CN115155799A - Beneficiation method for grading and recleaning of high-purity iron ore concentrate from iron ore tailings - Google Patents
Beneficiation method for grading and recleaning of high-purity iron ore concentrate from iron ore tailings Download PDFInfo
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- CN115155799A CN115155799A CN202210821653.0A CN202210821653A CN115155799A CN 115155799 A CN115155799 A CN 115155799A CN 202210821653 A CN202210821653 A CN 202210821653A CN 115155799 A CN115155799 A CN 115155799A
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- iron ore
- concentrate
- tailings
- magnetic separation
- magnetic
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 200
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 100
- 239000012141 concentrate Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007885 magnetic separation Methods 0.000 claims abstract description 45
- 238000005188 flotation Methods 0.000 claims abstract description 17
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 13
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 13
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 239000004088 foaming agent Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 14
- 229910052595 hematite Inorganic materials 0.000 description 5
- 239000011019 hematite Substances 0.000 description 5
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 5
- 229940005740 hexametaphosphate Drugs 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
-
- 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
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
Abstract
The invention discloses a beneficiation method for grading and recleaning of high-purity iron ore concentrate from iron ore tailings, and belongs to the technical field of beneficiation. The ore dressing method comprises the steps of crushing iron ore to be treated, carrying out first magnetic separation on the crushed ore, separating and selecting iron ore concentrate and tailings with TFe grade of more than 60%, then carrying out second magnetic separation on the obtained tailings, selecting iron ore concentrate with TFe grade of 50-55%, finally combining the obtained iron ore concentrate with TFe grade of more than 60% and the obtained iron ore concentrate with TFe grade of 50-55%, and carrying out flotation to obtain iron ore concentrate. The invention adopts a specific magnetic separation process, greatly improves the magnetic separation efficiency of the iron ore, has high iron recovery rate and high grade promotion, and ensures that the iron resource value is maximally applied.
Description
Technical Field
The invention belongs to the technical field of ore dressing, and particularly relates to an ore dressing method for grading and recleaning high-purity iron ore concentrate from iron ore tailings.
Background
The iron ore resources in China are very rich, and the geology in China is diversified, so that the condition of forming the iron ore is complex and the types of the iron ore are various. The resource reserves of the iron ores are cumulatively found out in China by 680 hundred million tons, wherein the resource reserves of the hematite reach 95.93 hundred million tons, account for 18.10 percent of the types of the iron ores available in China, and are second only to magnetite. Controlled by a ground construction environment, iron ore in China has the characteristics of poor quality, fine quality and impurity, more poor ores and less rich ores, and the average TFe grade is only about 33 percent.
Hematite is an iron ore with high density and weak magnetism, and many ore dressing methods capable of effectively separating hematite in industrial production are provided. The traditional hematite dressing method comprises gravity separation, flotation, roasting magnetic separation and strong magnetic separation, but because the mineral composition and the ore property of actual hematite ore are more complex, a single dressing method is difficult to adapt to the recovery of associated metals, and the total recovery rate and the iron dressing index of iron are also difficult to guarantee.
At present, the comprehensive recycling problem of iron tailings is widely concerned by the whole society.
Therefore, it is highly desirable to develop a more suitable grading combined beneficiation process to realize the effective utilization of iron ore, particularly iron tailings.
Disclosure of Invention
The invention aims to provide a beneficiation method for grading and recleaning high-purity iron ore concentrate from iron ore tailings.
In order to achieve the above purpose, the solution of the invention is:
a beneficiation method for grading and recleaning of high-purity iron ore concentrate from iron ore tailings, wherein the iron ore is the iron tailings, comprises the following steps:
step 1, crushing iron ore to be processed to obtain crushed ore;
step 2, carrying out first magnetic separation on the crushed ore, and sorting out iron ore concentrate and tailings with TFe grade of more than 60%;
step 3, carrying out secondary magnetic separation on the tailings obtained in the step 2 to select iron ore concentrate with TFe grade of 50-55%;
and 4, combining the iron ore concentrate with the TFe grade of more than 60 percent obtained in the step 2 and the iron ore concentrate with the TFe grade of 50-55 percent obtained in the step 3, and performing flotation to obtain the iron ore concentrate.
