CN1043213C - Method for extracting phosphoric acid by hydrochloric acid method - Google Patents
Method for extracting phosphoric acid by hydrochloric acid method Download PDFInfo
- Publication number
- CN1043213C CN1043213C CN94111777A CN94111777A CN1043213C CN 1043213 C CN1043213 C CN 1043213C CN 94111777 A CN94111777 A CN 94111777A CN 94111777 A CN94111777 A CN 94111777A CN 1043213 C CN1043213 C CN 1043213C
- Authority
- CN
- China
- Prior art keywords
- phosphoric acid
- hydrochloric acid
- acid
- extraction
- phosphate rock
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The present invention belongs to a method for preparing extracted phosphoric acid by using a hydrochloric acid method, which comprises the following steps: the produced extracted phosphoric acid in the flow is utilized to preprocess phosphate rock powder in order to remove carbonate and free hydrochloric acid in the phosphonic acid; then the clarifying procedure is carried out, and supernatant fluid is the goal object; the extractive reaction is carried out on lower layer thick paste and the hydrochloric acid, and thereby, the extracted phosphoric acid is obtained; then the extracted phosphoric acid is clarified; the supernatant fluid is transferred to a reactive tank, and the initial program is repeated, but the lower layer acid sludge is transferred to a separator and is discharged after being separated. Because the present invention preprocesses the raw material mineral powder, the content of the carbonate in the mineral powder is reduced, and the grade of the raw material is increased. Consequently, the consumption of the hydrochloric acid can be reduced by 28 to 30%, and the production cost is reduced.
Description
The invention belongs to a kind of method that adopts extracting phosphoric acid by hydrochloric acid method, this phosphoric acid extraction as raw material, both can be used for producing calcium hydrogen phosphate fodder, also can be used for producing other phosphoric acid salt.
At present, during at home, outer wet method calcium hydrogen phosphate fodder is produced, many direct decomposing rock phosphate with hydrogen of hydrochloric acid that adopt are to obtain phosphoric acid extraction, and with this as intermediate raw material after defluorinate is handled, add calcium hydroxide again or precipitation of calcium carbonate goes out calcium hydrogen phosphate fodder, then its oven dry is promptly got feed Thomas flour product." development of fodder additives secondary calcium phosphate " as the third phase record of " Central China Normal University's journal " 1987 the 21st volumes is exactly this method that adopts.Advantages such as production unit is simple though this method has in obtaining the technology of phosphoric acid extraction, technical process is short.But because directly by the decomposing phosphate rock by chlorhydric acid powder, must add excessive hydrochloric acid just can reach best percentage extraction, and owing to ground phosphate rock itself contains a large amount of carbonate impurity, these impurity also will consume a large amount of hydrochloric acid in reaction process.Therefore, this method exists hydrochloric acid consumption height, thereby has influenced fraud disadvantages such as economic benefit raising.
The objective of the invention is on the basis of background technology, to improve the technical process that it produces phosphoric acid extraction,, improve purposes such as its economic benefit to reach the consumption that reduces hydrochloric acid.
Solution of the present invention is at first to utilize the phosphoric acid extraction of producing out in this technical process that raw material ground phosphate rock is carried out pre-treatment, with remove wherein carbonate and the free hydrochloric acid of phosphoric acid extraction, add then flocculation agent and through the clarification after, supernatant liquid is stored as object input storagetank, the thick slurry that ground phosphate rock is rich in lower floor is sent into extraction tank and is carried out extractive reaction to produce phosphoric acid extraction with hydrochloric acid again, reacted slip is after clarification, supernatant liquid is sent into decomposer repetition initial program as phosphoric acid extraction the raw material breeze is carried out pre-treatment, and its bottom acid sludge is drained after separating.Its pretreated reaction principle is in the such scheme:
Because of the molecular formula of pure fluorapatite in the raw material ground phosphate rock is Ca
5F (PO
4)
3, its CaO/P
2O
5Ratio is 1.32.Yet since the increase of the replacement amount of carbonate, the CaO/P in the commodity ground phosphate rock
2O
5Ratio usually between 1.45～1.70, its molecular formula can be written as Ca usually
5F (PO
4)
3NRCO
3MH
2O (R is Ca or Mg etc. in the formula).Therefore, comprehensively above-mentioned (1), (2) reaction formula, but its net reaction tabular form is:
Like this, RCO
3At normal temperatures by dilute phosphoric acid (20%P
2O
5) decompose enter solution and with solid phase Ca
5F (PO
4)
3Divide high.In this technology, do not consume other acid, but by first hydrogen ion (H in the phosphoric acid
+) carbonate in the ground phosphate rock is removed, the ground phosphate rock grade that enters extraction tank is greatly improved.In addition, when removing carbonate, because the molten P of a part of structure in the ground phosphate rock by phosphoric acid extraction
2O
5Enter solution, therefore CaO/P in pretreated thick slurry
2O
5Ratio less than Ca
5F (PO
4)
3Middle CaO/P
2O
5Ratio.Based on above-mentioned principle, processing method of the present invention comprises:
A, raw material ground phosphate rock is added decomposer, the phosphoric acid extraction input that again extractive reaction is obtained is carried out pre-treatment to it, to remove the free hydrochloric acid in carbonate and the phosphoric acid, its pretreatment reaction time was generally 30～120 minutes, divided after reaction is finished successively to add a certain amount of water with P in the solution again
2O
5Concentration maintain and be advisable in 5～9% scopes and the flocculation agent polyacrylamide, import the clarifying tank clarification then;
B, the supernatant liquid after will clarifying are stored as object input storagetank, and the thick slurry that ground phosphate rock is rich in lower floor is sent into extraction tank and added hydrochloric acid and extracts to produce phosphoric acid extraction, after reaction is finished slip is sent into the extraction clarifying tank and clarifies separation;
Supernatant liquid after c, the separation is sent into decomposer as the phosphoric acid extraction that contains the part free hydrochloric acid and is repeated a program, and raw material ground phosphate rock is carried out pre-treatment, and the bottom acid sludge is drained after sending separator to separate.
