CN107335535B - Efficient beneficiation method for low-grade refractory titanomagnetite - Google Patents
Efficient beneficiation method for low-grade refractory titanomagnetite Download PDFInfo
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Abstract
The invention discloses a high-efficiency beneficiation method for low-grade refractory titanomagnetite, which comprises a crushing step of crushing the low-grade refractory titanomagnetite; grinding the crushed titanomagnetite and carrying out cyclone classification to obtain fine particle overflow I and coarse particle ore pulp I, and regrinding the coarse particle ore pulp I and returning to the first stage of grinding classification step; a first-stage low-intensity magnetic separation step of performing low-intensity magnetic separation on the fine particle overflow I to obtain iron concentrate slurry I and tailing slurry I; a screening and grading step of screening the iron concentrate pulp I to obtain oversize coarse ore and undersize fine ore pulp; merging the iron concentrate ore pulp I and oversize coarse ore into cyclone classification II to obtain fine particle overflow II and coarse ore pulp II, grinding the coarse ore pulp II again and returning the ground coarse ore pulp II to the second stage ore grinding classification step of the cyclone classification II; and a second-stage low-intensity magnetic separation step of carrying out low-intensity magnetic separation on the fine particle overflow II to obtain iron concentrate slurry II and tailing slurry II. The invention aims at low-grade refractory titanomagnetite, combines cyclone classification and low-intensity magnetic separation to improve the recovery rate of iron and titanium, and has the characteristics of simple process, easy operation and high beneficiation efficiency.
Description
Technical Field
The invention belongs to the technical field of ferrous metal beneficiation, and particularly relates to an efficient beneficiation method for low-grade refractory titanomagnetite, which is simple in process, easy to operate, low in cost, high in beneficiation efficiency and iron and titanium recovery rate.
Background
Over 95% of the iron ore reserves in China are lean ores, and the average grade is only about 32.00%. Due to the restriction of technical level and economic benefit, on one hand, a large amount of ultra-lean extrafine ores and lean miscellaneous ore ores stripped from most of the existing iron mines in the mining process are piled up and not utilized, and on the other hand, a large amount of ultra-lean iron ores are not developed and utilized yet. With the rapid development of the iron and steel industry, iron ore resources with good geological conditions, high resource grade and good separation property are nearly exhausted, so that the resource utilization of low-grade iron ore is imminent, which has important significance for exploiting the potential of iron ore resources, improving the security degree of iron ore resource guarantee in China and the like.
However, the utilization of low-grade iron ore has the following technical problems.
(1) The iron grade of low-grade ore is extremely low, the near-ore surrounding rock and the ore are in a gradual change relationship, the boundary line between the ore and the surrounding rock is unclear, the grade of the selected ore is generally improved by only 2 percent by adopting the mature bulk dry magnetic separation tailing discarding or bulk jigging technology, the tailing discarding amount is small, and the loss of iron metal is large.
(2) In the mining process, the ore loss rate and the waste rock mixing rate are difficult to control, so that the grade of the selected ore is difficult to control.
(3) Because the iron grade of the ore is low, the ore is relatively difficult to grind and is difficult to select, and the ore dressing ratio is large, if the conventional ore dressing technology is adopted for treatment, the ore concentrate cost is high, and the economic benefit of the mine is poor or loss is caused.
(4) Because of the limitation of the separation principle of dry magnetic separation equipment, the dry magnetic separation tailing discarding effect of ores under the condition of finer granularity is poor, and at present, no mature high-efficiency wet magnetic separation equipment suitable for discarding tailings of fine and broken products exists.
For poor magnetite with lower grade, most magnetite concentration plants at home and abroad adopt a coarse grain dry magnetic separation tailing discarding method, and a large amount of tailings are discarded before raw ore is ground, so that the aims of improving treatment capacity, improving concentration grade and reducing production cost are fulfilled. However, for the ultra-lean magnetite ore with a grade of about 20% or less, the separation effect of the dry magnetic separator is not ideal when the grade difference between the ore and the surrounding rock is small because the grade is extremely low and the iron mineral has a fine embedded particle size.
