CN105498929A - Magnetite concentrate quality-improving and impurity-reducing technology and device - Google Patents
Magnetite concentrate quality-improving and impurity-reducing technology and device Download PDFInfo
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- CN105498929A CN105498929A CN201610009784.3A CN201610009784A CN105498929A CN 105498929 A CN105498929 A CN 105498929A CN 201610009784 A CN201610009784 A CN 201610009784A CN 105498929 A CN105498929 A CN 105498929A
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- ore
- hydrocyclone
- ore pulp
- pulp
- magnetite concentrate
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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
- B02C21/00—Disintegrating plant with or without drying of the material
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a magnetite concentrate quality-improving and impurity-reducing technology and device. The technology comprises the following specific steps that firstly, a vertical spiral stirring ore grinding machine is used for carrying out wet grinding on coarse concentrate particles with the grade lower than or equal to 60%, and primary ore pulp is obtained after grinding is carried out for a period of time; secondly, the primary ore pulp is discharged into an ore pulp pool and pumped into a hydrocyclone through a slurry pump, the primary ore pulp is classified through the hydrocyclone, the classified settled sand (at a coarse fraction) is subjected to the second step again, and secondary ore pulp (at a fine fraction) overflows; thirdly, the secondary ore pulp enters a cylindrical magnetic extractor, and iron ore concentrate with the iron-containing grade higher than 63.5% is obtained. According to the magnetite concentrate quality-improving and impurity reducing technology, the steps are orderly linked, the existing low-grade coarse concentrate is ground, subjected to closed-loop classification and magnetic sorting, the iron-containing grade of the magnetite concentrate is increased to 63.5% or above from 60% or lower, and the content of silicon and aluminum impurities is effectively reduced.
Description
Technical field
The invention belongs to ore dressing (minerals separation) technology field, particularly relate to a kind of magnetite concentrate upgrading and fall general labourer's skill and device.
Background technology
Certain of our company selects the former design production scale of factory to be 1,000,000 tons/year, the magnetic iron ore of former design treatment high-grade, the thick disseminated grain size of magnetic iron ore crystallization, and its design cycle is coarse crushing-oneself, ball milling two sections of Stage grinding separation technology flow processs.Due to some odjective causes, this selects factory then process is low-grade, the mixed ore of magnetic iron ore crystallographic fine-grained disseminated grain, the adaptability of autogenous tumbling mill to different hardness, grindability ore of this process system is poor, cause system raw ore disposal ability on a declining curve, produce magnetite concentrate ferrous grade by more than 64%, drop to less than 60%, cannot meet the requirement of user to magnetite concentrate quality.At present, for this situation, domestic appearance, to the technological improvement of existing technique, specifically comprises:
Paper name is called " optimize the upgrading of East Anshan magnetic separation rough concentrate with dispersant NM-1 and fall general labourer's skill " (metal mine, 2013, (9) describing in document: 60-63) with NM-1 is the dispersant of microfine siderite, the research of single reverse floatation process is carried out to magnetic separation rough concentrate, iron concentrate grade 66.37% can have been obtained, the rate of recovery has been 75%; For another example Chinese invention patent name is called that " general labourer's skill falls in magnetite concentrate upgrading " (publication number is CN103977882A) discloses a kind of magnetite concentrate upgrading and fall general labourer's skill, and ore selects through broken, mill and carries out filtration after reverse flotation and obtains concentrate; Wherein, reverse flotation is the mode that a thick essence three is swept, and reverse flotation adopts HL02 anion as collecting agent, and starch is as inhibitor, and CaO is as activator, and PH adjusting agent is NaOH.Problems existing is, flotation operation technological process is complicated, and floating agent consumption is large costly, complex operation, equipment and capital expenditure high, and flotation needs to use various medicament, not only contaminated environment, also to prepare medicament, add beneficiation cost, the health of medicament infringement operator.
Paper name is called " Baogang ore dressing plant adopts Fine screening-regrinding technology upgrading to fall assorted commerical test " (national ore dressing new technologies in 2004 and developing direction scientific seminar thereof and technical conferences collection of thesis, record in document 2004:358-360), Baogang ore dressing plant adopts MVS high frequency vibrating screen to replace one section of cyclone to carry out upgrading and fall assorted commerical test, result confirms, when material condition is substantially identical, adopt Fine screening-regrinding technology, iron concentrate grade of regrinding can improve more than 1 percentage point, and in iron ore concentrate, impurity content decreases.But when process accounts for the material of more than 80% containing 0.074mm, the screening efficiency of high frequency fine screen is very low, generally lower than 30%, more much lower than the classification efficiency of hydrocyclone.
