CN107413490B - A kind of method of phosphorus, iron and titanium mineral in synthetical recovery magmatic phosphate deposit - Google Patents

A kind of method of phosphorus, iron and titanium mineral in synthetical recovery magmatic phosphate deposit Download PDF

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CN107413490B
CN107413490B CN201710413445.6A CN201710413445A CN107413490B CN 107413490 B CN107413490 B CN 107413490B CN 201710413445 A CN201710413445 A CN 201710413445A CN 107413490 B CN107413490 B CN 107413490B
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phosphorus
ore
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CN107413490A (en
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韩跃新
李艳军
郭文达
朱民
朱一民
刘杰
吕良
高鹏
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Northeastern University China
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00Disintegrating plant with or without drying of the material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/001Flotation agents

Abstract

The raw ore of Magmatic Phosphorus ore is carried out coarse crushing in sequentially including the following steps: (1) by a kind of method of phosphorus, iron and titanium mineral in synthetical recovery magmatic phosphate deposit;(2) rear screening fine crushing is carried out;(3) mine fine crushing one section of ball mill is fed to roughly grind;(4) one section of overflow product is subjected to the direct flotation that thick three essence two is swept;Concentrate selection top-up as phosphorus concentrate;(5) by two sections of fine grindings of flotation tailing, hydrocyclone isolates two sections of overflow products;(6) two sections of overflow products are subjected to two sections of low intensity magnetic separations;(7) whole low intensity magnetic separation tailings that two sections of low intensity magnetic separations obtain are fed into Ball-stirring mill and carries out Ultrafine Grinding;(8) two sections of high intensity magnetic separations of row will be carried out by overflow product three times.Flotation circuit does not need NaCO in the present invention3Regulator;Dissociation granularity according to different minerals in ore is different, carries out stage grinding, substep dissociation, in time sorting, to avoid that mineral are overground, argillization, solves in actual production the problems such as rate of recovery is low, high production cost, yield is small, need to be dehydrated, desliming.

Description

A kind of method of phosphorus, iron and titanium mineral in synthetical recovery magmatic phosphate deposit
Technical field
The invention belongs to technical field of mineral processing, in particular to phosphorus in a kind of synthetical recovery magmatic phosphate deposit, iron and The method of titanium mineral.
Background technique
Phosphorus ore is a kind of important industrial or agricultural raw mineral materials, is mainly distributed on the southern provinces and cities such as cloud, expensive, river.With phosphate fertilizer The development of industry, Chinese phosphorus ore demand are increasing;It is estimated that the rich phosphorus ore (P of China2O5> 30%) 11.2 hundred million t of reserves, accounts for The 22.5% of gross reserves will be exploited after 10 years and be exhausted;The most of rocks phosphate in powder in China belong to mid low grade phosphate rock, using preceding necessary It could be used by related phosphorus chemical industry by beneficiation enrichment.
Southern phosphorus ore head grade is higher, but the collophane that mostly fine size, embedding cloth are close, objectionable impurities content is high, no Easily separated, ore dressing difficulty is big.There are the phosphorous magma lithotype ore of larger reserves, P in North China and the Northwest2O5Grade down to 2 ~ 5%, Often containing mineral such as Fe, Ti, V and rare earths in this type mine.The mineral such as iron, titanium, tailing are selected in usual such preferential magnetic separation of ore There is 3 ~ 6% or so P in the middle2O5, the phosphate rock floating in this tailing is recycled in part selected scenes, as ore dressing by-product.With south Cost pressure caused by the long range great number freight charges that phosphorus north fortune, Xi Lindong are transported is increasing, this Magmatic Phosphorus ore resource With huge potential value.
