CN111001486A - Method for optimizing grinding fineness of silver-tin multi-metal paragenetic ore based on raw ore grade ratio - Google Patents
Method for optimizing grinding fineness of silver-tin multi-metal paragenetic ore based on raw ore grade ratio Download PDFInfo
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- CN111001486A CN111001486A CN201911205703.7A CN201911205703A CN111001486A CN 111001486 A CN111001486 A CN 111001486A CN 201911205703 A CN201911205703 A CN 201911205703A CN 111001486 A CN111001486 A CN 111001486A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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Abstract
The invention discloses a method for optimizing the grinding fineness of silver-tin multi-metal intergrown ore based on the grade ratio of raw ore. The method comprises the following steps: s1, dividing the silver-tin multi-metal paragenetic ore into a high-silver low-tin class, a medium-grade product class and a low-silver high-tin class according to different grades of raw ores; s2, grinding the three types of raw ores in the step S1 respectively, grading the ground ore products, enabling the ground ore products with the grain sizes meeting the grading requirements to enter a grading operation, and returning the ground ore products with the grain sizes larger than the grading requirements to the ball mill for re-grinding to obtain final ground ore products. The invention provides a self-adaptive system for synchronously regulating and controlling grinding and selecting parameters according to the raw ore silver-tin ratio by taking the raw ore grade ratio of silver and tin as a basis, avoids two-electrode differentiation of the granularity of grinding products, properly adjusts the grinding ball-matching ratio and the sand return ratio, realizes that the grinding products with proper grinding fineness are obtained according to different ore grades, and is suitable for recovering the variable silver-tin polymetallic paragenetic ore with the ore feeding property.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a method for optimizing the grinding fineness of a silver-tin multi-metal paragenetic ore based on a raw ore grade ratio.
Background
Silver-tin polymetallic paragenic ore is an important mineral resource for recovering metallic silver and tin, wherein silver is often associated with sulfide ore, so that the recovery of silver is accompanied with synchronous enrichment of products such as copper, zinc, sulfur and the like by a flotation method. For the cassiterite, the specific gravity (6.8-7.1) of the cassiterite is far greater than that of gangue minerals and is higher than common associated sulfide minerals such as pyrite (4.9-5.2), chalcopyrite (4.1-4.3), zinc blende (3-4.5) and the like, so the gravity separation is the most main mineral separation means for recovering the cassiterite. For multi-metal sulfide ores, fine grinding is needed to ensure monomer dissociation and efficient flotation recovery among minerals; for the cassiterite, the cassiterite is fragile and easy to over-grind, and the efficient gravity concentration of the cassiterite can be realized only by coarse grinding as much as possible. Therefore, how to balance the contradiction between the flotation and gravity process feeding granularity, optimize the granularity composition of the product and give consideration to the flotation and gravity separation indexes is the key to realizing the economic maximization of the plant selection.
Because the product value of tin is high, and the requirement on granularity of gravity separation is strict, fine-grained cassiterite is easy to be washed into tailings in gravity separation equipment such as a shaking table, the recovery rate of the cassiterite is low, and the benefits of enterprises are seriously damaged. Therefore, to avoid over-grinding of cassiterite, the mill often uses single-stage grinding or ore grinding to avoid over-grinding of cassiterite. However, the coarse grinding tends to cause the polymetallic sulfide ore to be difficult to be dissociated by the monomer, so that the recovery rate of the sulfide ore is reduced. In addition, because of the fluctuation of ore properties in a dressing plant, the grades of main valuable elements in ore feeding are high and low, the single ore grinding fineness is difficult to adapt to the change of ore feeding properties, and particularly, when the ore with high silver and low tin is treated, a large amount of precious metal silver is lost. Except single grinding, part of the mines adopt stage grinding and stage separation to comprehensively recover the resources, a plurality of sulfide ores are mixed and separated through a sulfide ore mixed flotation process or a part of mixed flotation process after coarse grinding, then grinding and re-separating are carried out, and cassiterite reselection is carried out on flotation tailings. However, in spite of the higher dosage of the chemical agent, the mixed flotation still has a more serious tailing phenomenon of the coarse aggregate, which not only causes the loss of valuable elements, but also seriously interferes with the separation of the cassiterite after the part of mineral aggregate with large specific gravity enters the gravity separation equipment, so that the cassiterite is difficult to intercept on the bed surface of the shaking table.
