Micro-fine particle cassiterite combined collecting agent and preparation method and application thereof

Abstract

The invention relates to the technical field of beneficiation reagents, in particular to a micro-fine particle cassiterite combined collecting agent and a preparation method and application thereof. The collecting agent is composed of the following raw materials of, 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 comprises the following steps: uniformly mixing the weighed raw materials, putting the uniformly mixed raw materials into a stirrer, and adding water into the stirrer according to the weight ratio of the raw materials to the water being 1: (2-3); and heating to 60-70 DEG C, and continuously stirring for 30-45 minutes until the raw materials are fully dissolved to obtain the micro-fine particle cassiterite combined collecting agent. The prepared micro-fine particle cassiterite combined collecting agent is stable and not prone to failure, the raw material composition has low influence on the environment, and the collecting agent is safe and environmentally friendly. The mode of pre-desliming and then flotation is adopted for recycling micro-fine particle cassiterite in minerals, the influence of fine silt on follow-up tin flotation is weakened, and consumption of flotation reagents by the fine silt is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing agents, and in particular to a micro-grained cassiterite combined collector and a preparation method and application thereof. Background Art

[0002] Cassiterite is the main mineral for extracting metallic tin in industry. The selection of cassiterite beneficiation process is mainly related to its physical and chemical properties. There is a big difference between the specific gravity of cassiterite and gangue minerals in most ore deposits. Gravity separation has always been the preferred method for separating cassiterite. However, tin ore has low grade, fine embedding, complex mineral composition, and cassiterite is brittle, which easily produces a large amount of fine mud tin during the grinding process. In the face of cassiterite with a particle size of -37 microns, 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-particle minerals. Flotation is a process that changes the hydrophilicity and hydrophobicity of the mineral surface through flotation reagents, so that the hydrophobic target minerals adhere to the bubbles and are enriched on the surface of the pulp, thereby achieving separation. Therefore, the core of flotation technology is flotation reagents, which determine the flotation index of minerals, and the collection performance of collectors directly affects the flotation efficiency of minerals.

[0003] The main collectors for cassiterite flotation are fatty acids, hydroxamic acids, phosphoric acids, sulfonated succinates and arsenic acids. Fatty acids and sulfonated succinamides are used in small amounts and have strong collection ability, but poor selectivity. They are sensitive to alkaline earth metals and other heavy metal ions and are not resistant to low temperatures. Arsenic acid collectors are currently banned due to their toxicity. Hydroxamic acid collectors have good selectivity, are safe and pollution-free, but are expensive and used in large amounts. They are often used in combination with other agents in industry to reduce the amount of collectors and reduce the cost of agents through synergistic effects. Phosphonic acid collectors have strong collection ability for cassiterite, weak selectivity and high cost of use. Faced with the increasingly complex situation of fine-grained cassiterite flotation, traditional cassiterite collectors can no longer achieve good flotation effects. Based on this, mineral processing researchers have improved and optimized conventional collectors, and developed new collectors or combined collectors according to the differences in ore properties of different deposits, and obtained more research results. Due to the large specific surface area of ​​fine-grained cassiterite, a large amount of reagents are usually consumed in industrial applications, resulting in unsatisfactory economic benefits. Summary of the invention

[0004] The purpose of the present invention is to provide a combined collector for fine-grained cassiterite and a preparation method and application thereof, so as to solve the problems of large amount of collector used, poor flotation effect and unsatisfactory economic benefits in the prior art when flotating fine-grained cassiterite.

[0005] The scheme of the present invention is:

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

[0007]

[0008]

[0009] As a preferred technical solution, the steps for preparing the collector are as follows:

[0010] S1. The weighed raw materials are mixed evenly, the mixed raw materials are placed in a blender, and water is added to the blender in a ratio of 1:2 to 3 by weight of the raw materials and water;

[0011] S2. Heat to 60-70°C and continue stirring for 30-45 minutes until the raw materials are fully dissolved to obtain a fine-grained cassiterite combination collector.

