CN115254275B - Method for reducing energy consumption of high-pressure roller mill-ball mill system - Google Patents
Method for reducing energy consumption of high-pressure roller mill-ball mill system Download PDFInfo
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- CN115254275B CN115254275B CN202210939349.6A CN202210939349A CN115254275B CN 115254275 B CN115254275 B CN 115254275B CN 202210939349 A CN202210939349 A CN 202210939349A CN 115254275 B CN115254275 B CN 115254275B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005265 energy consumption Methods 0.000 title claims abstract description 23
- 238000000227 grinding Methods 0.000 claims abstract description 166
- 238000012360 testing method Methods 0.000 claims abstract description 42
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000498 ball milling Methods 0.000 claims abstract description 19
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 18
- 239000011707 mineral Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 239000011148 porous material Substances 0.000 claims abstract description 17
- 238000007873 sieving Methods 0.000 claims abstract description 9
- 238000002474 experimental method Methods 0.000 claims abstract description 5
- 238000011068 loading method Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 239000000919 ceramic Substances 0.000 claims description 11
- 238000011049 filling Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 238000006068 polycondensation reaction Methods 0.000 claims description 3
- 239000000047 product Substances 0.000 description 28
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 239000011733 molybdenum Substances 0.000 description 6
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- 238000000926 separation method Methods 0.000 description 5
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
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- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
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- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 239000002241 glass-ceramic Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The application provides a method for reducing energy consumption of a high-pressure roller grinding-ball milling system, and relates to the field of ore grinding. The method comprises the following steps: determining the 95% sieving granularity of ore feeding of a mill and the closed-loop circulation sieve pore size of a Bond ball mill power index test, and carrying out experiments according to the closed-loop circulation sieve pore size of the Bond ball mill power index test to obtain a Bond ball mill power index; dividing ore feeding granularity composition of an ore mill according to a narrow granularity dividing principle to obtain the relative yield of each level except for the granularity below the corresponding granularity of the target ore grinding fineness; determining the size of the multistage non-ferrous grinding medium corresponding to each narrow-size-fraction mineral in the full ore feeding of the ore mill according to a calculation formula of the size of the non-ferrous grinding medium and the relative yield; and (3) taking the size of the multi-stage non-ferrous grinding medium as a non-ferrous medium assembly scheme of the ore grinding machine to carry out non-ferrous grinding medium loading and carrying out ore grinding. According to the method for reducing the energy consumption of the high-pressure roller grinding-ball milling system, the granularity uniformity of the ground ore product is improved, and the energy consumption of the grinding system is reduced.
Description
Technical Field
The application relates to the field of ore grinding, in particular to a method for reducing energy consumption of a high-pressure roller grinding-ball milling system.
Background
The grinding operation is used as a treatment procedure for reducing the granularity of materials by means of the impact and grinding action of grinding media and the materials, and is widely applied to various fields of cement, novel building materials, refractory materials, mines, chemical industry, glass ceramics and the like which are closely related to the survival and development of human society. Because the spherical medium is simple to manufacture, the ball mill is most widely applied in field production and is mainly applied to the mineral separation industry, the ore grinding operation is used as a necessary link of a mineral separation plant, the investment cost is about 60% of the investment cost of the mineral separation plant, the magnetic separation plant reaches more than 75%, the production operation cost is also more than 40%, the electric power consumption is 50% -60% of mineral separation, and the electric quantity used for ore grinding in China is more than 5% of the total power generation of China each year, so that the energy conservation and consumption reduction of the ore grinding operation are important for building a green mine.
The high-pressure roller mill is a novel efficient crushing device and has the characteristics of low unit crushing power consumption and steel consumption, large processing capacity, high equipment operation rate, small occupied area and the like. The high-pressure roller mill is used for crushing a product, a large number of microcracks are arranged in the product, the Bond ball milling work index can be effectively reduced, and the energy-saving effect is obvious. Many researchers have conducted extensive research on the high pressure roll milling process to reduce the Bond ball work index of the product. Yuan Zhitao and the like are used for carrying out high-pressure roller grinding and jaw crushing comparison on Panxi vanadium titano-magnetite, and the Bond ball milling work index of the high-pressure roller grinding product is 14.05% lower than that of the jaw crushing product, so that the energy-saving effect is remarkable. Yin Mozhong and the like are subjected to high-pressure roller grinding and jaw crushing tests, and the result shows that the Bond ball mill work index of the high-pressure roller grinding product is at least 9.05 percent lower than that of the jaw crushing product.
