein in a manner of magnetic separation
Collection.So iron resource generally use reducing process is extracted from nickel slag.And due in nickel slag ferriferous oxide mutually wrapped up by quartzy, by force
Spend higher, compact structure, it is difficult to which being reduced property gas is penetrated, it is therefore necessary at a higher temperature by solid C reducing agents institute
Reduction.Iron resource is extracted using reducing process, it is main to consider its agglomeration (sintering or pelletizing), directly enter stove instead of iron ore or
It is to use carbonaceous reducing agent by its drastic reduction for iron, then carries out ore grinding and magnetic separation detached job, to a certain extent can be real
Iron resource and other mineral efficiently separates in existing nickel slag.
During pelletizing production, binding agent is an indispensable part, and weight is produced to preparation process and pellet quality
Influence.Therefore, in order to not influenceed the nickel slag pelletizing (i.e. type ball) of sequential reduction processing, this area, which needs one kind badly, to be
Prepare the binding agent needed for nickel slag pelletizing.
The content of the invention
In view of the above problems, it is an object of the invention to provide the nickel that a kind of cost is cheap, technique is simple, economic benefit is good
Slag forming starchy binder and the method for preparing nickel slag type ball.Nickel slag forming starchy binder raw material provided by the invention is easy
, preparation method is simple, and in the method for preparing nickel slag type ball, the binding agent addition is few, and cost is relatively low, introduce impurity compared with
It is few, the Iron grade of sequential reduction processing is not influenceed.The nickel slag type ball prepared simultaneously can greatly improve type ball machinery after drying is strong
Degree, ensure that the type ball after having bad luck and entering stove is not damaged, dust pollution is few.
The invention provides a kind of nickel slag forming starchy binder, wherein, the binding agent includes xanthans and oxidation is formed sediment
Powder, the mass content of the xanthans is 30~50%, and the mass content of the oxidized starch is 50~70%.
The oxidized starch is prepared by the following method：(1) the farina slurries that concentration is 18~25 ° of B é are adjusted
PH value is to 8.0~9.0；(2) sodium hypochlorite, the sodium hypochlorite dosage are added into the farina slurries after regulation pH value
5~15% accumulated for the potato starch pulp liquid, 1~1.5h is reacted at 35~55 DEG C；(3) reacted Ma Ling is adjusted
The pH value of sweet potato starch slurries is to 6.0~6.5；(4) excessive sodium hypochlorite is reduced with sodium sulfite, then is centrifuged, washed, done
It is dry, obtain described oxidized starch.
Preferably, according to above-mentioned nickel slag forming starchy binder, wherein, in the preparation method of the oxidized starch,
Step (1) adjusts pH value using 3% sodium hydroxide；3% salt acid for adjusting pH value is used in step (3).
It is highly preferred that according to above-mentioned nickel slag forming starchy binder, wherein, in the preparation method of the oxidized starch
In, available chlorine content is 10~13% in sodium hypochlorite described in step (2).
More preferably, according to above-mentioned nickel slag forming starchy binder, wherein, in the preparation method of the oxidized starch
In, the biodiversity content of the oxidized starch is less than 14%.
Or preferably, according to above-mentioned nickel slag forming starchy binder, wherein, the viscosity of xanthan gums 1200~
1600mPas, granularity≤0.18mm, pH value 6.0~8.0, moisture content mass content≤13%, ash mass content≤13%.
Present invention also offers a kind of method that nickel slag type ball is prepared using above-mentioned binding agent, wherein, methods described bag
Include：According to mass ratio it is 1 by nickel slag, reducing agent and the binding agent：0.31~0.36：0.005~0.02 stirring, is well mixed
Mixture is obtained, the mixture is put into two pairs of rollers ball press, it is compressing to obtain the nickel slag type ball.
Preferably, according to the above method, wherein, the weight of iron content of the nickel slag<40%, nickel mass content<0.4%,
Biodiversity content<2%, granularity<0.15mm.
Or preferably, according to the above method, wherein, the reducing agent is the mixture of coal and lime stone, and mass ratio is
(1.4~2.1)：1.
