Continuous discharging system for iron phosphate washing

Abstract

The utility model discloses a continuous discharging system for washing iron phosphate, which relates to the technical field of production and processing of iron phosphate and comprises a first filter, a second filter, a third filter, a slurrying kettle, a fourth filter, a fifth filter, a sixth filter, a vacuum belt dehydrator, a drying and sintering device and a washing water recycling device. The discharging end of the first filter is fixedly connected with the feeding end of the second filter, and the discharging end of the second filter is fixedly connected with the feeding end of the third filter. According to the utility model, the problem that one filter pressing period of a plate-and-frame filter press needs 2-4 hours of pause time is solved in a continuous washing and filtering manner, the continuous discharging effect is achieved, the subsequent dry flower roasting equipment can continuously work, the production efficiency can be greatly improved, and meanwhile, the problem of the plate-and-frame filter pressing manner is solved; the problems of high water washing difficulty and high water consumption of pressed solid mud cakes are solved, the water consumption is reduced, and meanwhile, the cost of iron phosphate products is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to phosphorus acid iron production processing technical field, concretely relates to a kind of for phosphorus acid iron water washing continuous discharge system. BACKGROUND

[0002] Phosphorus acid iron is an important inorganic chemical raw material, and is widely used in battery, chemical industry, metallurgy, electronics, pharmaceutical and other industries. The production of phosphorus acid iron usually adopts wet process, which mainly includes two steps: preparation of phosphorus acid iron solution and precipitation of phosphorus acid iron salt. First, phosphorus acid iron solution is prepared by reacting iron powder or iron alloy with acid. Then, phosphorus acid iron salt is prepared by reacting phosphorus acid iron solution with phosphoric acid. The phosphorus acid iron salt is separated by filtration or centrifugation to obtain the precipitate of phosphorus acid iron salt, which is then dried and calcined to obtain the phosphorus acid iron product. In order to reduce the impurity content of the phosphorus acid iron product and improve its competitiveness in the market, it is crucial to wash the phosphorus acid iron product to remove impurities and improve its purity and quality. The phosphorus acid iron washing step mainly includes two main processes: precipitation filtration and washing. In the production process of phosphorus acid iron, ferrous sulfate is used as the raw iron salt, and phosphoric acid and monoammonium phosphate are used as the raw phosphorus salt. After heating and reacting in a kiln, dihydrate phosphorus acid iron precipitate is formed. A certain amount of mother liquor is produced in this process, which is a high-concentration wastewater. After washing, the product obtained by precipitation filtration produces a relatively low-concentration washing water. The washing process usually includes the following two steps: precipitation filtration: to remove impurities and unreacted raw materials produced in the production process of phosphorus acid iron, and to form relatively pure phosphorus acid iron precipitate; washing: to remove impurities and mother liquor attached to the surface of phosphorus acid iron by washing the precipitate with water, and to obtain relatively pure phosphorus acid iron product.

[0003] The existing water washing process uses a plate and frame filter press for solid-liquid separation and washing. Because the plate and frame filter press is a periodic filtration and discharge, it causes discontinuity of the discharge, making it difficult to continuously dry and sinter the subsequent process. Because the plate and frame filter press requires 2-4 hours for one filtration cycle, and the water washing time requires 45 minutes of high-volume water washing (70-90 tons / ton of product), a large amount of cleaning water is consumed, resulting in water washing cost accounting for 15-20% of the cost of phosphorus acid iron product. SUMMARY

[0004] The purpose of the utility model is to provide a phosphorus acid iron water washing continuous discharge system to solve the problems raised in the background art.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A kind of for iron phosphate water washing continuous discharge system, including filter No.1, filter No.2, filter No.3, slurry tank, filter No.4, filter No.5, filter No.6, vacuum belt dewaterer, dry sintering device and washing water recycling device, the discharge end of filter No.1 is fixedly connected with the feed end of filter No.2, the discharge end of filter No.2 is fixedly connected with the feed end of filter No.3, the discharge end of filter No.3 is fixedly connected with the feed end of slurry tank, the washing water output end of filter No.3 is fixedly connected with the washing water input end of filter No.2, the washing water output end of filter No.2 is fixedly connected with the washing water input end of filter No.1, the washing water output end of filter No.1 is fixedly connected with the input end of washing water recycling device, the discharge end of slurry tank is fixedly connected with the feed end of filter No.4, the discharge end of filter No.4 is fixedly connected with the feed end of filter No.5, the discharge end of filter No.5 is fixedly connected with the feed end of filter No.6, the output end of washing water recycling device is fixedly connected with the washing water input end of filter No.6, the washing water output end of filter No.6 is fixedly connected with the washing water input end of filter No.5, the washing water output end of filter No.5 is fixedly connected with the washing water input end of filter No.4, the washing water output end of filter No.4 is fixedly connected with the input end of washing water recycling device.

[0007] Preferably, the vacuum belt dewaterer is used for continuous dewatering treatment to the material of the discharge end of filter No.6, and the dry sintering device is used for continuous drying treatment to the material of the discharge end of the vacuum belt dewaterer.