In the grinding process of bulk metal sulphide ore mills, a high-pressure roller mill is often used as fine grinding operation equipment, and a ball mill-hydrocyclone ore grinding classification system is used subsequently. However, the maximum granularity of the high-pressure roller mill product is far smaller than that of the conventional three-section one-closed circuit ore crushing process, and the surface and the inside of the particles of the product are often accompanied with microcracks due to the special lamination crushing mode of the high-pressure roller mill, if the conventional ore grinding medium system configuration method is adopted, the force of the medium acting on mineral particles is overlarge due to overlarge medium size and the effective density of the medium in ore pulp, so that the crushing is formed, the sorting is not facilitated, and meanwhile, the process does not fully exert the advantage of reducing the energy consumption of a crushing and grinding system due to the high-pressure roller mill.
How to reduce the overgrinding content and the system energy consumption of high-pressure roller grinding-ball milling products becomes the key point and the difficulty of research in the field.
Disclosure of Invention
The present application aims to provide a method for reducing the energy consumption of a high-pressure roller grinding-ball milling system, so as to solve the above problems.
In order to achieve the above purpose, the present application adopts the following technical scheme:
a method of reducing energy consumption in a high pressure roll milling-ball milling system, comprising:
determining the 95% sieving granularity of ore feeding of a mill and the size of closed-loop circulation sieve holes of a Bond ball mill power index test, and carrying out experiments according to the size of the closed-loop circulation sieve holes of the Bond ball mill power index test to obtain a Bond ball mill power index;
dividing ore feeding granularity composition of an ore mill according to a narrow granularity dividing principle to obtain the relative yield of each level except for the granularity below the corresponding granularity of the target ore grinding fineness;
determining the size of the multi-stage non-ferrous grinding medium corresponding to each narrow-size-fraction mineral in the full ore feeding of the ore grinding machine according to a calculation formula of the size of the non-ferrous grinding medium and the relative yield;
taking the size of the multi-stage non-ferrous grinding medium as a non-ferrous medium assembly scheme of a grinding machine to carry out non-ferrous grinding medium loading and adding, and carrying out grinding;
the calculation formula of the size of the nonferrous grinding medium is as follows:
wherein D is b The precise sphere diameter and cm are required for the ore feeding granularity d under the specific ore grinding condition; k (K) c Correcting the coefficient for the comprehensive experience; psi is the mill rotation rate,%; wib is Bond ball milling work index, kW.h/t; ρ e Is the effective density of non-iron grinding medium in ore pulp, g/cm 3 ；D 0 The diameter of the intermediate polycondensation layer of the nonferrous grinding medium in the grinding machine; d, d f The mill was fed with 95% sieve size, cm.
Preferably, the method for determining the closed cycle sieve pore size of the Bond ball mill work index test comprises the following steps:
dividing the target grinding fineness by 0.074 to obtain a result a, and then selecting the adjacent value of the result a in a Taylor screen sequence as the size of a closed cycle screen hole of the Bond ball mill work index test.
Preferably, the dividing includes: and (5) sequentially dividing the ore grinding fineness into 4-5 grades according to the ore feeding granularity of the ore grinding machine, wherein the granularity is lower than the granularity corresponding to the target ore grinding fineness.
Preferably, the range of the relative yield value of each grade is controlled to be 15% -30%, and the sum of the yields of the divided grades is 100.
Preferably, the particle size corresponding to the target grinding fineness is:
the particle size corresponding to 60% -70% of 0.074mm is 0.212mm, the particle size corresponding to 70% -80% of 0.074mm is 0.15mm, and the particle size corresponding to 80% -85% of 0.074mm is 0.10mm.
Preferably, when ore grinding is performed, the medium filling rate of the ore grinding machine, the ore grinding concentration and the overflow fineness in classification are controlled.
