CN112588430A - Short-flow efficient separation process for carbonate-containing iron ore - Google Patents
Short-flow efficient separation process for carbonate-containing iron ore Download PDFInfo
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- CN112588430A CN112588430A CN202011421813.XA CN202011421813A CN112588430A CN 112588430 A CN112588430 A CN 112588430A CN 202011421813 A CN202011421813 A CN 202011421813A CN 112588430 A CN112588430 A CN 112588430A
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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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
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
- B02C17/163—Stirring means
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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
- B02C17/18—Details
- B02C17/20—Disintegrating members
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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
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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
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Abstract
The invention relates to a short-flow efficient separation process of carbonate-containing iron ore, which comprises the following steps of carrying out two-stage continuous closed circuit grinding operation on raw ore with the granularity of-12 mm to obtain a two-stage graded overflow product with the content of-200 meshes of 77-83%, and is characterized in that the step of processing the two-stage graded overflow product comprises the following steps: 1) carrying out weak magnetic-strong magnetic separation, regrinding the mixed magnetic concentrate, and discarding the tail of the strong magnetic tailings; 2) finely grinding by a stirring mill to obtain a reground product with the content of-0.038 mm accounting for 90-95%; 3) and (3) carrying out primary coarse-fine three-sweep anion reverse flotation to obtain the final concentrate with the iron grade of more than 65.5 percent and the recovery rate of more than 78 percent. The invention has the advantages that: 1) simplifying the existing flow and removing the reselection flow; 2) the ceramic balls are used as grinding media, so that the particle size distribution of the ground product is improved, and the subsequent sorting is facilitated; 3) the grading index is improved, the iron grade of the final concentrate is more than 65.5 percent, and the recovery is more than 78 percent.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a short-flow efficient separation process for carbonate-containing iron ores.
Background
The iron ore resources in China are characterized by low grade, fine and impurity, namely low grade, fine embedded granularity and complex mineral composition, so that more than 97 percent of iron ores can be ironed in a blast furnace only by a complex ore dressing process. Wherein, the carbonate-containing complex iron ore has the characteristics of low raw ore grade, complex composition, complex structure, fine embedded granularity, poor ore grinding characteristics and the like, and is about 200 hundred million tons. Taking carbonate-containing iron ore selected in a mineral separation workshop of a Dongshan sintering plant as an example, the current mineral separation process flow is shown in figure 1 and is a two-section continuous grinding middling regrinding gravity separation-magnetic separation-anion reverse flotation combined mineral separation process after multiple process flow reconstruction. The main problems of the process are that the process is complicated and long, the balance is difficult to control and stable, and the final concentrate grade and recovery index have large fluctuation. The specific problems are as follows: 1) the efficiency of coarse-fine classification and regrinding classification is relatively low, and the fineness of regrinding ground ore products is insufficient, so that the sorting effect of flotation is poor, the grade of flotation tailings is high, and the recovery rate index is influenced; 2) magnetic operation in reselection-sweeping has more problems, and the quality of reselected concentrate is often low; the grade of the magnetic tailings in the process of sweeping is higher, and the recovery rate index is influenced. Research shows that the reason for the problems in production is that the iron ores are easy to generate a argillization phenomenon in the ore grinding process, namely, the amount of products in an extremely fine fraction is larger than that of normal iron ores, and the amount of products in an extremely coarse fraction is larger than that of normal iron ores; that is, compared with the particle size distribution of normal iron ore grinding products, the particle size distribution of the iron ore grinding products has more products at the two ends of a coarse fraction and a fine fraction and less products at a middle fraction; the particle size distribution of the iron ore grinding product has the problems that large particles are difficult to dissociate and dissociate from monomers and the argillization degree of small particles is high.
Disclosure of Invention
Aiming at the problems and the defects in the prior art and combining with the latest research results in the field of ore grinding, the invention aims to provide a short-flow high-efficiency separation process for carbonate-containing iron ore, which simplifies the flow of the existing production process, saves energy, reduces consumption, reduces production cost and improves the technical indexes of ore dressing.
