CN105195304A - Sorting process for improving quality and reducing impurities of low-grade magnetite concentrate - Google Patents
Sorting process for improving quality and reducing impurities of low-grade magnetite concentrate Download PDFInfo
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Abstract
The invention provides a sorting process for improving quality and reducing impurities of low-grade magnetite concentrate, aiming at solving the technical problems that magnetic separation equipment is complicated, the production cost is high and the water utilization amount is great. With the adoption of the technical scheme, the process is realized based on column type magnetic separation equipment. The process is characterized by comprising sorting of iron ore concentrate 1, efficient concentration of grade-I gangues, backwater utilization and treatment and treatment of grade-II gangues; the advanced column type magnetic separation equipment 1 is used for improving the quality and reducing the impurities of the low-grade magnetite concentrate; by adopting efficient concentration equipment to treat overflowing gangues of the column type magnetic separation equipment, the circulating utilization rate of water is improved and the concentration of the gangues is greatly improved, so that the utilization quantity of concentration magnetic separators is reduced; and a tower mill is used for carrying out open-circuit grinding and magnetic separation equipment 2 is used for finely selecting, so that the efficient recycling of valuable minerals in the overflowing gangues of the column type magnetic separation equipment 1 is realized.
Description
Technical field
The present invention relates to the upgrading of a kind of low-grade magnetic concentrate and fall assorted sorting process, the magnetic concentrate of genus magnetic mineral sorting technology field, particularly a kind of high-efficiency water-saving, optimized production process saving production equipment is put forward physique and is fallen assorted sorting process.
Background technology
Columnar magnetic, gravitational separation equipment divide to choose at magnetic mineral with the performance of its excellence and are widely used.In past technique, people due to the research of araeosystyle electromagnetism, gravitational separation equipment application advantage less, generally be equal to common magnetic separator when design and use, not do not provide a special design and solution according to the feature of this kind equipment, thus cause the advantage of this kind equipment can not give full play in production system, all the time cannot solve the large problem of production system water consumption, and water consumption is large, production equipment and the complicated problem of operation have become its bottleneck problem that can be used widely of restriction.
Such as the overflow tailings glass of columnar magnetic, gravitational separation equipment, factory is selected generally to adopt magnetic separator or salvaging machine to reclaim mine tailing or directly to selected factory tailings glass system.Because pillar electromagnetism, gravitational separation equipment tailings concentration are low, its weight percent concentration is between 2-5%, and slurry volume amount is large.Need a large amount of use magnetic separator or the machine of salvaging on the one hand, on the other hand, the tailing water of magnetic separator or the process of the machine of salvaging can not because solid content exceeds standard directly be added water use as pillar electromagnetism, gravitational separation equipment, re-use after must entering the process of plant tailing treatment system, causing tailing water to recycle expense increases.
China Patent Publication No. is that 104226476A discloses the upgrading of a kind of microfine magnet fine powder and selects technique again, the mine tailing of microfine magnet fine powder after Full-automatic magnetic suspension selecting machine process directly have employed concentrated magnetic separator and processes, the tailing water of concentrated magnetic separator contains solid particulate matter impurity, directly cannot use as industrial water, need to carry out processing through concentrator again to obtain qualified industrial water.Because the overflow mine tailing pulp density of Full-automatic magnetic suspension selecting machine only has 2%-5%, volume is very large, cost enormous investment is needed to support the use a large amount of concentrated magnetic separator equipment, the more important thing is, concentrated magnetic separator only has the overflow mining tailing efficiency of the Full-automatic magnetic suspension selecting machine of 2%-5% very low to concentration, cause race tail serious.
Need adopting the sorting process of columnar magnetic optional equipment to make improvement, the technical problem that magnetic plant is complicated, production cost is high to solve, water consumption is large for above-mentioned phenomenon.
