Method for recovering tin from high-mud-content multi-metal tailings

Abstract

Provided is a method for recovering tin from high-mud-content multi-metal tailings. The method comprises the steps of: 1) grinding high-mud-content multi-metal tailings; 2) performing impurity removal and flotation; 3) obtaining a mixed solution; and 4) performing tin recovery, involving: adding ammonia water to the mixed solution to adjust the pH value to 5.0, performing solid-liquid separation after the reaction has finished, and filtering same to obtain a filtrate containing zinc and lead, and a precipitate; and washing the precipitate with hot water to obtain a tin hydroxide product. The method reduces the interference of impurities on tin recovery, laying an excellent foundation for tin recovery; has good environmental protection advantages; and achieves efficient enrichment of tin.

Description

A method for recovering tin from polymetallic tailings with high mud content Technical Field

[0001] This invention relates to the field of tailings recovery technology, and in particular to a method for recovering tin from polymetallic tailings with high mud content. Background Technology

[0002] my country is the world's largest producer and consumer of metals, and the shortage of various mineral resources has become increasingly prominent. Approximately one-third of all mineral raw materials need to be imported annually, and insufficient resource supply has become a significant factor restricting sustainable social development. However, various mineral resources in my country, especially refractory, highly muddy polymetallic tailings, have not been rationally utilized due to a lack of effective processing technologies. This has led to numerous environmental problems caused by these minerals, and a large amount of refractory, highly muddy polymetallic tailings remains. The potential economic value of these ores is incalculable, but due to their extremely complex properties—high oxidation rate, high mud content, and being poor, fine, and impure—they have not been rationally and effectively developed and utilized, posing a serious threat to environmental protection and safety, and to some extent increasing the difficulty of environmental governance. For a long time, the comprehensive recovery and utilization of refractory, highly muddy polymetallic tailings resources has received high attention from all sectors of the industry, and a great deal of effort has been devoted to it.

[0003] Cassiterite in polymetallic tailings is brittle and easily turns into mud. During crushing and grinding, it is prone to over-grinding, producing large amounts of fine-grained cassiterite that are difficult to recover effectively, resulting in tailings containing a significant amount of tin. Tailings typically have fine particle sizes. Secondary slime is produced after grinding the original ore, and this, along with some primary slime, ultimately enters the tailings. Therefore, high slime content is a major characteristic of tailings resources. Low grade, fine particle size, and high slime content are the main factors contributing to low tailings recovery rates and high processing costs. The economical and efficient development and utilization of tailings has become a major challenge in mineral processing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a method for recovering tin from polymetallic tailings with high mud content.

[0005] The solution of the present invention is:

[0006] A method for recovering tin from polymetallic tailings with high mud content includes the following steps:

[0007] 1) Grind the high-mud polymetallic tailings. The mass of the high-mud polymetallic tailings with a grinding fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings. Then, send them to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. Add water to the demagnetized tailings, deslim and concentrate them, and use a hydrocyclone to settle and adjust the slurry so that the weight concentration of the settled slurry is less than 35%.

[0008] 2) Impurity removal flotation is carried out. Sulfuric acid is added to the slurry to control the pH value of the slurry to 5-6. Light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black powder, benzothiazole mercaptan, and pine oil are added. The ultrasonic power is 40-50W, and flotation is carried out at room temperature to obtain mixed ore and impurity removal tailings. The mixed ore produced by flotation is processed separately.

[0009] 3) Add clean water to the tailings after impurity removal to adjust the concentration to 25-30% by weight, and perform ultrasonic pretreatment to remove the reagents. After removal, a mixed slurry is obtained. The mixed slurry is concentrated by a hydrocyclone, and the hydrocyclone precipitate is mixed with deionized water at a solid-liquid ratio of 1:3 kg / L to obtain a mixed liquid.

[0010] 4) Tin recovery: Ammonia water is added to the mixture to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed. After filtration, zinc-lead filtrate and precipitate are obtained. The precipitate is washed with hot water to obtain tin hydroxide product.

[0011] As a preferred technical solution, in step 1), the desliming and thickening process is carried out by a hydrocyclone and a dewatering bucket. The underflow of the hydrocyclone is discharged into the ore pump pool and pumped into the filter press under a feed pressure of 1 MPa. The filter press is then pressed under a pressing pressure of 2 MPa to obtain hydrocyclone sediment.

