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A method for reducing the fresh water consumption of wet-process phosphoric acid

A wet-process phosphoric acid and fresh water technology, applied in the field of phosphoric acid, can solve the problems of affecting the pumping capacity of vacuum pump, fast fouling of vacuum pump impeller, high impurity content in reclaimed water, achieve good social and economic benefits, reduce the consumption of fresh water, The effect of improving phosphorus yield

Active Publication Date: 2016-04-13
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the relevant prior art, although reclaimed water (neutral water treated by sewage) is used as the water ring water of the vacuum pump, due to the high content of impurities in the reclaimed water, the water inlet pipe of the vacuum pump water ring water is seriously blocked and the impeller of the vacuum pump is broken. The scale is faster, which affects the pumping capacity of the vacuum pump. Therefore, people are constantly looking for a method that can not only ensure the load of the vacuum pump but also reduce the consumption of fresh water.

Method used

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  • A method for reducing the fresh water consumption of wet-process phosphoric acid

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Embodiment 1

[0016] Example 1: Filter the phosphate concentrate slurry with a solid content of about 60% through a ceramic filter to obtain dry ore and slurry water with a moisture content of ≦12%. The dry ore directly enters the slurry tank to increase the solid content of the slurry, and pumps are used to filter the clarified slurry water sent to the cooling tower.

[0017] The device used includes ceramic filter 1, belt 2, vacuum tank 3, vacuum pump 4 and underground tank pump 6, the dry mine silo of the ceramic filter 1 is connected above the belt, and the filtered ore slurry water is connected to the vacuum tank 3. It is automatically discharged into the underground tank 5 by the liquid level control of the vacuum tank 3, and connected to the cooling tower 7 through the underground tank pump 6. The ceramic filter 1 is equipped with an agitator.

Embodiment 2

[0018] Example 2: Part of the return water of the vacuum pump water ring is transported to the cooling tower through the circulating pump, and then mixed with the slurry water after cooling down. The water supply pump supplies the water for the reaction filtration and the concentration system of the vacuum pump water ring respectively.

[0019] The device adopted comprises a water supply pump 9 and a circulation pump 10, the outlet of the water supply pump 9 is connected to four vacuum pumps of the system; the outlet of the circulation pump 10 is connected to the cooling tower nozzle.

[0020] By adopting the methods of the above two embodiments, the amount of fresh water used in the production of wet-process dihydrate phosphoric acid is controlled, the solid content of the slurry in the slurry tank is increased, and the filtering and washing water is increased, that is, the washing rate of the filter is improved, and the water consumption is reduced. The pressure of environm...

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Abstract

The invention discloses a method for reducing the fresh water consumption of wet-process phosphoric acid. The method is to add a ceramic filter to filter the phosphorus concentrate slurry and then transport the dry ore to the slurry tank, and the filtered slurry water enters the underground tank and is discharged The underground tank is pumped to the cooling water tower, part of the vacuum pump water ring returns water to the cooling water tower for cooling, and the water supply pump transports the water in the water tank of the cooling water tower to the system's four vacuum pumps. After adopting the method of the present invention, the current situation of low solid content of the ore pulp in the present factory is remedied, the washing rate of the filter is increased, the consumption of fresh water of 60 m per hour is reduced, the pressure on environmental protection is alleviated, and the improvement of the washing rate makes the phosphorus yield increase. The improvement has better social and economic benefits.

Description

technical field [0001] The present invention relates to phosphoric acid, and more specifically, to a device for using fresh water of wet-process phosphoric acid. Background technique [0002] As we all know, in the production process of dihydrate wet-process phosphoric acid, a large amount of water is needed as the sealing water of the mechanical pump and the water ring water of the vacuum pump. The water ring water volume of each vacuum pump is 10-15m 3 / h, taking the 300kt / a wet-process phosphoric acid plant as an example, there are 6 vacuum pumps from the reaction to the concentration system, and the total water consumption is 60-90m 3 / h, and most of the production devices directly discharge this part of the water or send it to the sewage treatment plant for treatment, which increases the production cost and sewage treatment cost. [0003] In the relevant prior art, although reclaimed water (neutral water treated by sewage) is used as the water ring water of the vacuum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/22
Inventor 任兢杨毅刘海
Owner WENGFU (GRP) CO LTD