In the prior art, the strong magnetic pre-selection process has a very important meaning for magnetite in terms of energy conservation, consumption reduction, effective utilization of extremely poor iron ore and improvement of the quality of final iron ore concentrate. However, the strong magnetic preselection equipment has strong magnetic agglomeration effect on the separation of magnetite due to higher magnetic field strength and larger magnetic field force, so that magnetic impurities and non-magnetic impurities exist, so that the concentrate contains more gangue, and the concentrate grade is seriously influenced. In order to solve the magnetic and non-magnetic inclusion caused by the strong magnetic separation equipment, the pole number of a cylindrical magnetic separator is increased, the magnetic field intensity of a concentrate end is properly reduced, and washing water is added into a concentrate end box body; develops a vibration magnetic separator, a pulsating magnetic field, a rotating magnetic field magnetic separator and the like. However, the methods have the disadvantages that the amplitude for improving the iron grade of the magnetic field concentrate is not high, usually only 0.5-1.5%, the process flow is long and complicated, the middling circulation is too large, the consumption is high, and the ore dressing cost is high.
At present, the principle of 'selecting iron first and then selecting titanium' or 'grinding and separating iron and titanium together' is generally adopted for the mineral separation of the titanomagnetite and the vanadium titanomagnetite. The principle of 'first selecting iron and then selecting titanium' comprises an iron ore production line and a titanium ore production line which are relatively independent from each other, and minerals with low iron content after being processed by the iron ore production line enter the titanium ore production line for continuous processing, so that the problems of long ore dressing process, more equipment configuration, high construction investment and management operation cost and the like exist; in the principle of 'iron and titanium co-grinding and sorting', the sorting of iron ores and titanium ores is basically and synchronously carried out, and in the ore grinding step, the granularity control of minerals has a difficult problem, so that the phenomenon of over-grinding and mud-forming of the ilmenite is serious, the minerals in the mineral particles cannot be well recovered, and the utilization rate of titanium resources is low.
In the low-grade titanomagnetite, the crude ore of Kunzi jade river village iron ore contains about 20% of iron, belongs to low-grade ore, the harmful element in the ore is P, and the content of titanium dioxide is about 5%. The main metal minerals of the raw ore comprise magnetite, titanomagnetite, gangue minerals such as amphibole, askeite, chlorite and the like. Through observation under a mirror, single mineral chemical analysis, artificial heavy sand analysis and X-diffraction analysis, iron in the ore has two occurrence states: the composition is characterized in that magnetite, ilmenite and a small amount of limonite (hematite) exist in the form of independent minerals; a natural substance exists in pyroxene, hornblende, little biotite and chlorite. The raw ore mineral composition is observed under a mirror, analyzed by artificial heavy sand and analyzed by X-ray diffraction, and 17 minerals such as oxide, silicate, sulfide and phosphate exist in the ore. The silicate is mainly 76 percent plus or minus of the ore; the oxide is secondary and accounts for 17.2 percent plus or minus of the ore; phosphate accounts for 6.7% of the ore; the sulfide is small in amount. Wherein the iron and titanium ore mineral accounts for 16.2% of the ore. The Kunzi jade river village iron ore belongs to typical low-grade and refractory titanomagnetite. Therefore, the beneficiation method for the low-grade refractory titanomagnetite with simple and economic process and high beneficiation efficiency and iron and titanium recovery rate is provided, and the utilization rate of iron ore resources and the economic benefit of enterprises can be improved.
Disclosure of Invention
The invention aims to provide an efficient beneficiation method for low-grade refractory titanomagnetite, which has the advantages of simple process, easy operation, low cost, high beneficiation efficiency and high iron and titanium recovery rate.
The purpose of the invention is realized as follows: the method comprises the steps of crushing, first-stage ore grinding classification, first-stage low-intensity magnetic separation, screening classification, second-stage ore grinding classification and second-stage low-intensity magnetic separation, and specifically comprises the following steps:
A. crushing: crushing low-grade refractory titanomagnetite raw ore to the granularity of-10 mm;
B. first-stage grinding and grading: grinding the crushed titanomagnetite I to ore pulp with fineness of-200 meshes, accounting for more than 70% and concentration of 25-35%, performing cyclone classification I to obtain fine particle overflow I and coarse particle ore pulp I, regrinding the coarse particle ore pulp I through an ore grinding II, and returning to the cyclone classification I;
C. first-stage low-intensity magnetic separation: carrying out low intensity magnetic separation I on the fine particle overflow I after cyclone classification I to obtain iron concentrate pulp I and tailing pulp I, wherein the magnetic induction intensity of the low intensity magnetic separation I is 150-220 mT;
D. screening and grading: screening the tailing slurry I obtained in the step C by using a sieve with the aperture of 2mm to obtain oversize coarse ore and undersize tailing slurry, and discarding tailings of the undersize tailing slurry;
E. secondary grinding and grading: combining the iron concentrate ore pulp I obtained in the step C with the oversize coarse ore obtained in the step D, and then carrying out cyclone classification II to obtain fine particle overflow II with the fineness of 200 meshes accounting for more than 95% and coarse particle ore pulp II, and returning the coarse particle ore pulp II to the cyclone classification II after grinding III and regrinding;
F. two-stage low-intensity magnetic separation: and E, carrying out low intensity magnetic separation II on the fine particle overflow II obtained in the step E to obtain iron concentrate slurry II and tailing slurry II, and discarding the tailing slurry II.
