CN114130531A - Method for improving utilization coefficient of primary ball mill in grinding and selecting process - Google Patents
Method for improving utilization coefficient of primary ball mill in grinding and selecting process Download PDFInfo
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- CN114130531A CN114130531A CN202111494815.6A CN202111494815A CN114130531A CN 114130531 A CN114130531 A CN 114130531A CN 202111494815 A CN202111494815 A CN 202111494815A CN 114130531 A CN114130531 A CN 114130531A
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- 238000000227 grinding Methods 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 11
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000005415 magnetization Effects 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 238000007885 magnetic separation Methods 0.000 claims description 16
- 239000012141 concentrate Substances 0.000 claims description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 12
- 239000011707 mineral Substances 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000006148 magnetic separator Substances 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
Classifications
-
- 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
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- 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
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
Abstract
The invention relates to a metallurgical mine engineering technology, in particular to a method for improving the utilization coefficient of a primary ball mill in a grinding and selecting process, which comprises the following steps: step one, roughing the grading granularity of primary grinding ore; step two, according to the fact that the specific magnetization coefficient of lean magnetite ore is lower in coarse granularity, the magnetic field intensity needs to be increased when the separation recovery rate is improved; step three, if the whole production flow is secondary grinding, the number of secondary grinding machines is increased; step four, the whole production flow is three-stage ore grinding, and the coarse and two-stage ore grinding can be performed to classify the granularity. After the technology is adopted, the utilization coefficient of a ball mill of a first-stage mining company, Taigang mining division, Bixian county, and Miniao corporation is increased to 4.27 t/mn from 3.43 t/mn, the utilization coefficient of the ball mill is increased by 24.49%, the unit consumption of steel balls is reduced to 0.969kg/t from 1.03kg/t, and the unit consumption of electricity is reduced to 16.19kwh/t from 17.28 kwh/t.
Description
Technical Field
The invention relates to a metallurgical mine engineering technology, in particular to a method for improving the utilization coefficient of a primary ball mill in a grinding and selecting process.
Background
In the grinding and dressing production in metallurgical mine engineering, the production cost of the grinding operation accounts for more than 60% of the whole mineral dressing production cost, so mineral dressing production enterprises pay attention to the economic and technical index of improving the utilization coefficient of a ball mill, which marks the high and low production efficiency. But the requirement of the final ore grinding granularity limits the random improvement of the utilization coefficient of the ball mill due to the limitation of the standard-reaching requirement of the product quality. Particularly, as the mining depth is increased in most mine enterprises, the mineral embedding granularity is generally thinned, the quality of the original produced concentrate is kept unchanged, fine grinding is inevitably needed, the utilization coefficient of the ball mill is greatly reduced, the productivity is reduced, and the production cost is increased. The more crushing and less grinding are another effective measure for improving the utilization coefficient of the ball mill and reducing the production cost in the metallurgical mine. On the basis of keeping the original grinding and selecting process, the reduced ground-in particle size cannot necessarily play a role in improving the utilization coefficient of the primary ball mill due to the limitation of the subsequent two-stage grinding capability and the three-stage grinding capability of the primary grinding, namely, the production process flow with large opening and small opening also becomes a main factor for limiting the great improvement of the utilization coefficient of the primary ball mill. Based on the analysis, it is particularly necessary to research a process method which can not only ensure that the product quality reaches the standard on the premise of not losing the metal recovery rate, but also improve the utilization coefficient of the ball mill for grinding and selecting once and reduce the production cost.
Disclosure of Invention
The invention aims to solve the problems and provides a method for improving the utilization coefficient of a primary ball mill in a grinding and selecting process.
The purpose of the invention is realized as follows: a method for improving the utilization coefficient of a primary ball mill in a grinding and selecting process comprises the following steps:
step one, roughing the grade granularity of the primary grinding, and calculating the increase of the processing capacity of the primary grinding machine according to the grinding work index, wherein the increase is 24-36% of the original ore amount;
step two, according to the fact that the specific magnetization coefficient of lean magnetite ore in coarse granularity is lower, the magnetic field intensity needs to be increased when the separation recovery rate is improved, the magnetic field intensity of a first-stage magnetic separator is improved to 120-200 kA/m, and the grade of magnetic iron of magnetic separation tailings is reduced;
step three, the whole production flow is two-stage ore grinding, and the increased treatment capacity of the first-stage grinding mill and the increased ore amount after the recovery rate is improved by one-stage magnetic separation are digested by increasing the number of the second-stage grinding mills which is 50 to 60 percent of the number of the original second-stage grinding mills, increasing the ore grinding capacity of the second-stage ore grinding process and increasing the volume amount by 50 to 60 percent; and the ore quantity distribution is performed according to the ore grinding capacity of each grinding machine of the two grinding machines, and the conveying capacity of the process pipeline for conveying the ore quantity is controllable.
