CN103693978B - Preparation method of casting level chromium ore - Google Patents
Preparation method of casting level chromium ore Download PDFInfo
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- CN103693978B CN103693978B CN201310682379.4A CN201310682379A CN103693978B CN 103693978 B CN103693978 B CN 103693978B CN 201310682379 A CN201310682379 A CN 201310682379A CN 103693978 B CN103693978 B CN 103693978B
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Abstract
The invention discloses a preparation method of casting level chromium ore. The preparation method comprises the steps of: drying a chromium ore raw material containing 40.0-45.0 percent of Cr2O3 and 1.5-4.0 percent of SiO2 and having a granularity of 10-100 meshes and a concentration ratio of more than 50 percent in a dryer for 5-60min, and discharging chromium ore particles after the drying is completed; screening the dried chromium ore particles to respectively obtain chromium ore particles with granularities of 10-30 meshes, 10-40 meshes, 10-50 meshes, 10-60 meshes, 20-70 meshes, 40-70 meshes or 50-100 meshes and a concentration ratio of more than 70 percent; performing magnetic separation by setting the intensity of a magnetic field to be 6000-14000 gausses to obtain the casting level chromium ore and bagging and sealing. According to the preparation method, the chromium ore raw materials can be classified and treated according to different properties, the materials are saved, the cost is lowered, and the granularity is conveniently controlled.
Description
Technical field
The present invention relates to sorting mineral technology, particularly relate to a kind of preparation method of casting level chrome ore.
Background technology
Chrome ore, also known as chromite sand, is casting special sand, is the natural spinelle based on chromite, through crushing,
It is sieved into designated size it is adaptable to moulding（Coremaking）Sand.Chrome ore is according to chemical composition divided into 2 grades；One-level Cr2O3≥45%；Two
Level Cr2O3≥35%.Chrome ore is mainly used in the facing sand of large-scale steel-casting in Foundry Production, prevents scab；Secondly
Its pulverizing is used for the refractory aggregate of cast paint；Can be also used for refractory material, produce chromium matter stuffing sand, magnesite-chrome brick, magnesium chromium
Sand.
Casting chrome ore is the product of the natural chromite technique processing such as after crushing and screening, and its main chemical compositions is
Cr2O3.Be heated volume stability, thermal conductivity of this sand is high, not only has the work of good alkali resistance slag with motlten metal when contacting
With not with chemically reactives such as ferrum oxides, and there is solid-phase sintering in itself, oozing of motlten metal being prevented well
Thoroughly, it is to avoid produce scab defect it is adaptable to various rustless steel, the steel alloy and carbon steel gradually roughing sand of molding and core making and coating.
But currently without preferable sorting processing method, and the casting level chrome ore price of import is high and refractory temperature is not managed
Think.
Content of the invention
It is an object of the invention to solving the deficiency in above technology, proposing a kind of environmental protection, high temperature resistant, high intensity, being heated
The preparation method of the casting level chrome ore of volume stability.
The technical scheme is that and be achieved in that：
The preparation method of casting level chrome ore, comprises the following steps：
Step（1）Dry：By granularity, for 10-100 mesh and concentration ratio, the chrome ore raw material more than 50% is put in dehydrator
Dried, drying time period is 5-60 minute, after the completion of drying, chrome ore granule is discharged；
Step（2）Screening：By step（1）Chrome ore granule sieved by vibrosieve, acquisition granularity be 10-30
Mesh, 10-40 mesh, 10-50 mesh, 10-60 mesh, 20-70 mesh, 40-70 mesh or 50-100 mesh and the chrome ore sandy plain more than 70% for the concentration ratio
Material；
Step（3）High intensity magnetic separation takes：By step（2）Chrome ore granule place magnetic separator in, magnetic field intensity is set to
6000-14000 Gauss, obtains casting level chrome ore；
Step（4）Encapsulation：By step（3）Chrome ore granule encapsulation.
Preferably, in step（1）Also include sieving for the first time before：Chrome ore raw material is sent to vibrosieve, adds water, enter
Row screening, obtains the chrome ore granule that granularity is more than 100 mesh.
Preferably, also included reuse adoption process before first screening, chrome ore raw material is placed in feed bin, is set by gravity treatment
Standby removal mud and impurity, remove MgO, Al simultaneously2O3And SiO2.
Preferably, Cr in chrome ore raw material2O3Mass content be 40.0%-45.0%, SiO2Mass content be 1.5%-
4.0%th, other are 53.5%-56.0%.
Preferably, described gravitational separation equipment is spiral chute.
Preferably, step（1）The drying temperature of middle dehydrator is 400-1500 DEG C.
Preferably, magnetic separator is permanent magnetic separator or electromagnetic separator.
Preferably, magnetic field intensity is 8000 Gausses.
Preferably, Cr in casting level chrome ore2O3Mass content be 45.0-48.0%, SiO2Mass content 0-1.8%,
Other are 50.2%-52%.
