Ferrous sulfate heptahydrate separating and washing process and vertical centrifugal machine

Abstract

The invention belongs to the technical field of titanium dioxide production by a sulfuric acid method, and particularly relates to a ferrous sulfate heptahydrate separating and washing process and a vertical centrifugal machine. According to the separation and washing process, a solid-liquid mixture transfer barrel, a vertical centrifugal machine, a ferrous collecting hopper, a humidifying and mixing conveyor, a ferrous spiral feeder, a horizontal pushing centrifugal machine, a ferrous spiral discharging machine, a titaniferous solution storage barrel, a light washing solution storage barrel, a concentrated washing solution storage barrel, a light washing solution conveying pump, a concentrated washing solution conveying pump and a titaniferous solution conveying pump are included. According to the invention, the investment is greatly reduced, and the plant area required by equipment installation is also greatly reduced; according to the capacity configuration of annual production of 30,000 tons of titanium dioxide, the required plant area is 150m, and the investment of core equipment is about 1500,000 yuan.

Description

Technical Field

[0001] The present invention belongs to the technical field of titanium dioxide production by sulfuric acid process, and particularly relates to a separation and washing process for ferrous sulfate heptahydrate and a vertical centrifuge. Background Art

[0002] In the production of titanium dioxide by sulfuric acid process, for the titanium liquid obtained from the acidolysis reaction, the mass ratio of iron ions to titanium dioxide (hereinafter simply referred to as the iron-titanium ratio) is about between 0.95 and 1.1, while the iron-titanium ratio required for the hydrolysis reaction is 0.26 to 0.36. Therefore, it is necessary to reduce the iron content of the titanium liquid obtained from the acidolysis reaction; the commonly used method in the industry is to cool the titanium liquid obtained from the acidolysis reaction with an iron-titanium ratio of about 0.95 to 1.1 to 18°C to 23°C. At this time, a large amount of iron ions will precipitate in the form of ferrous sulfate heptahydrate crystals, and then solid-liquid separation is carried out, and the ferrous sulfate heptahydrate crystals are appropriately washed, so as to obtain a titanium liquid with an iron-titanium ratio of 0.26 to 0.36 that meets the hydrolysis requirements, and at the same time, a relatively clean ferrous sulfate heptahydrate crystal product and a relatively good titanium recovery rate are obtained.

[0003] Among them, separating and washing the ferrous sulfate heptahydrate crystals from the titanium liquid is an important link in the production of titanium dioxide by sulfuric acid process. At present, more than 95% of the enterprises in the industry use vacuum disc filters and horizontal pusher centrifuges to complete this separation and washing operation; there are the following four prominent problems with this method: First, the investment is large, and the plant area required for equipment installation is wide; according to the production capacity configuration of 30,000 tons of titanium dioxide per year, a plant area of 300 m² is required, and the investment in core equipment is about 2 million yuan. Second, the electrical power configuration of the equipment is large and the power consumption is high; according to the production capacity configuration of 30,000 tons of titanium dioxide per year, the power of the core equipment configuration is 325 kw, and the power consumption per ton of product is about 52 kwh. Third, the concentration of the separated titanium liquid is low, increasing the energy consumption of subsequent concentration operations; the industry average concentration is 158 g / L to 162 g / L, and the steam consumption for concentration is about 1.3 to 1.6 tons / ton of titanium dioxide. Fourth, the ferrous sulfate heptahydrate crystal product separated out has a high content of residual titanium dioxide (hereinafter simply referred to as titanium) due to insufficient washing, which not only affects the quality of the ferrous sulfate heptahydrate crystal product but also reduces the titanium recovery rate; the current industry average titanium content in ferrous sulfate heptahydrate crystals is 0.28% to 0.40%.

[0004] In order to solve the four prominent problems existing in the existing process, a separation and washing process for ferrous sulfate heptahydrate has been invented, significantly improving the main economic indicators of titanium dioxide production by sulfuric acid process. Summary of the Invention

[0005] In view of the above problems, the present invention provides a separation and washing process for ferrous sulfate heptahydrate and a vertical centrifuge to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: a separation and washing process for ferrous sulfate heptahydrate, including a solid-liquid mixture transfer barrel, a vertical centrifuge, a ferrous aggregate hopper, a humidifying and mixing conveyor, a ferrous spiral feeder, a horizontal pusher centrifuge, a ferrous spiral discharge machine, a titanium liquid storage barrel, a light washing liquid storage barrel, a concentrated washing liquid storage barrel, a light washing liquid transfer pump, a concentrated washing liquid transfer pump, and a titanium liquid transfer pump. The separation and washing process for ferrous sulfate heptahydrate includes the following steps: Step 1: The mixture of titanium liquid and ferrous sulfate heptahydrate crystals obtained by freezing is fed into the solid-liquid mixture transfer barrel. After reaching a liquid level of 50% to 80% of the barrel capacity, the ferrous spiral conveyor, horizontal pusher centrifuge, ferrous spiral feeder, humidifying and mixing conveyor, and vertical centrifuge are respectively started. Then, the solid-liquid mixture is transported to the vertical centrifuge. At this time, the mixture of titanium liquid and ferrous sulfate heptahydrate crystals is continuously fed into the solid-liquid mixture transfer barrel to keep the feeding and discharging balanced, and the liquid level of the solid-liquid mixture transfer barrel always remains between 50% and 80%. Step 2: Start the concentrated washing liquid transfer pump, and its flow rate can be automatically frequency-modulated according to the working current of the vertical centrifuge, so that it can input concentrated washing liquid containing 55 to 65 g / L of titanium at a ratio of 4% to 7% of the amount of the solid-liquid mixture entering the vertical centrifuge to preliminarily wash the ferrous sulfate heptahydrate crystals separated by the vertical centrifuge. The washing liquid after washing is directly mixed into the titanium liquid for recycling. Step 3: Start the light washing liquid transfer pump, and its flow rate can be automatically frequency-modulated according to the working current of the vertical centrifuge, so that it can evenly spray light washing liquid containing 18 to 28 g / L of titanium at a ratio of 10% to 20% of the mass of ferrous sulfate heptahydrate entering the humidifying and mixing conveyor. The light washing liquid containing 18 to 28 g / L of titanium fully penetrates and mixes with the simultaneously entering ferrous sulfate heptahydrate crystals. Then, the mixture enters the ferrous spiral feeder, and the ferrous spiral feeder evenly feeds the mixture into the horizontal pusher centrifuge for separation, washing, and centrifugal dehydration. Step 4: Evenly input washing cold clear water into the horizontal pusher centrifuge at a ratio of 12% to 23% of the mass of ferrous sulfate heptahydrate entering the horizontal pusher centrifuge. The mixture entering the horizontal pusher centrifuge contains 17% to 30% of free liquid phase. First, it is centrifugally dehydrated in the first-stage drum, and the free liquid phase content drops to 4% to 6%. Then, it is pushed by the piston to the second-stage drum for cold clear water washing and separation, and finally, it is pushed by the piston to the third-stage drum for dehydration and centrifugal dehydration. The ferrous sulfate crystals dehydrated and centrifuged by the third-stage drum have a free liquid phase content dropping to 3% to 5% and a titanium content of 0.1% to 0.18%. These ferrous sulfate crystals are finally discharged from the solid-phase discharge port of the horizontal pusher centrifuge. The light washing liquid is discharged from the light liquid phase discharge port and flows into the light washing liquid storage barrel, and the concentrated washing liquid is discharged from the concentrated liquid phase discharge port and flows into the concentrated washing liquid storage barrel to complete the separation operation.

[0007] The present invention also discloses a vertical centrifuge, including: A centrifugal cylinder for accommodating a mixture of titanium liquid and ferrous sulfate heptahydrate crystals; A separation assembly connected to the inner side of the centrifugal cylinder; A feeding assembly installed at the feeding port of the centrifugal cylinder for screening and conveying the mixture; A centrifugal assembly for centrifuging the mixture; The centrifugal assembly includes a fine centrifugal device, and the fine centrifugal device includes a centrifugal cone, a first paddle, a first centrifugal screen, and a coarse centrifugal device sleeved outside the first centrifugal screen. The first paddle is connected to the surface of the centrifugal cone, and the centrifugal cone, the first centrifugal screen, and the coarse centrifugal device are all installed on the separation assembly, and the centrifugal cone and the first centrifugal screen can cooperate with the first paddle to realize the centrifuging operation of the fine mixture.

[0008] Further, the separation assembly includes: A hollowed-out disk for installing the centrifugal assembly and capable of driving the centrifugal assembly to rotate, and a power assembly for driving the hollowed-out disk to rotate is installed at the bottom of the hollowed-out disk; A support ring connected between the centrifugal cylinder and the hollowed-out disk, and the area formed between the outer side of the support ring and the inner side of the centrifugal cylinder can be used for guiding the water flow; A diversion groove connected to the inner side of the support ring for collecting the titanium liquid; A diversion pipe connected between the diversion groove and the support ring for guiding the titanium liquid to the outer area of the support ring.

[0009] Further, the feeding assembly includes: A feeding hopper for guiding the mixture into the centrifugal cylinder, A screening cover for screening the mixture; An annular baffle sleeved outside the screening cover for restricting the mixture; A screw blade connected to the surface of the screening cover and capable of cooperating with the annular baffle to realize the downward guiding of the mixture; A first driving member connected to the top of the screening cover for driving the screening cover and the screw blade to rotate in the opposite direction to the centrifugal cone to realize the guiding and screening of the mixture. A protection assembly for shielding the mixture is arranged at the top of the first driving member.

[0010] Further, the protection assembly includes: A protection cone connected to the inner side of the feeding hopper and used for fixing the first driving member.

[0011] Further, the coarse centrifugal device includes: The centrifugal cover is sleeved outside the first centrifugal screen and is used to separate the fine mixture and the coarse mixture; The second centrifugal screen is sleeved outside the centrifugal cover; The second paddle is connected to the outside of the centrifugal cover, and the second paddle can cooperate with the centrifugal cover and the second centrifugal screen to perform centrifugal operation on the coarse mixture under the action of the power assembly; The material guiding cover is connected to the second centrifugal screen and is used to restrict and guide the coarse mixture.

[0012] Furthermore, a vibration assembly for driving the screening cover to vibrate is arranged inside the screening cover, and the vibration assembly includes: The vibration rod is used to transmit the vibration generated by the centrifugal cone to the screening cover; The fixed pipe is connected to the inner wall of the screening cover and is used to install the vibration rod; The elastic member is located inside the fixed pipe and can press the vibration rod against the surface of the centrifugal cone; The ball is connected to the end of the vibration rod, and when the vibration rod moves along the surface of the centrifugal cone, it is used to reduce the friction between the vibration rod and the centrifugal cone; The annular tooth groove is formed on the surface of the centrifugal cone. When the ball moves along the annular tooth groove, the ball can cooperate with the annular tooth groove to generate vibration.

[0013] Furthermore, the power assembly includes: The second driving member is arranged outside the centrifugal cylinder; The transmission is connected to the bottom of the hollowed-out disk and is used to cooperate with the second driving member to adjust the rotation speed of the hollowed-out disk; The transmission member is connected between the transmission and the second driving member and is used to transmit the power of the second driving member to the transmission. Moreover, a through hole for inserting the transmission member is formed through the centrifugal cylinder.

[0014] The technical effects and advantages of the present invention: 1. The investment is greatly reduced, and the plant area required for equipment installation is also significantly reduced; for a production capacity configuration of 30,000 tons of titanium dioxide per year, the plant area required is 150 m², and the investment in core equipment is about 1.5 million yuan; 2. The electrical power configured for the equipment is significantly reduced, and the power consumption is also significantly reduced; for a production capacity configuration of 30,000 tons of titanium dioxide per year, the power of its core equipment configuration is 130 kw, and the power consumption per ton of product is about 21 kwh; 3. The concentration of the separated titanium liquid is significantly increased, reducing the energy consumption of subsequent concentration operations; the average concentration is increased to 168 g / L to 175 g / L, and the steam consumption for concentration is reduced to 0.93 to 1.2 tons per ton of titanium dioxide; 4. The separated ferrous sulfate heptahydrate crystal product has a lower residual titanium dioxide content due to more thorough washing, which not only improves the quality of the ferrous sulfate heptahydrate crystal product but also increases the recovery rate of titanium dioxide. Currently, the average titanium content in the ferrous sulfate heptahydrate crystals separated by the newly invented separation and washing process for ferrous sulfate heptahydrate has been reduced to 0.1% to 0.18%. 5. Compared with the traditional vacuum disc filter unit with a power of 230 kw, the driving power is reduced to 37 kw, resulting in much lower energy consumption. Compared with the traditional vacuum disc filter unit, it occupies less floor space. The fine pore sieve mesh adapted to the new technology can make the volume percentage of ferrous sulfate heptahydrate crystals carried by the separated titanium liquid less than 0.5%. The conical drum with a high separation coefficient enables the content of the free liquid phase of the separated ferrous sulfate heptahydrate to be less than 6%, and its titanium content to be less than 0.75%. 6. By providing a coarse centrifugal device in the present invention, during the centrifugation of the mixture, the screening cover can screen the mixture according to different particle sizes, so that the mixture with small particle sizes and the mixture with large particle sizes can enter the fine centrifugal device and the coarse centrifugal device respectively. Furthermore, the vertical centrifuge in the present invention can apply different centrifugal forces according to different particle sizes of the mixture, improving the centrifugation effect on the mixture. 7. By providing a feeding assembly in the present invention, when the mixture of ferrous sulfate heptahydrate crystals is added to the feeding hopper, as the first driving member drives the screening cover to rotate, the auger blades connected to the surface of the screening cover can actively convey the mixture accumulated at the feeding hopper downward in cooperation with the annular baffle, effectively preventing the mixture from clogging in the feeding hopper. 8. By providing a vibration assembly in the present invention, during the process of feeding the mixture into the centrifugal cover, as the ball moves along the annular tooth groove, the ball can cooperate with the annular tooth groove to generate vibration. Thus, when the mixture contacts the surface of the screening cover, the screening cover can screen the mixture with different particle sizes better and faster, improving the screening effect. In addition, the vibration generated by the vibration rod in cooperation with the annular tooth groove can make the mixture remaining on the screening cover separate from the screening cover more easily, reducing the probability of the mixture remaining on the screening cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the process flow chart of the present invention; Figure 2 is the overall structural schematic diagram of the vertical centrifuge in the present invention; Figure 3 is the three-dimensional sectional view of the centrifugal cylinder, the second centrifugal screen, the annular baffle and the feeding hopper in the present invention; Figure 4 is the three-dimensional sectional view of the centrifugal cylinder, the second centrifugal screen, the centrifugal cover and the first centrifugal screen and other structures in the present invention; Figure 5 is in the present inventionFigure 4 Enlarged view of part A; Figure 6 is a three-dimensional schematic diagram of the centrifugal cover and the second paddle in the present invention; Figure 7 is a three-dimensional schematic diagram of the centrifugal cone and the first paddle in the present invention; Figure 8 is a three-dimensional schematic diagram of the vibrating rod, the fixed pipe, the elastic member and the ball in the present invention; Figure 9 is a three-dimensional schematic diagram of the screening cover, the auger blade and the first driving member in the present invention; Figure 10 is a three-dimensional schematic diagram of the diversion groove and the diversion pipe in the present invention.

