CN107377228B - Method for testing bubble particle adhesion collision behavior in coal slime flotation - Google Patents

Method for testing bubble particle adhesion collision behavior in coal slime flotation Download PDF

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CN107377228B
CN107377228B CN201710653544.1A CN201710653544A CN107377228B CN 107377228 B CN107377228 B CN 107377228B CN 201710653544 A CN201710653544 A CN 201710653544A CN 107377228 B CN107377228 B CN 107377228B
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flotation
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孙冬
董宪姝
樊玉萍
常明
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Taiyuan University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00—Specified materials treated by the flotation agents; specified applications
    • B03D2203/02—Ores
    • B03D2203/04—Non-sulfide ores
    • B03D2203/08—Coal ores, fly ash or soot
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    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N2015/0007—Investigating dispersion of gas
    • G01N2015/0011—Investigating dispersion of gas in liquids, e.g. bubbles

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Abstract

A testing method for bubble particle adhesion collision behavior in coal slime flotation is characterized in that a flotation speed test is carried out on a coal slime sample by selecting and adding the amount of kerosene serving as a collecting agent and the amount of sec-octanol serving as a foaming agent; and then calculating and processing test results to obtain the actual content of inorganic mineral substances and the content of clean coal in clean coal products at each stage of flotation, further calculating the effective adhesion probability of air bubbles and coal particles by using an air bubble-coal particle effective adhesion probability formula, fitting and analyzing the accumulated flotation recovery rate of the air bubbles and the coal particles by using Origin software by using a clean coal two-stage flotation kinetic equation, and finally calculating the effective collision rate coefficient of the air bubbles and the particles to measure the flotation effect so as to achieve the aim of providing guidance for further improving the yield and the grade of the clean coal in the actual flotation production process.