Summary of the invention
In order to overcome the defect of prior art, the object of this invention is to provide a kind of magnetite concentrate upgrading and fall general labourer's skill, when guaranteeing that raw ore disposal ability is not less than 1,000,000 tons/year, improving and selecting more than the magnetite concentrate grade to 63.5% of factory, reduce ore grinding cost, reduce environmental pollution.
General labourer's skill falls in a kind of magnetite concentrate upgrading, comprises following concrete steps:
(1) wet lapping: adopt high-efficiency vertical auger ore mill to carry out wet grinding to the rough concentrate stone granulate that grade accounts for 60% ~ 75% less than or equal to 60% ,-200 orders, milling medium adopts
minor diameter steel ball, volume pack completeness 55% ~ 65%, grinding machine adopts continuous-feeding, feeding coal is butt 30t/h ~ 50t/h, to ore deposit concentration expressed in percentage by weight 40% ~ 60%, agitating auger rotating speed controls as 30r/min ~ 50r/min, and obtain an ore pulp after grinding a period of time, pulp density controls 40% ~ 60%;
(2) scalping: be disposed in slime dam by an ore pulp, is raised by Pulp pump and gives into hydrocyclone, and conveying capacity is 200m
3/ h ~ 600m
3/ h, hydrocyclone carries out classification to an ore pulp, and classification sand setting gets back to above-mentioned steps (1), overflows secondary ore pulp;
(3) the weak magnetic separation of secondary ore pulp: the secondary ore pulp that step (2) obtains enters permanent-magnetic cylindrical magnetic separator, cylinder rotation rate controls as 15r/min ~ 25r/min, and carry out low intensity magnetic separation, obtaining grade is the iron ore concentrate of more than 63.5%.
Further, described in step (1), the optimum gradation of steel ball is:
30%,
40%,
30%, steel ball grating is reasonable, and with material fit, the grinding efficiency of material is high.
Further, in step (1), rough concentrate stone granulate milling time is 5 ~ 6min.
Further, pulp density described in step (1) is lower more reasonable, should be lower concentration and be conducive to ore particle in grinding machine by proportion, granular size classification of sedimentation, improve selective milling effect, be conducive to the liberation degree of minerals improving grinding charge material, obtain better upgrading and fall assorted effect.
Further, in secondary ore pulp described in step (2), release mesh controls at-200 order content is more than 95%, to guarantee weak magnetic separation effect, improves production efficiency simultaneously.
Another object of the present invention is to provide a kind of magnetite concentrate upgrading and falls assorted device, comprise vertical helical ore grinding mixer, slime dam, hydrocyclone, barrel magnetic separator, ore pulp efferent duct, the first carrier pipe, sand setting return duct, discharger and a Pulp pump, described vertical helical ore grinding mixer has charging aperture, discharging opening and water inlet; Described hydrocyclone has stock inlet, refluxing opening and overfall; Described ore pulp efferent duct two ends are connected with the discharging opening of vertical helical ore grinding mixer, the middle part of slime dam respectively; The first described carrier pipe is provided with Pulp pump, and the first carrier pipe two ends are connected with the bottom of slime dam, the stock inlet of hydrocyclone respectively; Described sand setting return duct two ends are connected with the refluxing opening of hydrocyclone, the charging aperture of vertical helical ore grinding mixer respectively, form closed cycle; Described discharger is connected with the overfall of hydrocyclone, barrel magnetic separator respectively.
Further, this device also comprises circulating water pipe and is arranged on the pump of described circulating water pipe, and described circulating water pipe one end is connected to described slime dam, and the other end is connected to the water inlet of described vertical helical ore grinding mixer.
Further, described vertical helical ore grinding mixer is JM type vertical spiral agitating mill.
Compared with prior art, the invention has the beneficial effects as follows:
1) general labourer's skill falls in upgrading of the present invention, step is connected in order, by existing low-grade rough concentrate by grinding, classification and magnetic separation, improve magnetite concentrate grade, be promoted to more than 63.5% by less than 60%, effectively reduce the objectionable impurities content such as silicon, aluminium, phosphorus, sulphur;
2) upgrading of the present invention falls general labourer's skill simply, and process unit structure is simple, convenient operating maintenance, and floor space is little;
3) device energy-conserving and environment-protective of the present invention, vertical spiral agitating mill compares energy-conservation more than 50%, compared with floatation process than horizontal ball mill, without the need to adding chemical agent, can significantly reduce ore grinding cost, non-environmental-pollution, reduce the damage to person of operator.
