CN112774862A - Mineral processing technology and device for chemical-grade chromium fine powder - Google Patents
Mineral processing technology and device for chemical-grade chromium fine powder Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
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Abstract
The invention provides a beneficiation process for chemical-grade chromium fine powder, which comprises the following steps: screening the chromium concentrate to obtain different particle size ranges; entering corresponding weak magnetic fields according to different particle size ranges, absorbing strong magnetic impurities by using weak magnetic, and separating to obtain weak magnetic chromium concentrate with different particle size ranges; and the obtained weak magnetic chromium concentrate with different granularity ranges enters a corresponding strong magnetic field, and weak magnetic impurities are absorbed and separated by strong magnetism to obtain the chemical-grade chromium concentrate powder. The beneficiation process of the invention separates the impurities of the chromium concentrate with different granularity ranges by using different magnetic field strengths to obtain the chemical-grade chromium concentrate powder, thereby solving the problem of industrial production of the domestic chemical-grade chromium concentrate.
Description
Technical Field
The invention relates to the technical field of chemical-grade chromium fine powder, in particular to a mineral separation process and device for the chemical-grade chromium fine powder.
Background
As an important strategic resource, chromium ore is widely applied to the metallurgical industry, refractory materials and chemical industry, and the chromium reserves of China are less than 2 percent in the world. The global chromium ore resources are rich, the total storage amount exceeds 120 hundred million tons, but the distribution is extremely uneven. The chromium ore resources are mainly distributed in south Africa, Zimbabwe, Hassakestan, Finland and Turkey. The U.S. geological survey data showed that the worldwide chrome reserves were about 5.6 hundred million tons in 2018, with south africa accounting for 36%, kazakhstan accounting for 41%, india accounting for 18%, and other countries around the world accounting for only 5%. From the yield, the south African chrome ore yield in 2018 accounts for 44%, the Kazakhstan accounts for 13%, the India accounts for 10%, and other countries account for 33%.
The domestic chromium ore resources in China are influenced by reserves or mining cost, and the supply is difficult to meet domestic requirements, so that imported chromium ore becomes a main source for meeting domestic production requirements. In 2017, the import of the chromium ore and the concentrate thereof in China reaches 1384.05 ten thousand tons, which is 127.32 percent higher than that in 2007. China has become the largest world import country of chromium ore. The import of Chinese chromium ore is increased to 1425.51 ten thousand tons in 2018. From the import country, the chrome ores in China are mainly imported from south Africa, Turkey and Zimbabwe, the import of the chrome ores in China in 2018 accounts for 1043.66 ten thousand tons of the largest import of the chrome ores in south Africa, 98.22 ten thousand tons of the chrome ores in the main stream Turkey, 46.91 ten thousand tons of Aman chrome ores and 22.99 ten thousand tons of the chrome ores in Bakistan, wherein the chemical-grade chrome fine powder is mainly imported from south Africa, and the import amount is 40-50 ten thousand tons per year.
The chemical grade chromium fine powder is a main raw material for producing chromium salt, but the domestic chromium ore resources are few, no enterprise for large-scale production of the chemical grade chromium fine powder exists at present, and chromium salt production enterprises depend on import of the chemical grade chromium fine powder and are limited by the supply of the chemical grade chromium fine powder in south Africa for a long time. How to break the supply limit of the chemical grade chromium fine powder is a problem which needs to be solved at present.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a beneficiation process for chemical-grade chromium concentrate powder, which separates impurities of chromium concentrate with different particle size ranges by using different magnetic field strengths to obtain chemical-grade chromium concentrate powder and solves the technical problem of industrial production of domestic chemical-grade chromium concentrate.
The second purpose of the invention is to provide a device adopting the ore dressing process, which has low cost and convenient operation.
In order to solve the technical problems, the invention provides a beneficiation process for chemical-grade chromium fine powder, which comprises the following steps:
(1) screening the chromium concentrate to obtain different particle size ranges;
(2) entering corresponding weak magnetic fields according to different particle size ranges, absorbing strong magnetic impurities by using weak magnetic, and separating to obtain weak magnetic chromium concentrate with different particle size ranges;
(3) and (3) feeding the weakly magnetic chromium concentrate with different particle size ranges obtained in the step (2) into a corresponding strong magnetic field, and absorbing and separating weakly magnetic impurities by using strong magnetism to obtain the chemical-grade chromium fine powder. Further, the different particle size ranges in step (1) include: the granularity is more than 0.425mm, the granularity is more than or equal to 0.2mm and less than or equal to 0.425mm, the granularity is more than or equal to 0.125mm and less than 0.2mm, and the granularity is less than 0.125 mm.