Preferably, dehydrator is roller dryer.
It is major ingredient that the present invention adopts chrome ore, takes process acquisition by taking separating screen, drying, secondary sub-sieve, high intensity magnetic separation
Granularity is 10-100 mesh, Cr2O3Content is 45.0-48.0%, SiO2Content is the casting level chrome ore of 0-1.8%, the inventive method
Simply, low cost, efficiency high, and the casting level chrome ore thermostability producing is preferably, roughness is less, and breathability preferably, can be kept away
Avoid scab on foundry goods.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, also may be used
So that other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 casts the schematic flow sheet of the preparation method of level chrome ore for the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
The present invention relates to the preparation method of casting level chrome ore, also known as chromite, chrome ore, chrome ore is husky, chromite for chrome ore
Sand or chromite sand, being casting level chrome ore according to the product that the present invention produces, because can be used for fire resisting, being also called refractory grade
Chrome ore.
Embodiment one：
As shown in figure 1, the chrome ore raw material for unstable properties is Cr2O3Mass content be 40.0%-45.0%,
SiO2Mass content be 1.5%-4.0%, other are 53.5%-56.0%, and color and luster is coarse, is mixed with yellow or brown particle, granule
Spend uneven chrome ore raw material, the preparation method of the casting level chrome ore of the present invention is as follows：
1st, gravity treatment：Chrome ore raw material is placed in feed bin, mud and impurity is removed by gravitational separation equipment, remove simultaneously MgO,
Al2O3And SiO2, gravitational separation equipment is spiral chute, by the mud in reuse adoption process removal chrome ore raw material and impurity etc., passes through
Mine tailing after re-selection process is positioned in tailing heap, and midseam is carried out individual processing, such as raw material is carried out secondary gravity treatment, or
Raw material as metallurgical grade is sold or other process, concentrate is selected, is for further processing；
2nd, first screening：Concentrate after gravity treatment is sent to vibrosieve, adds water, sieved, obtain granularity
Chrome ore granule more than 100 mesh；Add water can accelerate screening effect, mud and impurity are washed off, the chrome ore less than 100 mesh
Sand granule and impurity screen out.
3rd, dry：Chrome ore raw material after first screening is put in roller dryer and is dried, drying time period is
5-60 minute, a length of 30 minutes when optimum, drying temperature is 400-1500 DEG C, and Optimal Temperature is 1000 DEG C, will after the completion of drying
Chrome ore granule is discharged；Dry in the sun it can also be made to be dried, shortcoming is that batch is too little；
4th, regrading：The chrome ore granule of drying is carried out second screening by vibrosieve, acquisition granularity is 10-
30 mesh, 10-40 mesh, 10-50 mesh, 10-60 mesh, 20-70 mesh, 40-70 mesh or 50-100 mesh and the chrome ore more than 70% for the concentration ratio
Raw material；
5th, high intensity magnetic separation takes：Chrome ore granule after regrading is placed in magnetic separator, magnetic field intensity is set to 6000-
14000 Gausses, obtain casting level chrome ore.Preferably, magnetic separator is permanent magnetic separator or electromagnetic separator；Magnetic field intensity is
8000 Gausses.
6th, encapsulate：The encapsulation of level chrome ore granule will be cast, specification is 25kg/ bag or jumbo bag packaging.
Embodiment two：
It is Cr for performance metastable chrome ore raw material2O3Mass content be 40.0%-45.0%, SiO2Quality
Content is 1.5%-4.0%, and other are the chrome ore raw material of 53.5%-56.0% and uniform color, the casting level chrome ore of the present invention
Preparation method as follows：
1st, first screening：Chrome ore sand plain material is put into feed bin, is sent to vibrosieve, add water, sieved, obtain granule
Degree is more than the chrome ore granule of 100 mesh；
2nd, dry：Chrome ore raw material after first screening is put in dehydrator and is dried, drying time period is divided for 5-60
Clock, drying temperature is 400-1500 DEG C, after the completion of drying discharges chrome ore granule；Dry in the sun it can also be made to be dried, shortcoming is
Batch is too little；
3rd, regrading：The chrome ore granule of drying is carried out second screening by vibrosieve, acquisition granularity is 10-
30 mesh, 10-40 mesh, 10-50 mesh, 10-60 mesh, 20-70 mesh, 40-70 mesh or 50-100 mesh and the chrome ore more than 70% for the concentration ratio
Raw material；
4th, high intensity magnetic separation takes：Chrome ore granule after regrading is placed in magnetic separator, magnetic field intensity is set to 6000-
14000 Gausses, obtain casting level chrome ore.Preferably, magnetic separator is permanent magnetic separator or electromagnetic separator；Magnetic field intensity is
8000 Gausses.
5th, encapsulate：The encapsulation of level chrome ore granule will be cast, specification is 25kg/ bag or jumbo bag packaging.