It is highly preferred that according to above-mentioned nickel slag type ball, wherein, the carbon mass content of the coal is 68-73%, lime stone
Calcium mass content >=50%.
Nickel slag forming starchy binder cost provided by the invention is cheap, technique is simple, economic benefit is good.Wherein, use
Oxidized starch preparation method it is easy, cheap, mobility is big, can form the cohesive force of high dispersive between powder, with excellent
Good bonding strength；The xanthans of use has prominent high viscosity and water solubility, and thickening, Efficient Adhesive Promotion are notable, by pH value shadow
Ring seldom, keep its original viscosity and performance substantially in the range of -18~120 DEG C, be used in mixed way, can extend with oxidized starch
Its ageing time, it is still in stable state to make its storage long period.
The method provided by the invention for preparing nickel slag type ball reduces the requirement to equipment, saves drying grate device, significantly
Energy consumption is reduced, improves production capacity.And utilize the nickel slag type ball warp of nickel slag, reducing agent and the preparation of nickel slag forming starchy binder to mix,
Shaping, the molten office reason of reduction can obtain high grade iron resource.
Embodiment
With reference to embodiments, the embodiment of the present invention is described in more details, so as to more preferably
Ground understands the advantages of the solution of the present invention and its various aspects.However, specific embodiments described below and embodiment are only
It is for illustrative purposes, rather than limitation of the present invention.
The invention provides a kind of nickel slag forming starchy binder, wherein, the binding agent includes xanthans and oxidation is formed sediment
Powder, the mass content of the xanthans is 30-50%, and the mass content of the oxidized starch is 50-70%.
The oxidized starch is prepared by the following method：
(1) pH value for the farina slurries that concentration is 18~25 ° of B é is adjusted to 8.0~9.0, can be fitted under the concentration
When the utilization rate and yield that improve equipment, the slurry pH value causes the reaction time to shorten；
(2) sodium hypochlorite is added into the farina slurries after regulation pH value, the sodium hypochlorite dosage is described
The 5~15% of potato starch pulp liquid product, react 1~1.5h, if reaction temperature is too high, starch at 35~55 DEG C
Grain gelatinization expansion, influences the progress of reaction, and the salt produced is difficult to remove with chlorion, and reaction temperature is too low, then reacts
Speed is slow, is unfavorable for improving yield, and sodium hypochlorite is easy to be reduced into solable matter in oxidizing process, in cleaning process easily
It is few in removal, residual chemical agents；
(3) pH value of reacted farina slurries is adjusted to 6.0~6.5；
(4) excessive sodium hypochlorite is reduced with sodium sulfite, then is centrifuged, washed, dried, described oxidation is obtained and forms sediment
Powder.
In one embodiment, in the preparation method of the oxidized starch, step (1) uses 3% sodium hydroxide
Adjust pH value；3% salt acid for adjusting pH value is used in step (3).
In one embodiment, in the preparation method of the oxidized starch, have described in step (2) in sodium hypochlorite
It is 10~13% to imitate chlorinity.In one embodiment, in the preparation method of the oxidized starch, the oxidized starch
Biodiversity content is less than 14%.
The preparation method of the oxidized starch is easy, and prepared oxidized starch is cheap, and mobility is big, can be between powder
The cohesive force of high dispersive is formed, there is excellent bonding strength.
In one embodiment, the 1200~1600mPas of viscosity of xanthan gums, granularity≤0.18mm, pH value 6.0
~8.0, moisture content mass content≤13%, ash mass content≤13%.The xanthans has prominent high viscosity and water-soluble
Property, thickening, Efficient Adhesive Promotion it is notable, influenceed seldom by pH value, kept substantially in the range of -18~120 DEG C its original viscosity with
Performance, it is used in mixed way with oxidized starch, its ageing time can be extended, it is still in stable state to make its storage long period.
Present invention also offers a kind of method that nickel slag type ball is prepared using above-mentioned binding agent, wherein, methods described bag
Include：According to mass ratio it is 1 by nickel slag, reducing agent and the binding agent：0.31~0.36：0.005~0.02 stirring, is well mixed
Mixture is obtained, the mixture is put into two pairs of rollers ball press, it is compressing to obtain the nickel slag type ball.It is wherein compressing
Pressure be 10~15MPa.The moulding process of the nickel slag type ball reduces the requirement to equipment, saves drying grate device, significantly
Energy consumption is reduced, improves production capacity.
