CN105327772A - Pre-desliming beneficiation method for fine-grain embedded molybdenum ore - Google Patents
Pre-desliming beneficiation method for fine-grain embedded molybdenum ore Download PDFInfo
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Abstract
The invention discloses a pre-desliming beneficiation method for fine-grained embedded molybdenum ore, which is characterized in that raw ore is subjected to (1) ore grinding, (2) grading, (3) desliming, (4) molybdenum sulfide roughing, (5) primary regrinding of molybdenum sulfide rough concentrate, (6) concentration of molybdenum sulfide rough concentrate, (7) secondary regrinding and (8) concentration in sequence to obtain molybdenum sulfide concentrate with the molybdenum grade of more than 45%. Compared with the prior art, the method adopts a mode of desliming in advance before flotation after grinding aiming at the molybdenum sulfide ore containing a large amount of easily argillized minerals in the ore, so that the ore mud which consumes mineral dressing agents and influences the subsequent flotation is removed in advance, the subsequent operation pressure is greatly reduced, and the agent dosage is reduced. The beneficiation method for the refractory molybdenum sulfide ore rich in easily-argillized minerals has the advantages of strong adaptability, convenience in control in production, low subsequent operation cost and low medicament consumption.
Description
Technical field
The invention belongs to technical field of beneficiation, be specifically related to a kind of predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore, be particularly useful for the ore that molybdenum sulfide disseminated grain size is thin.
Background technology
Mu Shi China advantage strategic resource, is widely used in the numerous areas in the social productions such as space flight and aviation, Ferrous Metallurgy, chemical industry, electronics.Along with the fast development of economic society, the demand of molybdenum is increasing, and the Mo resource causing China's high-quality easily to select reduces in a large number, and the difficulty that, disseminated grain size more containing mud is thinner selects molybdenite ore dressing to reclaim the attention causing bargh.
Current sulfuration molybdenum ore ore dressing processing method adopts corase grind to roughly select usually, the technological process that coarse concentrate regrinding is selected.When easy argillization mineral content is high and in corase grind situation, the a small amount of thin mud that ore grinding produces can not affect greatly flotation, even if there is the impact just can eliminating thin mud by adding the medicaments such as appropriate waterglass, slaine, modified water glass, calgon.But when containing more easy argillization mineral in ore, as montmorillonite, serpentine, chlorite, talcum, muscovite, kaolinite etc., and the disseminated grain size of molybdenite belongs to fine-grained disseminated grain again, primary grinding fineness exceedes-0.074mm60%, will there is a large amount of thin mud in ore milling product ,-10 μm of content can reach more than 50% more than 15% ,-30 μm of content, form obvious slime coating, have a strong impact on molybdenite flotation.
Predictive desliming is the method that ore dressing circle is commonly used for the ore more containing mud, desliming process and equipment patent have many, as multistage thickener or the desliming of desliming bucket, reverse-floatation mud-removing, multi-section cyclone device associating desliming, the employing selective flocculation to remove slime technique matched with magnetic separation.But due to the native hydrophobic characteristic of molybdenum sulfide self, adopt conventional free settling desliming mode, while removing sludge, a large amount of molybdenum sulfide mineral can run off together along with sludge, as patent CN102847350A adopt small diameter cyclone two sections series connection desliming, also cannot ensure not lose more amount of metal in sludge, in existing molybdenum sulfide ore-dressing technique, therefore still there is no the commercial Application precedent of predictive desliming.
Summary of the invention
For problems of the prior art, the invention provides a kind of predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore.Be fine-grained disseminated grain molybdenum ore owing to sorting object, therefore primary grinding fineness needs to reach below 0.074mm and accounts for 60%-85%, to ensure that molybdenite basic monomer dissociates.The first classification of ore milling product, the fine fraction entering desliming device controls in narrower particle size range.Desliming process is selected to complete in higher centrifugal field, not single gravitational field and lower centrifugal field, therefore desliming device does not adopt traditional desliming bucket, thickener, sloping plate grading machine, and the desliming process gravity of this kind of dependence free settling cannot overcome the hydrophobic tension force of molybdenite.Also do not adopt small diameter cyclone, its centrifugal force is large not.The present invention uses the high-revolving centrifugal separation equipments such as butterfly centrifugal machine, horizontal centrifuge, high speed disc separator, the hydrophobic tension force of molybdenite is overcome by powerful centrifugal force, thus ensure remove in thin mud and only lose few molybdenum amount, and desliming efficiency is higher.Removing after major part affect the sludge of flotation, sorting in process and add appropriate adjusting agent again and disperse remaining sludge and suppress, thus ensure that molybdenum is roughly selected and can efficiently carry out.
