CN110813521B - Method for recovering carbon, iron and zinc from blast furnace gas ash - Google Patents
Method for recovering carbon, iron and zinc from blast furnace gas ash Download PDFInfo
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Abstract
The invention relates to the field of mineral processing engineering and discloses a method for recovering carbon, iron and zinc from blast furnace gas ash. The method comprises the following steps: (1) uniformly mixing the gas ash with a collecting agent and a foaming agent; (2) performing roughing on the uniformly mixed ore pulp to obtain carbon concentrate and roughed tailings; (3) adding a collecting agent and a foaming agent into the roughed tailings for scavenging to obtain carbon concentrate and scavenged tailings; (4) grinding the scavenged tailings, and feeding the scavenged tailings into a hydrocyclone for classification to obtain settled sand and overflow products; (5) feeding the overflow product into a hydrocyclone for classification to obtain an overflow product and settled sand; (6) and obtaining zinc concentrate from the overflow product, and carrying out magnetic separation on the settled sand to obtain iron concentrate. The method can simultaneously recover useful components of carbon, iron and zinc in the blast furnace gas ash, and simultaneously, the tailings can be used as raw materials for producing cement, so that the comprehensive utilization of the blast furnace gas ash is realized; and the method has the characteristics of low energy consumption, small pollution, high zinc removal rate and low cost.
Description
Technical Field
The invention relates to the field of mineral processing engineering, in particular to a method for recovering carbon, iron and zinc from blast furnace gas ash.
Background
The blast furnace gas ash is a product obtained by carrying fine particles of raw material dust out of blast furnace flue gas in a blast furnace ironmaking process through gravity dust collection, mainly comprises mineral powder, coke powder, a flux, dust and the like, has important chemical components of valuable elements such as carbon, iron, zinc and the like, and has higher recovery rate and use value. The iron-containing dust and mud of the blast furnace are efficiently utilized, the comprehensive additional value of the iron-containing dust and mud is improved, the environmental pollution is reduced, and the clean production is realized, so that the method becomes a major subject faced by metallurgical enterprises.
The traditional gas ash treatment process directly returns to an iron-making sintering process as a sintering raw material, and the method has the defects that zinc is circularly enriched in a smelting process, so that accretion is formed in a blast furnace, and the blast furnace smelting is influenced. The zinc in the gas ash recovered by the pyrogenic process has the problems of large equipment investment, large pollution, high energy consumption and the like; in addition, the treatment process is carried out by a single magnetic separation process and a flotation process or a combined heavy, magnetic and flotation process, and the processes also have the problem that only a single valuable component is recovered or the zinc in the gas ash cannot be removed.
Disclosure of Invention
The invention aims to solve the problems of high equipment investment, high pollution, high energy consumption, recovery of single valuable component and incapability of removing zinc in the gas ash in the prior art, and provides a method for recovering carbon, iron and zinc from blast furnace gas ash.
In order to achieve the above object, the present invention provides a method for recovering carbon, iron and zinc from blast furnace gas ash, comprising the steps of:
(1) preparing blast furnace gas ash into ore pulp, adding a first collecting agent and a first foaming agent, and uniformly mixing;
(2) performing roughing on the uniformly mixed ore pulp obtained in the step (1) to obtain first carbon concentrate and roughed tailings;
(3) adding a second collecting agent and a second foaming agent into the roughed tailings obtained in the step (2), and then carrying out scavenging to obtain a second carbon concentrate and scavenged tailings;
(4) grinding the scavenged tailings obtained in the step (3), then feeding the scavenged tailings into a primary hydrocyclone for classification, and controlling the primary classification granularity to be 0.036-0.04mm to obtain primary settled sand with the granularity larger than the primary classification granularity and a primary overflow product with the granularity smaller than or equal to the primary classification granularity;
(5) returning the primary sand obtained in the step (4) to the step (4) for further grinding, feeding the primary overflow product obtained in the step (4) into a secondary hydrocyclone for classification, and controlling the secondary classification granularity to be 0.008-0.012mm to obtain a secondary overflow product with the granularity smaller than the secondary classification granularity and secondary sand with the granularity larger than or equal to the secondary classification granularity;
(6) enriching zinc in the secondary overflow product obtained in the step (5) to obtain zinc concentrate; performing magnetic separation on the secondary sand setting obtained in the step (5) to obtain iron ore concentrate and magnetic separation tailings;
(7) and (4) sequentially concentrating, dehydrating and drying the magnetic separation tailings obtained in the step (6).