Step four, the whole production flow is three-stage ore grinding, the coarse two-stage ore grinding grading granularity can be released, the number of the three-stage mills can be increased to 50% -60% of the number of the original three-stage mills by increasing the number of the three-stage mills, the ore grinding capacity of the three-stage ore grinding procedure is properly increased, the increase range is 50% -60% of the volume of the two-stage ore grinding, the increased treatment capacity of the one-stage mill and the increased ore quantity after the recovery rate is improved by one-stage magnetic separation are digested, and the ore quantity distribution is performed according to the ore grinding capacity of each mill of the three mills, and the controllability of the conveying capacity of a process pipeline is realized.
Furthermore, the principle of roughing in the step two is not to reduce the metal recovery rate of the concentrate during primary magnetic separation and early polishing, and simultaneously reduce the ore grinding operation of the gangue minerals which are difficult to grind, namely, for the Anshan type metamorphic sedimentary rock lean magnetite ore, the grade of the magnetic iron of the tailings which are early polished after primary grinding is less than or equal to 0.40 percent.
Further, quantitative distribution is carried out on the ore grinding capacity and the ore quantity of each grinding machine in the third step and the second step.
Further, quantitative distribution is carried out on the ore grinding capacity and the ore quantity of each mill in the fourth step, the third step and the fourth step.
The invention has the beneficial effects that:
the volume production process of the mill for increasing the two-stage and three-stage ore grinding procedures adopted by the invention effectively reduces unit ball consumption and power consumption on the premise of ensuring that the granularity of the final product is not changed or increased, and does not cause the reduction of the quality of the final concentrate and the increase of the metal loss rate.
After the technology is adopted, the utilization coefficient of a ball mill of a first-stage mining company, Taigang mining division, Bixian county, and Miniao corporation is increased to 4.27 t/mn from 3.43 t/mn, the utilization coefficient of the ball mill is increased by 24.49%, the unit consumption of steel balls is reduced to 0.969kg/t from 1.03kg/t, and the unit consumption of electricity is reduced to 16.19kwh/t from 17.28 kwh/t.
Detailed Description
The invention provides a method for improving the utilization coefficient of a primary ball mill in a grinding and selecting process. The method solves the production strange phenomenon that the grinding granularity is reduced and the utilization coefficient of the ball mill does not rise and fall once, improves the productivity of the production process and relatively reduces the production cost under the condition that the final grinding fineness is not required to be changed or is required to be improved. The invention also provides a new mineral processing process design concept of the metallurgical mine, which is applied to the production field of lean magnetite ore by grinding, namely, the characteristic that minerals are easier to grind than gangue is fully utilized, the ore grinding capacity of a subsequent ball mill for coarse grain preselection is properly increased, and the control of the production cost is facilitated on the whole process.
The invention provides a method for improving the utilization coefficient of a primary ball mill in a grinding and separation process, which is characterized in that gangue which is relatively difficult to grind is early thrown according to the mineral characteristics of lean magnetite ore and the requirements of production products, and the ore grinding capacity of enriched ore is properly increased, so that the energy conservation and consumption reduction of the whole production process are realized. The primary grinding classification granularity required by the process method is properly coarsened, and the coarsening principle is that the metal recovery rate of the concentrate during primary magnetic separation and early polishing is not reduced. For the Anshan type metamorphic sedimentary rock lean magnetite ore, the grade of the magnetic iron of the tailings thrown early after the first grinding is not more than 0.40 percent. When the process is used for secondary grinding, the grinding capacity is required to be increased according to the increased ore amount of the primary grinding and the increment condition of the target ore after the enrichment of the raw ore, or the secondary subsequent grinding capacity is increased according to the enrichment degree of the target ore after the early throwing enrichment. For the raw ore with the grade of magnetic iron less than or equal to 18 percent and the product needing to be ground to-0.045 mm82 percent after reaching the standard (0.045 mm82 percent is called as granularity or fineness in the metallurgical mineral separation engineering), the method is popular, namely 100 g of powdery mineral is sieved by a sieve with a sieve hole of 0.045mm, the sieving amount is 82 g, and the residual sieve has the level of the gram particle size which is larger than 0.045 mm), and the proper proportion of the capacity increase of a subsequent mill for primary ore grinding is 50-60 percent.
