CN113798065B - Composite inhibitor for reverse flotation of carbonate-containing iron ore and preparation method and application thereof - Google Patents
Composite inhibitor for reverse flotation of carbonate-containing iron ore and preparation method and application thereof Download PDFInfo
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- CN113798065B CN113798065B CN202110965386.XA CN202110965386A CN113798065B CN 113798065 B CN113798065 B CN 113798065B CN 202110965386 A CN202110965386 A CN 202110965386A CN 113798065 B CN113798065 B CN 113798065B
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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
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
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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
- 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
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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
- B03D1/02—Froth-flotation processes
- B03D1/025—Froth-flotation processes adapted for the flotation of fines
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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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/06—Depressants
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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
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a composite inhibitor for reverse flotation of carbonate-containing iron ore and a preparation method and application thereof, which are characterized by comprising the following process steps: stirring and mixing the carbonate-containing iron ore mixed magnetic concentrate, sequentially adding a composite inhibitor, an activating agent, a collecting agent and a foaming agent, stirring and mixing, feeding into a mechanical stirring type flotation machine, and performing reverse flotation roughing operation to obtain reverse flotation roughed concentrate and reverse flotation tailings; adding a certain amount of activating agent and collecting agent into the roughed concentrate, and then carrying out primary fine separation to obtain a reverse flotation final concentrate; and (4) carrying out scavenging twice on the rougher tailings to obtain reverse flotation final tailings. Compared with the prior art, the invention has the advantages that: by adding the composite inhibitor, the flotation effect is improved, the grade of the comprehensive iron ore concentrate is greater than 64%, the recovery rate is greater than 85%, and the recovery rate is increased by more than 3% under the condition of ensuring stable grade.
Description
Technical Field
The invention belongs to the technical field of mineral processing engineering, and particularly relates to a composite inhibitor for reverse flotation of carbonate-containing iron ore, and a preparation method and application thereof.
Background
The carbonate-containing iron ore is a refractory iron ore with complex mineral composition and distribution relationship. At present, the complex and difficult-to-separate ores are usually subjected to a combined process of weak magnetic separation, strong magnetic separation and reverse flotation, but because carbonate minerals such as iron dolomite, calcite and siderite contained in the ores are low in mohs hardness and easy to argillize in an ore grinding process, a large amount of fine mud minerals are generated and dispersed in ore pulp, and because the mineral particles have high specific surface area and surface energy, fine mud covers are generated in a flotation process, and the problems of surface conversion, flotation foam entrainment and the like are caused, so that the problems of poor selectivity of flotation reagents, low flotation recovery rate and large reagent dosage are caused, and the separation environment is seriously deteriorated. In addition, the inhibitor adopted in the past is mainly natural starch extracted from grain crops such as corn, cassava and the like as a raw material, the dosage of each ton of ore is about 1-2kg, the dosage of the medicament is high, a large amount of grain resources are consumed, and the national grain safety is not facilitated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a composite inhibitor for reverse flotation of carbonate-containing iron ores, a preparation method and application thereof, and aims to ensure that the easily argillized iron-containing carbonate minerals in ore pulp form hydrophilic mineral flocs through the agglomeration effect and the inhibition effect of the composite inhibitor on the micro-fine particle weak magnetic iron minerals, reduce the influence of the easily argillized minerals in the ores on reverse flotation operation, strengthen the inhibition effect on the easily argillized iron-containing carbonate minerals, reduce the water flow and foam entrainment of the fine particle iron minerals in the flotation process, improve the flotation recovery rate and improve the separation index.
The invention is realized by the following technical scheme:
the composite inhibitor for reverse flotation of the carbonate-containing iron ore is characterized by being prepared from corn starch, sodium alginate, polyacrylamide, sodium hydroxide, sodium chloride and water;
the composite inhibitor is prepared from corn starch and sodium alginate as main components, wherein the addition amount of polyacrylamide is 10% -20% of the total weight of the corn starch and the sodium alginate, the addition amount of sodium hydroxide is 5% -10% of the total weight of the corn starch and the sodium alginate, and the addition amount of sodium chloride is 3% -5% of the total weight of the corn starch and the sodium alginate.
Further, the weight ratio of the rice starch to the sodium alginate is 0.5-2.
The preparation method of the composite inhibitor for reverse flotation of the carbonate-containing iron ore is characterized by comprising the following steps of:
step 1, adding corn starch and sodium alginate into water to prepare emulsion with the weight percentage concentration of 40-60%;
step 2, adding the emulsion into a constant-temperature hydrothermal reaction kettle, then adding sodium hydroxide and sodium chloride, continuously stirring, controlling the reaction temperature to be 50-60 ℃, and reacting for 3-5 hours;
step 3, after the step 2 is finished, adding polyacrylamide into the constant-temperature hydrothermal reaction kettle, adjusting the reaction temperature to 80-90 ℃, and continuing the reaction for 3-5 hours to obtain a composite inhibitor mixed solution;
and 4, neutralizing the mixed solution of the composite inhibitor, washing, filtering and drying to obtain the composite inhibitor.
