CN216687524U

CN216687524U - Titanium dioxide film washing and filtering system capable of reducing water consumption

Info

Publication number: CN216687524U
Application number: CN202123412701.0U
Authority: CN
Inventors: 鞠浩; 朱先念
Original assignee: Longbai Xiangyang Titanium Industry Co ltd
Current assignee: Longbai Xiangyang Titanium Industry Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-06-07
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a titanium white powder membrane washing and filtering system capable of reducing water consumption, and belongs to the technical field of titanium white powder production. The device comprises a hydrolysis material storage tank, a plate-and-frame filter press, a pulping tank, a first washing circulation tank, a bleaching tank, a second washing circulation tank and a qualified material tank which are sequentially connected, wherein the first washing circulation tank is connected with a first membrane washing device, the outlet of the first membrane washing device is communicated with the pulping tank, the second washing circulation tank is connected with a second membrane washing device, and the outlet of the second membrane washing device is communicated with the pulping tank. The water consumption of the titanium dioxide ton product produced by the method is reduced from about 27 to about 5, and the titanium dioxide yield is improved by about 2 percent.

Description

Titanium dioxide film washing and filtering system capable of reducing water consumption

Technical Field

The utility model belongs to the technical field of titanium dioxide production, and particularly relates to a titanium dioxide membrane washing and filtering system capable of reducing water consumption.

Background

At present, in the domestic production of titanium dioxide, 95 percent of titanium dioxide is produced by adopting a sulfuric acid method, a plate-and-frame washing process adopted in the titanium dioxide industry of the sulfuric acid method or other traditional washing processes, the quality is required to be further improved, the fresh water consumption is large, and the washing product is producedThe raw waste water amount is also large, and the powder loss rate is high. Although the company adopts the water-saving measures of recycling the secondary washing water for the primary washing and the like at present, the total water consumption is still very large, and 95m of water is consumed for producing each ton of titanium dioxide³On the left and right, other enterprises are all at 100m³The above. Because of the reasons of washing and filtering the plate frame, the yield of the titanium dioxide is lower and is less than 90 percent. The existing titanium dioxide film washing and water washing water circulation system is improved, the quality and the yield of the titanium dioxide are improved to a certain extent, the water circulation utilization rate is improved, and the wastewater treatment capacity is reduced. The production of high-quality titanium dioxide with lower energy consumption has important influence on the sustainability of titanizing industry.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model provides a titanium dioxide film washing and filtering system capable of reducing water consumption, which aims to: the consumption of the water washing water is reduced, and the titanium dioxide productivity is improved.

The technical scheme adopted by the utility model is as follows:

the utility model provides a titanium dioxide membrane washing filtration system of reducible water consumption, includes hydrolysis material storage tank, plate and frame filter press, the pulping tank that connects gradually, washes the holding vessel, bleaches the jar, two washes the holding vessel and qualified material jar, it is connected with first membrane washing device to wash the holding vessel, the export and the pulping tank intercommunication of first membrane washing device, two are washed the holding vessel and are connected with second membrane washing device, the export and the pulping tank intercommunication of second membrane washing device.

After the technical scheme is adopted, clear liquid separated by the first washing and the second washing middle membranes can be sent into the pulping tank to be mixed with the filter cake for pulping, so that the water consumption during pulping is saved, the concentration of discharged wastewater is further improved, the content of ferrous sulfate in the pulp is reduced, and solid particles in the clear liquid after the second washing can be recovered, thereby reducing the water consumption and improving the capacity of titanium dioxide.

Preferably, a washing water supply tank is arranged on a pipeline between the second membrane washing device and the pulping tank, and the washing water supply tank is communicated with a washing circulation tank.

After the preferred scheme is adopted, the clear liquid separated after the second washing can be used as the first washing water, so that the cyclic utilization of water resources is realized, and the water consumption is reduced.

Preferably, the first membrane washing device is connected with a membrane separation water tank, and the membrane separation water tank is communicated with a water inlet of the pulping tank.