Aiming at the characteristics that the iron mineral of the low-grade refractory magnetite has fine embedded granularity and the grade difference between the ore and the surrounding rock is small, the invention has little iron metal loss and does not have mature high-efficiency wet magnetic separation equipment suitable for discarding the tailings of fine crushed products for the dry magnetic separation discarding tailings and the large jigging discarding tailings commonly adopted in the prior art; and the strong magnetic preselection tailing discarding effect is good, but the magnetite sorting has strong magnetic agglomeration effect due to higher magnetic field strength and larger magnetic field force, so that magnetic impurities and non-magnetic impurities exist, the concentrate contains more gangue, the concentrate grade is seriously influenced, and the like. The invention adopts the cross combination technical scheme of multi-stage grinding cyclone classification and multi-stage weak magnetic separation, optimizes and combines the technical parameters of each stage, reduces the magnetic agglomeration effect when the magnetic separation equipment separates, and reduces the influence of magnetic inclusion and non-magnetic inclusion, thereby effectively reducing the gangue in the iron ore concentrate and improving the recovery rate of iron elements and the grade of the ore concentrate through multi-stage weak magnetic separation. Compared with the traditional difficult problems that the granularity of minerals is difficult to control in the step of grinding and sorting iron and titanium together, so that the phenomenon of over-grinding and mud-forming of ilmenite is serious, and the minerals in the mineral particles cannot be well recovered, the invention adopts multi-stage grinding to gradually refine the minerals, and is matched with a crossed multi-stage weak magnetic separation process, and through the matching of one-stage grinding and grading with one-stage weak magnetic separation, a small amount of ilmenite with weak magnetism and high hardness, magnetite with strong magnetism and low hardness and titanomagnetite can be separated from each other, so that the phenomenon of over-grinding and mud-forming caused by the generation of over-fine mineral particles in the later stage of grinding treatment of minerals with larger hardness difference is avoided to influence the recovery, and simultaneously, a large amount of tailings are thrown, the purposes of reducing the treatment amount of later stage grinding and weak magnetic separation are achieved, the production cost. And then, the magnetite and titanomagnetite particles with stronger magnetism are magnetically separated from the iron concentrate slurry I subjected to the low-intensity magnetic separation at one end so as to effectively improve the iron grade of the iron concentrate by more than 50%. Therefore, the method has the characteristics of simple process, easy operation, low cost, high beneficiation efficiency and high iron and titanium recovery rate.
Drawings
FIG. 1 is one of the schematic process flows of the present invention;
FIG. 2 is a second schematic process flow diagram of the present invention;
in the figure: 1-grinding I, 2-grinding II, 3-grinding III.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to limit the invention in any way, and any variations or modifications which are based on the teachings of the invention are intended to be within the scope of the invention.
