CN109847924B - Beneficiation method for coarse-grained cassiterite in tin-containing polymetallic sulfide ore - Google Patents

Abstract

The invention discloses a method for dressing coarse cassiterite in tin-containing polymetallic sulphide ore, which comprises the steps of firstly pre-grading tin-containing polymetallic sulphide ore, feeding the graded fine fraction ore into a fine cassiterite grading system, feeding the graded coarse fraction ore into a coarse fraction cassiterite grading process, and finally grading coarse tin concentrate with higher tin content after coarse grain desulfurization flotation, vibrating screen grading, spiral chute grading, shaking table coarse scavenging, tin coarse concentrate flotation desulfurization and shaking table concentration of the coarse fraction cassiterite grading process. Promoting the improvement of the technical index and the economic benefit of the cassiterite separation and the technical progress of the ore separation.

Description

A kind of beneficiation method of coarse-grained cassiterite in tin-containing polymetallic sulfide ore

technical field

The invention relates to a beneficiation method for cassiterite, in particular to a beneficiation method for coarse-grained cassiterite in tin-containing polymetallic sulfide ore, and belongs to the technical field of beneficiation.

Background technique

Tin ore is one of the dominant minerals in China, with many associated components and great comprehensive recycling value. Among them, cassiterite (SnO ₂ ) is the main tin-containing mineral recovered. The density of cassiterite is between 6.0-7.0g/cm3, which is larger than that of symbiotic gangue and metal minerals. Gravity beneficiation is a traditional process for recovering cassiterite. The +0.037mm coarse-grained cassiterite has high recovery efficiency and relatively low cost. However, it is difficult to effectively recover the -0.037mm fine-grained cassiterite gravity beneficiation. Cassiterite is brittle and brittle, and argillization and over-pulverization are inevitable in mining, crushing and grinding, resulting in a large amount of -0.037mm fine-grained cassiterite. Uneven, the traditional single gravity beneficiation process has been unable to recover cassiterite minerals of various grades cost-effectively. At the same time, there are few single cassiterite minerals in domestic mineral resources, and cassiterite is mostly associated with other metal sulfide ores, magnetite and other minerals, which further increases the difficulty of comprehensive utilization of resources. With the further expansion of mining and recycling of mineral resources, the selected grades Gradually decline, the recovery rate of cassiterite minerals declines, and the problems of increasing production costs have gradually become prominent.

The shaking table has the characteristics of high enrichment ratio and good separation effect, and is the first choice for the recovery of coarse-grained cassiterite. The influence of many factors, such as the low processing capacity of the shaker, has resulted in a large number of shakers and a large area, resulting in a large number of production series, high production costs, high energy consumption, complex processes, and difficult management and control.

In order to further improve the comprehensive recovery rate of resources and reduce production costs, in recent years, in view of the problem that the gravity separation method has poor recovery effect on fine-grained cassiterite, the fine-grained cassiterite flotation technology has been rapidly developed and applied in industrial production. It effectively solves the problem of difficult recovery of fine-grained cassiterite. At the same time, the combination of coarse-grained cassiterite sorting process equipment is gradually diversified, and the ideas and production applications of pre-sludge and de-coarse reduction to reduce production costs have also gradually increased, reducing the cost of production. Comprehensive recovery cost of cassiterite. However, the economical and efficient comprehensive recovery of cassiterite from cassiterite-containing polymetallic minerals has always been a difficult problem in the field of mineral processing. The innovation of new processes, multi-equipment combinations, and new ideas is also the subject of continuous research and progress in the field of mineral processing.

SUMMARY OF THE INVENTION

In order to improve the comprehensive recovery rate of cassiterite in the cassiterite-containing polymetallic minerals, the object of the present invention is to provide a beneficiation method of coarse-grained cassiterite in a tin-containing polymetallic sulfide ore, which provides a method for the recovery of the coarse-grained cassiterite. It is an economical and efficient way to effectively promote the improvement of cassiterite sorting technical indicators, economic benefits and the development and progress of mineral processing technology.

The technical scheme of the invention is: a beneficiation method for coarse-grained cassiterite in a tin-containing polymetallic sulfide ore. First, the tin-containing polymetallic sulfide ore is pre-classified, and the classified fine-grained ore enters into the fine-grained cassiterite beneficiation method. Classification system, the classified coarse-grained ore enters the coarse-grained cassiterite sorting process, and goes through the coarse-grained cassiterite sorting process of coarse-grained desulfurization flotation, vibrating screen classification, spiral chute sorting, and shaking table rough sweeping. , Flotation desulfurization, shaker selection, and finally the coarse-grained tin concentrate with a tin content of 38-45% is sorted out.

The concrete steps of the mineral processing method of the present invention are as follows:

(1) First, adjust the weight concentration of tin-containing polymetallic sulfide mineral material between 17-25%, and then use a cyclone to pre-classify the particle size of ±0.037mm to ensure that the operating pressure of the cyclone is 0.05-0.15Mpa, and obtain +0.037mm material and -0.037mm material, -0.037mm material enter the fine-grained cassiterite sorting system;

(2) The +0.037mm material of step (1) is subjected to coarse-grained desulfurization and flotation to obtain sulfur concentrate A and tailings, and the tailings enter the vibrating screen classification operation, and the classification size of the vibrating screen is selected to be 0.106-0.180mm, The coarse-grained gangue material on the sieve and the tin-containing material under the sieve are obtained, and the coarse-grained gangue material on the sieve is directly thrown to the tail;

(3) The tin-containing material under the screen in step (2) is subjected to spiral chute separation, enrichment and classification to obtain chute concentrate, chute medium ore and chute tailings. The chute tailings enter the fine-grained cassiterite sorting system, and the chute concentrate The ore in the ore and the chute enters the rough sweeping operation of the shaker, and finally obtains the rough tin concentrate A and the tailings of the rough sweep of the shaker, and the tailings of the rough sweep of the shaker are directly thrown away;

In the step (3), the specific flow of the concentrate in the chute and the ore in the chute entering the rough sweeping operation of the shaker is as follows:

Firstly, the chute concentrate is subjected to shaking table roughing to obtain tin coarse concentrate I, secondary concentrate I, medium ore I and tailings I, respectively. Secondary concentrate II, medium ore II and tailings II, then the chute concentrate, medium ore I and medium ore II obtained by roughing in the chute medium ore shaking table are mixed and then enter the comprehensive medium ore deposit for sweeping to obtain tin coarse concentrate Ⅲ, secondary concentrate Ⅲ, middle ore Ⅲ and tailings Ⅲ, mix the chute concentrate, the tailings I and the tailings II obtained by the roughing of the chute medium ore shaker, and then enter the tailings bed for tailings sweeping to obtain tin coarse. Concentrate Ⅳ, secondary concentrate Ⅳ, medium ore Ⅳ and tailings Ⅳ, among which the middle ore Ⅲ, middle ore Ⅳ and tailings Ⅲ, tailings Ⅳ are combined into shaking table rough sweeping tailings and directly throw the tails, secondary concentrate Ⅰ , secondary concentrate II, secondary concentrate III and secondary concentrate IV are mixed and then enter the first stage of secondary concentrate for sweeping to obtain tin coarse concentrate V, secondary concentrate V, medium ore V and tailings V, and then the intermediate After the ore V and tailings V are mixed, they enter the second stage of secondary concentrate for scavenging to obtain tin coarse concentrate VI, secondary concentrate VI, medium ore VI and tailings VI; Entering into the comprehensive medium ore deposit recycling and re-election, the secondary concentrate V and secondary concentrate VI are both returned to the secondary concentrate first-stage bed for recycling and re-separation; finally, the tin rough concentrates I-VI obtained by each rough sweeping operation shaker are combined to obtain tin. Coarse concentrate A, in which the materials entering the first stage of the secondary concentrate and the comprehensive medium deposit are concentrated by a thickener or a thickening box before entering, and the underflow of the thickener or thickening box is then classified by a cyclone respectively, and the cyclone after classification is used. The sand settling is further reground by vertical stirring mill, and the cyclone overflow is combined with the ore discharge of the vertical stirring mill, and then enters the secondary concentrate and the middle ore deposit respectively.