Fine-grained disseminated grain molybdenite due to floatability poor, rougher process, except hydrocarbon oils collecting agent, also can add a small amount of Polar Collectors.For ensureing to roughly select the rate of recovery, rough concentrate grade is unsuitable too high, controls 3% ~ 8%.Coarse concentrate regrinding fineness is determined more than 95% according to molybdenite liberation degree of minerals, is suppressed by appropriate adjusting agent every section of dissociateed gangue of regrinding.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A predictive desliming beneficiation method for fine-grained disseminated grain molybdenum ore, step is as follows:
(1) ore grinding: for ensure molybdenum sulfide and gangue mineral elementary solution from, need carry out ore grinding to raw material, mog is that below 0.074mm accounts for 60%-85%;
(2) classification: in order to ensure sludge elimination efficiency and the loss of minimizing molybdenum in sludge in ore milling product, this method adopts first classification, after classification, the mode of narrow rank desliming is carried out, first adopt classifying equipoment to be 20 μm-50 μm to the product after ore grinding in step (1) according to partition size and carry out classification, obtain coarse grain, particulate two kinds of materials;
(3) desliming: adopt desliming device to carry out desliming to the fine obtained after step (2) classification, slough 0 ~ 10 μm to 0 ~ 30 μm sludge, obtain the material after desliming, the sludge removed abandons as mine tailing;
(4) molybdenum sulfide is roughly selected: add after mixing of materials after the desliming obtain the coarse-grained material obtained after step (2) classification and step (3) and carry out molybdenum sulfide after adjusting agent, collecting agent and foaming agent are sized mixing and roughly select for 1 time, scan for 1-3 time, 1-2 time selected in advance, obtains the molybdenum sulfide rough concentrate containing Mo3%-8%;
(5) molybdenum sulfide rough concentrate is once regrinded: the molybdenum sulfide rough concentrate that step (4) obtains once is regrinded, then grinding rate is that below 0.031mm accounts for 60%-90%;
(6) molybdenum sulfide rough concentrate is selected after once regrinding: in the product obtained after step (5) is once regrinded, add adjusting agent, collecting agent size mixing after selected 1-3 time, essence is scanned 1-4 time, and obtain concentrate and cleaner tailings, cleaner tailings directly throws tail;
(7) secondary is regrinded: carry out secondary to the concentrate obtained in step (6) and regrind, and secondary again grinding rate is that below 0.031mm accounts for 70%-95%;
(8) secondary is selected after regrinding: the molybdenum sulfide concentrate being greater than 45% to selected 2-5 acquisition molybdenum grade of sizing mixing after the product obtained after step (7) secondary is regrinded adds adjusting agent, collecting agent.
Described fine-grained disseminated grain molybdenum ore refers to that the average disseminated grain size of molybdenite is less than 0.074mm.
Classifying equipoment in described step (2) is hydrocyclone, spiral classifier or sloping plate grading machine.
Desliming device in described step (3) is butterfly centrifugal machine, horizontal centrifuge, high speed disc separator.
In described step (3), desliming amount accounts for the 6%-40% of total material, accounts for 20% ~ 80% of fine.
In described step (4), adjusting agent is at least one in aluminum sulfate, ferrous sulfate, zinc sulfate, light water glass, modified water glass or calgon, and consumption is 10-5000g/t; Collecting agent in described step (4) is at least one in kerosene, diesel oil, butyl ammonium aerofloat, thiourethane or butyl xanthate, and consumption is 10-200g/t, and foaming agent is terpenic oil, methyl isobutyl carbinol or other composite alcohols, and consumption is 1-50g/t.
The equipment that described step (5) is once regrinded and step (7) secondary is regrinded to be adopted is vertical stirring mill, Chinese mugwort Sa grinding machine or tower grinding machine.
Adjusting agent in described step (6) and step (8) is at least one in sodium thioglycolate, aluminum sulfate, ferrous sulfate, zinc sulfate, vulcanized sodium, P-Nokes or waterglass and modified water glass, and consumption is 5-2000g/t.
Collecting agent in described step (6) and step (8) is kerosene or diesel oil, and consumption is 1-20g/t.
Molybdenum sulfide rough concentrate in described step (6) and step (8) after once regrinding selected and secondary regrind after selected device therefor be flotation column or flotation device.
Beneficial effect of the present invention: compared with prior art, the sulfuration molybdenum ore that the present invention is directed to containing a large amount of easily argillization mineral in ore adopts the mode of predictive desliming before flotation after ore grinding, the sludge that consumption beneficiation reagent affects follow-up flotation is simultaneously removed in advance, significantly reduce subsequent job pressure, decrease dosing, make again beneficiating efficiency increase substantially simultaneously.Adaptability of the present invention is comparatively strong, and be convenient in production control, follow-up operating cost is not high, and dosing is lower.