As shown in fig. 1 and 2, the method comprises the steps of crushing, first-stage ore grinding and classification, first-stage low-intensity magnetic separation, screening and classification, second-stage ore grinding and classification and second-stage low-intensity magnetic separation, and specifically comprises the following steps:
A. crushing: crushing low-grade refractory titanomagnetite raw ore to the granularity of-10 mm;
B. first-stage grinding and grading: grinding the crushed titanomagnetite I to ore pulp with fineness of-200 meshes, accounting for more than 70% and concentration of 25-35%, performing cyclone classification I to obtain fine particle overflow I and coarse particle ore pulp I, regrinding the coarse particle ore pulp I through an ore grinding II, and returning to the cyclone classification I;
C. first-stage low-intensity magnetic separation: carrying out low intensity magnetic separation I on the fine particle overflow I after cyclone classification I to obtain iron concentrate pulp I and tailing pulp I, wherein the magnetic induction intensity of the low intensity magnetic separation I is 150-220 mT;
D. screening and grading: screening the tailing slurry I obtained in the step C by using a sieve with the aperture of 2mm to obtain oversize coarse ore and undersize tailing slurry, and discarding tailings of the undersize tailing slurry;
E. secondary grinding and grading: combining the iron concentrate ore pulp I obtained in the step C with the oversize coarse ore obtained in the step D, and then carrying out cyclone classification II to obtain fine particle overflow II with the fineness of 200 meshes accounting for more than 95% and coarse particle ore pulp II, and returning the coarse particle ore pulp II to the cyclone classification II after grinding III and regrinding;
F. two-stage low-intensity magnetic separation: and E, carrying out low intensity magnetic separation II on the fine particle overflow II obtained in the step E to obtain iron concentrate slurry II and tailing slurry II, and discarding the tailing slurry II.
And B, grinding the titanomagnetite to ore pulp with the fineness of 200 meshes accounting for more than 50%, then screening to obtain undersize ore pulp with the fineness of 200 meshes accounting for more than 70% and oversize coarse ore, carrying out cyclone classification on the undersize ore pulp I, and returning the oversize coarse ore to be ground by the grinding I.
And D, performing strong magnetic separation I on the undersize tailing slurry obtained in the step D with the magnetic induction intensity of 1-1.2T to obtain strong magnetic concentrate I and strong magnetic tailings I, wherein the strong magnetic concentrate I is combined into the iron concentrate slurry I, and the strong magnetic tailings I are subjected to tailing discarding.
And F, feeding the tailing slurry II obtained in the step F into a concentration device for concentration to obtain concentrated tailing slurry with the concentration not more than 5%, carrying out 1-2-level strong magnetic separation on the concentrated tailing slurry to obtain strong magnetic concentrate and strong magnetic tailings, merging the strong magnetic concentrate into the iron concentrate slurry II, and discarding the tailings.
And (3) performing strong magnetic separation II on the concentrated tailing slurry with the magnetic induction intensity of 1-1.2T to obtain strong magnetic concentrate II and strong magnetic tailing II, and combining the strong magnetic concentrate II into iron concentrate slurry II.
And performing strong magnetic separation III on the strong magnetic concentrate II with the magnetic induction intensity of 1.2-1.5T to obtain a strong magnetic concentrate III and a strong magnetic tailing III, wherein the strong magnetic concentrate III is combined into iron concentrate pulp II, and the strong magnetic tailing III is combined into strong magnetic tailing II for tailing discarding.
And D, the fineness I of the fine particle overflow obtained in the step B is-200 meshes, accounts for more than 75%, and the concentration is 15-20%.
The Fe grade of the low-grade refractory titanomagnetite raw ore is 17-23%, and the TiO content is2The grade is 4.5-6%, the P grade is not less than 1%, and the magnetite is not less than 50% in the total iron distribution rate.
The concentration of the iron concentrate slurry II is not less than 40% and the Fe grade is not less than 50%.
And feeding the iron concentrate pulp II into an elutriation magnetic separator to obtain elutriation concentrate and elutriation tailings with the concentration not less than 60%.
The water supply pressure of the elutriation magnetic separator is not less than 0.25MPa, the working voltage is 380v, and the magnetic field intensity is 0-300 Gs, and can be adjusted.
