CN112973951B - Technological method for improving precision of desulfurized iron rough concentrate - Google Patents
Technological method for improving precision of desulfurized iron rough concentrate Download PDFInfo
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- CN112973951B CN112973951B CN201911276657.XA CN201911276657A CN112973951B CN 112973951 B CN112973951 B CN 112973951B CN 201911276657 A CN201911276657 A CN 201911276657A CN 112973951 B CN112973951 B CN 112973951B
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- cyclone
- stirring barrel
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- ore
- grinding
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000012141 concentrate Substances 0.000 title claims abstract description 32
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 102
- 238000000227 grinding Methods 0.000 claims abstract description 32
- 239000006260 foam Substances 0.000 claims abstract description 15
- 239000003814 drug Substances 0.000 claims abstract description 7
- 239000004576 sand Substances 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011574 phosphorus Substances 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 230000003139 buffering effect Effects 0.000 claims abstract description 5
- 238000005188 flotation Methods 0.000 claims description 32
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 13
- 239000011593 sulfur Substances 0.000 claims description 13
- 229910052717 sulfur Inorganic materials 0.000 claims description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims description 10
- 239000012991 xanthate Substances 0.000 claims description 10
- 230000002000 scavenging effect Effects 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims 1
- 238000011946 reduction process Methods 0.000 claims 1
- 238000010408 sweeping Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000011707 mineral Substances 0.000 description 8
- 238000006477 desulfuration reaction Methods 0.000 description 6
- 230000023556 desulfurization Effects 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000008396 flotation agent Substances 0.000 description 1
- 239000004088 foaming agent Substances 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
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a process method for improving the precision of desulfurized iron rough concentrate, which comprises the following steps: the ore feeding and grinding adopts two sections of closed-circuit continuous grinding, the ore is ground by a first section of ball mill, the grinding is carried out by a spiral classifier, the sand returned by the classifier returns to the first section of ball mill, the classifier overflows to a second section of cyclone pump pool, the cyclone is fed to the cyclone for classification by a cyclone pump, the cyclone underflow is fed to the second section of ball mill for secondary grinding, ore pulp is fed to the cyclone for classification again by the cyclone pump after grinding, the cyclone overflow is fed to the ore pulp buffer box for collecting and buffering firstly, then the ore pulp, yellow medicine and oil are fully stirred in the stirring barrel and enter roughing operation, roughing foam is subjected to three times of concentration operation, the concentration foam returns to the previous stage for reselection, the sweeping underflow is desulphurized iron concentrate, and the ore concentrate is subjected to the screening of the next phosphorus reduction procedure if the index is unqualified, and the ore pulp is still required to be subjected to roughing selection for resumption screening.
Description
Technical Field
The invention relates to a process method, in particular to a process method for improving the precision of desulfurized iron rough concentrate, and belongs to the technical field of flotation and mineral separation.
Background
The equipment for directly completing the flotation process is mainly used for desulfurization in production, the ore entering grinding and feeding adopts two sections of closed-circuit continuous grinding, the ore is ground by a first section of ball mill and then is graded by a spiral grader, returned sand returns to the first section of ball mill, overflow is fed into the second section of spiral grader for grading, graded returned sand is fed into the second section of ball mill for grinding, ore pulp is fed into the second section of spiral grader for grading after grinding, secondary overflow of the spiral grader is fed into a flotation process, the flotation process is divided into roughing operation, concentration operation and scavenging operation, ball milling secondary overflow ore pulp flows to a stirring barrel and xanthate and No. 2 oil after being fully stirred, roughing foam is subjected to three concentration operation, foam returns to the previous stage of roughing operation, concentration is sulfur concentrate, and sulfur concentrate is a raw material for producing sulfuric acid.
The scavenging underflow is desulfurized iron concentrate, the iron concentrate is obtained after the separation of the process of lowering phosphorus in the downlink, and if the index is unqualified, the sulfur content is returned to the coarse separation and then the screening is continued.
The flotation machine is a device for directly completing the flotation process, the ground ore pulp and the flotation agent are mixed and then sent into the flotation machine for aeration stirring, so that the target mineral (sulfur concentrate) to be floated is attached to bubbles to form mineralized bubbles, floats to the surface of the ore pulp and forms a mineralized bubble layer, the bubbles are scraped (or overflowed) by a scraper to obtain a foam product, and the non-foam product is discharged from the bottom of the tank, thereby realizing the flotation separation process of the mineral, and the quality of the flotation technical and economic indexes is closely related to the performance of the flotation machine.