Preferably, in step (1), the pulp has a concentration of 30-40 wt%.
Preferably, the first collector and the second collector are both diesel and the first and second frothing agents are both pinitol oil or methyl isobutyl carbinol.
Preferably, the total dosage of the first collector and the second collector is 500-800g/t, and the total dosage of the first foaming agent and the second foaming agent is 80-125 g/t.
Preferably, in step (4), the first fraction particle size is 0.037-0.039 mm.
Preferably, in step (5), the secondary classification particle size is 0.009-0.011 mm.
Preferably, in the step (4), the feeding pressure of the primary hydrocyclone is 0.18-0.22 MPa; in the step (5), the feeding pressure of the secondary hydrocyclone is 0.23-0.27 MPa.
Preferably, the diameter of the primary hydrocyclone is 95-105mm, and the diameter of the secondary hydrocyclone is 45-55 mm.
Preferably, the content of the scavenged tailing with the granularity of less than 0.074mm is more than 60 wt%.
Preferably, in the step (6), the magnetic field strength of the magnetic separation is 200-.
The method can simultaneously recover useful components of carbon, iron and zinc in the blast furnace gas ash, and simultaneously the tailings can be used as raw materials for producing cement, so that the comprehensive utilization of the blast furnace gas ash is realized; and the method has the characteristics of low energy consumption, small pollution, high zinc removal rate and low cost.
Drawings
FIGS. 1 and 2 are flow charts of the process for recovering carbon, iron and zinc from blast furnace gas ash according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a method for recovering carbon, iron and zinc from blast furnace gas ash, which comprises the following steps:
(1) preparing blast furnace gas ash into ore pulp, adding a first collecting agent and a first foaming agent, and uniformly mixing;
(2) performing roughing on the uniformly mixed ore pulp obtained in the step (1) to obtain first carbon concentrate and roughed tailings;
(3) adding a second collecting agent and a second foaming agent into the roughed tailings obtained in the step (2), and then carrying out scavenging to obtain a second carbon concentrate and scavenged tailings;
(4) grinding the scavenged tailings obtained in the step (3), then feeding the scavenged tailings into a primary hydrocyclone for classification, and controlling the primary classification granularity to be 0.036-0.04mm to obtain primary settled sand with the granularity larger than the primary classification granularity and a primary overflow product with the granularity smaller than or equal to the primary classification granularity;
(5) returning the primary sand obtained in the step (4) to the step (4) for further grinding, feeding the primary overflow product obtained in the step (4) into a secondary hydrocyclone for classification, and controlling the secondary classification granularity to be 0.008-0.012mm to obtain a secondary overflow product with the granularity smaller than the secondary classification granularity and secondary sand with the granularity larger than or equal to the secondary classification granularity;
(6) enriching zinc in the secondary overflow product obtained in the step (5) to obtain zinc concentrate; performing magnetic separation on the secondary sand setting obtained in the step (5) to obtain iron ore concentrate and magnetic separation tailings;
(7) and (4) sequentially concentrating, dehydrating and drying the magnetic separation tailings obtained in the step (6).
The flow chart of the method for recovering carbon, iron and zinc from blast furnace gas ash according to the invention is shown in fig. 1 and 2.
In the method of the invention, in the step (1), the concentration of the ore pulp can be 30-40 wt%. Specifically, for example, the amount may be 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34 wt%, 35 wt%, 36 wt%, 37 wt%, 38 wt%, 39 wt%, or 40 wt%.
