AU2021101524A4 - Electrochemical Test Method of Galvanic Action in Sulfide Ore Flotation - Google Patents
Electrochemical Test Method of Galvanic Action in Sulfide Ore Flotation Download PDFInfo
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- AU2021101524A4 AU2021101524A4 AU2021101524A AU2021101524A AU2021101524A4 AU 2021101524 A4 AU2021101524 A4 AU 2021101524A4 AU 2021101524 A AU2021101524 A AU 2021101524A AU 2021101524 A AU2021101524 A AU 2021101524A AU 2021101524 A4 AU2021101524 A4 AU 2021101524A4
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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
- B03D1/14—Flotation machines
- B03D1/1437—Flotation machines using electroflotation
-
- 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
- B03D1/02—Froth-flotation processes
- B03D1/028—Control and monitoring of flotation processes; computer models therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/413—Concentration cells using liquid electrolytes measuring currents or voltages in voltaic cells
-
- 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
- B03D2203/025—Precious metal ores
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- Electrolytic Production Of Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to an electrochemical test method of galvanic action in
sulfide ore flotation. The method comprises the steps of: (1) cutting a high purity ore
sample to obtain ore block electrodes, cutting an ore or ore grinding medium uniformly
into cylinders with equal diameter and thickness, and ensuring that all the block
electrodes have a same surface area; and (2) connecting the electrodes and using an
electrochemical workstation for testing, and using different first ore block electrodes
and second ore block electrodes for testing so as to acquire the electrochemical test
results of the tested ore not subjected to galvanic action and subjected to galvanic
action. The method provided by the invention can directly reflect different effects of
galvanic action on anode and cathode ore surface oxidation and xanthate adsorption.
2/2
10
41
12 2
0
,2
-j p p - -- -A - - - - pj
A
-1.0 4.6 .0.6 .0.A .0.2 0.0 0.2 0.4 0.6 06 1.0
Potdi*W
Figure 3
Description
2/2
10
41
12 2
,2 A -j pp - -- -A- - - - pj -1.0 4.6 .0.6 .0.A .0.2 0.0 0.2 0.4 0.6 06 1.0 Potdi*W
Figure 3
Electrochemical Test Method of Galvanic Action in Sulfide Ore Flotation
The invention relates to an electrochemical test method of galvanic action
in sulfide ore flotation, which is suitable for testing the effect of galvanic action
between sulfide ores on the electrochemical properties of the cathode or
anode ores as well as reagent absorption ability.
The electrochemical test method is one of the main methods to study the
effect of galvanic action between sulfide ores. However, the traditional
electrochemical test method for galvanic action can only obtain test results of
mixed ores by a mixed ore electrode, and cannot directly obtain independent
effect on anode or cathode ores by the galvanic action (Feng Qiming, Chen
Jianhua, Sulfide Ore Flotation Electrochemistry [specialized publication B],
Central South University Press, Changsha, 2012, Pages 11-18). Sulfide ores
and ore grinding media used for flotation have different electrostatic potentials,
and are mutually in contact to generate electronic transfer, resulting in
redistribution of surface charge to affect oxidization and flotation recovery of
the ores. In general, electrons are transferred to the cathode ores from the
anode ores during galvanic action, and the anode ores are subjected to
galvanic corrosion and the cathode ores are subjected to electrochemical
protection. Moreover, the ores with strong electrochemical activity are possibly
strengthened in flotability in galvanic action, and the ores with poor
electrochemical activity are possibly inhibited in galvanic action (Feng Qiming,
Galvanic Corrosion and Effect on Flotation in Sulfide Ore Pulp System,
Foreign Metal Ore Beneficiation (Journal), 1999, 9: 2-4). Therefore, it is very
important to study the effect of galvanic action on the surface properties and
adsorption capacity of both cathode ores and anode ores to understand the
influences of galvanic action on the oxidation and flotation of sulfide ores.
The objective of the invention is to provide an electrochemical test method
of galvanic action in sulfide ore flotation, which can visually study the different
effects of galvanic action on the surface oxidation and xanthate adsorption of
anode and cathode ores.
To achieve the objective, the invention provides the following technical
scheme: the electrochemical test method of galvanic action in sulfide ore
flotation includes the following steps:
(1) Preparing ore block electrodes
Cutting the high purity ore sample to obtain ore block electrodes, cutting
the ore or ore grinding medium evenly into cylinders of equal diameter and
thickness to ensure that all the block electrodes have the same surface area.
(2) Preparing before a test
Firstly, using aluminum oxide powder to grind the ore block electrodes,
and making the ore block electrodes expose fresh and clean ore surfaces;
connecting the grinded first ore block electrodes and the second ore block
electrodes by copper wires, soaking for 30 minutes in solution to be tested,
and measuring the soaked electrodes.