The application of the composite inhibitor for reverse flotation of carbonate-containing iron ore is characterized by comprising the following steps:
step 1, stirring and mixing the mixed magnetic concentrate in a stirring tank, and sequentially adding a pulp pH value regulator, a composite inhibitor, a gangue mineral activator, a collecting agent and a foaming agent;
and 2, after fully mixing, feeding the ore pulp into a flotation machine for reverse flotation operation, and sequentially performing primary reverse flotation roughing, primary fine selection and twice scavenging to finally obtain a qualified iron concentrate product.
Further, in the step 1, the pulp pH value regulator is sodium hydroxide, and the addition amount of the sodium hydroxide is to adjust the pulp pH value range to 11.0-12.0; the addition amount of the composite inhibitor is 500-800g per ton of the mixed magnetic concentrate, namely 500-800g/t; the gangue mineral activator is lime or calcium chloride, or a mixture of lime or calcium chloride, and the addition amount is 400-800g/t; the collecting agent is sodium oleate, and the addition amount of the sodium oleate is 300-500g/t; the foaming agent is second oil, and the addition amount of the second oil is 30-50 g/t.
Further, in step 2, the parameters of the first reverse flotation roughing are as follows: the roughing time is 4-6min; the first selection parameters are as follows: adding gangue mineral activator at 400-600g/t, collecting agent at 200-400g/t, pH value of ore pulp at 11.0-12.0, and concentrating for 3-4min; the two-time scavenging parameters are as follows: the pH value of the ore pulp ranges from 11.0 to 12.0, and the scavenging time is 3 to 4min.
Mechanism of action of composite inhibitors
Siderite and hematite and limonite contained in the carbonate-containing iron ore are easy to argillization, small in granularity, high in surface energy and easy to adsorb on the surfaces of hematite and quartz particles. Adding a composite inhibitor to enable the composite inhibitor to be adsorbed on the particle surface, forming the siderite particles into floccules by utilizing the agglomeration of the composite inhibitor, and reducing the probability that the argillized siderite particles cover the hematite particles; meanwhile, the composite inhibitor can enhance the hydrophilicity of the particle surface, increase the hydration repulsion force among the particles and improve the flotation environment.
Compared with the prior art, the invention has the advantages that:
(1) By adding the composite inhibitor, the hydrophilicity of the particle surface can be enhanced, the probability that the argillized siderite particles cover the hematite particles is reduced by utilizing the agglomeration effect of the composite inhibitor, the carbonate-containing iron ore is effectively treated, the flotation effect is improved, and the iron ore concentrate with the grade of more than 64 percent and the recovery rate of more than 85 percent is obtained; under the condition of ensuring stable grade, the recovery rate can be improved by more than 3 percent;
(2) Compared with the conventional inhibitor, the inhibitor can reduce the dosage by more than 30 percent and reduce the consumption of grain resources;
(3) Has practical significance for the high-efficiency utilization of the carbonate-containing complex refractory iron ore in China.
Drawings
FIG. 1 is a process flow diagram of the practice of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
The reagents and materials described in the following examples are commercially available, unless otherwise specified.
The stirrer used in the embodiment of the invention is XJT-II type.
The comparative example of the reverse flotation process for treating the carbonate-containing iron ore mixed magnetic concentrate by using the conventional inhibitor causticizing corn starch is as follows:
comparative example
Stirring and size mixing the carbonate-containing iron ore mixed magnetic concentrate, sequentially adding conventional inhibitor causticized corn starch, activating agent, collecting agent and foaming agent to stir and size mixing, feeding into a mechanical stirring type flotation machine, and performing reverse flotation roughing operation to obtain reverse flotation roughed concentrate and reverse flotation tailings; adding a certain amount of activating agent and collecting agent into the rough flotation concentrate, and then carrying out primary concentration to obtain a final reverse flotation concentrate; and carrying out scavenging on the rougher tailings twice to obtain the reverse flotation final tailings.
The preparation example of the composite inhibitor of the invention is as follows:
example 1
(1) Mixing corn starch and sodium alginate according to a mass ratio of 0.5:1, then adding the emulsion into a constant-temperature hydrothermal reaction kettle, continuously stirring, then adding sodium hydroxide and sodium chloride, wherein the total mass of the sodium hydroxide and the sodium alginate is 8% of the total mass of the corn starch and the sodium alginate, controlling the reaction temperature at 60 ℃, and reacting for 5 hours;
(2) Adding polyacrylamide accounting for 10 percent of the total mass of the corn starch and the sodium alginate after reacting for 5 hours, adjusting the reaction temperature to 85 ℃, continuing to react for 4 hours to obtain a composite inhibitor, neutralizing the composite inhibitor, washing, filtering, drying and preparing into an aqueous solution with the concentration of 8 percent for later use.
Example 2
(1) Mixing corn starch and sodium alginate according to a mass ratio of 1:1, adding the emulsion into a constant-temperature hydrothermal reaction kettle, continuously stirring, adding sodium hydroxide and sodium chloride, wherein the total mass of the sodium hydroxide and the sodium alginate is 5% of the total mass of the corn starch and the sodium alginate, controlling the reaction temperature at 50 ℃, and reacting for 3 hours;
(2) Adding polyacrylamide accounting for 10 percent of the total mass of the corn starch and the sodium alginate after reacting for 3 hours, adjusting the reaction temperature to 80 ℃, continuing to react for 3 hours to obtain a composite inhibitor, neutralizing the composite inhibitor, washing, filtering, drying and preparing into aqueous solution with the concentration of 5 percent for later use.
The application examples of the composite inhibitor in the invention are as follows:
example 1
The Liaoning area mixed magnetic concentrate containing carbonate and iron ore is taken as a flotation raw material, the result of particle size analysis is that 87.85 percent is occupied by-0.038 mm, the TFe grade in an ore sample is 48.64 percent, the SiO2 content is 41.32 percent, and the iron carbonate mineral content is 7.15 percent.
The specific implementation steps are as follows:
(1) Stirring and size mixing the obtained carbonate-containing iron ore mixed magnetic concentrate, size mixing to obtain size with the mass concentration of 30%, sequentially adding an ore pulp pH value regulator sodium hydroxide to adjust the pH value of the ore pulp to 11.50, sequentially adding a composite inhibitor, wherein the dosage of the medicament is 600g/t, the dosage of gangue mineral activator lime is 500g/t, the dosage of a collecting agent sodium oleate is 400g/t, the dosage of foaming agent II oil is 40g/t, carrying out a reverse flotation roughing test after size mixing for 3min, and carrying out the roughing for 5min;
(2) Carrying out primary concentration on the roughed concentrate, wherein the dosage of gangue mineral activator lime and collecting agent sodium oleate is 400g/t and 200g/t respectively during concentration, controlling the pH value of ore pulp to be 11.50, and carrying out concentration for 3min to obtain the final reverse flotation concentrate;
(3) And (4) carrying out scavenging on the rougher tailings twice, controlling the pH value of the ore pulp to be 11.50, and carrying out scavenging for 3min to obtain the reverse flotation final tailings.
The iron grade of the concentrate obtained by the method is 66.5 percent, the iron recovery rate is 85.20 percent, and the result of the primary calculation of technical and economic indexes shows that compared with the original conventional reverse flotation process of the high-carbonate iron ore mixed magnetic concentrate, the iron grade of the concentrate obtained by the method is increased by 1.20 percent, and the iron recovery rate is increased by 3.86 percent.
Example 2
The mineral concentrate containing carbonate and iron ore mixed magnetism in Liaoning area is taken as a flotation raw material, the result of particle size analysis is that-0.038 mm accounts for 85.62%, the TFe grade in an ore sample is 45.64%, the SiO2 content is 40.32%, and the iron carbonate mineral content is 6.25%.
The specific implementation steps are as follows:
(1) Stirring and size mixing the obtained carbonate-containing iron ore mixed magnetic concentrate, size mixing to obtain size with the mass concentration of 35%, sequentially adding an ore pulp pH value regulator sodium hydroxide to adjust the pH value of the ore pulp to 11.0, sequentially adding a composite inhibitor, wherein the dosage of the medicament is 500g/t, the dosage of gangue mineral activator lime is 400g/t, the dosage of collecting agent sodium oleate is 300g/t, the dosage of foaming agent II oil is 30g/t, carrying out a reverse flotation roughing test after size mixing for 3min, and carrying out the roughing for 5min;
(2) Carrying out primary concentration on the roughed concentrate, wherein the dosage of gangue mineral activator lime and collecting agent sodium oleate is 400g/t and 200g/t respectively during concentration, controlling the pH value of ore pulp to be 11.50, and carrying out concentration for 3min to obtain the final reverse flotation concentrate;
(3) And (4) carrying out scavenging on the rougher tailings twice, controlling the pH value of the ore pulp to be 11.50, and carrying out scavenging for 3min to obtain the reverse flotation final tailings.