In the method of the present invention, there is no particular limitation on the choice of the means for preparing the blast furnace gas ash into a slurry in step (1), and may be a conventional choice in the art. In a specific embodiment, the blast furnace gas ash is prepared into a slurry in a mixing tank.
In the method of the present invention, there is no particular requirement for the selection of the collector and the gas bubble agent, and these may be conventional selections in the art. In a specific embodiment, the first collector and the second collector are both diesel and the first and second frothing agents are both pine oil or methyl isobutyl carbinol.
In the method of the present invention, the total loading of the first collector and the second collector may be 500-800 g/t. Specifically, it may be, for example, 500g/t, 550g/t, 600g/t, 650g/t, 700g/t, 750g/t or 800 g/t.
In the process of the present invention, the total amount of the first blowing agent and the second blowing agent may be 80 to 125 g/t. Specifically, for example, it may be 80g/t, 85g/t, 90g/t, 95g/t, 100g/t, 105g/t, 110g/t, 115g/t, 120g/t or 125 g/t.
Preferably, in step (4), the first fraction particle size is 0.037-0.039 mm. Specifically, it may be, for example, 0.037mm, 0.038mm or 0.0.39 mm.
Preferably, in step (5), the secondary classification particle size is 0.009-0.011 mm. Specifically, for example, the thickness may be 0.009mm, 0.01mm or 0.011 mm.
In the method of the present invention, in the step (4), there is no particular requirement for the selection of equipment for carrying out grinding, and it may be a routine choice in the art. In a particular embodiment, the grinding is performed in a tower mill.
In the method, in the step (5), the primary sand setting obtained in the step (4) is returned to the step (4) for continuous grinding, a tower mill and a primary hydraulic cyclone can form closed circuit grinding, and the problems of high fine grinding energy consumption, easiness in over-crushing and the like in the grinding process of the traditional mill are solved.
In the method of the invention, in the step (4), the feeding pressure of the primary hydrocyclone can be 0.18-0.22 MPa. Specifically, it may be, for example, 0.18MPa, 0.19MPa, 0.2MPa, 0.21MPa or 0.22 MPa.
In the method of the present invention, in the step (5), the feeding pressure of the secondary hydrocyclone may be 0.23-0.27 MPa. Specifically, it may be, for example, 0.23MPa, 0.24MPa, 0.25MPa, 0.26MPa or 0.27 MPa.
In this context, the pressure refers to absolute pressure.
In the process of the invention, the primary hydrocyclone may have a diameter in the range 95 to 105 mm. Specifically, for example, it may be 95mm, 96mm, 97mm, 98mm, 99mm, 100mm, 101mm, 102mm, 103mm, 104mm or 105 mm.
In the method of the invention, the secondary hydrocyclone may have a diameter of from 45 to 55 mm. Specifically, for example, the thickness may be 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm or 55 mm.
Preferably, the content of the scavenged tailings with the particle size of less than 0.074mm is more than 60 wt%.
In the method, in the step (6), zinc in the secondary overflow product obtained in the step (5) is enriched to obtain zinc concentrate. Preferably, the enrichment factor is between 5 and 8.
In the method of the present invention, in the step (6), the magnetic field strength of the magnetic separation can be 200-350 mT. Specifically, for example, 200mT, 225mT, 250mT, 275mT, 300mT, 325mT, or 350mT is possible.
The method for recovering carbon, iron and zinc from blast furnace gas ash has the following advantages: (1) useful components such as carbon, iron and zinc are recovered from the blast furnace gas ash, and meanwhile, tailings can be used as a cement raw material, so that no solid waste is discharged, and the problems of comprehensive recovery and utilization of valuable components of the blast furnace gas ash and environmental protection are solved; (2) compared with the prior art, the method realizes the dezincification by a physical mineral separation method and obtains a zinc concentrate product, and has the advantages of low energy consumption, little pollution and low cost; (3) the method adopts tower mill hydrocyclone closed circuit grinding, and solves the problems of high fine grinding energy consumption, easy over-crushing and the like in the grinding process of the traditional mill.
