CN219356528U - Phosphogypsum innocent treatment system - Google Patents

Abstract

The utility model relates to the technical field of phosphogypsum treatment, in particular to a phosphogypsum harmless treatment system, which comprises a rotary table filter I, a slurry mixing tank, a rotary table filter II, a washing component I, a washing component II, a clarifying tank and a filter cloth washing tank; the slurry containing impurities is guided into a first rotary table filter through a slurry guide pipe, the first rotary table filter is subjected to primary filtration, and the slurry after primary filtration is guided into a slurry mixing tank to be stirred, so that the impurities in the slurry are further dispersed in slurry liquid, and then the slurry is conveyed into a second rotary table filter to be filtered again; at this time, in order to strengthen the impurity removal effect, the phosphogypsum in the rotary table filter II is washed by the washing component I and the washing component II, so that the impurity in the phosphogypsum is further reduced, and the problem that the phosphogypsum is influenced by the fact that the phosphogypsum contains various impurities such as unwashed phosphoric acid, fluoride, iron, aluminum compounds, acid insoluble substances, organic matters and the like during treatment is solved.

Description

Phosphogypsum innocent treatment system

Technical Field

The utility model relates to the technical field of phosphogypsum treatment, in particular to a phosphogypsum harmless treatment system.

Background

In the wet phosphoric acid production process, sulfuric acid reacts with phosphorite slurry to generate phosphogypsum slurry, the phosphogypsum slurry is dried to form block phosphogypsum, the main chemical component of the phosphogypsum is calcium sulfate, and each time 1t of phosphoric acid is produced, about 5t of dry phosphogypsum is produced.

Along with the continuous increase of the demand of high-concentration phosphorus compound fertilizer at home and abroad, the development of wet-process phosphoric acid industry is gradually expanded, the yield of phosphogypsum is increased, but the CaSO is not contained in the prior phosphogypsum ₄ Besides, the phosphogypsum also contains various impurities such as undigested phosphogypsum slurry, unwashed phosphoric acid, fluoride, iron, aluminum compound, acid insoluble substances, organic matters and the like, and the impurities seriously affect the utilization of phosphogypsum.

At present, for various impurity treatment modes such as non-decomposed phosphate rock slurry, non-washed phosphoric acid, fluoride, iron, aluminum compound, acid insoluble matters, organic matters and the like in phosphogypsum, such as a phosphogypsum washing system disclosed in CN202122443519.5, the basic structure is as follows: the device comprises a stirring tank and a heat exchanger, wherein the stirring tank is provided with a slurry outlet, a supernatant outlet and a supernatant circulating inlet, the supernatant outlet and the supernatant circulating inlet are respectively positioned at the upper end and the lower end of the stirring tank, the supernatant outlet is connected with the inlet end of the heat exchanger, and the supernatant circulating inlet is connected with the outlet end of the heat exchanger; when the phosphogypsum washing device is used, the supernatant in the stirring tank is sent into the heat exchanger for heating, and is newly sent into the stirring tank through the supernatant circulating inlet after being heated, so that the slurry deposited at the bottom of the stirring tank is dispersed, the viscosity of the slurry is reduced through the heating of the heat exchanger in the washing process, the mass transfer effect is greatly improved, and the washing effect of the phosphogypsum is greatly improved.

However, the above washing method has the following defects:

(1) Before the washing mode, impurities in the gypsum slurry are not filtered, so that part of impurities in the gypsum slurry are remained in the slurry deposited in the bottom of the stirring tank, and the quality and the use of phosphogypsum are further affected;

(2) The device does not disclose a device for specifically treating impurities (phosphorite, phosphoric acid, calcium fluoride, sodium fluoride and Si, mg, al, fe mentioned in the background art) in phosphogypsum, so that the slurry deposited at the bottom of the stirring tank also contains impurities, and the quality and the use of phosphogypsum are further affected.

Therefore, it is necessary to improve and design the treatment link of phosphogypsum, so as to solve the problem that the phosphogypsum is affected by containing various impurities such as unwashed phosphoric acid, fluoride, iron, aluminum compound, acid insoluble substances, organic matters and the like during the treatment of phosphogypsum.