In one embodiment, the mass ratio of the nickel slag, the reducing agent and the nickel slag forming starchy binder
For 1：0.31-0.36：0.005-0.02.The addition of the nickel slag forming starchy binder is few, and cost is relatively low, introduce impurity compared with
It is few, the Iron grade of sequential reduction processing is not influenceed.
In one embodiment, the weight of iron content of the nickel slag<40%, nickel mass content<0.4%, biodiversity
Content<2%, granularity<0.15mm.
In one embodiment, the reducing agent is the mixture of coal and lime stone, and mass ratio is (1.4~2.1)：1.
In one embodiment, the carbon mass content of the coal is 68-73%, the calcium mass content of lime stone >=
50%.
The nickel slag type ball of preparation can greatly improve the mechanical strength of type ball after drying, ensure that the type after having bad luck and entering stove
Ball is not damaged, and dust pollution is few.
Embodiment 1
A kind of type ball using nickel slag as primary raw material, including nickel slag raw material that Iron grade is 40%, reducing agent and for gluing
Tie the nickel slag forming starchy binder for stating nickel slag and reducing agent.
The described type ball using nickel slag as primary raw material, its preparation method are：
It is 2% by biodiversity content, the coal that granularity ＜ 0.15mm 1000g nickel slag, 210g carbon mass contents are 68%
Powder, the lime stone and 5g nickel slag forming starchy binders that 100g calcium mass content is 50%, uniform stirring mixing, by above-mentioned mixing
Thing is put into two pairs of rollers ball press, compressing under pressure 15MPa, that is, is molded ball.
Described nickel slag forming starchy binder, including the raw material matched as follows according to percentage by weight：
Hypochlorite oxidation starch 50%, xanthans 50%, the gross weight number of above-mentioned total raw material is 100 percent.
The preparation method of described nickel slag forming starchy binder is：
Farina is uniformly tuned into slurries of the concentration for 25 ° of B é, farinaceous size is inserted in reactor, adds 3%
Sodium hydroxide be adjusted to pH value as 8, add the sodium hypochlorite that 5% chlorinty is 10%, 1h reacted at 55 DEG C, then with 3%
Hydrochloric acid be adjusted to pH value as 6.5, adding appropriate sodium sulfite solution makes oxidant reduction, and centrifuging and repeatedly washed with clear water will be miscellaneous
Matter removes, and dries and controls moisture that hypochlorite oxidation starch is made below 14%.
2.5g hypochlorite oxidation starch is weighed, 2.5g xanthans, it is nickel slag to be put into uniform stirring mixing in batch mixer
It is molded starchy binder.
Above-mentioned gained type ball mean compressive strength≤92N, average drop strength is 5 times/；After 105 DEG C dry 4h, type
Ball mean compressive strength≤236N, average drop strength is 16 times/.
Embodiment 2
A kind of type ball using nickel slag as primary raw material, including nickel slag raw material that Iron grade is 39%, reducing agent and for gluing
Tie the nickel slag forming starchy binder for stating nickel slag and reducing agent.
The described type ball using nickel slag as primary raw material, its preparation method are：
Be 1.6% by biodiversity content, granularity ＜ 0.15mm 1000g nickel slag, 210g carbon mass contents be 73%
Coal dust and lime stone and 20g nickel slag forming starchy binders that 150g calcium mass content is 60%, uniform stirring mixing will be above-mentioned
Mixture is put into two pairs of rollers ball press, compressing under pressure 15MPa, that is, is molded ball.
Described nickel slag forming starchy binder, including the raw material matched as follows according to percentage by weight：
Hypochlorite oxidation starch 70%, xanthans 30%, the gross weight number of above-mentioned total raw material is 100 percent.
