A direct flotation process for fine particulate iron-containing cassiterite

Abstract

The present application relates to the technical field of mineral processing, and particularly discloses a direct flotation method of fine-grained tin stone containing iron. The method provided by the present application first finely grinds the fine-grained tin stone containing iron, then adds a roughing adjusting agent and a collector to perform tin roughing, and obtains tin rough concentrate and roughing tailings respectively; the tin rough concentrate is further added with an adjusting agent and a collector to perform warming treatment, and obtains a warming operation product; the obtained warming operation product is subjected to tin cleaning, and tin concentrate and cleaning tailings are obtained respectively. The method has strong adaptability to raw materials, high guarantee of concentrate indexes, good economic feasibility, and good industrialization prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mineral processing, in particular to a direct flotation method of micro-fine particle tin stone containing iron. BACKGROUND

[0002] Tin is an important non-ferrous metal resource, which is widely used in electronic, information, electrical, chemical, metallurgical, building material, machinery, food packaging and other industries. Cassiterite is the most common tin mineral and also the main ore mineral of tin. Cassiterite has a high density, and gravity separation is a traditional beneficiation process for recovering cassiterite. However, cassiterite is brittle and easy to break, and it is easy to be over-crushed in the grinding process, resulting in micro-fine particle cassiterite which is difficult to be efficiently recovered by single gravity separation process. The lower limit of effective recovery size of flotation is lower than that of gravity separation, and flotation is the most important and effective process for recovering micro-fine particle cassiterite. Cassiterite generally contains iron, and when the content of iron in cassiterite is high, the gangue minerals also generally contain high iron. Similar to cassiterite, the gangue minerals containing high iron are also generally prone to sliming. The sliming of the gangue minerals containing iron will consume a large amount of flotation collector during flotation, thereby causing poor flotation indexes. For the flotation of tin ore containing high iron, the ore is generally pre-deslimed, and then fed into the cassiterite flotation system to ensure the flotation effect. However, the pre-desliming process increases the processing flow and processing cost, and also causes the loss of micro-fine particle cassiterite, resulting in resource waste. In order to fully recover these micro-fine particle cassiterite, it is necessary to develop a full-sliming direct flotation process for micro-fine particle cassiterite containing iron.

[0003] The full-sliming direct flotation process for micro-fine particle cassiterite containing iron usually uses benzyl arsine acid as a collector. Benzyl arsine acid is an organic arsenic product, which has strong collecting ability and does not float calcium and magnesium when used as a tin collector, and can greatly improve the recovery rate of fine particle cassiterite, and has been widely used in the flotation of fine particle cassiterite. However, benzyl arsine acid is easy to combine with iron ions, and when the tin ore and gangue minerals both contain a high proportion of iron, the selectivity of benzyl arsine acid to tin will be significantly reduced, and the gangue minerals containing iron will be floated in large quantities, resulting in unqualified flotation indexes.

[0004] The present application provides a new direct flotation method for micro-fine particle cassiterite containing iron, which can provide technical support for the efficient utilization of micro-fine particle cassiterite containing iron. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a direct flotation method for micro-fine particle cassiterite containing iron according to the characteristics of the micro-fine particle cassiterite containing iron. The present application uses appropriate modifiers and collectors to improve the flotation indexes, and the tin concentrate obtained has high recovery rate and high grade.

[0006] In order to solve the above technical problems, the present application adopts the technical scheme of: a direct flotation method for micro-fine particle cassiterite containing iron, comprising the following steps:

[0007] (1) fine grinding operation: grinding the fine particle containing iron cassiterite to 70-80% of -0.038mm, to obtain a grinding product; wherein the grinding concentration is 55-65%;

[0008] 70-80% of -0.038mm means that the mass percentage content of the fine particle containing iron cassiterite mineral with particle size below 0.038mm is 70-80%;

[0009] (2) tin roughing operation: preparing the grinding product into a flotation slurry, adding a roughing modifier and a collector to the flotation slurry, and performing tin roughing to obtain a tin rough concentrate and a roughing tailing, respectively;

[0010] (3) warming treatment operation: adding a modifier and a collector to the tin rough concentrate, and then performing warming treatment to obtain a warming operation product;

[0011] (4) tin cleaning operation: performing tin cleaning on the warming operation product obtained in step (3) to obtain a tin concentrate and a cleaning tailing, respectively;

[0012] In step (2), the roughing modifier comprises a modifier A and a modifier B; the modifier A is sodium ethylenediaminetetraacetate and / or sodium pyrophosphate, and the modifier B is carboxymethyl chitosan and / or hydroxypropyl chitosan; and / or,

[0013] In step (3), the modifier comprises acidified water glass; and / or,

[0014] The collector comprises benzyl arsine acid.

