CN1590286A - New production technology of feed grade calcium hydrogen phosphate - Google Patents
New production technology of feed grade calcium hydrogen phosphate Download PDFInfo
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- CN1590286A CN1590286A CN 200410026832 CN200410026832A CN1590286A CN 1590286 A CN1590286 A CN 1590286A CN 200410026832 CN200410026832 CN 200410026832 CN 200410026832 A CN200410026832 A CN 200410026832A CN 1590286 A CN1590286 A CN 1590286A
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- calcium hydrophosphate
- hydrophosphate fodder
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Abstract
A process for preparing the feed-class calcium hydrogen phosphate includes reaction between calcium carbonate slurry and wet phosphoric acid in high-speed spiral reactor, solidifying reaction by chemically synthetic belt, breaking, drying, and pulverizing. It has high P recovering rate 98%.
Description
Technical field
The invention belongs to a kind of new process of production of calcium hydrophosphate fodder.
Background technology
Secondary calcium phosphate is a kind of important mineral feed.The production technique of existing calcium hydrophosphate fodder often claims wet processing, is with sulfuric acid or decomposing phosphate rock by chlorhydric acid powder, after making dilute phosphoric acid, to pH value about 3.8, temperature of reaction is 45 ℃ with the milk of lime neutralising phosphoric acid, generation secondary calcium phosphate precipitation, more after filtration, drying, the product feed-grade phosphate.The wet processing that Here it is often says.This technical process is long, and equipment is many, and investment is big.Production process has large amount of sewage to discharge, and causes environmental pollution.A large amount of filter residue dischargings is arranged in the defluorination process, cause a large amount of losses of phosphorus, the rate of recovery Gongwei about 70% of phosphorus.Production automation degree is low, the technology controlling and process difficulty, and unstable product quality, production cost is higher.
Summary of the invention
The new process of production that the purpose of this invention is to provide a kind of calcium hydrophosphate fodder, direct by the lime carbonate slip and purified phosphoric acid by wet process, in the high-speed screw reactor, fully carry out first order reaction under the normal temperature, reaction mass further carries out the secondary curing reaction through the chemosynthesis belt, material is solidified, enter revolving drier through beater again and carry out drying, dried material moisture is less than 2%, gets the mash feed calcium hydrophosphate through crusher in crushing again.
Technical solution of the present invention is:
The new process of production of calcium hydrophosphate fodder comprises routine step down:
(1) preparation of lime carbonate slip
With purity is 98% calcium carbonate stone powder, crushing grinding, and fineness surpasses 200 mesh sieves greater than 85%, adds the slurry that water is mixed with solid content 68%～72% under the normal temperature;
(2) phosphoric acid by wet process that purifies through defluorinate contains P
2O
5% 〉=38, P/F 〉=110 and lime carbonate slip measure through magnetic flow meter, are added simultaneously in proportion by computer controlled automatic and carry out the one-level contact reacts in the high-speed screw reactor, and the reaction times is 2～5 minutes, and temperature of reaction is a normal temperature;
(3) reacted streams is carried out the secondary curing reaction to the chemosynthesis belt material is solidified, reaction times is 40～60 minutes, material after the curing enters revolving drier through beater and carries out drying, the moisture eliminator inlet temperature is 400～450 ℃, temperature out is 68～70 ℃, dry used roasting kiln fire box temperature is 800～900 ℃, and fuel is semi-water gas;
(4) moisture of dried material reaches at 2% o'clock, after the sieve apparatus screening, is the calcium hydrophosphate fodder product, and macrobead is together incorporated product into through crusher in crushing again.
The present invention compares with existing technology, and flow process is short, and the phosphorous recovery height can reach 98%, without sewage discharge, and production technique is controlled easily, can carry out automatization control.Facility investment is few, and production cost is low.
Description of drawings
Fig. 1 is a technological process block-diagram of the present invention.
