CN217092454U

CN217092454U - Titanium dioxide film washing and filtering system capable of reducing water consumption of acidolysis section

Info

Publication number: CN217092454U
Application number: CN202123405278.1U
Authority: CN
Inventors: 胡海军; 鞠浩; 周海涛
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: 2022-08-02
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a can reduce titanium dioxide powder membrane washing filtration system of acidolysis workshop section water consumption belongs to titanium white powder production technical field. The utility model discloses a hydrolysis material storage tank, plate and frame filter press, pulping tank, the circulation tank is washed to one, the bleaching jar, two wash the circulation tank and qualified material jar that connect gradually, the circulation tank is washed to one and is connected with first membrane washing device, the export and the pulping tank intercommunication of first membrane washing device, the circulation tank is washed to two and is connected with second membrane washing device, the export and the pulping tank intercommunication of second membrane washing device, the filtrating exit linkage of plate and frame filter press has spent acid powder recovery unit, spent acid powder recovery unit's clear solution export and acidolysis workshop section are connected. Adopt the utility model discloses production titanium white powder ton product water consumption is reduced to about 5 by about 27 sides, and titanium white powder yield has improved nearly 2 percentage points.

Description

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

Technical Field

The utility model belongs to the technical field of titanium white powder production, concretely relates to can reduce titanium white powder membrane washing filtration system of acidolysis workshop section water consumption.

Background

At present, in the domestic production of titanium dioxide, 95 percent of titanium dioxide is produced by 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 requirement of further improvement on quality is met, the fresh water consumption is large, the waste water amount generated by washing is also large, and the powder loss rate is high.

In the prior art, although water-saving measures such as recycling secondary washing water for primary washing and the like are adopted, the total water consumption is still very large, and 95m of water is consumed for producing each ton of titanium dioxide ³ On the left and right, many enterprises are at 100m ³ The 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. And the water consumption in the acidolysis process is very high, and if the wastewater in the membrane washing section can be treated and then used for acidolysis, the water consumption is necessarily greatly reduced, and the cost is saved.

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

To the problem that exists among the prior art, the utility model provides a can reduce titanium dioxide membrane washing filtration system of acidolysis workshop section water consumption, its aim at: the consumption of the water washing water is reduced, and the titanium dioxide productivity is improved.

The utility model adopts the technical scheme as follows:

the utility model provides a can reduce titanium dioxide powder membrane washing filtration system of acidolysis workshop section water consumption, washes holding tank and qualified material jar including the plate and frame filter press, the pulping tank that connect gradually, one washes holding tank, bleaching jar, two, one washes the holding tank and is connected with first membrane washing device, first membrane washing device's export and pulping tank intercommunication, two are washed the holding tank and are connected with second membrane washing device, second membrane washing device's export and pulping tank intercommunication, the filtrating exit linkage of plate and frame filter press has spent acid powder recovery unit, spent acid powder recovery unit's clear solution export and acidolysis workshop section are connected.

The filter liquor flowing out after filter pressing of the hydrolysis material plate frame contains a small amount of solid materials, and the small amount of solid materials in the filter liquor generated after filter pressing of the plate frame can be separated out through the waste acid powder recovery device, so that the recovery of the materials is realized. Clear liquid generated by the waste acid powder recovery device can be recycled in the acidolysis section, so that the fresh water consumption in the acidolysis section is reduced, and the cost is saved. Clear liquid separated by the first washing and the second washing middle membranes is sent into a pulping tank to be mixed with a filter cake for pulping, so that the water consumption during pulping can be saved, the concentration of discharged wastewater is further improved, the content of ferrous sulfate in 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 the plate and frame filter.