[0012] As a preferred technical solution, the collector is used for flotation of fine cassiterite, and the specific steps are as follows:

[0013] (1) Sieving the ore sample to obtain a -38 μm particle size ore sample with a Sn distribution rate of 70% to 95%, and fully mixing the ore sample;

[0014] (2) adding water to the mixed ore sample to prepare the slurry, and desludging the slurry;

[0015] (3) adjusting the concentration of the ore pulp after desliming to 25-30%, adding sulfuric acid to the ore pulp to adjust the ore pulp pH to 6-7, and then sequentially adding copper sulfate 200-300 g / t, butyl xanthate 100-150 g / t, butylamine black medicine 40-80 g / t, and 2# oil 15-30 g / t to the ore pulp for sulfur roughing operation to obtain sulfur rough concentrate and sulfur rough tailings;

[0016] Add 60-80 g / t of butyl xanthate, 30-50 g / t of butylamine black powder and 15-30 g / t of 2# oil to the sulfur crude tailings to carry out the first sulfur sweeping operation to obtain sulfur sweeping concentrate and sulfur sweeping tailings;

[0017] Add 60-80 g / t of butyl xanthate, 30-50 g / t of butylamine black powder and 15-30 g / t of 2# oil to the sulfur sweep tailings to carry out the second sulfur sweep operation to obtain sulfur sweep concentrate and sulfur sweep tailings, and combine the sulfur rough concentrate, sulfur sweep concentrate and sulfur sweep concentrate into the final sulfur rough concentrate;

[0018] (4) adding 200-500 g / t of sodium carbonate, 100-300 g / t of lead nitrate, 400-600 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of 2# oil to the sulfur-sweeping tailings in sequence, wherein the sodium carbonate and the fine-grained cassiterite combined collector are alkaline, and the pH value of the slurry is 7-8, and then a tin roughing operation is performed to obtain a tin rough concentrate and a tin rough tailings;

[0019] Adding 200-400 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of 2# oil to the coarse tin tailings to carry out the first tin sweeping operation to obtain tin sweeping concentrate and tin sweeping tailings;

[0020] Adding 200-400 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of 2# oil to the tin sweeping tailings for the second tin sweeping operation to obtain tin sweeping second concentrate and tin sweeping second tailings;

[0021] Pour the tin rough concentrate into the flotation tank, add water to adjust the slurry, and perform the first tin concentration operation without adding any reagents to obtain tin concentrate 1 and tin medium ore 1. Pour the tin concentrate 1 into the flotation tank, add water to adjust the slurry, and perform the second tin concentration operation without adding any reagents to obtain tin concentrate 2 and tin medium ore 2. Return the tin sweep 1 concentrate and tin medium ore 1 to the next round of sulfur sweep 2 tailings for the second round of tin rough selection. Return the tin sweep 2 concentrate to the next round of tin rough tailings for the first tin sweep selection operation of the second round. Return the tin medium ore 2 to the next round of tin rough concentrate for the first tin sweep selection operation of the second round. The tin concentrate 2 is the final tin concentrate of this round, and the tin sweep 2 tailings is the final tin tailings of this round. The above operation is repeated for 5 to 7 rounds until equilibrium is reached. The average weight and grade of the last three rounds of tin concentrate after equilibrium are taken as the final tin concentrate weight and grade, and the average weight and grade of the last three rounds of tin tailings are taken as the final tin tailings weight and grade.

[0022] As a preferred technical solution, in step S1, a 325-mesh screen is used for wet water screening to screen the ore sample.

[0023] As a preferred technical solution, the specific steps of the desliming treatment in step S2 are: put the slurry into a barrel, add water to the fixed scale line A of the barrel each time, stir it thoroughly for 1 minute, let it stand for 3 minutes, take a water pipe and extend it into the fixed scale line B in the barrel along the barrel wall, start pumping water to the scale line B, the distance from the scale line A to the scale line B is about 1 / 3 of the depth of the slurry in the barrel, add water to the scale line A again, stir it thoroughly for 1 minute, repeat the steps 3 times, and obtain the final deslimed product.