CN109499748A discloses a method for separating cassiterite and gangue in a grinding circuit, which comprises screening products with different size fractions in the grinding circuit, then feeding the screened products into a hydraulic separator for separation to obtain coarse concentrate and tailings, separating the coarse concentrate from gangue minerals, then combining the coarse concentrates and finely grinding, and obtaining the cassiterite product after magnetic separation and flotation desulfurization. However, the process is only suitable for paragenic ores in which cassiterite and sulfide minerals exist in the form of coarse-grained aggregates, and for ores with embedded granularity of sulfide minerals or ores with complex embedded relation, coarse concentrate products cannot be directly obtained by pure screening, and high-grade tin concentrates cannot be obtained only by magnetic separation and flotation desulfurization.
CN102218374A discloses a method for selectively grinding cassiterite and polymetallic sulphide ore, which utilizes the difference of hydrophilic/hydrophobic properties between the cassiterite surface and sulphide ore, and adds a flotation reagent in the grinding process, so that the flotation reagent is fully combined with the sulphide ore surface, and simultaneously the effect between cassiterite and a collecting agent ethionine is avoided, thereby realizing the flotation separation of cassiterite and sulphide ore under the coarse grinding condition. The process strengthens the floatability difference between the cassiterite and the sulfide minerals, however, because the cassiterite is oxide minerals and has weaker adsorption effect on sulfide mineral collectors such as ethionine and the like, the strengthening of the floatability difference between the cassiterite and the sulfide minerals has smaller significance. In addition, the process still adopts a one-stage coarse grinding mode, and the problems of poor adaptability of the ore dressing process and the like caused by ore grade fluctuation are not solved substantially.
CN103008112A discloses a method for selectively grinding and floating cassiterite multi-metal sulfide ore, which comprises selectively grinding cassiterite multi-metal sulfide ore by a rod mill, and adding various agents in the grinding operation to strengthen floatability difference between cassiterite and sulfide ore, thereby realizing flotation separation of cassiterite and sulfide ore. The process adopts the characteristics of linear ore grinding and selectivity of a rod mill, tries to avoid the over-crushing phenomenon of the cassiterite and achieves the aim of selective ore grinding. However, under the same steel bar filling rate and grinding fineness, when the properties of the ore change, particularly when the grade of the sulfide ore is high, the process cannot realize the monomer dissociation of the sulfide ore, so that the tailing of the sulfide ore, particularly the precious metal silver, is easy to cause. Meanwhile, because the hardness of the sulfide ore is relatively high, and the crushing rate of the rod mill is small, the rod mill is suitable for rough grinding operation, so that effective dissociation of the sulfide ore cannot be realized by adopting a single rod mill. The existing process can not well solve the contradiction of ore feeding granularity in flotation and gravity separation flows, is difficult to adapt to the changeful ore feeding property of a selecting factory, and can not well recover the metallic silver and tin in the silver-tin polymetallic paragenetic ore.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the contradiction that silver and other sulfide minerals need to be finely ground and cassiterite needs to be coarsely ground in the existing silver-tin multi-metal paragenetic ore grinding process, and simultaneously overcoming the defect and the defect that the existing ore grinding process is difficult to adapt to the changeability of ore feeding property of a selection plant, and providing a method for optimizing the fineness of grinding of silver-tin multi-metal paragenetic ore based on the grade ratio of raw ore.
The above purpose of the invention is realized by the following technical scheme:
a method for optimizing the fineness of silver-tin multi-metal intergrown ore based on the grade ratio of raw ore comprises the following steps:
s1, dividing the silver-tin multi-metal paragenetic ore into a high-silver low-tin class, a medium-grade product class and a low-silver high-tin class according to different grades of raw ores;
s2, grinding the raw ore in the step S1, classifying ground ore products through a high-frequency fine sieve or a hydrocyclone, enabling undersize products or hydrocyclone overflow to enter sorting operation, and returning oversize products or hydrocyclone settled sand to the grinder for regrinding; meanwhile, according to the different grade ratios of silver and tin, the ball matching ratio and the sand return ratio of the mill are adjusted to obtain a grinding product with a certain fineness.