Disclosure of Invention

The utility model aims to provide an phosphogypsum harmless treatment system, which solves the problem that the phosphogypsum is affected in use due to the fact that the phosphogypsum contains various impurities such as unwashed phosphoric acid, fluoride, iron, aluminum compounds, acid insoluble substances, organic matters and the like during treatment.

In order to solve the technical problems, the utility model adopts the following technical scheme:

an phosphogypsum innocent treatment system comprises a rotary table filter I, a slurry mixing tank, a rotary table filter II, a washing component I, a washing component II, a clarifying tank and a filter cloth washing tank; the first rotary table filter is connected with the liquid outlet end of the slurry guide pipe, and the first rotary table filter is connected with the liquid inlet end of the second rotary table filter through a slurry mixing tank; the rotary table filter II is connected with the washing assembly I and the washing assembly II for removing soluble phosphorus and fluorine respectively.

Further, the first washing component comprises a circulating conduit, a first stop valve, a circulating pump and a lime milk circulating tank; the circulating conduit pipeline is connected with the rotary table filter II, a stop valve I is arranged on the circulating conduit pipeline, and one end of the circulating conduit is communicated with the lime milk circulating tank through a circulating pump; the other end of the circulating conduit is communicated with a lime milk circulating groove, and a quicklime input port is formed in the upper part of the lime milk circulating groove.

Further, the PH measuring instrument is installed to lime cream circulation groove lateral wall, and PH measuring instrument monitoring end is located inside the lime circulation groove, and PH measuring instrument registration display end is located the lime cream circulation groove outside.

Further, the second washing component comprises a water guide pipe, a cleaning pump, a water line for phosphoric acid production and a second stop valve; the water guide pipe pipeline is connected with the rotary table filter II, and one end of the water guide pipe is connected with a water containing tank filled with process water through a water guide pump; the water guide pipeline is respectively provided with a stop valve II and a cleaning pump, and the other end of the water guide pipeline is connected with a water line for phosphoric acid production.

Further, the second discharging end of the rotary table filter is connected with a gypsum output line, the gypsum output line is arranged as a belt conveyor, and the discharging end of the belt conveyor is positioned in the temporary storage yard.

Further, the liquid outlet end of the rotary table filter I is communicated with the slurry inlet end of the slurry mixing tank through a slurry guide pipe I, the liquid outlet end of the slurry mixing tank is communicated with the leading-in end of the rotary table filter II through a slurry guide pipe II and a slurry pump, and the slurry pump is arranged on the pipeline of the slurry guide pipe II.

Further, the second outlet end of the rotary table filter is communicated with the liquid inlet end of the clarifying tank through a first liquid guide pipe with a liquid filtering pump, and the liquid outlet end of the clarifying tank is communicated with the liquid inlet end of the filter cloth washing tank through an overflow pipe.

Further, the liquid outlet end of the filter cloth washing tank is communicated with the rotary table filter II through a liquid guide pipe II with a washing pump, a stop valve III is arranged on a pipeline of the liquid guide pipe II, and the other end of the liquid guide pipe II is communicated with the liquid inlet end of the reslurry tank.

Further, the liquid outlet end of the reslurry tank is communicated with the liquid inlet end of the pulp mixing tank through a liquid guide pipe III and a pulp guide pump, and the pulp guide pump is arranged on the liquid guide pipe III.

Further, stirring components are respectively arranged on the size mixing tank, the re-sizing tank and the lime milk circulating tank; the stirring assembly comprises a motor, a stirring shaft and a stirring paddle; the motor is respectively arranged at the upper parts of the size mixing tank, the re-sizing tank and the lime milk circulating tank, the output shaft of the motor is respectively connected with stirring shafts inside the size mixing tank, the re-sizing tank and the lime milk circulating tank, and stirring paddles are sequentially connected on the stirring shafts from top to bottom.

When in operation, the device comprises: the method comprises the steps that slurry containing impurities is guided into a rotary table through a slurry guiding pipe to be filtered, coarse impurities in the slurry are filtered through a rotary table filter I, gypsum slurry containing fine impurities after filtration is guided into a slurry mixing tank to be stirred, fine impurities in the gypsum slurry are dissolved in stirring liquid, then the stirring liquid is guided into a rotary table filter II, the fine impurities are filtered through the rotary table filter II, filtered filtrate is sequentially discharged into a clarifying tank and a filter cloth washing tank to be filtered and washed, washing liquid is guided into the slurry mixing tank again to be used as slurry mixing water after washing, recycling of tail water is achieved, and the first step of harmless treatment is achieved.

