Combined collector for fine-grained cassiterite, and preparation method therefor and use thereof

Abstract

A combined collector for fine-grained cassiterite, composed of the following raw materials in parts by weight: 40-60 parts of benzohydroxamic acid, 20-30 parts of octyl hydroxamic acid, 5-10 parts of sodium oleate, and 10-20 parts of sodium hydroxide. The preparation process of the combined collector comprises: uniformly mixing weighed raw materials, putting the uniformly mixed raw materials into a stirrer, adding water to the stirrer at a weight ratio of the raw materials to the water of 1:2-3, and heating to 60-70°C and continuously stirring for 30-45 minutes until the raw materials are fully dissolved, to obtain the combined collector for fine-grained cassiterite. The prepared combined collector for fine-grained cassiterite is stable and not prone to failure, and the raw material composition has low impact on the environment, and is safe and environmentally friendly. For the recovery of fine-grained cassiterite in minerals, a method of pre-desliming followed by flotation is used, thereby weakening the effect of fine slime on subsequent tin flotation and reducing the consumption of a flotation reagent by fine slime.

Description

A fine-grained cassiterite composite collector, its preparation method and application Technical Field

[0001] This invention relates to the field of mineral processing reagents, and in particular to a fine-grained cassiterite composite collector, its preparation method, and its application. Background Technology

[0002] Cassiterite is currently the most important mineral for extracting metallic tin industrially. The choice of cassiterite beneficiation process is mainly related to its physicochemical properties. In most deposits, there is a significant difference in specific gravity between cassiterite and gangue minerals, making gravity separation the preferred method for separating cassiterite. However, cassiterite is low-grade, finely embedded, and has a complex mineral composition. Furthermore, cassiterite is brittle, easily generating large amounts of fine tin mud during grinding. For cassiterite with a particle size of -37 micrometers, the recovery rate of gravity separation is less than 30%. Flotation is recognized as one of the most effective methods to improve the recovery rate of fine-grained minerals. Flotation works by altering the hydrophilicity or hydrophobicity of the mineral surface with flotation reagents, causing hydrophobic target minerals to adhere to air bubbles and accumulate on the surface of the pulp, thus achieving separation. Therefore, the core of flotation technology is the flotation reagent, which determines the mineral flotation parameters, and the collecting performance of the collector directly affects the mineral flotation efficiency.

[0003] Cassiterite flotation collectors mainly include fatty acids, hydroxamic acids, phosphoric acids, sulfonated succinates, and arsenoic acids. Fatty acid and sulfonated succinate collectors are used in small quantities and have strong collecting power, but poor selectivity, are sensitive to alkaline earth metals and other heavy metal ions, and are not resistant to low temperatures. Arsenoic acid collectors are currently banned due to their toxicity. Hydroxamic acid collectors have good selectivity and are safe and pollution-free, but are expensive and used in large quantities; they are often used in combination with other reagents in industry to reduce the amount of collector used and lower reagent costs through synergistic effects. Phosphonic acid collectors have strong collecting ability for cassiterite but weak selectivity and high operating costs. Faced with increasingly complex conditions in the flotation of fine-grained cassiterite, traditional cassiterite collectors are no longer sufficient to achieve good flotation results. Mineral processing researchers have therefore improved and optimized conventional collectors and developed new collectors or combined collectors based on the differences in ore properties of different deposits, resulting in significant research achievements. Because fine-grained cassiterite has a large specific surface area, it typically consumes a large amount of reagents in industrial applications, resulting in unsatisfactory economic benefits. Summary of the Invention

[0004] The purpose of this invention is to provide a combined collector for fine-grained cassiterite, its preparation method, and its application, thereby solving the problems of large collector dosage, poor flotation effect, and unsatisfactory economic benefits in the flotation of fine-grained cassiterite in the prior art.

[0005] The solution of the present invention is:

[0006] A fine-particle cassiterite composite collector, characterized in that it is composed of the following raw materials in parts by weight:

[0007] As a preferred technical solution, the preparation steps of the collector are as follows:

[0008] S1. Mix the weighed raw materials evenly, place the evenly mixed raw materials into a mixer, and add water to the mixer at a ratio of 1:2 to 3 by weight of raw materials to water.

