CN103911484A - Preparation method for passivated granular magnesium used for steel smelting - Google Patents
Preparation method for passivated granular magnesium used for steel smelting Download PDFInfo
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- CN103911484A CN103911484A CN201410041151.1A CN201410041151A CN103911484A CN 103911484 A CN103911484 A CN 103911484A CN 201410041151 A CN201410041151 A CN 201410041151A CN 103911484 A CN103911484 A CN 103911484A
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Abstract
The invention relates to the field of material processing, especially to a preparation method for passivated granular magnesium used for steel smelting. The method comprises the following steps: putting metallic magnesium powder with a particle size of 20 to 80 meshes into a conical mixer; starting a passivating agent pump, injecting a magnesium chloride passivating agent into the conical mixer and carrying out stirring during injection; after continuous injection and stirring for 20 to 30 min, sprinkling a drying agent--pulverized limestone into the conical mixer and carrying out uniform mixing during sprinkling; continuing stirring for 3 to 5 min; starting a discharging vibrating screen, opening the discharge valve of the conical mixer and discharging the prepared passivated granular magnesium onto a cooling material disk; and uniformly spreading the prepared passivated granular magnesium and naturally cooling the passivated granular magnesium to a temperature below 40 DEG C. The preparation method for passivated granular magnesium used for steel smelting is simple and has low cost. Utilization of the metallic magnesium powder with a large particle size of 20 to 80 meshes enables loss of metallic magnesium during processing to be reduced and dust floating in the air to be decreased and is beneficial for health of workers.
Description
Technical field
The present invention relates to material processing field, the preparation method in particular to a kind of smelting iron and steel with passivation particle magnesium.
Background technology
Passivation particle magnesium is mainly used in the deoxidization desulfuration production of iron and steel, this product is " ball-type " magnesium powder, little with its angle of repose, good fluidity, in deoxidization desulfuration, consumption is little, treatment time is short, speed of response is fast, and molten iron cooling is low, and the quantity of slag is little, the effective institute of deoxidization desulfuration is famous, and desulfurization depth is up to 0.004%.In industrial application, be often called as passivation particle magnesium.
Current common passivation particle magnesium is to be 200 order-500 object magnesium oxide or magnesium fluoride pulvis by wrap fineness on the surface of granular metal magnesium, to form anti oxidation layer, then is reacted generation passivation layer with passivator by this anti oxidation layer.Described passivator is to be made up of the aqueous solution of sodium-chlor, Repone K or magnesium chloride.
A kind of passivation particle magnesium is disclosed in reference paper 1, specifically be coated the anti-oxidant fire retardant material of one deck on the surface of granular magnesium, this anti-oxidant fire retardant material is the conventional fire retardant material of one deck fire-fighting, and between this material and granular magnesium, the tightness of combination is poor, easily comes off.
A kind of method of producing coating granule magnesium is disclosed in reference paper 2, the coating wherein using is the one in fine particle calcium carbonate, coarse whiting, light-burning magnesium powder, dolomite ash, calcium aluminate powder, calcined bauxite in powder, aluminium ash, silicon ash, wilkinite with powder, the cost of these materials is all relatively high, and the granularity of metal magnesium granule is 24-100 order, the fineness of magnesium is more inhomogeneous, the loss of starting material magnesium is more, and the dust producing in processing is larger, causes larger harm for operating personnel healthy.
In reference paper 3, disclose a kind of passivation particle magnesium and preparation method thereof, preparation method is wherein more complicated, and the passivation particle magnesium of preparation has moisture absorption, easily burning.And also needing to seal oxygen barrier in the time of storage, carrying cost is higher.
Reference paper:
1, passivation particle magnesium, [applicant] Zhongxing Magnesium Industry Co., Ltd., Zhengzhou, [publication number] CN2378399, [open day] 2000-05-17.
2, produce a method for coating granule magnesium, [applicant] Liaoning Fenghua non-ferrous metal Group Co.,Ltd, [publication number] CN102248172A, [open day] 2011-11-23.
3, a kind of passivation particle magnesium and preparation method thereof, [applicant] Long Yi army, [publication number] CN1485461, [open day] 2004-03-31.