[0024] As a preferred technical solution, the pH value of the slurry when the collector is used is 7-8.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The prepared fine-grained cassiterite combined collector is stable and not easy to fail, and the raw material composition has a low impact on the environment and is safe and environmentally friendly;

[0027] (2) The optimal flotation pH of the prepared fine-grained cassiterite combined collector is in the range of 7 to 8, and the ore dressing wastewater has a weak impact on the environment;

[0028] (3) The prepared fine-grained cassiterite combined collector is used in actual ore with a tin grade of 0.9% to 1.2%. After desludging and desulfurization, a "one coarse, two sweeps, two fines" tin flotation closed-circuit test process is 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;

[0029] (4) The method of pre-de-sludge and then flotation is adopted to recover fine cassiterite in the mineral, which weakens the influence of fine mud on subsequent tin flotation and reduces the consumption of flotation reagents by fine mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a flow chart for preparing the fine-grained cassiterite combination collector.

[0031] Figure 2 The present invention is a flotation process flow chart of the fine-grained cassiterite combined collector described in the present invention. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0033] Example 1

[0034] This embodiment is an example of the fine-grained cassiterite combination collector and its preparation method described in the present invention. Its raw material components and weight proportions are: 50 parts of benzohydroxamic acid, 30 parts of octylhydroxamic acid, 5 parts of sodium oleate, 15 parts of sodium hydroxide, and the total weight of the raw materials is 100 parts.

[0035] The preparation method of the fine-grained cassiterite combination collector comprises the following steps: weighing the raw materials according to the above proportions and mixing them evenly; placing the evenly mixed raw materials into a stirrer, and adding water to the stirrer at a weight ratio of 1:3 between the raw materials and water; heating to 70°C and stirring continuously for 30 minutes until the raw materials are fully dissolved, thereby obtaining the fine-grained cassiterite combination collector.

[0036] The fine-grained cassiterite combined collector prepared in this embodiment is applied to the flotation of a mineral sample from a mining area A in Dachang, Guangxi. The mineral sample has a tin grade of 1.21%, a sulfur grade of 5.41%, and an iron grade of 10.00%. Tin is recovered from the mineral sample. The flotation process is as follows: Figure 2 As shown, the specific steps are as follows:

[0037] (1) using a 325-mesh screen to perform wet water sieving on the ore sample, obtaining a -38 micron particle size ore sample in which the tin distribution rate is 92.48%, and the ore sample is fully mixed;

[0038] (2) Add water to the mixed ore sample to prepare the slurry, and then desludge the slurry; the desludge treatment is to put the slurry into a bucket, add water to the fixed scale line A of the bucket each time, stir it thoroughly for 1 minute, let it stand for 3 minutes, take a water pipe and extend it along the wall of the bucket into the fixed scale line B in the bucket, start pumping water to the scale line B, the distance from the scale line A to the 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 it thoroughly for 1 minute, repeat the steps 3 times, and obtain the final desludged product.

[0039] (3) adjusting the concentration of the ore pulp after desliming to 30%, then adding sulfuric acid to the ore pulp to adjust the pH value of the ore pulp to 6, then sequentially adding 300 g / t of copper sulfate, 120 g / t of butyl xanthate, 60 g / t of butylamine black powder, and 20 g / t of No. 2 oil to the ore pulp for sulfur roughing operation to obtain sulfur rough concentrate and sulfur rough tailings, sequentially adding 80 g / t of butyl xanthate, 40 g / t of butylamine black powder, and 20 g / t of No. 2 oil to the sulfur rough tailings for the first sulfur scavenging operation to obtain sulfur scavenging concentrate No. 1 and sulfur scavenging tailings, sequentially adding 80 g / t of butyl xanthate, 40 g / t of butylamine black powder, and 20 g / t of No. 2 oil to the sulfur scavenging tailings for the second sulfur scavenging operation to obtain sulfur scavenging concentrate No. 2 and sulfur scavenging tailings, and the sulfur rough concentrate, sulfur scavenging concentrate No. 1 and sulfur scavenging concentrate No. 2 are collectively referred to as final sulfur rough concentrate;