[0009] S2. Heat to 60-70℃ and stir continuously for 30-45 minutes until the raw materials are fully dissolved to obtain a fine-particle cassiterite composite collector.

[0010] As a preferred technical solution, the collector is used for the flotation of fine-grained cassiterite, and the specific steps are as follows:

[0011] (1) Take a sample of the mineral and sieve it to obtain a mineral sample with a Sn distribution rate of 70% to 95% and a particle size of -38 micrometers. Mix the mineral sample thoroughly.

[0012] (2) Add water to the mixed mineral sample to make a slurry, and then deslim the slurry.

[0013] (3) Adjust the concentration of the slurry after desliming to 25-30%, add sulfuric acid to adjust the pH of the slurry to 6-7, and then add copper sulfate 200-300g / t, butyl xanthate 100-150g / t, butylamine black powder 40-80g / t, and No. 2 oil 15-30g / t to carry out sulfur roughing operation to obtain sulfur rough concentrate and sulfur rough tailings;

[0014] Add 60-80 g / t of butyl xanthate, 30-50 g / t of butylamine black powder, and 15-30 g / t of No. 2 oil to the sulfur rough tailings for the first sulfur scavenging operation to obtain sulfur scavenging concentrate and sulfur scavenging tailings.

[0015] Add 60-80 g / t of butyl xanthate, 30-50 g / t of butylamine black powder, and 15-30 g / t of No. 2 oil to the tailings of sulfur scavenging one in sequence for a second sulfur scavenging operation to obtain sulfur scavenging two concentrate and sulfur scavenging two tailings. Combine the sulfur rough concentrate, sulfur scavenging one concentrate and sulfur scavenging two concentrate into the final sulfur rough concentrate.

[0016] (4) Add sodium carbonate 200-500 g / t, lead nitrate 100-300 g / t, fine cassiterite combined collector 400-600 g / t, P86 20-40 g / t, and No. 2 oil 15-30 g / t to the tailings of the sulfur sludge in sequence. Sodium carbonate and fine cassiterite combined collector are alkaline. At this time, the pH value of the slurry is 7-8. Then carry out tin roughing operation to obtain tin rough concentrate and tin rough tailings.

[0017] Add 200-400 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of No. 2 oil to the tin rough tailings for the first tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings.

[0018] Add 200-400 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of No. 2 oil to the tin scavenging tailings to carry out a second tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings.

[0019] The tin rough concentrate is poured into the flotation cell, water is added to adjust the slurry, and the first tin cleaning operation is performed without any reagents, yielding tin concentrate one and tin middlings one. Tin concentrate one is poured into the flotation cell, water is added to adjust the slurry, and the second tin cleaning operation is performed without any reagents, yielding tin concentrate two and tin middlings two. Tin concentrate one and tin middlings one are returned to the next round of sulfur scavenging tailings for the second round of tin roughing operation. Tin concentrate two is returned to the next round of tin rough tailings for the first round of tin scavenging operation. Tin middlings two is returned to the next round of tin rough concentrate for the first round of tin cleaning operation. Tin concentrate two is the final tin concentrate of this round, and tin tailings two is the final tin tailings of this round. This operation is repeated 5 to 7 times until equilibrium is reached. The average weight and grade of the tin concentrate from the last three rounds after equilibrium are taken as the final tin concentrate weight and grade, and the average weight and grade of the tin tailings from the last three rounds are taken as the final tin tailings weight and grade.

[0020] As a preferred technical solution, in step S1, a 325-mesh sieve is used to perform wet screening of the mineral sample.

[0021] As a preferred technical solution, the specific steps of the desliming treatment in step S2 are as follows: put the slurry into the bucket, add water to the fixed scale line A of the bucket each time, stir thoroughly for 1 minute, let stand for 3 minutes, take a water pipe and extend it along the bucket wall into the fixed scale line B of the bucket, start pumping water to the scale line B, the distance from scale line A to scale line B is about 1 / 3 of the depth of the slurry in the bucket, add water again to the scale line A, stir thoroughly for 1 minute, repeat the steps 3 times to obtain the final deslimed product.

[0022] As a preferred technical solution, the pH value of the slurry is 7-8 when the collector is used.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] (1) The prepared fine-particle cassiterite composite collector is stable and not easily degraded. The raw material composition has a low impact on the environment and is safe and environmentally friendly.