Accompanying drawing explanation
Fig. 1 is the structural representation that assorted device falls in magnetite concentrate upgrading of the present invention.
Detailed description of the invention
The rough concentrate stone that the present invention obtains for the mining production of company, in conjunction with the embodiments to the present invention's row detailed description further.
As shown in Figure 1, the invention provides a kind of magnetite concentrate upgrading and fall assorted device, comprise vertical helical ore grinding mixer 5, slime dam 1, hydrocyclone 7, barrel magnetic separator 9, ore pulp efferent duct 3, first carrier pipe 10, sand setting return duct 6, discharger 8 and a Pulp pump 11, described vertical helical ore grinding mixer has charging aperture, discharging opening and water inlet; Described hydrocyclone has stock inlet, refluxing opening and overfall; Described ore pulp efferent duct two ends are connected with the discharging opening of vertical helical ore grinding mixer, the middle part of slime dam respectively; The first described carrier pipe is provided with Pulp pump, and the first carrier pipe two ends are connected with the bottom of slime dam, the stock inlet of hydrocyclone respectively; Described sand setting return duct two ends are connected with the refluxing opening of hydrocyclone, the charging aperture of vertical helical ore grinding mixer respectively, form closed cycle; Described discharger is connected with the overfall of hydrocyclone, barrel magnetic separator respectively.
Further, this device also comprises circulating water pipe 4 and is arranged on the pump 2 of described circulating water pipe, and described circulating water pipe one end is connected to described slime dam 1, and the other end is connected to the water inlet of described vertical helical ore grinding mixer 5.
On the basis of said apparatus, general labourer's skill falls in a kind of magnetite concentrate upgrading of the present invention, comprises following concrete steps:
(1) wet lapping: adopt vertical helical ore grinding mixer to carry out wet lapping to the rough concentrate stone granulate that grade accounts for 60% ~ 75% less than or equal to 60% ,-200 orders, steel ball volume pack completeness 60%, grinding machine adopts continuous-feeding, feeding coal is butt 40t/h, to ore deposit concentration expressed in percentage by weight 50%, agitating auger rotating speed controls as 40r/min, and obtain an ore pulp after grinding a period of time, pulp density controls 50%;
(2) scalping: be disposed in slime dam by an ore pulp, delivers to hydrocyclone by Pulp pump by an ore slurry pump, and conveying capacity is 500m
3/ h, hydrocyclone carries out classification to an ore pulp, and classification sand setting gets back to above-mentioned steps (1), overflows secondary ore pulp;
(3) secondary grading: secondary ore pulp enters barrel magnetic separator, drum rotation speed controls as 20r/min, carries out low intensity magnetic separation, obtain grade higher than 63.5% iron ore concentrate.
Described in step (1), the optimum gradation of steel ball is:
30%,
40%,
30%, steel ball grating is reasonable, and with material fit, the grinding efficiency of material is high.
In step (1), rough concentrate stone granulate milling time is 5 ~ 6min.Described vertical helical ore grinding mixer 5 is JM type vertical helical ore grinding mixer, and its power of motor 215Kw, ore milling concentration is 50%, and milling medium is
steel ball, ore milling product granularity sees the following form 1.
The different ore grinding time is that-200 orders are containing scale 1
| Ore grinding time min | 0 | 2 | 4 | 6 | 8 | 10 |
| -200 order content | 69.86 | 85.94 | 92.66 | 95.73 | 97.83 | 98.72 |
Different ore grinding time granularity curve is obtained, See Figure according to table 1:
As can be seen from the figure: when the ore grinding time is 5.5min ,-200 order content account for 95%.
In secondary ore pulp described in step (2), particle release mesh controls at-200 order content is more than 95%, and classification sand setting amount is few, effectively ensures the grading effect of hydrocyclone, improves production efficiency simultaneously.
Claims (8)
1. general labourer's skill falls in magnetite concentrate upgrading, it is characterized in that, comprises following concrete steps:
(1) wet lapping: adopt vertical helical ore grinding mixer to carry out wet lapping to the rough concentrate stone granulate that grade accounts for 60% ~ 75% less than or equal to 60% ,-200 orders, milling medium adopts
minor diameter steel ball, volume pack completeness 55% ~ 65%, grinding machine adopts continuous-feeding, feeding coal is butt 30t/h ~ 50t/h, to ore deposit concentration expressed in percentage by weight 40% ~ 60%, agitating auger rotating speed controls as 30r/min ~ 50r/min, and obtain an ore pulp after grinding a period of time, pulp density controls 40% ~ 60%;
(2) scalping: be disposed in slime dam by an ore pulp, delivers to hydrocyclone by Pulp pump by an ore slurry pump, and conveying capacity is 200m
3/ h ~ 600m
3/ h, hydrocyclone carries out classification to an ore pulp, and classification sand setting gets back to above-mentioned steps (1), overflows secondary ore pulp;
(3) secondary grading: secondary ore pulp enters drum magnetic separator, cylinder rotation rate controls, for 15r/min ~ 25r/min, to carry out low intensity magnetic separation, obtain the iron ore concentrate of grade more than 63.5%.