Further, the weak magnetic field intensities corresponding to the different particle size ranges in the step (2) are respectively as follows: the weak magnetic strength corresponding to the granularity of more than 0.425mm is 4000-4200 gausses; the corresponding weak magnetic strength is 3800-4000 gauss, the granularity is more than or equal to 0.2mm and less than or equal to 0.425 mm; the weak magnetic strength corresponding to the granularity of more than or equal to 0.125mm and less than 0.2mm is 3500-3800 gauss; the weak magnetic strength corresponding to the granularity of less than 0.125mm is 3000-3500 gauss.
Further, the strong magnetic field intensities respectively corresponding to the weak magnetic chromium concentrates with different particle size ranges in the step (3) are respectively as follows: the corresponding strong magnetic strength with the granularity of more than 0.425mm is 8800-9000 Gauss; the corresponding strong magnetic strength is 8800 gauss with the granularity of more than or equal to 0.2mm and less than or equal to 0.425 mm; the corresponding strong magnetic strength is 8200-8500 gauss with the granularity of more than or equal to 0.125mm and less than 0.2 mm; the strong magnetic strength corresponding to the granularity of less than 0.125mm is 8000-8200 gauss.
Furthermore, the impurity content of the chemical-grade chromium fine powder is less than 1%.
In addition, the invention also provides a device adopting the ore dressing process, which comprises a screening mechanism, a weak magnetic separator and a strong magnetic separator which are connected in sequence.
Furthermore, the screening mechanism comprises a square vibrating screen, and a screen mesh of the square vibrating screen is of a detachable structure.
Furthermore, the device also comprises a fluidized bed furnace, a drying system and a dust removal system which are connected in sequence, wherein the dust removal system is connected with the screening mechanism.
Further, the drying system comprises a three-pass dryer.
Further, the dust removal system comprises a bag-type dust remover.
Compared with the prior art, the invention has the beneficial effects that:
the beneficiation process of the chemical-grade chromium concentrate powder separates impurities of chromium concentrate with different granularity ranges by using different magnetic field strengths to obtain the chemical-grade chromium concentrate powder, and solves the problem of industrial production of the chemical-grade chromium concentrate in China.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a beneficiation plant according to the present invention.
Description of reference numerals:
1-fluidized bed furnace; 2-three-pass dryer;
3-bag dust collector; 4-square vibrating screen;
5-weak magnetic separator; 6-strong magnetic separator.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
By adopting the beneficiation device shown in fig. 1, firstly, chromium concentrate is sent into a three-pass dryer 2 for drying, wherein a fluidized bed furnace 1 provides a heat source for the three-pass dryer 2, the dried chromium concentrate enters a bag-type dust collector 3 for dust removal, and then a square vibrating screen 4 is used for screening different particle size ranges, which are specifically divided into: chromium concentrate with granularity more than 0.425mm, granularity more than or equal to 0.2mm and less than or equal to 0.425mm, granularity more than or equal to 0.125mm and granularity less than 0.2mm and granularity less than 0.125 mm.
Respectively feeding the 4 kinds of chromium concentrates with different particle size ranges into a weak magnetic separator 5, and correspondingly adjusting different magnetic field strengths of the weak magnetic separator 5 according to different particle sizes, wherein the weak magnetic strength of the weak magnetic separator 5 is correspondingly adjusted to 4000 gauss when the particle size is larger than 0.425 mm; the particle size is more than or equal to 0.2mm and less than or equal to 0.425mm, and the weak magnetic strength of the weak magnetic separator 5 is correspondingly adjusted to 3800 gauss; correspondingly adjusting the weak magnetic strength of the weak magnetic separator 5 to 3500 gauss with the granularity of more than or equal to 0.125mm and less than 0.2 mm; correspondingly adjusting the weak magnetic strength of the weak magnetic separator 5 to 3000 gauss when the granularity is less than 0.125mm, absorbing the strong magnetic impurities in the chromium concentrate by using different weak magnetic strengths, and separating the impurities to obtain the 4 kinds of weak magnetic chromium concentrates with different granularity ranges.
Finally, the 4 kinds of weak magnetic chromium concentrates with different particle size ranges are respectively put into a strong magnetic separator 6, different magnetic field strengths of the strong magnetic separator 6 are respectively and correspondingly adjusted according to different particle sizes, wherein the strong magnetic strength of the strong magnetic separator 6 is correspondingly adjusted to be 8800 gauss when the particle size is larger than 0.425 mm; the granularity of 0.2mm or more and 0.425mm or less, and correspondingly adjusting the strong magnetic strength of the strong magnetic separator 6 to 8500 gauss; the grain size is more than or equal to 0.125mm and less than 0.2mm, and the strong magnetic intensity of the strong magnetic separator 6 is correspondingly adjusted to 8200 gauss; correspondingly adjusting the strong magnetic intensity of the strong magnetic separator 6 to 8000 Gauss with the granularity less than 0.125mm, absorbing the weak magnetic impurities in the weak magnetic chromium concentrate by using different strong magnetic intensities, and separating the impurities to obtain the chemical-grade chromium concentrate powder.
