CN1064330C - Process for extracting sulfates from low grade powder of phosphorous ores - Google Patents
Process for extracting sulfates from low grade powder of phosphorous ores Download PDFInfo
- Publication number
- CN1064330C CN1064330C CN97121643A CN97121643A CN1064330C CN 1064330 C CN1064330 C CN 1064330C CN 97121643 A CN97121643 A CN 97121643A CN 97121643 A CN97121643 A CN 97121643A CN 1064330 C CN1064330 C CN 1064330C
- Authority
- CN
- China
- Prior art keywords
- grade
- phosphate
- leaching
- low
- calcium
- 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
Landscapes
- Coloring Foods And Improving Nutritive Qualities (AREA)
Abstract
The present invention discloses a technology for extracting and synthesizing phosphate from low-grade ground phosphorite. The present invention is characterized in that low-grade ground phosphorite is extracted with sulfuric acid, 2% SiO2 and 4% KCl are added for fluoride removal, and marble is calcined, digested and diluted into lime cream with the calcium content of 15%; the lime cream is added into phosphoric acid, the mixture is stirred and synthesized, and feed-grade calcium hydrogen phosphate is obtained by press filtration, drying and powdering; if stable synthesis is used, feed grade is firstly synthesized; and then, the calcium hydrogen phosphate of toothpaste grade, drug grade and food grade is synthesized.
Description
The invention relates to a method for directly synthesizing calcium hydrophosphate by deep processing and leaching low-grade phosphorite.
At present, the phosphorus and phosphate deficiency in north China is in short supply, especially the feed grade calcium hydrophosphate in recent years. The traditional process for producing calcium hydrogen phosphate is to synthesize calcium hydrogen phosphate by removing impurities from phosphoric acid. In the research of secondary defluorination for producing feed-grade calcium hydrophosphate, which is published in the fourth stage 1-4 of 1991 of inorganic salt industry, the process of the method is to leach phosphate fertilizer and synthesize calcium hydrophosphate by secondary impurity removal. The disadvantages are that: the phosphate fertilizer is firstly bought and synthesized by water immersion and secondary impurity removal, the process is complex and needs two manufacturers to complete the process. The cost is high.
The invention aims to provide a method for directly synthesizing calcium hydrophosphate by leaching low-grade powdered rock phosphate and removing impurities.
The technical solution of the invention comprises the following steps:
leaching: with P2O5Heating 20% of phosphate rock powder at a solid-liquid ratio of 1: 2, stirring at 80-100 ℃, adding industrial sulfuric acid for leaching, and dripping sulfuric acid until the pH value is equal to 2, wherein the main reaction formula is as follows:
and (3) fluorine removal: 2% SiO is added in the later stage of leaching2And 4% KCl to convert fluorine to potassium fluorosilicate, which has the formula:
preparing calcium: the marble is calcined, heated and hydrolyzed, passes through a cement bridge, a drum sieve, a hydrocyclone and a 200-mesh sieve, and is diluted to lime milk containing 15 percent of calcium.
Synthesizing: adding lime milk into 35-40 deg.C phosphoric acid, stirring, adding acid until pH is 6.8, aging for 30 min, press filtering, rapidly oven drying, pulverizing to obtain feed grade calcium hydrogen phosphate, and synthesizing by stages to obtain feed grade calcium hydrogen phosphate, wherein the filtrate contains part of phosphoric acid and calcium, and preparing into toothpaste, medicine and food grade calcium hydrogen phosphate.
And (4) leaching the low-grade phosphate rock powder twice or three times until the concentration of phosphoric acid reaches 20-40%.
The invention has the advantages that:
1. further develops low-grade phosphorite resources, changes the indigestion products into delicateness commodities, and drives raw materials such as marble, coal and the like to be commercialized at the same time.
2. The products are transported in a long distance, are three local commodities which are locally processed and digested from the raw materials in the north, and reduce the product cost.
3. The low-grade ground phosphate rock is leached and then simultaneously subjected to impurity removal, so that the calcium hydrophosphate is directly synthesized, the process is simple, the cost is low, and the effect is quick.
Claims (2)
1. The method for leaching phosphate from low-grade powdered rock phosphate is characterized by comprising the following steps: the method comprises the following steps:
leaching: with P2O5Heating 20% of phosphate rock powder at a solid-to-liquid ratio of 1: 2, stirring at 80-100 ℃, adding industrial sulfuric acid for leaching, and dripping sulfuric acid until the pH value is equal to 2;
and (3) fluorine removal: 2% SiO is added in the later stage of leaching2And 4% KCl to make fluorine become potassium fluosilicate, and precipitate in the filter residue;
preparing calcium: calcining marble, heating, hydrolyzing, sieving with a cement bridge, a drum sieve, a hydrocyclone, a 200-mesh sieve, and diluting to lime milk containing 15% of calcium;
synthesizing: adding lime milk into phosphoric acid at 35-40 deg.C, stirring, stopping adding acid until pH is 6.8, aging for 30 min, press filtering, rapidly oven drying, and pulverizing to obtain feed grade calcium hydrogen phosphate.
