CN102974470A - Oolitic hematite flocculant and oolitic hematite selective dispersion agglomeration separation method - Google Patents
Oolitic hematite flocculant and oolitic hematite selective dispersion agglomeration separation method Download PDFInfo
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Abstract
The invention provides a oolitic hematite flocculant, which is prepared by mixing carboxymethyl starch, sodium acrylate, a cross-linking agent and an initiator, heating for reaction for a certain time, and purifying; the flocculant has strong selective adsorption capacity on hematite, can be used for the selective flocculation (agglomeration) sedimentation desliming of oolitic hematite, and can obtain a high agglomeration adsorption effect at a low dosage; the invention also provides a oolitic hematite selective dispersion agglomeration separation method, which is simple in process, low in grinding fineness requirement, capable of efficiently agglomerating and settling fine hematite minerals in a short time, and good in all-iron recovery rate and grade.
Description
Technical field
The present invention relates to a kind of bloodstone and sort, particularly flocculant and the oolitic hematite used of a kind of oolitic hematite ore dressing selectively disperses the agglomerate method for separating.
Background technology
1/9 of China's iron ore deposit reserves are oolitic hematite, account for 30% of China's hematite reserves.This class oolitic hematite often forms large-scale mine, for example a surname in north dragon formula iron ore, southern Ningxiang formula iron ore.The oolitic hematite disseminated grain size superfine and often with siderite, chamosite and phosphorus ore containing symbiosis or mutual parcel, therefore be the present domestic and international iron ore type of generally acknowledged the most difficult choosing.Because the oolitic hematite disseminated grain size is superfine and the mutual structure of parcel layer by layer, thus be unfavorable for very much the monomer dissociation of ore, and ore forms subparticle especially easily behind muck and ore grinding, and clay content is large.The domestic and international ore dressing research of oolitic hematite comprises dephosphorization, desiliconization, reverse floatation process, high-gradient magnetic separation, new equipment and new technology, direct-reduction process, acidleach, chloridising roasting-acid leaching process etc., but to the report of its successful enrichment but seldom.Therefore, complex structure, grade are low, the roe shape iron ore deposit characteristics of easy argillization, and this smelting of selecting that has just determined such roe shape iron ore is very difficult.Along with the high speed development of China's steel and iron industry, the poor Iron Ore Reserve of high-grad iron ore deposit and Yi Xuan is increasingly exhausted, and the research of its utilization is had very important strategic importance.How the iron ore deposit in the oolitic hematite is exploited out, become a great problem of present comprehensive utilization of resources.
Past attempts has been carried out a large amount of Experimental study on ore dressing work to the type iron ore, wherein the sorting index of reduction roasting-weak magnetic separation process is relatively better, but because its technological difficulties are to need Ultrafine Grinding, not only cause this process costs high, industrializing implementation is difficult, and the fine grinding degree is too high, and mineral will produce argillization in various degree, the argillization material easily transfers agglomerate to by dispersity in water, floatation process is produced adverse effect.And the Ultra-fine iron minerals that the preparation equipment of present routine and medicament are difficult to effectively reclaim-10 μ m, so the type iron ore resource does not obtain utilizing substantially.Along with the available iron ore deposit of China reduces gradually, the efficient technique of preparing of research oolitic hematite stone has highlighted importance and urgency.Relevant Preliminary Results proves that the efficient ore-dressing technique such as Ultrafine Grinding-selective flocculation (agglomerate)-high intensity magnetic separation or flotation, reduction roasting-Ultrafine Grinding-selective flocculation (agglomerate)-low intensity magnetic separation or flotation or selecting smelting combination technique have manifested its superiority.
Provide a kind of selective flocculation to remove slime method in the document " difficulty is selected the research of oolitic hematite composite drug system Desliming test; Peng Huiqing etc.; Modern Mineral; the 3rd phase of March in 2009 ", as flocculant take modified starch, with NaOH, waterglass and sodium carbonate are dispersant, after dispersant and raw ore are milled to altogether the 92wt% mineral granularity and reach below the 0.025mm, size mixing (mass fraction of solids 20%), then add flocculant sedimentation desliming, it is 11 o'clock that the method requires pH values of pulp, just can reach better desliming effect, and flocculant consumption preferably grade and rate of recovery of guarantee when being 400g/ ton ore pulp (or raw ore), this flocculation ability that this technique flocculant is described a little less than, and the technological requirement of this high alkalinity will cause significant damage to equipment, and reagent dosage is too high simultaneously, and will be economical not.
