Zinc hydrometallurgy cobalt removal purification tower

Abstract

The invention discloses a zinc hydrometallurgy cobalt removal purification tower which is used for achieving zinc hydrometallurgy cobalt removal, continuous treatment can be achieved, and the reaction speed of the whole treatment process is increased through the combined action of a first-stage stirrer, a second-stage stirrer and a third-stage stirrer. The reaction temperature of each step of the whole treatment process can be increased under the combined action of the square tube heat exchanger, the circular tube type heat exchanger and the coil tube type heat exchanger, the reaction temperature is further increased, and the reaction time is shortened. According to the zinc hydrometallurgy cobalt removal device, equipment in each step is basically designed to be in a tower shape according to the technology and functions, the occupied area is small, the process is short, pipelines do not need to be prolonged basically, the production efficiency is high, the safety coefficient is high, and the construction cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrometallurgical zinc smelting, purification and cobalt removal technology in nonferrous metallurgical industry, and in particular relates to a hydrometallurgical zinc smelting, cobalt removal and purification tower. Background Art

[0002] In the process of hydrometallurgy, the most important two processes are purification and electrolysis. The efficiency and quality of the purification process directly determine the output and quality of the electrolysis process, which is the basis of product quality. If the purification process cannot produce qualified new liquid, various product quality problems will occur, reducing production efficiency and increasing process energy consumption. Zinc smelting cobalt-containing waste slag is a kind of cobalt slag produced in the process of zinc hydrometallurgy. Its composition is relatively complex. In addition to valuable metals such as cobalt, nickel, and zinc, it also contains high sulfur and organic matter. Since this kind of waste slag is difficult to handle, most zinc hydrometallurgy manufacturers store this kind of waste slag. The traditional methods used for cobalt removal in the zinc smelting process are mainly xanthate cobalt removal and β-naphthol cobalt removal. Xanthate cobalt removal is gradually eliminated due to its serious environmental pollution, and β-naphthol cobalt removal is rarely used due to its high cost.

[0003] At present, the purification and cobalt removal processes mainly adopted by domestic zinc smelting enterprises are mainly the traditional three-stage reverse antimony method and the reagent cobalt removal method. There is also an energy-saving hydrometallurgical zinc smelting purification and cobalt removal method disclosed by the Chinese invention patent with the announcement number CN 113897484 A. The existing hydrometallurgical zinc smelting cobalt removal devices basically place the equipment and devices of each step separately at different heights and positions, with poor correlation between each other, large amount of reagents added, and no repeated use of clean slag. The cobalt removal and utilization efficiency are low, the consumption is large, the equipment is scattered, the floor space is large, and the process is long. Moreover, the pipelines are cumbersome, it is impossible to concentrate and operate quickly, it is easy to leak, the safety factor is low, and the construction cost is high. It is not conducive to controlling the reaction temperature and reaction time of each step of the entire treatment process, the utilization efficiency of the reagent is not high, and the purification depth needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a hydrometallurgical zinc smelting cobalt removal purification tower to solve the problems raised in the above background technology.

[0005] The technical solution adopted by the present invention is as follows: A hydrometallurgical zinc smelting and cobalt removal purification tower comprises a primary liquid purification device, a secondary liquid purification device, a tertiary liquid purification device and an adsorption device which are arranged in sequence from top to bottom; the characteristics are as follows: a primary motor is arranged at the top center of the primary liquid purification device, and the output shaft of the primary motor passes through the top cover of the primary liquid purification device and is connected to a primary agitator in its cavity; a zinc oxide clear liquid inlet and a zinc powder inlet are arranged on both sides of the top cover respectively; a square tube heat exchanger is arranged at the top of the inner cavity of the primary liquid purification device, a primary filter is arranged at the bottom of the inner cavity of the primary liquid purification device, a primary liquid outlet is arranged at the bottom of the filter, and the primary liquid outlet is connected to the secondary liquid purification device; a secondary motor is arranged at the top center of the secondary liquid purification device, and the output shaft of the secondary motor passes through the top of the secondary liquid purification device and is connected to the secondary agitator in its cavity; a secondary liquid purification device is arranged at the upper edge of the inner cavity A circular tube heat exchanger, a secondary filter screen is provided at the bottom of the inner cavity of the secondary liquid purification device, a secondary liquid outlet is provided at the bottom of the secondary filter screen leading to the tertiary liquid purification device, a purification agent inlet is provided at one side of the top of the tertiary liquid purification device, a coil heat exchanger is provided around the inner cavity of the tertiary liquid purification device, a tertiary stirring motor is provided at the center outside the cavity, the output shaft of the tertiary stirring motor passes through the bottom of the tertiary liquid purification device and is connected to the tertiary stirrer in its inner cavity, a tertiary filter screen is provided at the bottom of the inner cavity of the tertiary liquid purification device, a tertiary clean liquid outlet (23) is provided at the bottom of the tertiary filter screen, the tertiary clean liquid outlet is connected to an adsorption device, an activated carbon inlet is provided at one side of the top of the adsorption device, stirrers are provided at both sides of the upper part of the adsorption device, an activated carbon layer is provided in the middle of the adsorption device, an adsorption filter screen is provided at the bottom, and a clean liquid outlet is provided at one side of the bottom of the adsorption device.

