CN113751143B - Method for determining uniaxial compressive strength of non-actual ore - Google Patents

Method for determining uniaxial compressive strength of non-actual ore Download PDF

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CN113751143B
CN113751143B CN202110974891.0A CN202110974891A CN113751143B CN 113751143 B CN113751143 B CN 113751143B CN 202110974891 A CN202110974891 A CN 202110974891A CN 113751143 B CN113751143 B CN 113751143B
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ore
grinding
compressive strength
actual
uniaxial compressive
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CN113751143A (en
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从金瑶
涂博
彭佳志
祁庆龙
李新新
杨铁龙
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Wuhan Sanyuan Speical Building Materials Co Ltd
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    • 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
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Abstract

The invention discloses a method for determining uniaxial compressive strength of non-actual ore, which comprises the following steps: crushing, screening and analyzing the non-actual ore material to be detected, determining the particle size composition of the material to be detected, and classifying according to the particle size; selecting one or more actual ores as comparison materials, performing crushing and screening, determining the granularity composition of the comparison materials, and classifying according to the same size fraction as that of the materials to be detected; carrying out ore grinding tests on the material to be detected and the comparison material on the same mill according to the same granularity composition, the same grinding quality and the same ore grinding condition, and drawing an ore grinding curve; and determining the time required for grinding to the same fineness according to the grinding curve, and substituting the time into a formula to calculate the uniaxial compressive strength of the material to be measured. The method can accurately determine the uniaxial compressive strength of the non-actual ore, is simple and reliable in operation method, and is suitable for theoretical calculation of material crushing and grinding.