Preferably, the medium filling rate of the ore grinding machine is kept between 36 and 48 percent, the ore grinding concentration is kept between 75 and 86 percent, and the overflow fineness in the classification is between 60 and 85 percent.
Preferably, the ore feeding of the ore mill is a closed-circuit screened product of a high-pressure roller mill.
Preferably, the mill feed has a 95% screened particle size of 2.36mm to 6.7mm.
Preferably, the nonferrous grinding media include, but are not limited to, grinding media of nonferrous materials such as alumina ceramic balls, zirconia ceramic balls, and the like.
Compared with the prior art, the beneficial effects of this application include:
according to the method for reducing the energy consumption of the high-pressure roller mill-ball mill system, the Bond ball mill power index is obtained through determining the size of closed-loop circulation sieve holes in the Bond ball mill power index test, and further through the experiment; dividing ore feeding granularity composition of an ore mill according to a narrow granularity dividing principle to obtain the relative yield of each level except for the granularity below the corresponding granularity of the target ore grinding fineness; then determining the size of the multi-stage non-ferrous grinding medium corresponding to each narrow-size-fraction mineral in the full ore feeding of the ore grinding machine according to a calculation formula of the size of the non-ferrous grinding medium and the relative yield; therefore, the maximum size of the nonferrous grinding medium is determined based on the ore granularity and the rock-ore characteristics under the high-pressure roller grinding-ball grinding process conditions, a feasible method is provided for determining the size of the nonferrous grinding medium of the ball mill, the content of the excessively fine particle fraction of-5 mu m is reduced, the content of the easily selectable particle fraction of the middle is improved by-0.10+0.020mm, the granularity uniformity of the grinding product is improved, and the energy consumption of a grinding system is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be considered as limiting the scope of the present application.
Fig. 1 is a flow chart of the non-ferrous medium system assembly of the high-pressure roller mill-ball mill system provided in the embodiment of the application.
Detailed Description
The term as used herein:
"prepared from … …" is synonymous with "comprising". The terms "comprising," "including," "having," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.
The conjunction "consisting of … …" excludes any unspecified element, step or component. If used in a claim, such phrase will cause the claim to be closed, such that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of … …" appears in a clause of the claim body, rather than immediately following the subject, it is limited to only the elements described in that clause; other elements are not excluded from the stated claims as a whole.
When an equivalent, concentration, or other value or parameter is expressed as a range, preferred range, or a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when ranges of "1 to 5" are disclosed, the described ranges should be construed to include ranges of "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a numerical range is described herein, unless otherwise indicated, the range is intended to include its endpoints and all integers and fractions within the range.
In these examples, the parts and percentages are by mass unless otherwise indicated.
"parts by mass" means a basic unit of measurement showing the mass ratio of a plurality of components, and 1 part may be any unit mass, for example, 1g may be expressed, 2.689g may be expressed, and the like. If we say that the mass part of the a component is a part and the mass part of the B component is B part, the ratio a of the mass of the a component to the mass of the B component is represented as: b. alternatively, the mass of the A component is aK, and the mass of the B component is bK (K is an arbitrary number and represents a multiple factor). It is not misunderstood that the sum of the parts by mass of all the components is not limited to 100 parts, unlike the parts by mass.
"and/or" is used to indicate that one or both of the illustrated cases may occur, e.g., a and/or B include (a and B) and (a or B).
A method of reducing energy consumption in a high pressure roll milling-ball milling system, comprising:
determining the 95% sieving granularity of ore feeding of a mill and the size of closed-loop circulation sieve holes of a Bond ball mill power index test, and carrying out experiments according to the size of the closed-loop circulation sieve holes of the Bond ball mill power index test to obtain a Bond ball mill power index;
dividing ore feeding granularity composition of an ore mill according to a narrow granularity dividing principle to obtain the relative yield of each level except for the granularity below the corresponding granularity of the target ore grinding fineness;
determining the size of the multistage non-ferrous grinding medium corresponding to each narrow-grain-level mineral in the full ore feeding of the ore mill according to a calculation formula of the size of the non-ferrous grinding medium;
taking the size of the multi-stage non-ferrous grinding medium as a non-ferrous medium assembly scheme of a grinding machine to carry out non-ferrous grinding medium loading and adding, and carrying out grinding;
the calculation formula of the size of the nonferrous grinding medium is as follows:
wherein D is b The precise sphere diameter and cm are required for the ore feeding granularity d under the specific ore grinding condition; k (K) c Correcting the coefficient for the comprehensive experience; psi is the mill rotation rate,%; wib is Bond ball milling work index, kW.h/t; ρ e Is the effective density of non-iron grinding medium in ore pulp, g/cm 3 ；D 0 The diameter of the intermediate polycondensation layer of the nonferrous grinding medium in the grinding machine; d, d f The mill was fed with 95% sieve size, cm.
