Method for improving tin recovery rate by regrinding and reselecting ore ceramic balls in table concentrator

Abstract

The invention belongs to the technical field of mineral separation, and particularly relates to a method for improving the tin recovery rate through mineral ceramic ball regrinding and recleaning in a shaking table. According to the method, ore in a tin ore table is ground, ore pulp is obtained, and an ore grinding medium used for ore grinding comprises ceramic balls; carrying out desulfurization flotation on the ore pulp to obtain sulfur concentrate and flotation tailings; and the flotation tailings are subjected to shaking table gravity separation operation, and tin concentrate is obtained. According to the method, a porcelain ball grinding and floating weight combined method is adopted for tin ore table middling, argillization of tin ore can be relieved from the source, monomer dissociation of the ore is improved, the influence of iron pollution on desulfurization is reduced, the grade and the recovery rate of tin concentrate are improved, efficient recycling of tin resources is guaranteed, and the method is suitable for industrial production. And the method has important significance for improving the tin ore recovery rate. Meanwhile, the method has the advantages of being low in energy consumption, easy to operate, low in sorting cost and the like, the tin recovery rate can be increased by 3-5%, and economic benefits are obvious.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and particularly relates to a method for improving the tin recovery rate by regrinding and re-selecting porcelain balls in a shaking table. Background Art

[0002] Tin ore is a vital mineral resource, widely used in the electronics, ceramics, metallurgy, and chemical industries. Tin ore primarily originates from cassiterite. Crushing and grinding are typically used to separate the tin ore from gangue minerals, followed by recycling through gravity separation, flotation, magnetic separation, and roasting. However, tin ore is brittle and prone to mudification and over-crushing during grinding, resulting in generally low cassiterite recovery rates.

[0003] At present, the recovery of fine-grained cassiterite mainly adopts flotation-gravity separation, flotation-magnetic separation, combined metallurgy process, high-efficiency flotation reagents, and high-efficiency equipment to achieve cassiterite recovery.

[0004] Related technologies have proposed a method for recycling fine-grained cassiterite, using a combined flotation-gravity separation process. This involves flotation with a combined collector, followed by gravity separation of the tin flotation concentrate, ultimately yielding a tin concentrate with a grade of 40-50%. Related technologies have proposed a method for separating and recovering tin from tin-containing tailings from beneficiation. The tin tailings are pelletized and then heated and roasted in a weakly reducing atmosphere. The tin in the tailings is reduced and volatilized into dust, and the tin is then recovered from the tin-containing dust. Related technologies have proposed a combined gravity separation method for the comprehensive recovery of tungsten and tin, namely, a combined process of a roughing shaker, a scavenging shaker, flotation, secondary flotation in a flotation classification tank, a fine shaker flotation, drying and dehydration, and magnetic separation and classification. This method can yield a tungsten concentrate with a grade of over 65% and a tin concentrate with a grade of over 45%. Related technologies propose a tin ore beneficiation shaking table and a tin ore beneficiation method, which divides the flotation tailings into three particle sizes of +0.075mm, -0.075+0.038mm, and -0.038mm, and then uses a beneficiation shaking table to achieve cassiterite re-selection recovery.

[0005] In summary, existing beneficiation or combined beneficiation and smelting methods can achieve the recovery of fine-grained tin to a certain extent. However, fine-grained grinding still suffers from low grinding efficiency, high energy consumption, and insufficient mineral dissociation, resulting in low tin metal recovery rates. Summary of the Invention

[0006] The object of the present invention is to provide a method for improving the tin recovery rate by regrinding and reselecting tin ore from a shaking table porcelain ball. The method provided by the present invention has the advantages of high efficiency, low energy consumption, easy operation and low selection cost. At the same time, it can improve the grade and recovery rate of tin concentrate, ensure the efficient recycling and utilization of tin resources, and have obvious economic benefits.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a method for improving the tin recovery rate by regrinding and reselecting mineral porcelain balls in a shaking table, comprising the following steps:

[0009] Grinding the tin ore in a shaking table to obtain slurry, wherein the grinding medium used in the grinding includes porcelain balls;

[0010] The slurry is subjected to desulfurization flotation to obtain sulfur concentrate and flotation tailings, wherein the desulfurization flotation includes desulfurization roughing, desulfurization cleaning and desulfurization scavenging;

[0011] The flotation tailings are subjected to a shaking table gravity separation operation to obtain tin concentrate, wherein the shaking table gravity separation operation includes a primary roughing operation.