After the second rotary table filter is filtered, gypsum which is reserved on the second rotary table filter and contains soluble phosphorus and fluorine impurities is washed by the second washing component, so that the soluble phosphorus and fluorine impurities are dissolved and discharged into the second rotary table filter 3 along the second washing component; after the first washing component is used for washing, the second washing component is used for washing the gypsum in the second rotary table filter, so that acidic impurities in the gypsum are neutralized and removed, the impurity content in the gypsum is further reduced, and the washing liquid is discharged out of the second rotary table filter along the first washing component 4 and is used as stirring water for the first washing component to be repeatedly used, and a second step of harmless treatment is realized.

Compared with the prior art, the utility model has at least one of the following beneficial effects:

1. the utility model introduces the slurry containing impurities (slurry is generated by the reaction of sulfuric acid and phosphorite slurry) into a rotary table filter I through a slurry guide pipe, the rotary table filter I carries out primary filtration, the slurry after primary filtration is introduced into a slurry mixing tank for stirring, so that the impurities in the slurry are further dispersed in slurry liquid, and then the slurry is conveyed into the rotary table filter II for secondary filtration; at this time, in order to strengthen the impurity removal effect, the phosphogypsum in the rotary table filter II is washed by the washing component I and the washing component II, so that soluble phosphorus, fluorine, iron, aluminum compounds and organic impurities in the phosphogypsum are dissolved and discharged, and the impurities in the phosphogypsum are further reduced, thereby solving the problem that the use of the phosphogypsum is affected due to the fact that the phosphogypsum contains a plurality of impurities such as uncleaned phosphoric acid, fluoride, iron, aluminum compounds, acid insoluble substances and organic matters during the treatment.

2. According to the utility model, the tail water produced by phosphogypsum is sequentially discharged into the clarifying tank, the filter cloth washing tank, the rotary table filter II, the reslurry tank and the slurry mixing tank circuit, the clarifying tank and the filter cloth washing tank are used for filtering and washing the tail water, the washed tail water is discharged into the rotary table filter II for washing, and the washed washing liquid is returned into the phosphogypsum production circuit through the reslurry tank and the slurry guide pump to be used as slurry mixing water in the slurry mixing tank, so that water resources are saved, the tail water is fully utilized, and the purpose of harmless treatment is achieved.

3. According to the utility model, the washing water for washing phosphogypsum by the washing component II is discharged into the water line for phosphoric acid production, so that not only are the water-soluble phosphorus and fluorine washed by phosphogypsum recovered, but also water resources are saved, and the purpose of harmless treatment is realized.

Drawings

FIG. 1 is a schematic view of the exterior of the structure of the present utility model.

FIG. 2 is a schematic diagram of the inside of the structure of the present utility model.

FIG. 3 is a schematic diagram showing the integration of a second rotary table filter and a second washing assembly in the structure of the utility model.

FIG. 4 is a schematic diagram of the integration of the rotary table filter II and the washing assembly I in the structure of the utility model.

In the figure, a first rotary table filter, a 2-slurry mixing tank, a second rotary table filter, a first 4-washing component, a second 5-washing component, a 6-clarifying tank, a 7-filter cloth washing tank, an 8-slurry guide pipe, a 9-reslurry tank, a first 10-stop valve, a 11-circulating pump, a 12-lime milk circulating tank, a 13-PH measuring instrument, a 14-water guide pipe, a 15-cleaning pump, a second 16-stop valve, a 17-liquid guide pump, a first 18-slurry guide pipe, a second 19-slurry guide pipe, a 20-slurry pump, a 21-liquid filter, a first 22-liquid guide pipe, a 23-overflow pipe, a 24-washing pump, a second 25-liquid guide pipe, a third 26-stop valve, a third 27-liquid guide pipe, a 28-slurry guide pump, a 29-stirring shaft, a 30-stirring paddle, a 31-circulating pipe, a 32-gypsum output line and a 33-stop valve are arranged.