The present invention will be described in detail by way of examples, but the scope of the present invention is not limited thereto.
Examples 1-2 and comparative example 1A gas ash from a blast furnace of an iron and steel plant of Panzhihua type was selected, in which the TFe grade was 30.15%, the Zn grade was 6.54%, and the C grade was 20.1%, and the analysis of the main components was as shown in Table 1.
TABLE 1
| Element(s) | S | CaO | MgO | TFe | SiO2 | TiO2 | V2O5 | Al2O3 |
| Grade/% | 0.22 | 3.76 | 2.46 | 30.15 | 5.78 | 5.27 | 0.282 | 3.47 |
| Element(s) | C | Pb | Zn | FeO | K2O | Na2O | Cr2O3 | C solid |
| Grade/% | 20.1 | 0.102 | 6.54 | 7.46 | 0.151 | 0.125 | 0.036 | 18 |
Example 3 blast furnace gas ash of an iron and steel plant in Yunnan was selected, wherein the TFe grade, the Zn grade and the C grade in the blast furnace gas ash were 30.15%, 6.54% and 20.10%, respectively, and the analysis of main components is shown in Table 2.
TABLE 2
| Element(s) | TFe | CaO | MgO | SiO2 | Al2O3 | Zn | C |
| Grade/% | 27.89 | 3.76 | 2.46 | 5.78 | 5.27 | 14.52 | 15.29 |
Example 1
(1) Blending blast furnace gas ash into ore pulp with the concentration of 35 weight percent in a stirring barrel, adding diesel oil and terpineol oil, and uniformly mixing, wherein the dosage of the diesel oil is 600g/t, and the dosage of the terpineol oil is 100 g/t;
(2) performing roughing on the uniformly mixed ore pulp obtained in the step (1) to obtain first carbon concentrate and roughed tailings;
(3) adding diesel oil and pine oil into the roughed tailings obtained in the step (2), wherein the dosage of the diesel oil is 200g/t, and the dosage of the pine oil is 25 g/t; uniformly mixing, and scavenging to obtain second carbon concentrate and scavenged tailings;
(4) grinding the scavenged tailings with the granularity of less than 0.074mm and the content of 67.86 wt% obtained in the step (3) in a tower mill, then feeding the scavenged tailings into a primary hydrocyclone (the diameter of 100mm) for classification, and controlling the primary classification granularity to be 0.038mm and the feeding pressure to be 0.2MPa to obtain primary settled sand with the granularity of more than 0.038mm and a primary overflow product with the granularity of less than or equal to 0.038 mm;
(5) returning the primary settled sand obtained in the step (4) to the tower mill in the step (4) for further grinding, feeding the primary overflow product obtained in the step (4) into a secondary hydrocyclone (the diameter is 50mm) for classification, and controlling the secondary classification granularity to be 0.01mm and the feeding pressure to be 0.25MPa to obtain a secondary overflow product with the granularity smaller than 0.01mm and secondary settled sand with the granularity larger than or equal to 0.01 mm;
(6) enriching zinc in the secondary overflow product obtained in the step (5) to obtain zinc concentrate; performing magnetic separation on the secondary sand setting obtained in the step (5), and controlling the magnetic field intensity to be 300mT to obtain iron ore concentrate and magnetic separation tailings;
(7) and (4) sequentially concentrating, dehydrating and drying the magnetic separation tailings obtained in the step (6).