[0012] Preferably, the tin ore shaking table middlings include fine mud shaking table concentrates and / or coarse-grained shaking table middlings of co-existing tin ores; the co-existing tin ores include one or more of cassiterite-sulfide skarn ore, cassiterite-magnetite skarn ore, cassiterite-sulfide ore and cassiterite-quartz ore.

[0013] Preferably, before the grinding, the method further comprises concentrating the tin ore in the shaking table to obtain a concentrated underflow; and grinding the concentrated underflow;

[0014] The mass content of solids in the concentrated underflow is 70-85%; the fineness of the concentrated underflow is -1mm; and the equipment used for the concentration includes a hydrocyclone or a spiral classifier.

[0015] Preferably, the filling rate of the grinding medium is 15-40%;

[0016] The porcelain balls include at least two of the following: first-level porcelain balls, second-level porcelain balls, third-level porcelain balls and fourth-level porcelain balls. The particle size of the first-level porcelain balls is 20 mm, the particle size of the second-level porcelain balls is 25 mm, the particle size of the third-level porcelain balls is 30 mm, and the particle size of the fourth-level porcelain balls is 35 mm.

[0017] Preferably, the grinding medium also includes steel balls, the filling rate of steel balls in the grinding medium is 3-6%, the steel balls include any one of primary steel balls, secondary steel balls, tertiary steel balls and quaternary steel balls, the particle size of the primary steel balls is 20 mm, the particle size of the secondary steel balls is 25 mm, the particle size of the tertiary steel balls is 30 mm, and the particle size of the quaternary steel balls is 35 mm.

[0018] Preferably, the grinding concentration is 60-75%, and the equipment used for the grinding includes a ball mill or a vertical stirred mill;

[0019] After the grinding is completed, an initial ore pulp is obtained, and the initial ore pulp is further classified to obtain an ore pulp, wherein the mass content of solid ore particles with a particle size of -0.075 mm in the ore pulp is 40-75%, and the equipment used for the classification includes any one of a spiral classifier, a hydrocyclone and a high-frequency fine screen.

[0020] Preferably, the desulfurization roughing obtains roughing concentrate and roughing tailings, the roughing concentrate is subjected to desulfurization roughing, the roughing tailings are subjected to desulfurization scavenging, the desulfurization roughing obtains sulfur concentrate and scavenged tailings, the desulfurization scavenging obtains scavenged concentrate and flotation tailings, and the scavenged tailings and scavenged concentrate are returned to the desulfurization roughing.

[0021] Preferably, the desulfurization roughing uses a roughing agent, which includes an activator, a first collector and a first foaming agent. The activator is copper sulfate, and the mass ratio of the activator to the tin ore shaking table ore is 300-400 g / t. The first collector is butyl xanthate, and the mass ratio of the first collector to the tin ore shaking table ore is 250-300 g / t. The first foaming agent is pine oil, and the mass ratio of the first foaming agent to the tin ore shaking table ore is 50-60 g / t.

[0022] The desulfurization scavenging uses a scavenging agent, which includes a second collector and a second foaming agent. The second collector is butyl xanthate, and the mass ratio of the second collector to the ore in the tin ore shaking table is 100-150 g / t. The second foaming agent is pine oil, and the mass ratio of the second foaming agent to the ore in the tin ore shaking table is 20-30 g / t.

[0023] Preferably, after obtaining the flotation tailings and before carrying out the shaking table re-selection operation, the flotation tailings are further demagnetized, and the equipment used for the demagnetization includes a permanent magnet drum magnetic separator.

[0024] Preferably, the shaking table re-selection operation further includes a sweeping selection after a roughing selection.