[0012] As a preferred technical solution, in step 2), light calcium carbonate is added at a dosage of 50 g / t of raw ore; zinc sulfate at a dosage of 200 g / t of raw ore; sodium sulfite at a dosage of 200 g / t of raw ore; butyl xanthate at a dosage of 60 g / t of raw ore; butyl ammonium black at a dosage of 30 g / t of raw ore; benzothiazole thiol at a dosage of 30 g / t of raw ore; and pine oil at a dosage of 20 g / t of raw ore.

[0013] As a preferred technical solution, the power of the ultrasonic wave in step 2) is 42-46W.

[0014] As a preferred technical solution, in step 3), the ultrasonic pretreatment time is 5 to 20 minutes, the ultrasonic frequency is 800 to 1200W, and the ultrasonic frequency is 30kHz to 40kHz.

[0015] As a preferred technical solution, the temperature of the hot water in step 4) is 70-80℃.

[0016] The method for recovering tin from high-mud polymetallic tailings includes the following steps: 1) Grinding the high-mud polymetallic tailings to a fineness of less than 0.074 mm, with 60% of the total mass of the high-mud polymetallic tailings being ground. The tailings are then fed into a magnetic separator for weak magnetic iron removal, yielding magnetic ore and demagnetized tailings. The demagnetized tailings are then treated with water for desliming and concentration, followed by hydrocyclone sedimentation to adjust the slurry concentration to below 35%; 2) Impurity removal flotation is performed. Sulfuric acid is added to the slurry to control the pH to 5-6. Light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butylammonium black powder, benzothiazole mercaptan, and pine oil are also added. The power of the sound wave is 40-50W, and the flotation is carried out at room temperature to obtain mixed ore and de-impurified tailings. The mixed ore produced by flotation is processed separately; 3) The de-impurified tailings are added to clean water and adjusted to a weight concentration of 25-30%, and then subjected to ultrasonic pretreatment to remove reagents. After de-removal, a mixed slurry is obtained; the mixed slurry is concentrated by a hydrocyclone, and the hydrocyclone precipitate is mixed with deionized water at a solid-liquid ratio of 1:3 kg / L to obtain a mixed liquid; 4) Tin recovery: the mixed liquid is added to ammonia water to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed, and after filtration, zinc-lead filtrate and precipitate are obtained; the precipitate is washed with hot water to obtain tin hydroxide product.

[0017] Advantages of this invention:

[0018] This method reduces the interference of impurities on tin recovery, laying an excellent foundation for tin recovery. It has good environmental advantages, achieves efficient enrichment of tin, and has a simple process flow with greatly improved efficiency.

[0019] The ultrasonic waves used improve flotation performance. The cavitation effect allows the reagents to be dispersed in the tailings to form a uniform and stable emulsion, thereby reducing the amount of reagents used. The subsequent ultrasonic waves also have a cleaning effect on the surface of the depurified tailings, removing impurities and reagents from the surface of the tailings, achieving further depurification and reagent removal, which facilitates the subsequent improvement of tin recovery rate. Attached Figure Description

[0020] Figure 1 is a process framework diagram of an embodiment of the present invention. Detailed Implementation

[0021] 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.

[0022] The following embodiments are only for further detailed description of the present invention, but do not constitute any limitation on the present invention; the materials used in the following embodiments, unless otherwise specified, were purchased from conventional chemical reagent companies and raw material suppliers.

[0023] Example 1:

[0024] 1) Grind the high-mud polymetallic tailings. The mass of the high-mud polymetallic tailings with a grinding fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings. Then, send them to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. Add water to the demagnetized tailings, deslim and concentrate them, and use a hydrocyclone to settle and adjust the slurry so that the weight concentration of the settled slurry is less than 35%.

[0025] 2) Impurity removal flotation is carried out. Sulfuric acid is added to the slurry to control the pH value of the slurry to 5. Light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black powder, benzothiazole mercaptan, and pine oil are added. The ultrasonic power is 40W, and flotation is carried out at room temperature to obtain mixed ore and impurity removal tailings. The mixed ore produced by flotation is processed separately.

[0026] 3) Add clean water to the tailings after impurity removal to adjust the concentration to 25% by weight, and perform ultrasonic pretreatment to remove the reagents. After removal, a mixed slurry is obtained. The mixed slurry is concentrated by a hydrocyclone, and the hydrocyclone precipitate is mixed with deionized water at a solid-liquid ratio of 1:3 kg / L to obtain a mixed liquid.

[0027] 4) Tin recovery: Ammonia water is added to the mixture to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed. After filtration, zinc-lead filtrate and precipitate are obtained. The precipitate is washed with hot water to obtain tin hydroxide product.