[0006] A further technical solution is that a square tube heat exchanger is provided in the first-stage liquid purification device, and the square tube heat exchanger is evenly distributed on the inner cavity wall of the first-stage liquid purification device.

[0007] A further technical solution is that the activated carbon loading is 2-3 kg / m 3 .

[0008] A further technical solution is that the primary filter, the secondary filter, the tertiary filter and the adsorption filter are made of acid and alkali resistant materials and are steel lined with PO for corrosion protection.

[0009] Due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention utilizes a primary liquid purification device to achieve primary high-temperature copper and cadmium removal, utilizes a secondary liquid purification device to achieve secondary high-temperature preliminary cobalt removal, and utilizes a tertiary liquid purification device to achieve tertiary high-temperature deep cobalt removal.

[0010] 2. The equipment of the present invention is designed with a first-stage agitator, a second-stage agitator, and a third-stage agitator to work together to speed up the reaction speed of the entire treatment process. The different forms of design and joint action of square tube heat exchangers, circular tube heat exchangers, coil heat exchangers, etc. can increase the reaction temperature of each step of the entire treatment process, further increase the reaction temperature, and reduce the reaction time.

[0011] 3. The device of the present invention uses alloy zinc powder instead of metal zinc powder to remove residual cadmium and germanium. Under the conditions of controlling the reaction temperature at 70°C, the reaction time at 60 min, and the excess multiple of alloy zinc powder at 3 times, the cadmium ions can be removed to less than 10 mg / L, the cadmium removal rate reaches more than 99%, the germanium removal rate is increased to more than 75%, and the cobalt loss rate is controlled within 10%; 4. The device of the present invention can combine zinc powder with special reagents to form a four-stage purification, that is, the first stage of low-temperature metal zinc powder removes copper and cadmium, the second stage of low-temperature alloy zinc powder removes residual cadmium and germanium, the third stage of high-temperature (80-85°C) low-cobalt slag pre-removes cobalt and nickel, the fourth stage of high-temperature (80-85°C) sodium fumei deep removal of cobalt, the fourth stage of low-cobalt slag returns to the third stage of purification to remove cobalt again, and the three-clean slag reacts with the cadmium-depleted liquid to remove cobalt again, which improves the utilization efficiency of the reagents, improves the purification depth, and realizes the optimization of the purification process and the upgrading of equipment; 5. The hydrometallurgical zinc smelting and cobalt removal device of the present invention is designed in a tower shape according to the process and function, with a small footprint and a short process. It basically does not need to extend the pipeline, has high production efficiency, high safety factor and low construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural cross-sectional view of a hydrometallurgical zinc smelting cobalt removal purification tower according to the present invention; Figure 2 This is a structural front view of a hydrometallurgical zinc smelting cobalt removal purification tower according to the present invention. Figure 3 This is a top view of the primary purification device of the present invention. Figure 4 This is a top view of the secondary purification device of the present invention. Figure 5 It is a top view of the three-stage purification device described in the present invention.