Summary of the invention
The present invention solves the technical problem that magnetic plant is complicated, product cost is high, water consumption is large, provides the upgrading of a kind of low-grade magnetic concentrate to fall assorted sorting process, realizes falling assorted to the upgrading of low-grade magnetic concentrate by adopting advanced columnar magnetic optional equipment 1; By adopting the cyclic utilization rate of the overflow mine tailing raising water of efficient concentration device processes columnar magnetic optional equipment, increasing substantially tailings concentration to reduce the usage quantity of concentrated magnetic separator; By adopt tower grinding machine open-circuit grinding and columnar magnetic optional equipment 2 selected, realize valuable mineral high efficiente callback in araeosystyle magnetic plant 1 overflow mine tailing.
The present invention is the technical scheme realizing goal of the invention employing:
Assorted sorting process falls in the upgrading of a kind of low-grade magnetic concentrate, described technique realizes based on columnar magnetic optional equipment, key is that described technique comprises the sorting of iron ore concentrate 1, I level mine tailing efficient concentration, recycling water utilization process and mine tailing II process, and concrete steps comprise:
1) be 10% ~ 50% by weight percent concentration, granularity is less than 0.3 millimeter of low-grade magnetic concentrate pulp being greater than 10 microns and feeds columnar magnetic optional equipment 1, after columnar magnetic optional equipment 1 sorts, obtain the iron ore concentrate 1 of concentration >=60%, grade lifting amplitude 2-10%, the rate of recovery >=95%, and overflow obtains the I level mine tailing that weight percent concentration is 2 ~ 5%;
2) above-mentioned overflow I level mine tailing is fed efficient concentration equipment, after concentrated, directly recycled as industrial water by the overflow water of solids content≤300 mg/litre, solid particle maximum gauge≤10 micron, the II level mine tailing of weight percent concentration >=20% of generation is directly thrown tail or carries out reprocessing.
The present invention is by feeding efficient concentration equipment by columnar magnetic optional equipment 1 overflow mine tailing (weight percent concentration 2-5%), after concentrated, underflow II level tailings concentration is greater than 20%, II level mine tailing volume reduces more than 70%, if the underflow II level mine tailing of 20% concentration is directly thrown tail and is entered plant tailing treatment system, because volume is little can not affect plant tailing treatment system balance, do not need to carry out great amount of investment or transformation to tailings glass system; If carry out reprocessing to II level mine tailing, columnar magnetic optional equipment overflow mine tailing of comparing over directly feeds the technique of concentrated magnetic separator, and its pulp volume amount reduces about 70%, significantly decreases the use amount of concentrated magnetic separator or spoil reclaming magnetic separator equipment on the one hand; 20% tailings concentration meets concentrated magnetic separator normal operation requirement on the other hand, is conducive to the recovery of magnetic separator to valuable mineral, prevents from running tail in a large number.Concentrated magnetic separator or spoil reclaming magnetic separator mine tailing fall assorted useless the entering of sorting process true tailings throwing as the upgrading of low-grade Armco magnetic iron concentrate and select the comprehensive tailings glass system of factory.
Below in conjunction with accompanying drawing, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1: the underflow mine tailing after efficient concentration equipment concentrates is directly as the true tailings last person;
Fig. 2: the underflow tailings glass mode one after efficient concentration equipment concentrates;
Fig. 3: the underflow tailings glass mode two after efficient concentration equipment concentrates.
Detailed description of the invention
Referring to Fig. 1, assorted sorting process falls in the upgrading of a kind of low-grade magnetic concentrate, described technique realizes based on columnar magnetic optional equipment, and key is: described technique comprises the sorting of iron ore concentrate 1, I level mine tailing efficient concentration, recycling water utilization process and II level tailings glass, and concrete steps comprise:
1) be 10% ~ 50% by weight percent concentration, granularity is less than 0.3 millimeter of low-grade magnetic concentrate pulp being greater than 10 microns and feeds columnar magnetic optional equipment 1, after columnar magnetic optional equipment 1 sorts, obtain the iron ore concentrate 1 of concentration >=60%, grade lifting amplitude 2-10%, the rate of recovery >=95%, and overflow obtains the I level mine tailing that weight percent concentration is 2 ~ 5%;
2) above-mentioned overflow I level mine tailing is fed efficient concentration equipment, after concentrated, directly recycled as industrial water by the overflow water of solids content≤300 mg/litre, solid particle maximum gauge≤10 micron, the II level mine tailing of weight percent concentration >=20% of generation is directly thrown tail or carries out reprocessing.
Described step 2) in produce overflow water as industrial water by water pump feed columnar magnetic optional equipment 1,2 as add water formed closed cycle utilize, wherein recirculated water utilization rate >=70%, insufficient section needs to add new water and accounts for 25% ~ 30%.
Described step 2) in produce overflow water add whole industrial water system as industrial water by water pump.
Described step 2) in II level mine tailing feed spoil reclaming magnetic separator, the concentrate product selecting magnetic separator to obtain again directly feeds tower grinding machine and regrinds, and tower grinding machine ore discharge directly feeds columnar magnetic optional equipment 2 and sorts and obtain iron ore concentrate 2 and sort the qualified iron ore concentrate 2 obtaining grade 50% ~ 66%.
Described step 2) in II level mine tailing can directly to entering ore dressing plant tailings glass system or feeding spoil reclaming magnetic separator, then the grinding operation that the concentrate product selecting magnetic separator to obtain directly returns original production system carries out regrinding and reconcentration.
Described columnar magnetic optional equipment 1, II can be that electromagnetism eluriates refiner, refiner is eluriated in magnetic suspension, magnetic accumulating machine, column magnetic separator, elutriation magnetic separator, magnetic suspension selecting machine, grade elevator, in magnetic flotation post one or both and combine above.
Described efficient concentration equipment can be in high-efficiency concentrator, lamella thickener, pipe chute thickener, incline board concentrating box, hydrocyclone one or both and combine above.
Columnar magnetic optional equipment 1, columnar magnetic optional equipment 2 and efficient concentration equipment are all provided with the pressure transmitter for detecting pulp density or concentration, for adjusting the electric control valve of underflow density or the Pulp pump with speed-regulating function, and for regulating the electric control valve of new water and circulating water flow.
Described pressure transmitter is arranged on the bottom of described equipment or top, middle part and bottom or top and bottom or middle part and bottom.
The PLC system that transmitter, electric control valve or Pulp pump arrangements for speed regulation and columnar magnetic optional equipment 1, columnar magnetic optional equipment 2 configure connects and composes equipment running status and process automatic control system.
With columnar magnetic, gravitational separation equipment, Hhigh-efficient thickener and the equipment such as spoil reclaming magnetic separator, tower grinding machine form high grade iron concentrate the sorting process sorted, add concentration technology that water efficient circulation utilizes and the mill that selects again of tailing regrind and select technique can significantly Optimizing Flow, save operating cost.Namely this technique can be used for newly-built concentrate upgrading plant, also can be used for old improvement of dressing process.
First low-grade for certain concentration iron ore concentrate is fed columnar magnetic optional equipment 1, columnar magnetic optional equipment 1 is by magnetic field force and the gravity of iron ore own and spiral current are sheared and the acting in conjunction of Float upward function power, the low-grade intergrowth of non magnetic ore and weak magnetic is taken out of from top overflow, bottom concentrate pipe can directly obtain concentrate concentration >=60%, grade promotes 2-10%, the qualified iron ore concentrate of metal recovery rate >=95%.
The described concentration technology adding the utilization of water efficient circulation refers to that columnar magnetic optional equipment overflow mine tailing feeds efficient concentration equipment, after efficient concentration effect, the efficient concentration equipment overflow water yield accounts for and feeds more than 70% of mine tailing total Water, overflow water solids content≤300 mg/litre, solid particle maximum gauge≤10 micron, water quality meets industrial process waters standard, directly adds to columnar magnetic optional equipment 1 or ore dressing plant industrial water system as time water purification.