[0015] As an embodiment of the present application, in step (2), the roughing modifier is a mixture of the modifier A and the modifier B.

[0016] As an embodiment of the present application, in step (3), the modifier is acidified water glass.

[0017] Preferably, the acidified water glass is prepared by mixing water glass and sulfuric acid.

[0018] Further preferably, the mass ratio of water glass to sulfuric acid is 1:(1-1.5).

[0019] As an embodiment of the present application, the collector comprises benzyl arsine acid and kerosene, wherein the mass percentage content of benzyl arsine acid is 80-100%; when the collector is a mixture of benzyl arsine acid and kerosene, benzyl arsine acid and kerosene are preferably mixed at a mass ratio of (4-5):1.

[0020] As an embodiment of the present application, in step (3), the temperature of the warming treatment is controlled to be 50-70℃, and the warming treatment time is 20-60min.

[0021] Preferably, the tin rough concentrate is prepared into a slurry with a mass percentage concentration of 25-30% before the conditioning agent and the collector are added.

[0022] As an embodiment of the present application, in step (2), the conditioning agent A is added first and then the conditioning agent B is added.

[0023] Preferably, the conditioning agent A is added in an amount of 1000-2000 g / t; and the conditioning agent B is added in an amount of 200-300 g / t.

[0024] As an embodiment of the present application, in step (3), the conditioning agent is added in an amount of 500-800 g / t.

[0025] As an embodiment of the present application, in step (2), the collector is added in an amount of 1000-1500 g / t.

[0026] As an embodiment of the present application, in step (3), the collector is added in an amount of 200-300 g / t.

[0027] As an embodiment of the present application, in step (2), the tin roughing includes at least one roughing and at least one scavenging, and the scavenging concentrate product obtained in the scavenging operation is returned to the previous operation in sequence. Preferably, the amount of the collector added in the scavenging operation is sequentially reduced to 1 / 3-1 / 2 of the amount of the collector added in the previous flotation operation.

[0028] As an embodiment of the present application, in step (4), the tin cleaning includes 1-2 cleanings and 0-1 clean scavenging, and the tailing product of the cleaning operation and the concentrate product of the clean scavenging operation are returned to the previous operation in sequence. Preferably, the second cleaning adds the conditioning agent acidified water glass, and the clean scavenging adds the collector. Further preferably, the second cleaning adds the conditioning agent acidified water glass in an amount of 100-200 g / t, and the clean scavenging adds the collector in an amount of 80-120 g / t.

[0029] The present invention addresses the current problem of poor selectivity for cassiterite in direct flotation of fine-grained iron-containing cassiterite mud using benzyl arsenic acid as a collector, which results in a large amount of iron-containing gangue minerals floating up with it, leading to substandard flotation performance. By adding an organic combination regulator to the roughing operation, the organic regulator's masking and chelating effects on iron effectively suppress the iron-containing gangue minerals, enhancing the property differences between ores, and thus improving the flotation efficiency of the cassiterite roughing operation. Subsequently, the tin rough concentrate is heated and a suitable regulator is added to further enhance the selective adsorption of the collector on the cassiterite surface, significantly improving the quality of the tin concentrate and obtaining a high-quality tin concentrate. The present method significantly improves flotation performance, resulting in a high recovery rate and high-grade tin concentrate. The present method has strong adaptability to raw materials, high assurance of concentrate performance, good economic feasibility, and promising prospects for industrialization. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention provides a process flow chart of a direct flotation method for fine-grained iron-containing cassiterite. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is described in detail below through specific embodiments.

[0032] In the following examples and comparative examples, the pharmaceutical agents used are all commercially available products. The percentages in each example are all by mass.