[0016] In the figure: 1, solid-liquid mixture transfer barrel; 2, vertical centrifuge; 3, ferrous aggregate hopper; 4, humidifying and mixing conveyor; 5, ferrous spiral feeder; 6, horizontal pusher centrifuge; 7, ferrous spiral discharger; 8, titanium liquid storage barrel; 9, light washing liquid storage barrel; 10, concentrated washing liquid storage barrel; 11, light washing liquid transfer pump; 12, concentrated washing liquid transfer pump; 13, titanium liquid transfer pump; 14, centrifugal cylinder; 15, centrifugal cone; 16, first paddle; 17, first centrifugal screen; 18, hollowed-out disc; 19, support ring; 20, feed hopper; 21, screening cover; 22, annular enclosing plate; 23, auger blade; 24, first driving member; 25, protective cone; 26, centrifugal cover; 27, second centrifugal screen; 28, second paddle; 29, material guiding cover; 30, vibrating rod; 31, fixed pipe; 32, elastic member; 33, ball; 34, annular tooth groove; 35, second driving member; 36, transmission; 37, transmission member; 38, fixed base; 39, diversion groove; 40, diversion pipe; 41, liquid mixture discharge port. Detailed implementation manners

[0017] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0018] Embodiment 1: The present invention provides a ferrous sulfate heptahydrate separation and washing process as shown in Figures 1 to 10 which includes a solid-liquid mixture transfer barrel, a vertical centrifuge, a ferrous aggregate hopper, a humidifying and mixing conveyor, a ferrous spiral feeder, a horizontal pusher centrifuge, a ferrous spiral discharger, a titanium liquid storage barrel, a light washing liquid storage barrel, a concentrated washing liquid storage barrel, a light washing liquid transfer pump, a concentrated washing liquid transfer pump, and a titanium liquid transfer pump; The ferrous sulfate heptahydrate separation and washing process of the present invention has the following main units and auxiliary components: A manual valve, an electromagnetic flowmeter, and an electric control valve are installed at the discharge port of the solid-liquid mixture transfer barrel; The vertical centrifuge is provided with a feed inlet, a washing liquid inlet, a solid mixture discharge port, and a liquid mixture discharge port disposed on the side of the centrifuge cylinder; The ferrous sulfate aggregate hopper is a conical hopper with a larger upper part and a smaller lower part; The humidifying and mixing conveyor is provided with a light washing liquid inlet, a feed inlet, and a discharge port; The ferrous sulfate screw feeder is provided with a feed inlet and a discharge port; The horizontal pusher centrifuge has a mixture feed inlet, a clear water washing connection port, a concentrated washing liquid outlet, a light washing liquid outlet, and a solid mixture discharge port; The ferrous sulfate screw discharger is provided with a feed inlet and a discharge port; The titanium liquid storage barrel is provided with a discharge valve; Both the light washing liquid storage barrel and the concentrated washing liquid storage barrel are provided with a discharge valve; The tail end of the light washing liquid transfer pump is connected to the bottom valve of the light washing liquid storage barrel; The tail end of the concentrated washing liquid transfer pump is connected to the bottom valve of the concentrated washing liquid storage barrel; The tail end of the titanium liquid transfer pump is connected to the bottom valve of the titanium liquid storage barrel.

[0019] The said separation and washing process of ferrous sulfate heptahydrate includes the following steps: Step 1: The mixture of titanium liquid and ferrous sulfate heptahydrate crystals obtained by freezing is sent into the solid-liquid mixture transfer barrel. After reaching the liquid level of 50% to 80% of the barrel capacity, the ferrous sulfate screw conveyor, horizontal pusher centrifuge, ferrous sulfate screw feeder, humidifying and mixing conveyor, and vertical centrifuge are respectively started. Then, the manual discharge valve at the bottom of the solid-liquid mixture transfer barrel is opened, and through the precise control of the electric control valve, the material is evenly supplied to the vertical centrifuge; at this time, the mixture of titanium liquid and ferrous sulfate heptahydrate crystals is continuously sent into the solid-liquid mixture transfer barrel to keep the incoming material and the outgoing material in balance, and the liquid level of the solid-liquid mixture transfer barrel always remains between 50% and 80%; Step 2: Open the manual discharge valve at the bottom of the concentrated washing liquid storage barrel, and start the concentrated washing liquid transfer pump. Its flow rate can be automatically frequency-modulated according to the working current of the vertical centrifuge, so that it can input concentrated washing liquid containing 55 to 65 g / L of titanium at a ratio of 4% to 7% of the amount of the solid-liquid mixture entering the vertical centrifuge to preliminarily wash the ferrous sulfate heptahydrate crystals separated by the vertical centrifuge. The washing liquid after washing is directly mixed into the titanium liquid for recycling. After the first-stage washing of the ferrous sulfate separated by the vertical centrifuge with the concentrated washing liquid, its titanium content is also significantly reduced, creating good conditions for obtaining ferrous sulfate with a lower titanium content in the subsequent washing, separation, and centrifugation; Step 3: Open the manual discharge valve at the bottom of the dilute washing liquid storage barrel, and start the dilute washing liquid transfer pump. Its flow rate can be automatically frequency-adjusted according to the working current of the vertical centrifuge, so that it can be evenly sprayed into the dilute washing liquid containing 18 to 28 g / L of titanium at a ratio of 10% to 20% of the mass of ferrous sulfate heptahydrate entering the humidifying and mixing conveyor. The dilute washing liquid containing 18 to 28 g / L of titanium fully penetrates and mixes with the simultaneously entering ferrous sulfate heptahydrate crystals. Then the mixture enters the ferrous spiral feeder, and the ferrous spiral feeder 5 evenly sends the mixture into the horizontal pusher centrifuge for separation, washing, and dewatering; Step 4: Open the manual control valve for cold clear water washing of the horizontal pusher centrifuge. Its electric control valve can automatically adjust the opening of the electric valve according to the working current of the horizontal pusher centrifuge, so that it can evenly input cold clear water for washing at a ratio of 12% to 23% of the mass of ferrous sulfate heptahydrate entering the horizontal pusher centrifuge; The mixture entering the horizontal pusher centrifuge contains about 17% to 30% of free liquid phase. First, it is dewatered in the first-stage drum, and the free liquid phase content drops to about 4% to 6%; Then it is pushed by the piston to the second-stage drum for cold clear water washing and separation, and finally it is pushed by the piston to the third-stage drum for dewatering. The ferrous sulfate heptahydrate crystals dewatered and dried by the third-stage drum have a free liquid phase content dropping to about 3% to 5% and a titanium content of about 0.1% to 0.18%; These ferrous sulfate heptahydrate crystals are finally discharged from the solid-phase discharge port of the horizontal pusher centrifuge, the dilute washing liquid is discharged from the dilute liquid-phase discharge port and flows into the dilute washing liquid storage barrel, and the concentrated washing liquid is discharged from the concentrated liquid-phase discharge port and flows into the concentrated washing liquid storage barrel to complete the separation operation.

