System for preparing zinc sulfate heptahydrate from zinc-containing waste

Abstract

The utility model relates to the technical field of zinc-containing waste treatment, in particular to a system for preparing zinc sulfate heptahydrate from zinc-containing waste, which comprises a base, a primary leaching reaction kettle and a secondary leaching reaction kettle. A plate-and-frame filter press is mounted between the primary leaching reaction kettle and the secondary leaching reaction kettle through a mounting seat, an input port of the plate-and-frame filter press is respectively communicated with the primary leaching reaction kettle and the secondary leaching reaction kettle through a material conveying hose A, and a material pump is arranged on the material conveying hose A; according to the system for preparing the zinc sulfate heptahydrate from the zinc-containing waste, the zinc sulfate heptahydrate is conveniently extracted from the zinc-containing waste in a secondary leaching manner, so that the hazardous waste is reasonably treated and is processed and prepared into a widely used zinc salt product, and metal resources can be recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of zinc-containing waste treatment, in particular to a system for preparing zinc sulfate heptahydrate from zinc-containing waste. Background Art

[0002] As zinc resources become increasingly scarce, the recycling and reuse of secondary resources is becoming increasingly important. Zinc-containing wastes are hazardous wastes, which come from waste flux generated during hot-dip galvanizing, dust ash generated by dust removal devices, and sludge after zinc-containing wastewater treatment. Improper disposal will cause serious harm to the ecological environment and human health, and also cause the loss of secondary resources. Zinc sulfate heptahydrate can be used as a mordant, wood preservative, and bleaching agent in the papermaking industry. It is also used in medicine, artificial fibers, electrolysis, electroplating, pesticides, and the production of zinc salts. It is a widely used zinc salt. Recycling and preparing zinc sulfate heptahydrate from zinc-containing wastes can make the hazardous wastes reasonably disposed of.

[0003] The existing system for preparing zinc sulfate heptahydrate from zinc-containing waste cannot extract zinc sulfate heptahydrate from zinc-containing waste by secondary leaching, so as to properly dispose of hazardous waste, cannot be processed into widely used zinc salt products, and cannot realize the recycling of metal resources. Utility Model Content

[0004] In view of the problems in the prior art, the utility model provides a system for preparing zinc sulfate heptahydrate from zinc-containing waste. The system for preparing zinc sulfate heptahydrate from zinc-containing waste is convenient for extracting zinc sulfate heptahydrate from zinc-containing waste by secondary leaching, so that hazardous waste can be reasonably disposed of, and processed into widely used zinc salt products, which can realize the recycling of metal resources.

[0005] The utility model solves the technical problem by adopting a technical solution to prepare zinc sulfate heptahydrate system from zinc-containing waste, comprising a base, a primary leaching reactor and a secondary leaching reactor, wherein the primary leaching reactor and the secondary leaching reactor are respectively arranged at two ends of the top of the base, a plate-frame filter press is installed between the primary leaching reactor and the secondary leaching reactor through a mounting seat, and the input ports of the plate-frame filter press are respectively connected to the primary leaching reactor and the secondary leaching reactor through a feed hose A, and a feed pump is arranged on the feed hose A;

[0006] An MVR evaporator is installed on the top of the base and on one side of the plate and frame filter press through a mounting seat. The input port of the MVR evaporator is connected to the output port of the plate and frame filter press through a feed hose B. A feed valve is provided on the feed hose B. A discharge pipe is provided on one side of the bottom end of the primary leaching reactor and the secondary leaching reactor, and a discharge valve is provided on the discharge pipe.

[0007] By adopting the above technical scheme, the system for preparing zinc sulfate heptahydrate from zinc-containing waste is convenient for extracting zinc sulfate heptahydrate from zinc-containing waste by secondary leaching, so that hazardous waste can be reasonably disposed of and processed into widely used zinc salt products, which can realize the recycling of metal resources.

[0008] Specifically, the tops of the primary leaching reactor and the secondary leaching reactor are both provided with reactor top connection ports, and the tops of the reactor top connection ports are clamped with reactor top covers.

[0009] Specifically, an electric stirrer is installed at the middle part of the top of the reactor top cover through a mounting seat, and the stirring ends of the electric stirrer are respectively located inside the primary leaching reactor and the secondary leaching reactor.

[0010] By adopting the above technical solution, the electric stirrer is used to stir the solutions inside the primary leaching reactor and the secondary leaching reactor to increase the reaction rate.

[0011] Specifically, a feeding pipe is arranged on the top of the reactor top cover and on one side of the electric stirrer, and a feeding control valve is arranged on the feeding pipe.

[0012] By adopting the above technical solution, the feed control valve is opened to facilitate adding the raw materials into the primary leaching reactor and the secondary leaching reactor through the feed pipe.

[0013] Specifically, a discharge port is provided on one side of the bottom end of the MVR evaporator, and a discharge sealing plate is installed on one side of the discharge port by screws.

[0014] Specifically, a supporting side plate is installed on the other end of the top of the base through bolts, and a UV purification lamp is installed on the inner side of the supporting side plate through a lamp holder.