Accompanying drawing explanation
Fig. 1 is the beneficiation flowsheet figure of the embodiment of the present invention 1.
Detailed description of the invention
Embodiment 1
Raw material is that the difficulty of Henan argillaceous class mineral selects molybdenum sulfide ore, wherein containing Mo0.157%, and smectite content 15%, kaolinite content 10%, a small amount of serpentine, talcum, easy argillization mineral content accounts for 30% of total mineral quantity, and its ore dressing process is made up of following components:
(1) ore grinding: raw material needs through ore grinding before ore dressing, mog is that below 0.074mm accounts for 70.3%;
(2) classification: adopt hydrocyclone that ore milling product in step (1) is divided into thickness two kinds of materials, partition size is 0.031mm, wherein-0.031mm content 25.5% in coarse-grained material, and in fine ,-0.031mm content accounts for 98.1%;
(3) desliming: adopt butterfly centrifugal machine to carry out desliming to step (2) fine, desliming amount accounts for 40% of feed, accounts for 16.03% of raw ore, containing Mo0.074% in sludge;
(4) molybdenum sulfide is roughly selected: in coarse-grained material in step (2) and step (3) after desliming mixing of materials raw ore per ton stir 3 minutes after adding adjusting agent waterglass 2000g, interpolation collecting agent kerosene 100g per ton, butyl ammonium aerofloat 30g, roughly select 2 molybdenum sulfides through 1 molybdenum sulfide after terpenic oil 15g stirs 2 minutes and scan 1 preconcentration, obtain containing Mo3.12% molybdenum sulfide rough concentrate;
(5) molybdenum sulfide rough concentrate is once regrinded: in step (4), molybdenum sulfide rough concentrate adopts vertical stirring mill once to regrind, then grinding rate accounts for 75% for-0.031mm;
(6) molybdenum sulfide rough concentrate is selected: add waterglass 1000g, sodium thioglycolate 500g/t, kerosene 50g/t to the raw ore per ton of product in step (5), terpenic oil 5g/t, scan through 2 selected 4 essences, obtain concentrate and cleaner tailings, cleaner tailings directly throws tail;
(7) secondary is regrinded: carry out secondary to concentrate in step (6) and regrind and clean reagent removal, adopt vertical stirring mill to carry out secondary and regrind, then grinding rate accounts for 83% for-0.031mm to concentrate in step (6);
(8) selected: by raw ore per ton, waterglass 300g/t, collecting agent kerosene 10g/t are added to product in step (7), after to size mixing selected acquisition for 3 times containing the qualified molybdenum sulfide concentrate of Mo47.18%, molybdenum recovery 71.51%.Concrete mineral processing index is in table 1
Table 1 embodiment 1 ore dressing result
embodiment 2
Raw material is Henan green mud stone-type molybdenum sulfide ore, wherein containing Mo0.097%, and chlorite content 10%.Be made up of following components:
(1) ore grinding: raw material needs through ore grinding before ore dressing, mog is that below 0.074mm accounts for 60.4%;
(2) classification: adopt sloping plate grading machine to be divided into thickness two kinds of materials to ore milling product in step 1, partition size is 0.031mm, wherein coarse-grained material-0.031mm content 19.13%, and fine-0.031mm content accounts for 97.4%;
(3) desliming: adopt high speed disc separator to carry out desliming to step (2) fine, desliming amount accounts for 50% of feed, accounts for 4.06% of raw ore, containing Mo0.044% in sludge;
(4) molybdenum sulfide is roughly selected: after desliming mixing of materials adds waterglass 500g by raw ore per ton, stir 3 minutes in coarse-grained material in step (2) and step (3), add collecting agent kerosene 80g, carry out 1 molybdenum sulfide after methyl isobutyl carbinol 30g stirs 2 minutes to roughly select 1 preconcentration and scan for 1 time, obtain containing Mo3.48% molybdenum sulfide rough concentrate;
(6) molybdenum sulfide rough concentrate is once regrinded: in step (4), molybdenum sulfide rough concentrate adopts vertical stirring mill once to regrind, then grinding rate accounts for 75.13% for-0.031mm;
(7) molybdenum sulfide rough concentrate is selected: add waterglass 300g/t to product in step (6) by raw ore per ton, sodium thioglycolate 200g/t, kerosene 40g/t, methyl isobutyl carbinol 5g/t, selected 2 essences scan 2 times, and obtain concentrate and cleaner tailings, cleaner tailings directly throws tail;
(8) secondary is regrinded: carry out secondary to concentrate in step (7) and regrind and clean reagent removal, adopt vertical stirring mill to carry out second time and regrind, then grinding rate accounts for 70.63% for-0.031mm to concentrate in step (7);
(9) selected: by raw ore per ton, waterglass 100g/t, collecting agent kerosene 20g/t are added to product in step (8), after to size mixing selected acquisition for 2 times containing the qualified molybdenum sulfide concentrate of Mo50.13%, molybdenum recovery 76.89%.Concrete mineral processing index is in table 2
Table 2 embodiment 2 mineral processing index
Known by the comparing result of this method and conventional beneficiation flowsheet in above two examples, adopting the method for this patent to dish out in advance affects the sludge of follow-up ore-dressing practice on a small quantity, and final mineral processing index obtains and significantly improves.
