CN113385299B - Magnetic-gravity-magnetic combined ore dressing process for treating lean magnetite ore - Google Patents
Magnetic-gravity-magnetic combined ore dressing process for treating lean magnetite ore Download PDFInfo
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- CN113385299B CN113385299B CN202110588144.3A CN202110588144A CN113385299B CN 113385299 B CN113385299 B CN 113385299B CN 202110588144 A CN202110588144 A CN 202110588144A CN 113385299 B CN113385299 B CN 113385299B
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Abstract
The invention relates to a magnetic-gravity-magnetic combined mineral processing technology for treating lean magnetite, which comprises the following steps: feeding 24% -30% magnetite ore to obtain a section of weak magnetic concentrate through a section of closed circuit grinding and a section of weak magnetism in sequence, wherein the section of weak magnetic concentrate is subjected to subsequent heavy magnetic sieve combination operation, secondary grinding classification operation and three sections of magnetic separation operation in sequence to obtain final concentrate and final tailings; the gravity and magnetic sieve combination industry consists of a spiral chute, a fine sieve and a two-section weak magnetic machine, wherein the gravity separation process consisting of the spiral chute is a gravity separation process of coarse-fine-scanning, the two-section weak magnetic machine is used for treating the swept snail tailings, and the fine sieve is used for treating the fine snail concentrate to obtain gravity concentrate; and (3) processing the middlings in the gravity and magnetic sieve combination industry through secondary ore grinding classification operation and three-stage magnetic separation operation to obtain magnetic concentrate. The advantages are that: the process is simplified, the coarse grains are refined, the excessive grinding is reduced, the energy is saved, the consumption is reduced, and the capacity of the ball mill is released.
Description
Technical Field
The invention belongs to the technical field of mineral processing in mineral engineering, and particularly relates to a magnetic-gravity-magnetic combined mineral processing technology for treating lean magnetite.
Background
At present, in domestic magnetite ore dressing plants, a stage grinding-stage separation-single magnetic separation-fine screening regrinding process is mostly adopted when magnetite ores with uneven embedded particle sizes are treated. Although stage grinding-stage magnetic separation is adopted, for one-stage magnetic separation operation, only one-stage magnetic separation tailings realize coarse grain tailing discarding, and for coarse grain iron minerals which are already subjected to monomer dissociation in one-stage magnetic separation concentrate, concentration operation is not carried out to realize coarse grain refining, so that a final coarse grain concentrate product is obtained, and the final coarse grain concentrate product is fed into the second-stage grinding to continue grinding in a unified manner regardless of whether the iron minerals in the first-stage magnetic separation concentrate are subjected to monomer dissociation or not; this treatment is technically or economically unreasonable.
For example, the lean magnetite ore with non-uniform intercalated particle size, which is processed by a long-arch ore dressing plant, has an intercalated particle size distribution of iron minerals and gangue minerals as shown in table 1.
Table 1 results of ore particle size distribution
As can be seen from Table 1, the iron mineral and gangue mineral of the lean magnetite have extremely uneven distribution of the intercalated particle size, the positive cumulative yield of the iron mineral with the intercalated particle size of more than 104 μm is more than 50%, the positive cumulative yield of more than 74 μm reaches 70.90%, and the content of the iron mineral with the particle size of less than 15 μm is only 3.9%; the corresponding embedded granularity is 147 mu m when the positive cumulative yield content of the gangue minerals reaches 50 percent, the positive cumulative yield of the grain fraction more than 74 mu m reaches 77.43 percent, and the grain fraction content of the gangue minerals less than 15 mu m is only 1.83 percent. The average embedded particle size of the iron mineral is 60.65 mu m, the average embedded particle size of the gangue mineral is 89.07 mu m, and the embedded particle size of the gangue mineral is obviously coarser than that of the iron mineral, so that the coarse grain tailing discarding is facilitated.