Through the statistics of faults of the flotation machine, the faults directly affect the production of the flotation machine, if the faults are not timely diagnosed and removed, the yield of mineral powder is directly affected, and meanwhile, the production cost is increased. Therefore, the problem of the fault of the good flotation machine is solved, and the method has important significance for the whole ore dressing production.
In the current production, four series of flotation machines are unstable in operation, the sulfur content of the desulfurized iron concentrate exceeds the standard, the amount of returning to roughing and then continuously screening is larger and larger, the using amount of xanthate and No. 2 oil is larger and larger, the desulfurization effect is poor, the environment is polluted, and all the processes and methods for improving the precision of the desulfurized iron rough concentrate are urgently needed.
The main problems are as follows:
1. the overflow of the ball mill is not smooth in ore feeding, so that the classified cyclone is often in ore diffusion and pipeline blockage;
2. the stirring barrel is pressed, and the stable operation of each series is affected;
3. the flotation separation of minerals is insufficient, foam products are discharged from the bottom of the tank, and the flotation technical and economic indexes are low;
4. the desulfurization effect is poor, the using amount of xanthate and No. 2 oil is excessive, the tailing drainage exceeds the standard, and the environment is polluted, so that a new scheme is urgently needed to solve the technical problems.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a process method for improving the precision of the desulfurized iron rough concentrate.
In order to achieve the above purpose, the technical scheme of the invention is as follows, a process method for improving the precision of the desulfurized iron rough concentrate, the method comprises the following steps:
The feeding grinding adopts two sections of closed-circuit continuous grinding, the grinding is carried out by a first section of ball mill, then the grinding is graded by a spiral grading machine, the return sand of the grading machine returns to the first section of ball mill, the overflow of the grading machine is fed into a second section of cyclone pump pool,
Feeding the cyclone to the cyclone pump for classification, feeding the underflow of the cyclone to the second-stage ball mill for secondary grinding,
The ore pulp is fed into a cyclone for classification again through a cyclone pump after ore grinding, the overflow of the cyclone is fed into an ore pulp buffer box for collecting and buffering, then the ore pulp, xanthate and oil are fed into a stirring barrel through a pipeline, the ore pulp, xanthate and oil are fully stirred in the stirring barrel and then enter a roughing operation, roughing foam is subjected to three concentration operations, the concentration foam returns to the previous stage for reselection, and the concentration underflow is sulfur concentrate which is the raw material for preparing sulfuric acid;
The scavenging underflow is desulfurized iron concentrate, the iron concentrate is obtained after the separation of the process of lowering phosphorus in the downlink, and if the index is unqualified, the sulfur content is returned to the coarse separation and then the screening is continued. The buffer box is additionally arranged between the cyclone and the stirring barrel, so that the problems that overflow of the ball mill is not smooth in ore feeding, the cyclone is diffusely ore and a pipeline is blocked in classification, the stirring barrel is pressed down, and the like are solved.
As an improvement of the invention, in the steps, the grinding machine is connected with the spiral classifier, the spiral classifier is connected with the cyclone, the cyclone is connected with the ball mill, the ball mill is connected with the cyclone pump pool, the outlet of the cyclone pump pool is connected with the buffer box, the outlet of the buffer box is connected with the stirring barrel, and the outlet of the stirring barrel is connected with the flotation machine.
As an improvement of the invention, the buffer box is provided with a buffer box feed inlet which is respectively connected with four series of cyclone discharge ports, and an inner inclined buffer layer is added in the buffer box to reduce the raw ore feeding speed and prevent mineral aggregate accumulation, and the buffer box discharge port is connected with the stirring barrel.
As an improvement of the invention, the discharge hole of the buffer box is required to be positioned at the position (the lower edge of the pipe orifice) of more than 20cm below the bottom of the buffer box, the heights of the stirring barrel and the overflow pipe of the flotation machine are reduced by 0.5-0.6m, the ore accumulation of the stirring barrel is reduced, and the discharge hole of the buffer box is connected with a pipeline And (5) a wear-resistant pipe.
As an improvement of the invention, the stirring barrel is composed of a rotary stirring motor in the stirring barrel, a rotary stirring motor outside the stirring barrel, a stirring barrel feed box and a stirring barrel discharge hole, wherein the rotary stirring motor inside the stirring barrel is arranged at the top of the stirring barrel, the rotary stirring motor outside the stirring barrel is arranged at the side part of the stirring barrel, the rotary stirring motor outside the stirring barrel realizes left and right rotary stirring, the rotary stirring motor inside the stirring barrel realizes middle stirring, and the two stirring motors work to form a bidirectional spiral stirring barrel, so that raw ore and medicament fully stir and react.