Summary of the invention
The object of the present invention is to provide the preparation method of a kind of smelting iron and steel passivation particle magnesium, to solve the above problems.
The preparation method of a kind of smelting iron and steel passivation particle magnesium providing in an embodiment of the present invention, comprises the following steps:
Be that 20-80 object metal magnesium powder packs in circular cone mixing and blending machine by granularity;
Start passivator pump, in described circular cone mixing and blending machine, spray into magnesium chloride passivator, stir while spraying into;
Continue to spray into and stir after 20-30 minute, in described circular cone mixing and blending machine, being sprinkled into siccative lime powder, mixing while being sprinkled into;
Continue to stir 3-5 minute;
Start discharging reciprocating sieve, open the discharge gate of circular cone mixing and blending machine, by extremely cooling charging tray of the passivation particle magnesium discharging of making;
Shakeout, naturally cool to below 40 ℃.
According to a kind of smelting iron and steel passivation particle magnesium provided by the invention, preparation method is simple, with low cost.
Especially, use the relatively large 20-80 object metal magnesium powder of particle diameter that the loss of MAGNESIUM METAL in the course of processing reduced, dust floating in air is also less, is conducive to the healthy of operating personnel.
First spray into magnesium chloride passivator, make to form passive film on the surface of metal magnesium powder particle.
After 20-30 minute, all metal magnesium powder particle surfaces have substantially completed passivation, and substantially evenly passivation completely, now in circular cone mixing and blending machine, be sprinkled into siccative lime powder, Bian Sabian mixes, lime powder not only can be by unnecessary moisture absorption, can react with the water of the metal magnesium powder particle surface of passivation simultaneously, generate intermediate product calcium hydroxide, because this reaction is thermopositive reaction, waste heat makes the intermediate product formation shell generating brace the surface at metal magnesium powder particle, what now between passive film and metal magnesium powder particle, stick is more fastening, difficult drop-off.
Meanwhile, the lime powder that is attached to metal magnesium powder top layer has fire-retardant effect, can protect the metal magnesium powder in it can not burnt fast or be oxidized, and has improved the service efficiency of passivated magnesium particle.And the lime powder common tailing that is steelworks, be easy to get, and cheap, reduce the production cost of passivation particle magnesium.
By after complete siccative lime powder been sprayed, continue to stir 3-5 minute, make siccative as much as possible and the metal magnesium powder particle that has been passivated fully mixes.
After siccative been sprayed, start discharging reciprocating sieve, open circular cone mixing and blending machine discharge gate, by passivation particle magnesium discharging, the dispensing speed of controlling well makes deactivating magnesium powder pass through screen cloth, and the magnesium powder under sieve is finished product, pack the cooling charging tray of finished product into, shakeout, naturally cool to below 40 ℃.By its Packing Unit and fashionable dress bag in accordance with regulations, and properly sealing.
Accompanying drawing explanation
A kind of smelting iron and steel that Fig. 1 provides for embodiment of the present invention preparation method's schema of passivation particle magnesium powder.
Embodiment
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
The preparation method of passivation particle magnesium for a kind of smelting iron and steel as shown in Figure 1, comprises the following steps:
101. is that 20-80 object metal magnesium powder packs in circular cone mixing and blending machine by granularity;
Giving while packing metal magnesium powder in circular cone mixing and blending machine, feed according to following formula:
Circular cone mixing and blending machine charge amount is calculated: G=K × V × D
G is charging quality, units/kg; K is circular cone mixing machine coefficient of fullness; V is circular cone mixing machine mixing machine volume, the m of unit
3; D is magnesium powder bulk density or loose density, units/kg/m
3.
Before production, prepare to scale passivator.Require to use clean tap water.Accurately weigh by batch usage quantity, pack clean container into.
Accurately weigh siccative by batch usage quantity.
Check each Plant in good condition and carry out test run.
Be ready to required work, utensil.
Start passivation operation:
Wherein, metal magnesium powder is cutting granulation, and the purity that metal magnesium powder is magnesium is greater than or equal to 90%, and surface drying oxide-free, and no-sundries is sneaked into.
The granularity of metal magnesium powder can be 20-30 order, 30-40 order, 40-50 order, 50-60 order, 60-70 order, 70-80 order.