In an alternative embodiment, the method for determining Bond ball work index test closed cycle mesh size comprises:
dividing the target grinding fineness by 0.074 to obtain a result a, and then selecting the adjacent value of the result a in a Taylor screen sequence as the size of a closed cycle screen hole of the Bond ball mill work index test.
In an alternative embodiment, the partitioning includes: and (5) sequentially dividing the ore grinding fineness into 4-5 grades according to the ore feeding granularity of the ore grinding machine, wherein the granularity is lower than the granularity corresponding to the target ore grinding fineness.
In an alternative embodiment, the range of relative yield values for each level is controlled to be 15% to 30% and the sum of the divided levels yields adds up to 100.
Alternatively, the range of relative yield values for each level may be controlled to be any value between 15%, 20%, 25%, 30% or 15% and 30%.
After the initial relative yield value is obtained, a rounding of 5 times is generally performed.
In an alternative embodiment, the target grinding fineness corresponds to a particle size of:
the particle size corresponding to 60% -70% of 0.074mm is 0.212mm, the particle size corresponding to 70% -80% of 0.074mm is 0.15mm, and the particle size corresponding to 80% -85% of 0.074mm is 0.10mm.
In an alternative embodiment, the grinding is performed with control of the mill medium filling rate, grinding concentration and overflow fineness in classification.
In an alternative embodiment, the mill media fill is maintained at 36% -48%, the mill concentration is maintained at 75% -86%, and the overflow fineness in the classification is 60% -85%.
Alternatively, the mill media fill may be maintained at any value between 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, or 36% -48%, the mill concentration may be maintained at any value between 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, or 75% -86%, and the overflow fineness in the classification may be any value between 60%, 65%, 70%, 75%, 80%, 85%, or 60% -85%.
In an alternative embodiment, the ore feed of the mill is a high pressure mill closed circuit screen product.
In an alternative embodiment, the mill feed has a 95% screened particle size of 2.36mm to 6.7mm.
Alternatively, the mill feed 95% screened particle size may be any value between 2.36mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 6.7mm, or 2.36mm-6.7mm.
In an alternative embodiment, the non-ferrous grinding media includes, but is not limited to, grinding media of non-ferrous materials such as alumina ceramic balls, zirconia ceramic balls, and the like.
Embodiments of the present application will be described in detail below with reference to specific examples, but it will be understood by those skilled in the art that the following examples are only for illustration of the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
As shown in fig. 1, the embodiment provides a method for reducing energy consumption of a high-pressure roller grinding-ball milling system, which specifically includes the following steps:
raw materials: some molybdenum concentrating mills in Shanxi province.
1) The test sample is an undersize product which passes through a high-frequency vibrating screen after being crushed by a high-pressure roller mill, the high-pressure roller mill is GLGY0825, the hydraulic working pressure is 9MPa, the rotating speed of the roller press is 8r/min, and the maximum ore feeding granularity which is subjected to high-frequency vibrating screening is 5mm (the sieving granularity of 95% of ore feeding of a mill);
2) Closed-loop sieve pores are determined according to a closed-loop circulation sieve pore size formulation principle of Bond ball milling work index test;
according to the principle of establishing the closed cycle sieve pore size of the Bond ball mill power index test, the target grinding fineness is-0.074 mm and accounts for 73%, the closed cycle sieve pore size of the Bond ball mill power index test is 0.074/0.73 approximately equal to 0.101, the values are compared in the sieve sequence of a Taylor sieve, and the values are more approximate to 0.106 and between 0.090mm (170 meshes) and 0.106mm (140 meshes) through table lookup, so that 0.106mm is selected as the sieve pore size of the closed cycle of the Bond ball mill power index test. The Wib of the molybdenum ore was tested to be 13.16 kW.h/t.