Wherein the high-silver low-tin is silver-tin multi-metal paragenetic ore with silver-tin grade ratio of Ag/Sn > 175;
the medium products are silver-tin multi-metal paragenic ores with the silver-tin grade ratio of 125< Ag/Sn < 175;
the low-silver high-tin is silver-tin multi-metal paragenetic ore with the silver-tin grade ratio of Ag/Sn < 125.
The invention aims at the characteristics that the single ore grinding granularity composition of the silver-tin multi-metal paragenetic ore is bipolar differentiation, and staged ore grinding is difficult to adapt to ore property variation. Based on the characteristics of different embedded granularity of cassiterite and sulfide mineral, spatial evolution difference of cassiterite and sulfide mineral forming tools and linear dependency of silver and sulfide mineral, the raw ore grade ratio of two main valuable elements, namely silver and tin, is selected as a basis, and an adaptive system for synchronously regulating and controlling grinding parameters according to the raw ore silver-tin ratio of grinding fineness is provided: the method is characterized in that the grade ratio of raw ore Ag/Sn is calculated, the endowment characteristics of the ore are found out, the ore is divided into three types of high-silver low-tin, medium-silver high-tin, and then grinding is carried out on the three types of ore by respectively adopting different grinding fineness through controlling grinding ball matching ratio and sand return ratio, so that the bipolar differentiation of the granularity of grinding products is avoided, the content of-0.1 +0.02mm which is beneficial to both sulfide ore and cassiterite is increased, and the requirements of full dissociation of sulfide ore and efficient gravity concentration of cassiterite can be met simultaneously.
Preferably, the specific operation of classifying the ground ore in S2 is as follows: the ground ore passes through a high-frequency fine sieve, and the sieve pore size of the high-frequency fine sieve is 0.4 mm.
Preferably, the specific operation of classifying the ground ore in S2 is as follows: the ground ore is classified by a hydrocyclone, and the diameter of the hydrocyclone is 250 mm.
Preferably, the secondary grinding treatment in S2 is ball mill grinding, the grinding media of the ball mill are steel balls with the ball diameter sizes of 60mm, 80mm and 120mm,
when high-silver low-tin materials are treated, the number ratio of steel balls with the ball diameters of 120mm, 80mm and 60mm is 3:3: 4;
when medium products are processed, the number ratio of steel balls with the ball diameters of 120mm, 80mm and 60mm is 3:4: 3;
when low-silver high-tin class is processed, the number ratio of steel balls with the ball diameters of 120mm, 80mm and 60mm is 4:3: 3.
Wherein, it is required to be noted that:
aiming at the difference of the grade ratio of silver and tin of the raw ore, the selective ore grinding of the ore can be realized by adjusting the ball proportioning ratio of steel balls with different sizes: when high-silver low-tin materials are treated, small steel balls (60mm) with a high proportion are adopted, so that the grinding effect of the steel balls on minerals in the ore grinding process can be increased, the ore grinding fineness is further reduced, monomer dissociation among sulfide ore aggregates is ensured, and the preferential enrichment of sulfide ores and associated silver minerals is further ensured; when low-silver high-tin ores are processed, large steel balls (120mm) with a high proportion are adopted, so that the grinding effect of the steel balls in the ore grinding process can be avoided, and the over-crushing phenomenon is reduced, so that the content of extremely fine particle grades unfavorable for heavy dressing is reduced, the granularity of ore grinding products of the ores is coarse, and the sorting and enrichment of cassiterite are preferentially ensured; when dealing with medium-sized products, a higher proportion of medium-sized steel balls (80mm) is used, thus ensuring simultaneous enrichment of silver and tin.
Preferably, in the ore grinding process in S2,
when high-silver low-tin materials are treated, the ore grinding sand return ratio is 250-300;
when medium-grade products are treated, the ore grinding sand return ratio is 350-400;
when treating low-silver high-tin materials, the ore grinding sand return ratio is 450-500.