Further, the crushing in the step 1 comprises coarse crushing and fine crushing, wherein the coarse crushing is carried out until the size of 200-250 mm accounts for more than 70% to obtain coarse crushed ore, and the fine crushing is carried out until the size of 40-60 mm accounts for more than 70% to obtain fine crushed ore.
Further, the first magnetic separation in the step 2 is strong magnetic separation or/and weak magnetic separation.
Furthermore, when the iron ore to be processed does not contain magnetic iron or the content of the magnetic iron is less than 5%, the crushed ore is subjected to strong magnetic separation, and iron ore concentrate and tailings with the TFe grade of more than 60% are separated.
Preferably, the magnetic field intensity of the strong magnetic separation is 115-125 KA/m.
Further, when the content of magnetic iron in the iron ore to be processed is more than 5%, performing low-intensity magnetic separation on the crushed ore, separating out low-intensity magnetic concentrate and low-intensity magnetic tailings with the TFe grade of more than 60%, then performing high-intensity magnetic separation on the low-intensity magnetic tailings, separating out high-intensity magnetic concentrate and high-intensity magnetic tailings with the TFe grade of more than 60%, and combining the low-intensity magnetic concentrate with the TFe grade of more than 60% and the high-intensity magnetic concentrate with the TFe grade of more than 60% into iron concentrate with the TFe grade of more than 60%.
Preferably, the magnetic field intensity of the low-intensity magnetic separation is 30-35 KA/m, and the magnetic field intensity of the high-intensity magnetic separation is 115-125 KA/m.
Furthermore, the magnetic field intensity of the second magnetic separation in the step 3 is 115-125 KA/m.
Further, in the step 4, a jet flow flotation machine is adopted as flotation equipment, sulfuric acid is adopted as a pH regulator, the pH value is 3-4.5, sodium hexametaphosphate is adopted as a dispersing agent, the using amount of the sodium hexametaphosphate is 100-200g/t, MOH is adopted as a collecting agent, the total using amount of the MOH is 1000-2000g/t, and No. 2 oil is used as a foaming agent, and the using amount of the foaming agent is 60-80g/t.
The method adopts a specific magnetic separation process, greatly improves the magnetic separation efficiency of the iron ore tailings, has high iron recovery rate and high grade promotion, and ensures that the iron resource value is maximally applied.
Detailed Description
The invention is described in further detail below with reference to the following description, but should not be construed as being limited thereto. Modifications or substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit and scope of the invention. The experimental methods and reagents of the formulations not specified in the examples are in accordance with the conventional conditions in the art.
Example 1
The TFe grade of the iron ore to be processed is 48-50%, and the content of magnetic iron is 1.5%. The method comprises the following steps:
step 1, crushing iron ore to be processed to obtain crushed ore;
the crushing comprises coarse crushing and fine crushing, wherein the coarse crushing is carried out until the size of 200-250 mm accounts for more than 78% to obtain coarse crushed ore, and then the fine crushing is carried out until the size of 40-60 mm accounts for more than 80% to obtain fine crushed ore.
And 2, carrying out first magnetic separation on the crushed ore, wherein the magnetic field strength is 120KA/m, the yield of the obtained concentrate is 47.2%, the TFe grade of the concentrate is 61.2%, the recovery rate is 57.2%, and the TFe grade of the tailings is 31.5%.
And 3, carrying out second magnetic separation on the tailings obtained in the step 2, wherein the magnetic field intensity of the second magnetic separation is 125KA/m, the yield of the obtained concentrate is 9.57%, the TFe grade of the concentrate is 50.8%, the recovery rate is 57.2%, and the TFe grade of the tailings is 19.8%.