3) Dividing the ore feeding granularity composition of the ore mill according to a narrow grain classification principle;
according to the principle of dividing the ore feeding narrow particle size fraction of the ore grinding machine, 5 grades are sequentially divided according to the granularity of 0.15mm corresponding to the target ore grinding fineness, the relative yield of each grade except for the particle size fraction below 0.15mm is calculated, and m (-5+3.35 mm), m (-3.35+2.00 mm), m (-2.00+0.85 mm), m (-0.85+0.30 mm) and m (-0.30+0.15 mm) are respectively 27.18%, 19.63%, 20.85%, 19.01% and 13.32%, and the relative yields are respectively 25%, 20% and 15% after the relative yields are rounded by multiples of 5.
4) Determining the multi-stage medium distribution size corresponding to each narrow-grain-level mineral in the full ore feeding of the ore mill according to a calculation formula of the size of the nonferrous ore grinding medium;
according to a calculation formula of the size of the nonferrous grinding medium, the sizes of the multistage nonferrous grinding medium corresponding to each narrow-size-fraction mineral in the full ore feeding of the ore grinding machine are determined to be 91.5mm, 70.1mm, 50.4mm, 36.1mm and 22.90mm respectively, and 90mm, 70mm, 50mm, 40mm and 30mm are respectively taken for the production of the grinding medium conveniently. Wherein the rotation rate of the ore mill is 80 percent, and the density of the medium is 3.6g/cm 3 ，ρ e 1.50g/cm 3 ，D 0 20.88.
The table of the integrated correction coefficient versus particle size d is shown in table 1 below:
table 1 comprehensive correction coefficient and particle size d relation table
| Particle size d/mm | 6.7 | 4.8 | 3.35 | 2.36 | 1.70 | 1.18 |
| K C | 3.55 | 3.90 | 4.37 | 4.64 | 5.50 | 7.10 |
| Particle size d/mm | 0.85 | 0.60 | 0.43 | 0.300 | 0.212 | 0.150 |
| K C | 8.78 | 12.40 | 13.42 | 15.68 | 35.49 | 41.60 |
It should be noted that: d in table 1 corresponds to the maximum size fraction for each narrow size fraction. When the correction coefficient is taken, if the grade is between the two reference grades, the correction coefficient corresponding to the two reference grades can be taken according to the principle of linear interpolation.
5) According to the non-iron ore grinding medium scheme of the ore grinding machine, the ore grinding machine is added according to the proportion of m (phi 90 mm), m (phi 70 mm), m (phi 50 mm), m (phi 40 mm), m (phi 30 mm) =25:20:20:20:15, the medium filling rate of the ore grinding machine is kept at 45%, the ore grinding concentration is kept at 75-82%, and the overflow fineness in the ore grinding classification is 70-73%.
The nonferrous grinding medium is Al 2 O 3 Ceramic balls with 92% content are in the shape of spheres.
Comparative example 1
In order to fully compare the merits of the established non-iron medium grading scheme, a field ball mill steel ball grading m (phi 80 mm): m (phi 70 mm): m (phi 60 mm) =30:40:30 is used for carrying out ore grinding comparison test, and the granularity composition of an ore grinding product and the specific energy consumption of the ball mill when two different ore grinding medium systems reach the same ore grinding fineness are studied.
Example 1 and comparative example 1 were carried out with the same feed particle size of the ball mill.
The particle size composition and specific energy consumption of the mill product of the mill comparison test are shown in Table 2.
Table 2 comparison results
After the grinding medium is replaced by the ceramic balls, the granularity of the grinding product is improved, the content of the fine particles which is minus 0.010mm is reduced, the content of the intermediate product which is minus 0.10 plus 0.020mm is increased, the time that the ceramic balls occupy 73 percent of minus 0.074mm is longer than the steel balls, but the specific energy consumption of the ceramic balls is obviously lower than that of the steel balls.
