CN103586146A - Mineral processing process for processing mixed ore of magnetic iron ore and hematite-limonite ore - Google Patents
Mineral processing process for processing mixed ore of magnetic iron ore and hematite-limonite ore Download PDFInfo
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Abstract
The invention relates to a mineral processing process for processing mixed ore of magnetic iron ore and hematite-limonite ore. The mineral processing process comprises steps as follows: raw ore containing the mixed ore of the magnetic iron ore and the hematite-limonite ore is smashed and then subjected to two-stage continuous ore grinding; overflowing ore of a secondary classifying cyclone is subjected to two-stage low-intensity magnetic separation and one-stage fine screening and separation in combination of a single magnetic separation, fine screening and regrinding process for processing magnetic ore; under the condition of rougher ground ore particles, a part of undersize qualified magnetite concentrate products are firstly obtained, the other part of oversize products are combined with one-stage high-intensity magnetic separator concentrate and two-stage low-intensity magnetic separator tailings to serve as middlings, and the middlings are subjected to three-stage ore grinding classification operation for regrinding and separation; and overflowing ore of a tertiary classifying cyclone is subjected to three-stage low-intensity magnetic separation and high-intensity magnetic separation, fine-grain qualified tailings are thrown again, three-stage low-intensity magnetic concentrate and two-stage high-intensity magnetic concentrate are combined to obtain mixed magnetic concentrate, the mixed magnetic concentrate is subjected to a reverse flotation process for separation, and a qualified flotation concentrate product is obtained. According to the mineral processing process, the mixed ore of the magnetic iron ore and the hematite-limonite ore with different dissemination particle sizes is reasonably processed, the qualified iron ore concentrate product is obtained, and the mineral processing process is economical, energy-saving and environment-friendly.
Description
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Technical field
The invention belongs to iron ore and sort technical field, particularly a kind of ore-dressing technique of processing magnetic, red mixed ore.
background technology:
Due to constantly riseing of Ore Imported price, how reasonably to utilize China existing ore resource ，Dui China steel and iron industry to there is very real and great meaning.
There is a kind of main mixed ore containing magnetic iron ore and hematite-limonite, its head grade is lower, only have 30.02%, wherein hematite-limonite content is more, accounts for 50.89% of all iron content, next is ferromagnetism magnetic iron ore, account for 32.28% of all iron content, account in addition weak illusion, half martite of magnetic of all iron content 11.03%, containing a small amount of ferric carbonate and ferrosilite, S, P objectionable impurities are less, and gangue mineral is mainly quartzy.Process such magnetic, red mixed ore and generally adopt the magnetic-flotation process of stage (or continuously) ore grinding-thickness grading-weight, magnetic, floating joint process or stage (or continuously) ore grinding-weak magnetic-by force.But by the research to this mixed ore character, this strongly magnetic mineral magnetic iron ore disseminated grain size mixing in ore deposit is relatively thick, 38 microns of average out to, the disseminated grain size of hematite-limonite is relatively thin, 20 microns of average out to.Sorting test research to this mixed ore shows, this ore adopts Continuous Grinding-thickness grading-weight, magnetic, floating joint process to process, hematite-limonite in the coarse fraction part of its thickness grading is because its disseminated grain size is thinner, iron mineral, compared with not reaching monomer dissociation under coarseness, adopts the gravitational separation equipment spiral chute in original technique can not obtain qualified gravity concentrate product.
Magnetic separation tube sorting test result to this ore shows, under thicker grinding particle size-200 order 85% condition, its magnetic separation tube concentrate reaches more than 62%, under grinding particle size-200 order 90% condition, magnetic separation tube concentrate reaches more than 65%, and the strongly magnetic mineral in this ore can obtain qualified magnetic concentrate by single weak magnetic separation process.The technique of processing strongly magnetic mineral adopts single magnetic separation or single magnetic separation, dusting cover regrinding process flow process conventionally, and single magnetic separation, dusting cover regrinding process are the more advanced economical and energy saving technological processes of processing magnetic iron ore.As the magnetic ore deposit part of this mixed ore adopted to single magnetic separation, dusting cover regrinding process, process, under its sieve, can obtain a part of qualified concentrate containing product, and its oversize must pass through regrinding and reconcentration, but in this mixed ore, magnetic iron ore part needs after dusting cover upgrading on the sieve of regrinding and reconcentration that productive rate is less only has 12%; Hematite-limonite in the weakly magnetic tailings of this mixed ore after low intensity magnetic separations not other part also needs further fine grinding just can make it reach the monomer dissociation of iron mineral simultaneously; This part hematite-limonite part as adopt separately weak magnetic-strong magnetic-reverse floatation process to process in addition, its reverse flotation only has 34% to ore deposit grade is lower, the reverse floatation process of now processing magnetic, red mixed ore to ore deposit grade all more than 42%.