In the step (3), the process conditions and equipment configuration models of the concentrate in the chute and the ore in the chute entering the rough sweeping operation of the shaker are as follows:

When the chute concentrate is subjected to shaking table roughing, the selected material size of the chute concentrate is controlled to be -0.180mm～+0.063mm, the selected weight concentration is 30～38%, and the coarse sand bed is selected: wave bed: fine sand bed: Grooved bed = 1:2:2:2 cloud tin shaker for configuration and sorting;

When the ore in the chute is subjected to shaking table roughing, the selected material size of the ore in the chute is controlled to be -0.063mm～+0.037mm, the selected weight concentration is 27～32%, and the wave bed is selected: fine sand type: groove type: fine mud bed = 1:1:2:3 cloud-tin shaker for configuration sorting.

The weight concentration of the materials entering the comprehensive middle ore deposit sweeping selection is 25-32%, and the coarse sand bed: fine sand type: groove type: fine mud bed = 1:3:2:1 cloud-tin type shaking table is used to carry out Configuration and sorting, the selected materials entering the tailings bed are selected with a weight concentration of 15-23%, and the fine sand type: groove type: fine mud bed = 2:3:2 cloud tin shaker is used for configuration and sorting.

The selected materials entering the first stage of the secondary concentrate are selected with a weight concentration of 28-35%, and the coarse sand bed is selected: corrugated bed: groove type: fine mud bed = 2:2:2:1 cloud tin shaker The bed is configured and sorted. The selected materials entering the second-stage bed of the secondary concentrate have a selected weight concentration of 20-27%, and the coarse sand bed: fine sand bed: groove type: fine mud bed = 1:2: 3:1 cloud-tin shaker for configuration sorting.

(4) the tin coarse concentrate A in step (3) is concentrated and then subjected to flotation desulfurization to obtain sulfur concentrate B and desulfurized tin coarse concentrate B, and the sulfur concentrate A and sulfur concentrate B are mixed to obtain the final Sulfur concentrate and tin coarse concentrate B enter the shaking table selection operation. After shaking table selection, coarse tin concentrate with a tin content of 38-45% and shaking table selection tailings are finally obtained. The ore is returned to the first-stage bed of the secondary concentrate in the rough-sweeping operation of the shaker in step (3).

The specific process structure and process equipment parameters of the step (4) tin rough concentrate B entering the shaker beneficiation operation are:

The cloud-tin shaker is used for one roughing and two sweeps. The concentration of the selected material in the one roughing shaker is 15-20%. After one roughing, the roughing concentrate and roughing tailings are obtained, and the roughing tailings are obtained. After concentration, adjust the material concentration to 13-20% and enter the sweeping-sweeping-shaker operation to obtain sweeping-one concentrate and sweeping-one tailings. After the sweeping-one tailings are concentrated, adjust the material concentration to 10-15% and enter the sweeping The second-stage shaking table operation is used to obtain the second-stage scavenging concentrate and the second-stage tailings. The beneficiation concentrate, the first sweeping concentrate and the second sweeping concentrate are mixed as the final coarse-grained tin concentrate.

For the rough selection of the first shaker, use the coarse sand bed: wave bed: groove bed: fine mud bed = 1:3:2:1 configuration of the cloud-tin type shaker for sorting, and select the waveform for the sweeping operation of the shaker. Bed: fine sand bed: grooving bed: fine mud bed = 2:2:2:1 configuration of cloud-tin shaker to choose, sweep and select the second shaker operation choose wave bed: groove bed: fine mud bed = 3:3:1 configuration of cloud tin shaker for selection.

(5) The coarse-grained desulfurization and flotation in the step (2) and the flotation and desulfurization treatment of the coarse tin concentrate A in the step (4) all include one roughing, at least two sweeping, and at least two beneficiation, and each The reagents used in the flotation process include activator concentrated sulfuric acid, desulfurization collector DF-336 and foaming agent pine oil. The total consumption of concentrated sulfuric acid activator is 1000-4000g/t according to the selected dry ore, The total consumption of DF-336 desulfurization collector is 40-200g/t according to the selected dry ore, and the total consumption of pine oil foaming agent is 30-100g/t according to the selected dry ore. The added amount of each agent in the selection operation is 60-85% of the total consumption of each agent, and the amount of each agent added in at least the second sweeping operation is 15-40% of the total consumption of each agent.

The amount of each agent added in the first roughing operation is preferably 75-80% of the total consumption of each agent, and the amount of each agent added in at least the second sweeping operation is preferably 20-25% of the total consumption of each agent.

The flotation time of the primary roughing, at least secondary sweeping and at least secondary beneficiation is 4-12 minutes, preferably 6-8 minutes, and the selected material concentration of the primary roughing is 37-50%.

(6) The fine-grained cassiterite flotation operation in the fine-grained cassiterite sorting system is a conventional one-coarse, three-sweep, and three-selection process structure, the selected weight concentration is 30-40%, and the roughing agent is added with 100-400g sodium carbonate /t, activator 200-500g/t, cassiterite collector 1000-2000g/t (the ratio of cassiterite collector is JSY-20) developed and produced by Kunming University of Science and Technology (codenamed "KT-53"): YT-1=3:1, in which the cassiterite collector code-named "JSY-20" was developed and produced by Hubei Jingzhou Pharmaceutical Company, and the cassiterite collector code-named "YT-1" was produced by Hunan Yongtuo Pharmaceutical Company) , auxiliary collector (codenamed "P86") tributyl phosphate 40-150g/t and terpineol oil 20-80g/t, add cassiterite collector respectively 80-200g/t, 30-100g/t and 20-80g/t, no chemicals are added for other sorting operations, and the sorting time for each operation is 6-15min.

(7) The method of the present invention also includes crushing and grinding the raw ore to a particle size of -0.074mm by weight, with a particle size of 65-75% and a concentration of 35-40%, and using a flotation method to first separate other metal sulfide minerals and other metal sulfide minerals. The tailings after the separation of sulfide minerals use magnetic separation to remove magnetite, and obtain other metal sulfide minerals and magnetite and other concentrate products and magnetic separation tailings, and then carry out cassiterite separation.

The characteristics of the present invention are:

(1) Through pre-classification, corresponding beneficiation methods and equipment systems are adopted for the classified materials to separate the coarse and fine tin-containing materials, with strong pertinence.