(3) Using an electrochemical workstation to test
During the test, connecting the first ore block electrodes to the second ore
block electrodes together by the copper wires, wherein the first ore block
electrodes are taken as tested electrodes to connect to platinum electrodes
and calomel electrodes and soak into the solution, while the second ore block
electrodes are taken as electrodes for generating galvanic action so as to
connect to the first ore block electrodes by copper wires and put outside the
solution; during the test, the same ores are used to carry out the test of the first
ore block electrodes and the second ore block electrodes; and the test results
are taken as experimental results of the mineral without galvanic action to
compare with the test results of the mineral with galvanic action, in order to
eliminate the possibly additional influence on the test results caused by
connecting the first ore block electrode with the second ore block electrode.
The invention has the outstanding advantages of being capable of directly
reflecting different influences, on surface oxidation and xanthate adsorption of
anode and cathode ores, by the galvanic action from the test results.
Fig. 1 is a schematic diagram showing an electrochemical test method of
galvanic action in sulfide ore flotation. (a) preparation before the test; and (b)
during the test. Marks in the figure are as follows: 1. working electrode; 2.
calomel electrode; 3. platinum electrode; 4. first ore block electrode; 5. second
ore block electrode; 6. copper wire; 7. resin; 8. silver brazing; 9. ore block; and
10. solution.
Fig. 2 is a schematic diagram showing an open circuit electric potential of
pyrite, galena and chalcopyrite with or without galvanic action when the pH value is 9.18. Marks in the figure are as follows: 1. pyrite (pyrite); 2. pyrite
(galena); 3. galena (pyrite); 4. galena (galena).
Fig. 3 is a schematic diagram showing a cyclic voltammetry curve of
galena block electrodes and pyrite with or without galvanic action when the pH
value is 9.18, the concentration of butyl xanthate is 0.01 mol/L. Marks in the
figure are as follows: 1. galena (galena); 2. galena (pyrite).
The technical solution of the invention is further illustrated by the following
embodiments.
Embodiment 1
The embodiment was an application example of the electrochemical test
method of galvanic action in sulfide ore flotation, which tested open circuit
electric potential of pyrite, galena and chalcopyrite with or without galvanic
action when the pH value is 9.18, including the following steps:
1) Properties of the tested ore block electrodes were as follows: Galena
and pyrite for experimental use were sourced from Wuzhou, Guangxi,
chalcopyrite was sourced from Guilin, Guangxi, which were high-purity
minerals selected from the ores. The chemical composition of the mineral
sample was as shown in Table 1. Both galena and pyrite pure minerals were
cut into cylinders having a diameter of 0.55 cm and a thickness of 0.3 cm for
the preparation of galena and pyrite block electrodes to ensure that all of the
ore block electrodes had the same ore surface area of 0.24cm 2 .
Chemical composition of the ore sample was as shown in table 1.
2) operation steps:
(1) Chalcopyrite, galena and pyrite ore block electrodes were
manufactured, where the ore block electrodes were prepared from minerals,
copper wires, resin and silver welding substances as shown in Fig. 1; and a
solution with a pH value being 9.18 was prepared.
(2) Pyrite and galena electrodes were connected together through the
copper wires, where pyrite electrodes were taken as tested electrodes so as to
connect to platinum electrodes and calomel electrodes and soak into a
solution, while galena electrodes were taken as electrodes for generating
galvanic action so as to connect to the pyrite electrodes through copper wires
and put outside the solution; and an electrochemical workstation was used to
measure open circuit electric potential to obtain test results of the open circuit
electric potential of pyrite when galena and pyrite generated galvanic action.
(3) Two pieces of pyrite were connected together through the copper
wires, where one pyrite electrode was taken as the tested electrode so as to
connect to the platinum electrode and calomel electrode and soak into a
solution, while the other pyrite electrode was taken as an electrode for
generating galvanic action so as to connect to the pyrite electrode through a
copper wire and put outside the solution; an electrochemical workstation was
used to measure the test result of the open circuit electric potential when pyrite
did not generate galvanic action. Such results were then compared with the
open circuit electric potential test results of pyrite under the galvanic action of
galena, in order to eliminate possibly additional influences on the test results
caused by connecting the first ore block electrode 4 (used for test) and the
second ore block electrode 5 (used for generating galvanic action) .
(4) The process of (2), (3) and (4) were repeated, and the open circuit
electric potential of pyrite and galena with or without generating galvanic action
when the pH value was 9.18 as shown in Fig. 2. As shown in Fig. 2, when the
pH value was 9.18, the open circuit electric potential of pyrite was higher than
that of galena regardless of the generation of the galvanic action. Moreover,
after galvanic action was generated, electrode electric potentials of ore
surfaces generated remarkable change. For pyrite surface, the open circuit
electric potential was remarkably reduced after generating galvanic action
between pyrite and galena ; and for galena, the open circuit electric potential
was slightly increased after generating galvanic action between galena and
pyrite.