The magnetite beneficiation process of the current bow-long-ridge concentrating mill adopts a single magnetic separation process of three-stage ore grinding, seven-stage magnetic separation and two-stage screening, and the production process flow is shown in figure 2. Although the concentrate grade of the arch-long ridge concentrating mill reaches over 67 percent through the separation of the concentrating process, the concentrate grade is obtained under the condition that the fineness of the concentrate product is controlled to be-200 meshes (namely-74 mu m) and the content of the concentrate product reaches over 95 percent. As is apparent from table 1, 70.90% or more of the iron minerals recovered from the concentrate in the beneficiation process are excessively ground after monomer dissociation is achieved, i.e., the iron minerals are severely over-crushed in the beneficiation process. Therefore, the ore dressing process for treating magnetite ore with nonuniform disseminated particle size has the following problems: 1) Iron minerals which are subjected to monomer dissociation in the first-stage magnetic separation concentrate enter second-stage grinding, so that the second-stage grinding treatment capacity is influenced, and the grinding cost is increased; 2) the iron minerals dissociated by the monomers are ground again to generate over-crushing, thereby wastefully causing energy waste, deteriorating subsequent sorting indexes, causing technical problems of aggravation of metal loss, reduction of recovery rate and the like; 3) in a word, a large amount of iron minerals dissociated by monomers are excessively ground, and finally, the process flow is long and tedious, the efficiency is low, the water consumption is large, and the mineral separation cost is increased.
The core of magnetite beneficiation process flow optimization is reducing overgrinding, fine tailing discarding is achieved under the condition of coarse granularity as far as possible, namely concentrate can be taken early, tailings can be thrown early, useful minerals dissociated by monomers are sorted into qualified products in time, gangue minerals dissociated by monomers are discarded at the tail in time, the coarsest sorting granularity and shortest beneficiation flow under full monomer dissociation are pursued, and therefore sorting efficiency is improved, processing capacity is improved, energy is saved, consumption is reduced, and operation cost is reduced.
The process of grinding and sorting the final concentrate by coarse and fine separation and coarse grain taking based on the uneven distribution granularity of the iron minerals in the magnetite has not been reported.
Disclosure of Invention
Based on the characteristic of nonuniform embedded particle size of iron minerals in magnetite, the invention aims to provide a magnetic-gravity-magnetic combined beneficiation process for treating lean magnetite, which reduces the excessive crushing of the iron minerals, realizes coarse grain refining, saves energy, reduces consumption and simplifies the process flow.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a magnetic-gravity-magnetic combined mineral processing technology for treating lean magnetite, which comprises the following steps: feeding magnetite ore raw ore with the granularity of-12 mm and the content of 90% and the grade of 24% -30% into a primary closed-circuit ore grinding operation to obtain a primary grading overflow product with the content of-200 meshes of 50% -60%, feeding the primary grading overflow product into a section of weak magnetic operation to obtain a section of weak magnetic concentrate and a section of weak magnetic tailing, and throwing the tail of the section of weak magnetic tailing, wherein the section of weak magnetic concentrate is sequentially subjected to subsequent heavy magnetic sieve combination operation, secondary ore grinding grading operation and three sections of magnetic separation operation to obtain final concentrate and final tailing;
the gravity and magnetic sieve combination industry consists of a spiral chute, a fine sieve and a two-section weak magnetic machine, wherein the gravity flow consisting of the spiral chute is a gravity flow of coarse-fine scanning;