[0028] In step 1), the desliming and thickening process consists of a hydrocyclone and a dewatering bucket. The underflow from the hydrocyclone is discharged into the ore pump pool and pumped into the filter press at a feed pressure of 1 MPa. The filter press is then pressed at a pressing pressure of 2 MPa to obtain hydrocyclone sediment.

[0029] In step 2), the following will be added: light calcium carbonate at a dosage of 50 g / t of raw ore; zinc sulfate at a dosage of 200 g / t of raw ore; sodium sulfite at a dosage of 200 g / t of raw ore; butyl xanthate at a dosage of 60 g / t of raw ore; butyl ammonium black at a dosage of 30 g / t of raw ore; benzothiazole thiol at a dosage of 30 g / t of raw ore; and pine oil at a dosage of 20 g / t of raw ore.

[0030] In step 3), the ultrasonic pretreatment time is 10 minutes, the ultrasonic frequency is 800W, and the ultrasonic frequency is 30kHz.

[0031] The temperature of the hot water in step 4) is 70℃.

[0032] Ultimately, the tin precipitation rate was over 99%, and the final tin recovery rate was 92.5%.

[0033] Example 2:

[0034] 1) Grind the high-mud polymetallic tailings. The mass of the high-mud polymetallic tailings with a grinding fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings. Then, send them to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. Add water to the demagnetized tailings, deslim and concentrate them, and use a hydrocyclone to settle and adjust the slurry so that the weight concentration of the settled slurry is less than 35%.

[0035] 2) Impurity removal flotation is carried out. Sulfuric acid is added to the slurry to control the pH value of the slurry to 6. Light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black powder, benzothiazole mercaptan, and pine oil are added. The ultrasonic power is 50W, and flotation is carried out at room temperature to obtain mixed ore and impurity removal tailings. The mixed ore produced by flotation is processed separately.

[0036] 3) Add clean water to the tailings after impurity removal to adjust the concentration to 30% by weight, and perform ultrasonic pretreatment to remove the reagents. After removal, a mixed slurry is obtained. The mixed slurry is concentrated by a hydrocyclone, and the hydrocyclone precipitate is mixed with deionized water at a solid-liquid ratio of 1:3 kg / L to obtain a mixed liquid.

[0037] 4) Tin recovery: Ammonia water is added to the mixture to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed. After filtration, zinc-lead filtrate and precipitate are obtained. The precipitate is washed with hot water to obtain tin hydroxide product.

[0038] In step 1), the desliming and thickening process consists of a hydrocyclone and a dewatering bucket. The underflow from the hydrocyclone is discharged into the ore pump pool and pumped into the filter press at a feed pressure of 1 MPa. The filter press is then pressed at a pressing pressure of 2 MPa to obtain hydrocyclone sediment.

[0039] In step 2), the following will be added: light calcium carbonate at a dosage of 50 g / t of raw ore; zinc sulfate at a dosage of 200 g / t of raw ore; sodium sulfite at a dosage of 200 g / t of raw ore; butyl xanthate at a dosage of 60 g / t of raw ore; butyl ammonium black at a dosage of 30 g / t of raw ore; benzothiazole thiol at a dosage of 30 g / t of raw ore; and pine oil at a dosage of 20 g / t of raw ore.

[0040] In step 3), the ultrasonic pretreatment time is 20 minutes, the ultrasonic frequency is 1200W, and the ultrasonic frequency is 40kHz.

[0041] The temperature of the hot water in step 3) is 80℃.

[0042] Ultimately, the tin precipitation rate was over 99%, and the final tin recovery rate was 94.2%.

[0043] Example 3:

[0044] 1) Grind the high-mud polymetallic tailings. The mass of the high-mud polymetallic tailings with a grinding fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings. Then, send them to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. Add water to the demagnetized tailings, deslim and concentrate them, and use a hydrocyclone to settle and adjust the slurry so that the weight concentration of the settled slurry is less than 35%.

[0045] 2) Impurity removal flotation is carried out. Sulfuric acid is added to the slurry to control the pH value of the slurry to 6. Light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black powder, benzothiazole mercaptan, and pine oil are added. The ultrasonic power is 45W, and flotation is carried out at room temperature to obtain mixed ore and impurity removal tailings. The mixed ore produced by flotation is processed separately.

[0046] 3) Add clean water to the tailings after impurity removal to adjust the concentration to 25-30% by weight, and perform ultrasonic pretreatment to remove the reagents. After removal, a mixed slurry is obtained. The mixed slurry is concentrated by a hydrocyclone, and the hydrocyclone precipitate is mixed with deionized water at a solid-liquid ratio of 1:3 kg / L to obtain a mixed liquid.