[0033] It should also be noted that the dosage of the agent in the present invention is based on the mass of the fine-grained iron-containing cassiterite ore. For example, the dosage or addition amount of the collector is 100 g / t, that is, 100 g of collector is added per ton of fine-grained iron-containing cassiterite ore.

[0034] Example 1

[0035] This embodiment provides a direct flotation method for fine iron-containing cassiterite. The process is as follows: Figure 1 As shown in the process flow chart, the fine-grained iron-bearing cassiterite ore comes from Honghe Prefecture, Yunnan Province. Its tin content is 0.65%, and the main gangue minerals are iron-bearing quartz and ankerite. Flotation recovery is carried out according to the following steps:

[0036] (1) Fine grinding: Under the condition of grinding concentration of 60%, the fine iron-containing cassiterite ore is ground to -0.038mm, accounting for 75%, to obtain the grinding product;

[0037] (2) Tin roughing operation: the concentration of the grinding product obtained in step (1) is adjusted to 35%, and then 1500 g / t of modifier A (modifier A is a mixture of sodium ethylenediaminetetraacetate and sodium pyrophosphate, and sodium ethylenediaminetetraacetate and sodium pyrophosphate are mixed at a mass ratio of 1:2), 250 g / t of modifier B (modifier B is a mixture of carboxymethyl chitosan and hydroxypropyl chitosan, and carboxymethyl chitosan and hydroxypropyl chitosan are mixed at a mass ratio of 4:1), and 1200 g / t of collector (the collector is a mixture of benzyl arsine acid and kerosene, and benzyl arsine acid and kerosene are mixed at a mass ratio of 5:1, and the composition of the collector in this example is the same) are sequentially added to the ore slurry, and the action time of the modifier A, the modifier B and the collector after adding the modifier A, the modifier B and the collector is 4 min, 6 min and 25 min, respectively, and then tin roughing is carried out in one roughing and two scavenging, and the amount of the collector added in the scavenging is sequentially reduced to 1 / 2 of that in the previous flotation operation, and the action time is 4 min, to obtain tin rough concentrate and roughing tailings (i.e. Figure 1 intermediate tailings 1);

[0038] (3) Warm treatment operation: the concentration of the tin rough concentrate obtained in step (2) is adjusted to 25%, and then 600 g / t of acidified water glass (the acidified water glass is prepared by mixing water glass and sulfuric acid at a mass ratio of 1:1, and the preparation method of the acidified water glass in this example is the same) and 200 g / t of collector are added to the ore slurry, and the reaction is carried out at a temperature of 60°C for 50 min to obtain a warm operation product;

[0039] (4) Tin cleaning operation: the tin cleaning of the warm operation product obtained in step (3) is carried out in two cleaning and one cleaning scavenging, 100 g / t of acidified water glass is added in the second cleaning, and the action time is 4 min, and 100 g / t of collector is added in the cleaning scavenging, and the action time is 4 min, to obtain a tin concentrate product and a cleaning tailings (i.e. Figure 1 intermediate tailings 2).

[0040] The specific separation indexes of this example are shown in the following table, and the yield of the tin concentrate obtained is 1.22%, the tin grade is 45.36%, and the tin recovery rate is 85.14%.

[0041] Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate 1.22 45.36 85.14 Tails 2 3.67 0.30 1.69 Tails 1 95.11 0.09 13.17 Feed 100.00 0.65 100.00

[0042] Example 2

[0043] This example provides a direct flotation method of fine-grained iron-containing cassiterite, and the treatment process is shown in Figure 1 the process flow chart, wherein the fine-grained iron-containing cassiterite ore is from Haifeng County, Guangdong Province, the tin content thereof is 0.49%, and the main gangue minerals are iron garnet and biotite. The flotation recovery is carried out according to the following steps:

[0044] (1) fine grinding operation: under the condition of grinding concentration of 55%, the fine particle containing iron cassiterite raw ore is ground to 70% of -0.038 mm, to obtain a grinding product;

