CN102390822A

CN102390822A - Method for producing phosphoric acid by using tailing eluate

Info

Publication number: CN102390822A
Application number: CN2011102319319A
Authority: CN
Inventors: 张晓迁; 张瑞; 陈清宪; 覃庆海; 游光刚
Original assignee: Wengfu Group Co Ltd
Current assignee: Wengfu Group Co Ltd
Priority date: 2011-08-15
Filing date: 2011-08-15
Publication date: 2012-03-28
Anticipated expiration: 2031-08-15
Also published as: CN102390822B

Abstract

The invention discloses a method for producing a phosphoric acid by using a tailing eluate, relating to wastewater recycling. In the method, a tailing eluate circulating pump (20) is arranged between a washing circulating tank (17) and a clarification tank (18); a clear liquid pump (21) is arranged between the clarification tank (18) and the washing circulating tank (17); clear liquid at the upper side returns to the washing circulating tank (17) through the clear liquid pump (21) as a complementing water for tailing eluate; a clarification tank slurry pump (22) is arranged between the clarification tank (18) and an ammonium phosphate slurry collecting tank (8); slurry (sludge) with higher content is formed under the clarification tank (18) and then returns to the ammonium phosphate slurry collecting tank (8) through the slurry pump (22); and a collecting tank circulating pump (14) is arranged between the collecting tank (8) and an ammoniation reactor (1). By adoption of the invention, the purposes of energy saving, emission reduction and circular production are realized, and greater economic benefit is brought for ammonium phosphate enterprises.

Description

The tail washing is used for the method that the phosphorus ammonium is produced

Technical field

The present invention relates to waste water reclamation, relates in particular to the tail washing is used for the method that the phosphorus ammonium is produced.

Background technology

As everyone knows; In the tail gas of generations such as granulation, drying process, often contain amounts of dust in the production of phosphorus ammonium; Dust is generally through discharging behind the facilities such as cyclonic separation, liquid phase washing, sedimentation; And containing things such as part nitrogen, phosphorus in the liquid phase, the processing of liquid phase influences one of key factor of phosphorus ammonium production often.

In the Chinese patent DB; Number of patent application 201010267565.8 " method of comprehensive utilization of wastewater of ammonium phosphate production ", 201010247063.9 " exhaust steam is used for the method that the phosphorus ammonium is produced tails dedusting ", 200610022018.7 " ammonium phosphate production methods of emission-free discharging " are arranged though wait these patents to provide to utilize a granular ammonium device tail washing to be used for the phosphorus ammonium to produce relevant scheme to producing some schemes that tail gas that the phosphorus ammonium produces or waste water are handled, still not having in the prior art.

Summary of the invention

The object of the invention is intended to the deficiency to prior art, provides a kind of the tail washing is used for the method that the phosphorus ammonium is produced, to realize the recycle of phosphorus ammonium tail washing.

The technical scheme that the present invention adopts is:

A kind of the tail washing is used for the method that the phosphorus ammonium is produced, the device that it adopts comprises four parts:

(1) reactive moieties: it is imitated flashing chamber and is connected successively through pipeline by ammoniation reactor, II effect flashing chamber, Ι, and the reaction cycle pump is housed on the ammoniation reactor, and II is imitated II effect recycle pump is housed on the flashing chamber, and Ι is imitated Ι effect recycle pump is housed on the flashing chamber;

(2) product output: it is made up of tablets press, drying machine, returning charge transfer roller, crusher and sieve apparatus, and wherein tablets press and Ι are imitated between the flashing chamber phosphor ammonium slurry pump is housed;

(3) tail gas discharge section: it is made up of tornado dust collector, Venturi scrubber, gravity settling chamber, and wherein tornado dust collector are connected with pipeline between tablets press and the drying machine;

(4) part is washed and recycled to tail: it is made up of cycles of washing groove, settling pond and phosphor ammonium slurry receiving tank; Wherein the cycles of washing groove is equipped with tail and washes recycle pump and being connected through pipeline with Venturi scrubber and settling pond respectively; Settling pond be equipped with the settling pond clear liquid pump and with cleaning circulation pump between be connected through pipeline; Settling pond be equipped with the settling pond shurry pump and with the phosphor ammonium slurry receiving tank between be connected through pipeline, the phosphor ammonium slurry receiving tank is equipped with the receiving tank recycle pump and is connected through pipeline with ammoniation reactor.

Above-mentioned settling pond slurry solid content is 5～25%, P ₂O ₅% is 10～20%, and N% is 4～8%, and proportion is 1.15～1.3.

The massfraction of used raw material (phosphoric acid) is 21%～30% in the aforesaid method.

Design concept of the present invention is in ammonium phosphate production process, between cycles of washing groove and settling pond, tail is installed and washes recycle pump, washes recycle pump through tail and can carry a part of phosphorus ammonium tail washing lotion to settling pond, and the tail washing lotion is clarified in settling pond; Between settling pond and the cycles of washing groove clear liquid pump is installed, top clear liquid is returned phosphorus ammonium tail through clear liquid pump and is washed circulation groove, washes moisturizing as tail; Between settling pond and the phosphor ammonium slurry receiving tank settling pond shurry pump is installed, the higher slurry (mud) of solid content below the settling pond is returned phosphor ammonium slurry manufacturing installation receiving tank through the settling pond shurry pump; The receiving tank recycle pump is installed between receiving tank and the ammoniation reactor, and the receiving tank pump is returned ammoniation reactor with slurry and phosphor ammonium slurry by certain proportioning, realizes that phosphorus ammonium tail washing solid phase (slurry) realizes recycle in the production of phosphorus ammonium.

