CN203577610U - Solid-liquid separator for circulated acid liquid in ardealite acid-preparation process - Google Patents
Solid-liquid separator for circulated acid liquid in ardealite acid-preparation process Download PDFInfo
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- CN203577610U CN203577610U CN201320785177.8U CN201320785177U CN203577610U CN 203577610 U CN203577610 U CN 203577610U CN 201320785177 U CN201320785177 U CN 201320785177U CN 203577610 U CN203577610 U CN 203577610U
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Abstract
The utility model discloses a solid-liquid separator for circulated acid liquid in an ardealite acid-preparation process. The solid-liquid separator is characterized in that filters (3) are automatic backflushing surface filters, wherein feeding holes (8), clear liquid holes (7) and slag discharging holes are formed in the automatic backflushing surface filters; a liquid inlet of an acid liquid storage tank (2) is connected with the clear liquid holes (7) of the filters (3); a liquid outlet of the acid liquid storage tank (2) is connected with circulated acid spraying holes (6) and the feeding holes of the filters (3), respectively; the slag discharging holes of the filters (3) are connected with a slurry tank (4). According to the solid-liquid separator, partial circulated acid liquid of circulated dilute acid liquid reenters a circulating system after being subjected to solid-liquid separation by the automatic backflushing surface filters in a flue gas cleaning process, so that the temperature of the circulated acid liquid can be guaranteed to be 36-37 DEG C when the circulated acid liquid enters a drying tower, the closed circulation of the dilute acid is completely achieved, the concentration of SO2 reaches 6.4-6.5% before a conversion process, and the zero discharge of sewage is realized.
Description
Technical field
The utility model relates to a kind of ardealite acid-making process recycle acid solid and liquid separator, belongs to ardealite relieving haperacidity technical field.
Background technology
Ardealite is the industrial residue of phosphoric acid or Phosphate Fertilizer Industry and the discharge of some synthetic detergent industry; Ardealite is canescence more, and what have is yellow and lark, and density is 2.05～2.45g/cm
3, unit weight 0.85 g/cm
3, be a kind of multi-component complex crystals.Under normal conditions, 1 ton of phosphoric acid of wet production, produces 4.5～5.5 tons of ardealites.
If the mode processing of ardealite to store up, had both taken a large amount of soils, caused carrying capacity of environment, to manufacturing enterprise, bring very large financial burden again; The comprehensive utilization of ardealite oneself become restriction phosphate fertilizer industry realize one of key factor of sustainable development.
One of study hotspot of resource to ardealite, utilizes decomposing ardealite SO processed exactly both at home and abroad
2and CaO.This flow process both can fundamentally solve a large amount of ardealites continue store up and recycling, can make again phosphorus ammonium produce in the consumption (without outsourcing acid production with sulphur) in a basic balance of sulfuric acid; From 20 beginnings of the century, just carry out the research of decomposing ardealite producing sulfuric acid and jointly cement processed abroad; The domestic research that utilizes ardealite producing sulfuric acid and jointly cement processed starts from the sixties in 20th century, has realized at present industrialization operation.
The primary raw material of ardealite relieving haperacidity is the waste residue CaSO of Phosphate Fertilizer Industry discharge
4(ardealite) contains a small amount of solubility P simultaneously
2o
5, the impurity such as fluoride, organic matter.Gypsum sulfuric acid processed is decomposed into SO
2and CaO, CaO becomes clinker with the auxiliary material that configure dinectly bruning after decomposition, then grinds into together cement products with composite material, containing SO
2gas extracting sulfuric acid, without solid waste, discharge.
Add the ardealite of the auxiliary materials such as coke and clay, through rotary kiln, form (8 ~ 9%) SO
2flue gas in, contain a large amount of micron order dust, in gas cleaning, adopt the facilities such as electric precipitation and wet process acid washing and spraying, in the purification diluted sulfric acid recycling, contain a large amount of dust, when system temperature is unstable, also can produce coal tar and fail the material such as elemental sulfur dissolving, these material viscosity are large, to solid-liquid separating equipment, require high; There is the poor shortcoming of solid-liquid separation effect in the similar devices such as conventional inclined plate settler, in order to guarantee into SO before conversion
2concentration is 6.2～6.3%, guarantee can normally produce into 36～37 ℃ of sulfuric acid of drying tower temperature, for guaranteeing above technological parameter, existing cooling tower, scrubbing tower have to discharge a part of diluted acid water, newly-increased condensed water maintains into drying tower temperature, needs with realizing qualified discharge with the diluted acid water of discharge in lime stone simultaneously.
Summary of the invention
The technical problems to be solved in the utility model is, provides a kind of and can make the dilute sulfuric acid in acid solution storage pond recycle, and avoids discharge and can make drying tower temperature ardealite acid-making process recycle acid solid and liquid separator up to standard, can overcome the deficiencies in the prior art.
The technical solution of the utility model is: ardealite acid-making process recycle acid solid and liquid separator, it comprises flue gas purification system, acid solution storage pond, filter and mud pit, is connected with dust-laden SO on flue gas purification system
2gas access and recycle acid mouth spray, acid solution storage pond is connected to flue gas purification system lower end, described filter is automatic back-washing surface filter, on automatic back-washing surface filter, be provided with charging aperture, clear liquid mouth and slag-drip opening, the acid solution storage inlet in pond and the clear liquid mouth of filter are connected, and the liquid outlet pipe in acid solution storage pond is connected with the charging aperture of recycle acid mouth spray and filter respectively; The slag-drip opening of filter is connected with mud pit.