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.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. this system can separate out a small amount of solid material in the filtrating that produces behind the plate frame filter-pressing through waste acid powder recovery unit, realizes the recovery of material. Clear liquid generated by the waste acid powder recovery device can be recycled in the acidolysis section, so that the fresh water consumption in the acidolysis section is reduced, and the cost is saved. Clear liquid separated from the first washing and the second washing by the membrane is sent into a pulping tank to be mixed with a filter cake for pulping, so that water consumption during pulping can be saved, the concentration of discharged wastewater is further improved, the content of ferrous sulfate in pulp is further reduced, and solid particles in the clear liquid after the second washing can be recovered, so that the water consumption is reduced, and the capacity of titanium dioxide is improved.

2. The system 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 for producing titanium dioxide ton products by adopting the system 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 system through the membrane filtering device is less than or equal to 20ppm, so that the impurity content in the product is obviously reduced, and the gloss performance of the titanium dioxide is improved.

Drawings

The invention 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 can reduce titanium dioxide membrane washing filtration system of acidolysis workshop section water consumption, as shown in figure 1, including the plate and frame filter press, pulping tank, one wash the recycle tank, bleach the jar, two wash the recycle tank and qualified material jar that connect gradually, one wash the recycle tank and be 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, the filtrating exit linkage of plate and frame filter press has spent acid powder recovery unit, spent acid powder recovery unit's clear solution export and acidolysis workshop section are connected.

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 this embodiment, a filtrate outlet of the plate-and-frame filter press is connected with a waste acid powder recovery device, 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 to wash the water supply tank, two wash water supply tank and two wash the circulation tank intercommunication, membrane separation subassembly's dense solution exit linkage has the dense water pitcher, the dense water pitcher is connected with the frame filter. 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 and washing to obtain a filter cake and washing waste acidic water;

and 2, step: washing the filter cake, then sending the filter cake into a pulping tank, adding water into the pulping tank for pulping to obtain metatitanic acid slurry, recycling metatitanic acid from the washed waste acidic water through a powder recycling device, and leaching the waste acidic water in an acidolysis section for use;

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

and 4, step 4: sending the membrane-first washing slurry into a bleaching tank for bleaching, and sending membrane-first washing wastewater into a membrane separation assembly to prepare deionized water and concentrated wastewater;

and 5: and sending the bleached membrane first washing slurry into a second washing circulating tank for washing to obtain qualified membrane second washing slurry and membrane second washing clear liquid, sending the qualified membrane second washing slurry into the next working section, and using the membrane second washing clear liquid for membrane first washing.

The washing water used in the filter pressing washing in the step 1 is concentrated water separated by the membrane separation assembly, the waste acidic water generated in the filter pressing washing is used for recovering metatitanic acid in the waste acidic water through a waste acid powder recovery device, and the waste acidic water after recovering metatitanic acid is sent to an acidolysis working section for leaching.

And 4, preparing deionized water in the step 4, washing the membrane-washing slurry in a secondary washing circulating tank, and pre-washing a filter cake in a plate-and-frame filter press by using the concentrated wastewater.

And backwashing the first washing circulation tank, the second washing circulation tank and the membrane filtration assembly 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 of an acidolysis section is characterized in that: the acid hydrolysis recycling 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, the outlet of the second membrane washing device is communicated with the pulping tank, the filtrate outlet of the plate-and-frame filter press is connected with a waste acid powder recovery device, and the clear liquid outlet of the waste acid powder recovery device is connected with an acid hydrolysis working section; a washing water supply tank is arranged on a pipeline between the second membrane washing device and the pulping tank, the washing water supply tank is communicated with a washing circulation tank, 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.

2. The titanium dioxide membrane washing and filtering system capable of reducing water consumption of an acidolysis section according to claim 1, wherein the titanium dioxide membrane washing and filtering system comprises: and a ceramic membrane is arranged in the waste acid powder recovery device.

3. The titanium dioxide membrane water washing and filtering system capable of reducing water consumption of an acidolysis section as claimed in 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.

4. The titanium dioxide membrane water washing and filtering system capable of reducing water consumption of an acidolysis section as claimed in claim 3, wherein: and a concentrated solution outlet of the membrane separation component is connected with a concentrated solution tank, and the concentrated solution tank is connected with the plate and frame filter.