CN105439185A - Method for producing active CaO added to production line of by-product acidic phosphogypsum by using wetprocess phosphoric acid - Google Patents
Method for producing active CaO added to production line of by-product acidic phosphogypsum by using wetprocess phosphoric acid Download PDFInfo
- Publication number
- CN105439185A CN105439185A CN201410730707.8A CN201410730707A CN105439185A CN 105439185 A CN105439185 A CN 105439185A CN 201410730707 A CN201410730707 A CN 201410730707A CN 105439185 A CN105439185 A CN 105439185A
- Authority
- CN
- China
- Prior art keywords
- phosphogypsum
- phosphoric acid
- product
- facility
- active cao
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The present invention discloses a method for producing active CaO added to a production line of by-product acidic phosphogypsum by using wetprocess phosphoric acid. The method comprises the following steps: setting an active CaO adding port at the position adjacent to a rotary tillage facility direction after third washing of disc filtration in the filtering process of a filtering apparatus of a wetprocess phosphoric acid production apparatus and before rotary tillage; by uniformly adding active CaO to the surface of phosphogypsum on the disc, using a rotary tillage delivery facility, an unloading facility and a delivery transport facility to automatically carry out uniform mixing and stirring; and converting harmful by-product acidic phosphogypsum into by-product alkalescence phosphogypsum. According to the method, active CaO is added into a disc filter in the production line by using the wetprocess phosphoric acid to produce by-product acidic phosphogypsum, so that by-product alkaline phosphogypsum is produced; and the method is small in occupation, low in investment and low in operating cost, and the production line for producing by-product acidic phosphogypsum by using the wetprocess phosphoric acid in the prior art can be directly adopted, so that the cost of factories is greatly reduced.
Description
Technical field
The present invention relates to a kind of method utilizing the production line of the acid phosphogypsum of Wet-process Phosphoric Acid Production by-product to add active CaO, belong to chemical industry just dirty technical field.
Background technology
In current prior art the charging process of the mixing of material be all adopt prepare respectively respectively add compound after be delivered to respective feed bin, after metering system metering, add material mixing agitator stir and make it fully react, the process that the reinforced blending means of this conventional ripening is applied in phosphogypsum exists following problem (problem mainly during post-processed acid phosphorus gypsum): occupied ground is large; Construction investment is large; Running cost is high; The amount of process phosphogypsum is limited.
Summary of the invention
The object of the invention is: a kind of method utilizing the production line of the acid phosphogypsum of Wet-process Phosphoric Acid Production by-product to add active CaO is provided, the method take up an area little, reduced investment, running cost are low and the noxious acidic phosphogypsum 100% of former by-product can be made to transform into the Adding Way of the CaO of by-product weakly alkaline phosphogypsum, thus overcome the deficiencies in the prior art.
Technical scheme of the present invention
The production line of the acid phosphogypsum of Wet-process Phosphoric Acid Production by-product is utilized to add the method for active CaO, the disc type of the filter progress of the filtration unit of wet-process phosphoric acid production plant filter three wash after, before rotary tillage, an active CaO is set near the position in rotary tillage facility direction and adds entrance, by active CaO evenly being added the upper phosphogypsum surface of dish, utilize rotary tillage conveying facility, blanking facility and conveying transportation facilities automatically to complete to uniformly mix, and make by-product noxious acidic phosphogypsum change into by-product weakly alkaline phosphogypsum.
Owing to adopting technique scheme, compared with prior art, the present invention adds active CaO by the disk filter of the production line at the acid phosphogypsum of existing Wet-process Phosphoric Acid Production by-product, thus production has weakly alkaline by-product phosphogypsum, and (the by-product phosphogypsum of this alkalescence is little to environmental influence, simultaneously by adding active CaO, secondary pollution can not be produced), the present invention not only take up an area little, reduced investment, running cost are low, and directly can adopt the production line of the acid phosphogypsum of the Wet-process Phosphoric Acid Production by-product of prior art, greatly reduce the cost of factory.
Embodiment
The present invention is described in further detail below, but not as any limitation of the invention.
Embodiments of the invention: a kind of method utilizing the production line of the acid phosphogypsum of Wet-process Phosphoric Acid Production by-product to add active CaO, the disc type of the filter progress of the filtration unit of wet-process phosphoric acid production plant filter three wash after, before rotary tillage, an active CaO is set near the position in rotary tillage facility direction and adds entrance, by active CaO evenly being added the upper phosphogypsum surface of dish, utilize rotary tillage conveying facility, blanking facility and conveying transportation facilities automatically to complete to uniformly mix, and make by-product noxious acidic phosphogypsum change into by-product weakly alkaline phosphogypsum.