Above-mentioned ardealite acid-making process recycle acid solid and liquid separator is, the quantity of filter is more than one, and the charging aperture of more than one filter is connected in series mutually, and clear liquid mouth is connected in series mutually.
Compared with the prior art, the utility model adopts automatic back-washing surface filter to replace existing inclined plate settler, automatic back-washing surface filter can make the part circulation acid solution of the circulation pickle in gas cleaning carry out reentering the circulatory system after liquid-solid separation, can guarantee into 36～37 ℃ of drying tower temperature, and reach diluted acid closed circulation completely, SO before entering to transform
2concentration reaches 6.4～6.5%, has realized sewage zero-discharge.The lime stone consumption of using with waste water in can effectively reducing and the discharge quantity of slag, reduced environmental pollution, obtains considerable Social benefit and economic benefit, and therefore the utility model patent has great innovative significance.
The direct filter acid wastewater of automatic back-washing surface filter, need not add any chemical agent; Good effect of separating solid from liquid, the supernatant solid content after filtration is less than 20 mg/L; Utilize cyclic acid pump pressure feed liquor, operating cost is low; Diluted acid process for purifying flow process is short, efficiency is high, promotes ardealite relieving haperacidity flue gas purifying technique level; Equipment moves automatically, and operating personnel's labour intensity is little; Greatly reduce processing and the discharge fee of dirty sour sewage.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of automatic back-washing surface filter.
The specific embodiment
Concrete technological process is
1. precoating: before filtering, the mixed liquor that contains flyash is squeezed into filter, under the pressure of liquid feeding pump, flyash forms the precoated shet homogeneous, density is moderate on filter membrane surface, and precoating in approximately 600 seconds is complete.
2. filter: pressure (the pipeline pressure 04MPa that utilizes systemic circulation acid pump, it is 0.05 ~ 0.15Pa that filter inlet hydraulic requires) as filter feed liquor hydraulic pressure, the high dilute sulfuric acid solution admittedly that contains is transported to automatic back-washing surface filter, diluted acid clear liquid is through existing precoated shet, enter filter 3 upper shells, along 7 gravity flows of clear liquid mouth, enter system acid solution storage pond 2 immediately, by acid solution spray pump, squeeze into gas cleaning annular spray house steward and reuse; Be filtered the precoated layer such as solid particle in pickle and suspension and filter bag and hold back the compound filter cake of formation.
3. recoil: when filtration reaches certain pressure (resistance), filter 3, via integrated manipulator instruction, enters backwash state, after automatic backwash automatically, the precoated shets such as flyash and dust, tar and a small amount of elemental sulfur etc. that are filtered in diluted acid, be deposited to filter 3 conical lower portion together.
4. deslagging: when the slag inclusion mud of filter 3 conical lower portion runs up to when a certain amount of, bottom valve is opened automatically, and slag inclusion mud enters mud pit 4 automatically from filter 3 bottom slag-drip opening valves.Compound filter cake after recoil hightails filter membrane surface and is deposited to filter conical lower portion, and slime water enters slag field, roasting relieving haperacidity again after air-dry.
5. the filtration of filter, recoil, tapping process are all by integrated manipulator auto-controll operation.
Claims (2)
1. an ardealite acid-making process recycle acid solid and liquid separator, it comprises flue gas purification system (1), acid solution storage pond (2), filter (3) and mud pit (4), on flue gas purification system (1), is connected with dust-laden SO
2gas access (5) and recycle acid mouth spray (6), acid solution storage pond (2) is connected to flue gas purification system (1) lower end, it is characterized in that: described filter (3) is automatic back-washing surface filter, on automatic back-washing surface filter, be provided with charging aperture (8), clear liquid mouth (7) and slag-drip opening, the inlet in acid solution storage pond (2) is connected with the clear liquid mouth (7) of filter (3), and the liquid outlet in acid solution storage pond (2) is connected with the charging aperture (8) of recycle acid mouth spray (6) and filter (3) respectively; The slag-drip opening of filter (3) is connected with mud pit (4).
2. ardealite acid-making process recycle acid solid and liquid separator according to claim 1, it is characterized in that: the quantity of filter (3) is more than one, the charging aperture (8) of more than one filter (3) is connected in series mutually, and clear liquid mouth (7) is connected in series mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320785177.8U CN203577610U (en) | 2013-12-04 | 2013-12-04 | Solid-liquid separator for circulated acid liquid in ardealite acid-preparation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320785177.8U CN203577610U (en) | 2013-12-04 | 2013-12-04 | Solid-liquid separator for circulated acid liquid in ardealite acid-preparation process |
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| Publication Number | Publication Date |
|---|---|
| CN203577610U true CN203577610U (en) | 2014-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320785177.8U Expired - Fee Related CN203577610U (en) | 2013-12-04 | 2013-12-04 | Solid-liquid separator for circulated acid liquid in ardealite acid-preparation process |
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| Country | Link |
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| CN (1) | CN203577610U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104787738A (en) * | 2015-04-29 | 2015-07-22 | 瓮福（集团）有限责任公司 | Purification method of dilute acid in wet-process phosphoric acid production |
-
2013
- 2013-12-04 CN CN201320785177.8U patent/CN203577610U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104787738A (en) * | 2015-04-29 | 2015-07-22 | 瓮福（集团）有限责任公司 | Purification method of dilute acid in wet-process phosphoric acid production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20171204 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |