CN102390822B

CN102390822B - Method and device for producing phosphoric acid by using tailing eluate

Info

Publication number: CN102390822B
Application number: CN201110231931.9A
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: 2014-02-19
Anticipated expiration: 2031-08-15
Also published as: CN102390822A

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 device and method that tail washing is produced for phosphorus ammonium

Technical field

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

Background technology

As everyone knows, phosphorus ammonium often contains a large amount of dust in producing in the tail gas of the generations such as granulation, drying process, dust is generally by discharging after the facilities such as cyclonic separation, liquid phase washing, sedimentation, and in liquid phase, containing the things such as part nitrogen, phosphorus, the processing of liquid phase affects one of key factor of phosphorus ammonium production often.

In Chinese patent database, the method of comprehensive utilization > > that has number of patent application 201010267565.8 < < wastewater of ammonium phosphate production, 201010247063.9 < < produce exhaust steam the method > > of tails dedusting for phosphorus ammonium, although these patents such as ammonium phosphate production method > > of the emission-free discharge of 200610022018.7 < < provide producing the tail gas of phosphorus ammonium generation or some schemes that waste water is processed, but there is no in prior art, utilize a granular ammonium device tail washing to produce relevant scheme for phosphorus ammonium.

Summary of the invention

Object of the present invention is intended to for the deficiencies in the prior art, provides a kind of method that tail washing is produced for phosphorus ammonium, to realize the recycle of phosphorus ammonium tail washing.

The technical solution used in the present invention is:

The method that tail washing is produced for phosphorus ammonium, the device that it adopts comprises four parts:

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

(2) output of products part: it consists of tablets press, drying machine, returning charge transfer roller, crusher and sieve apparatus, is wherein equipped with phosphor ammonium slurry pump between tablets press and Ι effect flashing chamber;

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

(4) part is washed and recycled to tail: it consists of cycles of washing groove, settling pond and phosphor ammonium slurry receiving tank, wherein cycles of washing groove is equipped with tail and washes recycle pump being connected by pipeline with Venturi scrubber and settling pond respectively, settling pond be equipped with settling pond clear liquid pump and with cycles of washing groove between by pipeline, be connected, settling pond be equipped with settling pond shurry pump and with phosphor ammonium slurry receiving tank between by pipeline, be connected, phosphor ammonium slurry receiving tank is equipped with receiving tank recycle pump and is connected by pipeline with ammoniation reactor.

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

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

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 can carry a part of phosphorus ammonium tail washing lotion to settling pond by tail, and tail washing lotion is clarified in settling pond; Between settling pond and cycles of washing groove, clear liquid pump is installed, clear liquid is above returned phosphorus ammonium tail by clear liquid pump and is washed circulation groove, as tail, washes moisturizing; Between settling pond and phosphor ammonium slurry receiving tank, settling pond shurry pump is installed, the higher slurry (mud) of solid content below settling pond, returns phosphor ammonium slurry receiving tank by settling pond shurry pump; Receiving tank recycle pump is installed between receiving tank and ammoniation reactor, and receiving tank pump is returned ammoniation reactor by slurry and phosphor ammonium slurry by certain proportioning, realizes the recycle of phosphorus ammonium tail washing solid phase (slurry) in phosphorus ammonium is produced.

Employing the present invention have the following advantages:

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

Accompanying drawing explanation

Accompanying drawing is schematic flow sheet of the present invention.

Mark in figure: 1, ammoniation reactor; 2, II effect flashing chamber; 3, Ι effect flashing chamber; 4, phosphoric acid pump; 5, reaction cycle pump; 6, II effect recycle pump; 7, Ι effect 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

Below the present invention is further elaborated:

Embodiment:

Certain factory is used method of the present invention, and the technique of employing and device are as 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 that 15%, N% is 6%, and proportion is 1.25.

The massfraction of raw material used (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 ，Gai factory adopts the present invention that 1,200,000 tons/year of granular ammonium phosphate devices of Traditional Method and 240,000 tons/year of granular ammonium phosphate device tail washings of slurry process are recycled to 480,000 tons of ammonium phosphate of slurry concentration process devices, respond well.

Claims

1. a device of tail washing being produced for phosphorus ammonium, is characterized in that this device comprises four parts:

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

(2) output of products part: it consists of tablets press (9), drying machine (10), returning charge transfer roller (26), crusher (12) and sieve apparatus (11), is wherein equipped with phosphor ammonium slurry pump (13) between tablets press (9) and Ι effect flashing chamber (3);

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

(4) part is washed and recycled to tail: it is by cycles of washing groove (17), settling pond (18) and phosphor ammonium slurry receiving tank (8) form, wherein cycles of washing groove (17) is equipped with tail and washes recycle pump (20) being connected by 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 by pipeline, be connected, settling pond (18) be equipped with settling pond shurry pump (22) and with phosphor ammonium slurry receiving tank (8) between by pipeline, be connected, phosphor ammonium slurry receiving tank (8) is equipped with receiving tank recycle pump (14) and is connected by pipeline with ammoniation reactor (1).

2. one kind is utilized the method that device is produced tail washing for phosphorus ammonium described in claim 1, it is characterized in that described method is by tail, to wash recycle pump (20) to carry a part of phosphorus ammonium tail washing lotion to settling pond (18), tail washing lotion is clarified in settling pond (18); Clear liquid is above returned cycles of washing groove (17) by clear liquid pump (21), as tail, washes moisturizing; Settling pond (18) slurry that solid content is higher is below returned phosphor ammonium slurry receiving tank (8) by settling pond shurry pump (22); Receiving tank recycle pump (14) is returned ammoniation reactor (1) by slurry and phosphor ammonium slurry by certain proportioning, realizes the recycle of phosphorus ammonium tail washing solid phase in phosphorus ammonium is produced; Described settling pond slurry solid content is 5～25%, P ₂o ₅% is that 10～20%, N% is 4～8%, and proportion is 1.15～1.3.