[0020] In this embodiment: The bottom valve of the solid-liquid mixture transfer barrel is about 0.5 to 2.5 meters higher than the top of the vertical centrifuge. Its function is to receive and store the mixture of titanium liquid and ferrous sulfate heptahydrate crystals generated by freeze crystallization. It is equipped with a low-speed stirring device to keep the solid phase and liquid phase in the mixture uniform. Its bottom outlet is equipped with a manual control valve and an electric control valve. During operation, the manual control valve is fully open, and the electric control valve automatically adjusts the opening according to the set flow rate, feeding the vertical centrifuge at a flow rate between 25 m³ / h and 40 m³ / h, thereby realizing the separation of titanium liquid and ferrous sulfate heptahydrate crystals.

[0021] The feed inlet of the vertical centrifuge is opened at the center of the top of the machine body and is connected to the feed pipe of the solid-liquid mixture transfer barrel. The washing liquid supply interface is on the side of the top of the machine body. The discharge port of the ferrous sulfate heptahydrate crystals is connected above the ferrous aggregate hopper, and the liquid-phase outlet is arranged beside the lower side of the machine body; The mixture of the fed titanium liquid and ferrous sulfate heptahydrate crystals is separated and washed by this centrifuge to produce liquid-phase titanium liquid and solid-phase ferrous sulfate heptahydrate crystals; The liquid-phase titanium liquid flows into the titanium liquid storage barrel for processing in the next station, and the solid-phase ferrous sulfate heptahydrate crystals fall into the ferrous aggregate hopper for further processing.

[0022] The upper conical opening of the ferrous aggregate hopper is closely connected to the discharge opening of the ferrous sulfate crystal of the vertical centrifuge, and its lower conical opening is connected to the feed opening of the humidifying and mixing conveyor; its function is to store a small amount of heptahydrate ferrous sulfate crystals falling from the discharge opening of the ferrous sulfate crystal of the vertical centrifuge, and then evenly supply materials to the humidifying and mixing conveyor.

[0023] The feed opening of the humidifying and mixing conveyor is closely connected to the lower conical opening of the ferrous aggregate hopper, and its discharge opening is connected to the feed opening of the ferrous spiral feeder. There is also a light washing liquid inlet beside its feed opening; the function of this humidifying and mixing conveyor is to fully mix the heptahydrate ferrous sulfate separated from the vertical centrifuge and the proportionally input light washing liquid to enhance the penetration washing effect of the light washing liquid on the residual titanium carried by the heptahydrate ferrous sulfate.

[0024] The feed opening of the ferrous spiral feeder is connected to the discharge opening of the humidifying and mixing conveyor, and its discharge is directly sent into the drum of the horizontal pusher centrifuge; its function is to evenly send the mixed materials mixed by the humidifying and mixing conveyor into the horizontal pusher centrifuge for liquid separation, and then carry out cold clean water washing and drying.

[0025] The horizontal pusher centrifuge receives the mixed materials sent from the ferrous spiral feeder. The mixed materials first carry out centrifugal liquid separation in the first-stage drum, then are pushed to the second-stage drum for cold clean water washing and liquid separation, and finally enter the third-stage drum for thorough liquid separation and drying; through the liquid separation to washing and liquid separation to liquid separation and drying in this three-stage drum, the residual titanium content of the separated heptahydrate ferrous sulfate is reduced to less than 0.18%, significantly improving the quality of the by-product heptahydrate ferrous sulfate and the recovery rate of the main product titanium dioxide.

[0026] The feed opening of the ferrous spiral discharge machine is connected to the discharge opening of the heptahydrate ferrous sulfate crystal of the horizontal pusher centrifuge, and its discharge opening is connected to the upper part of the yard of the heptahydrate ferrous sulfate product; its function is to transport the heptahydrate ferrous sulfate crystals washed, separated, dehydrated and dried by the horizontal pusher centrifuge to the yard for stacking and waiting for sale.

[0027] The titanium liquid storage barrel is used to receive and store the titanium liquid separated from the vertical centrifuge, and it is installed at a position where the barrel mouth is 0.5 meters to 3 meters lower than the liquid discharge opening of the vertical centrifuge.

[0028] The light washing liquid storage barrel is used to collect and store the washing liquid generated by the washing and separation of the second-stage drum and the third-stage drum of the horizontal pusher centrifuge. Its barrel mouth is between 0.5 meters and 1.5 meters lower than the light washing liquid discharge opening of the horizontal pusher centrifuge. The light washing liquid generated by the washing and separation of the horizontal pusher centrifuge flows into the light washing liquid storage barrel by gravity, and then is sent to the humidifying and mixing conveyor by the light washing liquid transfer pump in proportion for secondary mixing and washing of the heptahydrate ferrous sulfate.

[0029] The concentrated washing liquid storage barrel is used to collect and store the concentrated washing liquid generated by the dehydration separation of the first-stage drum of the horizontal pusher centrifuge. The barrel mouth is 0.5 to 1.5 meters lower than the concentrated washing liquid discharge port of the horizontal pusher centrifuge. The concentrated washing liquid generated by the dehydration separation of the horizontal pusher centrifuge flows into the concentrated washing liquid storage barrel by gravity, and then is sent back to the vertical centrifuge by the concentrated washing liquid transfer pump in proportion to wash the ferrous sulfate heptahydrate separated by it.