Description

Method for testing bubble particle adhesion collision behavior in coal slime flotation
Technical Field
The invention relates to a method for testing bubble particle adhesion collision in coal slime flotation, in particular to a method for measuring the effective bubble-coal particle adhesion probability and the effective collision rate coefficient in the coal slime flotation process.
Background
Flotation is a technical method for separating useful minerals from ores according to different physicochemical properties of the surfaces of mineral particles, is widely applied to separation of fine-grained and extremely fine-grained materials, is the most effective method for realizing fine-grained coal slime concentration at present, gradually increases the proportion of coal slime components in mined raw coal along with the continuous deep improvement of the level of coal mining machinery, seriously influences the normal running of coal production and the yield and quality of coal products, and increasingly meets the requirements of society on the quality of clean coal, and the flotation plays an important role in coal separation by virtue of the superiority of the flotation for treating the fine-grained coal slime.
The composition of coal, the properties of coal slurry, a chemical system, a flotation environment, a process flow and the like are all important factors influencing the flotation separation efficiency of coal slurry, which is the reason causing the flotation process to be complex, the flotation dynamics researches the change rule of the flotation process along with time under the control of various influencing factors, and the research on the flotation dynamics and a mathematical model thereof has important significance in order to deeply disclose the essence of the flotation process and scientifically manage the process.
Disclosure of Invention
The invention provides a method for testing the adhesion collision behavior of bubble particles in coal slurry flotation aiming at the existing coal slurry flotation process, and aims to control and reduce the entrance of inorganic minerals into clean coal by testing the adhesion collision behavior of the bubble particles in the coal slurry flotation process and further changing the flotation conditions.
The purpose of the invention is realized by the following technical scheme.
A method for testing the adhesion and collision behavior of bubble particles in coal slime flotation is carried out according to the following steps:
(1) selecting the coal slurry crushed and ground to a preset granularity, performing a flotation speed test, drying a flotation product and weighing the dried product, wherein the dosage of the added collecting agent kerosene is 1000 g/t and the dosage of a foaming agent sec-octanol is 100 g/t;
(2) calculating to obtain the actual content of inorganic mineral substances and the content of clean coal in clean coal products in each stage of flotation, and further calculating to obtain the effective adhesion probability of air bubbles and coal particles;
(3) and performing fitting analysis on the accumulated recovery rate of the bubble-coal particle flotation by adopting Origin software to obtain an optimal flotation kinetic equation, and finally calculating to obtain an effective collision rate coefficient of the bubble-coal particle flotation.
Based on the above technical solution, further, the formula for calculating the effective adhesion probability of the bubble-coal particles is as follows:
Figure 100002_DEST_PATH_IMAGE001
in the formulaP c Bubble-effective probability of adhesion of coal particles;m j flotation of the mass g of coal particles in the clean coal;m j0 and (4) flotation of the total mass g of the coal particles in the fed coal sample.
The flotation kinetic equation obtained by the Origin software through fitting analysis is as follows:
first-stage flotation kinetic equation of clean coal:
Figure 672974DEST_PATH_IMAGE002
（2）；
second-stage flotation kinetic equation of clean coal:
Figure 100002_DEST_PATH_IMAGE003
（3）。
the formula for calculating the effective collision velocity coefficient of the bubble-coal particles is as follows:
Figure 134043DEST_PATH_IMAGE004
（4）
Figure 100002_DEST_PATH_IMAGE005
（5）
in the formula:k p,c -bubble-coal particle effective collision rate coefficient;k c -clean coal flotation rate constant;k p,m -bubble-inorganic mineral particle effective collision rate coefficient;k m -inorganic mineral flotation rate constant.
Compared with the prior art, the implementation of the technical scheme has the advantages that the method for measuring the effective adhesion probability of the bubbles and the coal particles is provided for the coal slime flotation process, the effect of the flotation process is indexed, the flotation condition is changed, the inorganic minerals are reduced from entering clean coal, and the method has great guiding significance for further improving the yield and the grade of the clean coal.
Drawings
Figure 1 is a schematic of a prior art cell flotation process.
Figure 2 is a schematic of a prior art flotation rate test scheme.
FIG. 3 is a graph of flotation kinetic fitting results of anthracite-0.500 mm clean coal from the ancient mineral in the Jincheng of the present invention.
FIG. 4 is a table showing the flotation kinetic fitting results of anthracite-0.500 mm clean coal from the ancient mineral in the Jincheng of the present invention.
Detailed Description
The following further describes embodiments of the present invention.
The invention provides a method for testing the adhesion collision behavior of bubble particles in coal slime flotation, which aims at the existing coal slime flotation process, provides a basis for the coal slime flotation production process of a coal preparation plant, achieves the aim of controlling and reducing inorganic minerals entering clean coal by changing reasonable flotation conditions, and has great guiding significance for further improving the yield and the grade of the clean coal.
Firstly, carrying out a flotation speed test on collected on-site coal slime samples, calculating to obtain the actual content of inorganic mineral substances and the content of clean coal in clean coal products in each stage of flotation, further calculating to obtain the effective adhesion probability of air bubbles-coal particles, then carrying out fitting analysis on the accumulated recovery rate of air bubbles-coal particles by adopting Origin software to obtain an optimal flotation kinetic equation, and finally calculating to obtain the effective collision rate coefficient of air bubbles-coal particles.
In the coal slime flotation process of a coal preparation plant, the flotation conditions are regulated and controlled by using the change rule of the effective adhesion probability of the bubbles and the coal particles, and the inorganic minerals are reduced from entering clean coal, and the specific test method comprises the following steps:
a method for testing the adhesion and collision behavior of bubble particles in coal slime flotation is implemented by the following steps:
(1) crushing and grinding the collected flotation coal slime to a preset granularity, selecting and adding 1000 g/t of collecting agent kerosene and 100 g/t of foaming agent sec-octanol, and carrying out a flotation speed test on the coal slime, wherein the flow of the flotation speed test is shown in an attached figure 2.
(2) The floating speed test uses an XFD type single-groove floating machine with the volume of 1.5L, the rotating speed of impellers is uniformly set to 1800 r/min, and the aeration quantity is uniformly set to 0.15 m3/( m2Min), uniformly setting the mass concentration of flotation pulp to be 100 g/L, using 1000 g/t of collecting agent kerosene and 100 g/t of foaming agent octanol. Time to scrape bubbleSetting the materials to be 0.5, 1.0 and 2.0 min in sequence, scraping 5 times in total, and scraping 6 products in sequence: clean coal 1, clean coal 2, clean coal 3, clean coal 4, clean coal 5 and tail coal, filtering the products, drying and weighing.
(3) Calculating to obtain the actual content of inorganic mineral substances and the content of clean coal in the clean coal product in each flotation stage according to the formula (1) of the effective adhesion probability of the bubble-coal particles
Figure 32729DEST_PATH_IMAGE006
（1）
In the formula:P c bubble-coal particle effective adhesion probability,%;m j -flotation of the mass of coal particles in the clean coal, g;m j0 -total mass of coal particles in the flotation feed coal sample, g.
The effective adhesion probability of bubble-coal particles was further calculated.
(4) The experimental data of the bubble-coal particle flotation accumulated recovery rate in the coal slime flotation are according to the following kinetic equations (2) and (3):
first-stage flotation kinetic equation of clean coal:
Figure 743196DEST_PATH_IMAGE002
（2）；
second-stage flotation kinetic equation of clean coal:
Figure 18319DEST_PATH_IMAGE003
（3）。
(5) performing fitting analysis on the air bubbles by adopting Origin software, analyzing to obtain an optimal flotation kinetic equation, and finally calculating an effective collision rate coefficient of the air bubbles and the coal particles according to formulas (4) and (5);
Figure 130632DEST_PATH_IMAGE004
（4）
Figure 465798DEST_PATH_IMAGE005
（5）
in the formula:k p,c -bubble-coal particle effective collision rate coefficient;k c -clean coal flotation rate constant;k p,m -bubble-inorganic mineral particle effective collision rate coefficient;k m -inorganic mineral flotation rate constant.
Through the coal slime flotation process, the effective adhesion probability of bubbles and coal particles is measured, the effect of the flotation process is indexed, the flotation conditions are changed, inorganic minerals are reduced from entering clean coal, and the yield and the grade of the clean coal are further improved.
The following further describes embodiments of the present invention with reference to specific examples.
Aiming at the flotation effect of the anthracite coal slime of the ancient Jincheng mine, the flotation effect is indexed by adopting the method for measuring the effective adhesion probability of the bubbles and the coal particles.
Firstly, crushing and grinding the anthracite coal slime of the Shangcheng ancient mine to a preset granularity, selecting and adding 1000 g/t of collecting agent kerosene and 100 g/t of foaming agent octanol, and carrying out a flotation speed test on the anthracite coal slime. The flotation rate test flow is shown in figure 2. The flotation speed test procedure is as follows: the XFD type single-groove flotation machine with the volume of 1.5L is used, the rotating speed of the impeller is uniformly set to 1800 r/min, and the aeration quantity is uniformly set to 0.15 m3/( m2Min), uniformly setting the mass concentration of flotation pulp to be 100 g/L, using 1000 g/t of collecting agent kerosene and 100 g/t of foaming agent octanol. Scrape the bubble time and set for 0.5, 1.0, 2.0 min in proper order, scrape the bubble 5 times in total, scrape out 6 products in proper order: clean coal 1, clean coal 2, clean coal 3, clean coal 4, clean coal 5 and tail coal, filtering the products, drying and weighing.
And then calculating to obtain the actual content of the inorganic mineral substances and the content of the clean coal in the clean coal product in each stage of flotation according to the formula (1) of the effective adhesion probability of the bubbles and the coal particles.
The probability of effective bubble-coal particle adhesion was further calculated as shown in figure 3.
Table 1 effective bubble-coal particle adhesion probability during flotation of anthracite from the national mine:
flotation accumulation time (min) 0.51235;
bubble-clean coal effective adhesion probability (%) 671691.51;
then, according to kinetic equations (2) and (3), experimental data of bubble-coal particle flotation accumulated recovery rate during flotation of anthracite coal slime of the Jincheng ancient mine are obtained;
and performing fitting analysis on the coal particles by using Origin software to obtain an optimal flotation kinetic equation, and finally calculating an effective collision rate coefficient of the bubbles and the coal particles according to formulas (4) and (5) as shown in the attached table 3, wherein the optimal flotation kinetic equation is obtained by analyzing the coal particles, and the effective collision rate coefficient is shown in figure 2.