In order to improve the utilization ratio of metal magnesium powder, reduce the loss of metal magnesium powder in the course of processing, reduce the difficulty in preparation process, preferably, the granularity of metal magnesium powder is 60-80 order.
Because in the time that the granularity of metal magnesium powder is meticulous, need to use specific equipment to spray in preparation process; In the time that the granularity of metal magnesium powder is excessive, it is optimum that the effect of desulfating and deoxidation can not reach, so preferably, the granularity of metal magnesium powder is 60-70 order.
102. start passivator pump, in described circular cone mixing and blending machine, spray into magnesium chloride passivator, stir while spraying into.
Start passivator pump, first start rotation, rear startup revolution.The metal magnesium powder that first to start rotation and be in order to pack in circular cone mixing and blending machine can be installed in circular cone mixing and blending machine equably; Revolution, can mix equably with metal magnesium powder the follow-up magnesium chloride passivator packing in passivator pump afterwards.
Magnesium chloride passivator is that the magnesium chloride that is 85% by purity adds tap water, the saturated solution of making at normal temperatures.
Purity be the cost of 85% the magnesium chloride magnesium chloride that is 90% compared to purity cost 10-20%, and, the passivation particle magnesium that uses the lower magnesium chloride of purity to prepare by preparation method provided by the invention, can produce same beneficial effect, so, so also understand on the other hand, the cost of the passivation particle magnesium of preparing by preparation method provided by the invention is relatively low.
Wherein in giving and adding passivator in metal magnesium powder, carry out the adding of passivator of respective amount according to the purity of metal magnesium powder, in the time that the purity of metal magnesium powder is 90%, the add-on of passivator is 11-12%, in the time that the purity of metal magnesium powder is 92%, the add-on of passivator is 9-10%, and in the time that the purity of metal magnesium powder is 95%, the add-on of passivator is 7-8%.
While adding magnesium chloride passivator, can in circular cone mixing and blending machine, spray into, also can manually use watering can evenly to spray into.
In mixing process, note situation in observation machine, mix after 10 minutes, with waddy, the material that is bonded at mixing machine bucket wall is disclosed down in time carefully, so that all raw materials can fully mix, improve raw material availability.
Observe situation in circular cone mixing and blending machine, emerge without steam without agglomerating, dry as magnesium powder, can carry out next step, otherwise should extend mixing time.Conventionally, the time overall length of mix and blend is 20-30 minute.
103. continue to spray into and stir after 20-30 minute, in described circular cone mixing and blending machine, are sprinkled into siccative lime powder, mix while being sprinkled into.
Siccative lime powder, its granularity is 20 orders, its consumption is the 1-3% of metal magnesium powder raw material total amount.
Volume particle size lime powder, solves the dust pollution question of process for processing, has reduced cost.
Use lime powder as siccative, the common thing that lime powder is steelworks on the one hand, be easy to get, and cost is low, and meanwhile, drying effect is good.
104. continue to stir 3-5 minute.
In whipping process, observe material degree of mixedness in circular cone mixing and blending machine, as solid colour, mix well, can carry out next step, otherwise extend mixing time.
105. start discharging reciprocating sieve, open the discharge gate of circular cone mixing and blending machine, by extremely cooling charging tray of the passivation particle magnesium discharging of making.
In operation room dry, clean, that ventilate, place finished product charging tray.Start discharging reciprocating sieve.Open the discharge gate of circular cone mixing and blending machine, the dispensing speed of controlling well makes deactivating magnesium powder pass through screen cloth, and the magnesium powder under screen cloth is finished product, packs the cooling charging tray of finished product into.
Other container splendid attire for spacer on screen cloth, then pulverizes, and treats, in next production batch, to add passivator pump before siccative lime powder adds.
106. shakeout, naturally cool to below 40 ℃.
Lower charging tray sieve deactivating magnesium powder is shakeout, make its naturally cooling.For accelerating speed of cooling, can stir.
Until finished product is cooling while reaching lower than 40 ℃, can also add again water-resisting agent ethyl containing hydrogen silicone oil and passivation particle magnesium to mix, make passivation particle magnesium surface form waterproofing membrane, passivation particle magnesium now is more easily deposited.