Example 3
(1) Blending blast furnace gas ash into ore pulp with the concentration of 30 weight percent in a stirring barrel, adding diesel oil and methyl isobutyl carbinol, and uniformly mixing, wherein the using amount of the diesel oil is 400g/t, and the using amount of the methyl isobutyl carbinol is 65 g/t;
(2) performing roughing on the uniformly mixed ore pulp obtained in the step (1) to obtain first carbon concentrate and roughed tailings;
(3) adding diesel oil and methyl isobutyl carbinol into the roughed tailings obtained in the step (2), wherein the diesel oil is 100g/t, and the dosage of the methyl isobutyl carbinol is 15 g/t; uniformly mixing, and scavenging to obtain second carbon concentrate and scavenged tailings;
(4) grinding the scavenged tailings with the granularity of less than 0.074mm and the content of 65.74 wt% obtained in the step (3) in a tower mill, then feeding the scavenged tailings into a primary hydrocyclone (the diameter of 95mm) for classification, and controlling the primary classification granularity to be 0.037mm and the feeding pressure to be 0.18MPa to obtain primary settled sand with the granularity of more than 0.037mm and a primary overflow product with the granularity of less than or equal to 0.037 mm;
(5) returning the primary settled sand obtained in the step (4) to the tower mill in the step (4) for further grinding, feeding the primary overflow product obtained in the step (4) into a secondary hydrocyclone (with the diameter of 45mm) for classification, and controlling the secondary classification granularity to be 0.009mm and the feeding pressure to be 0.23MPa to obtain a secondary overflow product with the granularity smaller than 0.009mm and secondary settled sand with the granularity larger than or equal to 0.009 mm;
(6) enriching zinc in the secondary overflow product obtained in the step (5) to obtain zinc concentrate; performing magnetic separation on the secondary sand setting obtained in the step (5), and controlling the magnetic field intensity to be 200mT to obtain iron ore concentrate and magnetic separation tailings;
(7) and (4) sequentially concentrating, dehydrating and drying the magnetic separation tailings obtained in the step (6).
Example 3
(1) Blending blast furnace gas ash into ore pulp with the concentration of 40 weight percent in a stirring barrel, adding diesel oil and terpineol oil, and uniformly mixing, wherein the dosage of the diesel oil is 500g/t, and the dosage of the terpineol oil is 75 g/t;
(2) performing roughing on the uniformly mixed ore pulp obtained in the step (1) to obtain first carbon concentrate and roughed tailings;
(3) adding diesel oil and pine oil into the roughed tailings obtained in the step (2), wherein the dosage of the diesel oil is 150g/t, and the dosage of the pine oil is 25 g/t; uniformly mixing, and scavenging to obtain second carbon concentrate and scavenged tailings;
(4) grinding the scavenged tailings with the granularity of less than 0.074mm and the content of 60.22 wt% obtained in the step (3) in a tower mill, feeding the scavenged tailings into a primary hydrocyclone (the diameter of 95mm) for classification, and controlling the primary classification granularity to be 0.039mm and the feeding pressure to be 0.22MPa to obtain primary settled sand with the granularity of more than 0.039mm and a primary overflow product with the granularity of less than or equal to 0.039 mm;
(5) returning the primary settled sand obtained in the step (4) to the tower mill in the step (4) for continuous ore grinding, feeding the primary overflow product obtained in the step (4) into a secondary hydrocyclone (with the diameter of 55mm) for classification, and controlling the secondary classification granularity to be 0.011mm and the feeding pressure to be 0.27MPa to obtain a secondary overflow product with the granularity of less than 0.011mm and secondary settled sand with the granularity of more than or equal to 0.011 mm;
(6) enriching zinc in the secondary overflow product obtained in the step (5) to obtain zinc concentrate; performing magnetic separation on the secondary sand setting obtained in the step (5), and controlling the magnetic field intensity to be 350mT to obtain iron ore concentrate and magnetic separation tailings;
(7) and (4) sequentially concentrating, dehydrating and drying the magnetic separation tailings obtained in the step (6).
Comparative example 1
The blast furnace gas ash is treated by adopting the traditional combined treatment process of gravity, magnetism and floatation.
Test example
The C grade and recovery rate of the carbon concentrates, the Zn grade and recovery rate of the zinc concentrate, and the TFe grade and recovery rate of the iron concentrate were measured in examples 1 to 3 and comparative example 1, wherein the carbon concentrates in examples 1 to 3 were the sum of the first carbon concentrate and the second carbon concentrate, and the results are shown in table 3.