The prepared object phosphoric acid extraction of the present invention after both technology had been carried out the defluorinate processing routinely, adds calcium hydroxide or lime carbonate again to produce calcium hydrogen phosphate fodder; Can also be directly used in phosphoric acid salt such as producing ammonium phosphate, sodium phosphate with this phosphoric acid extraction as raw material.
The present invention is owing to adopt the phosphoric acid extraction that contains the part free hydrochloric acid that extractive reaction obtained in the flow process, at first raw material ground phosphate rock is carried out pre-treatment, both reduced the content of carbonate in the raw material, removed the free hydrochloric acid in the phosphoric acid again, thereby improved the grade that enters ground phosphate rock in the extraction tank, reduce the hydrochloric acid consumption and put 28～30%, improved economic benefit.
Accompanying drawing and description of drawings
Fig. 1 is a process flow diagram of the present invention.
Among the figure: 1, be decomposer, 2, pre-treatment slip clarifying tank, 3, extraction tank, 4, extraction slip clarifying tank, 5, storagetank, 6,7: shurry pump, A, contain the phosphoric acid extraction input direction of free hydrochloric acid, B, ground phosphate rock add Inbound, C, water and flocculation add Inbound, D, through pretreated slip input direction, E, object phosphoric acid extraction outbound course, F, through pretreated thick slurry inflow direction, G, hydrochloric acid adding place, slip input direction behind H, the extractive reaction, N, acid sludge outbound course, M, stirrer.
Embodiment
The phosphoric acid extraction clear liquid 11m that contains free hydrochloric acid by A from clarifying tank 4 to decomposer 1 input
3Add 2.15T ground phosphate rock simultaneously, stirring reaction is 1 hour at normal temperatures, to remove hydrochlorate in the raw material and the free hydrochloric acid in the phosphoric acid, adds clear water P to the solution from C then
2O
5Concentration maintain about 7%, add the polyacrylamide flocculant of 50,kg1 ‰ again after, slip is clarified separation by material pump 6 in D input clarifying tank 2; Supernatant liquid after the clarification is sent to storagetank 5 as object through E and stores, and the thick slurry of lower floor is sent into extraction tank 3 through F, and then is 1.12 from G adding proportion, and HCl content is 26% hydrochloric acid 3.9m
3Stirring reaction 1.5 hours is to obtain phosphoric acid extraction; After finishing, extractive reaction adds water to the about 11.2m of cumulative volume
3, through H it being moved into clarifying tank 4 by shurry pump 7 again and clarify separation, the clear liquid after the separation (clear liquid that promptly contains the part free hydrochloric acid) is emitted 11m through A
3Enter decomposer 1 repetition initial program the 2.15T ground phosphate rock that adds is once more carried out pre-treatment, lower floor's acid sludge is then transferred through N by the bottom and is drained after separator separates.
Enter CaO/P in the ground phosphate rock of extraction tank 3 in this embodiment
2O
5Ratio reduce to 1.28～1.32 by 1.45～1.70, thereby improved the grade of the ground phosphate rock that enters extraction tank 1, every input 2.15T raw material hydrochloric acid that ground phosphate rock consumes is reduced to 4.37T by the 6.12T of common process and is reduced hydrochloric acid consumption 28.6%.