[0025] The present invention provides a method for regrinding and reselecting tin ore from a shaking table by using porcelain balls for recycling. The method comprises the following steps: grinding tin ore from a shaking table to obtain slurry, wherein the grinding medium used in the grinding comprises porcelain balls; subjecting the slurry to desulfurization flotation to obtain sulphur concentrate and flotation tailings, wherein the desulfurization flotation comprises desulfurization roughing, desulfurization cleaning and desulfurization scavenging; and subjecting the flotation tailings to a shaking table reselection operation to obtain tin concentrate, wherein the shaking table reselection operation comprises a primary roughing operation. Compared with the prior art, the present invention has the following beneficial effects: the method provided by the present invention is for tin ore in a shaking table, and adopts a method combining porcelain ball grinding and flotation. Among them, porcelain balls have the advantages of low specific gravity and high impact compared to steel balls, which improves the fineness of the grinding product (good particle size uniformity and light over-crushing). It can not only reduce the mudification of tin ore from the source, but also improve the monomer dissociation of ore and reduce the impact of iron pollution on desulfurization, improve the grade and recovery rate of tin concentrate, ensure the efficient recycling of tin resources, and have important significance for improving the recovery rate of tin ore. At the same time, the method provided by the present invention has the advantages of low energy consumption, easy operation, low separation cost, etc., and can increase the tin recovery rate by 3 to 5 percentage points, with obvious economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention provides a flow chart of a method for improving tin recovery rate by regrinding and reselecting mineral porcelain balls in a shaking table. DETAILED DESCRIPTION

[0027] The present invention provides a method for improving the tin recovery rate by regrinding and reselecting mineral porcelain balls in a shaking table, comprising the following steps:

[0028] Grinding the tin ore in a shaking table to obtain slurry, wherein the grinding medium used in the grinding includes porcelain balls;

[0029] The slurry is subjected to desulfurization flotation to obtain sulfur concentrate and flotation tailings, wherein the desulfurization flotation includes desulfurization roughing, desulfurization cleaning and desulfurization scavenging;

[0030] The flotation tailings are subjected to a shaking table gravity separation operation to obtain tin concentrate, wherein the shaking table gravity separation operation includes a primary roughing operation.

[0031] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0032] The present invention grinds tin ore in a shaking table to obtain a slurry, and the grinding media used in the grinding process includes porcelain balls. In the present invention, the tin ore in a shaking table is preferably a mixed ore. The tin ore in a shaking table preferably includes fine mud shaker concentrate and / or coarse shaker intermediate of co-existing tin ores. The co-existing tin ores include one or more of cassiterite-magnetite skarn ore, cassiterite-sulfide skarn ore, cassiterite-sulfide ore, and cassiterite-quartz ore.

[0033] In the present application, before the grinding, the present application preferably further comprises concentrating the tin ore shake table middlings to obtain a concentrated underflow; and grinding the concentrated underflow.

[0034] In the present application, the concentrating is preferably a concentrating desliming, and the underflow obtained by the concentrating desliming is ground. The equipment used in the concentrating preferably comprises a hydrocyclone or a spiral classifier. The concentration of the concentrated underflow is preferably 70-85%. The fineness of the concentrated underflow is preferably -1mm. The concentrating preferably further obtains an overflow, which is preferably used as the grinding water.

[0035] The concentrated underflow is the feed of the equipment used in the grinding.

[0036] After obtaining the concentrated underflow, the present application grinds the concentrated underflow to obtain a slurry, and the grinding medium used in the grinding comprises porcelain balls. In the present application, the equipment used in the grinding preferably comprises a ball mill or a vertical stirring mill. The equipment used in the grinding preferably further comprises a porcelain ball regrinder.

[0037] In the present application, the grinding medium preferably comprises porcelain balls or the grinding medium preferably comprises porcelain balls and steel balls. The total filling rate of the grinding medium is preferably 15-40%, which in the embodiments can be 40%, 33% or 20%. When the grinding medium preferably further comprises steel balls, the filling rate of the steel balls in the grinding medium is preferably 3-6%, which in the embodiments can be 6% or 3%; the rest is the filling rate of the porcelain balls.