After the preferred scheme is adopted, the clean liquid after being washed can be stored through the membrane separation water tank and used as pulping water, so that the recycling of water resources is realized, and meanwhile, the residual materials in the clean liquid are recycled, and the yield of the titanium dioxide is improved.

Preferably, the first membrane washing device is connected with a membrane separation assembly, a clear liquid outlet of the membrane separation assembly is connected with two washing water supply tanks, and the two washing water supply tanks are communicated with the two washing circulation tanks.

Preferably, a concentrated solution outlet of the membrane separation assembly is connected with a concentrated solution tank, and the concentrated solution tank is connected with a plate-and-frame filter press.

After the preferred scheme is adopted, one part of the clear liquid after the first washing can be used for pulping, the other part of the clear liquid is subjected to membrane separation, the concentrated water after the membrane separation is sent into the concentrated water tank for storage and is used for plate-frame filter pressing, the clear liquid after the membrane separation is sent into the second washing water supply tank for storage and is used as second washing replenishing water, the cyclic utilization of the washing water is realized, and the consumption of the water is further reduced.

In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:

1. according to the utility model, a plate-and-frame filter press is adopted for first washing feeding, after filter pressing is completed, concentrated water separated by a membrane separation assembly is used for washing a filter cake, the concentration of discharged wastewater is further improved, the content of ferrous sulfate in slurry is reduced, and then clear liquid generated by first washing is used for pulping and then enters a first washing circulation tank. Clear liquid generated by membrane washing mainly contains ferrous sulfate, the clear liquid adopts a membrane separation assembly to intercept ferrous sulfate in wastewater, and intercepted concentrated water containing high-concentration ferrous sulfate is sent to an acidolysis working section after washing a plate-and-frame filter cake, so that the water consumption of acidolysis is reduced, and the capacity of titanium dioxide is improved.

2. The utility model adopts membrane washing, metatitanic acid particles are almost completely intercepted, clear liquid generated by the washing of the two washing membranes returns to the first washing circulation tank to be used as first washing water for recycling, and the intercepted metatitanic acid is conveyed to a titanium recovery working section. The iron content (simple substance iron) in the material after the second washing is lower than 10 ppm.

3. The water consumption of the titanium dioxide ton product produced by the method is reduced from about 27 to about 5, and the titanium dioxide yield is improved by about 2 percent.

4. The average Fe content of the two-washing pulping material obtained by the membrane filtration device is less than or equal to 20ppm, so that the impurity content in the product is obviously reduced, and the gloss of titanium dioxide is improved.

Drawings

The utility model will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic diagram of the present system.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.

The present invention will be described in detail with reference to fig. 1.

The utility model provides a titanium dioxide membrane washing filtration system of reducible water consumption, as shown in figure 1, including the material storage tank of hydrolysising, plate and frame filter press, the pulping tank, one wash the circulation jar, bleach the jar, two wash circulation jar and qualified material jar that connect gradually, one wash the circulation jar and be connected with first membrane washing device, the export and the pulping jar intercommunication of first membrane washing device, two wash the circulation jar and be connected with second membrane washing device, the exit linkage of second membrane washing device has one to wash the water supply tank, one wash the export and the pulping jar intercommunication of water supply tank.

And (3) carrying out filter pressing on the hydrolyzed material through a plate-and-frame filter press, feeding the filter cake into a pulping tank for pulping, washing the pulping material through a first washing circulating tank, a bleaching tank and a second washing circulating tank in sequence to obtain qualified metatitanic acid particles, and then feeding the metatitanic acid particles into a qualified material tank for storage and feeding into the next working section. Clear liquid generated by the first washing and the second washing is sent into the pulping tank again to be recycled as water for pulping, so that the wastewater treatment amount is reduced, the water consumption is reduced, and metatitanic acid particles in the wastewater are recovered, so that the yield is improved.

In another embodiment, the filtrate outlet of the plate-and-frame filter press is connected with a waste acid powder recovery device (not shown in the figure), and a ceramic membrane is arranged in the waste acid powder recovery device. And (3) carrying out membrane filtration on the filtrate generated by the filter press through a ceramic membrane, and recovering solid materials in the filtrate.