[0025] (2) The optimal flotation pH of the prepared fine-grained cassiterite combined collector is in the range of 7 to 8, and the mineral processing wastewater has a weak impact on the environment.

[0026] (3) The fine-grained cassiterite combined collector prepared was used in actual ore with a tin grade of 0.9% to 1.2%. After desliming and desulfurization, a closed-circuit test process of "one roughing, two scavenging, and two cleaning" was carried out to obtain a tin concentrate grade of about 17% to 21% and a tin flotation recovery rate of about 77% to 81%. The fine-grained cassiterite combined collector has strong collecting ability, good selectivity, and strong adaptability.

[0027] (4) For the recovery of fine cassiterite in minerals, a pre-desliming and re-flotation method is adopted, which weakens the influence of fine mud on subsequent tin flotation and reduces the consumption of flotation reagents by fine mud. Attached Figure Description

[0028] Figure 1 is a flowchart of the preparation process of the fine-particle cassiterite combined collector of the present invention.

[0029] Figure 2 is a flow chart of the flotation process of the fine-particle cassiterite combined collector described in this invention. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments.

[0031] Example 1

[0032] This embodiment is an example of the fine-particle cassiterite combined collector and its preparation method described in this invention. The raw material composition and weight parts are as follows: 50 parts of benzohydroxyxamic acid, 30 parts of octylhydroxyxamic acid, 5 parts of sodium oleate, 15 parts of sodium hydroxide, and the total weight of the raw materials is 100 parts.

[0033] The preparation method of the fine-particle cassiterite combined collector includes the following steps: weighing each raw material according to the above proportion and mixing them evenly; placing the evenly mixed raw material into a stirrer, adding water to the stirrer at a weight ratio of raw material to water of 1:3; heating to 70°C and stirring continuously for 30 minutes until the raw material is fully dissolved to obtain the fine-particle cassiterite combined collector.

[0034] The fine-grained cassiterite combined collector prepared in this embodiment was applied to the flotation of a mineral sample from Mine A in Dachang, Guangxi. The mineral sample contained 1.21% tin, 5.41% sulfur, and 10.00% iron. Tin was recovered from the mineral sample. The flotation process is shown in Figure 2, and the specific steps are as follows:

[0035] (1) The mineral sample was sieved using a 325-mesh sieve and the tin distribution rate in the -38 micrometer particle size mineral sample was 92.48%. The mineral sample was then thoroughly mixed.

[0036] (2) Add water to the mixed mineral sample to make a slurry, and then deslim the slurry. The desliming process involves putting the slurry into a bucket, adding water to the fixed mark A of the bucket each time, stirring thoroughly for 1 minute, letting it stand for 3 minutes, taking a water pipe and extending it along the bucket wall into the fixed mark B of the bucket, and starting to pump water to the mark B. The distance from the mark A to the mark B is about 1 / 3 of the depth of the slurry in the bucket. Add water again to the mark A, stir thoroughly for 1 minute, and repeat the steps 3 times to obtain the final deslimed product.

[0037] (3) Adjust the concentration of the slurry after desliming to 30%, then add sulfuric acid to adjust the pH of the slurry to 6, and then add copper sulfate 300g / t, butyl xanthate 120g / t, butylamine black 60g / t, and No. 2 oil 20g / t to the slurry in sequence for sulfur roughing operation to obtain sulfur rough concentrate and sulfur rough tailings. Add butyl xanthate 80g / t, butylamine black 40g / t, and No. 2 oil 20g / t to the sulfur rough tailings in sequence for the first sulfur scavenging operation to obtain sulfur scavenging concentrate 1 and sulfur scavenging tailings 1. Add butyl xanthate 80g / t, butylamine black 40g / t, and No. 2 oil 20g / t to the sulfur scavenging tailings in sequence for the second sulfur scavenging operation to obtain sulfur scavenging concentrate 2 and sulfur scavenging tailings 2. The sulfur rough concentrate, sulfur scavenging concentrate 1 and sulfur scavenging concentrate 2 are collectively referred to as the final sulfur rough concentrate.