As an improvement of the invention, the heights of the discharge hole of the stirring barrel and the overflow pipe of the flotation machine are reduced by 0.5-0.6m, and the ore deposit of the stirring barrel is reduced.
Compared with the prior art, the invention has the advantages that 1) the ore pulp buffer box is added between the cyclone and the stirring barrel in the technical scheme, so that four series of raw ores are fully reacted with the medicament through the buffer box to achieve full desulfurization; 2) The discharge hole of the buffer box is required to be positioned at a position (the lower edge of a pipe orifice) of more than 20cm below the lower bottom of the buffer box; a plurality of inward inclined buffer layers are arranged in the buffer box, so that the raw ore supply speed is reduced; the opening of the stirring barrel is higher than any opening (the lower edge of the pipe orifice); for connecting pipesA wear resistant tube; 3) In the scheme, a bidirectional spiral stirring barrel which rotates left and right and is stirred in the middle is designed, so that raw ore and a medicament are fully stirred and reacted, the heights of a discharge hole of the stirring barrel and an overflow pipe of a flotation machine are reduced by 0.5-0.6m, and the ore accumulation of the stirring barrel is reduced; 4) The scheme solves the problem that four series ball mills overflow and ore feeding are not smooth, the classification cyclone does not scatter ore any more and the pipeline is not blocked any more, and the production is stable; 5) The scheme solves the problem that the stirring barrel is frequently pressed, and each series of stirring barrels stably run, so that the production efficiency is improved; 6) The scheme realizes the full stirring of the raw ore, xanthate and foaming agent oil, reduces the sulfur content of the iron concentrate, and improves the technical index of the desulfurized iron rough concentrate.
Drawings
FIG. 1 is a flow chart of the overall process of the present invention;
FIG. 2 is a top view of the process equipment of the present invention;
FIG. 3 is a side view of the process equipment of the present invention;
FIG. 4 is a schematic view of a buffer tank and a stirring tank
In the figure: 1. ball mill, 2, spiral classifier, 3, cyclone, 4, ball mill, 5, cyclone pump pool, 6, buffer box, 7, stirring barrel, 8, flotation machine, 10, buffer box feed inlet, 11, an inner inclined buffer layer, 12, a buffer box discharge hole, 13, a stirring motor rotating in a stirring barrel, 14, a stirring motor rotating outside the stirring barrel, 15, a stirring barrel feed box, 16 and a stirring barrel discharge hole.
The specific embodiment is as follows:
In order to enhance the understanding of the present invention, the present embodiment will be described in detail with reference to the accompanying drawings.
Example 1: referring to fig. 1, a process for improving the precision of a desulfurized iron rough concentrate, the process comprising the steps of: the feeding grinding adopts two sections of closed-circuit continuous grinding, the grinding is carried out by a first section of ball mill, then the grinding is graded by a spiral grading machine, the return sand of the grading machine returns to the first section of ball mill, the overflow of the grading machine is fed into a second section of cyclone pump pool,
Feeding the cyclone to the cyclone pump for classification, feeding the underflow of the cyclone to the second-stage ball mill for secondary grinding,
The ore pulp is fed into a cyclone for classification again through a cyclone pump after ore grinding, the overflow of the cyclone is fed into an ore pulp buffer box for collecting and buffering, then the ore pulp, xanthate and oil are fed into a stirring barrel through a pipeline, the ore pulp, xanthate and oil are fully stirred in the stirring barrel and then enter a roughing operation, roughing foam is subjected to three concentration operations, the concentration foam returns to the previous stage for reselection, and the concentration underflow is sulfur concentrate which is the raw material for preparing sulfuric acid;
the scavenging underflow is desulfurized iron concentrate, the iron concentrate is obtained after the separation of the process of lowering phosphorus in the downlink, and if the index is unqualified, the sulfur content is returned to the coarse separation and then the screening is continued.
In the steps, the mill 1 is connected with the spiral classifier 2, the spiral classifier 2 is connected with the cyclone 3, the cyclone 3 is connected with the ball mill 4, the ball mill 4 is connected with the cyclone pump pool 5, the outlet of the cyclone pump pool 5 is connected with the buffer box 6, the outlet of the buffer box 6 is connected with the stirring barrel 7, and the outlet of the stirring barrel 7 is connected with the flotation machine 8.