Claims (10)
1. a predictive desliming beneficiation method for fine-grained disseminated grain molybdenum ore, is characterized in that step is as follows:
(1) ore grinding: ore grinding is carried out to fine-grained disseminated grain molybdenum ore, mog is that below 0.074mm accounts for 60%-85%;
(2) classification: adopt classifying equipoment to be 20 μm-50 μm to the product after ore grinding in step (1) according to partition size and carry out classification, obtain coarse grain, particulate two kinds of materials;
(3) desliming: adopt desliming device to carry out desliming to the fine obtained after step (2) classification, slough 0.01 ~ 10 μm to 0.01 ~ 30 μm sludge, obtain the material after desliming, the sludge removed abandons as mine tailing;
(4) molybdenum sulfide is roughly selected: add after mixing of materials after the desliming obtain the coarse-grained material obtained after step (2) classification and step (3) and carry out molybdenum sulfide after adjusting agent, collecting agent and foaming agent are sized mixing and roughly select for 1 time, scan for 1-3 time, 1-2 time selected in advance, obtains the molybdenum sulfide rough concentrate containing Mo3%-8%;
(5) molybdenum sulfide rough concentrate is once regrinded: the molybdenum sulfide rough concentrate that step (4) obtains once is regrinded, then grinding rate is that below 0.031mm accounts for 60%-90%;
(6) molybdenum sulfide rough concentrate is selected after once regrinding: in the product obtained after step (5) is once regrinded, add adjusting agent, collecting agent size mixing after selected 1-3 time, essence is scanned 1-4 time, and obtain concentrate and cleaner tailings, cleaner tailings directly throws tail;
(7) secondary is regrinded: carry out secondary to the concentrate obtained in step (6) and regrind, and secondary again grinding rate is that below 0.031mm accounts for 70%-95%;
(8) secondary is selected after regrinding: add adjusting agent, the collecting agent molybdenum sulfide concentrate that after sizing mixing, selected 2-5 acquisition molybdenum grade is greater than 45% to the product obtained after step (7) secondary is regrinded.
2. the predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore according to claim 1, is characterized in that: described fine-grained disseminated grain molybdenum ore refers to that the average disseminated grain size of molybdenite is less than the molybdenum ore of 0.074mm.
3. the predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore according to claim 1, is characterized in that: the classifying equipoment in described step (2) is hydrocyclone, spiral classifier or sloping plate grading machine.
4. the predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore according to claim 1, is characterized in that: the desliming device in described step (3) is butterfly centrifugal machine, horizontal centrifuge, high speed disc separator.
5. the predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore according to claim 1, is characterized in that: in described step (3), desliming amount accounts for the 6%-40% of total material.
6. the predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore according to claim 1, it is characterized in that: in described step (4), adjusting agent is at least one in aluminum sulfate, ferrous sulfate, zinc sulfate, light water glass, modified water glass or calgon, and consumption is 10-5000g/t; Collecting agent in described step (4) is at least one in kerosene, diesel oil, butyl ammonium aerofloat, thiourethane or butyl xanthate, consumption is 10-200g/t, foaming agent in described step (4) is terpenic oil, methyl isobutyl carbinol or other composite alcohols, and consumption is 1-50g/t.
7. the predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore according to claim 1, is characterized in that: the equipment that described step (5) is once regrinded and step (7) secondary is regrinded to be adopted is vertical stirring mill, Chinese mugwort Sa grinding machine or tower grinding machine.
8. the predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore according to claim 1, it is characterized in that: the adjusting agent in described step (6) and step (8) is at least one in sodium thioglycolate, aluminum sulfate, ferrous sulfate, zinc sulfate, vulcanized sodium, P-Nokes or waterglass and modified water glass, and consumption is 5-2000g/t.
9. the predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore according to claim 1, is characterized in that: the collecting agent in described step (6) and step (8) is kerosene or diesel oil, and consumption is 1-20g/t.
10. the predictive desliming beneficiation method of fine-grained disseminated grain molybdenum ore according to claim 1, is characterized in that: the molybdenum sulfide rough concentrate in described step (6) and step (8) after once regrinding selected and secondary regrind after selected device therefor be flotation column or flotation device.
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