[0038] (4) Add 400g / t sodium carbonate, 200g / t lead nitrate, 500g / t of the fine-grained cassiterite combined collector, 30g / t P86, and 20g / t of No. 2 oil sequentially to the slurry tailings. Sodium carbonate and the fine-grained cassiterite combined collector are alkaline, and the pH of the slurry is 7-8 at this time. Then, perform tin roughing operation to obtain tin rough concentrate and tin rough tailings. Add 200g / t of the fine-grained cassiterite combined collector, 30g / t P86, and 20g / t of No. 2 oil to the tin rough tailings for the first tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings. Add 200g / t of the fine-grained cassiterite combined collector, 30g / t P86, and 20g / t of No. 2 oil to the tin scavenging tailings for the first tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings. Add 200g / t of the fine-grained cassiterite combined collector, 30g / t P86, and 20g / t of No. 2 oil to the tin scavenging tailings. A second tin scavenging operation is performed using 30g / t of tin scavenging oil and 20g / t of No. 2 oil, yielding tin scavenging concentrate and tin scavenging tailings. The rough tin concentrate is then poured into a flotation cell with water added to adjust the slurry. A first tin cleaning operation is performed without any reagents, yielding tin concentrate one and tin middlings one. Tin concentrate one is then poured into a flotation cell with water added to adjust the slurry. A second tin cleaning operation is performed without any reagents, yielding tin concentrate two and tin middlings two. Tin scavenging concentrate one and tin middlings one are returned to the next round of sulfur scavenging tailings for a second round of tin roughing. Tin scavenging concentrate two is returned to the next round of tin roughing. The tailings are then subjected to the first tin scavenging operation in the second round. Tin middlings ore 2 is returned to the tin rough concentrate in the next round for the first tin cleaning operation in the second round. Tin concentrate ore 2 becomes the final tin concentrate in this round, and the tailings from tin scavenging ore 2 become the final tin tailings in this round. This operation is repeated for 6 rounds until equilibrium is reached. The average weight and grade of the tin concentrate from the last three rounds after equilibrium are taken as the final tin concentrate weight and grade, and the average weight and grade of the tin tailings from the last three rounds are taken as the final tin tailings weight and grade. The final tin concentrate grade is 17.34%, and the tin flotation recovery rate is 77.36%.

[0039] Example 2

[0040] This embodiment is another example of the fine-particle cassiterite combined collector and its preparation method described in this invention. The raw material composition and weight parts are: 60 parts of benzohydroxyxamic acid, 20 parts of octylhydroxyxamic acid, 5 parts of sodium oleate, 15 parts of sodium hydroxide, and the total weight of the raw materials is 100 parts.

[0041] The preparation method of the fine-particle cassiterite combined collector includes the following steps: weighing each raw material according to the above proportion and mixing them evenly; placing the evenly mixed raw material into a stirrer, adding water to the stirrer at a weight ratio of raw material to water of 1:3; heating to 70°C and stirring continuously for 30 minutes until the raw material is fully dissolved to obtain the fine-particle cassiterite combined collector.

[0042] The fine-grained cassiterite combined collector prepared in this embodiment was applied to the flotation of a ore sample from a B mine in Dachang, Guangxi. The ore sample contained 0.95% tin, 6.38% sulfur, and 12.20% iron. Tin was recovered from the ore sample. The flotation process is shown in Figure 2, and the specific steps are as follows:

[0043] (1) The mineral sample was sieved using a 325-mesh sieve. The tin distribution rate in the -38 micrometer particle size mineral sample was 81.67%. The mineral sample was thoroughly mixed.

[0044] (2) Add water to the mixed mineral sample to make a slurry, and then deslim the slurry. The desliming process involves putting the slurry into a bucket, adding water to the fixed mark A of the bucket each time, stirring thoroughly for 1 minute, letting it stand for 3 minutes, taking a water pipe and extending it along the bucket wall into the fixed mark B of the bucket, and starting to pump water to the mark B. The distance from the mark A to the mark B is about 1 / 3 of the depth of the slurry in the bucket. Add water again to the mark A, stir thoroughly for 1 minute, and repeat the steps 3 times to obtain the final deslimed product.

