Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for reducing usage amount of fresh water in phosphoric acid by wet process

A technology of wet-process phosphoric acid and fresh water, which is applied in the field of phosphoric acid, can solve the problems of affecting the pumping capacity of vacuum pumps, rapid scaling of vacuum pump impellers, and high impurity content in reclaimed water, so as to achieve good social and economic benefits, reduce the amount of fresh water used, Phosphorus Yield Improvement Effect

Active Publication Date: 2015-04-01
WENGFU (GRP) CO LTD
View PDF4 Cites 2 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for reducing usage amount of fresh water in phosphoric acid by wet process

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for reducing usage amount of fresh water in phosphoric acid by wet process. The method comprises the following steps: adding a ceramic filter, filtering the phosphate concentrate pulp, conveying the dried ore into a pulp tank, allowing the filtered ore pulp to enter an underground tank so as to be conveyed to a water cooling tower by virtue of an underground tank pump, returning one part of vacuum pump cooling water to the water cooling tower for cooling, and conveying the water in the water tank of the water cooling tower to four vacuum pumps in the system by virtue of a water supply pump. With the adoption of the method disclosed by the invention, the current situation that the ore pulp in the factory is low in solid content at present is overcome, the washing ratio of the filtering machine is improved, the usage amount of the fresh water of 60m<3> per hour is reduced, the environmental protection pressure is alleviated, and the washing ratio is improved, so that the phosphorus yield is improved, and the method has good social benefits 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B25/22
Inventor 任兢杨毅刘海
Owner WENGFU (GRP) CO LTD