feeding the first-stage weak magnetic concentrate into a roughing spiral chute for sorting to obtain a coarse snail concentrate and coarse snail tailings; feeding the crude snail tailings into a scavenging spiral chute for sorting to obtain a scavenging snail concentrate and scavenging snail tailings; feeding the snail-swept tailings into a second-stage weak magnetic machine to obtain second-stage weak magnetic concentrate and second-stage weak magnetic tailings, and discarding the tails of the second-stage weak magnetic tailings; feeding the coarse snail concentrate into a fine spiral chute to obtain fine snail middling, fine snail concentrate and fine snail tailings; the concentrate of the spiral shell is self-circulated, the concentrate of the spiral shell is fed into a fine sieve to obtain products above the sieve and products below the sieve, and the products below the sieve are gravity concentrate; combining the oversize product, the fine spiral tailings, the sweep spiral concentrate and the second-stage weak magnetic concentrate into middlings in the gravity-magnetic sieve combination industry, and feeding the middlings into secondary ore grinding and grading operation;
the secondary ore grinding classification operation consists of a secondary cyclone, a secondary ball mill and a coarse and fine classification cyclone;
feeding the middling into a secondary cyclone in the heavy magnetic sieve combination industry, feeding the secondary cyclone with graded settled sand into a secondary ball mill, combining graded overflow products of the secondary cyclone and ore discharge of the secondary ball mill, and feeding the products into a coarse and fine grading cyclone to obtain coarse and fine grit settled sand products of the coarse and fine grading cyclone and fine grit overflow products of the coarse and fine grading cyclone, returning the coarse and fine grit settled sand products of the coarse and fine grading cyclone to a roughing spiral chute to form a closed circuit, and feeding the fine grit overflow products of the coarse and fine grading cyclone into three-stage magnetic separation operation;
the three-stage magnetic separation operation consists of a concentration magnetic separator and an elutriation magnetic separator;
feeding the overflow product of the coarse and fine grading cyclone into a concentration magnetic separator, feeding concentrate of the concentration magnetic separator into an elutriation magnetic separator, wherein the concentrate of the elutriation magnetic separator is magnetic concentrate, and discarding tailings of the concentration magnetic separator and tailings of the elutriation magnetic separator;
the gravity concentrate and the magnetic concentrate are combined into final concentrate, the grade of the final concentrate is 66-67%, the recovery rate is 75-78%, and the yield is 28-32%; the first-stage weak magnetic tailings, the second-stage weak magnetic tailings, the concentrated magnetic separator tailings and the elutriation magnetic separator tailings are combined into final tailings, and the final tailings are 9.0-9.3% in grade.
Preferably, the gravity concentrate grade is 66.5% -67.5%, and the magnetic concentrate grade is 65.0% -66.0%.
Preferably, the grade of the first-stage weak magnetic tailings is 8.5% -9.5%, and the grade of the second-stage weak magnetic tailings is 7.5% -8.5%.
Preferably, the tailings grade of the concentration magnetic separator is 7.5-8.5%, and the tailings grade of the elutriation magnetic separator is 9.5-10.5%.
Preferably, the grain size of the overflow product of the coarse and fine classification cyclone is-200 meshes, and the content of the grain size accounts for 90-95%.
Compared with the prior art, the invention has the advantages that:
1) the invention separates coarse magnetite by adopting a spiral chute and a fine sieve under the same granularity condition to obtain qualified gravity concentrate, thereby realizing coarse granularity concentration.
2) The ore grinding operation of the invention is reduced from three sections to two sections, and because the qualified gravity concentrate is taken in advance, the load of the two-section grinding machine is greatly reduced, and meanwhile, the over-crushing of the monomer dissociated iron ore is reduced, the problem that the existing low intensity magnetic separation equipment is difficult to well separate the iron ore with wider particle size range from the poor intergrowth is solved, and the subsequent magnetic separation operation is facilitated.
3) After the process flow is adopted, compared with the conventional process, three sections of ore grinding are cancelled, one-to-one mode of first-section ore grinding and second-section ore grinding is cancelled, one-to-one mode of the three first-section mills and the two-section ore grinding can be realized, the three first-section mills correspond to one second-section mill, the process is simplified, the equipment investment is reduced, the energy-saving and consumption-reducing effects are remarkable, and the ore grinding cost and the production cost are reduced.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a flow chart of the original stage ore grinding-stage separation-single magnetic separation-fine sieve regrinding process.
Detailed Description
The invention is further illustrated by the following figures and examples.