[0030] The dilute washing liquid transfer pump is a frequency modulation variable speed pump. Its tail end is connected to the bottom valve of the dilute washing liquid storage barrel. Its function is to send the dilute washing liquid to the humidifying and mixing conveyor for secondary mixing and washing of ferrous sulfate heptahydrate.

[0031] The concentrated washing liquid transfer pump is a frequency modulation variable speed pump. Its tail end is connected to the bottom valve of the concentrated washing liquid storage barrel. Its function is to send the concentrated washing liquid back to the vertical centrifuge to wash the ferrous sulfate separated by the vertical centrifuge. When this part of the liquid with a lower titanium concentration washes the ferrous in the vertical centrifuge, not only the ferrous is initially washed and the titanium content in the ferrous is initially reduced, but also the titanium concentration of this part of the washing liquid is increased during the washing, and it can be directly mixed into the mother liquor, significantly improving the primary recovery rate of this station.

[0032] The titanium liquid transfer pump has its tail end connected to the bottom valve of the titanium liquid storage barrel. Its function is to send the titanium liquid to the fine filtration station for processing.

[0033] Example 2: Brief description of specific comparative examples and examples: In the comparative example, a currently common vacuum disc filter and a horizontal pusher centrifuge are used to separate and wash the mixture of ferrous sulfate and titanium liquid. The TiO 2 concentration in the titanium liquid of the mixture is 175 g / L, and the volume ratio of the liquid-phase titanium liquid to the solid-phase ferrous sulfate heptahydrate crystal is 71:29. The mixture first enters the vacuum disc filter for separation and washing. Its feeding and separation washing are continuous, and the washing is also carried out with low-degree water containing about 18 g / L of titanium generated from other stations. After the washing liquid washes the ferrous sulfate, it is directly mixed into the separated titanium liquid to become the product transferred to the next station; the concentration of the titanium liquid obtained after separation is 159 g / L, the ferrous sulfate contains 16% free liquid phase and 0.86% titanium; the titanium liquid separated by the vacuum disc filter is sent to the fine filtration station for processing, and the obtained ferrous sulfate is sent to the horizontal centrifuge for washing and dehydration. The ferrous sulfate washed and dehydrated by the horizontal centrifuge contains 5% free liquid phase and 0.35% titanium; Embodiment of the present invention: The seven-hydrate ferrous sulfate separation and washing process is adopted. The core part is to use a vertical centrifuge to replace the vacuum disc filter in the existing process. In addition, a humidifying and mixing conveyor is added before the feeding of the horizontal pusher centrifuge. Moreover, the horizontal pusher centrifuge is a new type of centrifuge with an upgraded three-stage drum and two outlets for concentrated and dilute washing liquid. The new process formed by innovation and optimization has a TiO 2 concentration of 175 g / L in the titanium solution of the mixture, and the volume ratio of the liquid-phase titanium solution to the solid-phase seven-hydrate ferrous sulfate crystal is 71:29. The mixture first enters the vertical centrifuge for separation and washing, and its feeding, separation, and washing are carried out continuously. The washing liquid is the concentrated washing liquid containing 60 g / L of titanium generated by the horizontal centrifuge. After washing the ferrous sulfate, the washing liquid is directly mixed into the separated titanium solution to become the product transferred to the next station; the concentration of the titanium solution obtained after separation is 171 g / L, the ferrous sulfate contains 6% free liquid phase and 0.73% titanium; the titanium solution separated by the vertical centrifuge is sent to the fine filtration station for processing, and the obtained ferrous sulfate is sent to the humidifying and mixing conveyor to be fully mixed with the dilute washing liquid containing 26 g / L of titanium generated by the horizontal centrifuge sprayed in, and then sent to the horizontal centrifuge for washing and drying. In this way, the ferrous sulfate washed and dried by the horizontal centrifuge contains 4% free liquid phase and 0.15% titanium; The data comparison between the comparative example and the embodiment is shown in the following table:

