The application of disc vacuum filter made in China in the production of titanium dioxide

Inorganic salt industrial chemical equipment China's production of disc vacuum filter in the production of titanium dioxide Tang Wenbiao (Shandong Provincial Planning and Design Institute of Chemical Industry, Jinan 250013, China) Comparison of the production capacity and energy consumption of imported centrifuges. The results show that the performance of the disc vacuum filter produced in China is equivalent to the introduction of the machine, and it can fully adapt to the production of titanium dioxide, and the equipment and process are analyzed.

1 Equipment Overview 1. Technical data Titanium oxide liquid, material is 00Cr17Ni14Mo2 (Sweden), lined with polypropylene, filter cloth is polypropylene, filter drive is stepless speed regulation, processing capacity is 15~25m3/h, lubrication method For automatic lubrication of the pump, the vacuum consumption is a 0.04 1.2 Working principle The disc vacuum filter is a horizontal circular filter plane, which is divided into 18 fan-shaped filter chambers by dividing the grid into a fan-shaped polypropylene mesh in each filter chamber. In the grid, two layers of polypropylene filter cloth are laid on the surface, and each filter chamber is fixed with a round polypropylene strip. The whole filter is installed on the steel bracket and is integrated with the transmission gearwheel. The motor speed reducer drives the large gear to rotate through the pinion gear, so that the disk vacuum filter is used for horizontal rotary motion.

Below each fan-shaped filter chamber there is a discharge tube which is directly connected to the central distribution valve. The circumference of the valve body is provided with the same hole diameter as the discharge pipe, and rotates with the plate. The upper distribution valve of the central distribution valve communicates. The relative rotation parts of the upper and lower distribution valves are made of imported anti-corrosion and anti-corrosion materials. When they are relatively rotated, they can keep the seals from leaking under the effect of vacuum. According to the requirements of filtration production process, the lower distribution valve has a continuous operation area such as filtration zone, primary washing zone, secondary scrubbing zone, three washing zones, and ferrous sulfate sulphide drainage zone.

On the filter surface of the disc vacuum filter, there is a slurry distributor corresponding to the operation area of ​​the central distribution valve, and the filter slurry is distributed on the filter surface. Under the action of the vacuum, the liquid flows down to the vacuum through the filter cloth. In the filter chamber, the solid forms a dry filter cake on the filter cloth, and the washing solution is uniformly sprayed on the filter cake with a washing spreader to perform washing. The liquids in each zone are not mixed, and the filter cake after filtration and filtration is filtered through the filter. The spiral discharge device on the surface pushes the filter cake from the inner ring to the outer edge and falls into the hopper. The small amount of filter cake remaining on the filter cloth will be redistributed with the slurry from the central distribution valve through the compressed air in the next working cycle.

Production and operation of a titanium dioxide plant in China, ferrous sulfate separation has a Germany-made 2050 centrifuge and a Chinese-made GKH1250-M centrifuge, the lower fixed in the base of the distribution valve on the upper and lower open: Trapezoidal hole and ish two The cost of spare parts for machine-Af repairs was about 490,000 yuan, and 14 m2 disc vacuum filter was used. The feed quantity in production can be stabilized at 16 m3/h, the maximum instantaneous amount of material can reach 21m3/h, and the water intake is 1.4. The mass concentration of m3/h indicator Ti4+ and m(Fe)/m(Ti) can be stabilized within the acceptable range, but because the principle of the suction filtration of the disk is vacuum suction filtration, the moisture content in the ferrous iron reaches about 15%. The class production of 120m3/shift is equivalent to the output of two centrifuges. Disk vacuum filter wearing parts only filter cloth and plastic strips, wrong gas tray, the annual cost of about 30,000 yuan, far lower than the centrifuge maintenance costs, and clearing, maintenance is very convenient. The centrifuge and disc vacuum filter production capacity and energy consumption are summarized in Table 1. Table 1 centrifuge. Disk Vacuum Filter Production Capacity and Energy Consumption Comparison Machine Name Feed Volume/Main Motor/Spiral Motor/Pump Motor/Stirrer Motor/Belt Motor/Pump Motor/Vacuum Motor/Power Consumption Total Annual Operating Expense/10,000 Yuan Imported Centrifugal Machine centrifugal disc vacuum filter China-made Note: The annual operating costs to run in the year 330d. Daily start 19. 2h count, electricity 0 by running also found that the disc vacuum filter will not appear when the liquid is not good shake The phenomenon. The disc vacuum filter has high moisture content (water content of about 15%), main content (634.70 mass fraction) of 83.94%, and loss of 0.36%. Other advantages are better than centrifuge, such as large output, stable operation, Low energy consumption, easy operation and so on. The performance of the disc vacuum filter produced in China is equivalent to the introduction of the machine, and it can completely adapt to the production of titanium dioxide.