Specific implementation process
The present embodiment comprises a set of filtering table, a set of rotary tillage facility, the blanking facility of a set of phosphogypsum, a set of phosphogypsum conveying facility (above-mentioned facility is all the Each part of existing wet-process phosphoric acid production plant) and coal addition position (i.e. active CaO add entrance), and described filtering table is that the filtering table of the filter progress of wet-process phosphoric acid production plant shares; Described rotary tillage facility be the filter progress of wet-process phosphoric acid production plant disk filter on rotary tillage facility share; Described phosphogypsum blanking facility exports through rotary tillage the facility adding belt conveyor to share: described phosphogypsum conveying facility is that phosphogypsum belt conveyor and transportation facilities share; Described coal addition position is near the position in rotary tillage facility direction after three of the disc type filtration of the filter progress of the filtration unit of wet-process phosphoric acid production plant is washed, before rotary tillage; When Wet-process Phosphoric Acid Production system cloud gray model, the proportion of the phosphogypsum thickness on the running speed of disk filter, disk filter, the scantlings of the structure of dish, phosphogypsum, pH value, moisture content and water-soluble phosphorus, fluorine equal size are metastable.The amount of active CaO is added needed for calculating according to aforementioned stable value, evenly add the upper phosphogypsum surface of dish, utilize rotary tillage conveying facility, blanking facility and conveying transportation facilities automatically to complete to uniformly mix, and make by-product noxious acidic phosphogypsum change into by-product weakly alkaline phosphogypsum.
The principle of design of the present embodiment
The weakly alkaline phosphogypsum of resource utilization not changing the raw material (active CaO) of phosphogypsum physicochemical property, a set of principal reaction principle, a kind for the treatment of effect and generate, principal reaction principle is;
①CaO＋H
2O=Ca
＋2＋2OH
－
②OH
－＋H
＋=H
2O
③3Ca
＋2＋2PO
4 －3=Ca
3(PO
4)
2↓
④Ca
＋2＋2F
—=CaF
2↓
⑤3Ca(PO
4)
2＋CaF
2=2Ca
5F(PO
4)
3
Described treatment effect adds amount of lime to be enough to make the pH value of acid phosphorus gypsum become 8 ~ 9 from 3 ~ 4, and the transformation efficiency that water-soluble phosphorus, fluorine, arsenic and the molten thing of other harmful water are converted into water-insoluble is greater than 99.5%; The weakly alkaline phosphogypsum of described resource utilization is that the phosphogypsum after adding active CaO process detects through GB5086.2-1997 the indirect emission limit that its all index reaches GB15580-2011 table 2, and the noxious acidic phosphogypsum 100% that Wet-process Phosphoric Acid Production system is produced changes into the harmless gypsum resource that can stack arbitrarily and is convenient to comprehensive utilization.
Add amount of lime (can determine to measure toward each other according to chemical equation) according to moisture content, water-soluble phosphorus content and dissolved fluorine cubage in phosphogypsum, lime is added mixing and stirring in wet basis phosphogypsum, the active CaO in lime and water react and generate Ca
+ 2and OH
-; Wherein OH
-with the H in phosphogypsum
+water generation reaction; The pH value of phosphogypsum is made to be promoted to 8 ~ 9 by 3 ~ 4, and Ca
+ 2then respectively with the water-soluble PO in phosphogypsum
4 -3with water-soluble F
-the Ca of water generation reaction insolubles
3(PO
4)
2and CaF
2; The Ca generated
3(PO
4)
2and CaF
2be combined into Ca being uniformly mixed in process
5f (PO
4)
3; Objectionable constituent are finally made to be reduced to harmless fluorapatite.