[0008] Preferably, filter No.1, filter No.2, filter No.3, filter No.4, filter No.5 and filter No.6 all adopt ceramic filter tube as filter element.

[0009] Preferably, the discharge end of filter No.1, filter No.2, filter No.3, slurry tank, filter No.4, filter No.5 and filter No.6 are all provided with star unloader.

[0010] Preferably, the feed end of the slurry tank is fixedly connected with phosphoric acid supplement pipeline.

[0011] Due to the adoption of the above technical scheme, the technical progress achieved by the present application relative to the prior art is:

[0012] The utility model provides a kind of for phosphatic iron water washing continuous discharging system, to solve the problem of existing system discharging cannot continuously carry out and water consumption is larger.Overcome the problem that the plate-and-frame filter press is 2-4 hours pause time in a filter pressing cycle by the way of continuous water washing filtration, reach continuous discharging effect, can make subsequent dry flower calcination equipment continuous work, can greatly improve production efficiency, simultaneously solve the problem that plate-and-frame filter press is difficult, water consumption is large after pressing solid mud cake water washing, reduce water consumption, reduce the cost of iron phosphate product simultaneously, the system can also be applied in desulfurization and denitrification, sludge treatment, solid waste treatment, steel plant dust, iron oxide scale etc. In the field of conveying and distributing material, emergency emptying etc. In pelletizing process, have higher practicality. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structure flow schematic diagram of the utility model system.

[0014] In the drawing: 1, filter No. 1; 2, filter No. 2; 3, filter No. 3; 4, slurry kettle; 5, filter No. 4; 6, filter No. 5; 7, filter No. 6; 8, vacuum belt dehydrator; 9, dry sintering device; 10, washing water recycling device. DETAILED DESCRIPTION

[0015] The utility model is further explained in detail as follows in combination with embodiment:

[0016] As Figure 1The utility model provides a kind of for iron phosphate water washing continuous discharging system, including filter No.1 1, filter No.2 2, filter No.3 3, slurry kettle 4, filter No.4 5, filter No.5 6, filter No.6 7, vacuum belt dewaterer 8, dry sintering device 9 and washing water recycling device 10, the discharge end of filter No.1 1 is fixedly connected with the feed end of filter No.2 2, the discharge end of filter No.2 2 is fixedly connected with the feed end of filter No.3 3, the discharge end of filter No.3 3 is fixedly connected with the feed end of slurry kettle 4, the washing water output end of filter No.3 3 is fixedly connected with the washing water input end of filter No.2 2, the washing water output end of filter No.2 2 is fixedly connected with the washing water input end of filter No.1 1, the washing water output end of filter No.1 1 is fixedly connected with the input end of washing water recycling device 10, the discharge end of slurry kettle 4 is fixedly connected with the feed end of filter No.4 5, the discharge end of filter No.4 5 is fixedly connected with the feed end of filter No.5 6, the discharge end of filter No.5 6 is fixedly connected with the feed end of filter No.6 7, the output end of washing water recycling device 10 is fixedly connected with the washing water input end of filter No.6 7, the washing water output end of filter No.6 7 is fixedly connected with the washing water input end of filter No.5 6, the washing water output end of filter No.5 6 is fixedly connected with the washing water input end of filter No.4 5, the washing water output end of filter No.4 5 is fixedly connected with the input end of washing water recycling device 10, first, phosphoric acid+ sodium hydroxide, clear ferrous sulfate, hydrogen peroxide raw materials are mixed and added into filter No.1 1, filtrate is filtered after being filtered by filter element and is discharged from the top of filter No.1 1, and the solid precipitation of iron phosphate generated by reaction is blocked by filter element, and after being increased in size on the surface of filter element, it falls and deposits to the bottom of filter No.1 1, then can be discharged to the next filter, and the solid precipitation of iron phosphate is discharged from the upper filter and enters the lower filter, and is filtered layer by layer to the last filter, and washing water enters the last filter and washes the solid precipitation of iron phosphate, and then is discharged from the upper part of filter and enters the upper filter, and the solid precipitation of iron phosphate is filtered layer by layer, and impurities are removed, and higher quality product is obtained, and washing water flows reversely, and is gradually concentrated and then is discharged to washing water recycling device 10 for treatment and then is reused to the system, by adopting the mode of continuous water washing and filtering, the problem that the plate-and-frame filter press needs to be stopped for 2-4 hours in a filter pressing cycle is overcome, the effect of continuous discharging is achieved, the subsequent dry flower calcination equipment can work continuously, the production efficiency can be improved by 20%, the problem of large water consumption and great difficulty in water washing of solid mud cake after pressing is solved, the water washing amount is reduced from 70-90 tons / ton product to 30-45 tons / ton product, the water washing cost is reduced from 15-20% of the cost of iron phosphate product to 5-10%, and the system can also be applied in the fields of conveying and distributing in pelletizing process of desulfurization and denitrification, sludge treatment, solid waste treatment, dust removal ash of steel plant, iron oxide skin and emergency emptying.