[0040] (4) 400 g / t of sodium carbonate, 200 g / t of lead nitrate, 500 g / t of the fine-grained cassiterite combined collector, 30 g / t of P86, and 20 g / t of 2# oil are sequentially added to the sulfur sweeper tailings. The sodium carbonate and the fine-grained cassiterite combined collector are alkaline, and the pH value of the slurry is 7 to 8. Then, a tin roughing operation is performed to obtain a tin rough concentrate and a tin rough tailing. 200 g / t of the fine-grained cassiterite combined collector, 30 g / t of P86, and 20 g / t of 2# oil are added to the tin rough tailings. 30g / t, 2# oil 20g / t for the first tin scavenging operation, to obtain tin scavenging concentrate 1 and tin scavenging tailings 1, add the fine-grained cassiterite combined collector 200g / t, P8630g / t, 2# oil 20g / t to the tin scavenging tailings 1 to carry out the second tin scavenging operation, to obtain tin scavenging concentrate 2 and tin scavenging tailings 2, pour the tin coarse concentrate into the flotation tank, add water to adjust the slurry, do not add any reagents for the first tin concentration operation, to obtain tin concentrate 1 and tin medium ore 1, pour the tin concentrate 1 into the flotation tank, add water to adjust the slurry, do not add any reagents for the second tin concentration operation, to obtain tin concentrate 2 and tin medium ore 2, and return the tin scavenging concentrate 1 and tin medium ore 1 to the next In one round of sulfur sweeping tailings, a second round of tin roughing operation is carried out, and the tin sweeping two concentrate is returned to the next round of tin rough tailings for the second round of first tin sweeping operation, and the tin medium ore two is returned to the next round of tin rough concentrate for the second round of first tin concentration operation. Tin concentrate two is the final tin concentrate of this round, and tin sweeping two tailings is the final tin tailings of this round. The above operation is repeated for 6 rounds until balance is achieved. The average weight and grade of the last three rounds of tin concentrate after balance are used as the final tin concentrate weight and grade, and the average weight and grade of the last three rounds of tin tailings are used as the final tin tailings weight and grade. The final tin concentrate grade is 17.34%, and the recovery rate of tin flotation operation is 77.36%.

[0041] Example 2

[0042] This embodiment is another example of the fine-grained cassiterite combination collector and its preparation method described in the present invention. Its raw material components and weight proportions are: 60 parts of benzohydroxamic acid, 20 parts of octylhydroxamic acid, 5 parts of sodium oleate, 15 parts of sodium hydroxide, and the total weight of the raw materials is 100 parts.

[0043] The preparation method of the fine-grained cassiterite combination collector comprises the following steps: weighing the raw materials according to the above proportions and mixing them evenly; placing the evenly mixed raw materials into a stirrer, and adding water to the stirrer at a weight ratio of 1:3 between the raw materials and water; heating to 70°C and stirring continuously for 30 minutes until the raw materials are fully dissolved, thereby obtaining the fine-grained cassiterite combination collector.

[0044] The fine-grained cassiterite combined collector prepared in this embodiment is applied to the flotation of a B mining area ore sample in Dachang, Guangxi. The tin grade of the ore sample is 0.95%, the sulfur grade is 6.38%, and the iron grade is 12.20%. Tin is recovered from the ore sample. The flotation process is as follows: Figure 2 As shown, the specific steps are as follows:

[0045] (1) Using a 325-mesh screen to perform wet water sieving on the ore sample, the tin distribution rate in the -38 micron particle size ore sample is 81.67%, and the ore sample is fully mixed;

[0046] (2) Add water to the mixed ore sample to prepare the slurry, and then desludge the slurry; the desludge treatment is to put the slurry into a bucket, add water to the fixed scale line A of the bucket each time, stir it thoroughly for 1 minute, let it stand for 3 minutes, take a water pipe and extend it along the wall of the bucket into the fixed scale line B in the bucket, start pumping water to the scale line B, the distance from the scale line A to the 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 it thoroughly for 1 minute, repeat the steps 3 times, and obtain the final desludged product.

[0047] (3) adjusting the concentration of the ore pulp after desliming to 30%, then adding sulfuric acid to the ore pulp to adjust the pH value of the ore pulp to 6, then sequentially adding 300 g / t of copper sulfate, 120 g / t of butyl xanthate, 60 g / t of butylamine black powder, and 20 g / t of No. 2 oil to the ore pulp for sulfur roughing operation to obtain sulfur rough concentrate and sulfur rough tailings, sequentially adding 80 g / t of butyl xanthate, 40 g / t of butylamine black powder, and 20 g / t of No. 2 oil to the sulfur rough tailings for the first sulfur scavenging operation to obtain sulfur scavenging concentrate No. 1 and sulfur scavenging tailings, sequentially adding 80 g / t of butyl xanthate, 40 g / t of butylamine black powder, and 20 g / t of No. 2 oil to the sulfur scavenging tailings for the second sulfur scavenging operation to obtain sulfur scavenging concentrate No. 2 and sulfur scavenging tailings, and the sulfur rough concentrate, sulfur scavenging concentrate No. 1 and sulfur scavenging concentrate No. 2 are collectively referred to as sulfur rough concentrate;