Apatite is in Magmatic Phosphorus ore with idiomorphism column, granular output, and granularity is based on the embedding cloth of coarse grain;Iron, titanium etc. For metalliferous mineral based on middle fine-grained disseminated grain, granularity is uneven, and wherein titaniferous ore disseminated grain size is superfine;Since the ore usually contains There are a certain amount of magnetic iron ore TFe grade 8 ~ 15%, big multiselect factory (such as river steel Bai Quan iron ore, Hebei treasured lead to mining industry etc.) magnetic first Select magnetic iron ore, flotation recovery apatite after tailing desliming concentration;Since the disseminated grain size of iron is thinner, and Relative grindability compared with Height, in the case where being suitable for the grinding condition for selecting iron, there are serious argillizations, overground phenomenon for apatite in ore, and tailings concentration is low, it is necessary to It just can enter flotation by techniques such as desliming, concentrations;Sort that difficulty is big, treating capacity is small, phosphorus loss is serious, returns so as to cause flotation The problems such as yield is low;In addition, there are TiO in ore2The ilmenite of content 2 ~ 5% is not recycled;Therefore, for such Ore research and develop it is a kind of can synthetical recovery phosphorus, iron, titanium mineral efficient mineral separation process, have huge economic value and reality meaning Justice.
Summary of the invention
For existing iron content, titanium, phosphorus magma lithotype ore " phosphorus after first iron " grder man's technique existing for problems, this Invention provides a kind of method of phosphorus, iron and titanium mineral in synthetical recovery magmatic phosphate deposit, according to phosphorus, iron, titanium mineral difference solution From granularity and embedding cloth feature, " first phosphorus again iron after titanium " ore dressing synthetical recovery operation of substep dissociation, stage choosing is carried out, mineral are avoided While overground, argillization phenomenon, shortens production procedure and simultaneously increase treating capacity.
The method of the present invention includes the following steps:
1, the raw ore of Magmatic Phosphorus ore is subjected to coarse crushing, until granularity 30mm ~ 50mm, obtains coarse crushing mine;
2, coarse crushing mine is subjected to fine crushing and then screening, screen size when screening is 2 ~ 5mm, obtains the mine fine crushing under sieve;
3, mine fine crushing is fed one section of ball mill to roughly grind, ore grinding pulp density 50 ~ 70%, and with spiral classifier into Row classification, the fineness for obtaining one section of overflow product is 0.074 ~ 0.15mm;
4, one section of overflow product is subjected to the direct flotation that thick three essence two is swept;Roughing regime of agent are as follows: to raw ore mine-supplying quantity, Waterglass dosage is 400 ~ 800g/t, and collector dosage is 800 ~ 1200g/t, and roughing pulp pH value 7 ~ 8, ore pulp quality are dense at this time Degree 30 ~ 40%;The rougher concentration that roughing obtains carries out triple cleaning and obtains phosphorus concentrate, selected regime of agent are as follows: to raw ore to mine Amount, each selected waterglass dosage are 100 ~ 200g/t;The rougher tailings that roughing obtains is scanned to obtain flotation tailing twice, Scan regime of agent are as follows: to raw ore mine-supplying quantity, scan 200 ~ 300g/t of collector dosage every time;Each selected tailing is scanned Concentrate successively return to previous step flotation circuit;Flotation concentrate and flotation tailing are obtained after direct flotation;Wherein direct flotation essence Mine is as phosphorus concentrate;
5, flotation tailing is fed into two sections of ball mills and carries out fine grindings, and with hydrocyclone isolate granularity be 0.038 ~ Two sections of overflow products of 0.045mm;
6, two sections of overflow products are subjected to two sections of low intensity magnetic separations;Magnetic field strength 800Oe ~ 1000Oe when first segment low intensity magnetic separation, the One section of weak magnetic concentrate selection that one section of low intensity magnetic separation obtains carries out second segment low intensity magnetic separation, and magnetic field strength 1000Oe when second segment low intensity magnetic separation ~ 1500Oe, two sections of weak magnetic concentrate selections that second segment low intensity magnetic separation obtains are as iron ore concentrate;
7, whole low intensity magnetic separation tailings that two sections of low intensity magnetic separations obtain are fed into Ball-stirring mill and carries out Ultrafine Grinding, and use hydrocyclone Isolate three sections of overflow products of 0.015 ~ 0.025mm;
8, three sections of overflow products are subjected to two sections of high intensity magnetic separations of row, one section of high intensity magnetic separation concentrate that first segment high intensity magnetic separation obtains carries out Second segment high intensity magnetic separation, two sections of high intensity magnetic separation concentrate that second segment high intensity magnetic separation obtains are as ilmenite concentrate, the magnetic field strength of two sections of high intensity magnetic separations For 3500 ~ 5000Oe, the tailing that two sections of high intensity magnetic separations obtain is as true tailings.