The process comprises the following steps:
1) the content of the first-stage grinding grading granularity of-0.074 mm is reduced by more than 5 percent;
2) the magnetic field intensity of the primary magnetic separation is increased, the tail magnetic grade is controlled not to exceed 0.40% during early throwing, and the metal recovery rate is improved;
3) and (4) according to the increased concentrate amount of the primary magnetic separation concentrate and the ore grinding work index accounting of the enriched minerals, properly increasing the volume of a secondary ore grinding mill and a tertiary ore grinding mill, and keeping the ore grinding granularity required by the quality standard of the final product.
The invention specifically comprises the following process steps:
1) reducing the grading granularity of-0.074 mm55% of the first-stage grinding of the Taigang mining division Bin county mining Limited company to the level of-0.074 mm45%, and determining the maximum processing capacity of the first-stage grinding machine to be 735t/h according to the calculation of the grinding work index.
2) The magnetic field intensity of the first-stage magnetic separator is improved from 79kA/m to 120kA/m, and the grade of the magnetic iron in the first-stage magnetic tailings can be controlled within 0.35% under the condition that the first-stage grinding classification products are coarse.
3) The concentrate ore separation box for the first-stage magnetic separation and the second-stage ore grinding classification procedure is changed from four-way ore separation into five-way ore separation, the ore quantity distribution is performed according to the ore grinding capacity of each grinding machine of the second grinding, and the process pipeline conveying capacity of the conveyed ore quantity is controllable.
4) And the concentrate ore separation box for the second-stage magnetic separation and the third-stage ore grinding classification process is changed from two-way ore separation into three-way ore separation, and the ore quantity distribution is performed according to the ore grinding capacity of each grinding machine of the three grinding machines, and the conveying capacity of a process pipeline for conveying the ore quantity is controllable.
5) In the third step, the process needs to increase the ore grinding capacity according to the increase of the first-stage ore grinding and the increase of the target ore after the raw ore is enriched when the second-stage ore grinding is performed, or in the fourth step, the process needs to increase the three-stage ore grinding capacity according to the increase of the first-stage ore grinding and the increase of the target ore after the raw ore is enriched when the third-stage ore grinding is performed.
6) For lean magnetite grinding operation with the grade of the magnetic iron of the raw ore less than or equal to 18 percent and the product reaching the standard and needing to be ground to the level of-0.045 mm82 percent, the proportion of the capacity of the primary ore grinding subsequent mill is increased by 50 to 60 percent, and the utilization coefficient of the primary ball mill can be increased by 24.50 to 36.50 percent.
Example one
In a certain selection plant, the grade of the magnetic iron of the raw ore is only 14%, the original ore dressing process is a two-stage ore grinding and grading four-stage selection process, the first-stage ore grinding is carried out by two MQG2136 ball mills with a total volume of 21.60m, the second-stage ore grinding is carried out by two MQY1854 ball mills with a total volume of 27m, and the final ore grinding fineness is-0.074 mm 76%. The annual grade of the iron ore concentrate powder is 65 percent, and 13 ten thousand tons of the iron ore concentrate powder are produced. And carrying out high-speed rice milling at one time by utilizing the coefficient of 3.34 t/m.
By applying the invention, 1) the grading granularity of-0.074 mm45% of the primary grinding is reduced to the level of-0.074 mm38%, and the maximum processing capacity of the primary grinding mill is determined to be 98.50t/h according to the calculation of the grinding work index.
2) The magnetic field intensity of the first-stage magnetic separator is improved from 79kA/m to 180kA/m, and the grade of the magnetic iron in the first-stage magnetic separation tailings can be controlled to be 0.32% under the condition that the first-stage grinding classification products are coarse.
3) 1 additional MQY1854 ball mill is added to the second stage grinding, the concentrate ore separating box of the first stage magnetic separation entering the second stage grinding grading process is changed from four-way ore separating into five-way ore separating, and the control of equal distribution of ore amount and route start and stop is performed according to the equal volume of 3 second grinding mills.
Under the condition that the final grinding fineness is unchanged, the utilization coefficient of the ball mill for one time is increased to 4.56t/m and the speed of the high-speed high-.