[0045] (2) tin roughing operation: the concentration of the grinding product obtained in step (1) is adjusted to 32%, and then 1800 g / t of modifier A (modifier A is a mixture of sodium ethylenediaminetetraacetate and sodium pyrophosphate, and sodium ethylenediaminetetraacetate and sodium pyrophosphate are mixed in a mass ratio of 2:1), 300 g / t of modifier B (modifier B is a mixture of carboxymethyl chitosan and hydroxypropyl chitosan, mixed in a mass ratio of 1:1), and 1000 g / t of collector (collector is a mixture of benzyl arsine acid and kerosene, and benzyl arsine acid and kerosene are mixed in a mass ratio of 4:1, and the composition of the collector in this embodiment is the same) are added in turn, and the action time is 3 min, 5 min and 30 min respectively, and then tin roughing is carried out with one roughing and one scavenging, and the addition amount of the collector for scavenging is reduced to 1 / 3 of the previous flotation operation in turn, and the action time is 6 min, and the concentrate product of the scavenging operation is returned to the previous operation in turn, to obtain tin rough concentrate and roughing tailings (i.e. Figure 1 middle tailings 1);

[0046] (3) warming treatment operation: the concentration of the tin rough concentrate obtained in step (2) is adjusted to 28%, and then 800 g / t of acidified water glass (acidified water glass is prepared by mixing water glass and sulfuric acid in a mass ratio of 1:1.5, and the preparation method of the acidified water glass in this embodiment is the same) and 300 g / t of collector are added to the slurry, and the reaction is carried out at a temperature of 70°C for 30 min, to obtain a warming operation product;

[0047] (4) tin cleaning operation: two-stage tin cleaning is carried out on the warming operation product obtained in step (3), 150 g / t of acidified water glass is added in the second stage of cleaning, and the action time is 3 min, 100 g / t of collector is added in the cleaning and scavenging, and the action time is 6 min, and the tailings product of the second stage of cleaning is returned to the previous cleaning operation, to obtain tin concentrate product and cleaning tailings (i.e. Figure 1 middle tailings 2).

[0048] The specific separation indexes of this embodiment are shown in the following table, and the yield of the obtained tin concentrate is 1.02%, the tin grade is 42.19%, and the tin recovery rate is 87.82%.

[0049] Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate 1.02 42.19 87.82 Tails 2 3.00 0.39 2.39 Tails 1 95.98 0.05 9.79 Feed 100.00 0.49 100.00

[0050] Example 3

[0051] This embodiment provides a direct flotation method for fine particle containing iron cassiterite, and the treatment process is as follows: Figure 1The process flow chart is shown below, in which the fine particle containing iron cassiterite ore is from Nandan County, Guangxi, with tin content of 1.29%, and the main gangue minerals are black siliceous rock and iron dolomite. The flotation recovery is carried out according to the following steps:

[0052] (1) Fine grinding operation: under the condition of grinding concentration of 65%, the fine particle containing iron cassiterite ore is ground to-0.038 mm accounting for 80%, to obtain the grinding product;

[0053] (2) Tin roughing operation: the concentration of the grinding product obtained in step (1) is adjusted to 38%, and then 2000 g / t of sodium pyrophosphate, 200 g / t of carboxymethyl chitosan and 1500 g / t of benzyl arsine acid are sequentially added into the ore slurry, with the action time being 5, 8 and 20 min respectively, and then one roughing and three scavenging of tin roughing is carried out, the dosage of scavenging agent benzyl arsine acid is reduced to 1 / 2 of the previous stage flotation operation, and the action time is 5 min, and the concentrate product of scavenging operation is returned to the previous operation, to obtain tin rough concentrate and roughing tailings (i.e. Figure 1 the middle tailings 1);

[0054] (3) Warm treatment operation: the concentration of the tin rough concentrate obtained in step (2) is adjusted to 30%, and then 650 g / t of acidified water glass (the acidified water glass is prepared by mixing water glass and sulfuric acid in a mass ratio of 1:1.2, and the preparation method of the acidified water glass in this embodiment is the same) and 250 g / t of collector benzyl arsine acid are added into the ore slurry, and the reaction is carried out at a temperature of 50℃ for 60 min, to obtain the warm operation product;

[0055] (4) Tin cleaning operation: two-stage tin cleaning is carried out on the warm operation product obtained in step (3), 200 g / t of acidified water glass is added in the second stage of cleaning, with the action time being 4 min, 120 g / t of benzyl arsine acid is added in the cleaning and scavenging, with the action time being 5 min, and the tailings product of the second stage of cleaning is returned to the previous cleaning operation, to obtain tin concentrate and cleaning tailings (i.e. Figure 1 the middle tailings 2).