Document " fine oolitic hematite flocculation behavioral study; Li Feng waits so long; metal mine; o. 11th in 2009 " provides a kind of flocculating setting Desliming method, be to mass fraction of solids be add dispersant and flocculant in 2% the ore pulp after, sedimentation desliming sorting, the document studies show that, dispersant dispersibility and consumption are larger on the flocculating effect impact, dispersant is sodium metasilicate (consumption be 40mg/L ore pulp-be 2000g/ ton raw ore) or sodium phosphate trimer (consumption be 5mg/L ore pulp-be 250g/ ton raw ore) preferably, on this basis, flocculant used in amounts 1mg/L ore pulp (being 50g/ ton raw ore), and in the Flocculation Settling Process, pH values of pulp should be controlled in 10 ~ 11 scopes equally.
Relevant research shows that in oolitic hematite sedimentation desliming assorting room, the kind of dispersant and flocculant and consumption are remarkable to sedimentation desliming influential effect, and the dispersant dispersibility is different, and is also different on the impact of system flocculating degree.When strong or consumption is higher when the dispersant dispersibility, the flocculation ability of flocculant will be suppressed, can improve the bloodstone flocculating effect by improving the flocculant consumption, but because flocculant is subject to bloodstone and the poor impact of quartzy gangue surface potential to the selective absorption of bloodstone, improve simply the flocculant consumption and change easily this potential balance, reduce the selective absorption effect, the most direct performance is that the bloodstone rate of recovery improves and the grade of concentrate descends, and for fear of this situation, accordingly, must be by regulating slurry pH to guarantee the balance of mineral surface current potential.In the existing flocculation sorting process, in the higher situation of flocculant consumption, separating effect generally is full iron recovery 95 ~ 97% preferably, full iron grade 52 ~ 53%.
In sum, yet there are no which kind of flocculant can be under non-alkalescence or weak basic condition the oolitic hematite in the selective absorption ore pulp, and be issued to preferably mineral mass settlement effect at consumption than low condition.
Summary of the invention
One of purpose of the present invention is for the deficiencies in the prior art, and a kind of oolitic hematite flocculant is provided, and its preparation method is simple, and condition is easily controlled, product with stable quality, can the selective absorption bloodstone and adsorption capacity stronger, but to sludge substantially without absorption; When being used for oolitic hematite selective flocculation (agglomerate) sedimentation desliming, to mash acid alkalinity without harsh requirement, can obtain better bloodstone agglomerate mass settlement and desliming effect under low consumption condition, the full iron recovery of sorting gained concentrate and grade are all comparatively excellent.
Oolitic hematite flocculant of the present invention is to adopt following steps to make:
A, get CMS, acrylic acid, initator, crosslinking agent and deionized water and mix, get mixed material, in the mixed material, the percentage by weight of each component is respectively: CMS 10～20%, acrylic acid 50～60%, initator 0.5～2%, crosslinking agent 0.01～0.1%, surplus is deionized water;
The temperature to 70 of b, rising mixed material～90 ℃ are incubated 3 ~ 6 hours under the stirring condition, must contain the mixed system of CMS and PAA graft;
C, to described mixed system carry out suction filtration, the washing after under vacuum condition 50 ~ 70 ℃ be dried to constant weight, get crude product;
D, secondary are purified: crude product is mixed at least 20h of also Soxhlet extracting with methyl alcohol, then in not being higher than under 60 ℃ of temperature vacuum drying extracting gained solid to constant weight, obtain CMS and the PAA graft of purifying, described purifying graft is flocculant required for the present invention, during the Soxhlet extracting, the weight ratio of methyl alcohol and crude product is not less than 2.
Among the step a, CMS is a kind of water soluble starch ether, flocculation with the intrinsic chelating of carboxyl, ion-exchange, many tools anion, and CMS and PAA copolymerization can be introduced carboxylate groups at starch molecule, this not only allows the graft electronegativity stronger, and it is poor to improve in the ore pulp bloodstone and quartzy gangue surface potential, makes graft stronger to the selective absorption of bloodstone, but to the quartz vein ground mass this without absorption; The structure of described CMS graft acrylic acid sodium is tight embedding state, and CMS combines a large amount of acrylic acid side chains as the skeleton of graft near it.