Embodiment three：
It is Cr for the particularly stable chrome ore raw material of performance2O3Mass content be 40.0%-45.0%, SiO2Quality
Content is 1.5%-4.0%, and other are 53.5%-56.0% and uniform color, granularity is 10-100 mesh and concentration ratio is more than 50% mesh
Chrome ore raw material, the preparation method of the casting level chrome ore of the present invention is as follows：
1st, dry：Chrome ore raw material is put in roller dryer and is dried, drying time period is 5-60 minute, dries
Temperature is 400-1500 DEG C, after the completion of drying discharges chrome ore granule；Dry in the sun it can also be made to be dried, shortcoming is in batches too
Little；
2nd, sieve：The chrome ore granule of drying is sieved by vibrosieve, obtaining granularity is 10-30 mesh, 10-40
Mesh, 10-50 mesh, 10-60 mesh, 20-70 mesh, 40-70 mesh or 50-100 mesh and the chrome ore granule more than 70% for the concentration ratio；
3rd, high intensity magnetic separation takes：Chrome ore granule after screening is placed in magnetic separator, magnetic field intensity is set to 6000-
14000 Gausses, obtain casting level chrome ore.Preferably, magnetic separator is permanent magnetic separator or electromagnetic separator；Magnetic field intensity is
8000 Gausses.
4th, encapsulate：The encapsulation of level chrome ore granule will be cast, specification is 25kg/ bag or jumbo bag packaging.
The preparation method of the casting level chrome ore of the present invention, it is possible to obtain the chrome ore of three kinds of ranks, specific as follows：
| Rank | One-level | Two grades | Three-level |
| Cr2O3 | 45%-48% | 45%-48% | 44.5%-48% |
| SiO2 | 0%-1% | 0%-1.5% | 1.5%-1.8% |
| Al2O3 | 13%-16% | 13%-16% | 13%-16% |
| MgO | 9%-11% | 9%-11% | 9%-11% |
| CaO | 0%-1% | 0%-1% | 0%-1% |
| FeO | 25.5%-28% | 25.5%-28% | 25.5%-28% |
Wherein, in chrome ore, the ratio of Cr and Fe is：1.4:1-1.8:1.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (6)
1. the preparation method of casting level chrome ore is it is characterised in that comprise the following steps：
Step (1) is dried：By granularity, for 10-100 mesh and concentration ratio, the chrome ore raw material more than 50% is put in dehydrator
Row is dried, and drying time period is 5-60 minute, after the completion of drying discharges chrome ore granule；
Step (2) is sieved：The chrome ore granule of step (1) is sieved by vibrosieve, acquisition granularity be 10-30 mesh,
10-40 mesh, 10-50 mesh, 10-60 mesh, 20-70 mesh, 40-70 mesh or 50-100 mesh and the chrome ore more than 70% for the concentration ratio
Grain；
Step (3) high intensity magnetic separation takes：The chrome ore granule of step (2) is placed in magnetic separator, magnetic field intensity is set to 6000-
14000 Gausses, obtain casting level chrome ore；
Step (4) encapsulates：Chrome ore granule encapsulation by step (3)；
Also included sieving for the first time before step (1)：Chrome ore raw material is sent to vibrosieve, adds water, sieved, obtain
Granularity is more than the chrome ore raw material of 100 mesh；
Also included reuse adoption process before described first screening, chrome ore raw material is placed in feed bin, is removed by gravitational separation equipment
Mud and impurity, remove MgO, Al simultaneously2O3And SiO2；
Cr in described chrome ore raw material2O3Mass content be 40.0%-45.0%, SiO2Mass content be 1.5%-
4.0%th, other are 53.5%-56.0%, and said components mass percent sum is 100%；
Cr in described casting level chrome ore2O3Mass content be 45.0-48.0%, SiO2Mass content 0-1.8%, other
For 50.2%-52%, said components mass percent sum is 100%.
2. according to claim 1 casting level chrome ore preparation method it is characterised in that：Described gravitational separation equipment is spiral
Chute.
3. according to claim 1 casting level chrome ore preparation method it is characterised in that：Dehydrator in step (1)
Drying temperature is 400-1500 DEG C.
4. according to claim 1 casting level chrome ore preparation method it is characterised in that：Described magnetic separator is permanent-magnet magnetic
Select machine or electromagnetic separator.
5. according to claim 1 casting level chrome ore preparation method it is characterised in that：Described magnetic field intensity is 8000
Gauss.
6. according to claim 1 casting level chrome ore preparation method it is characterised in that：Described dehydrator is drum-type
Dehydrator.
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| CN201310682379.4A CN103693978B (en) | 2013-12-12 | 2013-12-12 | Preparation method of casting level chromium ore |
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| CN201310682379.4A CN103693978B (en) | 2013-12-12 | 2013-12-12 | Preparation method of casting level chromium ore |
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| CN103693978B true CN103693978B (en) | 2017-02-08 |
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| CN112774862B (en) * | 2021-02-02 | 2023-06-20 | 刘小玮 | Mineral separation process and device for chemical grade chromium refined powder |
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