[0056] The specific separation indexes of this embodiment are shown in the table below, and the yield of the obtained tin concentrate is 2.27%, the tin grade is 52.32%, and the tin recovery rate is 92.07%.

[0057] Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate 2.27 52.32 92.07 Tails 2 4.95 0.38 1.46 Tails 1 92.78 0.09 6.47 Feed 100.00 1.29 100.00

[0058] Example 4

[0059] This embodiment provides a direct flotation method for fine particle containing iron cassiterite, and the treatment process is as follows: Figure 1The process flow chart is shown below, in which the fine particle containing iron cassiterite ore is from Tahe County, Heilongjiang Province, with tin content of 0.87%, and the main gangue minerals are quartz and biotite. The flotation recovery is carried out according to the following steps:

[0060] (1) Fine grinding operation: under the condition of grinding concentration of 63%, the fine particle containing iron cassiterite ore is ground to-0.038 mm accounting for 76%, to obtain the ground product;

[0061] (2) Tin roughing operation: the concentration of the ground product obtained in step (1) is adjusted to 35%, and then 1200 g / t of sodium ethylenediaminetetraacetate, 240 g / t of hydroxypropyl chitosan and 1400 g / t of collector (the collector is a mixture of benzyl arsine acid and kerosene, and the benzyl arsine acid and kerosene are mixed at a mass ratio of 4:1, and the composition of the collector in this example is the same) are sequentially added into the ore slurry, and the action time is 4.5 min, 7 min and 28 min, respectively, and then one roughing and two scavenging of tin roughing is carried out, and the addition amount of the collector for scavenging is reduced to 1 / 2 of the previous flotation operation, and the action time is 4.5 min, and the concentrate products of the scavenging operation are returned to the previous operation in turn, to obtain tin rough concentrate and roughing tailings (i.e. Figure 1 the first middlings);

[0062] (3) Warm treatment operation: the concentration of the tin rough concentrate obtained in step (2) is adjusted to 28%, and then 500 g / t of acidified water glass (the acidified water glass is prepared by mixing water glass and sulfuric acid at a mass ratio of 1:1, and the preparation method of the acidified water glass in this example is the same) and 240 g / t of collector are added into the ore slurry, and the reaction is carried out at a temperature of 65℃ for 40 min, to obtain the warm operation product;

[0063] (4) Tin cleaning operation: the tin flotation cleaning of one cleaning and one cleaning scavenging is carried out on the warm operation product obtained in step (3), and 80 g / t of collector is added for cleaning and scavenging, and the action time is 4.5 min, and the concentrate products of the cleaning and scavenging operation are returned to the previous operation in turn, to obtain tin concentrate and cleaning tailings (i.e. Figure 1 the second middlings).

[0064] The specific separation indexes of this example are shown in the table below, and the yield of the obtained tin concentrate is 1.56%, the tin grade is 48.86%, and the tin recovery rate is 87.61%.

[0065] Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate 1.56 48.86 87.61 Tails 2 4.45 0.31 1.59 Tails 1 93.99 0.10 10.80 Feed 100.00 0.87 100.00

[0066] Example 5

[0067] This example provides a direct flotation method for fine particle containing iron cassiterite, and the processing process is as follows: Figure 1The process flow chart is shown below, in which the fine particle containing iron cassiterite ore is from the Hezuo City of Gansu Province, and the tin content is 0.61%, and the main gangue minerals are plagioclase and biotite. The flotation recovery is carried out according to the following steps:

[0068] (1) Fine grinding operation: under the condition of grinding concentration of 62%, the fine particle containing iron cassiterite ore is ground to 72% of -0.038 mm, and a grinding product is obtained;