Example 2
By adopting the beneficiation device shown in fig. 1, firstly, chromium concentrate is sent into a three-pass dryer 2 for drying, wherein a fluidized bed furnace 1 provides a heat source for the three-pass dryer 2, the dried chromium concentrate enters a bag-type dust collector 3 for dust removal, and then a square vibrating screen 4 is used for screening different particle size ranges, which are specifically divided into: chromium concentrate with granularity more than 0.425mm, granularity more than or equal to 0.2mm and less than or equal to 0.425mm, granularity more than or equal to 0.125mm and granularity less than 0.2mm and granularity less than 0.125 mm.
Respectively feeding the 4 kinds of chromium concentrates with different particle size ranges into a weak magnetic separator 5, and correspondingly adjusting different magnetic field strengths of the weak magnetic separator 5 according to different particle sizes, wherein the weak magnetic strength of the weak magnetic separator 5 is correspondingly adjusted to be 4200 gauss when the particle size is larger than 0.425 mm; the particle size is more than or equal to 0.2mm and less than or equal to 0.425mm, and the weak magnetic strength of the weak magnetic separator 5 is correspondingly adjusted to 4000 gausses; correspondingly adjusting the weak magnetic strength of the weak magnetic separator 5 to 3800 gauss when the granularity is more than or equal to 0.125mm and less than 0.2 mm; correspondingly adjusting the weak magnetic strength of the weak magnetic separator 5 to 3500 gauss with the granularity less than 0.125mm, absorbing the strong magnetic impurities in the chromium concentrate by utilizing different weak magnetic strengths, and separating the impurities to obtain the 4 kinds of weak magnetic chromium concentrates with different granularity ranges.
Finally, the 4 kinds of weak magnetic chromium concentrates with different particle size ranges are respectively put into a strong magnetic separator 6, and different magnetic field strengths of the strong magnetic separator 6 are respectively and correspondingly adjusted according to different particle sizes, wherein the strong magnetic strength of the strong magnetic separator 6 is correspondingly adjusted to 9000 gauss when the particle size is larger than 0.425 mm; the grain size is more than or equal to 0.2mm and less than or equal to 0.425mm, and the strong magnetic intensity of the strong magnetic separator 6 is correspondingly adjusted to 8800 gauss; the particle size of 0.125mm or less is less than 0.2mm, and the strong magnetic intensity of the strong magnetic separator 6 is correspondingly adjusted to 8500 gauss; correspondingly adjusting the strong magnetic strength of the strong magnetic separator 6 to 8200 gauss with the granularity less than 0.125mm, sucking the weak magnetic impurities in the weak magnetic chromium concentrate by utilizing different strong magnetic strengths, and separating the impurities to obtain the chemical grade chromium fine powder.
Example 3
By adopting the beneficiation device shown in fig. 1, firstly, chromium concentrate is sent into a three-pass dryer 2 for drying, wherein a fluidized bed furnace 1 provides a heat source for the three-pass dryer 2, the dried chromium concentrate enters a bag-type dust collector 3 for dust removal, and then a square vibrating screen 4 is used for screening different particle size ranges, which are specifically divided into: chromium concentrate with granularity more than 0.425mm, granularity more than or equal to 0.2mm and less than or equal to 0.425mm, granularity more than or equal to 0.125mm and granularity less than 0.2mm and granularity less than 0.125 mm.
Respectively feeding the 4 kinds of chromium concentrates with different particle size ranges into a weak magnetic separator 5, and correspondingly adjusting different magnetic field strengths of the weak magnetic separator 5 according to different particle sizes, wherein the weak magnetic strength of the weak magnetic separator 5 is correspondingly adjusted to 4100 gauss when the particle size is larger than 0.425 mm; the particle size is more than or equal to 0.2mm and less than or equal to 0.425mm, and the weak magnetic strength of the weak magnetic separator 5 is correspondingly adjusted to 3900 gauss; correspondingly adjusting the weak magnetic strength of the weak magnetic separator 5 to 3650 gauss when the granularity is more than or equal to 0.125mm and less than 0.2 mm; correspondingly adjusting the weak magnetic strength of the weak magnetic separator 5 to 3250 gauss when the granularity is less than 0.125mm, absorbing the strong magnetic impurities in the chromium concentrate by using different weak magnetic strengths, and separating the impurities to obtain the 4 kinds of weak magnetic chromium concentrates with different granularity ranges.
