Concentration and flow control method used in recovery of diluted phosphoric acid by virtue of phosphoric ore pulp filter device

A technology of filtering equipment and flow control, applied in the direction of phosphoric acid, phosphorus oxyacid, etc., to achieve the effect of ensuring stability and effective control

Inactive Publication Date: 2015-01-21
HENGYANG NORMAL UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Obviously, traditional processing methods cannot meet this requirement

Method used

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  • Concentration and flow control method used in recovery of diluted phosphoric acid by virtue of phosphoric ore pulp filter device
  • Concentration and flow control method used in recovery of diluted phosphoric acid by virtue of phosphoric ore pulp filter device
  • Concentration and flow control method used in recovery of diluted phosphoric acid by virtue of phosphoric ore pulp filter device

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Embodiment Construction

[0040] like figure 2 As shown, the implementation steps of the method for controlling the concentration and flow of light phosphoric acid recovered by the phosphate rock slurry filtration equipment in this embodiment are as follows:

[0041] 1) Detect the light phosphoric acid P in the light phosphoric acid collection tank of the phosphate rock slurry filtration equipment 2 o 5 Concentration (P of light phosphoric acid in the output pipeline of light phosphoric acid collection tank 2 o 5 Concentration), reaction slurry P 2 o 5 Concentration (P of the reaction slurry in the extraction tank 2 o 5 Concentration) and liquid level height;

[0042] 2) Light phosphoric acid P 2 o 5 Concentration, reaction slurry P 2 o 5 Concentrations are converted into fuzzy sets using preset membership functions and fuzzy reasoning is performed using preset fuzzy rule tables, and the results of fuzzy reasoning are defuzzified to obtain the opening degree of the filtrate acid electric co...

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Abstract

The invention discloses a concentration and flow control method used in recovery of diluted phosphoric acid by virtue of a phosphoric ore pulp filter device. The concentration and flow control method comprises the following implementation steps: detecting a diluted phosphoric acid P2O5 concentration, a reaction slurry P2O5 concentration and the height of a liquid level in a diluted phosphoric acid collection tank of the phosphoric ore pulp filter device; respectively converting the diluted phosphoric acid P2O5 concentration and the reaction slurry P2O5 concentration into a fuzzy set by virtue of a predetermined subordinating degree function, carrying out fuzzy inference and defuzzification calculation by virtue of a predetermined fuzzy rule list to obtain the opening of a filtrate acid electric regulating valve, converting the opening into current signals and inputting to the filtrate acid electric regulating valve; converting the reaction slurry P2O5 concentration and the height of the liquid level into the opening of a diluted phosphoric acid electric regulating valve, converting the opening into current signals and inputting to the diluted phosphoric acid electric regulating valve. By virtue of the concentration and flow control method, the stability of process indexes can be effectively improved, the filtration effect of the reaction slurry is improved, the residual phosphorus in phosphogypsum is decreased and the environmental pollution is reduced, the automation degree is high and the operation is simple and reliable.

Description

technical field [0001] The invention relates to the field of process control of phosphoric acid production technology, in particular to a method for controlling the concentration and flow rate of light phosphoric acid recovered by phosphate rock slurry filtering equipment. Background technique [0002] As an important chemical raw material, phosphoric acid plays a pivotal role in my country's chemical industry. Industrial phosphoric acid is usually obtained by extracting phosphate rock with sulfuric acid, and the by-product calcium sulfate (commonly known as phosphogypsum) is generated. Calcium sulfate dihydrate has the advantages of coarse crystal particles and easy filtration and separation, so phosphoric acid manufacturers generally use dihydrate wet process. In the existing two-water wet process, in order to increase the phosphorus absorption rate of phosphate rock as much as possible, it is usually necessary to use phosphate rock slurry filtration equipment (such as a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18
Inventor 龙祖强张满红杜社会
Owner HENGYANG NORMAL UNIV
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