The iron grade of the concentrate finally obtained by the method is 65.5 percent, the iron recovery rate is 90.5 percent, and the result of the preliminary calculation of technical and economic indexes shows that compared with the conventional reverse flotation process of the high-carbonate iron ore mixed magnetic concentrate, the iron grade of the concentrate floated by the method is increased by 1.02 percent, and the iron recovery rate is increased by 3.65 percent.
Example 3
The mineral magnetic concentrate containing carbonate and iron ore in Liaoning area is used as the flotation material, the result of the particle size analysis is that 89.62% is contained in-0.038 mm, the TFe grade in the ore sample is 43.02%, the SiO2 content is 50.68%, and the iron carbonate mineral content is 6.86%.
The specific implementation steps are as follows:
(1) Stirring and size mixing the obtained carbonate-containing iron ore mixed magnetic concentrate, size mixing to obtain size with the mass concentration of 35%, sequentially adding an ore pulp pH value regulator sodium hydroxide to adjust the pH value of the ore pulp to 11.0, sequentially adding a composite inhibitor, wherein the dosage of the medicament is 600g/t, the dosage of gangue mineral activator lime is 600g/t, the dosage of a collecting agent sodium oleate is 500g/t, the dosage of foaming agent II oil is 30g/t, carrying out a reverse flotation roughing test after size mixing for 3min, and carrying out the roughing for 5min;
(2) Carrying out primary concentration on the rough concentrate, wherein the dosage of gangue mineral activator lime and collecting agent sodium oleate is 400g/t and 200g/t respectively during concentration, controlling the pH value of ore pulp to be 11.50, and carrying out concentration for 3min to obtain the final reverse flotation concentrate;
(3) And (4) carrying out scavenging on the rougher tailings twice, controlling the pH value of the ore pulp to be 11.50, and carrying out scavenging for 3min to obtain the reverse flotation final tailings.
The iron grade of the concentrate finally obtained by the method is 65.80 percent, the iron recovery rate is 87.54 percent, and the result of the primary calculation of technical and economic indexes shows that compared with the original conventional reverse flotation process of the high-carbonate iron ore mixed magnetic concentrate, the iron grade of the concentrate obtained by the method is increased by 1.13 percent, and the iron recovery rate is increased by 3.34 percent.
The gangue mineral activator may be lime or calcium chloride or a mixture of lime and calcium chloride.
Claims (2)
1. The composite inhibitor for reverse flotation of the carbonate-containing iron ore is characterized by being prepared from corn starch, sodium alginate, polyacrylamide, sodium hydroxide, sodium chloride and water;
wherein, corn starch and sodium alginate are used as main components of the composite inhibitor, the addition amount of the polyacrylamide is 10-20% of the total weight of the corn starch and the sodium alginate, the addition amount of the sodium hydroxide is 5-10% of the total weight of the corn starch and the sodium alginate, and the addition amount of the sodium chloride is 3-5% of the total weight of the corn starch and the sodium alginate; the weight ratio of the corn starch to the sodium alginate is 0.5-2.
2. A method for preparing the composite depressant for reverse flotation of carbonate-containing iron ores according to claim 1, comprising the steps of:
step 1, adding corn starch and sodium alginate into water to prepare emulsion with the weight percentage concentration of 40-60%;
step 2, adding the emulsion into a constant-temperature hydrothermal reaction kettle, then adding sodium hydroxide and sodium chloride, continuously stirring, controlling the reaction temperature to be 50-60 ℃, and reacting for 3-5 hours;
step 3, after the step 2 is finished, adding polyacrylamide into the constant-temperature hydrothermal reaction kettle, adjusting the reaction temperature to 80-90 ℃, and continuing the reaction for 3-5 hours to obtain a composite inhibitor mixed solution;
and 4, neutralizing the mixed solution of the composite inhibitor, washing, filtering and drying to obtain the composite inhibitor.
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| US4360425A (en) * | 1981-09-14 | 1982-11-23 | American Cyanamid Company | Low molecular weight copolymers and terpolymers as depressants in mineral ore flotation |
| US4877517A (en) * | 1988-05-02 | 1989-10-31 | Falconbridge Limited | Depressant for flotation separation of polymetallic sulphidic ores |
| CN102284352B (en) * | 2011-08-08 | 2013-05-08 | 中南大学 | Efficient ore dressing and impurity removal process for potassium and sodium feldspar ores which are complex and difficult to process and combined medicament thereof |
| CN102688806A (en) * | 2012-06-06 | 2012-09-26 | 鞍钢集团矿业公司 | Dispersed flotation separation method for carbonate-containing iron ore |
| CN104998759A (en) * | 2015-07-29 | 2015-10-28 | 昆明理工大学 | Combined reagent for reverse flotation of microgranular iron ore magnetic concentrate and application method thereof |
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