Wet process phosphoric acid automatic production system

Abstract

The invention provides a wet process phosphoric acid automatic production system which comprises a pulp reservoir, wherein a feeding device and a water supply device are arranged above the pulp reservoir, the pulp reservoir is connected with an extraction tank through a pulp conveying device, a sulfuric acid conveying device is arranged on the extraction tank, the feeding device is provided with a weighing device, the water supply device is provided with a water supply flowmeter, the pulp conveying device is provided with a pulp flowmeter, and the sulfuric acid conveying device is provided with a first dilute sulfuric acid flowmeter; the weighing device, the water supply flowmeter, the pulp flowmeter and the first dilute sulfuric acid flowmeter are connected with a control system. Through moving the whole of an automatic control part forwards, namely automatic material preparing is realized from the position of mineral powder coming out from a ball mill, the content of CaO and impurities of pulp are basically kept constant. Therefore, the accurate preparing of materials, namely the mineral powder, water and sulfuric acid, can be realized by only adopting off-line detection.

Description

technical field [0001] The invention relates to the field of phosphoric acid production, in particular to an automatic wet-process phosphoric acid production system. 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 production of large-scale phosphoric acid production systems in the prior art, due to technical limitations, there is a lack of automated monitoring facilities, and instructions are often passed between people and these instructions are executed. Not only is the labor intensity h...

AI Technical Summary

Problems solved by technology

However, this scheme is relatively complicated, and it is necessary to detect the CaO mass concentration of the input pulp online, otherwise as the pulp ratio changes, the CaO mass concentration of the pulp changes accordingly, and it is difficult to achieve an accurate ratio

However, it is difficult to detect the CaO mass concentration of the input pulp online in industrial applications.

Moreover, the valve opening control is used to accurately proportion the materials, and the control difficulty is relatively high.

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