What the magnetic separator that described tailing regrind selects technique to comprise efficient concentration equipment underflow was again elected to be the Regrinding of industry, again concentrate selection and ore milling product again selects system again, the low-grade intergrowth of part in columnar magnetic optional equipment mine tailing can be made to reach abundant monomer dissociation and guarantee that valuable mineral reclaims to greatest extent by regrinding and reconcentration operation, sufficiently lower tailings grade.
Invention effectively can improve concentrate grade, reduce tailings grade, improve metal recovery rate, reduce metal loss, rationally utilize recirculated water efficiently, be conducive to enterprise and improve the competitiveness of product in market, energy-saving and cost-reducing, create environment-friendly and green mine, improve social environment, the sustainable development of promoting enterprise and society.
The present invention to the particular/special requirement of ore deposit, moisturizing and concentrate, tailings glass, proposes a set of columnar magnetic, gravitational separation equipment as the design of picking equipment in technological process and application process in conjunction with columnar magnetic, gravitational separation equipment.The present invention is realized by following technical proposals:
(1) granularity is less than 0.3 millimeter of low-grade Armco magnetic iron concentrate pulp being greater than 10 microns and feeds columnar magnetic optional equipment 1 under certain weight percent concentration (10%-50%), concentration >=60% can be obtained after columnar magnetic optional equipment 1 sorts, grade promotes amplitude 2-10%, the iron ore concentrate 1 of the rate of recovery >=95%.
(2) iron ore concentrate 1 of columnar magnetic optional equipment 1 output, concentration can control to more than 60%, can cancel or reduce the use number of units of iron ore concentrate concentration technology equipment, comprise the concentrated of concentrated magnetic separator and thickener, directly can feed dry concentrate that dehydration and filter plant obtain moisture up to standard and also can feed concentrate concentrated phase conveying system and realize long-range conveying.
(3) by columnar magnetic optional equipment 1 overflow mine tailing, weight percent concentration 2-5%, feeds efficient concentration equipment, and after concentrated, solids content≤300 mg/litre in overflow water, solid particle maximum gauge≤10 micron, meet industrial water water quality requirement.This overflow water can directly recycle as industrial water.70% can be economized on water.Specifically comprise following two kinds of processing schemes:
Scheme 1: feed columnar magnetic optional equipment by water pump and recycle as adding water " closed circuit ".Recirculated water utilization rate >=70%, insufficient section needs to add new water and accounts for 25% ~ 30%.
Scheme 2: columnar magnetic optional equipment 1,2 all uses new water as adding water as final concentrate equipment of checking on, more be conducive to the lifting of mineral processing index, columnar magnetic optional equipment 1,2 overflow mine tailing adds whole industrial water system as systemic circulation water by water pump after overflow water after efficient concentration equipment is concentrated.Comparatively speaking, columnar magnetic optional equipment 1,2 adds water system is that " open circuit " runs.
(4) efficient concentration equipment concentrate after underflow tailing regrind select technique to comprise following three kinds of processing schemes again:
Scheme 1(accompanying drawing 1): the underflow mine tailing after efficient concentration equipment concentrates is directly as the true tailings last person;
Scheme 2(accompanying drawing 2): the underflow mine tailing after efficient concentration equipment concentrates feeds spoil reclaming magnetic separator, then the concentrate product selecting magnetic separator to obtain directly feeds tower grinding machine and regrinds, and tower grinding machine ore discharge directly feeds columnar magnetic optional equipment and sorts and obtain concentrate 2;
Scheme 3(accompanying drawing 3): the underflow mine tailing after efficient concentration equipment concentrates feeds spoil reclaming magnetic separator, then the grinding operation that the concentrate product selecting magnetic separator to obtain directly returns original production system carries out regrinding and reconcentration.