[0013] In the figure: 1. primary liquid purification device; 2. secondary liquid purification device; 3. tertiary liquid purification device; 4. adsorption device; 5. primary motor; 6. top cover; 7. primary agitator; 8. zinc oxide clear liquid inlet; 9. zinc powder inlet; 10. square tube heat exchanger; 11. primary filter; 12. primary liquid outlet; 13. secondary motor; 14. secondary agitator; 15. circular tube heat exchanger; 16. secondary filter; 17. secondary liquid outlet; 18. purification agent inlet; 19. coil heat exchanger; 20. tertiary stirring motor; 21. tertiary agitator; 22. tertiary filter; 23. tertiary clean liquid outlet; 24. activated carbon inlet; 25. adsorption agitator; 26. activated carbon layer; 27. adsorption filter; 28. clean liquid outlet. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] like Figure 1-Figure 5 A hydrometallurgical zinc smelting cobalt removal purification tower comprises a primary liquid purification device 1, a secondary liquid purification device 2, a tertiary liquid purification device 3 and an adsorption device 4. The top center of the primary liquid purification device 1 is provided with an output shaft of a primary motor 5, which passes through a top cover 6 and is connected to a primary agitator 7 in the device cavity; both sides of the top cover 6 are provided with a zinc oxide clear liquid inlet 8 and a zinc powder inlet 9, respectively; a square tube heat exchanger 10 is provided at the top of the inner cavity of the primary liquid purification device 1; a primary filter screen 11 is provided at the bottom of the inner cavity of the primary liquid purification device 1; a primary liquid outlet 12 is provided at the bottom of the filter screen, and the primary liquid outlet 12 is connected to the secondary liquid purification device 2; a A secondary motor 13 is arranged, and the secondary motor 13 passes through the top of the secondary liquid purification device 2 and is connected to the secondary agitator 14 in the cavity of the device. A circular tube heat exchanger 15 is arranged at the upper edge of the inner cavity of the secondary liquid purification device 2, and a secondary filter screen 16 is arranged at the bottom of the inner cavity of the secondary liquid purification device 2. A secondary liquid outlet 17 leading to the tertiary liquid purification device 3 is arranged at the bottom of the secondary filter screen 16, and a purification agent inlet 18 is arranged on one side of the top of the tertiary liquid purification device 3. A coil heat exchanger 19 is arranged around the inner cavity of the tertiary liquid purification device 3, and a tertiary stirring motor 20 is arranged at the center outside the cavity of the tertiary liquid purification device 3, and the tertiary agitator 21 connected to the inner cavity is connected through the bottom. A three-stage filter screen 22 is provided at the bottom of the inner cavity of the three-stage liquid purification device, a three-stage liquid purification outlet 23 is provided at the bottom of the three-stage filter screen 22, and the three-stage liquid purification outlet 23 is connected to the adsorption device 4. An activated carbon inlet 24 is provided on one side of the top of the adsorption device 4, and adsorption stirrers 25 are provided on both sides. An activated carbon layer 26 is provided in the middle of the adsorption device, an adsorption filter screen 27 is provided at the bottom, and a liquid purification outlet 28 is provided on one side of the bottom of the adsorption device 4. The first-stage liquid purification device 1 is provided with square tube heat exchangers 10 , and the square tube heat exchangers 10 are evenly distributed on the inner cavity wall of the first-stage liquid purification device 1 .

[0016] The activated carbon 26 is multi-faceted and irregular, and the filling amount is 2-3 kg / m 3 ; The primary filter 11, the secondary filter 12, the tertiary filter 22, and the adsorption filter 27 are all made of acid-resistant and alkali-resistant materials, which are made of PP fiber woven in one piece, with good acid and alkali resistance, good corrosion resistance, low resistance, and can be repeatedly cleaned, which is very economical. It can capture long and short fibers and dust particles, is easy to clean, and the filtration efficiency is not affected by cleaning. It has good impact resistance and steel lining PO anti-corrosion. When the adsorption material is saturated, the blockage is serious, and the filtration rate is reduced, the filter can be replaced.

[0017] When used, the process of removing cobalt using a hydrometallurgical zinc smelting cobalt removal purification tower is divided into four steps: Step 1, primary high-temperature primary copper cadmium, add the clean zinc oxide solution into the primary purification device 1, heat it to 70-75°C through the square tube heat exchanger 10, add zinc powder in an amount of 4-5kg / m³, drive the primary agitator 7 through the primary motor 5 to stir at a medium intensity, react for 1-1.5 hours, then filter and enter the secondary purification device 2; Step 2: Preliminary cobalt removal at secondary high temperature. The liquid after primary purification is further heated to 85-90°C through a circular tube heat exchanger 15, and 4-5kg / m³ of zinc powder is added in an amount of 2-3kg / m³. The secondary motor 13 drives the secondary agitator 14 to stir with equal intensity. After reacting for 1-1.5 hours, it is filtered and enters the tertiary purification device 3.