In this embodiment, first membrane washing device is connected with the membrane separation water pitcher, the membrane separation water pitcher is connected with beating jar and membrane separation subassembly respectively, membrane separation subassembly's clear solution exit linkage has two washing water supply tanks, two washing water supply tanks and two washing circulation tanks intercommunication, membrane separation subassembly's dense solution exit linkage has the dense water pitcher, the dense water pitcher is connected with the filter press. The clear liquid generated by the first washing is divided into two parts, one part is used for pulping, the other part is subjected to membrane separation, the concentrated water after the membrane separation is used for washing the filter cake again, and the clear liquid after the membrane separation is used as the water supply for the second washing, so that the cyclic utilization is realized, and the water consumption and the wastewater treatment capacity are further reduced.

The steps of adopting the system to carry out membrane water washing are as follows:

step 1: feeding the hydrolyzed material into a plate-and-frame filter press for filter pressing to obtain a filter cake and filtrate;

step 2: feeding the filter cake into a pulping tank, and adding water into the pulping tank for pulping to obtain metatitanic acid slurry;

and step 3: sending the metatitanic acid slurry into a washing circulation tank for washing to obtain membrane-washing slurry and membrane-washing clear liquid;

and 4, step 4: sending the membrane-washing slurry into a bleaching tank for bleaching;

and 5: sending the bleached membrane-first washing slurry into a second washing circulating tank for washing to obtain metatitanic acid particles and membrane-second washing clear liquid;

step 6: and (4) sending the metatitanic acid particles to the next working section, and sending the membrane second washing clear liquid to the pulping tank again.

And (3) sending the filtrate obtained in the step (1) into a waste acid powder recovery device, and recovering solid materials in the filtrate to obtain waste acid.

And (3) sending one part of the membrane-first washing liquid in the step (3) into a pulping tank, sending the other part of the membrane-first washing liquid into a membrane separation assembly, sending the clear liquid separated by the membrane separation assembly into a second washing water supply tank, and sending the concentrated liquid separated by the membrane separation assembly into a plate-and-frame filter press again for filter pressing.

And backwashing the first washing circulation tank, the second washing circulation tank and the membrane filtration component by using process water, wherein the backwashing period is 2 months/time. The permeable membrane can be prevented from being blocked by timing backwashing, so that the filtering effect is influenced. The backwashing period can also be determined according to the actual use condition.

The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.

Claims

1. A titanium dioxide film washing and filtering system capable of reducing water consumption is characterized in that: including the material storage tank of hydrolysising, plate and frame filter press, the pulping tank that connects gradually, one wash the recycle tank, bleach the jar, two wash the recycle tank and qualified material jar, one is washed the recycle tank and is connected with first membrane washing device, the export and the pulping tank intercommunication of first membrane washing device, two are washed the recycle tank and are connected with second membrane washing device, the export and the pulping tank intercommunication of second membrane washing device.

2. The titanium dioxide film washing and filtering system capable of reducing water consumption according to claim 1, wherein: and a washing water supply tank is arranged on a pipeline between the second membrane washing device and the pulping tank, and the washing water supply tank is communicated with a washing circulating tank.

3. The titanium dioxide film washing and filtering system capable of reducing water consumption according to claim 1, wherein: the first membrane washing device is connected with a membrane separation water tank, and the membrane separation water tank is communicated with a water inlet of the pulping tank.

4. The titanium dioxide film washing and filtering system capable of reducing water consumption according to claim 1, wherein: first membrane washing device is connected with membrane separation subassembly, membrane separation subassembly's clear solution exit linkage has two to wash and supplies the water tank, two wash and supply water tank and two wash the circulating tank intercommunication.

5. The titanium dioxide film washing and filtering system capable of reducing water consumption according to claim 4, wherein: and a concentrated solution outlet of the membrane separation assembly is connected with a concentrated solution tank, and the concentrated solution tank is connected with a plate-and-frame filter press.