The buffer tank has 4 buffer tank feed inlets 10, and four series of swirler discharge gates are connected respectively to buffer tank feed inlet 10, and buffer tank inside increases interior oblique buffer layer 11 and realizes reducing former ore deposit feed rate, stops mineral aggregate to pile up, buffer tank discharge gate 12 links to each other with the agitator.
The discharge hole 12 of the buffer box is required to be positioned at the position (the lower edge of the pipe orifice) of more than 20cm below the bottom of the buffer box, the height of the stirring barrel and the overflow pipe of the flotation machine is reduced by 0.5-0.6m, the ore deposit of the stirring barrel is reduced, and the discharge hole 12 of the buffer box is connected with a pipeline for useAnd (5) a wear-resistant pipe.
The agitator comprises agitator internal rotation agitator motor 13, agitator external rotation agitator motor 14, agitator workbin 15, agitator discharge gate 16, agitator internal rotation agitator motor 13 is at the agitator top, agitator external rotation agitator motor 14 is in the agitator lateral part, agitator external rotation agitator motor 14 realizes controlling rotatory stirring, agitator internal rotation agitator motor 13 realizes middle stirring, two agitator motor work just have formed two-way spiral agitator, make former ore deposit and medicament intensive mixing reaction.
The height of the discharge hole 16 of the stirring barrel and the overflow pipe of the flotation machine is reduced by 0.5-0.6m, so that the ore deposit of the stirring barrel is reduced.
Working principle and process: referring to fig. 1, an ore pulp buffer tank is added between a cyclone and a stirring barrel, as shown in fig. 4, the buffer tank is provided with 4 buffer tank feed inlets 10, the buffer tank feed inlets 10 are respectively connected with four series of cyclone discharge outlets, an inner inclined buffer layer 11 is added in the buffer tank to reduce raw ore feeding speed, mineral aggregate accumulation is avoided, the buffer tank discharge outlet 12 is connected with the stirring barrel, the buffer tank discharge outlet 12 is required to be positioned at a position (pipe orifice lower edge) of 20cm above the lower bottom of the buffer tank, meanwhile, the height of the overflow pipe of the flotation machine between the stirring barrel and the stirring barrel is reduced by 0.5-0.6m, the ore deposit of the stirring barrel is reduced, and the buffer tank discharge outlet 12 is connected with a pipelineAnd (5) a wear-resistant pipe.
The agitator comprises agitator internal rotation agitator motor 13, agitator external rotation agitator motor 14, agitator workbin 15, agitator discharge gate 16, agitator internal rotation agitator motor 13 is at the agitator top, agitator external rotation agitator motor 14 is in the agitator lateral part, agitator external rotation agitator motor 14 realizes the rotatory stirring of controlling, agitator internal rotation agitator motor 13 realizes middle stirring, two agitator motor work just have formed two-way spiral agitator, make former ore deposit and medicament intensive mixing reaction. The height of the discharge hole 16 of the stirring barrel and the overflow pipe of the flotation machine is reduced by 0.5-0.6m, so that the ore deposit of the stirring barrel is reduced.
As shown in fig. 1: four series flotation machines are arranged on desulfurization process equipment, the flotation machines are equipment for directly completing a flotation process and are mainly used for desulfurization in production, ore entering and grinding are carried out by adopting two sections of closed-circuit continuous ore grinding, ore grinding is carried out by a first section of ball mill, grading is carried out by a spiral grading machine, sand returning of the grading machine returns to the first section of ball mill, overflow of the grading machine is fed into a second section of cyclone pump pool, grading is carried out by a cyclone pump, underflow of the cyclone is fed into the second section of ball mill for secondary ore grinding, ore pulp is fed into the cyclone pump again for grading, overflow of the cyclone is fed into an ore pulp buffer box for collecting and buffering, then the ore pulp, yellow powder and No. 2 oil are fully stirred in the stirring barrel and enter roughing operation, roughing foam is subjected to three-time concentration operation, concentration foam returns to the previous stage for recleaning, concentration underflow is sulfur concentrate, and sulfur concentrate is a raw material for producing sulfuric acid. The scavenging underflow is the desulfurized iron ore concentrate, and the desulfurized iron ore concentrate is separated by the process of lowering phosphorus in a downlink.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and equivalent changes or substitutions made on the basis of the above-mentioned technical solutions fall within the scope of the present invention as defined in the claims.