[0069] (2) Tin roughing operation: the grinding product obtained in step (1) is adjusted to a concentration of 33%, and then 1600 g / t of adjusting agent A (adjusting agent A is a mixture of sodium ethylenediaminetetraacetate and sodium pyrophosphate, and sodium ethylenediaminetetraacetate and sodium pyrophosphate are mixed at a mass ratio of 1:3), 280 g / t of adjusting agent B (adjusting agent B is a mixture of carboxymethyl chitosan and hydroxypropyl chitosan, and carboxymethyl chitosan and hydroxypropyl chitosan are mixed at a mass ratio of 1:6), and 1100 g / t of collector (the collector is a mixture of benzyl arsine acid and kerosene, and benzyl arsine acid and kerosene are mixed at a mass ratio of 4.5:1, and the composition of the collector in this example is the same) are sequentially added to the ore slurry, and the action time is 4 min, 5.5 min and 24 min, respectively, and then tin roughing is carried out by one roughing and two scavenging, and the addition amount of the collector for scavenging is sequentially reduced to 1 / 2 of the previous flotation operation, and the action time is 6 min, and the concentrate products of the scavenging operation are returned to the previous operation in turn, and a tin rough concentrate and a roughing tailing (i.e. Figure 1 tailing 1) are obtained;

[0070] (3) Warm treatment operation: the concentration of the tin rough concentrate obtained in step (2) is adjusted to 28%, and then 720 g / t of acidified water glass (the acidified water glass is prepared by mixing water glass and sulfuric acid at a mass ratio of 1:1.4, and the preparation method of the acidified water glass in this example is the same) and 280 g / t of collector are added to the ore slurry, and the reaction is carried out at a temperature of 58°C for 26 min, and a warm operation product is obtained;

[0071] (4) Tin cleaning operation: two-stage tin cleaning is carried out on the warm operation product obtained in step (3), 160 g / t of acidified water glass is added in the second stage of cleaning, and the action time is 4 min, 120 g / t of collector is added in the cleaning and scavenging, and the action time is 5.5 min, and the tailing product of the second stage of cleaning is returned to the previous cleaning operation, and a tin concentrate and a cleaning tailing (i.e. Figure 1 tailing 2) are obtained.

[0072] The specific separation indexes of this example are shown in the table below, and the yield of the obtained tin concentrate is 1.07%, the tin grade is 47.19%, and the tin recovery rate is 82.77%.

[0073] Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate 1.07 47.19 82.77 Tails 2 2.22 0.38 1.38 Tails 1 96.71 0.10 15.85 Feed 100.00 0.61 100.00

[0074] Comparative Example

[0075] This comparative example provides a direct flotation method of fine particle containing iron cassiterite, the treatment process is as follows Figure 1 The process flow chart is shown, the ore sample is consistent with example 1, the tin content is 0.65%, and the main gangue mineral is iron-containing quartz and iron dolomite. The flotation recovery is carried out according to the following steps:

[0076] (1) Fine grinding operation: under the condition of grinding concentration of 60%, the fine particle containing iron cassiterite ore is ground to-0.038mm accounting for 75%, and the grinding product is obtained;

[0077] (2) Tin roughing operation: the concentration of the grinding product obtained in step (1) is adjusted to 35%, 1200g / t of collector (the collector is a mixture of benzyl arsine acid and kerosene, benzyl arsine acid and kerosene are mixed in a mass ratio of 5:1, and the composition of the collector in this comparative example is the same) is added, the action time is 25min, then one roughing and two scavenging of tin roughing is carried out, the addition amount of collector is reduced to 1 / 2 of the previous flotation operation in turn, the action time is 4min, and the tin rough concentrate and roughing tailings (i.e. Figure 1 the middle tailings 1) are obtained;

[0078] (3) Heating treatment operation: the concentration of the tin rough concentrate obtained in step (2) is adjusted to 25%, then 200g / t of collector is added to the slurry, and the reaction is carried out at a temperature of 60℃ for 50min, and the heating operation product is obtained;

[0079] (4) Tin cleaning operation: the heating operation product obtained in step (3) is subjected to two cleaning and one cleaning scavenging of tin cleaning, 100g / t of collector is added during cleaning scavenging, and the action time is 4min, and the tin concentrate product and cleaning tailings (i.e. Figure 1 the middle tailings 2) are obtained.