Employing the present invention have the following advantages:

(1) tail is washed recycle and realize pure and impure separation through settling pond, clear liquid has reduced device fresh water water withdrawal as the washing tail gas moisturizing; The also corresponding discharging that reduces monoammonium phosphate device waste water.(2) tail is washed recycle and realize pure and impure separation through settling pond, the slurry that solid content is bigger (mud) is recovered in the phosphorus ammonium production system, realizes the solid phase recycle.(3) realized the purpose of energy-saving and emission-reduction cyclic production, enterprise has brought corresponding economic benefit for the phosphorus ammonium.

Description of drawings

Accompanying drawing is a schematic flow sheet of the present invention.

Mark among the figure: 1, ammoniation reactor; 2, II is imitated flashing chamber; 3, Ι is imitated flashing chamber; 4, phosphoric acid pump; 5, reaction cycle pump; 6, II is imitated recycle pump; 7, Ι is imitated recycle pump; 8, phosphor ammonium slurry receiving tank; 9, tablets press; 10, drying machine; 11, sieve apparatus; 12, crusher; 13, phosphor ammonium slurry pump; 14, receiving tank recycle pump; 15, tornado dust collector; 16, Venturi scrubber; 17, cycles of washing groove; 18, settling pool; 19, gravity settling chamber; 20, tail is washed recycle pump; 21, settling pool clear liquid pump; 22, settling pool shurry pump; 23, remove mixing condenser; 24, gas ammonia; 25, phosphoric acid; 26, returning charge transfer roller; 27, emptying; 28, finished product (a granular ammonium).

Embodiment

Do further elaboration in the face of the present invention down:

Embodiment:

Certain factory uses method of the present invention, and the technology of employing and device are like accompanying drawing, and equipment adopts following model

Receiving tank recycle pump: lift 30-40m; Flow: 20-35m ³/ h

Settling pond slurry (mud) pump: lift 30-40m; Flow: 2-10m ³/ h

Settling pond clear liquid transferpump: lift 30-40m; Flow: 20-30m ³/ h

Granular ammonium phosphate washing tail gas recycle pump: lift 30-40m; Flow: 20-30m ³/ h

Settling pond slurry solid content is 20%, P ₂O ₅% is 15%, and N% is 6%, and proportion is 1.25.

The massfraction of used raw material (phosphoric acid) is 28%.

The nutrient massfraction of the phosphorus ammonium of producing is N (10%): P ₂O ₅(50%): K ₂O (0%).

In addition, this factory adopts the present invention that 1,200,000 tons of/year granular ammonium phosphate devices of traditional method and 240,000 tons of/year granular ammonium phosphate devices of slurry process tail washing are recycled to 480,000 tons of ammonium phosphate of slurry concentration process devices, and is respond well.

Claims

1. one kind is used for the method that the phosphorus ammonium is produced with the tail washing, it is characterized in that the device that it adopts comprises four parts:

(1) reactive moieties: it is imitated flashing chamber (3) and is connected successively through pipeline by ammoniation reactor (1), II effect flashing chamber (2), Ι; Reaction cycle pump (5) is housed on the ammoniation reactor (1); II is imitated II effect recycle pump (6) is housed on the flashing chamber (2), and Ι is imitated Ι effect recycle pump (7) is housed on the flashing chamber (3);

(2) product output: it is made up of tablets press (9), drying machine (10), returning charge transfer roller (26), crusher (12) and sieve apparatus (11), and wherein tablets press (9) and Ι are imitated between the flashing chamber (3) phosphor ammonium slurry pump (13) is housed;

(3) tail gas discharge section: it is made up of tornado dust collector (15), Venturi scrubber (16), gravity settling chamber (19), and wherein tornado dust collector (15) are connected with pipeline between tablets press (9) and the drying machine (10);

(4) part is washed and recycled to tail: it is to be made up of cycles of washing groove (17), settling pond (18) and phosphor ammonium slurry receiving tank (8); Wherein cycles of washing groove (17) is equipped with tail and washes recycle pump (20) and being connected through pipeline with Venturi scrubber (16) and settling pond (18) respectively; Settling pond (18) be equipped with settling pond clear liquid pump (21) and with cycles of washing groove (17) between be connected through pipeline; Settling pond (18) be equipped with settling pond shurry pump (22) and with phosphor ammonium slurry receiving tank (8) between be connected through pipeline, phosphor ammonium slurry receiving tank dress (8) has receiving tank recycle pump (14) and is connected through pipeline with ammoniation reactor (1).

2. as claimed in claim 1 the tail washing is used for the method that the phosphorus ammonium is produced, it is characterized in that said settling pond slurry solid content is 5～25%, P ₂O ₅% is 10～20%, and N% is 4～8%, and proportion is 1.15～1.3.

3. as claimed in claim 1 the tail washing is used for the method that the phosphorus ammonium is produced, the massfraction that it is characterized in that said raw material (phosphoric acid) is 21%～30%.