[0045] (3) Adjust the concentration of the slurry after desliming to 30%, then add sulfuric acid to adjust the pH of the slurry to 6, and then add copper sulfate 300g / t, butyl xanthate 120g / t, butylamine black 60g / t, and No. 2 oil 20g / t to the slurry in sequence for sulfur roughing operation to obtain sulfur rough concentrate and sulfur rough tailings. Add butyl xanthate 80g / t, butylamine black 40g / t, and No. 2 oil 20g / t to the sulfur rough tailings in sequence for the first sulfur scavenging operation to obtain sulfur scavenging concentrate 1 and sulfur scavenging tailings 1. Add butyl xanthate 80g / t, butylamine black 40g / t, and No. 2 oil 20g / t to the sulfur scavenging tailings in sequence for the second sulfur scavenging operation to obtain sulfur scavenging concentrate 2 and sulfur scavenging tailings 2. The sulfur rough concentrate, sulfur scavenging concentrate 1 and sulfur scavenging concentrate 2 are collectively referred to as sulfur rough concentrate.

[0046] (4) Add 500g / t of sodium carbonate, 200g / t of lead nitrate, 400g / t of the fine-grained cassiterite combined collector, 30g / t of P86, and 20g / t of No. 2 oil sequentially to the slurry. Sodium carbonate and the fine-grained cassiterite combined collector are alkaline, and the pH of the slurry is 7-8. Then, perform tin roughing operation to obtain tin rough concentrate and tin rough tailings. Add 200g / t of the fine-grained cassiterite combined collector, 30g / t of P86, and 20g / t of No. 2 oil to the tin rough tailings for the first tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings. Add 200g / t of the fine-grained cassiterite combined collector, 30g / t of P86, and 20g / t of No. 2 oil to the tin scavenging tailings for the first tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings. Add 200g / t of the fine-grained cassiterite combined collector, 30g / t of P86, and 20g / t of No. 2 oil to the tin scavenging tailings. A second tin scavenging operation is performed using 30g / t of tin scavenging oil and 20g / t of No. 2 oil, yielding tin scavenging concentrate and tin scavenging tailings. The rough tin concentrate is then poured into a flotation cell with water added to adjust the slurry. A first tin cleaning operation is performed without any reagents, yielding tin concentrate one and tin middlings one. Tin concentrate one is then poured into a flotation cell with water added to adjust the slurry. A second tin cleaning operation is performed without any reagents, yielding tin concentrate two and tin middlings two. Tin scavenging concentrate one and tin middlings one are returned to the next round of sulfur scavenging tailings for a second round of tin roughing. Tin scavenging concentrate two is returned to the next round of tin roughing. The tailings are used for the second round of the first tin scavenging operation. Tin middlings ore 2 is returned to the next round of tin rough concentrate for the second round of the first tin cleaning operation. Tin concentrate ore 2 is the final tin concentrate of this round, and the tailings of tin middlings ore 2 are the final tin tailings of this round. The above operation is repeated for 7 rounds until equilibrium is reached. The average weight and grade of the tin concentrate from the last three rounds after equilibrium is taken as the final tin concentrate weight and grade, and the average weight and grade of the tin tailings from the last three rounds is taken as the final tin tailings weight and grade. The final tin concentrate grade is 21.15%, and the tin flotation recovery rate is 75.45%.

[0047] Example 3

[0048] This embodiment is another example of the fine-particle cassiterite combined collector and its preparation method described in this invention. The raw material composition and weight parts are: 60 parts of benzohydroxyxamic acid, 15 parts of octylhydroxyxamic acid, 10 parts of sodium oleate, 15 parts of sodium hydroxide, and the total weight of the raw materials is 100 parts.

[0049] The preparation method of the fine-particle cassiterite combined collector includes the following steps: weighing each raw material according to the above proportion and mixing them evenly; placing the evenly mixed raw material into a stirrer, adding water to the stirrer at a weight ratio of raw material to water of 1:3; heating to 70°C and stirring continuously for 30 minutes until the raw material is fully dissolved to obtain the fine-particle cassiterite combined collector.

[0050] The fine-grained cassiterite combined collector prepared in this embodiment was applied to the flotation of a mineral sample from a C mine in Dachang, Guangxi. The mineral sample contained 1.12% tin, 5.65% sulfur, and 11.23% iron. Tin was recovered from the mineral sample. The flotation process is shown in Figure 2, and the specific steps are as follows:

[0051] (1) The mineral sample was sieved using a 325-mesh sieve. The tin distribution rate in the -38 micrometer particle size mineral sample was 87.57%. The mineral sample was thoroughly mixed.