In the above method, the on-the-sieve material that step 2 screening obtains returns to process fine crushing.
In the above method, one section of sand setting of the acquisition after step 3 classification returns to one section of ball mill.
In the above method, the roughing time of step 4 is 4 ~ 6min, the time that is selected and scanning is 2 ~ 3min, flotation temperature 30~40℃。
In the above method, two sections of sand settings that step 5 obtains return to two sections of ball mills.
In the above method, three sections of sand settings that step 7 obtains return to Ball-stirring mill.
P in above-mentioned phosphorus concentrate2O5Grade 31 ~ 36%, P2O5The rate of recovery 75 ~ 90%;TFe grade 64 ~ 67%, Fe in iron ore concentrate The rate of recovery 40 ~ 55%;TiO in ilmenite concentrate2Grade 40 ~ 49%, TiO2The rate of recovery 35 ~ 60%.
Flotation circuit does not need NaCO in the present invention3Regulator;Dissociation granularity according to different minerals in ore is different, into It is low, raw to solve the rate of recovery in actual production to avoid that mineral are overground, argillization for row stage grinding, substep dissociation, in time sorting Produce at high cost, yield is small, need be dehydrated, desliming the problems such as;This is to northern China largely low-grade iron content, titanium, phosphorus magma lithotype The comprehensive utilization of ore has important practical guided significance.
Detailed description of the invention
Fig. 1 is the method stream of phosphorus, iron and titanium mineral in one of embodiment of the present invention 1 synthetical recovery magmatic phosphate deposit Journey schematic diagram;
Fig. 2 is the direct flotation flow diagram that thick three essence two in the embodiment of the present invention 1 is swept.
Specific embodiment
Coarse crushing uses jaw crusher in the embodiment of the present invention.
It is fine crushing in the embodiment of the present invention to use double-roll crusher.
Screening uses high frequency shale shaker in the embodiment of the present invention.
Two sections of low intensity magnetic separations use cartridge type weak magnetic separator in the embodiment of the present invention.
Two sections of high intensity magnetic separations use vertical ring high-gradient intensity magnetic separator in the embodiment of the present invention,
P in magmatic phosphate deposit in the embodiment of the present invention2O5Grade 2 ~ 6%, TFe grade 8 ~ 16%, TiO2Grade 2 ~ 4%.
The present invention will be further described combined with specific embodiments below, but the present invention is originally not limited to following embodiment.
Embodiment 1
Magmatic phosphate deposit comes from the low-grade phosphorous, iron in Chengde, titanium ore;Ingredient (weight percent as shown in table 1 Than);
Table 1
Ingredient P2O5 TFe TiO2 SiO2 Al2O3 CaO MgO
Content/% 2.22 10.31 2.25 44.63 13.90 8.07 4.86
The raw ore of Magmatic Phosphorus ore is subjected to coarse crushing, until granularity 30mm ~ 50mm, obtains coarse crushing mine;
Coarse crushing mine is subjected to fine crushing and then screening, screen size when screening is 3mm, obtains the mine fine crushing under sieve;Screening The on-the-sieve material of acquisition returns to process fine crushing
Mine fine crushing is fed one section of ball mill to roughly grind, ore grinding pulp density 50%, and is divided with spiral classifier Grade, the fineness for obtaining one section of overflow product is 0.074 ~ 0.15mm;One section of sand setting of the acquisition after classification returns to one section of ball mill;