[0017] Further, as Figure 1As shown, the vacuum belt dewatering machine 8 is used for continuous dewatering treatment of the material at the discharge end of the sixth filter 7, the drying and sintering device 9 is used for continuous drying treatment of the material at the discharge end of the vacuum belt dewatering machine 8, the feed end of the slurry tank 4 is fixedly connected with a phosphoric acid supplement pipeline, the acid iron solid precipitate after the completion of the first cleaning and filtration enters the slurry tank 4, and after the addition of phosphoric acid and the reaction, enters the second washing process section, and the above-mentioned first washing and filtration process is recycled, and the acid iron solid precipitate after the completion of the second washing is continuously dewatered by the vacuum belt dewatering machine 8 and then enters the next stage of the drying and sintering device 9 for treatment.

[0018] Further, as shown in the drawings, Figure 1 The first filter 1, the second filter 2, the third filter 3, the fourth filter 5, the fifth filter 6 and the sixth filter 7 all adopt ceramic filter tubes as filter elements, so that the design can withstand the high temperature of the synthetic feed, withstand the high solid content abrasion, and the feed end of the slurry tank 4 is fixedly connected with a phosphoric acid supplement pipeline, so that continuous discharge can be realized while ensuring excellent solid content.

[0019] Now, the working principle of the phosphoric acid iron washing continuous discharge system will be described in detail.

[0020] As shown in the drawings, Figure 1 First, the raw materials of phosphoric acid + sodium hydroxide, clarified ferrous sulfate and hydrogen peroxide are mixed and added to the first filter 1, the filtrate is discharged from the top of the first filter 1 after being filtered by the filter element, the phosphoric acid iron solid precipitate generated by the reaction is blocked by the filter element, and after the increase of the condensation crystal nucleus on the surface of the filter element, it falls and deposits to the bottom of the first filter 1, and then is discharged to the next filter, the phosphoric acid iron solid precipitate is discharged from the upper filter and enters the lower filter, and the washing water is discharged from the upper part of the filter after washing the phosphoric acid iron solid precipitate and enters the upper filter, the washing water flows in the opposite direction, gradually increases in concentration and is discharged to the washing water recycling device 10 for treatment and then reused to the system, the acid iron solid precipitate after the completion of the first cleaning and filtration enters the slurry tank 4, and after the addition of phosphoric acid and the reaction, enters the second washing process section, and the above-mentioned first washing and filtration process is recycled, and the acid iron solid precipitate after the completion of the second washing is continuously dewatered by the vacuum belt dewatering machine 8 and then enters the next stage of the drying and sintering device 9 for treatment.

[0021] It should be pointed out that in the description of the present disclosure, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the present disclosure can be understood according to the specific circumstances.

[0022] The utility model has made the detailed description above generally, but can make some modification or improvement to it on the basis of the utility model, and this is obvious to the general skilled person in the technical field. Therefore, the modification or improvement without departing from the utility model thought spirit, all are within the protection scope of the utility model.

Claims

1. A continuous discharge system for iron phosphate water washing, characterized in that: The device comprises a first filter, a second filter, a third filter, a slurry tank, a fourth filter, a fifth filter, a sixth filter, a vacuum belt dewatering machine, a drying and sintering device and a washing water recycling device, the discharge end of the first filter is fixedly connected with the feeding end of the second filter, the discharge end of the second filter is fixedly connected with the feeding end of the third filter, the discharge end of the third filter is fixedly connected with the feeding end of the slurry tank, the washing water output end of the third filter is fixedly connected with the washing water input end of the second filter, the washing water output end of the second filter is fixedly connected with the washing water input end of the first filter, the washing water output end of the first filter is fixedly connected with the input end of the washing water recycling device, the discharge end of the slurry tank is fixedly connected with the feeding end of the fourth filter, the discharge end of the fourth filter is fixedly connected with the feeding end of the fifth filter, the discharge end of the fifth filter is fixedly connected with the feeding end of the sixth filter, the output end of the washing water recycling device is fixedly connected with the washing water input end of the sixth filter, the washing water output end of the sixth filter is fixedly connected with the washing water input end of the fifth filter, the washing water output end of the fifth filter is fixedly connected with the washing water input end of the fourth filter, and the washing water output end of the fourth filter is fixedly connected with the input end of the washing water recycling device.

2. The continuous discharge system for iron phosphate water washing according to claim 1, characterized in that: The vacuum belt dewatering machine is used for continuously dewatering the material at the discharge end of the sixth filter, and the drying and sintering device is used for continuously drying the material at the discharge end of the vacuum belt dewatering machine.

3. The system for continuous discharge of iron phosphate water washing according to claim 1, characterized in that: The first filter, the second filter, the third filter, the fourth filter, the fifth filter and the sixth filter all adopt ceramic filter tubes as filter elements.

4. The system for continuous discharge of iron phosphate water washing according to claim 1, characterized in that: The discharge end of the first filter, the second filter, the third filter, the fourth filter, the fifth filter and the sixth filter is provided with a star-shaped discharger.

5. The system for continuous discharge of iron phosphate water washing according to claim 1, characterized in that: The feeding end of the slurry tank is fixedly connected with a phosphoric acid supplement pipeline.

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