2. The method for leaching phosphate from low-grade powdered rock phosphate according to claim 1, characterized in that: and (4) leaching the low-grade phosphate rock powder twice or three times until the concentration of phosphoric acid reaches 20-40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97121643A CN1064330C (en) | 1997-11-20 | 1997-11-20 | Process for extracting sulfates from low grade powder of phosphorous ores |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97121643A CN1064330C (en) | 1997-11-20 | 1997-11-20 | Process for extracting sulfates from low grade powder of phosphorous ores |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1218003A CN1218003A (en) | 1999-06-02 |
| CN1064330C true CN1064330C (en) | 2001-04-11 |
Family
ID=5176344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97121643A Expired - Fee Related CN1064330C (en) | 1997-11-20 | 1997-11-20 | Process for extracting sulfates from low grade powder of phosphorous ores |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1064330C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101302129B (en) * | 2008-05-22 | 2011-11-30 | 东莞市施普旺生物科技有限公司 | Calcium hydrophosphate suspending agent |
| CN103723698B (en) * | 2013-11-25 | 2015-07-15 | 瓮福（集团）有限责任公司 | Method for reducing content of magnesium in feed grade calcium hydrophosphate |
| CN106882778A (en) * | 2015-12-15 | 2017-06-23 | 中国科学院大连化学物理研究所 | A kind of method that toothpaste grade calcium hydrophosphate is prepared in micro passage reaction |
| CN114106837B (en) * | 2021-11-25 | 2023-11-21 | 中化农业（临沂）研发中心有限公司 | Saline-alkali soil conditioner containing polyphosphate and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485078A (en) * | 1982-03-16 | 1984-11-27 | Agrico Chemical Company | Process for producing wet process phosphoric acid from phosphate rocks containing fluochlorapatite and related minerals |
| CN1048015A (en) * | 1990-02-17 | 1990-12-26 | 云南易门矿务局 | Low ratio acid wet method is produced calcium hydrophosphate fodder |
| CN1113880A (en) * | 1994-06-01 | 1995-12-27 | 龚家竹 | Method for extracting phosphoric acid and solution containing phosphate by sulfuric acid method |
-
1997
- 1997-11-20 CN CN97121643A patent/CN1064330C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485078A (en) * | 1982-03-16 | 1984-11-27 | Agrico Chemical Company | Process for producing wet process phosphoric acid from phosphate rocks containing fluochlorapatite and related minerals |
| CN1048015A (en) * | 1990-02-17 | 1990-12-26 | 云南易门矿务局 | Low ratio acid wet method is produced calcium hydrophosphate fodder |
| CN1113880A (en) * | 1994-06-01 | 1995-12-27 | 龚家竹 | Method for extracting phosphoric acid and solution containing phosphate by sulfuric acid method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1218003A (en) | 1999-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105600763B (en) | A kind of method that fluoride salt method of purification produces industrial monoammonium phosphate | |
| CN102001636A (en) | Method for producing broad-concentration phosphoric acid and clean plaster by middle-low grade phosphorus ore wet process | |
| CN112279540B (en) | Method for producing alpha-hemihydrate gypsum by using phosphogypsum | |
| CN1297847A (en) | Comprehensive utilization method of waste ammonia sode liquid and sodium sulfate containing waste liquid | |
| CN1062844C (en) | Process for producing potassium sulfate and its by-product using potassium ore | |
| CN1064330C (en) | Process for extracting sulfates from low grade powder of phosphorous ores | |
| CN105133003A (en) | Production method for wet-process phosphoric acid byproduct alpha semi-hydrated gypsum whiskers | |
| CN105480959A (en) | Method for producing monopotassium phosphate by fluoride salt purification process | |
| CN115676788B (en) | High-purity potassium dihydrogen phosphate and preparation method thereof | |
| CN101182036A (en) | Technique for preparing high-purity vanadium pentoxide by high-vanadium edulcoration | |
| AU574321B2 (en) | Phosphoanhydrite process | |
| CN1305946A (en) | Process for preparing feed-class calcium dihydrogen phosphate and high-phosphorus products | |
| CN105002521A (en) | Method for removing magnesium impurities in electrolytic manganese system through fluorine-bearing minerals | |
| CN109319896A (en) | The method for preparing flocculant with flyash and vanadium titano-magnetite | |
| US2889217A (en) | Process for producing defluorinated phosphate material | |
| CN103539487B (en) | Produce the method for phosphorus ammonium | |
| CN106800284B (en) | A kind of method of phosphorus ore de-magging phosphoric acid byproduct monoammonium | |
| CN115259121B (en) | Preparation method of germanium pyrophosphate | |
| CN110963475B (en) | Method for producing phosphate concentrate powder | |
| US4005175A (en) | Process for the joint production of sodium tripolyphosphate and titanium dioxide | |
| CN101412514A (en) | Technique for preparing white carbon black by phosphoric acid precipitation and directly coproducing sodium phosphate | |
| CN1059880C (en) | Treatment of flyash | |
| CN114275802B (en) | Method for large-scale absorption and high-value utilization of phosphate rock tailings | |
| CN1318512A (en) | Method for preparing white carbon uisng kaolin decomposing process | |
| CN1128103C (en) | Process for preparing potassium sulfate |
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 | ||
| 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 |