[0015] Beneficial effects of the utility model:

[0016] (1) The utility model discloses a system for preparing zinc sulfate heptahydrate from zinc-containing wastes. The system uses an MVR evaporator to heat and evaporate the impurity-removed solution to concentrate it to 220 g / L. The solution is then transferred to a crystallization reactor for crystallization. Granular zinc sulfate heptahydrate crystals are obtained by controlling the temperature and stirring speed and adding crystal seeds of a certain particle size.

[0017] (2) The utility model discloses a system for preparing zinc sulfate heptahydrate from zinc-containing waste. The system for preparing zinc sulfate heptahydrate from zinc-containing waste is convenient for extracting zinc sulfate heptahydrate from zinc-containing waste by secondary leaching, so that hazardous waste can be properly disposed of, and processed into widely used zinc salt products, thereby enabling the recycling of metal resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a bottom view of the utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the material delivery hose B and the material delivery valve of the utility model.

[0022] In the figure: 1. primary leaching reactor; 2. secondary leaching reactor; 3. feeding control valve; 4. plate and frame filter press; 5. feed hose A; 6. feed pump; 7. electric agitator; 8. feeding pipe; 9. reactor top cover; 10. reactor top connection port; 11. discharge valve; 12. discharge pipe; 13. base; 14. MVR evaporator; 15. discharge sealing plate; 16. discharge port; 17. UV purification lamp; 18. support side plate; 19. feed hose B; 20. feed valve. DETAILED DESCRIPTION

[0023] 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 implementation methods.

[0024] The system for preparing zinc sulfate heptahydrate from zinc-containing waste is convenient for extracting zinc sulfate heptahydrate from zinc-containing waste by secondary leaching, so that hazardous waste can be properly disposed of and processed into widely used zinc salt products, which can realize the recycling of metal resources. Figure 1-3 As shown, a system for preparing zinc sulfate heptahydrate from zinc-containing wastes described in the utility model comprises a base 13, a primary leaching reactor 1 and a secondary leaching reactor 2, the primary leaching reactor 1 and the secondary leaching reactor 2 are respectively arranged at the top ends of the base 13, a plate-frame filter press 4 is installed between the primary leaching reactor 1 and the secondary leaching reactor 2 through a mounting seat, the input ports of the plate-frame filter press 4 are respectively connected to the primary leaching reactor 1 and the secondary leaching reactor 2 through a feed hose A5, and a feed pump 6 is arranged on the feed hose A5;

[0025] An MVR evaporator 14 is installed on the top of the base 13 and on one side of the plate and frame filter press 4 through a mounting seat. The input port of the MVR evaporator 14 is connected to the output port of the plate and frame filter press 4 through a feed hose B19, and a feed valve 20 is provided on the feed hose B19. A discharge pipe 12 is provided on one side of the bottom end of the primary leaching reactor 1 and the secondary leaching reactor 2, and a discharge valve 11 is provided on the discharge pipe 12.

[0026] When in use, the system for preparing zinc sulfate heptahydrate from zinc-containing waste is convenient for extracting zinc sulfate heptahydrate from zinc-containing waste by secondary leaching, so that hazardous waste can be properly disposed of and processed into widely used zinc salt products, thereby enabling the recycling of metal resources.

[0027] For example, Figure 1 As shown, the utility model also includes that the tops of the primary leaching reactor 1 and the secondary leaching reactor 2 are both provided with reactor top connection ports 10 , and the tops of the reactor top connection ports 10 are engaged with reactor top covers 9 .

[0028] When in use, the reactor top cover 9 is used to seal the primary leaching reactor 1 and the secondary leaching reactor 2 .

[0029] For example, Figure 1 As shown, the utility model also includes that an electric stirrer 7 is installed on the top middle part of the reactor top cover 9 through a mounting seat, and the stirring ends of the electric stirrer 7 are respectively located inside the primary leaching reactor 1 and the secondary leaching reactor 2.

[0030] When in use, the electric stirrer 7 is used to stir the solutions inside the primary leaching reactor 1 and the secondary leaching reactor 2 to increase the reaction rate.

[0031] For example, Figure 1 As shown, the utility model further includes that a feeding pipe 8 is arranged on the top of the reactor top cover 9 and on one side of the electric stirrer 7 , and a feeding control valve 3 is arranged on the feeding pipe 8 .

[0032] When in use, the feed control valve 3 is opened and the feed pipe 8 is used to conveniently add the raw materials into the primary leaching reactor 1 and the secondary leaching reactor 2 .

[0033] For example, Figure 1 As shown, the utility model further includes that a discharge port 16 is provided at one side of the bottom end of the MVR evaporator 14 and a discharge sealing plate 15 is installed at one side of the discharge port 16 by screws.

[0034] When in use, the discharging sealing plate 15 is opened and the discharging port 16 is used to conveniently take out the granular zinc sulfate heptahydrate crystals.

[0035] For example, Figure 1 , 2 As shown, the utility model also includes that a supporting side plate 18 is installed on the other end of the top of the base 13 through bolts, and a UV purification lamp 17 is installed on the inner side of the supporting side plate 18 through a lamp holder.