The preparation method of described nickel slag forming starchy binder is：
Farina is uniformly tuned into slurries of the concentration for 25 ° of B é, farinaceous size is inserted in reactor, adds 3%
Sodium hydroxide be adjusted to pH value as 9, add the sodium hypochlorite that 15% chlorinty is 13%, 1.5h, Ran Houyong reacted at 40 DEG C
It is 6.5 that 3% hydrochloric acid, which is adjusted to pH value, and adding appropriate sodium sulfite solution makes oxidant reduction, centrifuges and is simultaneously repeatedly washed with clear water
By impurity removal, dry and control moisture that hypochlorite oxidation starch is made below 13%.
14g hypochlorite oxidation starch is weighed, 6g xanthans, it is nickel slag forming to be put into uniform stirring mixing in batch mixer
Starchy binder.
Above-mentioned gained type ball mean compressive strength≤135N, average drop strength is 10 times/；After 105 DEG C dry 4h,
Type ball mean compressive strength≤355N, average drop strength is 20 times/.
Embodiment 3
A kind of type ball using nickel slag as primary raw material, including nickel slag raw material that Iron grade is 35%, reducing agent and for gluing
Tie the nickel slag forming starchy binder for stating nickel slag and reducing agent.
The described type ball using nickel slag as primary raw material, its preparation method are：
It is 1% by biodiversity content, the coal that granularity ＜ 0.15mm 1000g nickel slag, 210g carbon mass contents are 70%
Powder and lime stone and 10g nickel slag forming starchy binders that 150g calcium mass content is 55%, uniform stirring mixing will be above-mentioned mixed
Compound is put into two pairs of rollers ball press, compressing under pressure 15MPa, that is, is molded ball.
Described nickel slag forming starchy binder, including the raw material matched as follows according to percentage by weight：
Hypochlorite oxidation starch 60%, xanthans 40%, the gross weight number of above-mentioned total raw material is 100 percent；
The preparation method of described nickel slag forming starchy binder is：
Farina is uniformly tuned into slurries of the concentration for 20 ° of Be, farinaceous size is inserted in reactor, adds 3%
Sodium hydroxide be adjusted to pH value as 8, add the sodium hypochlorite that 10% chlorinty is 12%, 1.5h, Ran Houyong reacted at 35 DEG C
It is 6 that 3% hydrochloric acid, which is adjusted to pH value, and adding appropriate sodium sulfite solution makes oxidant reduction, and centrifuging and repeatedly washed with clear water will
Impurity removal, dry and control moisture that hypochlorite oxidation starch is made below 10%.
6g hypochlorite oxidation starch is weighed, 4g xanthans, it is nickel slag forming to be put into uniform stirring mixing in batch mixer
Starchy binder.
Above-mentioned gained type ball mean compressive strength≤109N, average drop strength is 7 times/；After 105 DEG C dry 4h,
Type ball mean compressive strength≤296N, average drop strength is 18 times/.
Comparative example 1
A kind of type ball using nickel slag as primary raw material, including nickel slag raw material that Iron grade is 35%, reducing agent and for gluing
Tie the binding agent for stating nickel slag and reducing agent.
The described type ball using nickel slag as primary raw material, its preparation method are：
Be 1% by moisture, the coal dust that granularity ＜ 0.15mm 1000g nickel slag, 210g carbon mass contents are 70% and
The lime stone and 20g molasses that 150g calcium mass content is 55%, uniform stirring mixing, two pairs of rollers ball press are put into by said mixture
In, it is compressing under pressure 15MPa, that is, it is molded ball.
Above-mentioned gained type ball mean compressive strength≤75N, average drop strength is 4 times/；After 105 DEG C dry 4h, type
Ball mean compressive strength≤65N, average drop strength is 6 times/.
Comparative example 2
A kind of type ball using nickel slag as primary raw material, including nickel slag raw material that Iron grade is 35%, reducing agent and for gluing
Tie the binding agent for stating nickel slag and reducing agent.
The described type ball using nickel slag as primary raw material, its preparation method are：
Be 1% by moisture, the coal dust that granularity ＜ 0.15mm 1000g nickel slag, 210g carbon mass contents are 70% and
The lime stone and 20g bentonites that 150g calcium mass content is 55%, uniform stirring mixing, two pairs of rollers pressure ball are put into by said mixture
It is compressing under pressure 15MPa in machine, that is, it is molded ball.