One section of overflow product is subjected to the direct flotation that thick three essence two is swept;Roughing regime of agent are as follows: to raw ore mine-supplying quantity, water Glass dosage is 400g/t, collector dosage 800g/t, at this time roughing pulp pH value 7, ore pulp mass concentration 30%;Roughing obtains The rougher concentration obtained carries out triple cleaning and obtains phosphorus concentrate, selected regime of agent are as follows: to raw ore mine-supplying quantity, each selected waterglass Dosage is 100g/t;The rougher tailings that roughing obtains is scanned to obtain flotation tailing twice, scans regime of agent are as follows: to raw ore Mine-supplying quantity scans collector dosage 200g/t every time;Selected tailing, the concentrate scanned successively return to previous step flotation work every time Sequence;Flotation concentrate and flotation tailing are obtained after direct flotation;Concentrate selection wherein top-up as phosphorus concentrate;The roughing time is 5min, selected and time for scanning are 2min, 30 DEG C of flotation temperature;
Flotation tailing is fed into two sections of ball mills and carries out fine grindings, and with hydrocyclone isolate granularity be 0.038 ~ Two sections of overflow products of 0.045mm;Two sections of sand settings return to two sections of ball mills;
Two sections of overflow products are subjected to two sections of low intensity magnetic separations;Magnetic field strength 950Oe when first segment low intensity magnetic separation, first segment low intensity magnetic separation The one section of weak magnetic concentrate selection obtained carries out second segment low intensity magnetic separation, magnetic field strength 1250Oe when second segment low intensity magnetic separation, second segment weak magnetic Select the two sections of weak magnetic concentrate selections obtained as iron ore concentrate;
Whole low intensity magnetic separation tailings that two sections of low intensity magnetic separations obtain are fed into Ball-stirring mill and carry out Ultrafine Grinding, and are divided with hydrocyclone Separate out three sections of overflow products of 0.015 ~ 0.025mm;Three sections of sand settings return to Ball-stirring mill;
Two sections of high intensity magnetic separations of row will be carried out by overflow product three times, one section of high intensity magnetic separation concentrate that first segment high intensity magnetic separation obtains carries out the Two sections of high intensity magnetic separations, as ilmenite concentrate, the magnetic field strength of two sections of high intensity magnetic separations is two sections of high intensity magnetic separation concentrate that second segment high intensity magnetic separation obtains 3500Oe, the tailing that two sections of high intensity magnetic separations obtain is as true tailings;
P in phosphorus concentrate2O5Grade 31.58%, P2O5The rate of recovery 77.97%;TFe grade 65.69% in iron ore concentrate, the Fe rate of recovery 48.98%;TiO in ilmenite concentrate2Grade 41.95%, TiO2The rate of recovery 36.89%.
Embodiment 2:
With embodiment 1, difference is method:
(1) screen size when sieving is 2mm;Ore grinding pulp density 60%,
(2) roughing regime of agent are as follows: to raw ore mine-supplying quantity, waterglass dosage is 600g/t, collector dosage 1000g/ T, at this time roughing pulp pH value 7.5, ore pulp mass concentration 35%;The rougher concentration that roughing obtains carries out triple cleaning and obtains phosphorus essence Mine, selected regime of agent are as follows: to raw ore mine-supplying quantity, each selected waterglass dosage is 150g/t;The rougher tailings that roughing obtains It is scanned to obtain flotation tailing twice, scans regime of agent are as follows: to raw ore mine-supplying quantity, scan collector dosage 250g/ every time t;
(3) the roughing time is 4min, the time that is selected and scanning is 3min, 35 DEG C of flotation temperature;
(4) magnetic field strength 800Oe when first segment low intensity magnetic separation, magnetic field strength 1000Oe when second segment low intensity magnetic separation;
(5) magnetic field strength of high intensity magnetic separation is 5000Oe twice;
(6) P in phosphorus concentrate2O5Grade 33.80%, P2O5The rate of recovery 81.00%;TFe grade 65.89% in iron ore concentrate, Fe are returned Yield 52.45%;TiO in ilmenite concentrate2Grade 48.1%, TiO2The rate of recovery 56.3%.