The embedding structure that this flexible chain (acrylic acid side chain) and rigid chain (CMS skeleton) interpenetrate, mutually combine is so that methyl starch and PAA graft graft copolymer have following these characteristics:
(1) CMS is connected by chemical bond with PAA in the mode of grafting, further increased the molecular weight of compound, and the molecular weight of flocculating effect and flocculant is closely-related, that is to say that the flocculating effect of CMS graft acrylic acid sodium is better than virgin pp acid sodium.
(2) macromolecular chain of CMS is semirigid, and strongly hydrophilic, therefore CMS can open strand by swelling in water, thereby has very large spatial volume, the flexible polyacrylic acid side chain of access in the large molecule of this skeleton, just formed the net macromolecular of tempering toughness with gentleness, such molecular structure is more favourable to catching suspended particles, and is particularly just more remarkable for fine its effect of bloodstone particle.
(3) high polymer coagulant is because the flocculation group is too concentrated, when being flocculated material and being adsorbed on around it, produced each other repulsion, played certain peptizaiton, thereby affected the effect of flocculation.And graft type acrylic acid is to be branched structure, and the flocculation group disperses, thereby has overcome this shortcoming, has improved flocculating effect.
(4) generally speaking, macromolecule is in situation about dissolve, and molecular weight is larger, and flocculation efficiency is higher.In addition, the high molecular flocculation efficiency with electric charge will be higher than neutral high molecular flocculation efficiency.
Therefore, gained flocculant of the present invention is comparatively outstanding to the selective adsorption capacity of bloodstone, can be lower and in the higher situation of dispersant dosage, obtain preferably flocculating effect at self consumption, and disperse full iron recovery and the grade of gained concentrate all comparatively outstanding.
Among the present invention, the consumption of the materials such as described CMS, PAA and initator suits, and they can allow, and functional group keeps in the reasonable scope on graft molecular weight, chain length and the strand of gained; For initator and crosslinking agent, surpass limited range of the present invention such as their consumption, with to participate in the free radical of reaction excessive, the quantity of growing chain increases, and stopping of chain is accelerated the reduction of graft molecular weight, adsorption capacity descends, and causes easily the PAA autohemagglutination simultaneously, and side reaction is too much.
During use, adding flocculant of the present invention in the ore pulp system of fully disperseing to the bloodstone suspended substance gets final product, the flocculant consumption generally is no more than 100g/ ton raw ore, and (expression way of 100g/ ton raw ore refers to that raw ore per ton uses reagent 100g, all the other are all same), mass fraction of solids generally is no more than 25% in the ore pulp.In described flocculant amount ranges under (being in the 100g/ ton raw ore) and the abundant dispersion condition of bloodstone suspended substance, the flocculant consumption is higher, mineral mass settlement effect is better, when the flocculant consumption surpasses 100g/ ton raw ore, it remains effective to the bloodstone mass settlement, but it is no longer obvious that sedimentation rate promotes, and can descend to the selective adsorption capacity of bloodstone simultaneously; When the pulp solids mass fraction is 25%, when the flocculant consumption was 50g/ ton raw ore, the bloodstone sedimentation rate can reach 90% substantially, and was low to moderate 20g/ ton raw ore when the flocculant consumption, and when the pulp solids mass fraction was 20%, the bloodstone sedimentation rate can be in 80% level.Ore pulp adopts common process to carry out hematite flotation after flocculation (agglomerate)-desliming is processed, and the gained concentrate rate of recovery can improve 5% ~ 20% than prior art, and full iron grade can improve 5% ~ 10% than prior art.
Need to prove, because among the present invention, CMS and PAA graft copolymer are the active ingredient that plays flocculation, contained this active ingredient among the step b in the mixed system of gained, therefore, as equivalents of the present invention, described mixed system directly is used for oolitic hematite flocculation sorting as flocculant allows, just its flocculating effect is outstanding not as the flocculating effect of pure graft.
As better scheme, described initator is persulfate, and described crosslinking agent is epoxychloropropane or glycerine, and the molecular weight of described graft is 1 * 10
3～1 * 10
7Can better improve the reaction rate of CMS and PAA copolyreaction with epoxychloropropane or glycerine as crosslinking agent, improve the degree of polymerization of graft.