[0052] (2) Add water to the mixed mineral sample to make a slurry, and then deslim the slurry. The desliming process involves putting the slurry into a bucket, adding water to the fixed mark A of the bucket each time, stirring thoroughly for 1 minute, letting it stand for 3 minutes, taking a water pipe and extending it along the bucket wall into the fixed mark B of the bucket, and starting to pump water to the mark B. The distance from the mark A to the mark B is about 1 / 3 of the depth of the slurry in the bucket. Add water again to the mark A, stir thoroughly for 1 minute, and repeat the steps 3 times to obtain the final deslimed product.

[0053] (3) Adjust the concentration of the slurry after desliming to 30%, then add sulfuric acid to adjust the pH of the slurry to 6, and then add copper sulfate 300g / t, butyl xanthate 120g / t, butylamine black 60g / t, and No. 2 oil 20g / t to the slurry in sequence for sulfur roughing operation to obtain sulfur rough concentrate and sulfur rough tailings. Add butyl xanthate 80g / t, butylamine black 40g / t, and No. 2 oil 20g / t to the sulfur rough tailings in sequence for the first sulfur scavenging operation to obtain sulfur scavenging concentrate 1 and sulfur scavenging tailings 1. Add butyl xanthate 80g / t, butylamine black 40g / t, and No. 2 oil 20g / t to the sulfur scavenging tailings in sequence for the second sulfur scavenging operation to obtain sulfur scavenging concentrate 2 and sulfur scavenging tailings 2. The sulfur rough concentrate, sulfur scavenging concentrate 1 and sulfur scavenging concentrate 2 are collectively referred to as sulfur rough concentrate.

[0054] (4) Add 500g / t of sodium carbonate, 250g / t of lead nitrate, 600g / t of the fine-grained cassiterite combined collector, 30g / t of P86, and 20g / t of No. 2 oil sequentially to the slurry. Sodium carbonate and the fine-grained cassiterite combined collector are alkaline, and the pH of the slurry is 7-8. Then, perform tin roughing operation to obtain tin rough concentrate and tin rough tailings. Add 200g / t of the fine-grained cassiterite combined collector, 30g / t of P86, and 20g / t of No. 2 oil to the tin rough tailings for the first tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings. Add 200g / t of the fine-grained cassiterite combined collector, 30g / t of P86, and 20g / t of No. 2 oil to the tin scavenging tailings for the first tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings. Add 200g / t of the fine-grained cassiterite combined collector, 30g / t of P86, and 20g / t of No. 2 oil to the tin scavenging tailings. A second tin scavenging operation is performed using 30g / t of tin scavenging oil and 20g / t of No. 2 oil, yielding tin scavenging concentrate and tin scavenging tailings. The rough tin concentrate is then poured into a flotation cell with water added to adjust the slurry. A first tin cleaning operation is performed without any reagents, yielding tin concentrate one and tin middlings one. Tin concentrate one is then poured into a flotation cell with water added to adjust the slurry. A second tin cleaning operation is performed without any reagents, yielding tin concentrate two and tin middlings two. Tin scavenging concentrate one and tin middlings one are returned to the next round of sulfur scavenging tailings for a second round of tin roughing. Tin scavenging concentrate two is returned to the next round of tin roughing. The tailings are used for the second round of the first tin scavenging operation. Tin middlings ore 2 is returned to the next round of tin rough concentrate for the second round of the first tin cleaning operation. Tin concentrate ore 2 is the final tin concentrate of this round, and the tailings of tin middlings ore 2 are the final tin tailings of this round. The above operation is repeated for 5 rounds until equilibrium is reached. The average weight and grade of the tin concentrate from the last three rounds after equilibrium are used as the final tin concentrate weight and grade, and the average weight and grade of the tin tailings from the last three rounds are used as the final tin tailings weight and grade. The final tin concentrate grade is 18.54%, and the tin flotation recovery rate is 81.12%.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A fine-grained cassiterite combined collector characterized by: consists of the following raw materials in parts by weight:

2. A fine particulate cassiterite combined collector as claimed in claim 1, characterized by: The preparation steps of the collector are as follows: S1. Mix the weighed raw materials evenly, place the evenly mixed raw materials into a mixer, and add water to the mixer at a ratio of 1:2 to 3 by weight of raw materials to water. S2. Heat to 60-70℃ and stir continuously for 30-45 minutes until the raw materials are fully dissolved to obtain a fine-particle cassiterite composite collector.