(2) The spiral chute has the characteristics of large processing capacity, low particle size limit of recovered heavy minerals, can be preselected to improve the selected grade, and can realize the return and sorting of part of the particle size; the shaking table has the characteristics of high sorting grade and enrichment ratio. The bed surface of the bed bar type shaker is optimally configured according to the characteristics of the selected materials. The matching of the specific shaking table equipment and the material characteristics has high sorting efficiency and is conducive to improving the recovery rate of the operation. Features of Spiral Chutes and Shakers Recover coarse-grained cassiterite and improve recovery rates.

(3) The combined process of "heavy-floating-heavy" is used to separate the coarse-grained cassiterite step by step, and the rough scavenging ensures that the recovery rate only produces the cassiterite coarse concentrate, which avoids the waste of resources. Further selection promotes the improvement of concentrate quality to meet the requirements of qualified products, and the economic and social benefits are significant.

(4) Remove the pyrite minerals that affect the separation of cassiterite in steps from the selected materials, and reduce the influence of sulfide minerals on the separation effect and recovery rate of cassiterite during the separation of cassiterite minerals by spiral chute and shaking table equipment. The characteristics of sulfide mineral ore that are similar in density to cassiterite minerals are used to promote the separation of cassiterite and gangue minerals, and then the difference in flotation characteristics between cassiterite and sulfide minerals can be used to completely remove sulfide ore. The separation of ore and cassiterite reduces the loss of tin metal in sulfide ore and gangue, and gradually improves the quality of cassiterite concentrate.

The beneficial effects of the present invention are:

(1) The present invention establishes the coarse and fine separation conditions of +0.037mm coarse-grained cassiterite gravity separation and -0.037mm fine-grained cassiterite flotation through the pre-classification of the cyclone, and the coarse-grained tin-containing materials are sieved by a vibrating screen Realizing the direct tailing of the coarse-grained gangue material on the screen can not only reduce the amount of ore entering the coarse-grained gravity separation process, reduce the number of shakers, but also reduce the production cost.

(2) The present invention adopts the combination of "spiral chute + shaking table" gravity separation equipment, which not only enriches the selected grade of coarse-grained cassiterite, but also uses the chute to classify -0.037mm particles contained in the coarse-grained material. The coarse-grained materials are further separated by the chute pre-selection to narrow-grained materials that are conducive to the configuration and sorting of the shaker process equipment, so as to realize the return of the grains and optimize the composition of the corresponding grains by using different types and quantities of bed strips. Sorting.

(3) The present invention adopts the combined selective coarse-grained tin separation process of "flotation + gravity separation", which can reduce the operation control precision of the cassiterite rough-sweeping shaking table and the grade of tin coarse concentrate, and effectively improve the coarse-grained tin At the same time, the flotation desulfurization process is used to further remove the pyrite that affects the separation of cassiterite, and the high enrichment ratio of the shaking table is used to re-enrich the tin coarse concentrate to select qualified cassiterite concentrate. Mineral products, the tailings of the selected shaker are returned to the chute concentrate shaker for recycling and re-election to avoid the loss of tin metal in the intermediate products.

(4) the technological method of the present invention, the cassiterite concentrate grade and recovery rate after industrial application are obviously improved compared with the full-grain gravity separation method, and the number of shakers is obviously reduced, and the corresponding technical and economic indicators and economic benefits are higher than those of the same type. Mine or conventional cassiterite sorting process has obvious advantages.

Description of drawings

Fig. 1 is the process flow schematic diagram of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Embodiment 1: the zinc-tin-copper polymetallic sulfide ore in a certain place in Yunnan uses the inventive method to carry out cassiterite beneficiation:

1. Raw ore properties:

The raw ore in this area is a primary zinc-tin-copper polymetallic ore with a low degree of oxidation. The metal minerals in the ore are mainly pyrrhotite, followed by chalcopyrite, sphalerite and cassiterite; gangue minerals are chlorite. Mainly, followed by amphibole, pyroxene, quartz, biotite and calcite. The raw ore contains 2.5-4.0% zinc, 0.20-0.40% tin, 0.10-0.22% copper, 10-18% iron, and 4.0-8.5% sulfur; tin minerals are mainly cassiterite, a small amount of tetrahedron Tin and acid-soluble tin, the occupancy rate of cassiterite reaches more than 80%, cassiterite is mainly symbiotic with pyrrhotite, pyrope, chlorite, diopside, quartz and other minerals, and the particle size distribution of cassiterite inlaid is 0.074 Between mm and 0.002mm, most of the cassiterite is sparsely or densely distributed in the gangue in the form of pockmarks. The inlaid particle size of the cassiterite is relatively fine, and the particle size of more than 70% of the cassiterite is less than 0.02mm. Raw ore grinding particle size-200 mesh content of 67-71% under the condition of cassiterite exists as a monomer and dissociates about 50%, there are still some cassiterite and gangue, sphalerite, pyrrhotite minerals coexistence.

2. Mineral beneficiation process:

The original process flow of this site is: flotation copper separation → flotation zinc separation → magnetic separation of iron → flotation desulfurization → shaking table tin separation process.

The beneficiation method of the present invention is applied in this place, and the technological process is changed to: copper flotation → flotation zinc → magnetic iron separation → pre-classification → flotation desulfurization → “coarse grain gravity separation + fine grain flotation” for tin separation The tin selection process is: +0.037mm coarse-grained vibrating screen classification tailing → chute + shaking table rough sweeping → tin coarse concentrate flotation desulfurization + shaking table selection; -0.037mm fine-grained cassiterite flotation , as shown in Figure 1, the specific steps of the method in this embodiment are as follows:

(1) First adjust the weight concentration of tin-containing polymetallic sulfide minerals to 17%, and then use a Φ250mm cyclone to pre-classify tin-containing polymetallic sulfide ore with a particle size of ±0.037mm to ensure that the operating pressure of the cyclone is 0.08 Mpa, +0.037mm material and -0.037mm material are obtained, the particle size and metal distribution parameters of each product are shown in Table 1. -0.037mm material enters the fine-grained cassiterite sorting system, which includes a classification cyclone - 0.037mm material desliming, fine-grained desulfurization and fine-grained cassiterite flotation operations, among which fine-grained cassiterite The flotation operation is a conventional one-coarse, three-sweep and three-fine process structure. The selected weight concentration is 35-40%, and the roughing agent is added with sodium carbonate 200g/t, KT-53 activator 300g/t, cassiterite collector (JSY- 19: YT-1=3:1) 1300-1500g/t, auxiliary collector P86 60g/t and 30g/t pine alcohol oil, add cassiterite collector 100g/t in sweep selection 1, add tin in sweep selection 2 30g/t of stone collector and 40g/t of cassiterite collector for selection one, no chemicals are added for other sorting operations. -8min.