Two of purpose of the present invention is that oolitic hematite selectively disperses the agglomerate method for separating, comprises the steps:
1. ore grinding is sized mixing: oolitic hematite raw ore and dispersant are ground altogether make fineness account for 70～90% of raw ore weight less than the ore content of 0.074mm, then add water and size mixing, get ore pulp;
2. a sedimentation desliming: after adding described flocculant in the ore pulp and mixing, after standing sedimentation to mineral syrup liquid no longer descends, the upper strata suspension is separated with the lower floor ore pulp, get rough concentrate;
3. secondary settlement desliming: rough concentrate returned size mixing after regrinding, get the rough concentrate ore pulp, add flocculant in the rough concentrate ore pulp, after mixing, standing sedimentation to mineral syrup liquid no longer descends, and the upper strata suspension is separated with the lower floor ore pulp, gets concentrate.Step adopts siphon or magnetic selection method all can realize the purpose that bloodstone is separated with gangue mineral 2. and 3..
It is improvement to existing flocculation sorting process that oolitic hematite of the present invention selectively disperses the agglomerate method for separating, wherein, dispersant allow to adopt conventional hematite separation dispersant, dispersant dosage so that in the ore pulp bloodstone suspended substance fully disperse to get final product.
The method not only technique is simple, and it is low that mog requires, and owing to adopted the flocculant that bloodstone is possessed outstanding selective adsorption capacity, has realized that within a short period of time fine bloodstone mineral can be by efficient mass settlement, and the bloodstone rate of recovery is protected; Simultaneously, because flocculant possesses stronger adsorption capacity, so that dispersant weakens the impact of flocculating effect, even if dispersant dosage is higher, flocculant consumption of the present invention also can be significantly less than the flocculant use amount of prior art; On the other hand, the inventive method has overcome the deficiency that existing flocculation process need to carry out under the high alkalinity condition, is a kind of technique that can carry out under low alkalinity or ore pulp nature pH condition, and is light to the corrosivity harm of equipment.
Low-grade difficulty was selected the oolitic hematite sorting during the inventive method was applicable to, and adopted the inventive method, and the rate of recovery of gained bloodstone can be not less than 90%, and concentrate grade can be not less than 52%.
As better scheme, ore grinding is sized mixing when the mass fraction of solids of gained ore pulp is 10～15%, sedimentation desliming in the step, and the flocculant consumption is 20～100 grams/ton raw ore.This mass fraction of solids makes the ore pulp system lower to dispersant dispersibility or consumption requirement, thereby further improve reduction dispersant and flocculant consumption to the impact of mineral surface current potential, bloodstone flocculating setting efficient, the rate of recovery and recovery gained concentrate grade are better.
As better scheme, the mass fraction of solids of rough concentrate ore pulp is 10～15%, and during the secondary settlement desliming, the consumption of flocculant is 10～50 grams/ton raw ore.
As better scheme, described dispersant comprises that consumption is that 100～500 grams/ton sodium carbonate of raw ore and consumption are the sodium metasilicate of 100～1000 grams/ton raw ore.The composite dispersant dispersibility of sodium carbonate and sodium metasilicate is better, can make mineral reach abundant dispersity under low consumption; Generally speaking, when pulp density is low, dispersant dosage also can correspondingly reduce, sodium carbonate amount be 100g/ ton raw ore and sodium metasilicate consumption be 100g/ ton raw ore, when the ore pulp mass fraction is 15%, contained bloodstone suspended substance can reach the state of abundant dispersion substantially in the ore pulp, when improving dispersant dosage, can make the mineral grain dispersion effect better, for the present invention, sodium carbonate amount is no more than 500g/ ton raw ore and the sodium metasilicate consumption is no more than in the 1000g/ ton raw ore situation, all can realize purpose of the present invention.
As better scheme, step 3. in behind the coarse concentrate regrinding, the ore content that fineness is lower than 0.074mm accounts for 90～95% of the contained ore gross weight of rough concentrate.Further fine grinding can make bloodstone monomer dissociation degree better, improves the rate of recovery of bloodstone.
As better scheme, sodium carbonate amount is 500 grams/ton raw ore, and the sodium metasilicate consumption is 800 grams/ton raw ore.