Example 1
As shown in FIG. 1, the raw ore of Yuhezhai iron ore has an iron grade of 19.29% and TiO2The grade is 5.03 percent, and the water content of the raw ore is 3.3 percent. The raw ore is selected according to the following steps:
s100: crushing the raw ore to the granularity of-10 mm by a PE900 multiplied by 1200 jaw crusher;
s200: performing semi-automatic grinding on crushed raw ore by a phi 5.5 multiplied by 1.8 semi-automatic closed-loop wet-type ore grinding machine to obtain ore pulp with fineness of-200 meshes accounting for more than 70% and concentration of 30.5%, classifying the ore pulp by a phi 350 hydrocyclone I to obtain fine particle overflow I and coarse particle ore pulp I with concentration of 17.4%, performing ball-milling wet regrinding on the coarse particle ore pulp I by a phi 3.2 multiplied by 5.4 ball mill, returning to the phi 350 hydrocyclone I, and classifying;
s300: carrying out low intensity magnetic separation I with the magnetic induction intensity of 200mT on the fine particle overflow I to obtain iron concentrate pulp I and tailing pulp I with the concentration of 35.2%;
s400: screening the tailing slurry I obtained in the previous step by a cylindrical sieve with the aperture of 2mm to obtain oversize coarse ore and undersize tailing slurry with the concentration of 14.64%, and discarding the undersize tailing slurry;
s500: combining the iron concentrate ore pulp I with oversize coarse ore, classifying by a phi 350 hydrocyclone II to obtain a fine particle overflow II with the concentration of 9.76% and the fineness of-200 meshes of more than 95% and a coarse ore pulp II, ball-milling the coarse ore pulp II by a phi 2.7 multiplied by 3.6 ball mill for wet regrinding, returning to the phi 350 hydrocyclone II, and classifying;
s600: and (3) carrying out low intensity magnetic separation II with the magnetic induction intensity of 100mT on the fine particle overflow II to obtain iron concentrate pulp II and tailing pulp II, feeding the tailing pulp II into a phi 24m concentration tank for concentration to obtain concentrated tailing pulp with the concentration of 2.68%, and discarding the tailing.
The iron concentrate slurry II obtained by industrially testing the raw iron ore of the Yuhezhai iron pyrite according to the steps has the concentration of 41.32 percent, the iron grade of 51.97 percent and TiO2Grade 14.76%, yield 18.22%, iron yield 49.09%, titanium yield 53.46%, and selection ratio 5.5; the concentration of the undersize tailing slurry of the S600 concentrated tailing slurry combined S400 is 6.9 percent, the iron grade is 12.01 percent, and TiO is2Grade 2.86% and yield 81.78%.
Example 2
As shown in FIG. 2, the iron grade of the raw ore of Yuhezhai iron ore is 21.37%, TiO2The grade is 4.95 percent, and the water content of the raw ore is 3.5 percent. The raw ore is selected according to the following steps:
s100: crushing the raw ore to the granularity of-10 mm by a PE900 multiplied by 1200 jaw crusher;
s200: performing semi-automatic grinding on crushed raw ore by a phi 5.5 multiplied by 1.8 semi-automatic closed-loop wet-type ore grinding machine to obtain ore pulp with fineness of-200 meshes accounting for more than 70% and concentration of 32.8%, classifying the ore pulp by a phi 350 hydrocyclone I to obtain fine particle overflow I and coarse particle ore pulp I with concentration of 18.3%, performing ball-milling wet regrinding on the coarse particle ore pulp I by a phi 3.2 multiplied by 5.4 ball mill, returning to the phi 350 hydrocyclone I, and classifying;
s300: carrying out low intensity magnetic separation I with the magnetic induction intensity of 150mT on the fine particle overflow I to obtain iron concentrate pulp I and tailing pulp I with the concentration of 35.9%;
s400: screening tailing slurry I through a cylindrical sieve with the aperture of 2mm to obtain oversize coarse ore and undersize tailing slurry, subjecting the undersize tailing slurry to strong magnetic separation I with the magnetic induction intensity of 1T to obtain strong magnetic concentrate I and strong magnetic tailing I, combining the oversize coarse ore and the strong magnetic concentrate I into iron concentrate slurry I, and discarding the strong magnetic tailing I;
s500: combining the iron concentrate pulp I and the strong magnetic concentrate I with oversize coarse ores, and classifying the mixture by a phi 350 hydrocyclone II to obtain a fine particle overflow II with the concentration of 10.48 percent and the fineness of-200 meshes accounting for more than 95 percent and a coarse particle pulp II, wherein the coarse particle pulp II is subjected to phi 2.7 multiplied by 3.6 ball milling wet type regrinding and then returns to the phi 350 hydrocyclone II for classification;
s610: carrying out low intensity magnetic separation II on the fine particle overflow II with the magnetic induction intensity of 80mT to obtain iron concentrate slurry II and tailing slurry II;
s620: and feeding the tailing slurry II into a phi 24m concentration tank for concentration to obtain concentrated tailing slurry with the concentration of 3.17%, performing strong magnetic separation II on the concentrated tailing slurry with the magnetic induction intensity of 1.2T to obtain strong magnetic concentrate II and strong magnetic tailing II, merging the strong magnetic concentrate II into the iron concentrate slurry II to obtain final iron concentrate slurry, and merging the strong magnetic tailing II with the strong magnetic tailing I for tailing discarding.