Example two
In a certain selection plant, the grade of the magnetic iron of the raw ore is only 12%, the original ore dressing process is a two-stage ore grinding and grading four-stage selection process, the first-stage ore grinding is carried out by two MQG2236 ball mills with a total volume of 22.60m, the second-stage ore grinding is carried out by two MQY2145 ball mills with a total volume of 27m and a final ore grinding fineness of-0.074 mm 79%. The annual grade of the iron ore concentrate powder is 65 percent, and 11 ten thousand tons of the iron ore concentrate powder are produced. And carrying out high-speed rice milling by the aid of the ball mill for one time with the utilization coefficient of 2.70 t/m.
By applying the invention, 1) the grading granularity of-0.074 mm45% of the primary grinding is reduced to the level of-0.074 mm38%, and the maximum processing capacity of the primary grinding mill is determined to be 83.17t/h according to the calculation of the grinding work index.
2) The magnetic field intensity of the first-stage magnetic separator is improved from 79kA/m to 200kA/m, and the grade of the magnetic iron in the first-stage magnetic separation tailings can be controlled to be 0.30% under the condition that the first-stage grinding classification products are coarse.
3) The number of the two-stage grinding ball mill is kept unchanged, but the grading particle size is reduced from-0.074 mm79% to-0.074 mm 72%.
4) Three-stage ore grinding is added, and MQY1854 ball mills 1 are added. And under the condition that the final grinding fineness needs to be improved to-0.074 mm91%, the utilization coefficient of the ball mill is improved to 3.68t/m for carrying out the high speed cultivation h, and the utilization coefficient is improved by 36.30%.
The invention can effectively control the increase of the production cost and has high practicability for improving the production efficiency of mineral processing enterprises.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (4)
1. A method for improving the utilization coefficient of a primary ball mill in a grinding and selecting process is characterized by comprising the following steps: the method comprises the following steps:
step one, roughing the grade granularity of the primary grinding, and calculating the increase of the processing capacity of the primary grinding machine according to the grinding work index, wherein the increase is 24-36% of the original ore amount;
step two, according to the fact that the specific magnetization coefficient of lean magnetite ore in coarse granularity is lower, the magnetic field intensity needs to be increased when the separation recovery rate is improved, the magnetic field intensity of a first-stage magnetic separator is improved to 120-200 kA/m, and the grade of magnetic iron of magnetic separation tailings is reduced;
step three, the whole production flow is two-stage ore grinding, and the increased treatment capacity of the first-stage grinding mill and the increased ore amount after the recovery rate is improved by one-stage magnetic separation are digested by increasing the number of the second-stage grinding mills which is 50 to 60 percent of the number of the original second-stage grinding mills, increasing the ore grinding capacity of the second-stage ore grinding process and increasing the volume amount by 50 to 60 percent; and emphasizes on carrying out ore quantity distribution according to the ore grinding capacity of each grinding machine of the two grinding machines and realizing controllability on the conveying capacity of a process pipeline for conveying the ore quantity;
step four, the whole production flow is three-stage ore grinding, the coarse two-stage ore grinding grading granularity can be released, the number of the three-stage mills can be increased to 50% -60% of the number of the original three-stage mills by increasing the number of the three-stage mills, the ore grinding capacity of the three-stage ore grinding procedure is properly increased, the increase range is 50% -60% of the volume of the two-stage ore grinding, the increased treatment capacity of the one-stage mill and the increased ore quantity after the recovery rate is improved by one-stage magnetic separation are digested, and the ore quantity distribution is performed according to the ore grinding capacity of each mill of the three mills, and the controllability of the conveying capacity of a process pipeline is realized.
2. The method for improving the utilization coefficient of the primary ball mill in the grinding and selecting process according to claim 1, which is characterized in that: the principle of roughing in the step two is that the metal recovery rate of the concentrate during primary magnetic separation and early polishing is not reduced, and meanwhile, the ore grinding operation of the gangue minerals difficult to grind is reduced, namely, the grade of the magnetic iron of the tailings early polished after the primary grinding is less than or equal to 0.40% for the Anshan type metamorphic sedimentary rock lean magnetite ore.
3. The method for improving the utilization coefficient of the primary ball mill in the grinding and selecting process according to claim 1, which is characterized in that: in the third step, the ore grinding capacity and the ore quantity of each grinding machine are quantitatively distributed.
4. The method for improving the utilization coefficient of the primary ball mill in the grinding and selecting process according to claim 1, which is characterized in that: in the fourth step, the grinding capacity and the ore quantity of each grinding machine are quantitatively distributed.
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2021
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