Claims (1)
1, a kind of method with extracting phosphoric acid by hydrochloric acid method is characterized in that this method comprises:
A, raw material ground phosphate rock is added decomposer, the phosphoric acid extraction input that again extractive reaction is obtained is carried out pre-treatment to it, to remove the free hydrochloric acid in carbonate and the phosphoric acid, its pretreatment reaction time is 30～120 minutes, divides after reaction is finished successively to add a certain amount of water with P in the solution again
2O
5Concentration maintain in 5～9% scopes and the flocculation agent polyacrylamide, import the clarifying tank clarification then;
B, the supernatant liquid after will clarifying are stored as object input storagetank, and the thick slurry that ground phosphate rock is rich in lower floor is sent into extraction tank and added hydrochloric acid and carries out extractive reaction to produce phosphoric acid extraction, after reaction is finished slip is sent into the extraction clarifying tank and clarifies separation;
Supernatant liquid after c, the separation is sent into decomposer as the phosphoric acid extraction that contains the part free hydrochloric acid and is repeated a program, and raw material ground phosphate rock is carried out pre-treatment, and the bottom acid sludge is drained after sending separator to separate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94111777A CN1043213C (en) | 1994-06-01 | 1994-06-01 | Method for extracting phosphoric acid by hydrochloric acid method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94111777A CN1043213C (en) | 1994-06-01 | 1994-06-01 | Method for extracting phosphoric acid by hydrochloric acid method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1113879A CN1113879A (en) | 1995-12-27 |
| CN1043213C true CN1043213C (en) | 1999-05-05 |
Family
ID=5035612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94111777A Expired - Fee Related CN1043213C (en) | 1994-06-01 | 1994-06-01 | Method for extracting phosphoric acid by hydrochloric acid method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1043213C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052702C (en) * | 1996-09-27 | 2000-05-24 | 四川联合大学 | Optimized wet process for production of sulphuric acid |
| CN103754854A (en) * | 2013-12-17 | 2014-04-30 | 柳州东风化工股份有限公司 | Preparation method for feed and calcium hydrogen phosphate by using hydrochloric acid process |
| CN110548317A (en) * | 2019-09-20 | 2019-12-10 | 瓮福达州化工有限责任公司 | Flocculating agent and impurity sedimentation system suitable for wet-process phosphoric acid production |
-
1994
- 1994-06-01 CN CN94111777A patent/CN1043213C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1113879A (en) | 1995-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100519451C (en) | Method of resource protection, decrement treatment of town sewage and sludge | |
| CN102041389B (en) | Method for producing rare earth carbonate by recycling rare earth carbonate precipitation waste liquid | |
| CN103068735A (en) | Recovery of alumina trihydrate during the bayer process using cross-linked polysaccharides | |
| CN1299977C (en) | Method of fast eliminating solid matter and fluorine in wet method crude phoshporic acid | |
| CN108342597A (en) | A kind of method that the hydrochloric acid of Recycling Mother Solution decomposes scheelite | |
| CN101440430A (en) | Method for recycling rare earth from phosphogypsum leaching solution by fluoride precipitation method | |
| CN103613181A (en) | Method for treating phosphogypsum slag dump pool water by using low-grade lime | |
| CN1043213C (en) | Method for extracting phosphoric acid by hydrochloric acid method | |
| CN109694956B (en) | Method for separating iron, magnesium and aluminum elements from calcium-removed carbide slag | |
| CN100402418C (en) | Hydrochloric acid process of producing feed level calcium diphosphate and gypsum coproduct | |
| CN1730398A (en) | Method for producing powder form aluminum oxide by low concentration solution seed decomposition | |
| CN100411706C (en) | Method of dewatering concentrated bauxite | |
| CN1037596C (en) | Method for extracting phosphoric acid and solution containing phosphate by sulfuric acid method | |
| CN105073642A (en) | Cross-linked ethylsulfonated dihydroxypropyl cellulose | |
| CN101269841B (en) | Manganese oxide for dephenolization and method for processing high concentration phenol wastewater | |
| CN101830493A (en) | Method for processing waste salt slurry of calcined soda with sodium carbonate and sodium sulfate | |
| CN1150578A (en) | Process for recovering alkali by red mud waste liquid film method | |
| CN1789116A (en) | Method for producing phosphorous acid and gypsum using hydrochloric acid method | |
| CN1305946A (en) | Process for preparing feed-class calcium dihydrogen phosphate and high-phosphorus products | |
| CN1506474A (en) | Phosphorus-eliminating purification process of vanadium-containing chamotte leachate | |
| CN108675325B (en) | Method for separating manganese from magnesium chloride | |
| CN1789118A (en) | Method for producing feed calcium hydrogen phosphate using sulphuric acid method | |
| CN109485082A (en) | A kind of technique directly preparing 4N grades of strontium nitrates | |
| CN1280099A (en) | Technology for producing alumina via high alumina to silica ratio sintering process | |
| CN1789117A (en) | Method for producing potassium dihydrogen phosphate and gypsum using hydrochloric acid method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Gong Jiazhu Document name: payment instructions |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |