A method for recovering tin from high-mud polymetallic tailings

Abstract

The present invention relates to tin recovery and discloses a method for recovering tin from high-mud polymetallic tailings. The method comprises the following steps: 1) grinding the high-mud polymetallic tailings; 2) performing impurity removal flotation; 3) obtaining a mixed solution; and 4) recovering tin, wherein the mixed solution is adjusted to a pH of 5.0 by adding aqueous ammonia. After the reaction is completed, solid-liquid separation is performed, and after filtration, a zinc-lead filtrate and a precipitate are obtained; and the precipitate is washed with hot water to obtain a tin hydroxide product. The present invention reduces the interference of impurities on tin recovery, lays an excellent foundation for tin recovery, has good environmental advantages, achieves efficient tin enrichment, and has a simple process flow and greatly improved efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of tailings recovery, and in particular to a method for recovering tin from high-mud polymetallic tailings. Background Art

[0002] A large number of minerals pose environmental problems, and a significant amount of difficult-to-treat, highly argillized, polymetallic tailings is also present. The potential economic value of these ores is inestimable. However, due to their extremely complex properties, including high oxidation rates, large amounts of mud, and characteristics such as lean, fine, and mixed ore, they have not been rationally and effectively developed and utilized. This poses a serious threat to environmental protection and safety, and to some extent increases the difficulty of environmental governance. The development and comprehensive recovery of difficult-to-treat, highly argillized polymetallic tailings resources has long attracted significant attention and dedicated efforts from industry professionals.

[0003] Cassiterite in polymetallic tailings is brittle and easily muddied. Over-crushing during the crushing and grinding process can easily occur, producing large amounts of fine-grained cassiterite that are difficult to effectively recover, resulting in a high concentration of tin in the tailings. Tailings are typically fine-grained, and grinding of the raw ore produces secondary slime, which, along with some primary slime, ultimately finds its way into the tailings. Therefore, a high mud content is a hallmark of tailings resources. Low grade, fine particle size, and high mud content are the primary factors contributing to low tailings recovery rates and high processing costs. The efficient and economical development and utilization of tailings has become a major challenge for mineral processing technology. Summary of the Invention

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

[0005] The scheme of the present invention is:

[0006] A method for recovering tin from high-mud polymetallic tailings comprises the following steps:

[0007] 1) The high-mud polymetallic tailings are ground, and the mass of the ground ore with a fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings. The tailings are sent to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. The demagnetized tailings are added with clean water, deslimed and concentrated, and slurried in a cyclone to adjust the weight concentration of the slurry to less than 35%;

[0008] 2) performing decontamination flotation, adding sulfuric acid to the sediment slurry to control the slurry pH value to 5-6, adding light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, and pine oil, and performing flotation at room temperature with an ultrasonic power of 40-50W to obtain mixed ore and decontamination tailings. The mixed ore produced by flotation is treated separately;

[0009] 3) adding clean water to the decontaminated tailings to adjust the weight concentration to 25-30%, performing ultrasonic pretreatment to remove the drug, and obtaining a mixed slurry after the drug removal; the mixed slurry is concentrated by a cyclone, and the cyclone 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 mixed solution to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed, and the zinc-lead filtrate and precipitate are obtained after filtration; the precipitate is washed with hot water to obtain a tin hydroxide product.

[0011] As a preferred technical solution, the desludging and concentration in 1) is performed through a cyclone and a dewatering bucket to form a desludging operation, the bottom flow of the cyclone is discharged into the ore pump pool, and is pumped into the filter press at a feed pressure of 1MP, and squeezed at a squeezing pressure of 2MP to obtain the cyclone sediment.

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

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

[0014] As a preferred technical solution, in the 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.

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

[0016] The invention adopts a method for recovering tin from high-mud polymetallic tailings, comprising the following steps: 1) grinding the high-mud polymetallic tailings, wherein the mass of the ore with a grinding fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings, and feeding the tailings into a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings, adding clean water to the demagnetized tailings, desludging and concentrating, and slurrying the precipitated ore in a cyclone to make the weight concentration of the precipitated ore less than 35%; 2) performing decontamination flotation, adding sulfuric acid to the precipitated slurry, controlling the pH value of the ore slurry to 5-6, adding light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, and pine oil, and super The power of the sonic wave is 40 to 50 W, and flotation is performed at room temperature to obtain a mixed ore and a decontaminated tailing, and the mixed ore produced by flotation is treated separately. 3) Clean water is added to the decontaminated tailing to adjust the weight concentration to 25 to 30%, and ultrasonic pretreatment is performed to remove the drug, and after the drug is removed, a mixed ore pulp is obtained; the mixed ore pulp is concentrated by a cyclone, and the cyclone precipitate is mixed with deionized water at a solid-liquid ratio of 1:3 kg / L to obtain a mixed liquid; 4) Tin is recovered, and ammonia water is added to the mixed liquid to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed, and a zinc-lead filtrate and a precipitate are obtained after filtration; and the precipitate is washed with hot water to obtain a tin hydroxide product.

[0017] Advantages of the present invention:

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

[0019] The ultrasonic wave used improves the flotation performance, and the cavitation effect can disperse the reagent in the tailings to form a uniform and stable emulsion, thereby reducing the amount of reagent used; the subsequent ultrasonic wave has a cleaning effect on the surface of the decontaminated tailings, which can clean the impurities and reagents on the surface of the decontaminated tailings, achieving further decontamination and de-drugation, and facilitating the subsequent improvement of the tin recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a process framework diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0022] The following examples are intended to further illustrate the present invention but do not constitute any limitation thereto. Unless otherwise specified, the materials used in the following examples were purchased from conventional chemical reagent companies and raw material suppliers.

[0023] Example 1:

[0024] 1) The high-mud polymetallic tailings are ground, and the mass of the ground ore with a fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings. The tailings are sent to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. The demagnetized tailings are added with clean water, deslimed and concentrated, and slurried in a cyclone to adjust the weight concentration of the slurry to less than 35%;

[0025] 2) performing de-impurity flotation, adding sulfuric acid to the sediment slurry to control the slurry pH value to 5, adding light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, and pine oil, and performing flotation at room temperature with an ultrasonic power of 40W to obtain a mixed ore and de-impurity tailings, and the mixed ore produced by flotation is treated separately;

[0026] 3) adding clean water to the decontaminated tailings to adjust the weight concentration to 25%, performing ultrasonic pretreatment to remove the drug, and obtaining a mixed slurry after the drug removal; the mixed slurry is concentrated by a cyclone, and the cyclone 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 mixed solution to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed, and the zinc-lead filtrate and precipitate are obtained after filtration; the precipitate is washed with hot water to obtain a tin hydroxide product.

[0028] The desludging and concentration in 1) is performed through a cyclone and a dewatering bucket to form a desludging operation. The bottom flow of the cyclone is discharged into the ore pump pool, and is pumped into the filter press at a feed pressure of 1MP. The cyclone sediment is squeezed at a squeezing pressure of 2MP.

[0029] In the step 2), light calcium carbonate is added in an amount of 50 g / t of raw ore; zinc sulfate is added in an amount of 200 g / t of raw ore; sodium sulfite is added in an amount of 200 g / t of raw ore; butyl xanthate is added in an amount of 60 g / t of raw ore; butyl ammonium black powder is added in an amount of 30 g / t of raw ore; benzothiazole mercaptan is added in an amount of 30 g / t of raw ore; and pine oil is added in an amount of 20 g / t of raw ore.

[0030] In the 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°C.

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

[0033] Example 2:

[0034] 1) The high-mud polymetallic tailings are ground, and the mass of the ground ore with a fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings. The tailings are sent to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. The demagnetized tailings are added with clean water, deslimed and concentrated, and slurried in a cyclone to adjust the weight concentration of the slurry to less than 35%;

[0035] 2) performing de-impurity flotation, adding sulfuric acid to the sediment slurry to control the slurry pH value to 6, adding light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, and pine oil, and performing flotation at room temperature with an ultrasonic power of 50W to obtain a mixed ore and de-impurity tailings, and the mixed ore produced by flotation is treated separately;

[0036] 3) adding clean water to the decontaminated tailings to adjust the weight concentration to 30%, performing ultrasonic pretreatment to remove the drug, and obtaining a mixed slurry after the drug removal; the mixed slurry is concentrated by a cyclone, and the cyclone 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 mixed solution to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed, and the zinc-lead filtrate and precipitate are obtained after filtration; the precipitate is washed with hot water to obtain a tin hydroxide product.

[0038] The desludging and concentration in 1) is performed through a cyclone and a dewatering bucket to form a desludging operation. The bottom flow of the cyclone is discharged into the ore pump pool, and is pumped into the filter press at a feed pressure of 1MP. The cyclone sediment is squeezed at a squeezing pressure of 2MP.