Description

Method for determining uniaxial compressive strength of non-actual ore
Technical Field
The invention belongs to the technical field of ore grinding, and particularly relates to a method for determining uniaxial compressive strength of non-actual ore.
Background
In the technical field of mineral grinding, the uniaxial compressive strength of a material to be ground is directly related to the difficulty and easiness in grinding of the material, and is a key parameter when a scheme of ball milling and ball filling for the material is designed. In engineering application, the uniaxial compressive strength of actual ore can be directly tested after being processed and cut into blocks or directly inquired through a tool book. However, for non-actual ores such as smelting byproducts (slag, steel slag, electric slag, manganese slag, phosphorus slag and the like), calcined products (coal slag, furnace slag, brick and tile ceramics, calcined ore and the like), building solid waste and the like, the uniaxial compressive strength is difficult to test due to various factors such as non-uniform surface morphology specifications, non-uniform granulation fineness and the like. In the non-actual ore grinding, a method capable of accurately determining the uniaxial compressive strength of a grinding material is needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method capable of accurately determining uniaxial compressive strength of non-actual ore.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for determining uniaxial compressive strength of non-actual ore, comprising the steps of:
s1, crushing, screening and analyzing non-actual ore materials to be detected, determining the particle size composition of the materials to be detected, and classifying the materials according to the particle size;
s2, selecting one or more actual ores as comparison materials, carrying out crushing and screening, determining the granularity composition of the comparison materials, and classifying according to the same size fraction as that of the materials to be detected;
s3, performing a grinding test on the material to be detected and the comparison material on the same grinding machine according to the same granularity composition, the same grinding quality and the same grinding condition, and drawing a grinding curve;
s4, determining the time required for grinding to the same fineness according to the ore grinding curve, and substituting the time into a formula to calculate the uniaxial compressive strength of the material to be measured; the formula is
Figure BDA0003226945750000011
Wherein σ Side survey Uniaxial compressive strength, sigma, of the material to be measured Fruit of Chinese wolfberry Is the uniaxial compressive strength, t, of the actual ore Measuring Time t required for grinding the material to be measured to the same fineness Fruit of Chinese wolfberry The time, rho, required for actual ore grinding to reach the same fineness Measuring Is the density of the material to be measured, rho Fruit of Chinese wolfberry The density of the actual ore is K, the proportionality coefficient related to the sphericity of the two materials is K, and a is the proportionality coefficient between the mass of the ground material and the mass of the steel ball.
Preferably, the mill is a laboratory
Figure BDA0003226945750000021
A discontinuous ball mill.
Preferably, the ore grinding conditions comprise a primary ball scheme and a filling rate.
More preferably, the scheme of the primary balls is that the mass specific gravity of each ball with each diameter is
Figure BDA0003226945750000022
Figure BDA0003226945750000023
More preferably, the filling ratio is 30%.
Preferably, the ore grinding curve is a relationship curve of 80 μm screen residue of the product and ore grinding time.
Preferably, the grinding is carried out until the same fineness is obtained, and the ground powder is ground until the mass fraction of the 80 mu m screen residue is less than or equal to 10%.
Preferably, the K value is the ratio of the sphericity of two materials, the sphericity Q being according to the published formula Q = (d) L /d stk ) 2/3 Calculation of where d L Equivalent diameter of particles, d, measured by sedimentation stk The equivalent diameter of the particles measured by the laser diffraction method.
According to the invention, through grinding comparison of the non-actual ore and the actual ore, the relationship between the uniaxial compressive strength of the non-actual ore and the grinding time is established, the uniaxial compressive strength of the non-actual ore can be accurately determined, the operation method is simple and reliable, and the method is suitable for theoretical calculation of material crushing and grinding.
Drawings
FIG. 1 is a grinding curve of each material in example 1.
FIG. 2 is a grinding curve of each material in example 2.
Detailed Description
The technical solutions of the present invention will be described in detail and fully with reference to the following specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1
The method for determining the uniaxial compressive strength of the heavy steel granulated blast furnace slag comprises the following steps of:
after being dried by a 105 ℃ oven, the heavy steel granulated blast furnace slag of the material to be detected is subjected to particle size analysis, and the particle size distribution result is as follows: 8.11 percent of 1.43mm, 10.33 percent of 1.43-1.0 mm, 20.28 percent of 1.0-0.8 mm, 20.26 percent of 0.8-0.6 mm, 27.71 percent of 0.6-0.4 mm and 13.30 percent of-0.4 mm.
Limestone in Yichang area of Hubei is selected as a comparison material of actual ore, one part of the limestone is cut into standard cubic test blocks of 70mm +/-2 mm for uniaxial compressive capacity test, and the average uniaxial compressive strength is 325.2kg/cm 2 (ii) a And after the other part of the limestone is crushed by a jaw crusher in the laboratory, screening and re-grading by using a screen mesh which is the same as the screen mesh of the material to be detected, so that the particle size distribution of the limestone is consistent with that of the material to be detected.
The dry densities of the two materials are tested by a hydrometer method, and the density of a heavy steel granulated blast furnace slag sample is measured to be 1.92g/cm 3 The density of the limestone sample is 2.96g/cm 3 。
Using a laboratory
Figure BDA0003226945750000031
The discontinuous ball mill is used for ore grinding test, and the ore grinding balls are prepared from
Figure BDA0003226945750000032
12kg of steel ball,
Figure BDA0003226945750000033
20kg of steel balls,
Figure BDA0003226945750000034
18kg of steel balls,
Figure BDA0003226945750000035
10kg of steel ball,
Figure BDA0003226945750000036
40kg of forged steel with a filling rate of 30%. Grinding 5.0kg of each ground ore material, and respectively drawing grinding curves of the material to be measured and the actual ore, wherein each grinding curve is 80 muThe relationship curve of the m screen residue and the ore grinding time is shown in figure 1. The fineness requirement is that the residual mass fraction of the sieve with the particle size of 80 mu m is less than or equal to 20 percent, and the theoretical shortest grinding time required by the heavy steel slag of the material to be detected and the limestone of the comparative material is respectively 38.3min and 12.9min.
Substituting the above parameters into a calculation formula
Figure BDA0003226945750000037
Where ρ is Fruit of Chinese wolfberry ＝2.96g/cm 3 ，ρ Measuring ＝1.92g/cm 3 ，t Fruit of Chinese wolfberry ＝12.9min，t Measuring ＝38.3min，σ Fruit of Chinese wolfberry ＝325.2kg/cm 2 ，a＝0.05，ρ Ball with ball-shaped section K =1 according to the sphericity contrast of the ground product, and calculating to obtain sigma =7.80g/cm3 Measuring ＝1400kg/cm 2 。
Example 2
The method for determining the uniaxial compressive strength of the heavy steel granulated blast furnace slag comprises the following steps of:
after being dried by a 105 ℃ oven, the heavy steel granulated blast furnace slag of the material to be detected is subjected to particle size analysis, and the particle size distribution result is as follows: 8.11 percent of the grade with the grain size of +1.43mm, 10.33 percent of the grade with the grain size of 1.43-1.0 mm, 20.28 percent of the grade with the grain size of 1.0-0.8 mm, 20.26 percent of the grade with the grain size of 0.8-0.6 mm, 27.71 percent of the grade with the grain size of 0.6-0.4 mm and 13.30 percent of the grade with the grain size of-0.4 mm.
Selecting granite in Hubei Jingmen area as actual ore comparison material, cutting a part of granite blocks into 70mm + -2 mm standard cube test blocks, and testing uniaxial compressive capacity to obtain average uniaxial compressive strength of 1030kg/cm 2 (ii) a And after the other part of granite is crushed by a jaw crusher in a laboratory, screening and regrading by using a screen mesh which is the same as the screen mesh of the material to be detected, so that the particle size distribution of the granite is consistent with that of the material to be detected.
The dry densities of the two materials are tested by a hydrometer method, and the density of a heavy steel granulated blast furnace slag sample is measured to be 1.92g/cm 3 The density of the granite sample is 3.24g/cm 3 。
Using a laboratory
Figure BDA0003226945750000041
The discontinuous ball mill is used for ore grinding test, and the ore grinding balls are prepared from
Figure BDA0003226945750000042
12kg of steel ball,
Figure BDA0003226945750000043
20kg of steel balls,
Figure BDA0003226945750000046
18kg of steel balls,
Figure BDA0003226945750000047
10kg of steel ball,
Figure BDA0003226945750000044
40kg of forged steel with a filling rate of 30%. 5.0kg of each ground material is subjected to grinding test, and a grinding curve of the material to be tested and the actual ore is respectively drawn, wherein a relationship curve of the 80-micron screen residue of each material and the grinding time is shown in figure 2. The fineness requirement is that the residual mass fraction of 80 mu m is less than or equal to 20 percent, and the theoretical shortest grinding time required by the heavy steel slag of the material to be detected and the granite of the comparison material is respectively 38.3min and 45min.
Substituting the above parameters into a calculation formula
Figure BDA0003226945750000045
Where ρ is Fruit of Chinese wolfberry ＝3.24g/cm 3 ，ρ Measuring ＝1.92g/cm 3 ，t Fruit of Chinese wolfberry ＝44min，t Measuring ＝38.3min，σ Fruit of Chinese wolfberry ＝1030kg/cm 2 ，a＝0.05，ρ Ball with ball-shaped section K =1.02 according to the sphericity contrast of the ground product, and calculating to obtain sigma & lt 7.80g/cm & lt 3 & gt Measuring ＝1405kg/cm 2 。
Comparing the example 1 with the example 2, it can be seen that the uniaxial compressive strength error of the heavy steel granulated blast furnace slag obtained by calculation is extremely small by adopting two different actual ores for comparison, which shows that the uniaxial compressive strength of the non-actual ores can be accurately determined by the method provided by the invention.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein are included in the scope of the present invention, and the scope of the present invention is subject to the scope of the claims.