Summary of the invention
The object of this invention is to provide a kind of energy consumption of regrinding that reduces, reduce floating agent dosage, realize in ore dressing and early receive and early throw optimum ore dressing principle, energy-saving and cost-reducing, reduce the processing magnetic of beneficiation cost, the ore-dressing technique of red mixed ore.
The present invention is a kind of ore-dressing technique of processing magnetic, red mixed ore, it is characterized in that comprising the following steps:
A) by the raw ore after the mixed ore fragmentation containing magnetic iron ore and hematite-limonite, feed the closed circuit grinding that one section of ball mill and scalping a cluster cyclone form, the overflow that the granularity of scalping cyclone is-200 orders 60% feeds secondary grading a cluster cyclone, be classified into two kinds of materials of overflow and sand setting thickness, the sand setting of secondary grading a cluster cyclone classification is fed to two sections of ball mill ore grindings, two sections of ball milling ore discharges return to secondary grading a cluster cyclone, and a little less than the overflow granularity of swirl flow device component level reaches-200 orders 85% and feeds two sections, magnetic machine and one section strong magnetic machine sort;
B) raw ore is by after two sections of Continuous Grindings, and the overflow of swirl flow device component level is sorted and made a little less than in the of two sections magnetic machine concentrate grade reach this ore deposit to enter to sieve more than 62% requirement of grade by magnetic machine a little less than two sections,
A little less than a little less than in the of one section, magnetic machine concentrate feeds two sections, magnetic machine sorts, and two sections of inferior fine magnetite concentrates reach more than 62%; A little less than in the of one section, magnetic tail ore deposit feeds one section strong magnetic machine, the productive rate 23% of dishing out, the strong magnetic tail ore deposit of grade 7.5%;
C) adopt dusting cover upgrading, a little less than grade after magnetic machine a little less than in the of two sections sorts reaches more than 62% two sections, magnetic machine concentrate feeds the electromagnetic high frequency shaking fine screen that screen size is 0.10mm, and the grade of electromagnetic high frequency shaking fine screen is more than 65.5%, productive rate 11% undersize is a part of final concentrate product;
D) chats merges regrinding and reconcentration.
By the concentrate of one section of strong magnetic machine, this three parts chats merging of the oversize that a little less than in the of two sections, magnetic tail ore deposit and electromagnetic high frequency shaking fine screen granularity are-200 orders 72% feeds together three sections of ball mills and regrinds, three sections of ball milling ore discharges feed classifying cyclone group three times, the sand setting of three classifying cyclone groups returns to three sections of ball mills, a little less than the overflow that the granularity of three classifying cyclone groups is-200 orders 95% feeds three sections, magnetic machine selects again, a little less than in the of its three sections, magnetic tail ore deposit feeds two sections strong magnetic machines and throws tail, the productive rate 20.5% of further dishing out, the qualified strong magnetic tail of the particulate ore deposit of grade 11%, and magnetic machine concentrate and two sections strong magnetic machine concentrate merge the mixed magnetic essence that grade is 43% and feed reverse flotation work as reverse flotation to ore deposit a little less than in the of three sections.
Compared with prior art, the invention has the beneficial effects as follows:
1, effectively processed that magnetic iron ore and hematite-limonite disseminated grain size differ larger magnetic, red mixed ore has obtained qualified concentrate containing product;
2, by processing magnetic iron ore, organically combine with two kinds of advanced technologies processing hematite-limonite, existing effect single magnetic separation, the dusting cover upgrading flow process of the processing magnetic iron ore technique of economic environmental protection and energy saving, realized again the strong magnetic throwing of the particulate tail of processing hematite-limonite, mixed magnetic essence reverse flotation obtains the advantage of weak magnetic-strong magnetic-reverse floatation process flow process of qualified concentrate containing product;
3, first under thicker grinding particle size condition, adopt magnetic separation-dusting cover to obtain a part of qualified magnetic concentrate, reduced the ore grinding ore deposit amount of regrinding, saved power consume, this part ore has avoided employing reverse flotation method to sort simultaneously, both saved floating agent dosage, and reduced the pollution problem of floating agent, reduced beneficiation cost;
4, after dusting cover oversize and two sections of weakly magnetic tailingses and one section of high intensity magnetic mineral merge and feed regrind mill and regrind as chats, after weak magnetic-high-intensity magnetic separation, feeding reverse flotation sorts, not only having solved oversize needs the key issue of regrinding and reconcentration, and this part high-grade ore amount improved reverse flotation to ore deposit grade, optimized reverse flotation to ore deposit condition.