As better scheme, during a sedimentation desliming, the flocculant consumption is 50 grams/ton raw ore, and the flocculant consumption is 20 grams/ton raw ore during the secondary settlement desliming.
Beneficial effect of the present invention:
In sum, the invention provides a kind of oolitic hematite flocculant, its preparation method is simple, and condition is easily controlled, product with stable quality, can the selective absorption bloodstone and adsorption capacity stronger, but to sludge substantially without absorption; When being used for oolitic hematite selective flocculation (agglomerate) sedimentation desliming, to mash acid alkalinity without harsh requirement, can obtain better bloodstone agglomerate mass settlement and desliming effect under low consumption condition, the full iron recovery of sorting gained concentrate and grade are all comparatively excellent; Compared with prior art, under other technological parameter same cases, adopt flocculant of the present invention can make the full iron recovery of gained concentrate improve 5～20%, full iron grade improves 5～10%.
The present invention also provides a kind of oolitic hematite selectively to disperse the agglomerate method for separating simultaneously, technique is simple, and mog requires low, and owing to adopted flocculant provided by the invention, being able within a short period of time fine bloodstone mineral can be by efficient mass settlement, and full iron recovery is protected; Simultaneously, because flocculant possesses stronger adsorption capacity, so that dispersant weakens the impact of flocculating effect, even if dispersant dosage is higher, flocculant consumption of the present invention also can be significantly less than the flocculant use amount of prior art; The inventive method has overcome the deficiency that existing flocculation process need to carry out under the high alkalinity condition, be a kind of technique that can carry out under low alkalinity or ore pulp nature pH condition, and is light to the corrosivity harm of equipment; Difficulty low-grade during the method is applicable to, the microfine embedding step is selected the oolitic hematite sorting, adopts the inventive method, and the rate of recovery of gained bloodstone can be not less than 90%, and concentrate grade can be not less than 52%.
The specific embodiment
The present invention is described in further detail below in conjunction with the specific embodiment.
One, preparation flocculant, as follows operation:
A, CMS, acrylic acid, initator, crosslinking agent and deionized water are mixed, get mixed material;
The temperature to 70 of b, rising mixed material～90 ℃, and under stirring condition, be incubated 3 ~ 6 hours, must contain the flocculant of CMS and PAA graft;
C, primary purification: described mixed system is carried out being dried to constant weight about 50 ℃ after suction filtration, the washing in vacuum drying oven, get crude product;
D, secondary purify: crude product is mixed with methyl alcohol and carry out the Soxhlet extracting, then vacuum drying extracting gained solid obtains required flocculant to constant weight under 60 ℃ of temperature in not being higher than, and described flocculant is methyl starch and the PAA graft of purifying.
Two, detect the percent grafting of CMS and PAA graft copolymer
Method is: the percent grafting that calculates its CMS and PAA graft copolymer by formula (1).
(1) percent grafting: (M
1-M
o)/M
o* 100%, wherein, M
oThe quality of CMS, M
1It is the quality of graft copolymer after purifying.
Three, select viscosimetry to measure the molecular weight of graft copolymer, its cardinal principle is the feature viscosity (η) with the sodium chloride weak solution of Ubbelohde viscosity measurement graft copolymer, calculates its molecular weight by feature viscosity (η) and the relational expression (2) of molecular weight (M) again:
(2) M=802×[η]
1.25
Embodiment 1
Prepare flocculant by above-mentioned steps, wherein:
Each amounts of components is respectively CMS 10% by weight percentage among the step a, acrylic acid 50%, initator 0.5%, crosslinking agent 0.01%, deionized water 39.49%; Rising mixed material temperature to 70 ℃ among the step b is incubated 3 hours; During the Soxhlet extracting, crude product and methyl alcohol weight ratio are 2.5 in the steps d, and the extracting time is 24 h, obtains at last flocculant product.
The percent grafting that calculates product is 75.25%, and the molecular weight of graft copolymer is 6.45 * 10
5
Embodiment 2
Operate by embodiment 1 step, difference is: mixed material is that the percentage by weight of deionized water 29.15% mixes by CMS 30%, acrylic acid 40%, initator 1.0%, crosslinking agent 0.05% and surplus, rising mixed material temperature to 80 ℃ is incubated 4 hours.