Above-mentioned gained type ball mean compressive strength≤68N, average drop strength is 3 times/；After 105 DEG C dry 4h, type
Ball mean compressive strength≤89N, average drop strength is 5 times/.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the field, can also do on the basis of the above description
Go out other various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
Among the obvious changes or variations that Shen goes out is still in protection scope of the present invention.
Claims (9)
1. a kind of nickel slag forming starchy binder, it is characterised in that the binding agent includes xanthans and oxidized starch, the Huang
The mass content of virgin rubber is 30~50%, and the mass content of the oxidized starch is 50~70%,
The oxidized starch is prepared by the following method：
(1) pH value of the farina slurries that concentration is 18~25 ° of B é is adjusted to 8.0~9.0；
(2) sodium hypochlorite is added into the farina slurries after regulation pH value, the sodium hypochlorite dosage is the Ma Ling
The 5~15% of sweet potato starch slurry volume, 1~1.5h is reacted at 35~55 DEG C；
(3) pH value of reacted farina slurries is adjusted to 6.0~6.5；
(4) excessive sodium hypochlorite is reduced with sodium sulfite, then is centrifuged, washed, dried, obtains described oxidized starch.
2. nickel slag forming starchy binder according to claim 1, it is characterised in that in the preparation side of the oxidized starch
In method, step (1) adjusts pH value using 3% sodium hydroxide；3% salt acid for adjusting pH value is used in step (3).
3. nickel slag forming starchy binder according to claim 2, it is characterised in that in the preparation side of the oxidized starch
In method, available chlorine content is 10~13% in sodium hypochlorite described in step (2).
4. the nickel slag forming starchy binder according to Claims 2 or 3, it is characterised in that the moisture of the oxidized starch
Mass content is less than 14%.
5. nickel slag forming starchy binder according to claim 1, it is characterised in that the viscosity of xanthan gums 1200~
1600mPas, granularity≤0.18mm, pH value 6.0~8.0, moisture content mass content≤13%, ash mass content≤13%.
6. a kind of utilize the method that any described binding agent prepares nickel slag type ball in Claims 1 to 55, it is characterised in that institute
The method of stating includes：According to mass ratio it is 1 by nickel slag, reducing agent and the binding agent：0.31~0.36：0.005~0.02 stirring,
It is well mixed to obtain mixture, the mixture is put into two pairs of rollers ball press, it is compressing to obtain the nickel slag type ball.
7. the method according to claim 6 for preparing nickel slag type ball, it is characterised in that the weight of iron content of the nickel slag<
40%, nickel mass content<0.4%, biodiversity content<2%, granularity<0.15mm.
8. the method according to claim 6 for preparing nickel slag type ball, it is characterised in that the reducing agent is coal and lime stone
Mixture, mass ratio is (1.4~2.1)：1.
9. the method according to claim 8 for preparing nickel slag type ball, it is characterised in that the carbon mass content of the coal is
68-73%, calcium mass content >=50% of lime stone.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710532131.8A CN107460313A (en) | 2017-07-03 | 2017-07-03 | A kind of nickel slag forming starchy binder and the method for preparing nickel slag type ball |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710532131.8A CN107460313A (en) | 2017-07-03 | 2017-07-03 | A kind of nickel slag forming starchy binder and the method for preparing nickel slag type ball |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724084A (en) * | 2009-12-18 | 2010-06-09 | 张雷达 | Method capable of keeping whiteness of heated oxidized starch |
| CN105483370A (en) * | 2015-11-30 | 2016-04-13 | 滦县永恒粘合剂有限公司 | Drying-free bonding agent for iron powder cold pressing pellets |
-
2017
- 2017-07-03 CN CN201710532131.8A patent/CN107460313A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724084A (en) * | 2009-12-18 | 2010-06-09 | 张雷达 | Method capable of keeping whiteness of heated oxidized starch |
| CN105483370A (en) * | 2015-11-30 | 2016-04-13 | 滦县永恒粘合剂有限公司 | Drying-free bonding agent for iron powder cold pressing pellets |
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