3. A fine particulate cassiterite combined collector as claimed in claim 1 or 2, characterized in that: The collector is used for the flotation of fine-grained cassiterite, and the specific steps are as follows: (1) Take a sample of the mineral and sieve it to obtain a mineral sample with a Sn distribution rate of 70% to 95% and a particle size of -38 micrometers. Mix the mineral sample thoroughly. (2) Add water to the mixed mineral sample to make a slurry, and then deslim the slurry. (3) Adjust the concentration of the slurry after desliming to 25-30%, add sulfuric acid to adjust the pH of the slurry to 6-7, and then add copper sulfate 200-300g / t, butyl xanthate 100-150g / t, butylamine black powder 40-80g / t, and No. 2 oil 15-30g / t to carry out sulfur roughing operation to obtain sulfur rough concentrate and sulfur rough tailings; Add 60-80 g / t of butyl xanthate, 30-50 g / t of butylamine black powder, and 15-30 g / t of No. 2 oil to the sulfur rough tailings for the first sulfur scavenging operation to obtain sulfur scavenging concentrate and sulfur scavenging tailings. Add 60-80 g / t of butyl xanthate, 30-50 g / t of butylamine black powder, and 15-30 g / t of No. 2 oil to the tailings of sulfur scavenging one in sequence for a second sulfur scavenging operation to obtain sulfur scavenging two concentrate and sulfur scavenging two tailings. Combine the sulfur rough concentrate, sulfur scavenging one concentrate and sulfur scavenging two concentrate into the final sulfur rough concentrate. (4) Add sodium carbonate 200-500 g / t, lead nitrate 100-300 g / t, fine cassiterite combined collector 400-600 g / t, P86 20-40 g / t, and No. 2 oil 15-30 g / t to the tailings of the sulfur sludge in sequence. Sodium carbonate and fine cassiterite combined collector are alkaline. At this time, the pH value of the slurry is 7-8. Then carry out tin roughing operation to obtain tin rough concentrate and tin rough tailings. Add 200-400 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of No. 2 oil to the tin rough tailings for the first tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings. Add 200-400 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of No. 2 oil to the tin scavenging tailings to carry out a second tin scavenging operation to obtain tin scavenging concentrate and tin scavenging tailings. The tin rough concentrate is poured into the flotation cell, water is added to adjust the slurry, and the first tin cleaning operation is performed without any reagents, yielding tin concentrate one and tin middlings one. Tin concentrate one is poured into the flotation cell, water is added to adjust the slurry, and the second tin cleaning operation is performed without any reagents, yielding tin concentrate two and tin middlings two. Tin concentrate one and tin middlings one are returned to the next round of sulfur scavenging tailings for the second round of tin roughing operation. Tin concentrate two is returned to the next round of tin rough tailings for the first round of tin scavenging operation. Tin middlings two is returned to the next round of tin rough concentrate for the first round of tin cleaning operation. Tin concentrate two is the final tin concentrate of this round, and tin tailings two is the final tin tailings of this round. This operation is repeated 5 to 7 times until equilibrium is reached. The average weight and grade of the tin concentrate from the last three rounds after equilibrium are taken as the final tin concentrate weight and grade, and the average weight and grade of the tin tailings from the last three rounds are taken as the final tin tailings weight and grade.

4. A fine particulate cassiterite combined collector as claimed in claim 3, wherein: In step S1, a 325-mesh sieve is used to perform wet screening of the mineral sample.

5. A fine particulate cassiterite combined collector as claimed in claim 3, wherein: The specific steps of the desliming process in step S2 are as follows: put the slurry into the bucket, add water to the fixed mark A of the bucket each time, stir thoroughly for 1 minute, let stand for 3 minutes, take a water pipe and extend it along the bucket wall into the fixed mark B of the bucket, and start pumping water to the mark B. The distance from the mark A to the mark B is about 1 / 3 of the depth of the slurry in the bucket. Add water again to the mark A, stir thoroughly for 1 minute, repeat the steps 3 times to obtain the final deslimed product.

6. A fine particulate cassiterite combined collector as claimed in claim 1, wherein: The collector is used when the slurry pH is 7-8.

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