[0038] In the present application, the porcelain balls preferably comprise at least two of first-grade porcelain balls, second-grade porcelain balls, third-grade porcelain balls and fourth-grade porcelain balls. The particle size of the first-grade porcelain balls is preferably 20mm, the particle size of the second-grade porcelain balls is preferably 25mm, the particle size of the third-grade porcelain balls is preferably 30mm, and the particle size of the fourth-grade porcelain balls is preferably 35mm. In the embodiments of the present application, the porcelain balls are two of the first-grade porcelain balls, the second-grade porcelain balls, the third-grade porcelain balls and the fourth-grade porcelain balls, and the mass ratio of any two of the above-mentioned graded porcelain balls is preferably 4-5:1.

[0039] In the present application, when the grinding medium preferably further comprises steel balls, the steel balls preferably comprise any one of first-grade steel balls, second-grade steel balls, third-grade steel balls and fourth-grade steel balls. The particle size of the first-grade steel balls is preferably 20mm, the particle size of the second-grade steel balls is preferably 25mm, the particle size of the third-grade steel balls is preferably 30mm, and the particle size of the fourth-grade steel balls is preferably 35mm.

[0040] In the present application, the concentration of the grinding is preferably 60-75%, and in the present application, the concentration of the grinding refers to the mass content of the ore during the grinding. The present application improves the fineness of the grinding product by changing the grinding medium (adding porcelain balls), thereby improving the recovery rate of tin.

[0041] In the present invention, after the grinding is completed, an initial ore pulp is obtained. The present invention preferably further comprises classifying the initial ore pulp to obtain ore pulp. The equipment used for the classification preferably includes any one of a spiral classifier, a hydrocyclone, and a high-frequency fine screen. The overflow obtained from the classification is the ore pulp. The classification also produces sediment. The sediment obtained from the classification is returned to the feed of the grinding process.

[0042] In the present invention, the mass content of solid mineral particles with a fineness of -0.075 mm in the slurry is preferably 40-75%, more preferably 50-75%.

[0043] In the present invention, after obtaining the ore pulp, the ore pulp is preferably placed in a stirring barrel for stirring treatment, and then the desulfurization flotation is performed.

[0044] After obtaining the ore pulp, the present invention subjects the ore pulp to desulfurization flotation. The desulfurization flotation process includes desulfurization roughing, desulfurization concentrating, and desulfurization scavenging, producing a sulfur concentrate and flotation tailings. In the present invention, the flotation process does not require the addition of a pH adjuster. The desulfurization roughing process preferably produces a rougher concentrate and a rougher tailing. The rougher concentrate is preferably subjected to desulfurization concentrating. The rougher tailings are preferably subjected to desulfurization scavenging. The desulfurization concentrating process preferably produces a sulfur concentrate and a concentrating tailing. The desulfurization scavenging process preferably produces a scavenging concentrate and a flotation tailing. The concentrating tailings and the scavenging concentrate are preferably returned to the desulfurization roughing process.

[0045] In the present invention, the desulfurization roughing preferably uses a roughing agent. The roughing agent preferably includes an activator, a first collector, and a first frother. The activator is preferably copper sulfate. The mass ratio of the activator to the tin ore in the shaking table is preferably 300-400 g / t. The first collector is preferably butyl xanthate. The mass ratio of the first collector to the tin ore in the shaking table is preferably 250-300 g / t. The first frother is preferably pine oil. The mass ratio of the first frother to the tin ore in the shaking table is preferably 50-60 g / t.

[0046] In the present invention, the desulfurization concentration is preferably blank concentration without adding any reagent.

[0047] In the present invention, the desulfurization scavenging preferably uses a scavenging agent. The scavenging agent preferably includes a second collector and a second foaming agent. The second collector is preferably butyl xanthate. The mass ratio of the second collector to the tin ore in the shaking table is preferably 100-150 g / t. The second foaming agent is preferably pine oil. The mass ratio of the second foaming agent to the tin ore in the shaking table is preferably 20-30 g / t.

[0048] After obtaining the flotation tailings, the present invention performs a shaking table gravity separation operation on the flotation tailings to obtain tin concentrate, wherein the shaking table gravity separation operation includes a primary roughing operation. In the present invention, the equipment used in the shaking table gravity separation operation preferably includes a 6S shaking table.