Process and equipment analysis 1) should be high layout. The disc vacuum filter (abbreviated as "disc machine") is arranged on the +12.00m plane to ensure smooth liquid discharge. The liquid at the outlet of the disc machine enters the liquid receiving tank, and the liquid receiving tank is arranged at the *0.00m plane. The vertical distance between the disc machine and the receiving tank should be small. When configuring, the liquid pipe between the two should be reduced as much as possible to reduce the pipe resistance. ) Smooth transmission. The rotary part of the disc machine adopts the relative rotation between the rotary disc and the chassis, so there are few rotating parts, and the motor speed reducer rotates through the pinion gear to ensure the smoothness of the rotary disc.

The overall performance of the filter room is good. The filter chamber of the disc machine has a complete annular plate and an inner and an outer baffle forming an integral filter chamber, and the central part is divided into several chambers by a grid strip, and the whole is mounted on the transmission bracket. The structure is an integral filter chamber, there is no seal between the filter chambers and deformation due to thermal expansion.

Helical unloading uses self-protection devices. The disc machine unloading device is flat, stable operation, large unloading capacity, fast unloading speed, small rotation resistance on the filter surface, and also uses a mechanical overload protection device to effectively ensure the safety and continuity of the machine. .

Filter cloth regeneration design. A filter cloth regeneration zone is provided between the exit ferrous area and the feed zone, and the compressed cake is mixed with the filtrate by back blowing with compressed air. This will not only result in the effect of filter cloth regeneration but also will not result in the filtration of residual crystals. .

Special titanium liquid distributor. According to the distribution principle of the center distribution line, the feeding port divided by the size of the filter area is adopted at the feed inlet, so as to effectively ensure the reasonable distribution of the feed.

Vacuum sealed. The wrong gas tray uses UHMW-PE and has a unique structure. After the machine is in normal operation, the vacuum degree can be greater than 0.062 MPa. The washing effect is good. The scrubber is well-arranged, with different structures for one washing, two washing and three washing, so that the washing liquid is sprayed evenly and the amount of water is small, which not only achieves the recovery of the filtrate, but also ensures that the filter cake is less damaged.

The whole machine consumes less power. The production capacity of a disc machine is equivalent to the sum of a imported centrifuge and a Chinese-made centrifuge, and its power consumption is lower than that of a imported centrifuge. With an annual output of 15,000 tons of titanium dioxide production capacity, annual savings of about 400,000 yuan.

Automatic refueling system. In order to reduce unnecessary lubrication, the machine is designed to be refueled with an automatic refueling system. After the machine has been running for a certain period of time, the automatic refueller will automatically start the oil pump to achieve the refueling function and ensure the normal operation of the machine.

Filter material corrosion resistance, resistance, good ventilation. The material is made of polypropylene and used as a special filter cloth grille, which is easy to wash evenly and evenly.

Concluding Remarks The introduction of the titanium dioxide industry equipment to drive 10a has achieved great results in the localization of equipment. Now the disc vacuum filter has successfully been put into production operation, and it has added a new one to the large-scale domestic design of Chinese titanium dioxide plant. member. However, the overall level of installation of Chinese titanium dioxide industry is not high, and it is hoped that more equipment manufacturers will manufacture all kinds of equipment that are urgently needed in the production of titanium dioxide.

Shandong Province. The original design of the Ministry of Chemical Industry. two. The third prize, a member of the national titanium dioxide industry expert group, enjoys special government allowances.

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