The percent grafting that calculates at last product is 84.30%, and the molecular weight of graft copolymer is 1.749 * 10
6
Embodiment 3
Operate by embodiment 1 step, difference is: mixed material is pressed CMS 35%, acrylic acid 40%, initator 2.0%, crosslinking agent 0.1% and surplus are that the percentage by weight of deionized water 22.90% mixes, and rising mixed material temperature to 90 ℃ is incubated 6 hours.
The percent grafting that calculates product by formula (1) is 92.45%, and the molecular weight that calculates graft copolymer by formula (2) is 2.639 * 10
6
Two, oolitic hematite is selectively disperseed the agglomerate sorting:
Embodiment 4
1, raw ore source: Yichang oolitic hematite stone, TFe content are 48.12wt%; SiO
2Content is 13.22wt%;
2, take by weighing the 1000g ore to be milled to-0.074mm(is that granularity is less than 0.074mm) mineral aggregate account for the 85wt% of raw ore gross weight, additional proportion is that the sodium metasilicate of 100g/ton raw ore and sodium carbonate and raw ore that ratio is 100g/ ton raw ore grind altogether in the grinding process;
3, get ore grinding gained material, add water and size mixing that to make the contained mass fraction of solids of ore pulp be 15%, the rear stirring 5min that sizes mixing fully disperses the bloodstone suspended substance in ore pulp;
4, a sedimentation desliming: add the prepared flocculant of embodiment 1 in the ore pulp, the flocculant consumption is the 80g/ ton, and after mixing, standing sedimentation to mineral syrup liquid no longer descends, and then siphon removes the upper strata suspension, gets rough concentrate;
5, secondary settlement desliming: rough concentrate returned size mixing after regrinding, get the rough concentrate ore pulp, after adding the made flocculant of embodiment 1 in the rough concentrate ore pulp and mix in the ratio of 1 gram/ton raw ore, standing sedimentation to mineral syrup liquid no longer descends, then siphon removes the upper strata suspension, gets concentrate.Recording its productive rate is 77%, TFe grade 55.25wt%, and the TFe rate of recovery is 88.41%.
Embodiment 5
1, Hunan Ningxiang oolitic hematite stone, raw ore TFe content is 43.26wt%, SiO
2Content is 20.38wt%;
2, take by weighing the 1000g ore to be milled to-0.074mm(is that granularity is less than 0.074mm) mineral aggregate account for the 90wt% of raw ore gross weight, add the sodium metasilicate of 500g/ton raw ore and sodium carbonate and the raw ore of 1000g/ ton raw ore in the grinding process and grind altogether;
3, get ore grinding gained material, add water and size mixing that to make the contained mass fraction of solids of ore pulp be 15%, the rear stirring 5min that sizes mixing fully disperses the bloodstone suspended substance in ore pulp;
4, add the prepared flocculant of embodiment 3 in the ore pulp, the flocculant consumption is 100g/ ton raw ore, and after mixing, then the described mixed ore pulp of high intensity magnetic separation obtains magnetic material and non-magnetic separation material; The described magnetic material of flotation, the mode of flotation is that described magnetic material is carried out reverse flotation, during reverse flotation, in ore pulp, add the starch (starch is as the valuable mineral inhibitor) of 300 grams/ton raw ore consumption and the enuatrol (enuatrol is as collecting agent in reverse floatation) of 100 grams/ton raw ore consumption, all the other technological parameters are with reference to prior art, obtain flotation froth and floatation underflow, described floatation underflow is iron ore concentrate.
Recording the iron ore concentrate productive rate is 60.35%, TFe grade 57.42wt%, and the TFe rate of recovery is 80.10%.
Embodiment 6
Present embodiment operates with reference to embodiment 4, and difference is:
In the step 2: to be granularity account for the 80wt% of raw ore gross weight less than the mineral aggregate of 0.074mm to the ore grinding degree, adds the sodium metasilicate of 500g/ton raw ore and sodium carbonate and the raw ore of 300g/ ton raw ore during ore grinding in the grinding process and grind altogether; The contained mass fraction of solids of ore pulp is 20% in the step 3; The flocculant that adds embodiment 3 preparations in the step 4; The flocculant consumption is the 20g/ ton; Add the made flocculant of embodiment 3 in the step 5, the flocculant consumption is 10g/ ton raw ore.
Present embodiment gained concentrate yield is 75.12%, TFe grade 55.11wt%, and the TFe rate of recovery is 86.03%.