[0049] After obtaining the flotation tailings, before performing the shaking table re-selection operation, the present invention preferably further comprises demagnetizing the flotation tailings. In the present invention, the equipment used for the demagnetization preferably comprises a permanent magnet drum magnetic separator.

[0050] In the present invention, the shaking table re-selection operation preferably further includes a sweeping selection after a roughing selection.

[0051] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0052] Example 1: Laboratory porcelain ball mill flotation test

[0053] The object of treatment in this embodiment is mixed middlings, which are fine mud shaker concentrate and coarse-grained shaker middlings of co-existing tin ore, and the co-existing tin ore is cassiterite-sulfide skarn ore.

[0054] In this embodiment, a hydrocyclone is used to concentrate and desludify the mixed middlings to obtain a concentrated underflow. The concentration of the concentrated underflow is 85% and the particle size is -1 mm.

[0055] The concentrated underflow obtained in this example was used as a mill feed for grinding. The laboratory mill model was XMQ240×90, the grinding time was 10 minutes, and the grinding concentration was 70%. The grinding medium used in this example had a total grinding medium filling rate of 40%, a porcelain ball filling rate of 34%, and a steel ball filling rate of 6%. The porcelain ball mass ratio was 25 mm:20 mm = 80%:20%, and the steel ball particle size was 20 mm. The mill speed was 70 rpm. Since this example was a laboratory operation, the classification step was omitted, and the slurry was directly obtained after the grinding. The mass content of solid ore particles with a particle size of -0.075 mm in the slurry obtained in this example was 71.01%.

[0056] The obtained slurry is fed into a stirring flotation machine for desulfurization flotation. The desulfurization flotation process is one roughing, one cleaning and one scavenging. In the desulfurization flotation, no pH regulator is added. The roughing concentrate is subjected to desulfurization cleaning operation. No reagent is added in the desulfurization cleaning. The sulfur content of the sulfur concentrate is 16.64%, and the recovery rate is 55.98%. The roughing tailings are subjected to desulfurization scavenging operation. The scavenging operation adds 150 g / t of butyl xanthate as collector and 30 g / t of pine oil as frother. The scavenging concentrate is returned to the desulfurization roughing operation together with the cleaning tailings. The remaining slurry in the flotation tank is the flotation tailings.

[0057] The flotation tailings are fed into a permanent magnetic drum separator for demagnetization. Since the porcelain ball grinding (although steel balls are used, the proportion of steel balls is very small, so the steel balls do not produce iron basically) has no iron pollution, almost no magnetite concentrate is produced. Then, the demagnetized tailings are fed into a 6S table for gravity separation. The gravity separation only adopts one roughing. The tin concentrate with a tin content of 24.53% and a recovery rate of 37.97% is obtained.

[0058] Comparative Example 1: Laboratory steel ball grinding and flotation test

[0059] The present comparative example is basically the same as Example 1, except that the filling rate of the grinding medium is 30%, and the grinding medium is steel ball with a particle size of 50 mm. The grinding time is adjusted to obtain a slurry with a grinding fineness comparable to that of porcelain ball grinding. The obtained slurry is fed into a stirring flotation machine for flotation. The sulfur content of the sulfur concentrate is 14.83%, and the recovery rate is 47.99%. The flotation tailings are fed into a permanent magnetic drum separator for demagnetization. The yield of the magnetite concentrate is 0.23%. Then, the demagnetized tailings are fed into a 6S table for gravity separation. The gravity separation only adopts one roughing. The tin concentrate with a tin content of 26.48% and a recovery rate of 32.86% is obtained.

[0060] Example 2: Industrial porcelain ball grinding

[0061] The object treated in the present example is mixed middlings. The mixed middlings are fine slime table concentrate and coarse table middlings of a co-occurring tin ore. The co-occurring tin ore is a cassiterite-sulfide skarn ore.

[0062] The concentration of the mixed middlings in the present example is 85%, and the particle size is -1 mm.