Wherein, it is required to be noted that:
aiming at the difference of the silver-tin grade ratio of the raw ore, the selective ore grinding of the ore is further realized by adjusting the ore grinding sand return ratio: when high-silver low-tin minerals are treated, a smaller sand return ratio (250-300) is adopted, and the ore grinding time of the minerals in a grinding machine is increased, so that the ore grinding fineness of raw ores is increased, and the monomer dissociation degree of a sulfide ore aggregate is improved, thereby being beneficial to preferential enrichment of sulfide ores and associated silver minerals; when low-silver high-tin materials are treated, a larger sand return ratio (450-500) is adopted, the ore grinding time of minerals in a grinding machine is shortened, the grinding machine carries out forced ore discharge, the ore grinding fineness is further reduced, the over-crushing phenomenon of the ores is avoided, and therefore the high-efficiency enrichment of cassiterite is preferentially guaranteed; when medium-grade products are treated, a medium sand return ratio (350-400) is adopted, so that medium grain size fractions of ore grinding products are more, and synchronous enrichment of silver and cassiterite is promoted.
By properly adjusting the grinding ball-matching ratio and the sand return ratio, the high-grade valuable metal is preferentially recovered according to different ore grades. The problems that sulfide ore is difficult to effectively recover and fine grinding cassiterite cannot be reselected and enriched due to the original coarse grinding are eliminated, and the ore grinding system with the most valuable elements recovered preferentially is realized.
Preferably, the fineness of the grinding ore is as follows:
when high-silver low-tin ores are processed, the final grinding fineness is 55-65% of-0.074 mm;
when medium-product ores are processed, the final grinding fineness is 50-55% of-0.074 mm;
when low-silver high-tin ores are processed, the final grinding fineness of-0.074 mm accounts for 45-50%.
Preferably, during the ore grinding process,
the grinding fineness of the final grinding product of high-silver and low-tin is-0.074 mm and accounts for 59.55-62.69%;
the grinding fineness of the final ground ore product of the medium product class is 52.57 to 53.08 percent when the fineness is-0.074 mm;
the grinding fineness of the final grinding product of the low-silver high-tin class is-0.074 mm and accounts for 45.53-47.68%.
Further preferably, during the ore grinding process,
the grinding fineness of the final grinding product of high-silver low-tin class is-0.074 mm and accounts for 59.55 percent;
the grinding fineness of the final ground ore product of the medium product class is 53.08 percent with-0.074 mm;
the grinding fineness of the final ground ore product of the low-silver high-tin class is-0.074 mm and accounts for 47.68 percent.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for optimizing the fineness of silver-tin multi-metal intergrown ore based on the grade ratio of raw ore, by selecting the raw ore grade ratio of two main valuable elements of silver and tin as a basis, a self-adaptive system for synchronously regulating and controlling grinding and selecting parameters according to the raw ore silver-tin ratio of the grinding fineness is provided, compared with the original single grinding fineness, the proportion of the medium grade of-0.1 to 0.02mm is improved by properly adjusting the grinding ball-matching ratio and the sand return ratio, the proportion reaches about 60 percent, the proportion of the coarse grade of +0.1mm and the proportion of the fine grade of-0.02 mm are reduced, therefore, the content of-0.1 +0.02mm which is beneficial to the selected size fraction of sulfide ore and cassiterite is increased, the two-electrode differentiation of the granularity of ore grinding products is avoided, the aim of preferentially recovering high-grade valuable metals according to the difference of ore grades is fulfilled, and the method is suitable for recovering variable silver-tin multi-metal paragenic ores with ore feeding properties.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.
Example 1
In this example, a high-silver low-tin ore (average Ag/Sn grade ratio of 185.77) in the simmondsia wuzumulus Qin silver-free mining industry was used as a research object.
A method for optimizing the fineness of silver-tin multi-metal intergrown ore based on the grade ratio of raw ore comprises the following steps:
s1, dividing the silver-tin multi-metal paragenetic ore into high-silver low-tin types, wherein the average Ag/Sn grade ratio of the raw ore is 185.77;
s2, grinding the high-silver low-tin ore, wherein a grinding medium is steel balls with the ball diameters of 120mm, 80mm and 60mm, the ball matching ratio is 3:3:4, the ground product is screened by a 0.4mm high-frequency fine screen, the undersize product is a selected product, the oversize product returns to a ball mill, the washing water amount of the high-frequency fine screen is controlled to enable the grinding sand return ratio to be 250-300, and the grinding fineness of-0.074 mm is finally obtained and accounts for 59.55%.