[0047] 4) Tin recovery: Ammonia water is added to the mixture to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed. After filtration, zinc-lead filtrate and precipitate are obtained. The precipitate is washed with hot water to obtain tin hydroxide product.

[0048] In step 1), the desliming and thickening process consists of a hydrocyclone and a dewatering bucket. The underflow from the hydrocyclone is discharged into the ore pump pool and pumped into the filter press at a feed pressure of 1 MPa. The filter press is then pressed at a pressing pressure of 2 MPa to obtain hydrocyclone sediment.

[0049] In step 2), the following will be added: light calcium carbonate at a dosage of 50 g / t of raw ore; zinc sulfate at a dosage of 200 g / t of raw ore; sodium sulfite at a dosage of 200 g / t of raw ore; butyl xanthate at a dosage of 60 g / t of raw ore; butyl ammonium black at a dosage of 30 g / t of raw ore; benzothiazole thiol at a dosage of 30 g / t of raw ore; and pine oil at a dosage of 20 g / t of raw ore.

[0050] In step 2), the ultrasonic pretreatment time is 15 minutes, the ultrasonic frequency is 1000W, and the ultrasonic frequency is 35kHz.

[0051] The temperature of the hot water in step 3) is 75℃.

[0052] Ultimately, the tin precipitation rate was over 99%, and the final tin recovery rate was 95.6%.

[0053] 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 method for recovering tin from polymetallic tailings with high mud content, characterized in that, Includes the following steps: 1) Grind the high-mud polymetallic tailings. The mass of the high-mud polymetallic tailings with a grinding fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings. Then, send them to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. Add water to the demagnetized tailings, deslim and concentrate them, and use a hydrocyclone to settle and adjust the slurry so that the weight concentration of the settled slurry is less than 35%. 2) Impurity removal flotation is carried out. Sulfuric acid is added to the slurry to control the pH value of the slurry to 5-6. Light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black powder, benzothiazole mercaptan, and pine oil are added. The ultrasonic power is 40-50W, and flotation is carried out at room temperature to obtain mixed ore and impurity removal tailings. The mixed ore produced by flotation is processed separately. 3) Add clean water to the tailings after impurity removal to adjust the concentration to 25-30% by weight, and perform ultrasonic pretreatment to remove the reagents. After removal, a mixed slurry is obtained. The mixed slurry is concentrated by a hydrocyclone, and the hydrocyclone precipitate is mixed with deionized water at a solid-liquid ratio of 1:3 kg / L to obtain a mixed liquid. 4) Tin recovery: Ammonia water is added to the mixture to adjust the pH value to 5.

0. After the reaction is completed, solid-liquid separation is performed. After filtration, zinc-lead filtrate and precipitate are obtained. The precipitate is washed with hot water to obtain tin hydroxide product.

2. The method for recovering tin from high-mud-content polymetallic tailings as described in claim 1, characterized in that: In step 1), the desliming and thickening process consists of a hydrocyclone and a dewatering bucket. The underflow from the hydrocyclone is discharged into the ore pump pool and pumped into the filter press at a feed pressure of 1 MPa. The filter press is then pressed at a pressing pressure of 2 MPa to obtain hydrocyclone sediment.

3. The method for recovering tin from high-mud-content polymetallic tailings as described in claim 1, characterized in that: In step 2), the following will be added: light calcium carbonate at a dosage of 50 g / t of raw ore; zinc sulfate at a dosage of 200 g / t of raw ore; sodium sulfite at a dosage of 200 g / t of raw ore; butyl xanthate at a dosage of 60 g / t of raw ore; butyl ammonium black at a dosage of 30 g / t of raw ore; benzothiazole thiol at a dosage of 30 g / t of raw ore; and pine oil at a dosage of 20 g / t of raw ore.

4. The method for recovering tin from high-mud-content polymetallic tailings as described in claim 1, characterized in that: The power of the ultrasonic wave in 2) is 42-46W.

5. The method for recovering tin from high-mud-content polymetallic tailings as described in claim 1, characterized in that: In step 3), the ultrasonic pretreatment time is 5 to 20 minutes, the ultrasonic frequency is 800 to 1200W, and the ultrasonic frequency is 30 kHz to 40 kHz.

6. The method for recovering tin from high-mud-content polymetallic tailings as described in claim 1, characterized in that: In step 4), the temperature of the hot water is 70-80℃.

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