Embodiment 3
With embodiment 1, difference is method:
(1) screen size when sieving is 5mm;Ore grinding pulp density 70%,
(2) roughing regime of agent are as follows: to raw ore mine-supplying quantity, waterglass dosage is 800g/t, collector dosage 1200g/ T, at this time roughing pulp pH value 8, ore pulp mass concentration 40%;The rougher concentration that roughing obtains carries out triple cleaning and obtains phosphorus concentrate, Selected regime of agent are as follows: to raw ore mine-supplying quantity, each selected waterglass dosage is 200g/t;The rougher tailings that roughing obtains carries out It scans to obtain flotation tailing twice, scans regime of agent are as follows: to raw ore mine-supplying quantity, scan collector dosage 300g/t every time;
(3) the roughing time is 6min, the time that is selected and scanning is 3min, 40 DEG C of flotation temperature;
(4) magnetic field strength 1000Oe when first segment low intensity magnetic separation, magnetic field strength 1500Oe when second segment low intensity magnetic separation;
(5) magnetic field strength of high intensity magnetic separation is 4000Oe twice;
(6) P in phosphorus concentrate2O5Grade 35.22%, P2O5The rate of recovery 84.00%;TFe grade 66.20% in iron ore concentrate, Fe are returned Yield 56.3%;TiO in ilmenite concentrate2Grade 46.60%, TiO2The rate of recovery 51.90%.
Comparative example 1:
Raw ore is the same as embodiment 1;
Using dressing plant's site technique, i.e. iron is selected in two sections of stage grinding-magnetic separation;Flotation is selected after magnetic tailing dehydration, desliming Phosphorus;Ilmenite does not carry out recycling operation.
(1) raw ore is subjected to coarse crushing to 50mm or less with jaw crusher;
(2) coarse crushing product is carried out with double-roll crusher fine crushing, and it is below fine crushing with high frequency shale shaker to screen out 3mm Mine;
(3) mine fine crushing is fed into one section of ball mill, ore grinding pulp density 50%, and is classified with spiral classifier, one section Overflow product fineness is that -0.074mm content accounts for 70%;
(4) one section of overflow product is subjected to a stages of magnetic separation and throws tail, magnetic field strength 950Oe, magnetic concentrate carries out secondary grinding Classification, secondary grinding graded product fineness are that -0.045mm content accounts for 80%;
(5) by grind grading product at magnetic field strength 1250Oe, iron ore concentrate, gained iron ore concentrate TFe grade are selected in magnetic separation 65.21%, the rate of recovery 47.03%;
(6) magnetic tailing of step (4) and step (5) is merged, is dehydrated, desliming makes ore pulp mass concentration 30%, Carry out the one thick three single-minded direct flotation process swept, 30 DEG C of flotation temperature, roughing waterglass dosage 400g/t, collector dosage 800g/t, slurry pH 7(ore pulp natural ph), selected waterglass dosage 100g/t scans collector dosage 200g/t, obtains Phosphorus concentrate product and tailing, gained phosphorus concentrate P2O5Grade is 30.74%, the rate of recovery 70.41%.
Through embodiment 1 compared with comparative example 1 it is found that under same operation parameter, technique of the invention is compared to scene Production technology is avoided that the phenomenon that leading to overground phosphorus ore, argillization because of secondary grinding, and optimization sorts environment, each element rate of recovery and product Position is significantly improved.