[0080] The specific separation indexes of this comparative example are shown in the following table, the yield of the obtained tin concentrate is 3.16%, the tin grade is 4.86%, and the tin recovery rate is 23.62%. The separation indexes of this comparative example are obviously poor, and it can be seen that under the process system of the present application, the lack of modifier and only the addition of collector cannot efficiently obtain the tin concentrate product.

[0081] Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate 3.16 4.86 23.62 Tails 2 7.49 1.38 15.90 Tails 1 89.35 0.44 60.48 Feed Comparative Example Figure 1 Figure 1 Figure 1 Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate Tails 2 Tails 1 Feed Comparative Example Figure 1 Figure 1 Figure 1 Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate Tails 2 Tails 1 Feed Comparative Example Figure 1 Figure 1 Figure 1 Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate Tails 2 Tails 1 Feed Comparative Example Figure 1 Figure 1 Figure 1 Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate Tails 2 Tails 1 Feed Comparative Example Figure 1 Figure 1 Figure 1 Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate Tails 2 Tails 1 Feed Comparative Example Figure 1 Figure 1 Figure 1 Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate Tails 2 Tails 1 Feed Comparative Example Figure 1 Figure 1 Figure 1 Product Yield (%) Tin grade (%) Tin recovery (%) Tin concentrate Tails 100.00 0.65 100.00

Claims

1. A direct flotation process for fine particulate iron-containing cassiterite, characterised in that, The method comprises the steps of: (1) fine grinding: grinding fine-grained cassiterite containing iron to 70-80% of -0.038 mm to obtain a ground product; (2) tin roughing: preparing a flotation slurry from the ground product, adding a roughing regulator and a collector to the flotation slurry, and performing tin roughing to obtain a tin rough concentrate and a roughing tailing, respectively; (3) warming treatment: adding a regulator and a collector to the tin rough concentrate, and then performing warming treatment to obtain a warming treatment product; (4) tin cleaning: performing tin cleaning on the warming treatment product obtained in step (3) to obtain a tin concentrate and a cleaning tailing, respectively; wherein the roughing regulator in step (2) comprises a regulator A and a regulator B; the regulator A is sodium ethylenediaminetetraacetate and / or sodium pyrophosphate, and the regulator B is carboxymethyl chitosan and / or hydroxypropyl chitosan; and / or, the regulator in step (3) is acidified water glass; and / or, the collector comprises benzyl arsine acid and kerosene, and the mass percentage content of benzyl arsine acid is 80-100%; when the collector is a mixture of benzyl arsine acid and kerosene, benzyl arsine acid and kerosene are mixed at a mass ratio of (4-5):

1.

2. The method of claim 1, wherein, The acidified water glass is prepared by mixing water glass and sulfuric acid, and the mixed mass ratio of water glass and sulfuric acid is: water glass:sulfuric acid = 1:(1-1.5).

3. The method according to any of claims 1-2, characterized in that, In step (3), the temperature of the warming treatment is controlled to be 50-70℃, and the warming treatment time is 20-60 min.

4. The method of claim 3, wherein, In step (3), before adding the regulator and the collector to the tin rough concentrate, the tin rough concentrate is first prepared into a slurry with a mass percentage concentration of 25-30%.

5. The method of claim 1, wherein, In step (2), when the roughing regulator is added, the regulator A is first added, and then the regulator B is added.

6. The method according to claim 1, characterized in that In step (2), the addition amount of the regulator A is 1000-2000 g / t, and the addition amount of the regulator B is 200-300 g / t.

7. The method of claim 6, wherein, In step (3), the addition amount of the added regulator is 500-800 g / t.

8. The method of claim 6, wherein, In step (2), the addition amount of the collector is 1000-1500 g / t.

9. The method of claim 8, wherein, In step (3), the addition amount of the collector is 200-300 g / t.

10. The method of claim 1, wherein, In step (2), the tin roughing comprises at least one roughing and at least one scavenging, and the scavenging concentrate product obtained in the scavenging operation is returned to the previous operation in turn; and / or, in step (4), the tin cleaning comprises 1-2 cleanings and 0-1 fine scavenging, and the tailing product of the cleaning operation and the concentrate product of the fine scavenging operation are returned to the previous operation in turn.

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