Sulfuric acid flow-rate control method for dihydrol wet-method phosphoric acid extraction process

A dihydrate wet method and flow control technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the effect of affecting phosphogypsum crystallization and filtration, the inaccuracy of sulfuric acid addition, and the fluctuation of residual sulfuric acid content indicators. and other problems, to achieve the effect of high degree of automation, strong anti-interference ability, and improved energy utilization rate
CN104310367AInactive Publication Date: 2015-01-28HENGYANG NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENGYANG NORMAL UNIV
Publication Date
2015-01-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a sulfuric acid flow-rate control method for a dihydrol wet-method phosphoric acid extraction process. The method comprises the following steps: detecting CaO mass concentration of ore pulp input to a phosphoric acid extract trough, and converting the CaO mass concentration into the consumption amount of sulfuric acid needed by the CaO; detecting impurity mass concentration of the ore pulp input to the phosphoric acid extract trough, and calculating the consumption amount of sulfuric acid needed by the impurities in a fuzzy reasoning manner; adding up the consumption amounts of the sulfuric acid to obtain the total consumption amount of the sulfuric acid; detecting content of sulfuric acid of the ore pulp output from the phosphoric acid extract trough, calculating a correction coefficient, and correcting the total consumption amount of the sulfuric acid by virtue of the correction coefficient; measuring the flow rate of ore pulp input to the phosphoric acid extract trough, and multiplying the corrected total consumption amount of the sulfuric acid by the flow rate of the ore pulp; and converting the multiplication result to a control current signal so as to control the openness of an electric adjusting valve of the flow rate of the input sulfuric acid. By adopting the sulfuric acid flow-rate control method, the stability of technical indexes can be effectively improved, the quality and economic benefit of a final product can be improved, the consumption of the sulfuric acid is reduced, the environmental pollution is reduced, the automation degree is high, and simplicity in operation is achieved.
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Description

technical field

[0001] The invention relates to the field of process control of a phosphoric acid production process, in particular to a sulfuric acid flow control method used in a dihydrate wet phosphoric acid extraction process. 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 phosphoric acid extraction process.

[0003] In the dihydrate wet phosphoric acid extraction process, the phosphoric acid extraction tank is a key equipment for sulfuric acid extraction of phosphoric acid. The two main raw materials input into the phosphoric acid ex...

Claims

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