The result of particle size analysis shows that the occupancy rate of the medium size fraction (-0.1+0.02mm) in the ore grinding product reaches 62.37% aiming at the high-silver low-tin ore, and compared with the original single ore grinding fineness, the occupancy rate of the medium size fraction is increased by 23.97%. In addition, the occupation ratio of the coarse fraction of +0.1mm is 15.29 percent, and the fineness is reduced by 15.18 percent compared with the original single grinding fineness; and the occupancy rate of the-0.02 mm ultrafine grain grade is 22.34 percent, which is reduced by 8.79 percent compared with the original single grinding fineness.
Example 2
In this example, a medium grade ore (average Ag/Sn grade ratio of 150.56) in the uguese wuzumulu Qin silver-mineral industry was studied.
A method for optimizing the fineness of silver-tin multi-metal intergrown ore based on the grade ratio of raw ore comprises the following steps:
s1, dividing the silver-tin multi-metal paragenetic ore into medium-grade products, wherein the average Ag/Sn grade ratio of the raw ore is 150.56;
s2, grinding the medium-grade ore, wherein a grinding medium adopts three ball-diameter steel balls of 120mm, 80mm and 60mm, the ball-matching ratio is 3:4:3, the ground product is screened by a 0.4mm high-frequency fine screen, the undersize product is a selected product, and the oversize product returns to the ball mill. The washing water quantity of the high-frequency fine screen is controlled to enable the grinding sand return ratio to be 350-400, and the grinding fineness of-0.074 mm accounting for 53.08% is finally obtained.
The result of particle size analysis shows that the occupancy rate of the medium grade (-0.1+0.02mm) in the ground ore product reaches 60.33% aiming at the medium grade ore, and compared with the original single ground ore fineness, the occupancy rate of the medium grade is increased by 21.93%. In addition, the occupation ratio of the coarse fraction of +0.1mm is 18.52 percent, and the fineness is reduced by 11.95 percent compared with the original single grinding fineness; the occupancy rate of-0.02 mm ultrafine grain grade is 21.15%, which is reduced by 9.98% compared with the original single grinding fineness.
Example 3
In this example, a low-silver high-tin ore (average Ag/Sn grade ratio of 103.46) in the simmondsia wuzumulus Qin silver-free mining industry was used as a research object.
A method for optimizing the fineness of silver-tin multi-metal intergrown ore based on the grade ratio of raw ore comprises the following steps:
s1, dividing the silver-tin multi-metal paragenetic ore into low-silver high-tin types, wherein the average Ag/Sn grade ratio of the raw ore is 103.46;
s2, grinding the low-silver high-tin ore, wherein the grinding medium is steel balls with the ball diameters of 120mm, 80mm and 60mm, the ball matching ratio is 4:3:3, the ground product is screened by a 0.4mm high-frequency fine screen, the screened product is the selected product, and the screened product returns to the ball mill. By controlling the washing water quantity of the high-frequency fine screen, the grinding sand return ratio is 450-500, and the grinding fineness of-0.074 mm accounting for 47.68% is finally obtained.
The result of particle size analysis shows that the occupancy rate of the medium grade (-0.1+0.02mm) in the ground ore product reaches 58.09% aiming at the medium grade ore, and compared with the original single ground ore fineness, the occupancy rate of the medium grade is increased by 19.69%. In addition, the occupancy rate of the coarse fraction of +0.1mm is 23.67%, which is reduced by 6.80% compared with the original single grinding fineness; and the occupancy rate of the-0.02 mm ultrafine grain grade is 18.24 percent, and the fineness of the ore is reduced by 12.89 percent compared with the original single ore grinding fineness.
Example 4
In this embodiment, a silver-tin polymetallic paragenetic ore (raw ore is represented by three mining points, and the average Ag/Sn grade ratio is 110.33, 157.37, and 186.89, respectively) in Yunnan is used as a research object.