Accompanying drawing explanation
Fig. 1 is for processing the mineral processing circuit figure of magnetic, red mixed ore.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, according to a kind of ore-dressing technique of processing magnetic, red mixed ore of the present invention, it is characterized in that comprising the following steps:
A) by the raw ore after the mixed ore fragmentation containing magnetic iron ore and hematite-limonite, feed the closed circuit grinding that one section of ball mill and scalping a cluster cyclone form, the overflow of granularity-200 order 60% of scalping a cluster cyclone classification overflow feeds secondary grading a cluster cyclone, be classified into two kinds of materials of overflow and sand setting thickness, the sand setting of secondary grading a cluster cyclone classification is fed to two sections of ball mill ore grindings, two sections of ball millings return to secondary grading a cluster cyclone, and a little less than the overflow granularity of swirl flow device component level reaches-200 orders 85% and feeds two sections, magnetic machine and one section strong magnetic machine sort;
B) raw ore is by after two sections of Continuous Grindings, and the overflow of swirl flow device component level is sorted and made a little less than in the of two sections magnetic machine concentrate reach this ore deposit to enter to sieve more than 62% requirement of grade by magnetic machine a little less than two sections,
A little less than a little less than in the of one section, magnetic machine concentrate feeds two sections, magnetic machine sorts, and two sections of inferior fine magnetite concentrates reach more than 62%; A little less than in the of one section, magnetic tail ore deposit feeds one section strong magnetic machine, the productive rate 23% of dishing out, the strong magnetic tail ore deposit of grade 7.5%;
C) adopt dusting cover upgrading, grade after magnetic machine a little less than in the of two sections sorts reaches a little less than more than 62% two sections magnetic machine concentrate, and to feed screen size be 0.10mm electromagnetic high frequency shaking fine screen, and the grade of electromagnetic high frequency shaking fine screen is more than 65.5%, productive rate 11% undersize is final concentrate.
Adopt electromagnetic high frequency shaking fine screen first to obtain a part of qualified magnetic concentrate, make this part ore avoid employing reverse flotation method to sort, saved floating agent dosage, not only reduced and sorted cost, and reduced the pollution problem of floating agent.
D) chats merges regrinding and reconcentration,
Thick-200 orders 72% of electromagnetic high frequency shaking fine screen folding oversize granularity, grade is lower is 57%, must just can obtain qualified final concentrate through regrinding and reconcentration; One section of high intensity magnetic mineral grade is lower is 26%, productive rate 48%, and in this part high intensity magnetic mineral, contained hematite-limonite disseminated grain size is thinner, needs regrinding and reconcentration just can obtain qualified concentrate containing product; Magnetic tail mineral products rate 5% left and right nearly a little less than in the of other two sections, and grade is higher more than 30%, is difficult for directly dishing out as mine tailing, is also necessary regrinding and reconcentration.
Therefore, the present invention is by the concentrate of one section of strong magnetic machine, a little less than in the of two sections, this three parts chats of magnetic tail ore deposit and electromagnetic high frequency shaking fine screen oversize merges and feeds together three sections of ball mills and regrind, three sections of ball milling ore discharges feed classifying cyclone group three times, the sand setting of three classifying cyclone groups returns to three sections of ball mills, a little less than the overflow that the granularity of three classifying cyclone groups is-200 orders 95% feeds three sections, magnetic machine selects again, a little less than in the of its three sections, magnetic tail ore deposit feeds two sections strong magnetic machines and throws tail, the productive rate 20.5% of further dishing out, the particulate qualified tailings of grade 11%, and magnetic machine concentrate and two sections strong magnetic machine concentrate merge the mixed magnetic essence that grade is 43% and feed and return flotation operation to ore deposit as reverse flotation a little less than in the of three sections.
After the present invention regrinds chats, by high intensity magnetic separation, dish out and reach in a large number the qualified fine tailings of monomer dissociation again, for follow-up reverse flotation provides qualified floating to product;
A little less than in the of three sections, magnetic machine concentrate and two sections strong magnetic machine concentrate merge the mixed magnetic essence that grade is 43% and feed and return flotation operation to ore deposit as reverse flotation, through a reverse flotation thick, that an essence, three is swept, sort, the qualified grade of final acquisition reaches more than 65%, the concentrate through reverse flotation of productive rate 23.5%, grade is below 19%, the reverse flotation mine tailing of productive rate 22% is abandoned as true tailings.