Claims (2)
1. The process method for improving the precision of the desulfurized iron rough concentrate is characterized by comprising the following steps of:
The feeding grinding adopts two sections of closed-circuit continuous grinding, the grinding is carried out by a first section of ball mill, then the grinding is graded by a spiral grading machine, the return sand of the grading machine returns to the first section of ball mill, the overflow of the grading machine is fed into a second section of cyclone pump pool,
Feeding the ore pulp into a cyclone pump for classification, feeding the underflow of the cyclone into a second-stage ball mill for secondary ore grinding, feeding the ore pulp into the cyclone pump for classification again after ore grinding, feeding the overflow of the cyclone into an ore pulp buffer box for summarizing and buffering, feeding the ore pulp, xanthate and oil into a stirring barrel through a pipeline, fully stirring the ore pulp, the xanthate and the oil in the stirring barrel, feeding the roughing operation, carrying out three concentration operations on roughing foam, returning the concentration foam to the upper stage for reselection, and collecting the underflow which is the raw material for preparing sulfuric acid;
The scavenging underflow is desulfurized iron concentrate, the iron concentrate is selected by a downlink phosphorus reduction process, and if the index is unqualified, the sulfur content is returned to the coarse selection and then the screening is continued;
In the steps, a first-stage ball mill is connected with a spiral classifier, the spiral classifier is connected with a cyclone, the cyclone is connected with a second-stage ball mill, the second-stage ball mill is connected with a second-stage cyclone pump pool, an outlet of the second-stage cyclone pump pool is connected with a buffer box, an outlet of the buffer box is connected with a stirring barrel, and an outlet of the stirring barrel is connected with a flotation machine;
The buffer tank is provided with 4 buffer tank feed inlets which are respectively connected with four series of cyclone discharge outlets, an inner inclined buffer layer is added in the buffer tank, the buffer tank discharge outlets are connected with the stirring barrel,
The lower edge of the pipe orifice of the discharge hole of the buffer box is required to be positioned at the position of more than 20cm below the buffer box, the height of the overflow pipe of the stirring barrel and the flotation machine is reduced by 0.5-0.6m, the phi 500mm abrasion-resistant pipe is used for the discharge hole connecting pipeline of the buffer box, the stirring barrel is composed of a rotary stirring motor in the stirring barrel, a rotary stirring motor outside the stirring barrel, a stirring barrel feed box and a stirring barrel discharge hole, the rotary stirring motor in the stirring barrel is positioned at the top of the stirring barrel, the rotary stirring motor outside the stirring barrel is positioned at the side part of the stirring barrel, the rotary stirring motor outside the stirring barrel realizes left-right rotary stirring, the rotary stirring motor inside the stirring barrel realizes middle stirring, and two stirring motors work to form a bidirectional spiral stirring barrel, so that raw ore and medicament are fully stirred and reacted.
2. The process for improving the precision of the desulfurized iron rough concentrate according to claim 1, wherein the heights of the discharge port of the stirring barrel and the overflow pipe of the flotation machine are reduced by 0.5-0.6m.
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| CN112973951B true CN112973951B (en) | 2024-05-17 |
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| CN110201790A (en) * | 2019-06-21 | 2019-09-06 | 中国矿业大学 | A kind of the sorting recovery system and sorting recovery process of width grade coal slime |
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| MX2007007191A (en) * | 2006-06-19 | 2009-02-18 | Daniel Zvonimir Urizar Funes | Process for concentrating hydrophobic materials by flotation, which comprises two devices operating in series. |
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- 2019-12-13 CN CN201911276657.XA patent/CN112973951B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101733190A (en) * | 2008-11-25 | 2010-06-16 | 宝钢集团上海梅山有限公司 | Benefication method for sulphur-containing composite iron tailing |
| CN101549322A (en) * | 2009-05-13 | 2009-10-07 | 昆明理工大学 | Process of using sulphur lead-zinc containing tailings to prepare sulphur iron ore concentrate |
| CN102327816A (en) * | 2011-09-30 | 2012-01-25 | 昆明川金诺化工股份有限公司 | Method by utilizing sulfuric-acid residue to produce iron concentrates |
| CN105498981A (en) * | 2016-02-23 | 2016-04-20 | 中国矿业大学 | High-carbon coal ash flotation and carbon removal technology with foam stabilizing characteristic |
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