A method for optimizing the fineness of silver-tin multi-metal intergrown ore based on the grade ratio of raw ore comprises the following steps:
s1, when processing an ore with the average Ag/Sn grade ratio of raw ore of 110.33, dividing the silver-tin multi-metal paragenetic ore into low-silver high-tin types; when processing the ore with the average Ag/Sn grade ratio of 157.37, dividing the silver-tin multi-metal paragenetic ore into medium product types; when an ore with an average Ag/Sn grade ratio of 186.89 in the raw ore is processed, the Ag-Sn-polymetallic paragenic ore is classified as a high-Ag low-Sn group at this time.
S2, grinding the three types of ores respectively, wherein steel balls with the ball diameters of 120mm, 80mm and 60mm are adopted as grinding media, and when the low-silver high-tin type ores are processed, the grinding ball matching ratio is 4:3: 3; when medium-product ores are processed, the grinding ball-matching ratio is 3:4: 3; when high-silver low-tin ores are processed, the grinding ball matching ratio is 3:3: 4; classifying different ore grinding products by a hydrocyclone with the diameter of 250mm, then overflowing the hydrocyclone to be a selected product, and returning the settled sand of the hydrocyclone to the ball mill. By controlling the pressure of the cyclone, when low-silver high-tin ores are processed, the grinding sand return ratio is 450-500, and the grinding fineness of 45.53% is finally obtained, wherein the grinding fineness is-0.074 mm; when medium-product ores are treated, the ore grinding sand return ratio is 350-400, and the finally obtained ore grinding fineness is 52.57% of-0.074 mm; when high-silver low-tin ores are processed, the ore grinding sand return ratio is 250-300; the fineness of the finally obtained ground ore accounts for 62.69 percent and is-0.074 mm.
The results of particle size analysis show that when low-silver high-tin ores, medium-grade ores and high-silver low-tin ores are respectively processed, the occupancy rates of medium fraction (-0.1+0.02mm) in the ground ore can respectively reach 57.67%, 59.26% and 62.11%, and compared with the original single grinding fineness, the occupancy rates of the medium fraction are respectively increased by 24.29%, 25.88% and 28.73%. In addition, the occupation rates of the coarse fraction of +0.1mm are respectively 19.97%, 16.57% and 14.67%, and are respectively reduced by 14.48%, 17.88% and 19.78% compared with the original single grinding fineness; and the occupancy rates of-0.02 mm ultrafine particle grades are respectively 22.36%, 24.17% and 23.22, and are respectively reduced by 9.81%, 8.00% and 8.95% compared with the original single ore grinding fineness.
Comparative example 1
In this embodiment, a silver-tin polymetallic paragenetic ore (raw ore is represented by three mining points, and the average Ag/Sn grade ratio is 110.33, 157.37, and 186.89, respectively) in Yunnan is used as a research object.
A method for optimizing the fineness of silver-tin multi-metal intergrown ore based on the grade ratio of raw ore comprises the following steps:
directly grinding three types of ores, wherein the grinding medium is steel balls with the ball diameter of 120mm and 60mm, the proportion of the steel balls is 6:4, the ground ore products are classified by a hydrocyclone with the diameter of 250mm, the overflow of the hydrocyclone is selected products, the sand setting of the hydrocyclone returns to a ball mill, the grinding sand return ratio is uniformly controlled to be 350-400, and the grinding fineness of-0.074 mm is 54.78%.
The result of particle size analysis shows that the occupancy rate of the medium size fraction (-0.1+0.02mm) in the ground ore product is 33.38%. Further, the occupancy of the coarse fraction of +0.1mm was 34.45%, while the occupancy of the very fine fraction of-0.02 mm was 32.17%. In the prior art, the original single ore grinding process is adopted, the ore grinding product is in a bipolar differentiation state, and the optional fraction occupancy is only 33.38%, so that the comprehensive recovery of the silver-tin polymetallic paragenic ore is not facilitated.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A method for optimizing the grinding fineness of silver-tin multi-metal paragenetic ore based on the raw ore grade ratio is characterized by comprising the following steps:
s1, dividing the silver-tin multi-metal paragenetic ore into a high-silver low-tin class, a medium-grade product class and a low-silver high-tin class according to different grades of raw ores;
s2, grinding the raw ore in the step S1, classifying ground ore products through a high-frequency fine sieve or a hydrocyclone, enabling undersize products or hydrocyclone overflow to enter sorting operation, and returning oversize products or hydrocyclone settled sand to the grinder for regrinding; meanwhile, according to the different grade ratios of silver and tin, the ball matching ratio and the sand return ratio of the mill are adjusted to obtain a grinding product with a certain fineness.