Finally, the 4 kinds of weak magnetic chromium concentrates with different particle size ranges are respectively put into a strong magnetic separator 6, different magnetic field strengths of the strong magnetic separator 6 are respectively and correspondingly adjusted according to different particle sizes, wherein the strong magnetic strength of the strong magnetic separator 6 is correspondingly adjusted to 8900 gauss when the particle size is larger than 0.425 mm; the granularity of 0.2mm or more and 0.425mm or less, correspondingly adjusting the strong magnetic intensity of the strong magnetic separator 6 to 8650 gauss; the grain size is more than or equal to 0.125mm and less than 0.2mm, and the strong magnetic intensity of the strong magnetic separator 6 is correspondingly adjusted to 8350 gauss; correspondingly adjusting the strong magnetic intensity of the strong magnetic separator 6 to 8100 gauss when the granularity is less than 0.125mm, sucking the weak magnetic impurities in the weak magnetic chromium concentrate by utilizing different strong magnetic intensities, and separating the impurities to obtain the chemical grade chromium concentrate powder.
By analyzing the impurities of the chemical grade chromium fine powder obtained in the above examples 1 to 3, the impurity content is less than 1%. In a word, the beneficiation process of the chemical-grade chromium concentrate powder separates the impurities of the chromium concentrate with different granularity ranges by using different magnetic field strengths to obtain the chemical-grade chromium concentrate powder, and solves the problem of industrial production of the chemical-grade chromium concentrate in China.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A mineral processing technology of chemical-grade chromium fine powder is characterized by comprising the following steps:
(1) screening the chromium concentrate to obtain different particle size ranges;
(2) entering corresponding weak magnetic fields according to different particle size ranges, absorbing strong magnetic impurities by using weak magnetic, and separating to obtain weak magnetic chromium concentrate with different particle size ranges;
(3) and (3) feeding the weakly magnetic chromium concentrate with different particle size ranges obtained in the step (2) into a corresponding strong magnetic field, and absorbing and separating weakly magnetic impurities by using strong magnetism to obtain the chemical-grade chromium fine powder.
2. The beneficiation process according to claim 1, wherein the different particle size ranges in step (1) comprise: the granularity is more than 0.425mm, the granularity is more than or equal to 0.2mm and less than or equal to 0.425mm, the granularity is more than or equal to 0.125mm and less than 0.2mm, and the granularity is less than 0.125 mm.
3. The beneficiation process according to claim 2, wherein the different particle size ranges in the step (2) respectively correspond to weak magnetic field strengths of: the weak magnetic strength corresponding to the granularity of more than 0.425mm is 4000-4200 gausses; the corresponding weak magnetic strength is 3800-4000 gauss, the granularity is more than or equal to 0.2mm and less than or equal to 0.425 mm; the weak magnetic strength corresponding to the granularity of more than or equal to 0.125mm and less than 0.2mm is 3500-3800 gauss; the weak magnetic strength corresponding to the granularity of less than 0.125mm is 3000-3500 gauss.
4. The beneficiation process according to claim 2, wherein the weak magnetic chromium concentrates in the different particle size ranges in the step (3) respectively correspond to strong magnetic field strengths of: the corresponding strong magnetic strength with the granularity of more than 0.425mm is 8800-9000 Gauss; the corresponding strong magnetic strength is 8800 gauss with the granularity of more than or equal to 0.2mm and less than or equal to 0.425 mm; the corresponding strong magnetic strength is 8200-8500 gauss with the granularity of more than or equal to 0.125mm and less than 0.2 mm; the strong magnetic strength corresponding to the granularity of less than 0.125mm is 8000-8200 gauss.
5. The beneficiation process according to claim 1, wherein the chemical grade chromium concentrate has an impurity content of < 1%.
6. An apparatus using the beneficiation process according to any one of claims 1 to 5, characterized by comprising a screening mechanism, a weak magnetic separator and a strong magnetic separator connected in sequence.
7. The apparatus of claim 6, wherein the screening mechanism comprises a square vibrating screen, and the screen mesh of the square vibrating screen is of a detachable structure.
8. The apparatus of claim 6, further comprising a fluidized bed furnace, a drying system and a dust removal system connected in series, wherein the dust removal system is connected to the screening mechanism.
9. The apparatus of claim 8, wherein the drying system comprises a triple-pass dryer.
10. The apparatus of claim 8, wherein the dust removal system comprises a bag-type dust remover.
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