The concentration of the iron concentrate pulp finally obtained by industrially testing the raw iron ore of the iron pyrite of Yuhezhai village according to the steps is 43.51 percent, the iron grade is 53.25 percent, and TiO is2Grade 15.04%, yield 18.54%, iron yield 51.73%, titanium yield 54.51%, and the selection ratio is 5.4; the concentration of the merged tailing slurry is 6.72 percent, the iron grade is 11.66 percent, and TiO is2Grade 2.72% and yield 83.07%.
Example 3
As shown in FIG. 2, the iron grade of the raw ore of Yuhezhai iron ore is 18.86%, and TiO is25.11 percent of grade and 3.2 percent of water content of raw ore. The raw ore is selected according to the following steps:
s100: crushing the raw ore to the granularity of-10 mm by a PE900 multiplied by 1200 jaw crusher;
s210: performing semi-automatic grinding on the crushed raw ore by phi 5.5 multiplied by 1.8 to obtain ore pulp with fineness of-200 meshes accounting for more than 50%;
s220: screening the ore pulp obtained by the S210 ore grinding through a linear sieve to obtain undersize ore pulp and oversize coarse ore with the fineness of-200 meshes accounting for more than 70% and the concentration of 29.34%, and returning the oversize coarse ore to be subjected to semi-automatic grinding with the diameter of 5.5 multiplied by 1.8 to be subjected to closed wet type regrinding;
s230: classifying the undersize ore pulp by a phi 350 hydrocyclone I to obtain fine particle overflow I with the concentration of 17.06 percent and coarse particle ore pulp I, ball-milling the coarse particle ore pulp I by a phi 3.2 multiplied by 5.4 ball mill wet type regrinding, returning to the phi 350 hydrocyclone I, and classifying;
s300: carrying out low intensity magnetic separation I with the magnetic induction intensity of 220mT on the fine particle overflow I to obtain iron concentrate pulp I and tailing pulp I with the concentration of 34.83%;
s400: screening tailing slurry I through a cylindrical sieve with the aperture of 2mm to obtain oversize coarse ore and undersize tailing slurry, subjecting the undersize tailing slurry to strong magnetic separation I with the magnetic induction intensity of 1.2T to obtain strong magnetic concentrate I and strong magnetic tailing I, combining the oversize coarse ore and the strong magnetic concentrate I into iron concentrate slurry I, and discarding the tail of the strong magnetic tailing I;
s500: combining the iron concentrate pulp I and the strong magnetic concentrate I with oversize coarse ores, and classifying the mixture by a phi 350 hydrocyclone II to obtain a fine particle overflow II with the concentration of 9.28 percent and the fineness of-200 meshes accounting for more than 95 percent and a coarse particle pulp II, and returning the coarse particle pulp II to the phi 350 hydrocyclone II for classification after ball milling wet regrinding by a phi 2.7 multiplied by 3.6;
s610: carrying out low intensity magnetic separation II with the magnetic induction intensity of 150mT on the fine particle overflow II to obtain iron concentrate slurry II and tailing slurry II;
s620: feeding the tailing slurry II into a phi 24m concentration tank for concentration to obtain concentrated tailing slurry with the concentration of 2.85%, and performing strong magnetic separation II on the concentrated tailing slurry with the magnetic induction intensity of 1T to obtain strong magnetic concentrate II and strong magnetic tailing II;
s630: and (3) performing strong magnetic separation III on the strong magnetic concentrate II with the magnetic induction intensity of 1.2T to obtain a strong magnetic concentrate III and a strong magnetic tailing III, merging the strong magnetic concentrate III into an iron concentrate pulp II to obtain a final iron concentrate pulp, and merging the strong magnetic tailing III and the strong magnetic tailing II into a strong magnetic tailing I for tailing discarding.
According to the steps, the concentration of the iron concentrate pulp obtained by industrially testing the raw iron ore of the iron pyrite of Yuhezhai is 42.94 percent, the iron grade is 52.62 percent, and TiO is finally added2Grade 14.68%, yield 18.79%, iron yield 53.32%, titanium yield 52.84%, and selection ratio 5.3; the concentration of the merged tailing slurry is 6.47 percent, the iron grade is 10.32 percent, and TiO is2Grade 2.85% and yield 84.24%.