Claims (7)

1. a kind of method of phosphorus, iron and titanium mineral in synthetical recovery Magmatic Phosphorus ore, it is characterised in that according to the following steps into Row:
(1) raw ore of Magmatic Phosphorus ore is subjected to coarse crushing, until granularity 30mm ~ 50mm, obtains coarse crushing mine;
(2) coarse crushing mine is subjected to fine crushing and then screening, screen size when screening is 2 ~ 5mm, obtains the mine fine crushing under sieve;
(3) mine fine crushing is fed one section of ball mill to roughly grind, ore grinding pulp density 50 ~ 70%, and is divided with spiral classifier Grade, the fineness for obtaining one section of overflow product is 0.074 ~ 0.15mm;
(4) one section of overflow product is subjected to the direct flotation that thick three essence two is swept;Roughing regime of agent are as follows: to raw ore mine-supplying quantity, water Glass dosage is 400 ~ 800g/t, and collector dosage is 800 ~ 1200g/t, at this time roughing pulp pH value 7 ~ 8, ore pulp mass concentration 30~40%;The rougher concentration that roughing obtains carries out triple cleaning and obtains phosphorus concentrate, selected regime of agent are as follows: to raw ore mine-supplying quantity, Each selected waterglass dosage is 100 ~ 200g/t;The rougher tailings that roughing obtains is scanned to obtain flotation tailing twice, sweeps Select regime of agent are as follows: to raw ore mine-supplying quantity, scan 200 ~ 300g/t of collector dosage every time;Every time selected tailing, scan Concentrate successively returns to previous step flotation circuit;Flotation concentrate and flotation tailing are obtained after direct flotation;Wherein flotation concentrate is made For phosphorus concentrate;
(5) flotation tailing is fed into two sections of ball mills and carries out fine grindings, and with hydrocyclone isolate granularity be 0.038 ~ Two sections of overflow products of 0.045mm;
(6) two sections of overflow products are subjected to two sections of low intensity magnetic separations;Magnetic field strength 800Oe ~ 1000Oe, first segment when first segment low intensity magnetic separation One section of weak magnetic concentrate selection that low intensity magnetic separation obtains carries out second segment low intensity magnetic separation, and magnetic field strength 1000Oe when second segment low intensity magnetic separation ~ 1500Oe, two sections of weak magnetic concentrate selections that second segment low intensity magnetic separation obtains are as iron ore concentrate;
(7) whole low intensity magnetic separation tailings that two sections of low intensity magnetic separations obtain are fed into Ball-stirring mill and carries out Ultrafine Grinding, and divided with hydrocyclone Separate out three sections of overflow products of 0.015 ~ 0.025mm;
(8) three sections of overflow products are subjected to two sections of high intensity magnetic separations, one section of high intensity magnetic separation concentrate that first segment high intensity magnetic separation obtains carries out second Section high intensity magnetic separation, as ilmenite concentrate, the magnetic field strength of two sections of high intensity magnetic separations is two sections of high intensity magnetic separation concentrate that second segment high intensity magnetic separation obtains 3500 ~ 5000Oe, the tailing that two sections of high intensity magnetic separations obtain is as true tailings.
2. the method for phosphorus, iron and titanium mineral in a kind of synthetical recovery Magmatic Phosphorus ore described according to claim 1, P in phosphorus concentrate described in being characterized in that2O5Grade 31 ~ 36%, P2O5The rate of recovery 75 ~ 90%;TFe grade 64 ~ 67%, Fe in iron ore concentrate The rate of recovery 40 ~ 55%;TiO in ilmenite concentrate2Grade 40 ~ 49%, TiO2The rate of recovery 35 ~ 60%.
3. the method for phosphorus, iron and titanium mineral in a kind of synthetical recovery Magmatic Phosphorus ore described according to claim 1, The on-the-sieve material for being characterized in that step (2) screening obtains returns to process fine crushing.
4. the method for phosphorus, iron and titanium mineral in a kind of synthetical recovery Magmatic Phosphorus ore described according to claim 1, One section of sand setting of the acquisition after being characterized in that step (3) classification returns to one section of ball mill.
5. the method for phosphorus, iron and titanium mineral in a kind of synthetical recovery Magmatic Phosphorus ore described according to claim 1, The roughing time for being characterized in that step (4) is 4 ~ 6min, the time that is selected and scanning is 2 ~ 3min, 30 ~ 40 DEG C of flotation temperature.
6. the method for phosphorus, iron and titanium mineral in a kind of synthetical recovery Magmatic Phosphorus ore described according to claim 1, It is characterized in that two sections of sand settings that step (5) obtain return to two sections of ball mills.
7. the method for phosphorus, iron and titanium mineral in a kind of synthetical recovery Magmatic Phosphorus ore described according to claim 1, It is characterized in that three sections of sand settings that step (7) obtain return to Ball-stirring mill.
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