Method for determining diameter of mineral steel ball harder than gangue mineral and used for grinding valuable mineral

A technology of useful minerals and determination methods, applied in the application of stable tension/pressure testing material strength, grain processing, testing material hardness, etc. There are deviations and other problems to achieve the effect of enhancing the content of the intermediate easy-to-select particle size, reasonable particle size composition, and reducing the particle size content

Active Publication Date: 2015-06-03
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this formula has two problems: ① The ultimate compressive strength in the formula reflects the hardness of the whole ore, which can be expressed by the Platts hardness coefficient, but the Platts hardness coefficients of various minerals in the ore are different, and the overall hardness The steel ball diameter calculated by replacing the different hardness of various minerals (not exactly the average value) is effective for the overall ore, but it is inevitable that some useful minerals have no monomer dissociation, and some gangue minerals are too crush
[0008] Therefore, for specific ores whose useful minerals are harder than gangue minerals, the steel ball diameters of useful hard minerals and gangue soft ores should be ground as far as possible, but the current calculation methods and formulas have deviations

Method used

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  • Method for determining diameter of mineral steel ball harder than gangue mineral and used for grinding valuable mineral
  • Method for determining diameter of mineral steel ball harder than gangue mineral and used for grinding valuable mineral
  • Method for determining diameter of mineral steel ball harder than gangue mineral and used for grinding valuable mineral

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Effect test

Embodiment 1

[0031] Embodiment 1: as figure 1 As shown, a method for determining the diameter of a steel ball for grinding useful minerals harder than gangue minerals, the specific steps of the method are as follows:

[0032] Step1. Determination of ore mechanical properties

[0033] Select n pieces of ore whose length, width and height are greater than 20cm before coarse crushing, cut into cylindrical standard specimens of the same standard, measure the uniaxial compressive strength of each standard specimen on the material testing machine and calculate the arithmetic mean of the measurement results Value as ore uniaxial compressive strength σ 压 ; At the same time, use the scratch method to measure the Mohs hardness m of various pure minerals in the raw ore j ;

[0034] Step2. Determination of relative content of minerals

[0035] Use point measurement or line measurement on a microscope to determine the relative content of various minerals in raw oreγ i ; determine the relative prop...

Embodiment 2

[0042] Embodiment 2: as figure 1 As shown, a method for determining the diameter of a steel ball for grinding useful minerals harder than gangue minerals, the specific steps of the method are as follows:

[0043] Step1. Determination of ore mechanical properties

[0044] Select n pieces of ore whose length, width and height are greater than 20cm before coarse crushing, cut into cylindrical standard specimens of the same standard, measure the uniaxial compressive strength of each standard specimen on the material testing machine and calculate the arithmetic mean of the measurement results Value as ore uniaxial compressive strength σ 压 ; At the same time, use the scratch method to measure the Mohs hardness m of various pure minerals in the raw ore j ;

[0045] Step2. Determination of relative content of minerals

[0046] Use point measurement or line measurement on a microscope to determine the relative content of various minerals in raw oreγ i ; determine the relative prop...

Embodiment 3

[0051] Embodiment 3: as figure 1 As shown, a method for determining the diameter of a steel ball for grinding useful minerals harder than gangue minerals, the specific steps of the method are as follows:

[0052] Raw material: Copper-bearing pyrrhotite from Dongguashan Copper Mine in Anhui Province

[0053] (1) Determination of ore mechanical properties

[0054] Before coarse crushing, select 10 pieces of ore whose length, width and height are greater than 20cm, cut them into standard 5×5×10cm or 4×4×8cm cylindrical standard test pieces, and measure the uniaxiality of each ore test piece on a material testing machine Compressive strength, calculate the arithmetic mean σ of the measurement results 压 5505kg / cm 2 . In addition, the Mohs hardness of chalcopyrite is 6, that of pyrite is 6.5, that of pyrrhotite is 4, that of magnetite is 6, and that of serpentine is measured by scratch method. The Mohs hardness of chlorite is 3.5, the Mohs hardness of chlorite is 2.5, and the M...

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Abstract

The invention relates to a method for determining the diameter of a mineral steel ball harder than gangue mineral and used for grinding valuable mineral, belonging to the ore grinding field of mineral separation. According to the method, first, the uniaxial compressive strength sigma pressure of minerals and the Moh's hardness mj of each pure mineral are detected; then the relative ratio gamma j of each pure mineral to the main pure minerals is detected; finally, each process parameter of a kominuter and the detected sigma pressure, mj and gamma j are substituted into a steel ball diameter calculation formula, so that the diameter of the steel ball is calculated. The defect in diameter calculation of the steel ball by a traditional empirical formula and a semi-theoretical formula for the ball diameter is overcome; when the steel ball diameter calculated with the method is applied to a ball mill, the particle size composition of ore grinding products is more reasonable, the content of course-level hard-to-grind particles can be reduced, the content of easily-argillitized serpentinite and talc over crushing particles can also be obviously reduced, and the content of the medium easy-to-separate particles is greatly increased, so that the metal recovery rate is effectively improved, and the recycle of the valuable minerals is realized.

Description

technical field [0001] The invention relates to a method for determining the diameter of a steel ball for grinding useful minerals harder than gangue minerals, and belongs to the field of ore grinding in ore dressing. Background technique [0002] As a traditional grinding equipment, the grinding machine has a history of more than 100 years. Grinding machines are widely used in metallurgy, chemical industry, cement, ceramics, construction, thermal power, medicine and national defense industries. Especially in the beneficiation department in the metallurgical industry, the grinding operation has a very important position. The investment in ore crushing and grinding in the concentrator accounts for about 60% of the total investment of the whole plant, and even more than 75% in the magnetic separation plant. more than 40% of. In 2011, the consumption of steel balls and liners in national ball mills reached more than 3 million tons. Constructing a resource-saving society and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C17/20G01N3/08G01N3/42
CPCB02C17/20G01N3/08G01N3/42
Inventor 肖庆飞王周和赵红芬胡新付汪太平邓禾淼秦洪训王彩霞李进友
Owner KUNMING UNIV OF SCI & TECH
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