Wherein the high-silver low-tin is silver-tin multi-metal paragenetic ore with silver-tin grade ratio of Ag/Sn > 175;
the medium products are silver-tin multi-metal paragenic ores with the silver-tin grade ratio of 125< Ag/Sn < 175;
the low-silver high-tin is silver-tin multi-metal paragenetic ore with the silver-tin grade ratio of Ag/Sn < 125.
2. The method for optimizing the fineness of the silver-tin multi-metal intergrown ore based on the raw ore grade ratio as claimed in claim 1, wherein the specific operation of classifying the ore grinding product in S2 is as follows: the ground ore passes through a high-frequency fine sieve, and the sieve pore size of the high-frequency fine sieve is 0.4 mm.
3. The method for optimizing the fineness of the silver-tin multi-metal intergrown ore based on the raw ore grade ratio as claimed in claim 1, wherein the specific operation of classifying the ore grinding product in S2 is as follows: the ground ore is classified by a hydrocyclone, and the diameter of the hydrocyclone is 250 mm.
4. The method for optimizing the fineness of grind of Ag-Sn-polymetallic paragenic ore based on the grade ratio of raw ore according to any one of claims 1 to 3, wherein the secondary grinding process in S2 is ball mill grinding, the grinding media of the ball mill are steel balls with three ball diameters of 60mm, 80mm and 120mm,
when high-silver low-tin materials are treated, the number ratio of steel balls with the ball diameters of 120mm, 80mm and 60mm is 3:3: 4;
when medium products are processed, the number ratio of steel balls with the ball diameters of 120mm, 80mm and 60mm is 3:4: 3;
when low-silver high-tin class is processed, the number ratio of steel balls with the ball diameters of 120mm, 80mm and 60mm is 4:3: 3.
5. The method for optimizing the fineness of grind of Ag-Sn-polymetallic paragenic ore based on raw ore grade ratio as claimed in claim 4, wherein, in the ore grinding operation in S2,
when high-silver low-tin materials are treated, the ore grinding sand return ratio is 250-300;
when medium-grade products are treated, the grinding sand return ratio is 350-400;
when the low-silver high-tin material is treated, the ore grinding sand return ratio is 450-500.
6. The method for optimizing the fineness of grinding of Ag-Sn-polymetallic paragenic ore based on raw ore grade ratio as claimed in claim 5, wherein in the ore grinding process,
the grinding fineness of the final grinding product of high-silver low-tin is 55 to 65 percent when the grinding fineness is-0.074 mm;
the grinding fineness of the final ground ore product of the medium product class is 50 to 55 percent when the fineness is minus 0.074 mm;
the grinding fineness of the final grinding product with low silver and high tin is-0.074 mm and accounts for 45-50%.
7. The method for optimizing the fineness of grinding of Ag-Sn-polymetallic paragenic ore based on raw ore grade ratio as claimed in claim 6, wherein in the ore grinding process,
the grinding fineness of the final grinding product of high-silver and low-tin is-0.074 mm and accounts for 59.55-62.69%;
the grinding fineness of the final ground ore product of the medium product class is 52.57 to 53.08 percent when the fineness is-0.074 mm;
the grinding fineness of the final grinding product of the low-silver high-tin class is-0.074 mm and accounts for 45.53-47.68%.
8. The method for optimizing the fineness of grinding of Ag-Sn-polymetallic paragenic ore based on raw ore grade ratio as claimed in claim 6, wherein in the ore grinding process,
the grinding fineness of the final grinding product of high-silver low-tin class is-0.074 mm and accounts for 59.55 percent;
the grinding fineness of the final ground ore product of the medium product class is 53.08 percent with-0.074 mm;
the grinding fineness of the final ground ore product of the low-silver high-tin class is-0.074 mm and accounts for 47.68 percent.
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