[0063] The mixed medium ore obtained in this embodiment is fed into a mill for grinding. The industrial mill model is MQC1200×2400mm, the total filling rate of the grinding medium is 20%, the filling rate of the porcelain balls is 17%, the filling rate of the steel balls is 3%, the mass ratio of the porcelain balls is 25mm:20mm=80%:20%, the particle size of the steel balls is 20mm, the grinding concentration is 75%, the mill speed is 31r / min, and an initial slurry is obtained. The initial slurry is overflowed from the spiral classifier and the mass content of solid ore particles with a particle size of -0.075mm in the slurry is 75%.

[0064] The slurry enters a mixing tank for uniform mixing before flotation. The flotation process consists of a roughing, a finishing, and a scavenging process. In this embodiment, no pH adjuster is required for desulfurization flotation. The slurry undergoes desulfurization roughing with the addition of 400 g / t of copper sulfate as an activator, 300 g / t of butyl xanthate as a collector, and 60 g / t of pine oil as a frother. The rougher concentrate undergoes desulfurization and concentrating. The desulfurization and concentrating process is a blank selection process without the addition of any reagents, resulting in a sulfur concentrate with a sulfur content of 19.298% and a recovery rate of 48.14%. The rougher tailings undergo desulfurization and scavenging, with 150 g / t of butyl xanthate as a collector and 30 g / t of pine oil as a frother. The concentrating tailings and the scavenging concentrate are returned to the desulfurization and roughing process together. The remaining slurry in the flotation tank is the flotation tailings. The flotation tailings are demagnetized by a wet drum magnetic separator, yielding a magnetite concentrate with a yield of 0.062%.

[0065] In this embodiment, the underflow of the magnetic separator enters the shaking table for gravity separation, and the gravity separation process includes a coarse separation and a sweep separation, to obtain a tin concentrate with a tin content of 31.965% and a recovery rate of 19.93%.

[0066] Comparative Example 2: Industrial Steel Ball Grinding

[0067] This comparative example is basically the same as Example 2, except that: the grinding medium filling rate is 20%, the grinding medium is steel balls, the steel ball particle size is 50 mm, the grinding concentration is 75%, the mill speed is 31 r / min, and an initial slurry is obtained. The initial slurry is overflowed from the spiral classifier, and the mass content of solid mineral particles with a particle size of -0.075 mm in the slurry is 75%.

[0068] After mixing in a mixing tank, the slurry enters the flotation process, which involves a roughing, a finishing, and a scavenging process. This process produces a sulfur concentrate with a sulfur content of 10.94% and a recovery rate of 40.28%. The remaining slurry in the flotation tanks is the flotation tailings. The flotation tailings are demagnetized in a wet drum magnetic separator, producing a magnetite concentrate with a yield of 0.204%. The underflow from the magnetic separator enters the shaking table gravity separation process, which involves a roughing, a scavenging process, producing a tin concentrate with a tin content of 31.013% and a recovery rate of 16.3%.

[0069] From the above examples, the application provides a method for regrinding and reseparation of middlings porcelain ball in a shaking table, the mixed middlings composed of tin ore shaking table middlings (shaking table concentrate of fine slimes, middlings of coarse shaking table) is concentrated by desliming with a hydrocyclone or a spiral classifier, the underflow of the concentration is regrinded, the regrinding product is subjected to desulfurization flotation, the tailings of the desulfurization flotation are subjected to magnetic separation to remove magnetite, and finally, tin concentrate is obtained by shaking table gravity separation. The application not only can reduce tin ore sliming from the source, but also can improve the liberation of the ore and reduce the influence of iron pollution on desulfurization, and has important significance for improving the recovery rate of tin ore. The regrinding and reseparation method has the advantages of low energy consumption, easy operation and low separation cost, and can improve the tin recovery rate by 3-5 percent, and has obvious economic benefits.

[0070] Although the above examples make a detailed description of the application, it is only a part of the embodiments of the application, but not all the embodiments, and other embodiments can be obtained according to the embodiments without creativity, and these embodiments all belong to the protection scope of the application.