The present invention organically combines single magnetic separation, this ore of dusting cover regrinding process flow processing of processing magnetic iron ore, can be under thicker grinding particle size condition, first obtain the lower qualified magnetite concentrate product of part sieve, another part oversize again with ore in weak magnetic mineral merge to feed and regrind, regrind product magnetic and one section of high-intensity magnetic separation a little less than one section again after fine grinding, the fine tailings of dishing out again, inferior fine magnetite concentrate and high intensity magnetic mineral are merged into mixed magnetic essence and are fed reverse floatation process and sort and obtain qualified flotation concentrate product, and reverse flotation mine tailing is abandoned as true tailings.Dusting cover undersize and concentrate through reverse flotation are merged into final qualified concentrate containing, and two sections of strong magnetic tail ore deposits and flotation tailing are merged into comprehensive mine tailing.
Adopt two sections of Continuous Grindings of the present invention, weak magnetic-dusting cover, chats is regrinded, weak magnetic-strong magnetic-reverse floatation process flow processing magnetic, red mixed ore, final head grade 30.5%, concentrate yield 34.12%, the concentrate grade 65.25 of obtaining, metal recovery rate 72.99%, the good mineral processing index of comprehensive tailings grade 12.50%.
Claims (1)
1. process an ore-dressing technique for magnetic, red mixed ore, it is characterized in that comprising the following steps:
A) by the raw ore after the mixed ore fragmentation containing magnetic iron ore and hematite-limonite, feed the closed circuit grinding that one section of ball mill and scalping a cluster cyclone form, the overflow of granularity-200 order 60% of scalping a cluster cyclone classification overflow feeds secondary grading a cluster cyclone, be classified into two kinds of materials of overflow and sand setting thickness, the sand setting of secondary grading a cluster cyclone classification is fed to two sections of ball mill ore grindings, two sections of ball millings return to secondary grading a cluster cyclone, and a little less than the overflow granularity of swirl flow device component level reaches-200 orders 85% and feeds two sections, magnetic machine and one section strong magnetic machine sort;
B) raw ore is by after two sections of Continuous Grindings, and the overflow of swirl flow device component level is sorted and made a little less than in the of two sections magnetic machine concentrate reach this ore deposit to enter to sieve more than 62% requirement of grade by magnetic machine a little less than two sections;
A little less than a little less than in the of one section, magnetic machine concentrate feeds two sections, magnetic machine sorts, and two sections of inferior fine magnetite concentrates reach more than 62%; A little less than in the of one section, magnetic tail ore deposit feeds one section strong magnetic machine, the productive rate 23% of dishing out, the strong magnetic tail ore deposit of grade 7.5%;
C) adopt dusting cover upgrading, a little less than grade after magnetic machine a little less than in the of two sections sorts reaches more than 62% two sections, magnetic machine concentrate feeds the electromagnetic high frequency shaking fine screen that screen size is 0.10mm, and the grade of electromagnetic high frequency shaking fine screen is more than 65.5%, productive rate 11% undersize is a part of final concentrate;
D) chats merges regrinding and reconcentration,
By the concentrate of one section of strong magnetic machine, this three parts chats merging of the oversize that a little less than in the of two sections, magnetic tail ore deposit and electromagnetic high frequency shaking fine screen granularity are-200 orders 72% feeds together three sections of ball mills and regrinds, three sections of ball milling ore discharges feed classifying cyclone group three times, the sand setting of three classifying cyclone groups returns to three sections of ball mills, a little less than the overflow that the granularity of three classifying cyclone groups is-200 orders 95% feeds three sections, magnetic machine selects again, a little less than in the of its three sections, magnetic tail ore deposit feeds two sections strong magnetic machines and selects, the productive rate 20.5% of further dishing out, the particulate qualified tailings of grade 11%, and magnetic machine concentrate and two sections strong magnetic machine concentrate merge the mixed magnetic essence that grade is 43% and feed reverse flotation work as reverse flotation to ore deposit a little less than in the of three sections.
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| CN104888947A (en) * | 2015-06-12 | 2015-09-09 | 鞍钢集团矿业公司 | Magnetic separation-centrifuge separation technology of micro-fine particle dissemination magnet-hematite mixed ore |
| CN105855019A (en) * | 2016-05-24 | 2016-08-17 | 中国地质科学院郑州矿产综合利用研究所 | Ultrafine crushing-grading magnetic separation method for magnetite |
| CN106076606A (en) * | 2016-08-10 | 2016-11-09 | 中钢集团马鞍山矿山研究院有限公司 | A kind of beneficiation method of the red Complex iron ore of magnetic |
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| CN106513163A (en) * | 2016-10-14 | 2017-03-22 | 鞍钢集团矿业有限公司 | High-pressure rolling and magnetic-gravity separation process for lean hematite |
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