Device for increasing recovery concentration of sulfuric acid process titanium dioxide waste acid
By designing a device that does not use flocculants and using natural settlement and precision filtration technology, the problems of reduced concentration and increased energy consumption in the waste acid recycling process in the sulfuric acid titanium dioxide production are solved, and the waste acid concentration and production cost are increased.
Patent Information
- Application Number
- CN202420758180.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-12
AI Technical Summary
In the existing sulfuric acid titanium dioxide production process, flocculants need to be added during the waste acid recycling process, resulting in a decrease in waste acid concentration, an increase in energy consumption and a high recycling cost.
A device without flocculant was designed, including a natural settlement tank, a waste acid pump, a precision waste acid filter, a titanium dioxide material recovery tank and a waste acid recovery tank, which increased the concentration of waste acid through natural settlement and precision filtration.
It effectively increases the concentration of waste acid by 1-2%, reduces production costs and energy recycling, and improves the utilization efficiency of waste acid.
Smart Images
Figure CN222605703U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of titanium dioxide production by sulfuric acid process, in particular to a device for improving the recovery concentration of waste acid of titanium dioxide produced by sulfuric acid process. Background Art
[0002] In the production process of titanium dioxide produced by sulfuric acid method, titanium liquid is hydrolyzed to form a mixture of metatitanic acid slurry and about 24% dilute sulfuric acid. Generally, filter press and leaf filter are used for solid-liquid separation. In the separation process, fine particles inevitably pass through the filter cloth and enter the dilute sulfuric acid (waste acid). In order to recover the titanium dioxide material in the waste acid and remove impurities from the waste acid, most titanium dioxide enterprises use the process of adding flocculants to flocculate the fine particles, and recover the materials through single-stage (or multi-stage) natural sedimentation. The unrecovered part is further flocculated by adding flocculants again, and then filtered and recovered by low-precision filtering equipment (such as CN filter), which meets the requirements for waste acid recovery. In this process, the addition of flocculants brings in a large amount of water, and the waste acid concentration is reduced by 1-2% on the original basis. At the same time, due to the addition of flocculants, high-precision filtering equipment is easy to be blocked, and only low-precision equipment can be used, resulting in a high solid content of titanium dioxide in the waste acid.
[0003] The existing waste acid material recovery and impurity removal processes have increased the difficulty of subsequent waste acid recycling. First, the volume of waste acid recovery has increased and the solid content of titanium dioxide is relatively high, which increases the difficulty of utilization. Secondly, companies that use waste acid concentration for recycling have increased the amount of concentrated evaporation, resulting in increased energy consumption and increased recovery costs. Summary of the invention
[0004] In view of the above problems, the purpose of the utility model is to provide a device for improving the recovery concentration of waste acid from titanium dioxide produced by the sulfuric acid process, which can increase the concentration of the recovered waste acid by 1-2% without using a flocculant, thereby effectively saving production costs and recovery energy consumption.
[0005] The technical solution adopted by the utility model is as follows:
[0006] The utility model proposes a device for improving the recovery concentration of waste acid of titanium dioxide produced by sulfuric acid process, comprising a natural sedimentation tank, a waste acid pump, a precision waste acid filter, a titanium dioxide material recovery tank and a waste acid recovery tank; the precision waste acid filter is arranged on one side of the natural sedimentation tank; the middle liquid outlet side of the natural sedimentation tank and the middle feed side of the precision waste acid filter are connected through the waste acid pump; the titanium dioxide material recovery tank and the waste acid recovery tank are respectively arranged below the natural sedimentation tank and the precision waste acid filter; the top liquid outlet side of the precision waste acid filter is connected to the waste acid recovery tank; the bottom ends of the natural sedimentation tank and the precision waste acid filter are respectively connected to the titanium dioxide material recovery tank.
[0007] Furthermore, the solid content of the clear liquid after filtering by the precision waste acid filter is less than 20 ppm.
[0008] Compared with the prior art, the utility model has the following beneficial effects:
[0009] The utility model can ensure that in the production of titanium dioxide by the sulfuric acid process, no flocculant is used in the process of recovering waste acid, which can effectively save production costs; at the same time, it can effectively increase the concentration of the recovered waste acid by 1-2%, and the solid content after high-precision filtration of the waste acid is less than 20ppm, which can effectively reduce the utilization cost and difficulty in the subsequent waste acid utilization process. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0011] Among them, the figure markings are: 1-natural sedimentation tank; 2-waste acid pump; 3-precision waste acid filter; 4-titanium dioxide material recovery tank; 5-waste acid recovery tank. DETAILED DESCRIPTION
[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0013] See attached Figure 1 The utility model proposes a device for improving the recovery concentration of waste acid of titanium dioxide produced by sulfuric acid process, comprising a natural sedimentation tank 1, a waste acid pump 2, a precision waste acid filter 3, a titanium dioxide material recovery tank 4 and a waste acid recovery tank 5. The precision waste acid filter 3 is arranged on the right side of the natural sedimentation tank; the liquid outlet side in the middle of the natural sedimentation tank 1 is connected to the feed side in the middle of the precision waste acid filter 3 through the waste acid pump 2; the titanium dioxide material recovery tank 4 and the waste acid recovery tank 5 are arranged below the natural sedimentation tank 1 and the precision waste acid filter 3, respectively; the liquid outlet side at the top of the precision waste acid filter 3 is connected downward to the top of the waste acid recovery tank 5; the bottom ends of the natural sedimentation tank 1 and the precision waste acid filter 3 are respectively connected downward to the top of the titanium dioxide material recovery tank 1.
[0014] The original titanium dioxide waste sulfuric acid after solid-liquid separation directly enters the natural sedimentation tank 1. After single-stage or multi-stage gravity sedimentation, the titanium dioxide material settled at the bottom enters the titanium dioxide material recovery tank 4 and returns to the system, and the clear liquid is directly pumped into the waste acid precision filter 3 through the waste acid pump 2. After being filtered by the waste acid precision filter 3, the bottom material directly enters the titanium dioxide material recovery tank 4 and returns to the system, and the filtered clear liquid (solid content less than 20ppm) directly enters the waste acid recovery tank 5 and enters the waste acid recovery system; no other materials need to be added during the entire recovery process, and the original waste acid concentration is maintained; at the same time, the precision filter has a high filtration accuracy, and the solid content of the clear liquid after filtration can be controlled below 20ppm.
[0015] Matters not described in detail in this utility model are known technologies.
[0016] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.
Claims
1. A device for increasing the recovery concentration of waste acid from titanium dioxide produced by sulfuric acid process, characterized in that: The device includes a natural sedimentation tank, a waste acid pump, a precision waste acid filter, a titanium dioxide material recovery tank and a waste acid recovery tank; the precision waste acid filter is arranged on one side of the natural sedimentation tank; the middle liquid outlet side of the natural sedimentation tank and the middle feed side of the precision waste acid filter are connected through the waste acid pump; the titanium dioxide material recovery tank and the waste acid recovery tank are respectively arranged below the natural sedimentation tank and the precision waste acid filter; the top liquid outlet side of the precision waste acid filter is connected to the waste acid recovery tank; the bottom ends of the natural sedimentation tank and the precision waste acid filter are respectively connected to the titanium dioxide material recovery tank.
2. The device for improving the recovery concentration of waste acid from sulfuric acid process titanium dioxide according to claim 1, characterized in that: The solid content of the clear liquid after filtering by the precision waste acid filter is less than 20 ppm.