[0034] Example 3: Such as Figures 2 to 10As shown in the figure, the present invention also discloses a vertical centrifuge 2, comprising: a centrifugal cylinder 14, a separation assembly, a feeding assembly, and a centrifugal assembly. The centrifugal cylinder 14 is used to accommodate the mixture of titanium liquid and ferrous sulfate heptahydrate crystals. The separation assembly is connected to the inner side of the centrifugal cylinder 14 and includes: a hollow disk 18, a support ring 19, a diversion groove 39, and a diversion pipe 40. The hollow disk 18 is used to install the centrifugal assembly and can drive the centrifugal assembly to rotate. The diversion groove 39 is connected to the inner side of the support ring 19. The diversion groove 39 is arranged in a ring shape. The diversion groove 39 is fixedly connected to the inner side of the support ring 19 through two connecting blocks, and the top of the diversion groove 39 is close to the bottom of the hollow disk 18 for collecting titanium liquid. The diversion pipe 40 is connected between the diversion groove 39 and the support ring 19. One end of the diversion pipe 40 close to the support ring 19 is inclined downward for guiding the titanium liquid to the outer region of the support ring 19. The hollow disk 18 is rotatably installed on the top of the support ring 19, and the edge of the hollow disk 18 is smoothly connected to the outer side of the support ring 19. A power assembly for driving the hollow disk 18 to rotate is installed at the bottom of the hollow disk 18. The power assembly includes: a second driving member 35, a transmission 36, and a transmission member 37. The second driving member 35 is arranged outside the centrifugal cylinder 14, and the second driving member 35 can be a motor. The transmission 36 is connected to the bottom of the hollow disk 18, and the output shaft of the transmission 36 is drivingly connected to the center of the bottom of the hollow disk 18 for cooperating with the second driving member 35 to adjust the rotation speed of the hollow disk 18. The transmission member 37 is connected between the transmission 36 and the second driving member 35. The transmission member 37 can be a belt or a chain. The transmission member 37 is drivingly connected between the output shaft of the second driving member 35 and the input shaft of the transmission 36 for transmitting the power of the second driving member 35 to the transmission 36. A through hole for inserting the transmission member 37 is formed through the centrifugal cylinder 14. The second driving member 35 and the centrifugal cover 26 are installed on the same fixed base 38. The support ring 19 is connected between the centrifugal cylinder 14 and the hollow disk 18. The support ring 19 is in an overall conical shape, and the diameter of the support ring 19 gradually increases from top to bottom. The bottom edge of the support ring 19 is fixedly connected to the inner wall of the centrifugal cylinder 14. The region formed between the outer side of the support ring 19 and the inner side of the centrifugal cylinder 14 can be used for guiding the flow of water. The feeding assembly is installed at the feeding port of the centrifugal cylinder 14 for screening and conveying the mixture. The centrifugal assembly is used for centrifuging the mixture.The centrifugal assembly includes a fine centrifugal device, which includes a centrifugal cone 15, a first paddle 16, a first centrifugal net 17, and a coarse centrifugal device sleeved on the outside of the first centrifugal net 17. The first paddle 16 is connected to the surface of the centrifugal cone 15. There are multiple first paddles 16, and the multiple first paddles 16 are evenly distributed in an annular manner on the surface of the centrifugal cone 15. The first paddle 16 is fixedly connected to the surface of the centrifugal cone 15 by welding or integral turning. The first paddle 16 is spiral in shape as a whole, and the side of the first paddle 16 away from the centrifugal cone 15 is close to the inner wall of the first centrifugal net 17. The centrifugal cone 15, the first centrifugal net 17, and the coarse centrifugal device are all installed on the separation assembly. The centrifugal cone 15 is fixedly connected to the top of the separation assembly, and the first centrifugal net 17 is rotatably connected to the top of the hollow disk 18. The centrifugal cone 15 and the first centrifugal net 17 can cooperate with the first paddle 16 to realize the centrifugal operation of the fine mixture; Since only one layer of centrifugal mesh is generally provided inside the existing vertical centrifuge 2, when the mixed material is added into the vertical centrifuge 2 through the feeding port of the vertical centrifuge 2, all the mixed materials can only complete the centrifugal operation under the action of the single-layer centrifugal mesh and the centrifugal cone 15. However, due to the difference in the particle size of the mixed materials, the centrifugal effect is generally poor. In order to solve this problem, the present embodiment is provided with a coarse centrifugal device and a fine centrifugal device. Before the mixed material of the titanium liquid and the ferrous sulfate heptahydrate crystals is put into the centrifugal barrel 14, the second driving member 35 is started to The centrifugal cone 15 and the coarse centrifugal device are driven to rotate. When the rotation speeds of the centrifugal cone 15 and the coarse centrifugal device are stable, the mixture is fed into the feeding assembly, which then screens the mixture and conveys the coarse mixture to the coarse centrifugal device, and conveys the fine mixture to the area between the centrifugal cone 15 and the first centrifugal net 17, so that the fine mixture can be evenly laid on the inner side of the first centrifugal net 17 under the action of the first paddle 16 on the surface of the centrifugal cone 15, and the fine mixture can be centrifuged under the action of centrifugal force; Since the centrifugal force on the mixture is proportional to its centrifugal radius under the same angular velocity and mass, the coarse centrifugal device mounted on the outside of the first centrifugal net 17 can generate a greater centrifugal force on the coarse mixture driven by the hollow disk 18, thereby improving the centrifugal effect on the coarse mixture, and at the same time, the titanium content of the ferrous sulfate heptahydrate crystals is reduced as a whole, thereby improving the centrifugal effect on the ferrous sulfate heptahydrate crystal mixture; After the centrifugation operation of the mixture is completed by the coarse centrifugation device and the fine centrifugation device for the coarse mixture and the fine mixture respectively, the titanium liquid separated from the coarse mixture can directly flow into the outer area of the support ring 19, while the titanium liquid separated from the fine mixture can flow into the diversion groove 39. Subsequently, this part of the titanium liquid can flow into the outer area of the support ring 19 through the diversion pipe 40 and finally flow out of the centrifugation cylinder 14 through the liquid mixture discharge port connected to the side of the centrifugation cylinder 14. The centrifuged ferrous sulfate heptahydrate crystals can pass through the hollowed-out disk 18 under the action of gravity and enter the humidifying and mixing conveyor 4 in the next process.

[0035] As Figures 2 to 9 shown, in order to improve the centrifugation effect of ferrous sulfate heptahydrate crystals and avoid blockage of the ferrous sulfate heptahydrate crystals at the feed hopper 20 during the process of adding them to the centrifugation cylinder 14, the feeding assembly includes: a feed hopper 20, a screening cover 21, an annular baffle 22, a screw blade 23, and a first driving member 24. The feed hopper 20 is used to guide the mixture into the centrifugation cylinder 14. The feed hopper 20 is fixedly inserted at the feed port of the centrifugation cylinder 14. The top opening of the feed hopper 20 is designed as a wide mouth. The screening cover 21 is used to screen the mixture. The screening cover 21 is overall conical, and the diameter of the screening cover 21 gradually increases from top to bottom. The filtering diameter of the screening cover 21 is between the filtering diameter of the first centrifugal screen 17 and the filtering diameter of the coarse centrifugation device. The screening cover 21 is fixedly sleeved on the top of the first centrifugal screen 17; the annular baffle 22 is sleeved outside the screening cover 21. The annular baffle 22 is overall conical, and the diameter of the annular baffle 22 gradually increases from top to bottom. The inner side of the annular baffle 22 is close to the screw blade 23 and is used to restrict the mixture. The top of the annular baffle 22 is smoothly connected to the bottom of the feed hopper 20; the screw blade 23 is connected to the surface of the screening cover 21 and can cooperate with the annular baffle 22 to realize the downward guidance of the mixture. The screw blade 23 is fixedly connected to the surface of the screening cover 21; The first driving member 24 is connected to the top of the screening cover 21 and is used to drive the screening cover 21 and the screw blade 23 to rotate in the opposite direction to the centrifugal cone 15 to realize the guiding and screening of the mixture. The first driving member 24 can be a motor. A protective assembly for shielding the mixture is provided at the top of the first driving member 24. The protective assembly includes: a protective cone 25. The protective cone 25 is fixedly connected to the inner side of the feed hopper 20 through a plurality of connecting rods and is used to fix the first driving member 24. The tip of the protective cone 25 faces upward, and the bottom of the protective cone 25 is rotatably sleeved on the top of the screening cover 21. An installation groove is provided at the bottom of the protective cone 25, and the first driving member 24 is fixed in the installation groove; When the mixture of ferrous sulfate heptahydrate crystals is added to the feed hopper 20, as the first driving member 24 drives the screening cover 21 to rotate, the auger blades 23 connected to the surface of the screening cover 21 can actively convey the mixture accumulated at the feed hopper 20 downward in cooperation with the annular enclosure 22, thereby effectively avoiding blockage of the mixture in the feed hopper 20; During the downward movement of the mixture, due to the presence of the screening cover 21, the screening cover 21 can screen the mixture according to different particle sizes. The mixture smaller than the screening diameter of the screening cover 21 can enter the area between the first centrifugal screen 17 and the centrifugal cone 15, while the mixture larger than the screening diameter of the screening cover 21 can enter the coarse centrifugal device, so that the vertical centrifuge 2 in the present invention can apply different centrifugal forces to the mixture according to different particle sizes of the mixture, thereby improving the centrifugal effect on the mixture.