TABLE 3
| Example numbering | Grade C | Recovery (%) | Zn grade | Recovery (%) | Grade of TFe | Recovery (%) |
| Example 1 | 82.86 | 94.87 | 46.53 | 78.54 | 56.78 | 81.25 |
| Example 2 | 81.55 | 93.74 | 46.88 | 79.61 | 55.68 | 80.82 |
| Example 3 | 79.24 | 94.54 | 47.53 | 76.54 | 54.78 | 80.25 |
| Comparative example 1 | 76.21 | 87.52 | 30.54 | 50.22 | 49.56 | 76.33 |
It can be seen from the results of table 3 that the recovery rates of carbon, iron and zinc in examples 1 to 3 are superior to those of the comparative example, which shows that the useful components of carbon, iron and zinc can be simultaneously recovered by the method of the present invention, and that the recovery rates are high, and the comprehensive utilization of blast furnace gas ash can be realized.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (7)
1. A method for recovering carbon, iron and zinc from blast furnace gas ash, comprising the steps of:
(1) preparing blast furnace gas ash into ore pulp, adding a first collecting agent and a first foaming agent, and uniformly mixing;
(2) performing roughing on the uniformly mixed ore pulp obtained in the step (1) to obtain first carbon concentrate and roughed tailings;
(3) adding a second collecting agent and a second foaming agent into the roughed tailings obtained in the step (2), and then carrying out scavenging to obtain a second carbon concentrate and scavenged tailings;
(4) grinding the scavenged tailings obtained in the step (3), then feeding the scavenged tailings into a primary hydrocyclone for classification, and controlling the primary classification granularity to be 0.036-0.04mm to obtain primary settled sand with the granularity larger than the primary classification granularity and a primary overflow product with the granularity smaller than or equal to the primary classification granularity;
(5) returning the primary sand obtained in the step (4) to the step (4) for further grinding, feeding the primary overflow product obtained in the step (4) into a secondary hydrocyclone for classification, and controlling the secondary classification granularity to be 0.008-0.012mm to obtain a secondary overflow product with the granularity smaller than the secondary classification granularity and secondary sand with the granularity larger than or equal to the secondary classification granularity;
(6) enriching zinc in the secondary overflow product obtained in the step (5) to obtain zinc concentrate; performing magnetic separation on the secondary sand setting obtained in the step (5) to obtain 1 iron ore concentrate and magnetic separation tailings;
(7) sequentially concentrating, dehydrating and drying the magnetic separation tailings obtained in the step (6);
in the step (1), the concentration of the ore pulp is 30-40 wt%;
in the step (4), the feeding pressure of the primary hydrocyclone is 0.18-0.22 MPa; in the step (5), the feeding pressure of the secondary hydrocyclone is 0.23-0.27 MPa;
the content of the scavenged tailings with the granularity of less than 0.074mm is more than 60 percent by weight.
2. The method of recovering carbon, iron, and zinc from blast furnace gas ash of claim 1, wherein the first collector and the second collector are both diesel and the first and second frothing agents are both pine oil or methyl isobutyl carbinol.
3. The method for recovering carbon, iron and zinc from blast furnace gas ash according to claim 2, wherein the total dosage of the first collector and the second collector is 500-800g/t, and the total dosage of the first foaming agent and the second foaming agent is 80-125 g/t.
4. The method for recovering carbon, iron and zinc from blast furnace gas ash according to claim 1, wherein in step (4), the primary classification particle size is 0.037-0.039 mm.
5. The method for recovering carbon, iron and zinc from blast furnace gas ash according to claim 1, wherein in step (5), the secondary classification particle size is 0.009-0.011 mm.
6. The method of claim 1, wherein the primary hydrocyclone has a diameter of 95-105mm and the secondary hydrocyclone has a diameter of 45-55 mm.
7. The method for recovering carbon, iron and zinc from blast furnace gas ash as claimed in claim 1, wherein in step (6), the magnetic field strength of the magnetic separation is 200-350 mT.
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| CN115608517A (en) * | 2021-02-05 | 2023-01-17 | 李刚强 | Efficient separation method for blast furnace cloth bag dedusting ash |
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