Embodiment 7
Present embodiment operates with reference to embodiment 4, and difference is:
In the step 2: to be granularity account for the 70wt% of raw ore gross weight less than the mineral aggregate of 0.074mm to the ore grinding degree, adds the sodium metasilicate of 200g/ton raw ore and sodium carbonate and the raw ore of 300g/ ton raw ore during ore grinding in the grinding process and grind altogether; The contained mass fraction of solids of ore pulp is 10% in the step 3; The flocculant that adds embodiment 2 preparations in the step 4; The flocculant consumption is the 50g/ ton; Add the made flocculant of embodiment 3 in the step 5, the flocculant consumption is 20g/ ton raw ore.
Present embodiment gained concentrate yield is 76.05%, TFe grade 55.03wt%, and the TFe rate of recovery is 86.97%.
Need to prove at last; above embodiment only is used for technical scheme of the present invention is described and unrestricted; although with reference to preferred embodiment technical scheme of the present invention is had been described in detail; those skilled in the art are to be understood that; can make amendment or be equal to replacement technical scheme of the present invention; and not breaking away from aim of the present invention and scope, it all should be encompassed in the middle of protection scope of the present invention.
Claims (10)
1. oolitic hematite flocculant is characterized in that: be to adopt following steps to make:
A, get CMS, acrylic acid, initator, crosslinking agent and deionized water and mix, get mixed material; In the mixed material, the percentage by weight of each component is respectively: CMS 10～20%, and acrylic acid 50～60%, initator 0.5～2%, crosslinking agent 0.01～0.1%, surplus is deionized water;
The temperature to 70 of b, rising mixed material～90 ℃ are incubated 3 ~ 6 hours under the stirring condition, must contain the mixed system of CMS and PAA graft;
C, primary purification: described mixed system is carried out being dried to constant weight after suction filtration, the washing under vacuum and 50～70 ℃ of temperature, get crude product;
D, secondary are purified: crude product is mixed at least 20h of also Soxhlet extracting with methyl alcohol, then in the solid that is not higher than vacuum drying extracting gained under 60 ℃ of temperature to constant weight, obtain methyl starch and the PAA graft of purifying, described purifying graft is flocculant required for the present invention; During the Soxhlet extracting, the weight ratio of methyl alcohol and crude product is not less than 2.
2. oolitic hematite flocculant according to claim 1, it is characterized in that: described initator is persulfate, described crosslinking agent is epoxychloropropane or glycerine.
3. oolitic hematite flocculant according to claim 1 and 2, it is characterized in that: the molecular weight of described graft is 1 * 10
3～1 * 10
7
4. oolitic hematite selectively disperses the agglomerate method for separating, it is characterized in that: comprise the steps:
1. ore grinding is sized mixing: oolitic hematite raw ore and dispersant are ground altogether make fineness account for 70～90% of raw ore weight less than the ore content of 0.074mm, then add water and size mixing, get ore pulp;
2. a sedimentation desliming: after adding described flocculant in the ore pulp and mixing, standing sedimentation to mineral syrup liquid no longer descends, and then the upper strata suspension is separated with the lower floor ore pulp, gets rough concentrate;
3. secondary settlement desliming: rough concentrate returned size mixing after regrinding, get the rough concentrate ore pulp, after adding described flocculant in the rough concentrate ore pulp and mix in the ratio of 1～20 gram/ton raw ore, standing sedimentation to mineral syrup liquid no longer descends, then the upper strata suspension is separated with the lower floor ore pulp, get concentrate.
5. oolitic hematite according to claim 4 selectively minute spreads the agglomerate method for separating, it is characterized in that: ore grinding is sized mixing when the mass fraction of solids of gained ore pulp is 10～15%, sedimentation desliming in the step, and the flocculant consumption is 20～100 grams/ton raw ore.
6. oolitic hematite according to claim 5 selectively disperses the agglomerate method for separating, it is characterized in that: the mass fraction of solids of rough concentrate ore pulp is 10～15%, and when secondary settlement took off, the consumption of flocculant was 10～50 grams/ton raw ore.
According to claim 5 or 6 described oolitic hematites selectively disperse the agglomerate method for separating, it is characterized in that: described dispersant comprises that consumption is that 100～500 grams/ton sodium carbonate of raw ore and consumption are the sodium metasilicate of 100～1000 grams/ton raw ore.