Compared with the steel ball proposal on site, the nonferrous grinding medium system obtained by the method provided by the application has the advantages that the content of the optional grain grade-0.20+0.010mm in the middle is increased by 2.28 percent, the content of the optional grain grade-0.010 mm in the middle is reduced by 4.90 percent, and the power consumption of a grinding and floating system is reduced by 26.67 percent.
Example 2
The embodiment provides a method for reducing energy consumption of a high-pressure roller grinding-ball milling system, which specifically comprises the following steps:
raw materials: henan certain molybdenum concentrating plant.
1) The model of the high-pressure roller mill on site is GM160-140, the cyclic load is about 100%, the pressure of a movable roller hydraulic cylinder is stabilized at 10MPa, and the maximum ore feeding granularity through closed-circuit screening is 6mm (the ore feeding granularity of the mill is 95 percent);
2) Closed-loop sieve pores are determined according to a closed-loop circulation sieve pore size formulation principle of Bond ball milling work index test;
according to the principle of establishing the size of a closed cycle sieve hole of a Bond ball mill power index test, the target grinding fineness is-0.074 mm and accounts for 65%, the size of the closed cycle sieve hole of the Bond ball mill power index test is 0.074/0.65 approximately 0.114, the values are compared in the sieve sequence of a Taylor sieve, and the values are more approximate to 0.106 between 0.106mm (140 meshes) and 0.125mm (120 meshes) according to the table lookup, so that 0.106mm is selected as the sieve hole size of the closed cycle of the Bond ball mill power index test. The Wib of the molybdenum ore was tested to be 11.96 kW.h/t.
3) Dividing the ore feeding granularity composition of the ore mill according to a narrow grain classification principle;
the relative yields of each grade excluding the grain fraction below 0.212mm were calculated for m (-6+4.75 mm), m (-4.75+2.36 mm), m (-2.36+0.85 mm) and m (-0.85+0.212 mm) at 15%, 30% and 25%, respectively, by dividing the grade into 4 grades in accordance with the rule of dividing the ore mill into narrow grades for ore feeding, and removing the grain size corresponding to the target fineness of the ore grinding.
4) Determining the multi-stage medium distribution size corresponding to each narrow-grain-level mineral in the full ore feeding of the ore mill according to a calculation formula of the size of the nonferrous ore grinding medium;
according to a calculation formula of the size of the nonferrous grinding medium, determining that the sizes of the multistage nonferrous grinding medium corresponding to each narrow-size-fraction mineral in the full ore feeding of the ore grinding machine are 77.4mm and 67.3 mm respectivelymm, 39.8mm and 27.1mm, which are 80mm, 70mm, 40mm and 30mm, respectively, are taken for the convenience of the production of the grinding media. Wherein the rotation rate of the ore mill is 77.4 percent and the medium density is 3.6g/cm 3 ，ρ e 1.39g/cm 3 ，D 0 20.62.
The relationship between the integrated correction factor and the particle size d is shown in table 1.
5) According to the scheme of non-iron ore grinding medium of ore grinding machineThe filling rate of the medium of the ore grinding machine is kept at 42 percent, the ore grinding concentration is kept at 75 to 86 percent, and the overflow fineness in the ore grinding classification is 62 to 65 percent.
The nonferrous grinding medium is Al 2 O 3 The ceramic balls with the content of 95 percent are in the shape of spheres.
Comparative example 2
The method comprises the steps of carrying out one-time replacement industrial test of grinding media in a factory, adding the grinding media according to a non-ferrous medium assembly scheme m (phi 80 mm) of a grinding machine, m (phi 70 mm) m (phi 40 mm) m (phi 30 mm) =15:30:30:25, carrying out grinding comparison test after a system is stable, and observing the discharge of the ball mill, overflow of a cyclone, granularity composition of a sand setting product, stage efficiency of the ball mill and the like under the condition that the ore feeding granularity of the ball mill is approximately unchanged. Under the condition that the ore feeding granularity and the grading condition of the ball mill are unchanged, after the ore grinding medium system is replaced, the granularity of an ore grinding product is improved, the content of-0.10+0.020mm particle size in a cyclone overflow product is increased, the content of-0.005 mm is reduced, and the running current of an ore grinding machine is obviously reduced.