Detailed Description

The present utility model will be further described in detail with reference to the drawings and examples, as shown in fig. 1-4, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Examples

Referring to fig. 1, an phosphogypsum innocent treatment system comprises a rotary table filter 1, a slurry mixing tank 2, a rotary table filter 3, a washing component 4, a washing component 5, a clarifying tank 6 and a filter cloth washing tank 7; the rotary table filter I1 is connected with the liquid outlet end of the slurry guide pipe 8, and the rotary table filter I1 is connected with the liquid inlet end of the rotary table filter II 3 through the slurry mixing tank 2; the rotary table filter II 3 is connected with the filter cloth washing tank 7 through the clarifying tank 6, the filter cloth washing tank 7 is connected with the size mixing tank 2 through the rotary table filter II 3 and the reslurry tank 9, and the rotary table filter II 3 is respectively connected with the washing component I4 and the washing component II 5 for removing soluble phosphorus and fluorine.

The slurry guide pipe 8 is used for conveying slurry (impurities are contained in slurry) generated by the reaction of phosphoric acid and phosphorite slurry, a guide pump is arranged on a pipeline of the slurry guide pipe 8, and the other end of the slurry guide pipe is communicated with a containing groove for containing the slurry.

The clarifying tank, the filter cloth washing tank, the rotary table filter I and the rotary table filter II are all commonly used equipment in the chemical industry field, and are not improved and designed in the prior art, so the structure of the clarifying tank, the filter cloth washing tank, the rotary table filter I and the rotary table filter II is not described in detail.

During operation, slurry containing impurities is led into a rotary table filter I through a slurry guide pipe 8, coarse impurities in the slurry are filtered by the rotary table filter I, the gypsum slurry which is filtered and contains fine impurities is led into a slurry mixing tank 2 to be stirred, the fine impurities in the gypsum slurry are dissolved in stirring liquid, then the stirring liquid is led into a rotary table filter II 3, the rotary table filter II filters the fine impurities, the filtered filtrate is sequentially discharged into a clarifying tank 6 and a filter cloth washing tank 7 to be filtered and washed, washing liquid is led into the slurry mixing tank 2 again to be used as slurry mixing water, recycling of tail water is realized, and the first step of innocent treatment is realized; after the second rotary table filter 3 filters, gypsum which remains on the second rotary table filter 3 and contains soluble phosphorus and fluorine impurities is washed by the second washing component, so that the soluble phosphorus and fluorine impurities are dissolved and discharged into the second rotary table filter 3 along the second washing component; after washing by the first washing component 4, the second washing component 5 washes the gypsum in the second rotary table filter 3, so that acidic impurities in the gypsum are neutralized and removed, the impurity content in the gypsum is further reduced, and the washing liquid is discharged out of the second rotary table filter 2 along the first washing component 4 and is used as stirring water for the first washing component 4 repeatedly, so that the second step of harmless treatment is realized.

Referring to fig. 2 and 4, the first washing unit 4 includes a circulation pipe 31, a first stop valve 10, a circulation pump 11 and a lime milk circulation tank 12; the pipeline of the circulating conduit 31 is connected with the rotary table filter II 3, a stop valve I10 is arranged on the pipeline of the circulating conduit 31, and one end of the circulating conduit 31 is communicated with the lime milk circulating tank 12 through a circulating pump 11; the other end of the circulating conduit 31 is communicated with a lime milk circulating tank 12, and a quicklime feeding port is formed in the upper part of the lime milk circulating tank 12; when the gypsum in the rotary table filter II 3 is required to be washed, the stop valve I10 is opened, the circulating liquid in the lime milk circulating tank 12 is led into the rotary table filter II 3 through the cooperation of the circulating conduit 31 and the circulating pump 11, the circulating liquid with the pH value of 9-12 washes the gypsum which is in the rotary table filter II 3 and contains impurities, and the circulating liquid after washing is led into the lime milk circulating tank 12 through the circulating conduit 31 for the next washing process of the circulating liquid to the rotary table filter II 3.

In order to ensure that sufficient stirring water exists in the lime milk circulating tank 12, the lime milk circulating tank is connected with a water guide device; the water guide device comprises a water guide pipe, a water guide pump and a water tank; more specifically, one end of the water guide pipe is communicated with the side wall of the lime milk circulating tank 12, the other end of the water guide pipe is communicated with the water tank, the water guide pump is arranged on the pipeline of the water guide pipe, when the stirring water in the lime milk circulating tank is not enough in supply, the water in the water tank can be guided into the lime milk circulating tank 12 through the water guide pipe and the water guide pump in a matching manner, and the situation of insufficient water supply in a gypsum washing line is avoided.

The quicklime inlet is an inlet with an end cover; an exhaust port is also installed at the upper part of the lime milk circulating tank 12 to exhaust hot gas generated by the quicklime and the water out of the lime milk circulating tank.

Referring to fig. 1-2, in order to further understand the alkalinity of the circulating liquid in the lime milk circulating tank, a PH measuring instrument 13 is installed on the side wall of the lime milk circulating tank 12; the monitoring end of the PH measuring instrument 13 is positioned in the lime circulating groove, and the indication display end of the PH measuring instrument 13 is positioned outside the lime milk circulating groove; when the alkalinity of the circulating liquid in the circulating tank needs to be known, the numerical value displayed by the PH measuring instrument 13 can be used for facilitating an operator to further change the alkalinity of the circulating liquid by throwing quicklime into the lime milk circulating tank 12, so that the PH value of the circulating liquid is maintained at 9-12, the circulating liquid with the PH value of 9-12 is favorably guided into the rotary table filter II 3, the gypsum containing impurities is washed, and the washing process of the gypsum containing impurities is avoided due to the too low PH value of the circulating liquid.

The PH measuring instrument is a device commonly used in the chemical industry, has good corrosion resistance, is not improved or designed in the prior art, and will not be described in detail.

Referring to fig. 2 and 3, the second washing unit 5 includes a water guide pipe 14, a washing pump 15, a water line for phosphoric acid production, and a second stop valve 16; the pipeline of the water guide pipe 14 is connected with the rotary table filter II 3, and one end of the water guide pipe 14 is connected with a water containing tank filled with process water through a water guide pump 17; a second stop valve 16 and a cleaning pump 15 are respectively arranged on the water guide pipe 14, and the other end of the water guide pipe 14 is connected with a water line for phosphoric acid production; wherein the process water is filtered and does not contain other harmful impurities; when the gypsum remained in the rotary table filter II 3 needs to be washed, the stop valve II 16 is opened, the process water in the water containing tank is led into the rotary table filter II 3 by means of the cooperation of the water guide pipe 14 and the liquid guide pump 17, the process water washes and dissolves soluble phosphorus and fluorine in the rotary table filter 3, and the washed washing liquid is led into the phosphoric acid production waterline through the cleaning pump 15 and the water guide pipe 14, and flows to other water pipelines after passing through the filtering equipment in the phosphoric acid production waterline so as to assist the link of the phosphoric acid production water.

It should be noted that, the second stop valve 16 is in the prior art, and the second stop valve 16 is in a closed state when the second stop valve 16 is used in other washing pipelines, so as to avoid affecting the use process of other pipelines.

It should be noted that, the water line for phosphoric acid production is a line in a phosphoric acid production system, and the phosphoric acid production system is a prior art in the chemical industry field, and is not improved and designed, so it is not described in detail.

Referring to fig. 2, in order to facilitate the guiding out of phosphogypsum (phosphogypsum: washed by the first washing component and the second washing component) with extremely low impurity content in the second rotary table filter 3, the discharging end of the second rotary table filter 3 is connected with a gypsum output line 32; the gypsum output line is arranged as a belt conveyor, and the discharge end of the belt conveyor is positioned in the temporary storage yard; when the gypsum slurry in the second rotary table filter 3 is placed in a block shape or cooled to be in a block shape by a fan, an operator can start a belt conveyor, place the block gypsum slurry on the belt conveyor, and transfer the block gypsum slurry into a temporary storage yard by the belt conveyor for placement or storage; the phosphogypsum stored at the moment has extremely low impurity, so that the pollution to the environment of a temporary storage yard is further reduced, and the purpose of harmless treatment is achieved.

Referring to FIG. 2, in order to facilitate the phosphogypsum which is filtered by the first rotary table filter 1 and still contains impurities to be introduced into the slurry mixing tank 2 and the second rotary table filter 3, the liquid outlet end of the first rotary table filter 1 is communicated with the slurry inlet end of the slurry mixing tank 2 through the first slurry guide pipe 18; the liquid outlet end of the rotary table filter I1 is higher than the liquid inlet end of the slurry mixing tank 2, the liquid outlet end of the slurry mixing tank 2 is communicated with the leading-in end of the rotary table filter II 3 through a slurry guide pipe II 19 and a slurry pump 20, and the slurry pump 20 is arranged on the pipeline of the slurry guide pipe II 19; when phosphogypsum still containing impurities is required to be led into the rotary table filter II 3 for impurity removal and filtration again, firstly, the phosphogypsum which is filtered and contains impurities is led into the slurry mixing tank 2 through the slurry guide pipe I18 for stirring, so that the impurities in the phosphogypsum are remained in slurry; the phosphogypsum slurry after stirring is matched through a slurry guide pipe II 19 and a slurry pump 20, is guided into a rotary table filter II 3 for impurity removal and filtration again, so that impurities in phosphogypsum are reduced, and preparation is made for the step of washing phosphogypsum later.

The slurry pump 2 is a device commonly used in the chemical industry, and is not improved and designed in the prior art, so its structure will not be described in detail.

It should be noted that the water for the slurry mixing required by the slurry mixing tank 2 can also be externally connected with a water supply device; the water supply device comprises a water delivery pipe, a water pump and a water tank; more specifically, one end of the water delivery pipe is communicated with the size mixing tank 2, the other end of the water delivery pipe is communicated with a water tank containing tap water, and a water pump is arranged on the water delivery pipe; when the circulating water in the gypsum washing line is not enough, the water supply device can be used for timely introducing required stirring water into the slurry mixing tank 2, so that the stirring process in the slurry mixing tank 2 is ensured to be smoothly carried out.

Referring to fig. 2, in order to guide the filtrate filtered and guided by the second rotary table filter 3 into the clarifying tank 6, the guiding end of the second rotary table filter 3 is communicated with the liquid inlet end of the clarifying tank 6 through a first liquid guide tube 22 with a liquid filter pump 21, and the liquid outlet end of the clarifying tank 6 is communicated with the liquid inlet end of the filter cloth washing tank 7 through an overflow tube 23; when the filtrate filtered by the rotary table filter II 3 is required to be guided into the clarifying tank 6 for clarification, the filtrate is guided into the filtrate pump 21 for primary filtration by means of the cooperation of the filtrate pump 21 and the liquid guide pipe I22, the filtered filtrate is guided into the clarifying tank 6 for clarification, and the clarified filtrate is guided into the filter cloth washing tank 7 by the overflow pipe for washing and secondary filtration, so that impurities in the filtrate are further filtered; wherein the catheter one 22 is also provided with a shut-off valve 33.

In this scheme, in order to be convenient for discharge the impurity of the inside sediment of clarifying tank 6, the drain pipe that has the valve is connected to the bottom of clarifying tank 6, and after clarifying tank 6 used, open the valve on the drain pipe, make the sediment discharge to the sedimentation tank in, accomplish the clearance process to the sediment material.

Referring to fig. 1, in order to facilitate the guiding of the filtrate washed in the filter cloth washing tank 7 into the reslurry tank 9 or the cleaning of the turntable filter two 3 after the end of use, the liquid outlet end of the filter cloth washing tank 7 is communicated with the turntable filter two 3 through a liquid guide tube two 25 with a washing pump 24, and the other end of the liquid guide tube two 25 is communicated with the liquid inlet end of the reslurry tank 9; wherein, a stop valve III 26 is arranged on the pipeline of the catheter II 25; when the second rotary table filter 3 after the use is required to be cleaned or phosphogypsum remained in the second rotary table filter 3 is required to be cleaned, the third stop valve 26 is opened, the cleaning liquid in the filter cloth cleaning tank 7 is led into the second rotary table filter 3 by means of the cooperation of the cleaning pump 24 and the second liquid guide pipe 25, the cleaning liquid is used for cleaning the second rotary table filter 3 or the phosphogypsum is cleaned, and the cleaned cleaning water is led into the reslurry tank 9 to complete the cleaning process of the second rotary table filter 3.