2. general labourer's skill falls in magnetite concentrate upgrading according to claim 1, it is characterized in that, described in step (1), the grating of steel ball is:
3. general labourer's skill falls in magnetite concentrate upgrading according to claim 1, it is characterized in that, in step (1), rough concentrate stone granulate milling time is 5 ~ 6min.
4. general labourer's skill falls in magnetite concentrate upgrading according to claim 1, it is characterized in that, the grind grading circulation described in step (1).
5. general labourer's skill falls in magnetite concentrate upgrading according to claim 1, it is characterized in that, in secondary ore pulp described in step (2), particle release mesh controls at-200 order content is more than 95%.
6. assorted device falls in a magnetite concentrate upgrading, it is characterized in that, comprise vertical helical ore grinding mixer (5), slime dam (1), hydrocyclone (7), barrel magnetic separator (9), ore pulp efferent duct (3), the first carrier pipe (10), sand setting return duct (6), discharger (8) and a Pulp pump (11), described vertical helical ore grinding mixer has charging aperture, discharging opening and water inlet; Described hydrocyclone has stock inlet, refluxing opening and overfall; Described ore pulp efferent duct two ends are connected with the discharging opening of vertical helical ore grinding mixer, the middle part of slime dam respectively; The first described carrier pipe is provided with Pulp pump, and the first carrier pipe two ends are connected with the bottom of slime dam, the stock inlet of hydrocyclone respectively; Described sand setting return duct two ends are connected with the refluxing opening of hydrocyclone, the charging aperture of vertical helical ore grinding mixer respectively, form closed cycle; Described discharger is connected with the overfall of hydrocyclone, barrel magnetic separator respectively.
7. assorted device falls in magnetite concentrate upgrading according to claim 6, it is characterized in that, this device also comprises circulating water pipe (4) and is arranged on the pump (2) of described circulating water pipe, described circulating water pipe one end is connected to described slime dam, and the other end is connected to the water inlet of described vertical helical ore grinding mixer (5).
8. assorted device falls in magnetite concentrate upgrading according to claim 6, it is characterized in that, described vertical helical ore grinding mixer (5) is JM type vertical helical ore grinding mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009784.3A CN105498929A (en) | 2016-01-05 | 2016-01-05 | Magnetite concentrate quality-improving and impurity-reducing technology and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009784.3A CN105498929A (en) | 2016-01-05 | 2016-01-05 | Magnetite concentrate quality-improving and impurity-reducing technology and device |
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| CN105498929A true CN105498929A (en) | 2016-04-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107262224A (en) * | 2017-07-31 | 2017-10-20 | 长沙矿冶研究院有限责任公司 | A kind of zinc oxygen leaching method for preparing raw material and two sections of vertical stirring mill series connection open-circuit grinding systems |
| CN107812590A (en) * | 2016-09-14 | 2018-03-20 | 中国地质科学院矿产综合利用研究所 | Selective dissociation strengthening separation method for fine particles difficult to separate |
| CN109261042A (en) * | 2017-07-17 | 2019-01-25 | 识骅科技股份有限公司 | Formed uniform carbon nanotubes electrocondution slurry method and applied process unit |
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| CN107812590A (en) * | 2016-09-14 | 2018-03-20 | 中国地质科学院矿产综合利用研究所 | Selective dissociation strengthening separation method for fine particles difficult to separate |
| CN109261042A (en) * | 2017-07-17 | 2019-01-25 | 识骅科技股份有限公司 | Formed uniform carbon nanotubes electrocondution slurry method and applied process unit |
| CN109261042B (en) * | 2017-07-17 | 2021-12-10 | 芯量科技股份有限公司 | Method for forming uniform carbon nanotube conductive paste and applied process device |
| CN107262224A (en) * | 2017-07-31 | 2017-10-20 | 长沙矿冶研究院有限责任公司 | A kind of zinc oxygen leaching method for preparing raw material and two sections of vertical stirring mill series connection open-circuit grinding systems |
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