Embodiment 2
This embodiment was another application example of an electrochemical
test method of galvanic action in sulfide ore flotation described in the invention,
when the pH value was 9.18 and the concentration of butyl xanthate was 0.01
mol/L, a cyclic voltammetry curve was obtained when galvanic action did or did
not occur between galena block electrodes and pyrite.
1) Ore block electrode properties were tested: galena and pyrite used for
experiment were sourced from Wuzhou, Guangxi, and high-purity minerals
were selected from the ores for preparation. The chemical composition of the
ore sample was as shown in Table 1. Both galena and pyrite pure ores were
cut into cylinders having a diameter of 0.55 cm and a thickness of 0.3 cm for
the preparation of galena and pyrite block electrodes to ensure that all of the
ore block electrodes had the same ore surface area of 0.24cm 2 .
2) Operation steps:
(1) Galena and pyrite ore block electrodes were manufactured, where the
ore block electrodes were prepared from minerals, copper wires, resin and
silver welding substances as shown in Fig. 1; and a solution with a pH value
being 9.18 and a concentration of butyl xanthate being 0.01 mol/L was
prepared.
(2) Pyrite and galena electrodes were connected together through copper
wires, where galena electrodes were taken as tested electrodes so as to
connect to platinum electrodes and calomel electrodes and soak into a
solution, pyrite electrodes were taken as electrodes for generating galvanic
action so as to connect to the pyrite electrodes through copper wires and put
outside the solution; and an electrochemical workstation was used to measure
a cyclic voltammetry curve of galena when galena block electrodes and pyrite
generated galvanic action at the pH value of 9.18 and the concentration of
butyl xanthate of 0.01 mol/L, namely curve 2 in Fig. 3.
(3) Two pieces of galena were connected together through the copper
wires, where one galena electrode was taken as a tested electrode so as to
connect to platinum electrode and calomel electrode and soak into a solution,
and the other galena electrode was taken as an electrode for generating
galvanic action so as to connect to the galena electrode through a copper wire
and put outside the solution; an electrochemical workstation was used to
measure a cyclic voltammetry curve, namely a curve 1 in a Fig. 3, of galena to
obtain test results of galena while galena independently existed if the pH value
was 9.18 and the concentration of butyl xanthate was 0.01 mol/L.
As show in Fig. 3, intensities of the two oxidation peaks on the cyclic
voltammetry curve of galena were significantly enhanced after galena and pyrite generated galvanic action, and the initial positions of the two oxidation peaks generated negative shift while the galena and pyrite did not generate galvanic action, indicating that the galvanic action with pyrite promoted adsorption, on the surfaces of galena, of xanthate.
Claims (1)
1. An electrochemical test method of galvanic action in sulfide ore
flotation, comprising the following steps:
(1) preparing ore block electrodes:
cutting the high purity ore sample to obtain ore block electrodes, cutting
the ore or ore grinding medium uniformly into cylinders with equal
diameter and thickness, and ensuring that all the block electrodes have
the same surface area;
(2) preparing before a test:
firstly, using aluminum oxide powder to grind the ore block electrodes, and
making the ore block electrodes expose fresh and clean ore surfaces;
connecting the grinded first ore block electrodes and the second ore block
electrodes by copper wires, soaking for 30 minutes in a solution to be
tested, and measuring the soaked electrodes;
(3) using an electrochemical workstation to test:
During the test, connecting the first ore block electrodes to the second ore
block electrodes together by the copper wires, wherein the first ore block
electrodes are taken as tested electrodes to connect to platinum
electrodes and calomel electrodes and soak into the solution, and the
second ore block electrodes are taken as electrodes for generating
galvanic action so as to connect to the first ore block electrodes by copper
wires and put outside the solution; during the test, the same ores are used
to carry out the test of the first ore block electrodes and the second ore
block electrodes; and the test results are taken as experimental results of
the mineral without galvanic action to compare with the test results of the mineral with galvanic action, in order to eliminate the possibly additional influence on the test results caused by connecting the first ore block electrode with the second ore block electrode.
FIGURES OF THE SPECIFICATION
1/2 2021101524
Figure 1
Figure 2
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021101524A AU2021101524A4 (en) | 2021-03-25 | 2021-03-25 | Electrochemical Test Method of Galvanic Action in Sulfide Ore Flotation |
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| AU2021101524A AU2021101524A4 (en) | 2021-03-25 | 2021-03-25 | Electrochemical Test Method of Galvanic Action in Sulfide Ore Flotation |
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| AU2021101524A4 true AU2021101524A4 (en) | 2021-05-20 |
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2021
- 2021-03-25 AU AU2021101524A patent/AU2021101524A4/en not_active Ceased
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