Claims (8)

1. A method for determining uniaxial compressive strength of non-actual ore, comprising the steps of:
s1, screening the non-actual ore materials to be detected, determining the particle size composition of the materials to be detected, and classifying the materials according to the particle size; the non-actual ore is a smelting byproduct, a calcination byproduct or a construction solid waste;
s2, selecting one or more actual ores as comparison materials, performing crushing and screening, determining the particle size composition of the comparison materials, and classifying the comparison materials according to the same size fraction as the materials to be detected;
s3, carrying out an ore grinding test on the material to be detected and the comparison material on the same grinding machine according to the same granularity composition, the same grinding quality and the same ore grinding condition, and drawing an ore grinding curve;
s4, determining the time required for grinding to the same fineness according to the ore grinding curve, and substituting the time into a formula to calculate the uniaxial compressive strength of the material to be measured; the formula is
Figure FDA0003817704480000011
Wherein σ Measuring For uniaxial compressive strength, sigma, of the material to be measured Fruit of Chinese wolfberry Is the uniaxial compressive strength, t, of the actual ore Measuring Time t required for grinding the material to be measured to the same fineness Fruit of Chinese wolfberry The time, rho, required for actual ore grinding to reach the same fineness Measuring Is the density of the material to be measured, rho Fruit of Chinese wolfberry For the density of the actual ore, K is the proportionality coefficient related to the sphericity of the two materials, a Fruit of Chinese wolfberry And a Measuring The mass of the actual ore and the mass of the material to be measured are proportional coefficients of the mass of the steel ball.
2. The method of determining uniaxial compressive strength of a non-actual ore according to claim 1, wherein the mill is a laboratory
Figure FDA0003817704480000012
A discontinuous ball mill.
3. The method for determining uniaxial compressive strength of a non-actual ore according to claim 1, wherein the ore grinding conditions comprise a primary ball scheme and a filling rate.
4. The method for determining uniaxial compressive strength of non-actual ore according to claim 3, wherein the scheme of the primary balls is that the mass specific gravity of each diameter ball is
Figure FDA0003817704480000013
5. The method for determining uniaxial compressive strength of a non-actual ore according to claim 3, wherein the filling rate is 30%.
6. The method for determining uniaxial compressive strength of non-actual ores according to claim 1, wherein the ore grinding curve is a relationship curve of 80 μm screen residue of the product and ore grinding time.
7. The method for determining uniaxial compressive strength of a non-actual ore according to claim 1, wherein the grinding to the same fineness is grinding to 80 μm of a reject mass fraction of 10% or less.
8. The method for determining uniaxial compressive strength of a non-actual ore according to claim 1, wherein the K value is a ratio of sphericity of two materials, and the sphericity Q is defined according to a published formula Q = (d) L /d stk ) 2/3 Calculating where d is L Is measured by sedimentation methodEquivalent diameter of the particles tested, d stk The equivalent diameter of the particles tested by the laser diffraction method.
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