The invention is realized by the following technical scheme:
the invention discloses a short-flow efficient separation process of carbonate-containing iron ore, which comprises the following steps of carrying out two-stage continuous closed circuit grinding operation on raw ore with the granularity of-12 mm to obtain a two-stage graded overflow product with the content of-200 meshes of 77-83%, and is characterized in that the step of processing the two-stage graded overflow product comprises the following steps:
step 1, weak magnetic-strong magnetic sorting
Feeding the secondary grading overflow product into a low-intensity magnetic separator for separation to obtain low-intensity magnetic concentrate and low-intensity magnetic tailings, feeding the low-intensity magnetic tailings into a high-intensity magnetic separator for separation to obtain high-intensity magnetic concentrate and high-intensity magnetic tailings, combining the low-intensity magnetic concentrate and the high-intensity magnetic concentrate into mixed magnetic concentrate, and discarding the tail of the high-intensity magnetic tailings;
step 2, finely grinding the ore by a regrind mill
Feeding the mixed magnetic concentrate into a regrind mill for grinding to obtain a regrind product with the content of-0.038 mm accounting for 90% -95%;
Feeding the reground product into anion reverse flotation operation, and performing primary coarse-fine three-scavenging separation to obtain flotation concentrate and flotation tailings;
the flotation concentrate is the final concentrate, the iron grade of the final concentrate is more than 65.5 percent, and the recovery rate is more than 78 percent; and combining the flotation tailings and the strong magnetic tailings into final tailings.
The raw ore is carbonate-containing iron ore, the total iron grade is 31-36%, the siderite grade accounts for 1.5-2.5%, and the main gangue mineral is quartz.
The regrinding machine is a stirring mill and adopts grinding medium ceramic balls.
In step 3, the flotation reagents and the amounts added are as follows: adjusting the pH value of the ore pulp to 11.0-11.5 by using NaOH as a pH regulator; the dosage of the iron mineral inhibitor starch is 800-1000 g/t; the dosage of a quartz activating agent CaO is 900 g/t-1100 g/t; and the dosage of the anion collecting agent KS-III is 500 g/t-650 g/t.
The anion collecting agent KS-III is obtained from Dongshan sintering plant and is a multifunctional compound anion collecting agent.
Compared with the prior art, the invention has the advantages that:
1) the regrinding operation adopts a stirring mill to grind fine ores, and the grinding medium adopts ceramic balls, so that the particle size distribution of the ground ore product is improved, the dissociation degree of iron mineral monomers is improved, and the over-grinding phenomenon is effectively reduced;
2) the gravity separation process is omitted in the existing production process, the separation process is shortened, the control is easier, and meanwhile compared with the existing process, the concentrate grade of the process is improved by 0.5-1% under the condition of stable recovery rate.
Drawings
FIG. 1 is a flow chart of the current production process.
FIG. 2 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example 1
The raw ore is hematite containing carbonate (TFe =32.14%, siderite 1.50%, SiO)2= 52.89%), taking a secondary grading overflow product of two-section continuous closed circuit ore grinding operation of a certain ore dressing plant in Anshan Liaoning, taking back to a laboratory, drying, mixing uniformly, taking the secondary grading overflow product as an experimental sample, and measuring that the granularity of the secondary grading overflow product is-200 meshes and accounts for 79%.
The specification and model of the low-intensity magnetic separator adopted in the experiment are as follows: RK/CRS 400X 300 model roller magnetic separator, Wuhanloke manufacturing Co., Ltd;
the specification and model of the strong magnetic machine are as follows: SSS-1-855 model wet double-frequency double-vertical-ring high-gradient magnetic separator, Guangzhou non-ferrous metals research institute;
the specification and model of the stirring mill are as follows: NEUMM-3 model stirring mill, university of northeast.
As shown in fig. 2, after preparing the second-stage graded overflow product into ore pulp with the concentration of 30%, feeding the ore pulp into a low-intensity magnetic separator for separation (103.5 KA/m) to obtain low-intensity magnetic concentrate and low-intensity magnetic tailings, feeding the low-intensity magnetic tailings into a high-intensity magnetic separator for separation (790 KA/m) to obtain high-intensity magnetic concentrate and high-intensity magnetic tailings, combining the low-intensity magnetic concentrate and the high-intensity magnetic concentrate into mixed magnetic concentrate, and discarding the high-intensity magnetic tailings;
concentrating the mixed magnetic concentrate to 70% concentration, and grinding in a regrind mill to obtain a regrind product with-0.038 mm content of 95%; the regrinding mill is a stirring mill, and the adopted grinding medium is ceramic balls;
preparing the reground product into ore pulp with the concentration of 40%, feeding the ore pulp into anion reverse flotation operation, and performing primary coarse-fine three-scavenging separation to obtain flotation concentrate and flotation tailings; the added flotation reagents and the dosage are as follows: adjusting the pH value of the ore pulp to 11.5 by using NaOH as a pH adjusting agent; the dosage of the iron mineral inhibitor starch is 800 g/t; CaO as a quartz activating agent, and the dosage is 950 g/t; the anion collecting agent KS-III is used for roughing with the dosage of 550 g/t and selecting with the dosage of 275 g/t;
the flotation concentrate is the final concentrate, the iron grade of the final concentrate is 65.59 percent, and the recovery rate is 78.22 percent; and combining the flotation tailings and the strong magnetic tailings into final tailings.