Table 1 The particle size and metal distribution of each product in the pre-classification operation

(2) The +0.037mm material in step (1) is subjected to coarse-grained desulfurization and flotation. The coarse-grained desulfurization and flotation operation is composed of a rough separation, a secondary sweep and a secondary selection process structure. The concentration is 37%. The total consumption of each agent in this coarse-grained desulfurization flotation operation is 1000g/t of concentrated sulfuric acid for activator (calculated according to the amount of selected dry ore) and 60g/t of DF-336 desulfurization collector (based on selected dry ore). ore quantity), terpineol oil foaming agent 30g/t (calculated by the amount of selected dry ore), wherein, the addition amount of each agent in the roughing operation is 70% of the total consumption, and the addition amount of each agent in the secondary sweeping operation is 30% of the total consumption, selected without adding chemicals, and each flotation time is 10min. After coarse-grained desulfurization and flotation, sulfur concentrate A and tailings are obtained. The grading size is 0.106mm, and the over-sieve coarse-grained gangue material of +0.106mm size and the under-sieve tin-containing material of -0.106mm size are obtained, wherein the +0.106mm coarse-grained gangue material on the screen is directly Throwing the tail, removing the coarse-grained gangue minerals with a relative raw mineral rate of 10-12% and a tin metal content of 3-5%;

(3) The tin-containing material under the screen in step (2) is sorted, enriched and classified by a spiral chute with a diameter of Φ900mm to obtain chute concentrate, chute middle ore and chute tailings, and the particle size and metal distribution of each product. See Table 2 for details. The tailings in the chute enter the fine-grained cassiterite sorting system, and the concentrate in the chute and the ore in the chute enter the rough sweeping operation of the shaker. The specific process structure and process equipment configuration parameters are:

First, the chute concentrate is subjected to shaking table roughing, and the selected material particle size of the chute concentrate roughing shaker is controlled to be -0.106mm ~ +0.063mm, and the selected weight concentration is 33%, and the "coarse sand bed: wave bed: Fine sand bed: groove bed = 1:2:2:2" cloud-tin shaker for configuration and separation to obtain tin coarse concentrate I, secondary concentrate I, medium ore I and tailings I respectively; The medium ore is subjected to shaking table roughing, and the particle size of the selected material in the control chute is mainly -0.063mm ~ +0.037mm, the selected weight concentration is 30%, and the "wave bed: fine sand type: groove type: micro mud bed is selected. = 1:1:2:3” cloud-tin shaker for configuration and separation to obtain tin coarse concentrate II, secondary concentrate II, medium ore II and tailings II.

Secondly, the medium ore I and medium ore II obtained by the roughing of the chute concentrate and the chute medium ore shaking table are mixed and then entered into the comprehensive medium ore deposit for sweeping. The selected weight concentration is 25%, and the "coarse sand bed: fine sand type: engraved Channel type: fine mud bed = 1:3:2:1” cloud tin shaker for configuration and separation to obtain tin coarse concentrate III, secondary concentrate III, medium ore III and tailings III; , The tailings I and tailings II obtained by the roughing of the ore shaker in the chute are mixed and then enter the tailings bed for tailings sweeping. The selected weight concentration is 15%, and "fine sand type: groove type: fine mud bed = 2" :3:2” cloud-tin type shaking table for configuration and separation to obtain tin coarse concentrate IV, secondary concentrate IV, medium ore IV and tailings IV, of which medium ore III, medium ore IV and tailings III, tailings IV Mine IV is merged into the rough sweeping tailings of the shaker, and the tailings are directly thrown away.

Further, the secondary concentrate I, secondary concentrate II, secondary concentrate III, and secondary concentrate IV are mixed and then entered into the first-stage bed of secondary concentrate for sweeping selection. The selected weight concentration is 28%, and the "coarse sand bed: corrugated bed" is selected : Grooving type: Fine mud bed = 2:2:2:1” cloud tin shaker for configuration and separation to obtain tin coarse concentrate V, secondary concentrate V, medium ore V and tailings V; The medium ore V and tailings V are mixed and entered into the second-stage bed of the secondary concentrate for sweeping. The 3:1” cloud-tin type shaking table is used for configuration and separation to obtain tin coarse concentrate VI, secondary concentrate VI, medium ore VI and tailings VI; then the medium ore VI and tailings VI are mixed and then entered into the comprehensive medium ore deposit Circulation and re-election, both secondary concentrate V and secondary concentrate VI are returned to the first-stage bed of the secondary concentrate for recycling; preferentially, the materials entering the first-stage bed of the secondary concentrate and the comprehensive middle ore deposit are concentrated by a thickener, and the underflow of the thickener is then separated. A Φ250mm cyclone is used for grading, and the classified cyclone sand is further reground by a vertical stirring mill. The overflow of the cyclone is combined with the ore discharge of the vertical stirring mill, and then enters the first-stage bed of the secondary concentrate respectively. and medium deposits. Finally, the rough tin concentrates I to VI obtained by the shaking table of each rough sweeping operation are combined to obtain the rough tin concentrate A.

Table 2 The particle size and metal distribution of each product in the spiral chute operation

(4) The tin rough concentrate A in step (3) is concentrated and subjected to flotation desulfurization treatment, and the selected concentration of the roughing material is 50%, and one roughing, three sweeping and three cleanings are carried out, wherein each operation is performed. The flotation time is 12min, the total consumption of chemicals is activator concentrated sulfuric acid 4000g/t (calculated by dry ore), DF-336 desulfurization collector 150g/t (calculated by dry ore), foaming agent pinitol Oil 70g/t (calculated by dry ore), the amount of each agent added in the roughing operation is 80% of the total consumption of each agent, and the amount of each agent added in the three-time cleaning operation is 20% of the total consumption of each agent. No chemicals are added in the selection, and sulfur concentrate B and desulfurized tin coarse concentrate B are obtained. After mixing sulfur concentrate A and sulfur concentrate B, the final sulfur concentrate is obtained, and tin coarse concentrate B enters the shaking table selection operation. , The specific process of the selection operation of the shaker is as follows: use a cloud tin shaker for one rough selection and two sweeps, the selected concentration of the first shaker rough selection is 18%, and the first shaker rough selection uses "coarse sand bed: wave bed" : Slotted bed: Micro mud bed = 1:3:2:1” configuration of cloud-tin shaker for sorting to obtain rougher concentrate and rougher tailings with a tin content of 40-45%; roughing The tailings are concentrated to a concentration of 16% and then enter into a sweeping shaker operation. The cloud-tin type shaking table of "wave bed: fine sand bed: groove bed: fine mud bed = 2:2:2:1" is used. It is configured and sorted, and the first sweeping concentrate and sweeping tailings with a tin content of 37-40% are obtained; the first sweeping tailings are concentrated to a concentration of 13% and then enter the second sweeping shaker operation, and the sweeping second For the shaking table operation, the configuration of the cloud-tin type shaking table of "wave bed: groove bed: fine mud bed = 3:3:1" was selected for selection, and the second scavenging concentrate and scavenging concentrate with a tin content of 33-38% were obtained. Select the second tailings, sweep the second tailings (with a tin content between 0.4-0.8%) and return to the first stage of the secondary concentrate in the rough sweeping operation of the shaker in step (3). The ore, sweep-one concentrate and sweep-two concentrate are mixed as the final coarse-grained tin concentrate (tin grade 39-41%).

3. After the technological method of the present invention is applied in the cassiterite sorting process in the zinc-tin-copper polymetallic sulfide ore, the technical parameters and sorting indexes obtained by the quantitative and qualitative examination according to the key process flow structure are shown in Table 3.