And 4, combining the iron ore concentrate with the TFe grade of more than 60 percent obtained in the step 2 and the iron ore concentrate with the TFe grade of 50-55 percent obtained in the step 3, and performing flotation, wherein a jet flow flotation machine is adopted as flotation equipment, sulfuric acid is adopted as a pH regulator, the pH value is 3.5, sodium hexametaphosphate is adopted as a dispersing agent, the dosage of the sodium hexametaphosphate is 150g/t, MOH is adopted as a collecting agent, the total dosage of the sodium hexametaphosphate is 1400g/t, and No. 2 oil is adopted as a foaming agent, and the dosage of the oil hexametaphosphate is 70g/t.
The final yield was 75.13%, the concentrate TFe grade was 64.1%, and the recovery was 92.15%.
Example 2
The TFe grade of the iron ore to be processed is 32-35%, and the content of magnetic iron is 6.8%. The method comprises the following steps:
step 1, crushing iron ore to be processed to obtain crushed ore;
the crushing comprises coarse crushing and fine crushing, wherein the coarse crushing is carried out until the size of 200-250 mm accounts for more than 78% to obtain coarse crushed ore, and then the fine crushing is carried out until the size of 40-60 mm accounts for more than 80% to obtain fine crushed ore.
Step 2, carrying out first magnetic separation on the crushed ore, and sorting out iron ore concentrate and tailings with TFe grade of more than 60%;
the first magnetic separation is weak magnetic separation and strong magnetic separation. Carrying out low-intensity magnetic separation on the crushed ore, wherein the magnetic field intensity is 30KA/m, and recovering magnetic iron in advance to obtain low-intensity magnetic concentrate with the concentrate yield of 7.52 percent, the concentrate TFe grade of 61.5 percent and the recovery rate of 15.78 percent and low-intensity magnetic tailings with the grade of 32 percent; and then carrying out strong magnetic separation on the weak magnetic tailings with the magnetic field intensity of 125KA/m to obtain the weak magnetic concentrate with the concentrate yield of 18.52 percent, the concentrate TFe grade of 62.1 percent and the recovery rate of 32.57 percent and the weak magnetic tailings with the grade of 23.4 percent.
And 3, carrying out second magnetic separation on the tailings obtained in the step 2, wherein the magnetic field intensity of the second magnetic separation is 115KA/m, the yield of the obtained concentrate is 20.35%, the TFe grade of the concentrate is 51.2%, the recovery rate is 31.7%, and the TFe grade of the tailings is 12.3%.
And 4, combining the iron ore concentrate with the TFe grade of more than 60 percent obtained in the step 2 and the iron ore concentrate with the TFe grade of 50-55 percent obtained in the step 3, and performing flotation, wherein a jet flow flotation machine is adopted as flotation equipment, sulfuric acid is adopted as a pH regulator, the pH value is 3.8, sodium hexametaphosphate is adopted as a dispersing agent, the dosage of the sodium hexametaphosphate is 140g/t, MOH is adopted as a collecting agent, the total dosage of the sodium hexametaphosphate is 1600g/t, and No. 2 oil is adopted as a foaming agent, and the dosage of the oil hexametaphosphate is 60g/t.
The final concentrate TFe grade is 62.8 percent, and the recovery rate is 82.45 percent.
Example 3
The TFe grade of the iron ore to be processed is 48-50%, and the iron ore does not contain magnetic iron. The method comprises the following steps:
step 1, crushing iron ore to be processed to obtain crushed ore;
the crushing comprises coarse crushing and fine crushing, wherein the coarse crushing is firstly carried out until the size of 200-250 mm accounts for more than 78%, so as to obtain coarse crushed ore, and then the fine crushing is carried out until the size of 40-60 mm accounts for more than 80%, so as to obtain fine crushed ore.