[0018] Step 3: Three-stage high-temperature deep cobalt removal: the liquid temperature after the secondary purification is maintained at 85-90°C by means of a coil heat exchanger 19, a cobalt removal agent is added at 0.3-0.5 kg / m³, and a three-stage agitator 21 is driven by a three-stage agitator motor 20 to perform medium-intensity agitation. After reacting for 1-1.5 hours, the mixture is filtered and enters the adsorption tower; Step 4: absorb organic impurities. Add activated carbon at 2-3 kg / m³ to the liquid after the third-stage purification and filtration, stir it with medium intensity through the adsorption stirrer 25, and filter it after reacting for 0.5-1 hour. The adsorption stirrer 25 includes a stirring motor and a stirring paddle.

[0019] The above are only preferred embodiments of the present invention.

Claims

1. A hydrometallurgical zinc smelting cobalt removal purification tower, characterized in that: The device comprises a first-stage liquid purification device (1), a second-stage liquid purification device (2), a third-stage liquid purification device (3) and an adsorption device (4) which are arranged in sequence from top to bottom; a first-stage motor (5) is arranged at the top center of the first-stage liquid purification device (1); an output shaft of the first-stage motor (5) passes through the top cover (6) of the first-stage liquid purification device (1) and is connected to a first-stage agitator (7) in the cavity thereof; a zinc oxide clear liquid inlet (8) and a zinc powder inlet (9) are respectively arranged on both sides of the top cover (6); a square tube heat exchanger (10) is arranged at the top of the inner cavity of the first-stage liquid purification device The first-level liquid purification device (1) has a first-level filter screen (11) at the bottom of the inner cavity, a first-level liquid outlet (12) at the bottom of the first-level filter screen (11), the first-level liquid outlet (12) is connected to the second-level liquid purification device (2), a second-level motor (13) is arranged at the top center of the second-level liquid purification device (2), the output shaft of the second-level motor (13) passes through the top of the second-level liquid purification device (2) and is connected to the second-level agitator (14) in the cavity, a circular tube heat exchanger (15) is arranged at the upper edge of the inner cavity of the second-level liquid purification device (2), and the second-level liquid purification device (2) is provided with a second-level motor (13). A secondary filter (16) is provided at the bottom of the inner cavity of the device (2); a secondary liquid outlet (17) is provided at the bottom of the secondary filter (16) leading to the third-stage liquid purification device (3); a purification agent inlet (18) is provided at one side of the top of the third-stage liquid purification device (3); a coil-type heat exchanger (19) is provided around the inner cavity of the third-stage liquid purification device (3); a third-stage stirring motor (20) is provided at the center outside the cavity; an output shaft of the third-stage stirring motor (20) passes through the bottom of the third-stage liquid purification device (3) and is connected to a third-stage stirrer (21) in the inner cavity thereof; A three-stage filter screen (22) is provided at the bottom of the inner cavity of the three-stage liquid purification device (3); a three-stage liquid purification outlet (23) is provided at the bottom of the three-stage filter screen (22); the three-stage liquid purification outlet (27) is connected to the adsorption device (4); an activated carbon inlet (23) is provided at one side of the top of the adsorption device (4); adsorption stirrers (25) are provided at both sides of the upper part of the adsorption device (4); an activated carbon layer (26) is provided in the middle of the adsorption device (4); an adsorption filter screen (27) is provided at the bottom; and a liquid purification outlet (28) is provided at one side of the bottom of the adsorption device (4).

2. A cobalt removal purification tower for hydrometallurgy of zinc according to claim 1, characterized in that: The square tube heat exchangers (10) are evenly distributed on the inner cavity wall of the first-stage liquid purification device (1).

3. A cobalt removal purification tower for hydrometallurgy of zinc according to claim 1, characterized in that: The activated carbon loading is 2-3 kg / m 3 .

4. A cobalt removal purification tower for hydrometallurgy of zinc according to claim 1, characterized in that: The primary filter screen (11), the secondary filter screen (16), the tertiary filter screen (22), and the adsorption filter screen (27) are all made of acid-resistant and alkali-resistant materials.

Images