Table 3 Technical parameters of cassiterite separation process and tin selection index results in zinc-tin-copper polymetallic sulfide ore in a certain place in Yunnan

4, the tin index contrast before and after the application of the method of the present invention:

See Table 4 for the comparison results of the tin selection technical indicators before and after the method of the present invention is applied in the cassiterite sorting process in the zinc-tin-copper polymetallic sulfide ore in this place. From the data in Table 4, it can be seen that after the application of the process flow of the method of the present invention, the recovery rate of tin concentrate is increased by 5.80% compared with 45.22% before application, and the technical effect is obvious.

Table 4. Index comparison table before and after application of the technology of the present invention in the cassiterite sorting process in a zinc-tin-copper polymetallic sulfide ore in a certain place in Yunnan

Embodiment 2: apply the inventive method to carry out the beneficiation of cassiterite for copper-tin sulfide ore in a certain place in Yunnan:

1. Raw ore properties:

The raw ore is a primary copper-tin symbiotic ore. The metal minerals in the ore are mainly chalcopyrite, followed by pyrrhotite, magnetite and cassiterite; the gangue minerals are mainly quartz and calcite, followed by pyroxene and biotite. Wait. The raw ore contains 0.4-1.0% copper, 0.12-0.25% tin, 5-10% iron, and 2.0-4.0% sulfur; tin minerals are mainly cassiterite, and the occupancy rate of cassiterite is over 95%. The particle size distribution of stone inlaid cloth is between 0.053mm-0.02mm. Crude ore grinding particle size-200 mesh content is 62-72% under the condition that cassiterite exists as a monomer and dissociates about 65%.

2. Mineral beneficiation process:

Before the application of the present invention: flotation copper separation → magnetic separation of iron → flotation desulfurization → shaking table tin separation process.

After the application of the invention: flotation copper separation → magnetic separation of iron → pre-classification + fine mud desliming and tailing → flotation desulfurization → vibrating screen classification coarse-grained gangue tailing + spiral chute + shaking table for tin selection + tin coarse refining Ore desulfurization + desulfurization post-desulfurization tin coarse concentrate shaker selection process flow, the specific steps are as follows:

(1) Crushing and grinding the raw ore to a particle size of -0.074mm by weight, with a particle size of 65% and a concentration of 34%, using the flotation method to first flotate the copper minerals, and using the magnetic separation method to remove the magnetite from the copper tailings. , respectively, to obtain two concentrate products of copper and iron and magnetic separation tailings material, and use a Φ300mm type cyclone to pre-classify the magnetic separation tailings with a particle size of ±0.037mm to ensure that the operating pressure of the cyclone is 0.10Mpa, The +0.037mm material and the -0.037mm material are obtained. The -0.037mm material is further used for desliming with a Φ75mm type cyclone. After desliming, the settled sand enters the fine-grained cassiterite flotation system. The mud is directly thrown into the tail;

(2) The +0.037mm material of step (1) is subjected to coarse-grained desulfurization and flotation to remove pyrite, and the coarse-grained desulfurization and flotation operation is composed of primary roughing, secondary sweeping and secondary beneficiation process flow, The concentration of the selected material in the roughing is 42%. The total consumption of each agent in the coarse-grained desulfurization and flotation operation is 1500g/t of concentrated sulfuric acid for activator (calculated by the amount of selected dry ore), and 40g/t of DF-336 desulfurization collector. t (calculated by the amount of selected dry ore), 30g/t of terpineol oil foaming agent (calculated by the amount of selected dry ore), among which, the addition amount of each agent in the roughing operation is 90% of the total consumption, and the secondary sweeping operation The amount of each agent added is 10% of the total consumption, and no agent is added in the selection. The flotation time of each operation in the rough sweeping section is 8 minutes, and the flotation time of each operation in the selection section is 5 minutes. Sulfur concentrate A and tailings are obtained, the tailings enter the vibrating screen classification operation, and the classification size of the vibrating screen is selected to be 0.125mm, and the on-screen and -0.125mm of the coarse-grained gangue material on the screen with a particle size of +0.125mm are obtained. The tin-containing material under the sieve of the particle size, in which the +0.125mm coarse-grained gangue material on the sieve is directly thrown to the tail;

(3) The tin-containing material under the screen in step (2) is sorted, enriched and classified by a spiral chute with a diameter of Φ1200mm to obtain chute concentrate, chute medium ore and chute tailings, and the chute tailings enter the fine-grained cassiterite separation process. According to different systems, the concentrate in the chute and the ore in the chute enter the rough sweeping operation of the shaker. The specific process structure, process parameters and equipment configuration are as follows:

First, the chute concentrate and the chute medium ore are respectively subjected to shaking table roughing, which ensures that the material particle size of the chute concentrate is -0.125mm ~ +0.063mm, the selected weight concentration is 34%, and the "coarse sand bed: wave bed: Fine sand bed: groove bed = 1:2:2:2" cloud-tin shaker for configuration and separation to obtain tin coarse concentrate I, secondary concentrate I, medium ore I and tailings I respectively; The medium ore is subjected to shaking table roughing, and the particle size of the selected material in the control chute is mainly -0.063mm～+0.037mm, and the selected weight concentration is 32%, and the "wave bed: fine sand type: groove type: micro mud bed is selected. = 1:1:2:3” cloud-tin shaker for configuration and separation to obtain tin coarse concentrate II, secondary concentrate II, medium ore II and tailings II. Secondly, the medium ore I and medium ore II obtained by the roughing of the chute concentrate and the chute medium ore shaker are mixed and then entered into the comprehensive medium ore deposit for sweeping. The selected weight concentration is 27%, and the "coarse sand bed: fine sand type: engraved Channel type: fine mud bed = 1:3:2:1” cloud tin shaker for configuration and separation to obtain tin coarse concentrate III, secondary concentrate III, medium ore III and tailings III; , The tailings I and tailings II obtained by the roughing of the ore shaker in the chute are mixed and entered into the tailings bed for tailings sweeping. The selected weight concentration is 20%, and "fine sand type: groove type: fine mud bed = 2" :3:2” cloud-tin type shaking table for configuration and separation to obtain tin coarse concentrate IV, secondary concentrate IV, medium ore IV and tailings IV, of which medium ore III, medium ore IV and tailings III, tailings IV Mine IV is merged into the rough sweeping tailings of the shaker, and the tailings are directly thrown away.

Further, the secondary concentrate I, secondary concentrate II, secondary concentrate III, and secondary concentrate IV are mixed and then entered into the first-stage bed of secondary concentrate for sweeping. The selected weight concentration is 30%, and the "coarse sand bed: corrugated bed" : Grooving type: Fine mud bed = 2:2:2:1” cloud tin shaker for configuration and separation to obtain tin coarse concentrate V, secondary concentrate V, medium ore V and tailings V; After mixing medium ore V and tailings V, they enter the second stage of secondary concentrate for scavenging, and the selected weight concentration is 23%. The 3:1” cloud-tin type shaking table is used for configuration and separation to obtain tin coarse concentrate VI, secondary concentrate VI, medium ore VI and tailings VI; then the medium ore VI and tailings VI are mixed and then entered into the comprehensive medium ore deposit Circulation and re-election, both secondary concentrate V and secondary concentrate VI are returned to the first-stage bed of the secondary concentrate for recycling; preferentially, the materials entering the first-stage bed of the secondary concentrate and the comprehensive middle ore deposit are concentrated by a thickener, and the underflow of the thickener is then separated. A Φ300mm cyclone is used for grading, and the classified cyclone sand is further reground by a vertical stirring mill. The overflow of the cyclone is combined with the ore discharge of the vertical stirring mill and then enters the first-stage bed of the secondary concentrate respectively. and medium deposits. Finally, the rough tin concentrates I to VI obtained by the shaking table of each rough sweeping operation are combined to obtain the rough tin concentrate A.