It should be noted that, the stop valve three 26 is a device commonly used in chemical industry, and is not improved and designed in the prior art, so its structure will not be described in detail.

The third stop valve 26 is in a closed state when the second rotary table filter 3 is cleaned by filtering phosphogypsum slurry or other washing lines, so that the phosphogypsum slurry is prevented from being led into the reslurry tank 9 from the second rotary table filter 3, and the using process of the whole phosphogypsum washing line is prevented from being influenced.

Referring to fig. 2, in order to facilitate guiding the slurry in the reslurry tank 9 into the slurry mixing tank 2, the liquid outlet end of the reslurry tank 9 is communicated with the liquid inlet end of the slurry mixing tank 2 through a third catheter 27 and a slurry guiding pump 28, and the slurry guiding pump 28 is arranged on the third catheter 27; when the phosphogypsum (phosphogypsum: powdery phosphogypsum) which is filtered and still contains part of impurities is required to be stirred, the reslurry in the reslurry tank 9 can be led into the slurry mixing tank 2 by means of the cooperation of the slurry guiding pump 28 and the liquid guiding pipe III 27, so that the stirring process of the slurry mixing tank 2 is smoothly carried out; in the scheme, the reslurry liquid in the reslurry tank 9 is the tail water after phosphogypsum is washed, and the tail water is filtered and then is led into the phosphogypsum washing line again through the reslurry tank 9, so that water resources are saved, pollution caused by direct discharge of the tail water to the environment is avoided, and the purpose of harmless treatment is achieved.

It should be noted that, the slurry pump 28 may also be a peristaltic pump, and the slurry pump 28 is not improved and designed in the prior art, so it will not be described in detail.

Referring to fig. 2, in order to facilitate the thorough stirring of the mixture introduced from the size mixing tank 2, the re-sizing tank 9 and the lime milk circulation tank, stirring components are respectively arranged on the size mixing tank 2, the re-sizing tank 9 and the lime milk circulation tank 12; more specifically, the stirring assembly includes a motor, a stirring shaft 29, and a stirring paddle 30; the motor is respectively arranged at the upper parts of the size mixing tank 2, the re-sizing tank 9 and the lime milk circulating tank 12, the output shaft of the motor is respectively connected with the size mixing tank 2, the re-sizing tank 9 and the lime milk circulating tank 12 in a rotating way, the output shaft of the motor respectively extends into the size mixing tank 2, the re-sizing tank 9 and the lime milk circulating tank 12 and is connected with the stirring shaft 29 through a coupler, and the stirring shaft 29 is sequentially connected with stirring paddles 30 from top to bottom; when the mixture led in the size mixing tank 2, the re-sizing tank 9 and the lime milk circulation tank is required to be stirred, the rotating motor output shaft drives the stirring paddle 30 to circumferentially rotate through the stirring shaft 29, the circumferentially rotating stirring paddle 30 is used for stirring the mixture led in the size mixing tank 2, the re-sizing tank 9 and the lime milk circulation tank, the mixture is further fully dissolved, and the mixture is prevented from being adhered to a pipeline due to large granularity.

It should be noted that, the motor can be set to the frequency modulation motor, can be according to specific operating mode, the rotational speed of real-time adjustment motor, indirect regulation stirring subassembly stirs the ground and is slow.

Although the utility model has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, drawings and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will be apparent to those skilled in the art.

Claims (10)

1. An phosphogypsum innocent treatment system which is characterized in that: comprises a rotary table filter I (1), a pulp mixing tank (2), a rotary table filter II (3), a washing component I (4), a washing component II (5), a clarifying tank (6) and a filter cloth washing tank (7); the first rotary table filter (1) is connected with the liquid outlet end of the slurry guide pipe (8), and the first rotary table filter (1) is connected with the liquid inlet end of the second rotary table filter (3) through the slurry mixing tank (2); the rotary table filter II (3) is connected with the filter cloth washing tank (7) through the clarifying tank (6), the filter cloth washing tank (7) is connected with the pulp mixing tank (2) through the rotary table filter II (3) and the reslurry tank (9), and the rotary table filter II (3) is respectively connected with the washing component I (4) and the washing component II (5) for removing soluble phosphorus and fluorine.