The test comprises two parts before the test (ball mill steel ball grading scheme is m (phi 80 mm): m (phi 60 mm) =75:25) and during the test stabilization period.
The particle size composition of the cyclone overflow product and the power consumption of the flotation system before and during the stabilization period are shown in Table 3.
According to the method provided by the application, after the on-site molybdenum separation factory ore mill medium is assembled and stably produced, the content of the optional grain grade-0.10+0.020mm in the middle is improved by 3.30%, the content of the optional grain grade-0.005 mm in the middle is reduced by 18.06%, and the power consumption of a grinding and floating system is reduced by 2.2 kW.h/t.
TABLE 3 Power consumption of the grinding and flotation System for overflow products before and after the test
Example 3
As shown in fig. 1, the embodiment provides a method for reducing energy consumption of a high-pressure roller grinding-ball milling system, which specifically includes the following steps:
raw materials: a mineral processing plant for hiding a copper mine.
1) The preparation of test mineral samples adopts a CLM-25-10 type high-pressure roller mill, the diameter of the high-pressure roller mill is 250mm, the width of the high-pressure roller mill is 100mm, and the working pressure of the roller surface is 0-7N/mm 2 The roller surface speed is 0-0.52 m/s, and the distance between the working rollers is 3-8 mm. Setting the high-pressure roller grinding spacing to be 3.2mm, and setting the roller surface pressure to be 5.5N/mm 2 Screening by using a screen with the diameter of 3.5mm, returning the oversize product to a high-pressure roller mill for rolling, and uniformly mixing the undersize product for ore grinding test. The maximum ore feeding granularity of the test sample is 3.38mm (95% of the sieving granularity of ore feeding of a mill) obtained by granularity sieving;
2) Closed-loop sieve pores are determined according to a closed-loop circulation sieve pore size formulation principle of Bond ball milling work index test;
according to the principle of establishing the closed cycle sieve pore size of the Bond ball mill power index test, the target grinding fineness is-0.074 mm accounting for 80%, the Bond ball mill power index test closed cycle sieve pore size is 0.074/0.80 approximately equal to 0.093, the values are compared in the sieve sequence of a Taylor sieve, and the values are more approximate to 0.090mm (170 meshes) and 0.106mm (140 meshes) through table lookup, so that 0.090mm is selected as the sieve pore size of the Bond ball mill power index test closed cycle. The Wib of the molybdenum ore was tested to be 11.74 kW.h/t.
3) Dividing the ore feeding granularity composition of the ore mill according to a narrow grain classification principle;
according to the principle of dividing the ore feeding narrow particle size fraction of the ore grinding machine, 5 grades are sequentially divided according to the granularity of 0.10mm corresponding to the target ore grinding fineness, the relative yield of each grade except for the particle size fraction below 0.10mm is calculated, and m (-3.36+2.36 mm), m (-2.36+1.18 mm), m (-1.18+0.425 mm) and m (-0.425+0.10 mm) are 19.31%, 27.85%, 32.71% and 20.13%, and the relative yield is 20%, 30% and 20% respectively after the multiple of 5 is rounded.
4) Determining the multi-stage medium distribution size corresponding to each narrow-grain-level mineral in the full ore feeding of the ore mill according to a calculation formula of the size of the nonferrous ore grinding medium;
according to a calculation formula of the size of the nonferrous grinding medium, the sizes of the multistage nonferrous grinding medium corresponding to each narrow-size-fraction mineral in the full ore feeding of the ore grinding machine are determined to be 66.4mm, 49.4mm, 37.1mm and 25.7mm respectively, and 70mm, 50mm, 40mm and 30mm are respectively taken for the production of the grinding medium conveniently. Wherein the rotation rate of the ore mill is 78%, and the density of the medium is 3.66g/cm 3 ，ρ e 1.54g/cm 3 ，D 0 20.65.
5) According to the non-iron grinding medium scheme of the grinding machine, the filling rate of the grinding machine medium is kept at 42%, the grinding concentration is kept at 76% -84%, and the overflow fineness in the grinding classification is 78% -83%.
The nonferrous grinding medium is Al 2 O 3 The ceramic balls with the content of 95 percent are in the shape of spheres.
Comparative example 3
In order to compare the granularity characteristics of the ore grinding products corresponding to the two grading schemes with the electricity consumption of the ball mill, a grinding comparison test is developed.
Example 3 and comparative example 3 were carried out with the same feed particle size of the ball mill.
The particle size composition and specific energy consumption of the mill product of the mill comparison test are shown in Table 4.
Table 4 results of comparison
Compared with the on-site steel ball scheme, the non-iron grinding medium system obtained by the method provided by the application has the advantages that the content of the excessively fine grain fraction of-0.005 mm and the excessively coarse grain fraction of +0.10mm in the grinding product is obviously reduced, the content of the grain fraction of-0.10+0.005mm in the intermediate product is increased by 4.50%, and the specific energy consumption of the ceramic balls is 18.53% lower than that of the steel balls.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the present application and form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (1)
1. A method of reducing energy consumption in a high pressure roll milling-ball milling system, comprising:
determining the 95% sieving granularity of ore feeding of a mill and the size of closed-loop circulation sieve holes of a Bond ball mill power index test, and carrying out experiments according to the size of the closed-loop circulation sieve holes of the Bond ball mill power index test to obtain a Bond ball mill power index;
dividing ore feeding granularity composition of an ore mill according to a narrow granularity dividing principle to obtain the relative yield of each level except for the granularity below the corresponding granularity of the target ore grinding fineness;
determining the size of the multi-stage non-ferrous grinding medium corresponding to each narrow-size-fraction mineral in the full ore feeding of the ore grinding machine according to a calculation formula of the size of the non-ferrous grinding medium and the relative yield;
taking the size of the multi-stage non-ferrous grinding medium as a non-ferrous medium assembly scheme of a grinding machine to carry out non-ferrous grinding medium loading and adding, and carrying out grinding;
the calculation formula of the size of the nonferrous grinding medium is as follows:
wherein D is b The precise sphere diameter and cm are required for the ore feeding granularity d under the specific ore grinding condition; k (K) c Correcting the coefficient for the comprehensive experience; psi is the mill rotation rate,%; wib is Bond ball milling work index, kW.h/t; ρ e Is the effective density of non-iron grinding medium in ore pulp, g/cm 3 ；D 0 The diameter of the intermediate polycondensation layer of the nonferrous grinding medium in the grinding machine; d, d f Feeding ore to a mill to obtain 95% sieving granularity, cm;
the K is c The following table shows:
The method for determining the size of the closed-loop circulation sieve pore of the Bond ball mill power index test comprises the following steps:
dividing 0.074 by the target grinding fineness to obtain a result a, and then selecting the adjacent value of the result a in a Taylor sieve sequence as the size of a closed cycle sieve pore of the Bond ball mill work index test;
the dividing includes: sequentially dividing 4-5 grades according to the ore feeding granularity of an ore grinding machine below the granularity corresponding to the target ore grinding fineness;
the range of the relative yield value of each level is controlled to be 15-30%, and the sum of the yields of all levels is 100;
the granularity corresponding to the target grinding fineness is as follows:
-0.074mm to 60% -70% of the corresponding particle size is 0.212mm, -0.074mm to 70% -80% of the corresponding particle size is 0.15mm, -0.074mm to 80% -85% of the corresponding particle size is 0.10mm;
when ore grinding is executed, controlling the medium filling rate, the ore grinding concentration and the overflow fineness in classification of the ore grinder;
the medium filling rate of the ore mill is kept between 36 and 48 percent, the ore grinding concentration is kept between 75 and 86 percent, and the overflow fineness in the classification is between 60 and 85 percent;
the ore feeding of the ore mill is a closed-circuit screening product of a high-pressure roller mill;
the ore feeding of the mill is carried out, and the 95% sieving granularity is 2.36mm-6.7mm;
the nonferrous grinding media includes ceramic balls of alumina and/or ceramic balls of zirconia.
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