[0039] In the step 2), light calcium carbonate is added in an amount of 50 g / t of raw ore; zinc sulfate is added in an amount of 200 g / t of raw ore; sodium sulfite is added in an amount of 200 g / t of raw ore; butyl xanthate is added in an amount of 60 g / t of raw ore; butyl ammonium black powder is added in an amount of 30 g / t of raw ore; benzothiazole mercaptan is added in an amount of 30 g / t of raw ore; and pine oil is added in an amount of 20 g / t of raw ore.

[0040] In the 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°C.

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

[0043] Example 3:

[0044] 1) The high-mud polymetallic tailings are ground, and the mass of the ground ore with a fineness of less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings. The tailings are sent to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. The demagnetized tailings are added with clean water, deslimed and concentrated, and slurried in a cyclone to adjust the weight concentration of the slurry to less than 35%;

[0045] 2) performing de-impurity flotation, adding sulfuric acid to the sediment slurry to control the slurry pH value to 6, adding light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, and pine oil, and performing flotation at room temperature with an ultrasonic power of 45W to obtain a mixed ore and de-impurity tailings, and the mixed ore produced by flotation is treated separately;

[0046] 3) adding clean water to the decontaminated tailings to adjust the weight concentration to 25-30%, performing ultrasonic pretreatment to remove the drug, and obtaining a mixed slurry after the drug removal; the mixed slurry is concentrated by a cyclone, and the cyclone 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 mixed solution to adjust the pH value to 5.0. After the reaction is completed, solid-liquid separation is performed, and the zinc-lead filtrate and precipitate are obtained after filtration; the precipitate is washed with hot water to obtain a tin hydroxide product.

[0048] The desludging and concentration in 1) is performed through a cyclone and a dewatering bucket to form a desludging operation. The bottom flow of the cyclone is discharged into the ore pump pool, and is pumped into the filter press at a feed pressure of 1MP. The cyclone sediment is squeezed at a squeezing pressure of 2MP.

[0049] In the step 2), light calcium carbonate is added in an amount of 50 g / t of raw ore; zinc sulfate is added in an amount of 200 g / t of raw ore; sodium sulfite is added in an amount of 200 g / t of raw ore; butyl xanthate is added in an amount of 60 g / t of raw ore; butyl ammonium black powder is added in an amount of 30 g / t of raw ore; benzothiazole mercaptan is added in an amount of 30 g / t of raw ore; and pine oil is added in an amount of 20 g / t of raw ore.

[0050] In the 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°C.

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

[0053] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for recovering tin from high-mud polymetallic tailings, characterized in that: The following steps are involved: 1) The high-mud polymetallic tailings are ground. The mass of the ore with a grinding fineness of less than 0.074mm accounts for 60% of the mass of the high-mud polymetallic tailings. The tailings are sent to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings. The demagnetized tailings are added with clean water, deslimed and concentrated, and slurried in a cyclone to make the weight concentration of the slurry less than 35%; 2) performing decontamination flotation, adding sulfuric acid to the sediment slurry to control the slurry pH value to 5-6, adding light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, and pine oil, and performing flotation at room temperature with an ultrasonic power of 42-46W to obtain mixed ore and decontamination tailings. The mixed ore produced by flotation is treated separately; the amount of light calcium carbonate is 50g / t of the raw ore; the amount of zinc sulfate is 200g / t of the raw ore; and the amount of sodium sulfite is 200g / t of the raw ore; Butyl xanthate, dosage is 60g / t of raw ore; butyl ammonium xanthate, dosage is 30g / t of raw ore; benzothiazole mercaptan, dosage is 30g / t of raw ore; pine oil, dosage is 20g / t of raw ore; 3) adding clean water to the decontaminated tailings to adjust the weight concentration to 25-30%, performing ultrasonic pretreatment to remove the drug, and obtaining a mixed slurry after the drug removal; the mixed slurry is concentrated by a cyclone, and the cyclone precipitate is mixed with deionized water at a solid-liquid ratio of 1:3 kg / L to obtain a mixed liquid; the ultrasonic pretreatment time is 5-20 minutes, the ultrasonic power is 800-1200W, and the ultrasonic frequency is 30kHz-40kHz; 4) Tin recovery: Ammonia water is added to the mixed solution to adjust the pH value to 5.

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

2. The method for recovering tin from high-mud polymetallic tailings according to claim 1, wherein: The desludging and concentration in 1) is performed through a cyclone and a dewatering bucket to form a desludging operation. The bottom flow of the cyclone is discharged into the ore pump pool, and is pumped into the filter press at a feed pressure of 1MP. The cyclone sediment is squeezed at a squeezing pressure of 2MP.

3. The method for recovering tin from high-mud polymetallic tailings according to claim 1, wherein: The temperature of the hot water in step 4) is 70-80°C.

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