Examples
As shown in fig. 1, a magnetic-gravity-magnetic combined beneficiation process for treating lean magnetite ore of the present invention includes: the method comprises the following steps of feeding 90% magnetite ore with the granularity of-12 mm and the content of 25.45% into a first-stage closed-circuit ore grinding operation to obtain a first-stage classification overflow product with the content of-200 meshes of 57.35%, feeding the first-stage classification overflow product into a first-stage weak magnetic operation to obtain a first-stage weak magnetic concentrate and a first-stage weak magnetic tailing, and discarding the tail of the first-stage weak magnetic tailing, and is characterized in that: the first-stage weak magnetic concentrate is sequentially subjected to subsequent heavy magnetic sieve combination operation, secondary grinding classification operation and three-stage magnetic separation operation to obtain final concentrate and final tailings;
the gravity and magnetic sieve combination industry consists of a spiral chute, a fine sieve and a two-section weak magnetic machine, wherein the gravity separation process consisting of the spiral chute is a gravity separation process with one coarse step and one fine step;
feeding the first-stage weak magnetic concentrate into a roughing spiral chute for sorting to obtain a coarse snail concentrate and coarse snail tailings; feeding the crude snail tailings into a scavenging spiral chute for sorting to obtain a scavenging snail concentrate and scavenging snail tailings; feeding the snail-swept tailings into a second-stage weak magnetic machine to obtain second-stage weak magnetic concentrate and second-stage weak magnetic tailings, and discarding the tails of the second-stage weak magnetic tailings; feeding the coarse snail concentrate into a fine spiral chute to obtain fine snail middling, fine snail concentrate and fine snail tailings; the concentrate of the spiral shell is self-circulated, the concentrate of the spiral shell is fed into a fine sieve to obtain products above the sieve and products below the sieve, and the products below the sieve are gravity concentrate; combining the oversize product, the fine spiral tailings, the sweep spiral concentrate and the second-stage weak magnetic concentrate into middlings in the gravity-magnetic sieve combination industry, and feeding the middlings into secondary ore grinding and grading operation;
the secondary ore grinding classification operation consists of a secondary cyclone, a secondary ball mill and a coarse and fine classification cyclone;
the heavy magnetic sieve combination industry feeds ores into a secondary cyclone, secondary cyclone graded settled sand is fed into a secondary ball mill, secondary cyclone graded overflow products and secondary ball mill ore discharge are combined and fed into a coarse and fine grading cyclone, coarse grain settled sand products of the coarse and fine grading cyclone with-200 meshes of 44.25% and fine grain overflow products of the coarse and fine grading cyclone with-200 meshes of 92.25% are obtained, the coarse grain settled sand products of the coarse and fine grading cyclone return to a roughing spiral chute to form a closed circuit, and the fine grain overflow products of the coarse and fine grading cyclone are fed into three-stage magnetic separation operation;
the three-stage magnetic separation operation consists of a concentration magnetic separator and an elutriation magnetic separator;
feeding the overflow product of the coarse and fine grading cyclone into a concentration magnetic separator, feeding concentrate of the concentration magnetic separator into an elutriation magnetic separator, wherein the concentrate of the elutriation magnetic separator is magnetic concentrate, and discarding tailings of the concentration magnetic separator and tailings of the elutriation magnetic separator;
the gravity concentrate and the magnetic concentrate are combined into final concentrate, the grade of the final concentrate is 66.5%, the recovery rate is 75%, and the yield is 28.66%; the first-stage weak magnetic tailings, the second-stage weak magnetic tailings, the concentrated magnetic separator tailings and the elutriation magnetic separator tailings are combined into final tailings, and the final tailings are 8.93% in grade.
The quality of the gravity concentrate is 66.83%, and the quality of the magnetic concentrate is 66.1%.
The grade of the first-stage weak magnetic tailings is 9.47%, and the grade of the second-stage weak magnetic tailings is 7.58%.
The tailings grade of the concentration magnetic separator is 8.3%, and the tailings grade of the elutriation magnetic separator is 10.33%.