Compared with the small-scale experiment of the existing production process, the concentrate grade of the concentrate product of the process is improved by 0.7 percent under the condition of stable recovery rate.
Example 2
The raw ore is hematite containing carbonate (TFe =35.14%, siderite 1.90%, SiO)2= 49.19%), taking the secondary grading overflow product from two sections of continuous closed circuit grinding operation of certain ore dressing plant in Anshan Liaoning, taking back to the laboratory, drying, mixing evenly, taking the secondary grading overflow product as an experimental sample, and measuring that the granularity of the secondary grading overflow product is-200 meshes and accounts for 81%.
The laboratory equipment used was the same as in example 1.
As shown in fig. 2, after preparing the second-stage graded overflow product into ore pulp with the concentration of 30%, feeding the ore pulp into a low-intensity magnetic separator for separation (103.5 KA/m) to obtain low-intensity magnetic concentrate and low-intensity magnetic tailings, feeding the low-intensity magnetic tailings into a high-intensity magnetic separator for separation (790 KA/m) to obtain high-intensity magnetic concentrate and high-intensity magnetic tailings, combining the low-intensity magnetic concentrate and the high-intensity magnetic concentrate into mixed magnetic concentrate, and discarding the high-intensity magnetic tailings;
concentrating the mixed magnetic concentrate to 70% concentration, and grinding in a regrind mill to obtain a regrind product with-0.038 mm content of 90%; the regrinding mill is a stirring mill, and the adopted grinding medium is ceramic balls;
preparing the reground product into ore pulp with the concentration of 40%, feeding the ore pulp into anion reverse flotation operation, and performing primary coarse-fine three-scavenging separation to obtain flotation concentrate and flotation tailings; the added flotation reagents and the dosage are as follows: adjusting the pH value of the ore pulp to 11.5 by using NaOH as a pH adjusting agent; the dosage of the iron mineral inhibitor starch is 950 g/t; CaO as a quartz activator, and the dosage is 1050 g/t; the anion collecting agent KS-III is used for roughing at the dosage of 600g/t and for concentrating at the dosage of 275 g/t;
the flotation concentrate is the final concentrate, the iron grade of the final concentrate is 65.59 percent, and the recovery rate is 78.22 percent;
the flotation concentrate is the final concentrate, the iron grade of the final concentrate is 66.21%, and the recovery rate is 79.52%. And combining the flotation tailings and the strong magnetic tailings into final tailings.
Compared with the small-scale experiment of the existing production process, the concentrate grade of the concentrate product of the process is improved by 0.95 percent under the condition of stable recovery rate.
Claims (4)
1. A short-flow efficient separation process for carbonate-containing iron ore comprises the following steps of carrying out two-stage continuous closed circuit grinding operation on raw ore with the granularity of-12 mm to obtain a-200-mesh 77% -83% second-stage graded overflow product, wherein the step of processing the second-stage graded overflow product comprises the following steps:
step 1, weak magnetic-strong magnetic sorting
Feeding the secondary grading overflow product into a low-intensity magnetic separator for separation to obtain low-intensity magnetic concentrate and low-intensity magnetic tailings, feeding the low-intensity magnetic tailings into a high-intensity magnetic separator for separation to obtain high-intensity magnetic concentrate and high-intensity magnetic tailings, combining the low-intensity magnetic concentrate and the high-intensity magnetic concentrate into mixed magnetic concentrate, and discarding the tail of the high-intensity magnetic tailings;
step 2, finely grinding the ore by a regrind mill
Feeding the mixed magnetic concentrate into a regrind mill for grinding to obtain a regrind product with the content of-0.038 mm accounting for 90% -95%;
step 3, anion reverse flotation
Feeding the reground product into anion reverse flotation operation, and performing primary coarse-fine three-scavenging separation to obtain flotation concentrate and flotation tailings;
the flotation concentrate is the final concentrate, the iron grade of the final concentrate is more than 65.5 percent, and the recovery rate is more than 78 percent; and combining the flotation tailings and the strong magnetic tailings into final tailings.
