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

Abstract

The invention relates to tin recovery, and discloses a method for recovering tin in high-mud multi-metal tailings, which comprises the following steps: 1) grinding the high-mud multi-metal tailings, 2) carrying out impurity removal flotation, and 3) obtaining a mixed solution; 4) tin recovery: adding ammonia water into the mixed solution to adjust the pH value to 5.0, carrying out solid-liquid separation after the reaction is finished, and filtering to obtain a zinc-lead-containing filtrate and a precipitate; and washing the precipitate with hot water to obtain a tin hydroxide product. By means of the method, interference of impurities on tin recovery is reduced, an excellent foundation is laid for tin recovery, the good environment-friendly advantage is achieved, efficient enrichment of tin is achieved, the technological process is simple, and efficiency is greatly improved.

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] my country is the largest producer and consumer of metals. The shortage of various mineral resources has become increasingly prominent. About one-third of various mineral raw materials need to be imported each year. The shortage of resources has become an important factor restricting the sustainable development of society. However, various mineral resources in my country, especially the difficult-to-treat high-mud polymetallic tailings, have not been reasonably utilized due to the lack of effective processing technology. A large number of minerals have caused environmental problems. At the same time, there are also a large number of difficult-to-treat high-mud polymetallic tailings. The potential economic value of this part of the ore is inestimable, but due to its extremely complex ore properties, high oxidation rate, large mud content, and poor, fine, and impure characteristics, it has not been reasonably and effectively developed and utilized. At the same time, it has caused serious threats to environmental protection and safety, and to some extent, it has also increased the difficulty of environmental governance. For a long time, the development and comprehensive recycling of difficult-to-treat high-mud polymetallic tailings resources has always been highly concerned by people from all walks of life in the industry, and a lot of effort has been devoted to it.

[0003] Cassiterite in polymetallic tailings is brittle and easy to become muddy. It is easy to be over-crushed during the crushing and grinding process, resulting in a large amount of fine-grained cassiterite, which is difficult to effectively recover, resulting in a large amount of tin tailings in the tailings. Usually, the tailings have a finer particle size. After the original ore is ground, secondary ore mud will be produced. Together with some primary ore mud, these ore muds will eventually enter the tailings. Therefore, high mud content is also a major feature of tailings resources. Low grade, fine particle size, and high mud content are the main factors causing low tailings recovery rate and high processing cost. The economic and efficient development and utilization of tailings has become a major problem in 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 grinding fineness less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings taken, and sent to the magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings, and the demagnetized tailings are added with clean water, desludging and concentrating, and the cyclone sedimentation is slurried to make the sedimentation slurry weight concentration less than 35%;

[0008] 2) Carry out impurity removal flotation, add sulfuric acid to the sediment slurry, control the slurry pH value to 5-6, add light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, pine oil, the power of ultrasonic wave is 40-50W, flotation is carried out at room temperature, and mixed ore and impurity removal tailings are obtained, and 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: adding ammonia water to the mixed solution to adjust the pH value to 5.0, performing solid-liquid separation after the reaction is completed, and obtaining a zinc-lead filtrate and a precipitate after filtration; washing the precipitate 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 a filter press at a feed pressure of 1MP, and is squeezed at a squeezing pressure of 2MP to obtain a 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 30kHZ to 40kHZ.

[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 the tailings are sent to a magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings, and the demagnetized tailings are added with clean water, desludged and concentrated, and the precipitated ore is slurried in a cyclone to make the weight concentration of the precipitated ore less than 35%; 2) performing de-impurity flotation, adding sulfuric acid to the precipitated ore 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, pine oil, and super The power of the sound wave is 40-50W, 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 25-30%, and ultrasonic pretreatment is performed to remove the drug, and a mixed ore pulp is obtained after the drug is removed; 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, and solid-liquid separation is performed after the reaction is completed, and a zinc-lead filtrate and a precipitate are obtained after filtration; 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 de-impurified tailings, which can clean the impurities and reagents on the surface of the de-impurified tailings, achieving further de-impurity and de-drug removal, 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 easy to understand, the present invention is further described below in conjunction with specific embodiments.

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

[0023] Embodiment 1:

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

[0025] 2) performing de-impurity flotation, adding sulfuric acid to the sediment slurry, controlling the slurry pH value to 5, adding light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, pine oil, the ultrasonic power is 40W, flotation is performed at room temperature, and mixed ore and de-impurity tailings are obtained, 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: adding ammonia water to the mixed solution to adjust the pH value to 5.0, performing solid-liquid separation after the reaction is completed, and obtaining a zinc-lead filtrate and a precipitate after filtration; washing the precipitate with hot water to obtain a tin hydroxide product.

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

[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 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.

[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] Embodiment 2:

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

[0035] 2) performing de-impurity flotation, adding sulfuric acid to the sediment slurry, controlling the slurry pH value to 6, adding light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, pine oil, the ultrasonic power is 50W, flotation is performed at room temperature, and mixed ore and de-impurity tailings are obtained, 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: adding ammonia water to the mixed solution to adjust the pH value to 5.0, performing solid-liquid separation after the reaction is completed, and obtaining a zinc-lead filtrate and a precipitate after filtration; washing the precipitate with hot water to obtain a tin hydroxide product.

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

[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 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.

[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] Embodiment 3:

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

[0045] 2) performing de-impurity flotation, adding sulfuric acid to the sediment slurry, controlling the slurry pH value to 6, adding light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, pine oil, the ultrasonic power is 45W, flotation is performed at room temperature, and mixed ore and de-impurity tailings are obtained, 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: adding ammonia water to the mixed solution to adjust the pH value to 5.0, performing solid-liquid separation after the reaction is completed, and obtaining a zinc-lead filtrate and a precipitate after filtration; washing the precipitate with hot water to obtain a tin hydroxide product.

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

[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 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.

[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 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 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, and the mass of the grinding fineness less than 0.074 mm is 60% of the mass of the high-mud polymetallic tailings taken, and sent to the magnetic separator for weak magnetic iron removal to obtain magnetic ore and demagnetized tailings, and the demagnetized tailings are added with clean water, desludging and concentrating, and the cyclone sedimentation is slurried to make the sedimentation slurry weight concentration less than 35%; 2) Carry out impurity removal flotation, add sulfuric acid to the sediment slurry, control the slurry pH value to 5-6, add light calcium carbonate, zinc sulfate, sodium sulfite, butyl xanthate, butyl ammonium black medicine, benzothiazole mercaptan, pine oil, the power of ultrasonic wave is 40-50W, flotation is carried out at room temperature, and mixed ore and impurity removal tailings are obtained, and the mixed ore produced by flotation is treated separately; 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; 4) Tin recovery: adding ammonia water to the mixed solution to adjust the pH value to 5.0, performing solid-liquid separation after the reaction is completed, and obtaining a zinc-lead filtrate and a precipitate after filtration; washing the precipitate with hot water to obtain a tin hydroxide product.

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

3. The method for recovering tin from high-mud polymetallic tailings according to claim 1, characterized in that: 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.

4. The method for recovering tin from high-mud polymetallic tailings according to 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 polymetallic tailings according to claim 1, characterized in that: 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 30kHZ to 40kHZ.

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

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