[0048] (4) 500 g / t of sodium carbonate, 200 g / t of lead nitrate, 400 g / t of the fine-grained cassiterite combined collector, 30 g / t of P86, and 20 g / t of 2# oil are added to the sulfur sweep tailings in sequence. The sodium carbonate and the fine-grained cassiterite combined collector are alkaline, and the pH value of the slurry is 7 to 8. Then, tin roughing operation is performed to obtain tin rough concentrate and tin rough tailings. 200 g / t of the fine-grained cassiterite combined collector, 30 g / t of P86, and 20 g / t of 2# oil are added to the tin rough tailings. 30g / t, 2# oil 20g / t for the first tin scavenging operation, to obtain tin scavenging concentrate 1 and tin scavenging tailings 1, add the fine-grained cassiterite combined collector 200g / t, P8630g / t, 2# oil 20g / t to the tin scavenging tailings 1 to carry out the second tin scavenging operation, to obtain tin scavenging concentrate 2 and tin scavenging tailings 2, pour the tin coarse concentrate into the flotation tank, add water to adjust the slurry, do not add any reagents for the first tin concentration operation, to obtain tin concentrate 1 and tin medium ore 1, pour the tin concentrate 1 into the flotation tank, add water to adjust the slurry, do not add any reagents for the second tin concentration operation, to obtain tin concentrate 2 and tin medium ore 2, and return the tin scavenging concentrate 1 and tin medium ore 1 to the next In one round of sulfur sweeping tailings, a second round of tin roughing operation is carried out, and the tin sweeping two concentrate is returned to the next round of tin rough tailings for the second round of first tin sweeping operation, and the tin medium ore two is returned to the next round of tin rough concentrate for the second round of first tin concentration operation. Tin concentrate two is the final tin concentrate of this round, and tin sweeping two tailings is the final tin tailings of this round. The above operation is repeated for 7 rounds until balance is achieved. The average weight and grade of the last three rounds of tin concentrate after balance are used as the final tin concentrate weight and grade, and the average weight and grade of the last three rounds of tin tailings are used as the final tin tailings weight and grade. The final tin concentrate grade is 21.15%, and the recovery rate of tin flotation operation is 75.45%.

[0049] Example 3

[0050] This embodiment is another example of the fine-grained cassiterite combination collector and its preparation method described in the present invention. Its raw material components and weight proportions are: 60 parts of benzohydroxamic acid, 15 parts of octylhydroxamic acid, 10 parts of sodium oleate, 15 parts of sodium hydroxide, and the total weight of the raw materials is 100 parts.

[0051] The preparation method of the fine-grained cassiterite combination collector comprises the following steps: weighing the raw materials according to the above proportions and mixing them evenly; placing the evenly mixed raw materials into a stirrer, and adding water to the stirrer at a weight ratio of 1:3 between the raw materials and water; heating to 70°C and stirring continuously for 30 minutes until the raw materials are fully dissolved, thereby obtaining the fine-grained cassiterite combination collector.

[0052] The fine-grained cassiterite combined collector prepared in this embodiment is applied to the flotation of a C mining area ore sample in Dachang, Guangxi. The tin grade of the ore sample is 1.12%, the sulfur grade is 5.65%, and the iron grade is 11.23%. Tin is recovered from the ore sample. The flotation process is as follows: Figure 2As shown, the specific steps are as follows:

[0053] (1) Using a 325-mesh screen to perform wet water sieving on the ore sample, the tin distribution rate in the -38 micron particle size ore sample is 87.57%, and the ore sample is fully mixed;

[0054] (2) Add water to the mixed ore sample to prepare the slurry, and then desludge the slurry; the desludge treatment is to put the slurry into a bucket, add water to the fixed scale line A of the bucket each time, stir it thoroughly for 1 minute, let it stand for 3 minutes, take a water pipe and extend it along the wall of the bucket into the fixed scale line B in the bucket, start pumping water to the scale line B, the distance from the scale line A to the 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 it thoroughly for 1 minute, repeat the steps 3 times, and obtain the final desludged product.