Claims (1)
1. utilize the production line of the acid phosphogypsum of Wet-process Phosphoric Acid Production by-product to add the method for active CaO, it is characterized in that: the disc type of the filter progress of the filtration unit of wet-process phosphoric acid production plant filter three wash after, before rotary tillage, an active CaO is set near the position in rotary tillage facility direction and adds entrance, by active CaO evenly being added the upper phosphogypsum surface of dish, utilize rotary tillage conveying facility, blanking facility and conveying transportation facilities automatically to complete to uniformly mix, and make by-product noxious acidic phosphogypsum change into by-product weakly alkaline phosphogypsum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410730707.8A CN105439185A (en) | 2014-12-05 | 2014-12-05 | Method for producing active CaO added to production line of by-product acidic phosphogypsum by using wetprocess phosphoric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410730707.8A CN105439185A (en) | 2014-12-05 | 2014-12-05 | Method for producing active CaO added to production line of by-product acidic phosphogypsum by using wetprocess phosphoric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105439185A true CN105439185A (en) | 2016-03-30 |
Family
ID=55549906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410730707.8A Pending CN105439185A (en) | 2014-12-05 | 2014-12-05 | Method for producing active CaO added to production line of by-product acidic phosphogypsum by using wetprocess phosphoric acid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105439185A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1453234A (en) * | 2002-04-27 | 2003-11-05 | 刘茂平 | Ardealite curing modification process |
| CN102731001A (en) * | 2012-07-25 | 2012-10-17 | 广西鹿寨凯浩鹿宝新型建材有限公司 | Phosphogypsum composite pretreatment technique |
-
2014
- 2014-12-05 CN CN201410730707.8A patent/CN105439185A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1453234A (en) * | 2002-04-27 | 2003-11-05 | 刘茂平 | Ardealite curing modification process |
| CN102731001A (en) * | 2012-07-25 | 2012-10-17 | 广西鹿寨凯浩鹿宝新型建材有限公司 | Phosphogypsum composite pretreatment technique |
Non-Patent Citations (1)
| Title |
|---|
| 丁萌等: "磷石膏中杂质及预处理对α半水石膏性能的影响", 《环境工程学报》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102701171B (en) | Production method of feed-grade granular calcium hydrogen phosphate III-type product | |
| CN102731006B (en) | Phosphogypsum cement retarder and preparation method | |
| CN102320763B (en) | Phosphogypsum purification and neutralization apparatus | |
| CN103058738B (en) | Method for preparing phosphate fertilizer soil conditioner by using phosphate tailings and acidic wastewater | |
| CN100404412C (en) | Method for producing feed grade dicalcium phosphate | |
| CN105217592A (en) | The production method of the granular monocalcium phosphate of feed grade | |
| CN108910853B (en) | Method for producing granular calcium dihydrogen phosphate by one-step granulation of concentrated phosphoric acid | |
| CN103113139A (en) | Method for producing multivariate nitro compound fertilizer from wet-process phosphoric acid purification sludge | |
| CN102689883A (en) | Method for producing diammonium phosphate from recycled phosphorus-containing filter residues | |
| CN101486596B (en) | Agricultural magnesium sulphate fertilizer and preparation thereof | |
| CN104261900A (en) | Method for producing magnesium ammonium phosphate fertilizer by utilizing phosphoric acid sludge through wet process | |
| CN104140088A (en) | Method for producing fertilizer-level monoammonium phosphate through fertilizer-level calcium hydrophosphate | |
| CN103435024A (en) | Method for producing feed grade calcium hydrophosphate | |
| CN205367732U (en) | Fodder level calcium dihydrogen phosphate apparatus for producing | |
| CN202508882U (en) | Device for preparing feed grade calcium phosphate dibasic through acid waste water | |
| CN102786042A (en) | Method for utilizing underflow sludge acid with high solid phosphorus ratio | |
| CN104261898B (en) | A kind of improve the method for water-soluble phosphorus content in fertilizer grade calcium hydrogen phosphate | |
| CN105439185A (en) | Method for producing active CaO added to production line of by-product acidic phosphogypsum by using wetprocess phosphoric acid | |
| CN102897731A (en) | Method for producing low-nutrient ammonium phosphate by utilizing water in phosphoric acid tank | |
| CN104003823B (en) | A kind of method utilizing low-grade phosphate ore to produce nutrient type acid soil amendment | |
| CN104495775A (en) | Method for producing feed-grade monocalcium phosphate | |
| CN105347321A (en) | Method for producing ammonium phosphate by using low-grade low-concentration raffinate acid | |
| CN102745659A (en) | Method for preparing powdery ammonium dihydrogen phosphate | |
| CN101913571A (en) | Technological process for producing calcium superphosphate by using low-grade phosphate ores | |
| CN104355681A (en) | Method for producing triple superphosphate by employing fertilizer-grade dicalcium phosphate as raw material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160330 |
|
| RJ01 | Rejection of invention patent application after publication |