Claims

1. A method for improving tin recovery rate by regrinding and reselecting ore porcelain balls in a shaking table, characterized in that: The following steps are involved: Grinding the tin ore in a shaking table to obtain slurry, wherein the grinding medium used in the grinding includes porcelain balls; The slurry is subjected to desulfurization flotation to obtain sulfur concentrate and flotation tailings, wherein the desulfurization flotation includes desulfurization roughing, desulfurization cleaning and desulfurization scavenging; The flotation tailings are subjected to a shaking table gravity separation operation to obtain tin concentrate, wherein the shaking table gravity separation operation includes a primary roughing operation.

2. The method according to claim 1, characterized in that The tin ore shaking table middlings include fine mud shaking table concentrates and / or coarse-grained shaking table middlings of co-existing tin ores; the co-existing tin ores include one or more of cassiterite-sulfide skarn ore, cassiterite-magnetite skarn ore, cassiterite-sulfide ore and cassiterite-quartz ore.

3. The method according to claim 1, characterized in that Before the grinding, the tin ore shaking table middlings are concentrated to obtain a concentrated underflow; the concentrated underflow is ground; The mass content of solids in the concentrated underflow is 70-85%; the fineness of the concentrated underflow is -1mm; and the equipment used for the concentration includes a hydrocyclone or a spiral classifier.

4. The method according to claim 1, wherein The filling rate of the grinding medium is 15-40%; The porcelain balls include at least two of the following: first-level porcelain balls, second-level porcelain balls, third-level porcelain balls and fourth-level porcelain balls. The particle size of the first-level porcelain balls is 20 mm, the particle size of the second-level porcelain balls is 25 mm, the particle size of the third-level porcelain balls is 30 mm, and the particle size of the fourth-level porcelain balls is 35 mm.

5. The method according to claim 1 or 4, characterized in that The grinding medium also includes steel balls, the filling rate of the steel balls in the grinding medium is 3-6%, the steel balls include any one of primary steel balls, secondary steel balls, tertiary steel balls and quaternary steel balls, the particle size of the primary steel balls is 20 mm, the particle size of the secondary steel balls is 25 mm, the particle size of the tertiary steel balls is 30 mm, and the particle size of the quaternary steel balls is 35 mm.

6. The method according to claim 1, characterized in that The grinding concentration is 60-75%, and the equipment used for the grinding includes a ball mill or a vertical stirred mill; After the grinding is completed, an initial ore pulp is obtained, and the initial ore pulp is further classified to obtain an ore pulp, wherein the mass content of solid ore particles with a particle size of -0.075 mm in the ore pulp is 40-75%, and the equipment used for the classification includes any one of a spiral classifier, a hydrocyclone and a high-frequency fine screen.

7. The method according to claim 1, characterized in that The desulfurization roughing obtains roughing concentrate and roughing tailings, the roughing concentrate is subjected to desulfurization roughing, the roughing tailings are subjected to desulfurization scavenging, the desulfurization roughing obtains sulfur concentrate and scavenged tailings, the desulfurization scavenging obtains scavenged concentrate and flotation tailings, and the scavenged tailings and scavenged concentrate are returned to the desulfurization roughing.

8. The method according to claim 1 or 7, characterized in that The desulfurization roughing uses a roughing agent, which includes an activator, a first collector and a first foaming agent. The activator is copper sulfate, and the mass ratio of the activator to the tin ore in the shaking table is 300-400 g / t. The first collector is butyl xanthate, and the mass ratio of the first collector to the tin ore in the shaking table is 250-300 g / t. The first foaming agent is pine oil, and the mass ratio of the first foaming agent to the tin ore in the shaking table is 50-60 g / t. The desulfurization scavenging uses a scavenging agent, which includes a second collector and a second foaming agent. The second collector is butyl xanthate, and the mass ratio of the second collector to the ore in the tin ore shaking table is 100-150 g / t. The second foaming agent is pine oil, and the mass ratio of the second foaming agent to the ore in the tin ore shaking table is 20-30 g / t.

9. The method according to claim 1, characterized in that After obtaining the flotation tailings, before carrying out the shaking table re-selection operation, the flotation tailings are demagnetized, and the equipment used for the demagnetization includes a permanent magnet drum magnetic separator.

10. The method according to claim 1, characterized in that The shaking table re-selection operation also includes a sweeping selection after a roughing selection.

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