Afterwards by its Packing Unit and fashionable dress bag in accordance with regulations, and properly sealing.
The good related item of mark in accordance with regulations in packing bag, puts finished product statistics make a record in storage.
According to a kind of smelting iron and steel passivation particle magnesium provided by the invention, preparation method is simple, with low cost.
Especially, use the relatively large 20-80 object metal magnesium powder of particle diameter that the loss of MAGNESIUM METAL in the course of processing reduced, dust floating in air is also less, is conducive to the healthy of operating personnel.
First spray into magnesium chloride passivator, make to form passive film on the surface of metal magnesium powder particle.
After 20-30 minute, all metal magnesium powder particle surfaces have substantially completed passivation, and substantially evenly passivation completely, now in circular cone mixing and blending machine, be sprinkled into siccative lime powder, Bian Sabian mixes, lime powder not only can be by unnecessary moisture absorption, can react with the water of the metal magnesium powder particle surface of passivation simultaneously, generate intermediate product calcium hydroxide, because this reaction is thermopositive reaction, waste heat makes the intermediate product formation shell generating brace the surface at metal magnesium powder particle, what now between passive film and metal magnesium powder particle, stick is more fastening, difficult drop-off.
Meanwhile, the lime powder that is attached to metal magnesium powder top layer has fire-retardant effect, can protect the metal magnesium powder in it can not burnt fast or be oxidized, and has improved the service efficiency of passivated magnesium particle.And the lime powder common tailing that is steelworks, be easy to get, and cheap, reduce the production cost of passivation particle magnesium.
By after complete siccative lime powder been sprayed, continue to stir 3-5 minute, make siccative as much as possible and the metal magnesium powder particle that has been passivated fully mixes.
After siccative been sprayed, start discharging reciprocating sieve, open circular cone mixing and blending machine discharge gate, by passivation particle magnesium discharging, the dispensing speed of controlling well makes deactivating magnesium powder pass through screen cloth, and the magnesium powder under sieve is finished product, pack the cooling charging tray of finished product into, shakeout, naturally cool to below 40 ℃.By its Packing Unit and fashionable dress bag in accordance with regulations, and properly sealing.
Precaution:
1, metal magnesium powder and siccative granularity must strictly be controlled on request.
2, production scene, facility must guarantee to be dried, cleaning.Produce, store, transport in whole process and will pay special attention to protection against the tide.As without Special Circumstances, rainy weather must not be arranged production, be transported.
3, finished product packing and having bad luck, is careful, and prevents from damaging moistureproof theca interna.
4, strict control is greater than 1mm particulate inclusions and enters finished product.
5, production scene will maintain the circulation of air, and in production whole process, absolutely no smoking.
6, equipment electrical system should be done technological processing for explosion protection feature.
7, use iron Work tool, handle with care, avoid knocking, collide generation spark.
8, must shut down when adding metal magnesium powder in machine and carry out, when adding passivator, siccative and disclosing material, will note the person and device security.
9, in production operation, to be strictly on guard against high temperature scald.
The passivation particle magnesium of making by the preparation method of passivation particle magnesium by smelting iron and steel provided by the invention, it not only can reduce the loss to feed metal magnesium in steelmaking process, can also control the duration of fire resistance after passivation particle magnesium drops in steel melting furnace, lime powder has wherein played critical effect, and because lime powder is wrapped in the outside surface of passivation particle magnesium, make the passivation particle magnesium of producing according to preparation method provided by the invention be more prone to preservation, specially sealing preservation.
And its production cost also obtained effective reduction, produce the cost cost $20000 unit of the passivation particle magnesium of 1 ton according to existing technology, still, produce the cost cost $16500-17000 unit of 1 ton of passivation particle magnesium according to method provided by the invention.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a preparation method for passivation particle magnesium for smelting iron and steel, is characterized in that, comprises the following steps:
Be that 20-80 object metal magnesium powder packs in circular cone mixing and blending machine by granularity;
Start passivator pump, in described circular cone mixing and blending machine, spray into magnesium chloride passivator, stir while spraying into;
Continue to spray into and stir after 20-30 minute, in described circular cone mixing and blending machine, being sprinkled into siccative lime powder, mixing while being sprinkled into;
Continue to stir 3-5 minute;
Start discharging reciprocating sieve, open the discharge gate of circular cone mixing and blending machine, by extremely cooling charging tray of the passivation particle magnesium discharging of making;
Shakeout, naturally cool to below 40 ℃.