(5) columnar magnetic optional equipment 1 overflow mine tailing (weight percent concentration 2-5%) is fed efficient concentration equipment, after concentrated, underflow tailings concentration is greater than 20%, mine tailing volume reduces more than 70%, the underflow mine tailing of 20% concentration is directly thrown tail as processed by such scheme 1 and is entered plant tailing treatment system, because volume is little can not affect plant tailing treatment system balance.Do not need to carry out great amount of investment or transformation to tailings glass system.If press such scheme 2,3 to process mine tailing, the ore pulp amount of the technique of comparing over (columnar magnetic optional equipment overflow mine tailing directly feeds concentrated magnetic separator) reduces about 70%, significantly decreases concentrated magnetic separator (or spoil reclaming magnetic separator) equipment use amount on the one hand; 20% tailings concentration meets magnetic separator normal operation requirement on the other hand, is conducive to the recovery of magnetic separator to valuable mineral, prevents from running tail in a large number.Concentrated magnetic separator (or spoil reclaming magnetic separator) mine tailing falls assorted useless the entering of sorting process mine tailing throwing as the upgrading of low-grade Armco magnetic iron concentrate and selects the comprehensive tailings glass system of factory.
(6) mill that tailing regrind selects again selects the underflow tailings glass scheme 2 of technique that underflow mine tailing is fed spoil reclaming magnetic separator, magnetic separator concentrate directly feeds tower grinding machine open-circuit grinding, tower grinding machine concentrate directly feeds columnar magnetic optional equipment 2 below, can obtain relative high-quality concentrate 2 after columnar magnetic optional equipment sorts.Columnar magnetic optional equipment 2 overflow mine tailing through adding the concentration technology that water efficient concentration recycles, adds water reusable edible again.Technique of selecting the mill selected again by tailing regrind effectively can reclaim the valuable mineral in mine tailing.
(7) mill that tailing regrind selects again selects the underflow tailings glass scheme 3 of technique that underflow is fed spoil reclaming magnetic separator, magnetic concentrate directly returns the grinding operation of original system, after regrinding and reconcentration, feed columnar magnetic optional equipment 1, after columnar magnetic optional equipment 1 sorts, obtain concentrate 1.Tailings glass scheme 3, because have the weakly magnetic mineral of part release mesh and lean intergrowth to circulate in systems in which existence, can affect concentrate 1 grade 0.2% to 0.5%.Advantage is the reduction of the investment of tailings glass equipment.
(8) columnar magnetic optional equipment 1, columnar magnetic optional equipment 2, efficient concentration equipment is on the top of equipment, middle part, bottom is provided with the transmitter owing to detecting pulp density (or concentration), for adjust underflow density the electric control valve Pulp pump of speed-regulating function (or with) and for regulating the electric control valve of new water and circulating water flow, for columnar magnetic optional equipment 1, columnar magnetic optional equipment 2, efficient concentration its upper side, middle part, the transmitter (in minimum of applications three one or two) owing to detecting pulp density (or concentration) that bottom is installed, for adjusting the electric control valve Pulp pump of speed-regulating function (or with) of underflow density and connecting and composing automatic control system for the electric control valve and PLC system regulating new water and circulating water flow.
Advantage of the present invention is:
1. propose the columnar magnetic of complete set, gravitational separation equipment to ore deposit, moisturizing, concentrate, tailings glass scheme.More economical compared with original operation, reasonable.70% can be economized on water.Economize on electricity, saving equipment investment and operating cost successful.
2. optimize columnar magnetic, gravitational separation equipment running environment, equipment is run more stable.
3. propose columnar magnetic, gravitational separation equipment and peripheral equipment decentralized detection centralized Control new concept, whole magnetic iron ore selecting system is run more efficient, stable.
Present applicant proposes a few cover columnar magnetic, gravitational separation equipment Tailing thickening, again choosing and tailing water operational version, user according to Ge Xuan factory technique actual requirement, can combinationally use in actual use.
Claims (10)
1. assorted sorting process falls in low-grade magnetic concentrate upgrading, described technique realizes based on columnar magnetic optional equipment, it is characterized in that: described technique comprises the sorting of iron ore concentrate 1, I level mine tailing efficient concentration, backwater comprehensive utilization process and II level tailings glass, and concrete steps comprise:
1) low-grade magnetic concentrate pulp is fed columnar magnetic optional equipment 1, after columnar magnetic optional equipment 1 sorts, obtain iron ore concentrate 1, and overflow obtains I level mine tailing;
2) above-mentioned overflow I level mine tailing is fed efficient concentration equipment, after concentrated, overflow water directly recycles as industrial water, and the II level mine tailing of generation is directly thrown tail or carries out reprocessing.