2. The short-flow efficient separation process of the carbonate-containing iron ore according to claim 1, wherein the raw ore is the carbonate-containing iron ore, the total iron grade is 31-36%, wherein the siderite grade accounts for 1.5-2.5%, and the main gangue mineral is quartz.
3. The short-flow high-efficiency separation process of the carbonate-containing iron ore according to claim 1, wherein the regrind mill is a stirring mill and adopts grinding medium ceramic balls.
4. The short-flow high-efficiency separation process of the carbonate-containing iron ore according to claim 1, wherein in the step 3, the added flotation reagents and the dosage are as follows: adjusting the pH value of the ore pulp to 11.0-11.5 by using NaOH as a pH regulator; the dosage of the iron mineral inhibitor starch is 800-1000 g/t; the dosage of a quartz activating agent CaO is 900 g/t-1100 g/t; and the dosage of the anion collecting agent KS-III is 500 g/t-650 g/t.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4192738A (en) * | 1978-10-23 | 1980-03-11 | The United States Of America As Represented By The Secretary Of The Interior | Process for scavenging iron from tailings produced by flotation beneficiation and for increasing iron ore recovery |
| US5307938A (en) * | 1992-03-16 | 1994-05-03 | Glenn Lillmars | Treatment of iron ore to increase recovery through the use of low molecular weight polyacrylate dispersants |
| 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 |
| CN102728453A (en) * | 2012-06-17 | 2012-10-17 | 鞍钢集团矿业公司 | New technology for sorting lean hematite and magnetite orecontaining iron carbonate |
| CN104014415A (en) * | 2014-05-27 | 2014-09-03 | 鞍钢集团矿业公司 | Technology for treating fine particle dissemination carbonate-containing hematite ore |
| CN108405173A (en) * | 2018-03-09 | 2018-08-17 | 中钢集团马鞍山矿山研究院有限公司 | A kind of fine beneficiation new process of the red water chestnut compound iron ore of magnetic |
| CN108970802A (en) * | 2018-09-20 | 2018-12-11 | 鞍钢集团矿业有限公司 | A kind of floating combined mineral dressing technology of the stage grinding-magnetic-weight-sorting hematite |
| CN109201322A (en) * | 2018-09-20 | 2019-01-15 | 鞍钢集团矿业有限公司 | A kind of sorting process of the hematite containing ferric carbonate |
| AU2019312556A1 (en) * | 2018-11-14 | 2020-04-23 | IB Operations Pty Ltd | Method and apparatus for processing magnetite |
-
2020
- 2020-12-08 CN CN202011421813.XA patent/CN112588430A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4192738A (en) * | 1978-10-23 | 1980-03-11 | The United States Of America As Represented By The Secretary Of The Interior | Process for scavenging iron from tailings produced by flotation beneficiation and for increasing iron ore recovery |
| US5307938A (en) * | 1992-03-16 | 1994-05-03 | Glenn Lillmars | Treatment of iron ore to increase recovery through the use of low molecular weight polyacrylate dispersants |
| 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 |
| CN102728453A (en) * | 2012-06-17 | 2012-10-17 | 鞍钢集团矿业公司 | New technology for sorting lean hematite and magnetite orecontaining iron carbonate |
| CN104014415A (en) * | 2014-05-27 | 2014-09-03 | 鞍钢集团矿业公司 | Technology for treating fine particle dissemination carbonate-containing hematite ore |
| CN108405173A (en) * | 2018-03-09 | 2018-08-17 | 中钢集团马鞍山矿山研究院有限公司 | A kind of fine beneficiation new process of the red water chestnut compound iron ore of magnetic |
| CN108970802A (en) * | 2018-09-20 | 2018-12-11 | 鞍钢集团矿业有限公司 | A kind of floating combined mineral dressing technology of the stage grinding-magnetic-weight-sorting hematite |
| CN109201322A (en) * | 2018-09-20 | 2019-01-15 | 鞍钢集团矿业有限公司 | A kind of sorting process of the hematite containing ferric carbonate |
| AU2019312556A1 (en) * | 2018-11-14 | 2020-04-23 | IB Operations Pty Ltd | Method and apparatus for processing magnetite |
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