And 2, carrying out first magnetic separation on the crushed ore, wherein the magnetic field strength is 125KA/m, the yield of the obtained concentrate is 25.7%, the TFe grade of the concentrate is 60.8%, the recovery rate is 45.7%, and the TFe grade of the tailings is 28.9%.
And 3, carrying out second magnetic separation on the tailings obtained in the step 2, wherein the magnetic field intensity is 120KA/m, the yield of the obtained concentrate is 12.15%, the TFe grade of the concentrate is 51.2%, the recovery rate is 43.5%, and the TFe grade of the tailings is 20.1%.
And 4, combining the iron ore concentrate with the TFe grade of more than 60 percent obtained in the step 2 and the iron ore concentrate with the TFe grade of 50-55 percent obtained in the step 3, and performing flotation, wherein a jet flow flotation machine is adopted as flotation equipment, sulfuric acid is adopted as a pH regulator, the pH value is 3.6, sodium hexametaphosphate is adopted as a dispersing agent, the dosage of the sodium hexametaphosphate is 160g/t, MOH is adopted as a collecting agent, the total dosage of the sodium hexametaphosphate is 1500g/t, and No. 2 oil is used as a foaming agent and is 75g/t.
The final yield was 40.15%, the concentrate TFe grade 63.2%, and the recovery was 89.7%.
Claims (9)
1. A beneficiation method for grading and recleaning of high-purity iron ore concentrate from iron ore tailings is characterized in that: the method comprises the following steps:
1, crushing iron ore to be processed to obtain crushed ore;
step 2, carrying out first magnetic separation on the crushed ore, and sorting out iron ore concentrate and tailings with TFe grade of more than 60%;
step 3, carrying out secondary magnetic separation on the tailings obtained in the step 2, and selecting iron ore concentrate with TFe grade of 50-55%;
and 4, combining the iron ore concentrate with the TFe grade of more than 60 percent obtained in the step 2 and the iron ore concentrate with the TFe grade of 50-55 percent obtained in the step 3, and performing flotation to obtain the iron ore concentrate.
2. The beneficiation method for grading and recleaning of high purity iron ore concentrate from iron ore tailings according to claim 1, wherein: the crushing in the step 1 comprises coarse crushing and fine crushing, wherein the coarse crushing is carried out until the size of 200-250 mm accounts for more than 70% to obtain coarse crushed ore, and then the fine crushing is carried out until the size of 40-60 mm accounts for more than 70% to obtain fine crushed ore.
3. The beneficiation method for grading and recleaning of high purity iron ore concentrate from iron ore tailings according to claim 1, wherein: and 2, the first magnetic separation in the step 2 is strong magnetic separation or/and weak magnetic separation.
4. The beneficiation method for grading and recleaning of high purity iron ore concentrate from iron ore tailings according to claim 3, wherein: and when the iron ore to be treated does not contain magnetic iron or the content of the magnetic iron is less than 5%, performing strong magnetic separation on the crushed ore, and sorting out iron ore concentrate and tailings with the TFe grade of more than 60%.
5. The beneficiation method for grading and recleaning of high-purity iron ore concentrate according to the iron ore tailings, according to claim 4, wherein: the magnetic field intensity of the strong magnetic separation is 115-125 KA/m.
6. The beneficiation method for grading and recleaning of high purity iron ore concentrate from iron ore tailings according to claim 3, wherein: when the content of magnetic iron in the iron ore to be processed is more than 5%, performing low intensity magnetic separation on the crushed ore, separating out low intensity magnetic concentrate and low intensity magnetic tailings with the TFe grade of more than 60%, then performing high intensity magnetic separation on the low intensity magnetic tailings, separating out high intensity magnetic concentrate and high intensity magnetic tailings with the TFe grade of more than 60%, and combining the low intensity magnetic concentrate with the TFe grade of more than 60% and the high intensity magnetic concentrate with the TFe grade of more than 60% into iron concentrate with the TFe grade of more than 60%.