2. assorted sorting process falls in a kind of low-grade magnetic concentrate according to claim 1 upgrading, it is characterized in that: described step 2) in produce overflow water as add water by water-delivery pump feed columnar magnetic optional equipment 1 formed closed cycle utilize, wherein recirculated water utilization rate >=70%, insufficient section needs to add new water and accounts for 25% ~ 30%.
3. assorted sorting process falls in a kind of low-grade magnetic concentrate according to claim 1 upgrading, it is characterized in that: described step 2) in produce overflow water add whole industrial water system as industrial water by water-delivery pump.
4. assorted sorting process falls in a kind of low-grade magnetic concentrate according to claim 2 upgrading, it is characterized in that: described step 2) in II level mine tailing feed spoil reclaming magnetic separator, the concentrate product selecting magnetic separator to obtain again directly feeds tower grinding machine and regrinds, and tower grinding machine ore discharge directly feeds columnar magnetic optional equipment 2 and sorts the qualified iron ore concentrate 2 obtaining grade 50% ~ 66%.
5. assorted sorting process falls in a kind of low-grade magnetic concentrate according to claim 2 upgrading, it is characterized in that: described step 2) in II level mine tailing can directly to entering ore dressing plant tailings glass system or feeding spoil reclaming magnetic separator, then the grinding operation that the concentrate product selecting magnetic separator to obtain directly returns original production system carries out regrinding and reconcentration.
6. assorted sorting process falls in a kind of low-grade magnetic concentrate according to claim 4 upgrading, it is characterized in that: described columnar magnetic optional equipment 1,2 can be that electromagnetism eluriates refiner, refiner is eluriated in magnetic suspension, magnetic accumulating machine, column magnetic separator, elutriation magnetic separator, magnetic suspension selecting machine, grade elevator, in magnetic flotation post one or both and combine above.
7. assorted sorting process falls in a kind of low-grade magnetic concentrate according to claim 1 upgrading, it is characterized in that: described efficient concentration equipment can be in high-efficiency concentrator, lamella thickener, pipe chute thickener, incline board concentrating box, hydrocyclone one or both and combine above.
8. assorted sorting process falls in a kind of low-grade magnetic concentrate according to claim 5 upgrading, it is characterized in that: the pressure transmitter for detecting pulp density or concentration is all installed on columnar magnetic optional equipment 1, columnar magnetic optional equipment 2 and efficient concentration equipment, for adjusting the electric control valve of underflow density or the Pulp pump with speed-regulating function, and for regulating the electric control valve of new water and circulating water flow.
9. assorted sorting process falls in a kind of low-grade magnetic concentrate according to claim 8 upgrading, it is characterized in that: described pressure transmitter is arranged on the bottom of described equipment or top, middle part and bottom or top and bottom or middle part and bottom.
10. assorted sorting process falls in a kind of low-grade magnetic concentrate according to claim 8 upgrading, it is characterized in that: the PLC system that transmitter, electric control valve or Pulp pump arrangements for speed regulation and columnar magnetic optional equipment 1, columnar magnetic optional equipment 2 configure connects and composes equipment running status and process automatic control system.
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| CN106378256A (en) * | 2016-11-27 | 2017-02-08 | 玉溪大红山矿业有限公司 | Method for improving quality and reducing silicon content of mixed type lean iron magnetic concentrate |
| CN106959606A (en) * | 2016-01-08 | 2017-07-18 | 石家庄金垦科技有限公司 | Dynamic equalization regulation and control method in concentrate sorting system |
| CN107694745A (en) * | 2017-11-15 | 2018-02-16 | 中冶北方（大连）工程技术有限公司 | A kind of elutriation magnetic separator tailing treatment technology |
| CN108816497A (en) * | 2018-06-15 | 2018-11-16 | 魏建民 | Magnetite beneficiation process |
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