[0036] When in use, the UV purification lamp 17 is used to generate ultraviolet rays, which is convenient for sterilizing and disinfecting the surrounding area of ​​the equipment.

[0037] When the utility model is used, the raw material is put into a primary leaching reaction kettle 1, the solid-liquid ratio is 1:4, 98% sulfuric acid is used for leaching, the temperature is controlled at 60-65°C, the pH value at the reaction end point is 5.0-5.5, the reaction is 1h, the leaching solution is used for impurity removal, the leaching residue is added to a secondary leaching reaction kettle 2 for secondary leaching, the solid-liquid ratio is 1:4, 98% sulfuric acid is used for leaching, the temperature is controlled at 60-65°C, after the pH value of the solution is adjusted to 2.0, 98% sulfuric acid is continuously added so that the H+ concentration in the solution is 1mol / L, the reaction time is 1h, and the secondary leaching solution is used for primary leaching of the next batch of raw materials;

[0038] Utilize the plate and frame filter press 4 to filter and remove impurities. When the solution temperature is heated to 40-50°C, select excess zinc powder to replace metal cations such as Cu2+, Cr3+, Pb2+, Cd2+, As3+, Sn2+ in the leaching solution, reduce them to metal elemental form and enter the solid phase, then add nickel removal agent to make Ni2+ react to form precipitation, filter and separate, and proceed to the next step of impurity removal. Under the conditions of temperature 40-50°C and pH value 5.0, add potassium permanganate to oxidize Fe2+ and Mn2+ to form FeOH3 and MnO2 respectively for removal;

[0039] During the reaction, the pH value is maintained at 5.0, and then an excess of NaF is added to selectively precipitate Ca2+ and Mg2+ in the solution. After the reaction is completed, a zinc sulfate solution free of other metal cations is obtained. The impurity-removed solution is heated and evaporated by an MVR evaporator 14. After being concentrated to 220 g / L, the solution is transferred to a crystallization reactor for crystallization;

[0040] By controlling the temperature and stirring speed and adding crystal seeds of a certain particle size, granular zinc sulfate heptahydrate crystals are obtained. The system for preparing zinc sulfate heptahydrate from zinc-containing waste is convenient for extracting zinc sulfate heptahydrate from zinc-containing waste by secondary leaching, so that hazardous wastes can be reasonably disposed of and processed into widely used zinc salt products, which can realize the recycling of metal resources.

[0041] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. A system for preparing zinc sulfate heptahydrate from zinc-containing waste, characterized in that: The invention comprises a base (13), a primary leaching reaction kettle (1) and a secondary leaching reaction kettle (2), wherein the primary leaching reaction kettle (1) and the secondary leaching reaction kettle (2) are respectively arranged at two ends of the top of the base (13), a plate-frame filter press (4) is installed between the primary leaching reaction kettle (1) and the secondary leaching reaction kettle (2) via a mounting seat, and the input ports of the plate-frame filter press (4) are respectively connected to the primary leaching reaction kettle (1) and the secondary leaching reaction kettle (2) via a feed hose A (5), and a feed pump (6) is arranged on the feed hose A (5); An MVR evaporator (14) is installed on the top of the base (13) and located on one side of the plate and frame filter press (4) through a mounting seat; an input port of the MVR evaporator (14) is connected to an output port of the plate and frame filter press (4) through a feed hose B (19); a feed hose B (19) is provided with a feed valve (20); and a discharge pipe (12) is provided on one side of the bottom end of each of the primary leaching reactor (1) and the secondary leaching reactor (2), and a discharge valve (11) is provided on the discharge pipe (12).

2. A system for preparing zinc sulfate heptahydrate from zinc-containing waste according to claim 1, characterized in that: The tops of the primary leaching reactor (1) and the secondary leaching reactor (2) are both provided with reactor top connection ports (10), and the tops of the reactor top connection ports (10) are engaged with reactor top covers (9).

3. A system for preparing zinc sulfate heptahydrate from zinc-containing waste according to claim 2, characterized in that: An electric stirrer (7) is installed at the middle part of the top of the reactor top cover (9) via a mounting seat, and stirring ends of the electric stirrer (7) are respectively located inside the primary leaching reactor (1) and the secondary leaching reactor (2).

4. A system for preparing zinc sulfate heptahydrate from zinc-containing waste according to claim 3, characterized in that: A feeding pipe (8) is arranged on the top of the reactor top cover (9) and on one side of the electric stirrer (7), and a feeding control valve (3) is arranged on the feeding pipe (8).

5. The system for preparing zinc sulfate heptahydrate from zinc-containing waste according to claim 1, characterized in that: A discharge port (16) is provided on one side of the bottom end of the MVR evaporator (14), and a discharge sealing plate (15) is installed on one side of the discharge port (16) by means of screws.

6. The system for preparing zinc sulfate heptahydrate from zinc-containing waste according to claim 1, characterized in that: A supporting side plate (18) is installed at the other end of the top of the base (13) via bolts, and a UV purification lamp (17) is installed on the inner side of the supporting side plate (18) via a lamp holder.

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