[0055] (3) adjusting the concentration of the ore pulp after desliming to 30%, then adding sulfuric acid to the ore pulp to adjust the pH value of the ore pulp to 6, then sequentially adding 300 g / t of copper sulfate, 120 g / t of butyl xanthate, 60 g / t of butylamine black powder, and 20 g / t of No. 2 oil to the ore pulp for sulfur roughing operation to obtain sulfur rough concentrate and sulfur rough tailings, sequentially adding 80 g / t of butyl xanthate, 40 g / t of butylamine black powder, and 20 g / t of No. 2 oil to the sulfur rough tailings for the first sulfur scavenging operation to obtain sulfur scavenging concentrate No. 1 and sulfur scavenging tailings, sequentially adding 80 g / t of butyl xanthate, 40 g / t of butylamine black powder, and 20 g / t of No. 2 oil to the sulfur scavenging tailings for the second sulfur scavenging operation to obtain sulfur scavenging concentrate No. 2 and sulfur scavenging tailings, and the sulfur rough concentrate, sulfur scavenging concentrate No. 1 and sulfur scavenging concentrate No. 2 are collectively referred to as sulfur rough concentrate;

[0056] (4) 500 g / t of sodium carbonate, 250 g / t of lead nitrate, 600 g / t of the fine-grained cassiterite combined collector, 30 g / t of P86, and 20 g / t of 2# oil are added to the sulfur sweeper tailings in sequence. The sodium carbonate and the fine-grained cassiterite combined collector are alkaline, and the pH value of the slurry is 7 to 8. Then, a tin roughing operation is performed to obtain a tin rough concentrate and a tin rough tailing. 200 g / t of the fine-grained cassiterite combined collector, 30 g / t of P86, and 2# oil are added to the tin rough tailings. 30g / t, 2# oil 20g / t for the first tin scavenging operation, to obtain tin scavenging concentrate 1 and tin scavenging tailings 1, add the fine-grained cassiterite combined collector 200g / t, P8630g / t, 2# oil 20g / t to the tin scavenging tailings 1 to carry out the second tin scavenging operation, to obtain tin scavenging concentrate 2 and tin scavenging tailings 2, pour the tin coarse concentrate into the flotation tank, add water to adjust the slurry, do not add any reagents for the first tin concentration operation, to obtain tin concentrate 1 and tin medium ore 1, pour the tin concentrate 1 into the flotation tank, add water to adjust the slurry, do not add any reagents for the second tin concentration operation, to obtain tin concentrate 2 and tin medium ore 2, and return the tin scavenging concentrate 1 and tin medium ore 1 to the next In one round of sulfur sweeping tailings, a second round of tin roughing operation is carried out, and the tin sweeping two concentrate is returned to the next round of tin rough tailings for the second round of first tin sweeping operation, and the tin medium ore two is returned to the next round of tin rough concentrate for the second round of first tin concentration operation. Tin concentrate two is the final tin concentrate of this round, and tin sweeping two tailings is the final tin tailings of this round. The above operation is repeated for 5 rounds until balance is achieved. The average weight and grade of the last three rounds of tin concentrate after balance are used as the final tin concentrate weight and grade, and the average weight and grade of the last three rounds of tin tailings are used as the final tin tailings weight and grade. The final tin concentrate grade is 18.54%, and the recovery rate of tin flotation operation is 81.12%.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A fine-grained cassiterite combined collector, characterized in that: It is composed of the following raw materials in parts by weight: 40-60 parts of benzohydroxamic acid 20-30 parts of octyl hydroxamic acid Sodium oleate 5-10 parts 10-20 parts of sodium hydroxide.

2. A fine-grained cassiterite combined collector as claimed in claim 1, characterized in that: The steps of preparing the collector are as follows: S1. The weighed raw materials are mixed evenly, the mixed raw materials are placed in a blender, and water is added to the blender in a ratio of 1:2 to 3 by weight of the raw materials and water; S2. Heat to 60-70°C and continue stirring for 30-45 minutes until the raw materials are fully dissolved to obtain a fine-grained cassiterite combination collector.