Claims (1)

1. A method for testing the adhesion and collision behavior of bubble particles in coal slime flotation is carried out according to the following steps:
(1) selecting the coal slime crushed and ground to the granularity of less than 0.5mm as the collecting agent with the use amount of kerosene of 1000 g/t and the use amount of foaming agent sec-octanol of 100 g/t, performing a flotation speed test, drying a flotation product and weighing the dried flotation product;
(2) calculating to obtain the actual content of inorganic mineral substances and the content of clean coal in clean coal products in each stage of flotation, and further calculating to obtain the effective adhesion probability of air bubbles and coal particles;
the formula for calculating the probability of effective bubble-coal particle adhesion is as follows:
Figure DEST_PATH_IMAGE001
in the formula, Pc-bubble-coal particle effective adhesion probability; mj-mass g of coal particles in the flotation clean coal; mj 0-total mass g of coal particles in the flotation feeding coal sample;
(3) and performing fitting analysis on the accumulated recovery rate of the bubble-coal particle flotation by adopting Origin software to obtain a flotation kinetic equation:
the flotation kinetic equation obtained by the Origin software through fitting analysis is as follows:
first-stage flotation kinetic equation of clean coal:
Figure 49934DEST_PATH_IMAGE002
second-stage flotation kinetic equation of clean coal:
Figure DEST_PATH_IMAGE003
finally, calculating the effective collision rate coefficient of the bubbles and the coal particles, and calculating the coefficient formula:
Figure DEST_PATH_IMAGE005
in the formula:k p,c -bubble-coal particle effective collision rate coefficient;k c -clean coal flotation rate constant.
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