Claims (5)
1. A magnetic-heavy-magnetic combined ore dressing process for treating lean magnetite ore comprises the following steps: feeding raw magnetite ore with the granularity of-12 mm and the content of 90 percent and the grade of 24-30 percent into a closed circuit grinding operation to obtain a primary grading overflow product with the granularity of-200 meshes and the content of 50-60 percent, feeding the primary grading overflow product into a section of weak magnetic operation to obtain a section of weak magnetic concentrate and a section of weak magnetic tailings, and throwing the tail of the section of weak magnetic tailings, and is characterized in that the section of weak magnetic concentrate is sequentially subjected to subsequent heavy magnetic sieve combination operation, secondary grinding grading operation and three sections of magnetic separation operation to obtain final concentrate and final tailings;
the gravity and magnetic sieve combination industry consists of a spiral chute, a fine sieve and a two-section weak magnetic machine, wherein the gravity flow consisting of the spiral chute is a gravity flow of coarse-fine scanning;
feeding the first-stage weak magnetic concentrate into a roughing spiral chute for sorting to obtain a coarse snail concentrate and coarse snail tailings; feeding the crude snail tailings into a scavenging spiral chute for sorting to obtain a scavenging snail concentrate and scavenging snail tailings; feeding the snail-swept tailings into a second-stage weak magnetic machine to obtain second-stage weak magnetic concentrate and second-stage weak magnetic tailings, and discarding the tails of the second-stage weak magnetic tailings; feeding the coarse snail concentrate into a fine spiral chute to obtain fine snail middling, fine snail concentrate and fine snail tailings; the concentrate of the spiral shell is self-circulated, the concentrate of the spiral shell is fed into a fine sieve to obtain products above the sieve and products below the sieve, and the products below the sieve are gravity concentrate; combining the oversize product, the fine spiral tailings, the sweep spiral concentrate and the second-stage weak magnetic concentrate into middlings in the gravity-magnetic sieve combination industry, and feeding the middlings into secondary ore grinding and grading operation;
the secondary ore grinding classification operation consists of a secondary cyclone, a secondary ball mill and a coarse and fine classification cyclone;
feeding the middling into a secondary cyclone in the heavy magnetic sieve combination industry, feeding the secondary cyclone with graded settled sand into a secondary ball mill, combining graded overflow products of the secondary cyclone and ore discharge of the secondary ball mill, and feeding the products into a coarse and fine grading cyclone to obtain coarse and fine grit settled sand products of the coarse and fine grading cyclone and fine grit overflow products of the coarse and fine grading cyclone, returning the coarse and fine grit settled sand products of the coarse and fine grading cyclone to a roughing spiral chute to form a closed circuit, and feeding the fine grit overflow products of the coarse and fine grading cyclone into three-stage magnetic separation operation;
the three-stage magnetic separation operation consists of a concentration magnetic separator and an elutriation magnetic separator;
feeding the overflow product of the coarse and fine grading cyclone into a concentration magnetic separator, feeding concentrate of the concentration magnetic separator into an elutriation magnetic separator, wherein the concentrate of the elutriation magnetic separator is magnetic concentrate, and discarding tailings of the concentration magnetic separator and tailings of the elutriation magnetic separator;
the gravity concentrate and the magnetic concentrate are combined into final concentrate, the grade of the final concentrate is 66-67%, the recovery rate is 75-78%, and the yield is 28-32%; the first-stage weak magnetic tailings, the second-stage weak magnetic tailings, the concentrated magnetic separator tailings and the elutriation magnetic separator tailings are combined into final tailings, and the final tailings are 8.5% -9.0% in grade.
2. The magnetic-gravity-magnetic combined beneficiation process for treating the lean magnetite ore according to claim 1, wherein the gravity concentrate grade is 66.5% -67.5%, and the magnetic concentrate grade is 65.0% -66.0%.
3. The magnetic-gravity-magnetic combined beneficiation process for treating the lean magnetite ore according to claim 1, wherein the grade of the first-stage weak magnetic tailings is 8.5% -9.5%, and the grade of the second-stage weak magnetic tailings is 7.5% -8.5%.
4. The magnetic-gravity-magnetic combined mineral processing process for treating the lean magnetite ore according to claim 1, wherein the tailings grade of the concentration magnetic separator is 7.5-8.5%, and the tailings grade of the elutriation magnetic separator is 9.5-10.5%.
5. A magnetic-gravity-magnetic combined mineral processing technology for processing lean magnetite according to claim 1, characterized in that the fine overflow product of the coarse and fine classification cyclone has a-200 mesh content of 90-95%.
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| CN113941425A (en) * | 2021-09-16 | 2022-01-18 | 魏昌国 | Iron ore grinding and separating process |
| CN114887758B (en) * | 2022-04-26 | 2023-10-20 | 鞍钢集团矿业有限公司 | Stage grinding and selecting process for magnetite ore with sand setting and tailing discarding functions |
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