[0036] As Figures 3 to 5 shown, in order to improve the centrifugal effect on the coarse particle size mixture, a coarse centrifugal device with a larger centrifugal diameter is arranged outside the first centrifugal screen 17. The coarse centrifugal device includes: a centrifugal cover 26, a second centrifugal screen 27, second paddles 28, and a material guiding cover 29. The centrifugal cover 26 is sleeved outside the first centrifugal screen 17. The centrifugal cover 26 is fixedly connected to the top of the hollowed-out disk 18, and the top of the centrifugal cover 26 is rotationally inserted into the bottom of the annular enclosure 22. The annular gap between the centrifugal cover 26 and the first centrifugal screen 17 is located directly above the diversion groove 39, and the titanium liquid flowing out from between the centrifugal cover 26 and the first centrifugal screen 17 can just completely flow into the diversion groove 39 to be collected, which is used to separate the fine mixture and the coarse mixture; the second centrifugal screen 27 is sleeved outside the centrifugal cover 26, and the filtering diameter of the second centrifugal screen 27 is the same as the filtering diameter of the first centrifugal screen 17; the second paddles 28 are connected to the outside of the centrifugal cover 26. The number of the second paddles 28 is multiple, and the multiple second paddles 28 are evenly distributed in a ring on the surface of the centrifugal cover 26. The second paddles 28 are fixedly connected to the surface of the centrifugal cone 15 by welding or integral turning. The second paddles 28 are in a spiral shape as a whole, and the side of the second paddles 28 away from the centrifugal cover 26 is close to the inner wall of the second centrifugal screen 27, and the second paddles 28 can cooperate with the centrifugal cover 26 and the second centrifugal screen 27 to perform centrifugal operation on the coarse mixture under the action of the power assembly; the material guiding cover 29 is connected to the second centrifugal screen 27 and is used to limit and guide the coarse mixture. The material guiding cover 29 is in a conical shape as a whole, and the diameter of the material guiding cover 29 decreases from top to bottom. The top edge of the material guiding cover 29 is fixedly connected to the inner wall of the centrifugal cylinder 14; After the mixture is screened by the screening cover 21, the coarse mixture with larger particle size can be intercepted by the screening cover 21 and fall into the material guiding cover 29 under the conveying action of the auger blade 23. Subsequently, the coarse mixture can enter the area between the second centrifugal screen 27 and the centrifugal cover 26 under the guidance of the material guiding cover 29. As the hollow disk 18 drives the centrifugal cover 26 to rotate, the second paddle 28 on the outer side of the centrifugal cover 26 can evenly lay the coarse mixture on the inner side of the second centrifugal screen 27. Since the second centrifugal screen 27 has a larger centrifugal radius than the first centrifugal screen 17, the coarse mixture laid on the inner wall of the second centrifugal screen 27 can obtain a greater centrifugal force, so that the coarse mixture can perform centrifugal operation under the action of a greater centrifugal force, thereby improving the centrifugal effect on the ferrous sulfate heptahydrate crystal mixture.

[0037] As Figure 4 , Figure 5 and Figure 8 shown, in order to enable the mixture to be more smoothly separated by the screening cover 21 and reduce the probability of the mixture adhering to the screening cover 21, a vibration assembly for driving the screening cover 21 to vibrate is provided inside the screening cover 21. The vibration assembly includes: a vibration rod 30, a fixed pipe 31, an elastic member 32, a ball 33, and an annular tooth groove 34. The vibration rod 30 is used to transfer the vibration generated by the centrifugal cone 15 to the screening cover 21; the fixed pipe 31 is connected to the inner wall of the screening cover 21 and is used to install the vibration rod 30. The number of fixed pipes 31 is multiple, and the fixed pipes 31 are fixedly connected to the inner wall of the screening cover 21 and are evenly distributed in a ring shape inside the screening cover 21. The vibration rod 30 is slidably inserted into the fixed pipe 31; the elastic member 32 is located inside the fixed pipe 31 and can press the vibration rod 30 against the surface of the centrifugal cone 15. The elastic member 32 can be a spring; the ball 33 is connected to the end of the vibration rod 30. The ball 33 is rotatably installed at the end of the vibration rod 30 away from the elastic member 32, and is used to reduce the friction between the vibration rod 30 and the centrifugal cone 15 when the vibration rod 30 moves along the surface of the centrifugal cone 15; the annular tooth groove 34 is opened on the surface of the centrifugal cone 15. When the ball 33 moves along the annular tooth groove 34, the ball 33 can cooperate with the annular tooth groove 34 to generate vibration. When the centrifugal cone 15 rotates driven by the power assembly, the screening cover 21 can also rotate slowly in the opposite direction to the centrifugal cone 15 driven by the first driving member 24. During this process, the balls 33 on the vibrating rod 30 can roll along the annular tooth grooves 34 on the surface of the centrifugal cone 15 under the pressure of the elastic member 32. At this time, the vibration generated by the collision of the balls 33 and the annular tooth grooves 34 can be transmitted to the screening cover 21 through the vibrating rod 30 and the fixed pipe 31 in sequence. Thus, when the mixture contacts the surface of the screening cover 21, the vibration can more quickly make the mixture with a smaller particle size pass through the screening cover 21 and enter the fine centrifugal device, while the mixture with a larger diameter can enter the coarse centrifugal device along the surface of the screening cover 21, improving the screening effect of the screening cover 21 on mixtures with different particle sizes; In addition, when the final mixture enters the centrifugal cylinder 14, the vibration generated by the cooperation of the vibrating rod 30 and the annular tooth grooves 34 can make the mixture remaining on the screening cover 21 separate from the screening cover 21 more easily, thereby reducing the probability of the mixture remaining on the screening cover 21.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. A ferrous sulfate heptahydrate separation and washing process, characterized in that: include: A solid-liquid mixture transfer barrel (1), a vertical centrifuge (2), a ferrous collecting hopper (3), a humidifying mixing conveyor (4), a ferrous screw feeder (5), a horizontal pusher centrifuge (6), a ferrous screw discharger (7), a titanium liquid storage barrel (8), a dilute washing liquid storage barrel (9), a concentrated washing liquid storage barrel (10), a dilute washing liquid delivery pump (11), a concentrated washing liquid delivery pump (12), and a titanium liquid delivery pump (13). The ferrous sulfate heptahydrate separation and washing process comprises the following steps: Step 1: The mixture of titanium liquid and ferrous sulfate heptahydrate crystals obtained by freezing is fed into a solid-liquid mixture transfer barrel (1). When the liquid level reaches 50% to 80% of the barrel capacity, the ferrous screw conveyor, the horizontal pusher centrifuge (6), the ferrous screw feeder (5), the humidifying mixing conveyor (4), and the vertical centrifuge (2) are respectively started, and then the solid-liquid mixture is conveyed to the vertical centrifuge (2). At this time, the mixture of titanium liquid and ferrous sulfate heptahydrate crystals is continued to be fed into the solid-liquid mixture transfer barrel (1) to keep the input and output balanced, and the liquid level of the solid-liquid mixture transfer barrel (1) is always maintained between 50% and 80%; Step 2: starting the concentrated washing liquid delivery pump (12), the flow rate of which can be automatically adjusted according to the working current of the vertical centrifuge (2), so that the concentrated washing liquid containing 55 to 65 g / L of titanium can be input at a ratio of 4% to 7% of the amount of the solid-liquid mixture entering the vertical centrifuge (2) to perform preliminary washing on the ferrous sulfate heptahydrate crystals separated by the vertical centrifuge (2), and the washing liquid after washing is directly mixed into the titanium liquid for recycling; Step 3: Start the light washing liquid delivery pump (11), and the flow rate of the light washing liquid can be automatically adjusted according to the working current of the vertical centrifuge (2) so that the light washing liquid containing titanium of 18 to 28 g / L can be evenly sprayed into the humidifying mixing conveyor (4) at a ratio of 10% to 20% of the mass of the ferrous sulfate heptahydrate entering the humidifying mixing conveyor (4), and the light washing liquid containing titanium of 18 to 28 g / L is fully infiltrated and mixed with the ferrous sulfate heptahydrate crystals entering at the same time, and then the mixed material enters the ferrous sulfate screw feeder (5), and the ferrous sulfate screw feeder (5) evenly feeds the mixed material into the horizontal pusher centrifuge (6) for separation, washing and drying; Step 4: washing cold water is uniformly input into the horizontal pusher centrifuge (6) at a ratio of 12% to 23% of the mass of the ferrous sulfate heptahydrate entering the horizontal pusher centrifuge (6). The mixed material entering the horizontal pusher centrifuge (6) contains 17% to 30% of the free liquid phase. It is first dried in the first stage drum, and the free liquid phase content is reduced to 4% to 6%. It is then pushed by the piston to the second stage drum for cold water washing and separation, and finally pushed by the piston to the third stage drum for dehydration and drying. The ferrous sulfate crystals dehydrated and dried by the third stage drum contain a free liquid phase content reduced to 3% to 5%, and titanium 0.1% to 0.18%. The ferrous sulfate crystals are finally discharged from the solid phase discharge port of the horizontal pusher centrifuge (6), the light washing liquid is discharged from the light liquid phase discharge port and flows into the light washing liquid storage tank (9), and the concentrated washing liquid is discharged from the concentrated liquid phase discharge port and flows into the concentrated washing liquid storage tank (10), completing the separation operation.