2. The phosphogypsum innocent treatment system according to claim 1, wherein: the washing component I (4) comprises a circulating conduit (31), a stop valve I (10), a circulating pump (11) and a lime milk circulating tank (12); the pipeline of the circulating conduit (31) is connected with the rotary table filter II (3), the stop valve I (10) is arranged on the pipeline of the circulating conduit (31), and one end of the circulating conduit (31) is communicated with the lime milk circulating tank (12) through the circulating pump (11); the other end of the circulating conduit (31) is communicated with a lime milk circulating groove (12), and a quicklime input port is arranged at the upper part of the lime milk circulating groove (12).

3. The phosphogypsum innocent treatment system according to claim 2, wherein: PH measuring instrument (13) is installed to lime breast circulation groove (12) lateral wall, and PH measuring instrument (13) monitor end is located lime circulation inslot portion, and PH measuring instrument (13) demonstration display end is located lime breast circulation groove outside.

4. The phosphogypsum innocent treatment system according to claim 1, wherein: the second washing component (5) comprises a water guide pipe (14), a cleaning pump (15), a water line for phosphoric acid production and a second stop valve (16); the pipeline of the water guide pipe (14) is connected with the rotary table filter II (3), and one end of the water guide pipe (14) is connected with a water containing tank filled with process water through a water guide pump (17); a second stop valve (16) and a cleaning pump (15) are respectively arranged on the water guide pipe (14), and the other end of the water guide pipe (14) is connected with a water line for phosphoric acid production.

5. The phosphogypsum innocent treatment system according to claim 1, wherein: and the discharge end of the rotary table filter II (3) is connected with a gypsum output line (32), the gypsum output line is arranged as a belt conveyor, and the discharge end of the belt conveyor is positioned in the temporary storage yard.

6. The phosphogypsum innocent treatment system according to claim 1, wherein: the liquid outlet end of the rotary table filter I (1) is communicated with the liquid inlet end of the slurry mixing tank (2) through a slurry guide pipe I (18), the liquid outlet end of the slurry mixing tank (2) is communicated with the lead-in end of the rotary table filter II (3) through a slurry guide pipe II (19) and a slurry pump (20), and the slurry pump (20) is arranged on the pipeline of the slurry guide pipe II (19).

7. The phosphogypsum innocent treatment system according to claim 1, wherein: the leading-out end of the rotary table filter II (3) is communicated with the liquid inlet end of the clarifying tank (6) through a liquid guide pipe I (22) with a filtrate pump (21), and the liquid outlet end of the clarifying tank (6) is communicated with the liquid inlet end of the filter cloth washing tank (7) through an overflow pipe (23).

8. The phosphogypsum innocent treatment system according to claim 7, wherein: the liquid outlet end of the filter cloth washing tank (7) is communicated with the rotary table filter II (3) through a liquid guide pipe II (25) with a washing pump (24), a stop valve III (26) is arranged on a pipeline of the liquid guide pipe II (25), and the other end of the liquid guide pipe II (25) is communicated with the liquid inlet end of the reslurry tank (9).

9. The phosphogypsum innocent treatment system according to claim 8, wherein: the liquid outlet end of the re-slurry tank (9) is communicated with the liquid inlet end of the slurry mixing tank (2) through a liquid guide pipe III (27) and a slurry guide pump (28), and the slurry guide pump (28) is arranged on the liquid guide pipe III (27) pipeline.

10. The phosphogypsum innocent treatment system according to claim 1, wherein: stirring components are respectively arranged on the size mixing tank (2), the re-sizing tank (9) and the lime milk circulating tank (12); the stirring assembly comprises a motor, a stirring shaft (29) and a stirring paddle (30); the motor is respectively arranged at the upper parts of the size mixing tank (2), the re-sizing tank (9) and the lime milk circulating tank (12), the output shaft of the motor is respectively connected with a stirring shaft (29) inside the size mixing tank (2), the re-sizing tank (9) and the lime milk circulating tank (12), and the stirring shaft (29) is sequentially connected with stirring paddles (30) from top to bottom.