Automatic backwashing surface filtering device for dilute phosphoric acid mixed solution and use method of automatic backwashing surface filtering device
An automatic backwashing and surface filtration technology, applied in filtration separation, separation methods, chemical instruments and methods, etc., can solve the problem of inability to separate dilute phosphoric acid solution and fine phosphogypsum solid particles, achieve effective filtration, avoid excessive The effect of secondary start-stop and high-efficiency filtering
Pending Publication Date: 2021-08-17
陕西金禹科技发展有限公司
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[0003] Based on the above defects, the present invention provides a dilute phosphoric acid mixture automatic backwashing surface filter device, which effectively solves the technical problem that dilute phosphoric acid solution cannot be separated from fine phosphogypsum solid particles in the existing wet phosphoric acid production process
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[0022] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.
[0023] In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer" The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The devices or elements referred...
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The invention provides an automatic backwashing surface filtering device for dilute phosphoric acid mixed solution and a use method thereof. The filtering device comprises a tank body, multiple filter elements, a liquid inlet pump, a liquid inlet valve, a circulating valve, a slag discharging valve, a turbid liquid backflow valve, a clear liquid discharging pipe and a backwashing valve. The tank body comprises an upper cavity, a middle cavity and a lower cavity, the multiple filter elements are arranged in the middle cavity, the upper cavity is communicated with the middle cavity through the filter elements, the lower cavity is communicated with the middle cavity, the liquid inlet pump is communicated with the lower cavity through the liquid inlet valve, the slag discharging valve is communicated with the lowest point of the lower cavity, the circulating valve is connected with the liquid inlet pump, the backflushing valve is communicated with the middle cavity, and the turbid liquid return valve is communicated with the upper cavity, and is arranged on the bottom of the upper cavity; the clear liquid discharging pipe is arranged at the upper part of the upper cavity, and is communicated with the upper cavity. The technical problem that a dilute phosphoric acid solution and fine phosphogypsum solid particles cannot be separated in an existing wet-process phosphoric acid production process is effectively solved.
Description
technical field [0001] The invention belongs to the technical field of silica gel filtering with fluosilicic acid mixture, and in particular relates to a surface filtering device for automatic backwashing of dilute phosphoric acid mixture and a use method thereof. Background technique [0002] In the existing wet-process phosphoric acid production process, after phosphoric acid is extracted, its mixed solution is relatively turbid, mainly manifested as: a mixed solution of dilute phosphoric acid and phosphogypsum, and the mixed solution needs to be filtered before dilute phosphoric acid can be concentrated ; The existing filtration method is to separate the slag-liquid through the centrifugal method of turning the disc, but this separation method can only separate the phosphogypsum solids with larger particles, and it is impossible for some tiny particles to form a mixed solution with dilute phosphoric acid. Separated, thereby can not reach the requirement of next step dilut...
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IPC IPC(8): B01D29/15B01D29/52B01D29/68
CPCB01D29/15B01D29/52B01D29/68
Inventor 王延军
Owner 陕西金禹科技发展有限公司
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