3. A fine-grained cassiterite combined collector as claimed in claim 1 or 2, characterized in that: The collector is used for flotation of fine cassiterite, and the specific steps are as follows: (1) Sieving the ore sample to obtain a -38 μm particle size ore sample with a Sn distribution rate of 70% to 95%, and fully mixing the ore sample; (2) adding water to the mixed ore sample to prepare the slurry, and desludging the slurry; (3) adjusting the concentration of the ore pulp after desliming to 25-30%, adding sulfuric acid to the ore pulp to adjust the ore pulp pH to 6-7, and then sequentially adding copper sulfate 200-300 g / t, butyl xanthate 100-150 g / t, butylamine black medicine 40-80 g / t, and 2# oil 15-30 g / t to the ore pulp for 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 2# oil to the sulfur crude tailings to carry out the first sulfur sweeping operation to obtain sulfur sweeping concentrate and sulfur sweeping tailings; Add 60-80 g / t of butyl xanthate, 30-50 g / t of butylamine black powder and 15-30 g / t of 2# oil to the sulfur sweep tailings to carry out the second sulfur sweep operation to obtain sulfur sweep concentrate and sulfur sweep tailings, and combine the sulfur rough concentrate, sulfur sweep concentrate and sulfur sweep concentrate into the final sulfur rough concentrate; (4) adding 200-500 g / t of sodium carbonate, 100-300 g / t of lead nitrate, 400-600 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of 2# oil to the sulfur-sweeping tailings in sequence, wherein the sodium carbonate and the fine-grained cassiterite combined collector are alkaline, and the pH value of the slurry is 7-8, and then a tin roughing operation is performed to obtain a tin rough concentrate and a tin rough tailings; Adding 200-400 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of 2# oil to the coarse tin tailings to carry out the first tin sweeping operation to obtain tin sweeping concentrate and tin sweeping tailings; Adding 200-400 g / t of the fine-grained cassiterite combined collector, 20-40 g / t of P86, and 15-30 g / t of 2# oil to the tin sweeping tailings for the second tin sweeping operation to obtain tin sweeping second concentrate and tin sweeping second tailings; Pour the tin rough concentrate into the flotation tank, add water to adjust the slurry, and perform the first tin concentration operation without adding any reagents to obtain tin concentrate 1 and tin medium ore 1. Pour the tin concentrate 1 into the flotation tank, add water to adjust the slurry, and perform the second tin concentration operation without adding any reagents to obtain tin concentrate 2 and tin medium ore 2. Return the tin sweep 1 concentrate and tin medium ore 1 to the next round of sulfur sweep 2 tailings for the second round of tin rough selection. Return the tin sweep 2 concentrate to the next round of tin rough tailings for the first tin sweep selection operation of the second round. Return the tin medium ore 2 to the next round of tin rough concentrate for the first tin sweep selection operation of the second round. The tin concentrate 2 is the final tin concentrate of this round, and the tin sweep 2 tailings is the final tin tailings of this round. The above operation is repeated for 5 to 7 rounds until equilibrium is reached. The average weight and grade of the last three rounds of tin concentrate after equilibrium are taken as the final tin concentrate weight and grade, and the average weight and grade of the last three rounds of tin tailings are taken as the final tin tailings weight and grade.

4. A fine-grained cassiterite combined collector as claimed in claim 3, characterized in that: In the step S1, a 325-mesh screen is used to perform wet water screening to screen the ore sample.

5. A fine-grained cassiterite combined collector as claimed in claim 3, characterized in that: The specific steps of the desliming treatment in step S2 are: putting the slurry into a barrel, adding water to the fixed scale line A of the barrel each time, stirring thoroughly for 1 minute, standing for 3 minutes, taking a water pipe and extending it into the fixed scale line B in the barrel along the barrel wall, starting to pump water to the scale line B, the distance from the scale line A to the scale line B is about 1 / 3 of the depth of the slurry in the barrel, adding water again to the scale line A, stirring thoroughly for 1 minute, repeating the steps 3 times, and obtaining the final deslimed product.

6. A fine-grained cassiterite combined collector as claimed in claim 1, characterized in that: When the collector is used, the pH value of the ore pulp is 7-8.

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