2. A vertical centrifuge for performing the ferrous sulfate heptahydrate separation and washing process as claimed in claim 1, characterized in that: include: A centrifugal cylinder (14) for containing a mixture of titanium liquid and ferrous sulfate heptahydrate crystals; A separation component connected to the inner side of the centrifugal cylinder (14); A feeding assembly, installed at the feeding port of the centrifugal cylinder (14), and used for screening and conveying the mixed material; A centrifugal assembly, used for centrifuging the mixture; The centrifugal assembly comprises a fine centrifugal device, the fine centrifugal device comprising a centrifugal cone (15), a first paddle (16), a first centrifugal net (17) and a coarse centrifugal device sleeved on the outside of the first centrifugal net (17), the first paddle (16) being connected to the surface of the centrifugal cone (15), the centrifugal cone (15), the first centrifugal net (17) and the coarse centrifugal device are all mounted on the separation assembly, and the centrifugal cone (15) and the first centrifugal net (17) can cooperate with the first paddle (16) to realize a centrifugal operation on the fine mixed material.

3. The vertical centrifuge according to claim 2, characterized in that: The separation component comprises: A hollow plate (18) is used to mount the centrifugal assembly and can drive the centrifugal assembly to rotate, and a power assembly that drives the hollow plate (18) to rotate is installed at the bottom of the hollow plate (18); A support ring (19) connected between the centrifugal cylinder (14) and the hollow disk (18), wherein the area formed between the outer side of the support ring (19) and the inner side of the centrifugal cylinder (14) can be used to guide water flow; A guide groove (39) connected to the inner side of the support ring (19) and used for collecting titanium liquid; A guide pipe (40) is connected between the guide groove (39) and the support ring (19) and is used to guide the titanium liquid to the outer area of ​​the support ring (19).

4. The vertical centrifuge according to claim 3, characterized in that: The feed assembly comprises: The feed hopper (20) is used to guide the mixed material into the centrifugal drum (14). A screening hood (21) for screening the mixed material; An annular enclosure plate (22) is sleeved on the outside of the screening cover (21) and is used to restrict the mixed material; An auger blade (23) is connected to the surface of the screening cover (21) and can cooperate with the annular enclosure plate (22) to guide the mixed material downward; A first driving member (24) is connected to the top of the screening cover (21) and is used to drive the screening cover (21) and the auger blades (23) to rotate in the opposite direction to the centrifugal cone (15) to achieve guided screening of the mixed material. A protective component for shielding the mixed material is provided on the top of the first driving member (24).

5. The vertical centrifuge according to claim 4, characterized in that: The protection component comprises: A protective cone (25) is connected to the inner side of the feed hopper (20) and is used to fix the first driving member (24).

6. The vertical centrifuge according to claim 5, characterized in that: The crude centrifugal device comprises: A centrifugal cover (26) is sleeved on the outside of the first centrifugal net (17) and is used to separate the fine mixed material from the coarse mixed material; A second centrifugal net (27) is sleeved on the outside of the centrifugal cover (26); A second paddle (28) is connected to the outside of the centrifugal cover (26), and the second paddle (28) can cooperate with the centrifugal cover (26) and the second centrifugal net (27) under the action of the power assembly to achieve a centrifugal operation on the coarse mixed material; The material guide cover (29) is connected to the second centrifugal screen (27) and is used to limit and guide the coarse mixed material.

7. The vertical centrifuge according to claim 6, characterized in that: A vibration component is arranged inside the screening cover (21) to drive the screening cover (21) to vibrate, and the vibration component comprises: A vibration rod (30) for transmitting the vibration generated by the centrifugal cone (15) to the screening cover (21); A fixing pipe (31) connected to the inner wall of the screening cover (21) and used for mounting the vibration rod (30); An elastic member (32) is located inside the fixed tube (31) and is capable of pressing the vibration rod (30) against the surface of the centrifugal cone (15); a ball (33) connected to the end of the vibration rod (30) and used to reduce the friction between the vibration rod (30) and the centrifugal cone (15) when the vibration rod (30) moves along the surface of the centrifugal cone (15); An annular tooth groove (34) is provided on the surface of the centrifugal cone (15); when the ball (33) moves along the annular tooth groove (34), the ball (33) can cooperate with the annular tooth groove (34) to generate vibration.

8. The vertical centrifuge according to claim 7, characterized in that: The power assembly comprises: A second driving member (35) is arranged outside the centrifugal cylinder (14); A transmission (36), connected to the bottom of the hollow disk (18), and used to cooperate with the second driving member (35) to adjust the rotation speed of the hollow disk (18); A transmission member (37) is connected between the transmission (36) and the second driving member (35) and is used to transmit power of the second driving member (35) to the transmission (36); and a through hole for inserting the transmission member (37) is formed through the centrifugal cylinder (14).

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