Example 4
As shown in FIG. 2, the iron grade of the raw ore of Yuhezhai iron ore is 22.67%, and TiO is2The grade is 4.75 percent, and the water content of the raw ore is 3.5 percent. The raw ore is selected according to the following steps:
s100: crushing the raw ore to the granularity of-10 mm by a PE900 multiplied by 1200 jaw crusher;
s210: performing semi-automatic grinding on the crushed raw ore by phi 5.5 multiplied by 1.8 to obtain ore pulp with fineness of-200 meshes accounting for more than 50%;
s220: screening the ore pulp obtained by the S210 ore grinding through a linear sieve to obtain undersize ore pulp and oversize coarse ore with the fineness of-200 meshes accounting for more than 70% and the concentration of 34.11%, and returning the oversize coarse ore to be subjected to semi-automatic grinding with the diameter of 5.5 multiplied by 1.8 to be subjected to closed wet type regrinding;
s230: classifying the undersize ore pulp by a phi 350 hydrocyclone I to obtain fine particle overflow I with the concentration of 19.31 percent and coarse particle ore pulp I, performing ball milling wet type regrinding on the coarse particle ore pulp I by a phi 3.2 multiplied by 5.4, returning to the phi 350 hydrocyclone I, and classifying;
s300: carrying out low intensity magnetic separation I with the magnetic induction intensity of 175mT on the fine particle overflow I to obtain iron concentrate pulp I and tailing pulp I with the concentration of 37.63%;
s400: screening tailing slurry I through a cylindrical sieve with the aperture of 2mm to obtain oversize coarse ore and undersize tailing slurry, subjecting the undersize tailing slurry to strong magnetic separation I with the magnetic induction intensity of 1.1T to obtain strong magnetic concentrate I and strong magnetic tailing I, combining the oversize coarse ore and the strong magnetic concentrate I into iron concentrate slurry I, and discarding the tail of the strong magnetic tailing I;
s500: combining the iron concentrate pulp I and the strong magnetic concentrate I with oversize coarse ores, and classifying the mixture by a phi 350 hydrocyclone II to obtain a fine particle overflow II with the concentration of 10.71 percent and the fineness of 200 meshes accounting for more than 95 percent and a coarse particle pulp II, and returning the coarse particle pulp II to the phi 350 hydrocyclone II for classification after ball milling wet regrinding by a phi 2.7 multiplied by 3.6;
s610: carrying out low intensity magnetic separation II with the magnetic induction intensity of 125mT on the fine particle overflow II to obtain iron concentrate slurry II and tailing slurry II;
s620: feeding the tailing slurry II into a phi 24m concentration tank for concentration to obtain concentrated tailing slurry with the concentration of 3.17%, and performing strong magnetic separation II on the concentrated tailing slurry with the magnetic induction intensity of 1.1T to obtain strong magnetic concentrate II and strong magnetic tailing II;
s630: and (3) performing strong magnetic separation III on the strong magnetic concentrate II with the magnetic induction intensity of 1.5T to obtain a strong magnetic concentrate III and a strong magnetic tailing III, merging the strong magnetic concentrate III into an iron concentrate pulp II to obtain a final iron concentrate pulp, and merging the strong magnetic tailing III and the strong magnetic tailing II into a strong magnetic tailing I for tailing discarding.
The concentration of the iron concentrate pulp obtained by industrially testing the raw iron ore of the iron pyrite of Yuhezhai village according to the steps is 43.64 percent, the iron grade is 54.16 percent, and TiO is finally obtained2Grade is 14.95%, yield is 19.68%, iron yield is 55.83%, titanium yield is 53.67%, and the selection ratio is 5.1; the concentration of the merged tailing slurry is 7.06 percent, the iron grade is 10.18 percent, and TiO is2Grade 2.77% and yield 83.61%.