2. the preparation method of passivation particle magnesium for a kind of smelting iron and steel according to claim 1, is characterized in that,
Described metal magnesium powder is that the purity of magnesium is greater than or equal to 90%, and surface drying oxide-free, and no-sundries is sneaked into.
3. the preparation method of passivation particle magnesium for a kind of smelting iron and steel according to claim 1, is characterized in that,
The magnesium chloride that described magnesium chloride passivator is is 85% by purity adds tap water, the saturated solution of making at normal temperatures.
4. the preparation method of passivation particle magnesium for a kind of smelting iron and steel according to claim 1, is characterized in that,
Described siccative lime powder, its granularity is 200 orders, its consumption is the 1-3% of metal magnesium powder raw material total amount.
5. the preparation method of passivation particle magnesium for a kind of smelting iron and steel according to claim 1, is characterized in that,
Also comprise water-resisting agent, described water-resisting agent is ethyl containing hydrogen silicone oil, and its consumption is 1% of metal magnesium powder material quantity.
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| CN201410041151.1A CN103911484B (en) | 2014-01-27 | 2014-01-27 | The preparation method of passivation particle magnesium for a kind of smelting iron and steel |
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| CN201410041151.1A CN103911484B (en) | 2014-01-27 | 2014-01-27 | The preparation method of passivation particle magnesium for a kind of smelting iron and steel |
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| CN103911484B CN103911484B (en) | 2016-05-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444853A (en) * | 2021-06-25 | 2021-09-28 | 中钢设备有限公司 | Fine-particle Mg-CaO composite desulfurizer, preparation method thereof and molten iron pre-desulfurization method |
| CN114277209A (en) * | 2021-12-27 | 2022-04-05 | 江苏正达炉料有限公司 | Preparation method of passivated granular magnesium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU384423A1 (en) * | 1971-06-14 | 1978-03-30 | Институт Титана | Method of producing granulated magnesium and magnesium-base alloys |
| US5336293A (en) * | 1992-08-13 | 1994-08-09 | Alfred Freissmuth | Desulfurizing agent for pig iron and cast iron, and process for desulfurization |
| CN2378399Y (en) * | 1999-06-07 | 2000-05-17 | 郑州中兴镁业有限公司 | Inactivate granular magnesium |
| CN101979673A (en) * | 2010-11-27 | 2011-02-23 | 营口东邦冶金设备耐材有限公司 | Preparation method of magnesium-based desulfurizing agent |
| CN102888493A (en) * | 2011-07-18 | 2013-01-23 | 江苏正达炉料有限公司 | Preparation method of passivation magnesium |
-
2014
- 2014-01-27 CN CN201410041151.1A patent/CN103911484B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU384423A1 (en) * | 1971-06-14 | 1978-03-30 | Институт Титана | Method of producing granulated magnesium and magnesium-base alloys |
| US5336293A (en) * | 1992-08-13 | 1994-08-09 | Alfred Freissmuth | Desulfurizing agent for pig iron and cast iron, and process for desulfurization |
| CN2378399Y (en) * | 1999-06-07 | 2000-05-17 | 郑州中兴镁业有限公司 | Inactivate granular magnesium |
| CN101979673A (en) * | 2010-11-27 | 2011-02-23 | 营口东邦冶金设备耐材有限公司 | Preparation method of magnesium-based desulfurizing agent |
| CN102888493A (en) * | 2011-07-18 | 2013-01-23 | 江苏正达炉料有限公司 | Preparation method of passivation magnesium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444853A (en) * | 2021-06-25 | 2021-09-28 | 中钢设备有限公司 | Fine-particle Mg-CaO composite desulfurizer, preparation method thereof and molten iron pre-desulfurization method |
| CN114277209A (en) * | 2021-12-27 | 2022-04-05 | 江苏正达炉料有限公司 | Preparation method of passivated granular magnesium |
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