(4) The tin rough concentrate A in step (3) is concentrated and then subjected to flotation desulfurization treatment, and the selected concentration of the roughing material is 37%, and a roughing, secondary sweeping and secondary beneficiation are carried out, wherein each The flotation time of the second operation is 6-8min, and the total consumption of chemicals is 1500g/t of concentrated sulfuric acid for activator (calculated by dry ore) and 70g/t of DF-336 desulfurization collector (calculated by dry ore). Foaming agent pine alcohol oil 40g/t (calculated by dry ore), the addition amount of each agent in the roughing operation is 85% of the total consumption of each agent, and the amount of each agent added in the secondary sweeping operation is the total consumption of each agent 15% of the sulphur concentrate B and the desulfurized tin coarse concentrate B are obtained without adding chemicals for the secondary beneficiation. Enter the shaker selection operation. The specific process of the shaker selection operation is as follows: the selected concentration of the first shaker rough selection is 15%, and the selection of "coarse sand bed: wave bed: groove bed: micro mud bed = 1:3:2 :1” configuration of cloud-tin shaker for sorting to obtain rougher concentrates and rougher tailings with a tin content of 39-43%; rougher tailings are concentrated to a concentration of 13% and then enter the first sweeping selection process. For the shaker operation, select the configuration of the cloud-tin type shaker of "wave bed: fine sand bed: groove bed: fine mud bed = 2:2:2:1", and obtain a tin-containing grade of 36-42%. Sweep one concentrate and sweep one tailings; Sweep one tailings are concentrated to a concentration of 12% and then enter into the second sweeping shaker operation. Bed = 3:3:1” configuration of cloud-tin shaker for sorting, to obtain the second sweeping concentrate and sweeping second tailings with a tin content of 35-38%, and sweeping second tailings (tin-containing grade 35-38%) between 0.3-0.5%) return to step (3) in the first stage of the secondary concentrate in the roughing operation of the shaker, and mix the roughing concentrate, the first-sweeping concentrate and the second-sweeping concentrate Then as the final coarse-grained tin concentrate (39-44% tin grade).

After the method of the invention is applied in the cassiterite sorting process in the copper-tin sulfide ore in this area, the recovery rate of tin concentrate is increased by 3.8% compared with that before the application, and the technical effect is obvious.

Embodiment 3: apply the method of the present invention to tin selection for cassiterite polymetallic sulfide ore in a certain place in Guangxi: the raw ore contains useful metals of tin, zinc, lead, antimony and indium, and the cassiterite is based on coarse-grained cassiterite. The inventive method carries out coarse-grained cassiterite sorting, and the concrete steps are as follows:

(1) Crushing and grinding the raw ore until the particle size of -0.074mm by weight accounts for 70% and the concentration is 40%. The flotation method is used for the flotation of the sulfide ore first, and the flotation tailings of the sulfide ore are made of Φ250mm type. The cyclone is pre-classified with a particle size of ±0.037mm to ensure that the operating pressure of the cyclone is 0.12Mpa, and the +0.037mm material and the -0.037mm material are obtained, and the -0.037mm material enters the fine-grained cassiterite sorting system;

(2) The +0.037mm material in step (1) is subjected to coarse-grained desulfurization and flotation. The coarse-grained desulfurization and flotation operation is composed of primary roughing, secondary sweeping and secondary beneficiation. The total consumption of each agent in this coarse-grained desulfurization flotation operation is 4000g/t of concentrated sulfuric acid for activator (calculated according to the amount of selected dry ore) and 200g/t of DF-336 desulfurization collector (based on selected dry ore). 100g/t of terpineol oil foaming agent (calculated according to the amount of selected dry ore), wherein, the amount of each agent added in the roughing operation is 85% of the total consumption, and the amount of each agent added in the secondary sweeping operation is the total 15% of the consumption, no chemicals are added, and each flotation time is 7 minutes. After coarse-grained desulfurization and flotation, sulfur concentrate I and tailings are obtained. The tailings enter the vibrating screen classification operation, and the vibrating screen classification is selected The size is 0.180mm, and the over-sieve and -0.180mm under-sieve tin-containing material of the +0.180mm particle size of the coarse-grained gangue material on the screen is obtained, and the +0.180mm coarse-grained gangue material on the screen is directly thrown away tail;

(3) The tin-containing material under the screen in step (2) is sorted, enriched and classified by a spiral chute with a diameter of Φ1200mm to obtain chute concentrate, chute medium ore and chute tailings, and the chute tailings enter the fine-grained cassiterite separation process. Different systems, the concentrate in the chute and the ore in the chute enter the rough sweeping operation of the shaker. The specific process is as follows:

First, the chute concentrate and the chute medium ore are respectively subjected to shaking table roughing, which ensures that the material size of the chute concentrate is -0.180mm ~ +0.063mm, the selected weight concentration is 30%, and the "coarse sand bed: wave bed: Fine sand bed: groove bed = 1:2:2:2" cloud-tin shaker for configuration and separation to obtain tin coarse concentrate I, secondary concentrate I, medium ore I and tailings I respectively; The medium ore is subjected to shaking table roughing, and the particle size of the selected material in the control chute is mainly -0.063mm ~ +0.019mm, the selected weight concentration is 25%, and the "wave bed: fine sand type: groove type: micro mud bed is selected. = 1:1:2:3” cloud-tin shaker for configuration and separation to obtain tin coarse concentrate II, secondary concentrate II, medium ore II and tailings II. Secondly, the medium ore I and medium ore II obtained from the roughing of the chute concentrate and the chute medium ore shaker are mixed and entered into the comprehensive medium ore deposit for sweeping. The selected weight concentration is 32%, and the "coarse sand bed: fine sand type: engraved Channel type: fine mud bed = 1:3:2:1” cloud tin shaker for configuration and separation to obtain tin coarse concentrate III, secondary concentrate III, medium ore III and tailings III; , The tailings I and tailings II obtained by the roughing of the ore shaker in the chute are mixed and then enter the tailings bed for tailings sweeping. The selected weight concentration is 23%, and "fine sand type: groove type: fine mud bed = 2" :3:2” cloud-tin type shaking table for configuration and separation to obtain tin coarse concentrate IV, secondary concentrate IV, medium ore IV and tailings IV, of which medium ore III, medium ore IV and tailings III, tailings IV Mine IV is merged into the rough sweeping tailings of the shaker, and the tailings are directly thrown away.