Embodiment
The present invention adopts direct and phosphoric acid by wet process abundant contact reacts in the high-speed screw reactor by the lime carbonate slip, stirs and mass transport by high-speed screw, has solved foam generation problem.On the chemosynthesis belt, carry out curing reaction again, generate secondary calcium phosphate with the complete reaction that reaches phosphoric acid and lime carbonate.This technology has solved with discharging of milk of lime large amount of sewage that neutralization-precipitation reaction produces and the low problem of phosphorous recovery, and the rate of recovery of phosphorus can reach 98% in the whole process of production, greatly reduces production cost.Level of automation height in production operation, reaction process can carry out computer controlled automatic, and technology controlling and process is simple, has solved the problem of wet processing operational difficulty.In the wet production process, technology controlling and process has many-side, as feed rate, temperature of reaction, pH value, stirring velocity etc., if therefore any one processing condition control is bad, can cause calcium hydrophosphate crystal tiny, can't filter, production can't be carried out, and causes unstable product quality simultaneously.Production technique of the present invention is not subjected to the restriction of above-mentioned processing condition fully, only controls the flowrate proportioning of lime carbonate slip and phosphoric acid, and production operation is very simple, constant product quality.The common wet processing roasting kiln of dehumidification system is fuel used to be diesel oil or heavy oil or Sweet natural gas.The big drying cost that reduced of this process using semi-water gas.Compare about 80 yuan of drying cost reductions per ton with burning diesel oil.Novel process Production Flow Chart of the present invention is short, and equipment is few, and plant investment can be saved about 40%.For example implement, add 300 kg of water in the slurry vessel of belt stirrer, get 700 kilograms, cross the calcium carbonate stone powder of 250 orders, purity 98%, add lime carbonate while stirring, be the calcium carbonate slurry of solid content 70% after finishing with pilot plant; Phosphoric acid after the purification, concentration are P
2O
5%=40.05, P/F 〉=123, ρ=1.463; Lime carbonate slip and phosphoric acid measure with magnetic flow meter; The lime carbonate slip is with per hour 106.65 kilograms, phosphoric acid adds in the reactor with 145.0 kilograms flow per hour simultaneously, the time that reactor stops reaction is 2 minutes, and reacted pulp flow is cured reaction to the chemosynthesis belt, and the reaction times is 45 minutes; Material after the curing enters revolving drier through beater and carries out drying, and the moisture eliminator inlet temperature is 418 ℃, and temperature out is 71 ℃, and the roasting kiln fire box temperature is controlled at 800～900 ℃, and fuel is semi-water gas, and dried material moisture is less than 2%.Dust reclaims and adopts the two-stage dedusting, and the first step is cyclone dust removal, and the second stage is bag-type dusting, and the recyclable phosphorus of dust reaches 98%.Measure this product by analysis and conform to the GB2626-94 quality standard.Product analysis result such as following table:
Ca% P% F% AS% heavy metal meter H
2O%
21.07 18.26 0.13 ＜0.004 ＜0.003 1.98
Claims (3)
1, a kind of new process of production of calcium hydrophosphate fodder is characterized in that comprising routine step down:
(1) preparation of lime carbonate slip is 98% calcium carbonate stone powder with purity, crushing grinding, and fineness surpasses 200 mesh sieves greater than 85%, adds the slurry that water is mixed with solid content 68%～72% under the normal temperature;
(2) phosphoric acid by wet process that purifies through defluorinate contains P
2O
5% 〉=38, P/F 〉=110 and lime carbonate slip through the magnetic flow meter metering, by computer controlled automatic, add simultaneously in proportion and carry out the one-level contact reacts in the high-speed screw reactor, and the reaction times is 2～5 minutes, and temperature of reaction is a normal temperature;
(3) reacted streams is carried out the secondary curing reaction to the chemosynthesis belt, material is solidified, reaction times is 40～60 minutes, material after the curing, enter revolving drier through beater and carry out drying, the moisture eliminator inlet temperature is 400～450 ℃, and temperature out is 68～70 ℃, dry used roasting kiln fire box temperature is 800～900 ℃, and fuel is semi-water gas;
(4) moisture of dried material reaches at 2% o'clock, after the sieve apparatus screening, is the calcium hydrophosphate fodder product, and macrobead is together incorporated product into through crusher in crushing again.
2, according to the new process of production of the described calcium hydrophosphate fodder of claim 1, it is characterized in that dust reclaims the dedusting of employing two-stage, the first step is cyclone dust removal, and the second stage is bag-type dusting, and the recyclable phosphorus of dust reaches 98%.
3,, it is characterized in that dry used roasting kiln fuel is water-gas according to the new process of production of the described calcium hydrophosphate fodder of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410026832 CN1590286A (en) | 2004-04-13 | 2004-04-13 | New production technology of feed grade calcium hydrogen phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410026832 CN1590286A (en) | 2004-04-13 | 2004-04-13 | New production technology of feed grade calcium hydrogen phosphate |
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| CN1590286A true CN1590286A (en) | 2005-03-09 |
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| CN 200410026832 Pending CN1590286A (en) | 2004-04-13 | 2004-04-13 | New production technology of feed grade calcium hydrogen phosphate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100595136C (en) * | 2008-04-11 | 2010-03-24 | 四川川恒化工股份有限公司 | Method for producing feed-grade calcium phosphate |
| CN106006594A (en) * | 2016-05-24 | 2016-10-12 | 湖州展望药业有限公司 | Production method of medicinal anhydrous calcium hydrogen phosphate |
| CN117923447A (en) * | 2024-03-20 | 2024-04-26 | 云南磷化集团有限公司 | Method and device for continuously producing calcium hydrophosphate by cascade reaction kettles |
| CN117923447B (en) * | 2024-03-20 | 2024-06-04 | 云南磷化集团有限公司 | Method and device for continuously producing calcium hydrophosphate by cascade reaction kettles |
-
2004
- 2004-04-13 CN CN 200410026832 patent/CN1590286A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100595136C (en) * | 2008-04-11 | 2010-03-24 | 四川川恒化工股份有限公司 | Method for producing feed-grade calcium phosphate |
| CN106006594A (en) * | 2016-05-24 | 2016-10-12 | 湖州展望药业有限公司 | Production method of medicinal anhydrous calcium hydrogen phosphate |
| CN106006594B (en) * | 2016-05-24 | 2018-06-26 | 湖州展望药业有限公司 | A kind of production method of medicinal calcium phosphate dibasic anhydrous |
| CN117923447A (en) * | 2024-03-20 | 2024-04-26 | 云南磷化集团有限公司 | Method and device for continuously producing calcium hydrophosphate by cascade reaction kettles |
| CN117923447B (en) * | 2024-03-20 | 2024-06-04 | 云南磷化集团有限公司 | Method and device for continuously producing calcium hydrophosphate by cascade reaction kettles |
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