8. oolitic hematite according to claim 7 selectively disperses the agglomerate method for separating, it is characterized in that: step 3. in behind the coarse concentrate regrinding, the ore content that fineness is lower than 0.074mm accounts for 90～95% of the contained ore gross weight of rough concentrate.
9. oolitic hematite according to claim 8 selectively disperses the agglomerate method for separating, it is characterized in that: sodium carbonate amount is 500 grams/ton raw ore, and the sodium metasilicate consumption is 800 grams/ton raw ore.
10. oolitic hematite according to claim 9 selectively disperses the agglomerate method for separating, it is characterized in that: during a sedimentation desliming, the flocculant consumption is 50 grams/ton raw ore, and the flocculant consumption is 20 grams/ton raw ore during the secondary settlement desliming.
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Cited By (7)
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| CN104190549A (en) * | 2014-09-03 | 2014-12-10 | 鞍钢集团矿业公司 | Composite inhibitor for reverse flotation of hematite |
| CN104998763A (en) * | 2015-08-17 | 2015-10-28 | 华北理工大学 | Determining method for flocculating flotation granularity of micro-fine particle inbuilt hematite ores |
| CN105536979A (en) * | 2015-12-16 | 2016-05-04 | 陈均宁 | Method for extracting micro-fine-particle iron ore concentrate from tailings obtained after primary iron separation |
| CN106238218A (en) * | 2016-08-09 | 2016-12-21 | 鞍钢集团矿业有限公司 | A kind of filter aid for hematite concentrates solid-liquid separation and preparation method thereof |
| CN109290072A (en) * | 2018-09-27 | 2019-02-01 | 山东理工大学 | A kind of spodumene mine selective flocculation-Desliming method |
| CN112774869A (en) * | 2020-12-25 | 2021-05-11 | 厦门紫金矿冶技术有限公司 | Pyrite inhibitor, preparation thereof and application thereof in copper-lead-zinc multi-metal sulfide ores |
| CN113713968A (en) * | 2021-08-30 | 2021-11-30 | 东北大学 | In-situ online characterization method for structural characteristics of micro-fine particle iron mineral aggregate |
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| CN101439316A (en) * | 2008-11-27 | 2009-05-27 | 中南大学 | Selective flocculation desiliconisation method against low aluminum silicon ratio bauxite |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104190549A (en) * | 2014-09-03 | 2014-12-10 | 鞍钢集团矿业公司 | Composite inhibitor for reverse flotation of hematite |
| CN104998763A (en) * | 2015-08-17 | 2015-10-28 | 华北理工大学 | Determining method for flocculating flotation granularity of micro-fine particle inbuilt hematite ores |
| CN104998763B (en) * | 2015-08-17 | 2017-04-12 | 华北理工大学 | Determining method for flocculating flotation granularity of micro-fine particle inbuilt hematite ores |
| CN105536979A (en) * | 2015-12-16 | 2016-05-04 | 陈均宁 | Method for extracting micro-fine-particle iron ore concentrate from tailings obtained after primary iron separation |
| CN106238218A (en) * | 2016-08-09 | 2016-12-21 | 鞍钢集团矿业有限公司 | A kind of filter aid for hematite concentrates solid-liquid separation and preparation method thereof |
| CN106238218B (en) * | 2016-08-09 | 2019-03-29 | 鞍钢集团矿业有限公司 | A kind of filter aid and preparation method thereof being separated by solid-liquid separation for hematite concentrates |
| CN109290072A (en) * | 2018-09-27 | 2019-02-01 | 山东理工大学 | A kind of spodumene mine selective flocculation-Desliming method |
| CN112774869A (en) * | 2020-12-25 | 2021-05-11 | 厦门紫金矿冶技术有限公司 | Pyrite inhibitor, preparation thereof and application thereof in copper-lead-zinc multi-metal sulfide ores |
| CN112774869B (en) * | 2020-12-25 | 2022-09-16 | 厦门紫金矿冶技术有限公司 | Pyrite inhibitor, preparation thereof and application thereof in copper-lead-zinc multi-metal sulfide ores |
| CN113713968A (en) * | 2021-08-30 | 2021-11-30 | 东北大学 | In-situ online characterization method for structural characteristics of micro-fine particle iron mineral aggregate |
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