Further, the secondary concentrate I, secondary concentrate II, secondary concentrate III, and secondary concentrate IV are mixed and then entered into the first-stage bed of secondary concentrate for sweeping selection. The selected weight concentration is 35%, and the "coarse sand bed: corrugated bed" is selected. : Grooving type: Fine mud bed = 2:2:2:1” cloud tin shaker for configuration and separation to obtain tin coarse concentrate V, secondary concentrate V, medium ore V and tailings V; The medium ore V and tailings V are mixed and entered into the second-stage bed of the secondary concentrate for sweeping. The 3:1” cloud-tin type shaking table is used for configuration and separation to obtain tin coarse concentrate VI, secondary concentrate VI, medium ore VI and tailings VI; then the medium ore VI and tailings VI are mixed and then entered into the comprehensive medium ore deposit Circulation and re-election, both secondary concentrate V and secondary concentrate VI are returned to the first-stage bed of the secondary concentrate for recycling; preferentially, the materials entering the first-stage bed of the secondary concentrate and the comprehensive middle ore deposit are concentrated by a thickener, and the underflow of the thickener is then separated. A Φ300mm cyclone is used for grading, and the classified cyclone sand is further reground by a vertical stirring mill. The overflow of the cyclone is combined with the ore discharge of the vertical stirring mill and then enters the first-stage bed of the secondary concentrate respectively. and medium deposits. Finally, the rough tin concentrates I to VI obtained by the shaking table of each rough sweeping operation are combined to obtain the rough tin concentrate A.

(4) The tin rough concentrate I in step (3) is concentrated and then subjected to flotation desulfurization treatment, and the selected concentration of the roughing material is 38%, and a roughing, secondary sweeping and secondary beneficiation are carried out, wherein each The stage flotation time is 6min, and the total consumption of chemicals is activator concentrated sulfuric acid 4000g/t (calculated by dry ore), DF-336 desulfurization collector 200g/t (calculated by dry ore), foaming agent pinitol Oil 100g/t (calculated by dry ore), the amount of each agent added in the roughing operation is 60% of the total consumption of each agent, and the amount of each agent added in the secondary sweeping operation is 40% of the total consumption of each agent. No chemicals are added for the second beneficiation, each time the sulfur concentrate II and the desulfurized tin coarse concentrate II are obtained, the sulfur concentrate II is mixed with the sulfur concentrate I to obtain the final sulfur concentrate, and the tin coarse concentrate II enters the shaking table Selection operation, the specific process of the selection operation of the shaker is as follows: use a cloud tin shaker for one rough selection and two sweeps, the selected concentration of the first shaker rough selection is 10%, and the first shaker rough selection press "coarse sand bed" : corrugated bed: grooved bed: fine mud bed = 1:3:2:1” cloud-tin shaker for configuration and separation to obtain tin-containing rougher concentrate and rougher tailings. The rougher tailings are processed by After concentrating to 8%, enter the sweeping and selecting shaker operation, and configure the cloud-tin shaker of "wave bed: grooved bed: fine mud bed = 3:3:1" for selection, and get the sweeping selection one. Concentrate and sweep the first tailings, sweep the first tailings to be concentrated to 12% and then enter the sweeping second shaker operation, press "wave bed: grooved bed: fine mud bed = 2:2:3" The cloud-tin type shaking table is configured for sorting, and the second sweeping concentrate and the second sweeping tailing are obtained. The concentrate, sweep-one concentrate and sweep-two concentrate are mixed as the final coarse-grained tin concentrate (tin grade 38-45%).

After the method of the invention is applied to the local cassiterite polymetallic sulfide ore, the recovery rate of tin concentrate is increased by 4.59% compared with that before the application, and the technical effect is obvious.

Embodiment 4: The method of this embodiment is the same as that of Embodiment 3, the difference is that in the step (4), the tin coarse concentrate I is concentrated and then subjected to flotation desulfurization treatment, which is subjected to primary roughing, secondary sweeping and two For the second selection, the addition amount of each agent in the roughing operation is 80% of the total consumption of each agent, and the addition amount of each agent in the secondary sweep operation is 20% of the total consumption of each agent, and the second selection is not added. The chemical agent is used to obtain sulfur concentrate II and desulfurized tin rough concentrate II.

After the treatment in this example, the recovery rate of the finally obtained tin concentrate is obviously increased by 4.69% compared with that before the application of the present invention.

The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and can also be made within the scope of knowledge possessed by those of ordinary skill in the art without departing from the purpose of the present invention. Various changes.

Claims (9)

1. The beneficiation method for the coarse-grained cassiterite in the tin-containing multi-metal sulphide ore is characterized by comprising the following steps of firstly pre-grading the tin-containing multi-metal sulphide ore, enabling the graded fine-grained cassiterite to enter a fine-grained cassiterite grading system, enabling the graded coarse-grained cassiterite to enter a coarse-grained cassiterite grading process, and finally grading coarse-grained tin concentrate with a tin grade of 38-45% through coarse-grained desulfurization flotation, vibrating screen grading, spiral chute grading, shaking table coarse scavenging, tin coarse concentrate flotation and desulfurization and shaking table concentration in the coarse-grained cassiterite grading process, wherein the specific steps of the beneficiation method are as follows:

(1) firstly, adjusting the weight concentration of tin-containing polymetallic sulphide ore materials to 17-25%, then carrying out +/-0.037 mm size fraction pre-classification by using a cyclone, ensuring the operating pressure of the cyclone to be 0.05-0.15 Mpa, obtaining +0.037mm materials and-0.037 mm materials, and enabling the-0.037 mm materials to enter a fine-grain cassiterite sorting system;

(2) performing coarse grain desulfurization flotation on the material with the grain size of +0.037mm obtained in the step (1) to obtain sulfur concentrate A and tailings, performing classification operation on the tailings by using a vibrating screen, selecting the classification size of the vibrating screen to be 0.106-0.180 mm to obtain an oversize coarse grain gangue material and an undersize tin-containing material, and directly discarding the oversize coarse grain gangue material;

(3) performing spiral chute sorting, enrichment and grading on the undersize stanniferous materials obtained in the step (2) to obtain chute concentrates, chute middlings and chute tailings, enabling the chute tailings to enter a fine-grain cassiterite sorting system, enabling the chute concentrates and the chute middlings to enter shaking table rough scavenging operation to finally obtain stannum rough concentrates A and shaking table rough scavenging tailings, and directly throwing tails by using the shaking table rough scavenging tailings;

(4) and (3) concentrating the tin rough concentrate A in the step (3), and then carrying out flotation desulfurization treatment to obtain a sulfur concentrate B and a desulfurized tin rough concentrate B, mixing the sulfur concentrate A and the sulfur concentrate B to obtain a final sulfur concentrate, carrying out table concentration operation on the tin rough concentrate B to obtain coarse-grained tin concentrate with tin grade of 38-45% and table concentration tailings, and returning the table concentration tailings to the table rough scavenging operation in the step (3) to form closed cycle.