Claims (8)
1. The efficient beneficiation method for the low-grade refractory titanomagnetite is characterized in that the Fe grade of raw low-grade refractory titanomagnetite is 17-23%, and TiO is2The grade is 4.5-6%, the P grade is not less than 1%, and the magnetite is not less than 50% in the total iron distribution rate; the beneficiation method comprises the steps of crushing, first-stage ore grinding classification, first-stage low-intensity magnetic separation, screening classification, second-stage ore grinding classification and second-stage low-intensity magnetic separation, and specifically comprises the following steps:
A. crushing: crushing low-grade refractory titanomagnetite raw ore to the granularity of-10 mm;
B. first-stage grinding and grading: grinding the crushed titanomagnetite I to ore pulp with fineness of-200 meshes, wherein the ore pulp accounts for more than 70% and the concentration is 25-35%, performing cyclone classification I to obtain fine particle overflow I and coarse particle ore pulp I, and regrinding the coarse particle ore pulp I through ore grinding II and returning to the cyclone classification I;
C. first-stage low-intensity magnetic separation: carrying out low intensity magnetic separation I on the fine particle overflow I after cyclone classification I to obtain iron concentrate pulp I and tailing pulp I, wherein the magnetic induction intensity of the low intensity magnetic separation I is 150-220 mT;
D. screening and grading: screening the tailing slurry I obtained in the step C by using a sieve with the aperture of 2mm to obtain oversize coarse ore and undersize tailing slurry, and discarding the undersize tailing slurry;
E. secondary grinding and grading: combining the iron concentrate ore pulp I obtained in the step C with the oversize coarse ore obtained in the step D, and then carrying out cyclone classification II to obtain fine particle overflow II with the fineness of 200 meshes accounting for more than 95% and coarse particle ore pulp II, and returning the coarse particle ore pulp II to the cyclone classification II after the coarse particle ore pulp II is ground by the ore grinding III;
F. two-stage low-intensity magnetic separation: and E, carrying out low intensity magnetic separation II on the fine particle overflow II obtained in the step E to obtain iron concentrate slurry II and tailing slurry II, wherein the magnetic induction intensity of the low intensity magnetic separation II is 80-150 mT, the concentration of the iron concentrate slurry II is not less than 40%, the Fe grade of the iron concentrate slurry II is not less than 50%, and the tailing slurry II is thrown.
2. The efficient beneficiation method for the low-grade refractory metallurgical titanomagnetite according to claim 1, characterized in that the undersize tailing slurry obtained in the step D is subjected to strong magnetic separation I with the magnetic induction intensity of 1-1.2T to obtain strong magnetic concentrate I and strong magnetic tailings I, the strong magnetic concentrate I is combined into the iron concentrate slurry I, and the strong magnetic tailings I are discarded.
3. The efficient beneficiation method for the low-grade refractory metallurgical titanomagnetite according to claim 1, characterized in that the tailing slurry II obtained in the step F is fed into concentration equipment to be concentrated to obtain concentrated tailing slurry with the concentration not more than 5%, the concentrated tailing slurry is subjected to 1-2 levels of strong magnetic separation to obtain strong magnetic concentrate and strong magnetic tailings, the strong magnetic concentrate is combined into the iron concentrate slurry II, and the strong magnetic tailings are thrown.
4. The efficient beneficiation method for the low-grade refractory metallurgical titanomagnetite according to claim 3, characterized in that the concentrated tailing slurry is subjected to strong magnetic separation II with the magnetic induction intensity of 1-1.2T to obtain strong magnetic concentrate II and strong magnetic tailing II, and the strong magnetic concentrate II is combined into iron concentrate slurry II.
5. The efficient beneficiation method for the low-grade refractory metallurgical titanomagnetite according to claim 4, characterized in that the strong magnetic concentrate II is subjected to strong magnetic separation III with the magnetic induction intensity of 1.2-1.5T to obtain a strong magnetic concentrate III and a strong magnetic tailing III, the strong magnetic concentrate III is combined into iron concentrate pulp II, and the strong magnetic tailing III is combined into strong magnetic tailing II for tailing discarding.
6. The efficient beneficiation method for the low-grade refractory titanomagnetite according to claim 1, characterized in that the fineness I of the fine particle overflow obtained in the step B is-200 meshes, the fineness I accounts for more than 75%, and the concentration I is 15-20%.
7. The efficient beneficiation method for the low-grade refractory titanomagnetite according to claim 1, characterized in that the iron concentrate slurry II is fed into an elutriation magnetic separator to obtain elutriation concentrate and elutriation tailings with the concentration not less than 60%.
8. The efficient ore dressing method for the low-grade refractory titanomagnetite according to claim 7, characterized in that the water supply pressure of the elutriation magnetic separator is not less than 0.25MPa, the working voltage is 380v, and the magnetic field intensity is 0-300 Gs adjustable.
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