7. The beneficiation method for grading and recleaning of high purity iron ore concentrate by iron ore tailings according to claim 6, wherein: the magnetic field intensity of the low-intensity magnetic separation is 30-35 KA/m, and the magnetic field intensity of the high-intensity magnetic separation is 115-125 KA/m.
8. The beneficiation method for grading and recleaning of high purity iron ore concentrate from iron ore tailings according to claim 1, wherein: the magnetic field intensity of the second magnetic separation in the step 3 is 115-125 KA/m.
9. The beneficiation method for grading and recleaning of high purity iron ore concentrate from iron ore tailings according to claim 1, wherein: in the step 4, a jet flow flotation machine is adopted as flotation equipment, sulfuric acid is adopted as a pH regulator, the pH value is 3-4.5, sodium hexametaphosphate is adopted as a dispersing agent, the dosage of the sodium hexametaphosphate is 100-200g/t, MOH is adopted as a collecting agent, the total dosage of the MOH is 1000-2000g/t, and No. 2 oil is used as a foaming agent, and the dosage of the MOH is 60-80g/t.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210821653.0A CN115155799A (en) | 2022-07-13 | 2022-07-13 | Beneficiation method for grading and recleaning of high-purity iron ore concentrate from iron ore tailings |
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| CN202210821653.0A CN115155799A (en) | 2022-07-13 | 2022-07-13 | Beneficiation method for grading and recleaning of high-purity iron ore concentrate from iron ore tailings |
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|---|---|---|---|---|
| AU2008100427A4 (en) * | 2008-03-05 | 2008-07-03 | Central South Univeristy | Efficient separation method for low grade complex iron ore |
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| CN102172556A (en) * | 2010-12-07 | 2011-09-07 | 东北大学 | High-pressure roller milling-preselection processing method for vanadic titanomagnetite |
| CN102319614A (en) * | 2011-06-20 | 2012-01-18 | 米建国 | Benefication method for recovering ilmenite from iron tailings in Shandong area |
| CN110193423A (en) * | 2019-07-05 | 2019-09-03 | 长沙矿冶研究院有限责任公司 | A kind of beneficiation method obtaining high-purity refined iron-mineral from iron ore |
| WO2022052718A1 (en) * | 2020-09-09 | 2022-03-17 | 中钢集团马鞍山矿山研究总院股份有限公司 | Beneficiation method for preparing ultrapure iron ore concentrate from magnetite concentrates |
| CN114669395A (en) * | 2022-04-15 | 2022-06-28 | 西北矿冶研究院 | Beneficiation process for low-grade fine-grain dip-dyed maghemite |
-
2022
- 2022-07-13 CN CN202210821653.0A patent/CN115155799A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2008100427A4 (en) * | 2008-03-05 | 2008-07-03 | Central South Univeristy | Efficient separation method for low grade complex iron ore |
| CN101850295A (en) * | 2010-05-06 | 2010-10-06 | 中钢集团马鞍山矿山研究院有限公司 | Beneficiation method for producing high-quality iron ore concentrate by low-grade magnetic iron ore |
| CN102172556A (en) * | 2010-12-07 | 2011-09-07 | 东北大学 | High-pressure roller milling-preselection processing method for vanadic titanomagnetite |
| CN102319614A (en) * | 2011-06-20 | 2012-01-18 | 米建国 | Benefication method for recovering ilmenite from iron tailings in Shandong area |
| CN110193423A (en) * | 2019-07-05 | 2019-09-03 | 长沙矿冶研究院有限责任公司 | A kind of beneficiation method obtaining high-purity refined iron-mineral from iron ore |
| WO2022052718A1 (en) * | 2020-09-09 | 2022-03-17 | 中钢集团马鞍山矿山研究总院股份有限公司 | Beneficiation method for preparing ultrapure iron ore concentrate from magnetite concentrates |
| CN114669395A (en) * | 2022-04-15 | 2022-06-28 | 西北矿冶研究院 | Beneficiation process for low-grade fine-grain dip-dyed maghemite |
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