2. The method for beneficiating coarse fraction cassiterite from tin-bearing polymetallic sulphide ores according to claim 1, characterized in that: the concrete flow of the chute concentrate and the chute middlings entering the table rough scavenging operation in the step (3) is as follows:

firstly, carrying out table roughing on chute concentrates to respectively obtain tin rough concentrates I, inferior concentrates I, middlings I and tailings I, carrying out table roughing on chute middlings to respectively obtain tin rough concentrates II, inferior concentrates II, middlings II and tailings II, then mixing the chute concentrates and the middlings I and II obtained by table roughing of the chute middlings and entering a comprehensive middling bed for scavenging to obtain tin rough concentrates III, inferior concentrates III, middlings III and tailings III, mixing the chute concentrates and the tailings I and II obtained by table roughing of the chute middlings and the tailings II and entering a tailing bed for scavenging to obtain tin rough concentrates IV, inferior concentrates IV, middlings IV and tailings IV, wherein the middlings III, the middlings IV, the middlings III, the tailings III and the tailings IV are combined to form table roughing tailings, directly throwing tailings, the inferior concentrates I, the inferior concentrates II, the inferior concentrates III and the inferior concentrates IV are mixed and then enter the inferior concentrates bed for primary scavenging, obtaining a tin rough concentrate V, a secondary concentrate V, a middling V and a tailing V, mixing the middling V and the tailing V, and then feeding the mixture into a secondary concentrate secondary bed for scavenging to obtain a tin rough concentrate VI, a secondary concentrate VI, a middling VI and a tailing VI; then mixing the middling VI and the tailings VI, and then entering a comprehensive middling bed for circular recleaning, wherein the secondary concentrate V and the secondary concentrate VI are both returned to the primary concentrate for circular recleaning on a first-stage bed; and finally, combining the tin rough concentrates I-VI obtained by the rough sweeping operation shaking tables to obtain tin rough concentrate A, wherein materials entering the first-stage bed of the secondary concentrate and the comprehensive middle ore bed are concentrated by adopting a thickener or a thickening box before entering, the bottom flow of the thickener or the thickening box is classified by adopting a cyclone respectively, the settled sand of the cyclone after classification is further reground by adopting a vertical stirring mill, the overflow of the cyclone is combined with the ore discharge of the vertical stirring mill and then enters the first-stage bed of the secondary concentrate and the middle ore bed respectively.

3. The method for beneficiating coarse-grained cassiterite from tin-bearing polymetallic sulphide ores according to claim 2, characterized in that:

when the chute concentrate is subjected to table roughing, the granularity of the selected material of the chute concentrate is controlled to be-0.180 mm- +0.063mm, the selected weight concentration is 30-38%, and a coarse sand bed is selected: a wave-shaped bed: fine sand bed: configuring and sorting a cloud tin type shaking table with a grooved bed =1:2:2: 2;

when the chute middlings are subjected to table roughing, the granularity of selected materials of the chute middlings is controlled to be-0.063 mm- +0.037mm, the selected weight concentration is 27-32%, and a wave-shaped bed is selected: fine sand mold: groove carving: carrying out configuration and sorting on a cloud tin type shaking table with the fine mud bed =1:1:2: 3;

the concentration by weight of the material entering the comprehensive middling bed scavenging is 25-32%, and a coarse sand bed is selected: fine sand mold: groove carving: configuring and sorting a cloud tin type shaking table with a fine mud bed =1:3:2:1, wherein the selected weight concentration of materials entering a tailing bed is 15-23%, and a fine sand mold is selected: groove carving: carrying out configuration and sorting on a cloud tin type shaking table with the fine mud bed =2:3: 2;

the concentration by weight of the selected materials entering the first-stage bed separation of the secondary concentrate is 28-35%, and a coarse sand bed is selected: a wave-shaped bed: groove carving: configuring and sorting a fine mud bed =2:2:2:1 cloud tin type table concentrator, wherein the selected weight concentration of the materials entering the secondary concentrate secondary bed for sorting is 20-27%, and a coarse sand bed is selected: fine sand bed: groove carving: and (4) carrying out configuration and sorting on a cloud tin type shaking table with the fine mud bed =1:2:3: 1.

4. The method for beneficiating coarse fraction cassiterite from tin-bearing polymetallic sulphide ores according to claim 1, characterized in that: the specific process of the tin rough concentrate B entering the table concentration operation in the step (4) is as follows:

and (3) carrying out primary roughing and two scavenging by adopting a tin cloud shaking table, wherein the concentration of the selected material of the primary shaking table roughing is 15-20%, roughing concentrate and roughing tailings are obtained through the primary shaking table roughing, the roughing tailings are concentrated and then adjusted to have the concentration of 13-20%, the concentrated material enters a scavenging first shaking table operation to obtain scavenging first concentrate and scavenging first tailings, the scavenging first tailings are concentrated and then adjusted to have the concentration of 10-15%, the scavenging first tailings enter a scavenging second shaking table operation to obtain scavenging second concentrate and scavenging second tailings, the scavenging second tailings are returned to the secondary concentrate in the shaking table roughing operation in the step (3), and the roughing concentrate, the scavenging first concentrate and the scavenging second concentrate are mixed to be used as final coarse tin concentrate.

5. The method according to claim 4, characterized in that: the primary shaking table rough selection adopts a coarse sand bed: a wave-shaped bed: a grooving bed: sorting is carried out by configuring a cloud tin type shaking table with fine mud bed =1:3:2:1, and a wave-shaped bed is selected for the operation of a shaking table: fine sand bed: a grooving bed: sorting by configuration of a cloud tin type shaking table with a fine mud bed =2:2:2:1, and selecting a wave-shaped bed by operation of a second sweeping shaking table: a grooving bed: sorting by configuration of a yunxin type shaking table with fine mud bed =3:3: 1.

6. The method for beneficiating coarse fraction cassiterite from tin-bearing polymetallic sulphide ores according to claim 1, characterized in that: the coarse grain desulfurization flotation in the step (2) and the flotation desulfurization treatment of the tin rough concentrate A in the step (4) comprise primary roughing, at least secondary scavenging and at least secondary concentration, and the reagents used in each flotation process comprise activating agent concentrated sulfuric acid, desulfurization collecting agent DF-336 and foaming agent pine oil, wherein the total consumption of the activating agent concentrated sulfuric acid is 1000-4000g/t in terms of the amount of dry ores to be selected, the total consumption of the DF-336 desulfurization collecting agent is 40-200g/t in terms of the amount of dry ores to be selected, the total consumption of the foaming agent of the pine oil is 30-100g/t in terms of the amount of dry ores to be selected, the addition amount of each reagent in the roughing operation is 60-85% of the total consumption of each reagent, and the addition amount of each reagent in at least secondary scavenging operation is 15-40% of the total consumption of each reagent.

7. The method according to claim 6, characterized in that: the addition amount of each medicament in the primary roughing operation is 75-80% of the total consumption amount of each medicament, and the addition amount of each medicament in at least the secondary scavenging operation is 20-25% of the total consumption amount of each medicament.

8. The method according to claim 6, characterized in that: the flotation time of the primary roughing, the at least secondary scavenging and the at least secondary concentrating is 4-12min, and the concentration of the selected materials in the primary roughing is 37-50%.

9. The method of beneficiation of coarse fraction cassiterite from tin-containing polymetallic sulphide ores according to claim 8, characterized in that: the flotation time of the primary roughing, the at least secondary scavenging and the at least secondary concentrating is 6-8 min.

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