Method for producing feed-grade monocalcium phosphate by dry method

A calcium dihydrogen phosphate, feed-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of limited promotion, poor economic benefits, and high production costs, and achieve short technological processes, low production costs, and low production costs. Low environmental impact

Inactive Publication Date: 2014-09-03
SINOCHEM YUNLONG
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Problems solved by technology

[0008] The second method: use thermal phosphoric acid or directly react with calcium hydrogen phosphate products, because the thermal phosphoric acid used will also produce calcium hydrogen phosphate products, so the production cost is high, the economic benefit is poor, and the promotion is limited

Method used

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  • Method for producing feed-grade monocalcium phosphate by dry method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] React with 500Kg wet-process phosphoric acid and 197Kg calcium carbonate powder. The reaction equipment can be a vertical reactor with stirring, or a horizontal reactor or a tubular reactor. Wet-process phosphoric acid is calculated on the basis of 55wt% phosphorus pentoxide, the calcium carbonate content in calcium carbonate powder is 96wt%, and the water content is 0.1wt%. The semi-finished product of calcium dihydrogen phosphate is 611Kg, and the moisture content of the semi-finished product is between 7 and 18wt%. The semi-finished product- The 40-mesh material occupies more than 40%. After curing, it is dried by a drying furnace. The drying equipment can be a rotary cylinder dryer or a flash flow dryer. The inlet hot air temperature is 350°C, and the rotary dryer outlet temperature is 80°C. After drying A 534Kg product of calcium dihydrogen phosphate was obtained, and the moisture content of the dried product was controlled between 1 and 4wt%. Feed-grade calcium di...

Embodiment 2

[0032] Wet process purification of phosphoric acid and calcium carbonate powder according to the calcium / phosphorus ratio: 0.56 ~ 0.65, the ratio metered into the high-speed mixing reactor for reaction, control process indicators phosphorus pentoxide content in wet phosphoric acid 45 ~ 60wt%, acid temperature 50 ~ 80 ℃, the fineness of calcium carbonate powder -200 mesh is greater than 90wt%, the reaction temperature is 60-80 ℃, and the semi-finished product of calcium dihydrogen phosphate is produced, and the semi-finished product of calcium dihydrogen phosphate is dried by flash steam or rotary kiln to obtain the product of calcium dihydrogen phosphate.

[0033] Product index table:

[0034]

[0035] The quality of the feed grade calcium dihydrogen phosphate produced by the above method complies with the national standard GB / T22548-2008:

[0036] project Index Total phosphorus (P) content / % ≥ 22.0 Water-soluble phosphorus (P) content / % ≥ 20.0 ...

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Abstract

The invention relates to a production method of feed-grade monocalcium phosphate. The production method of feed-grade monocalcium phosphate comprises the following steps: firstly, purifying phosphoric acid by wet process with the concentration of 45-60wt% in percentage by mass of phosphorus pentoxide to the feed grade standard; secondly, grinding natural calcium carbonate mine into fine powder, wherein the content of CaCO3 in the natural calcium carbonate fine powder reaches 95wt% above; thirdly, carrying out matching and metering reaction on phosphoric acid and the natural calcium carbonate fine powder according to the range of Ca/P=0.56-0.65, and adding feed-grade monocalcium phosphate returning charge; fourthly, feeding the resultant in the step 3 into a curing storeroom, and curing for 72 hours above; drying the cured materials, and drying a finished product until the water content is 1-4wt%; and sixthly, crushing and screening the dried product to obtain the feed-grade monocalcium phosphate product conforming to the GB22549-2008 standard. According to the production method disclosed by the invention, other production technological defects are overcome, the feed-grade monocalcium phosphate product is synthesized by one step; the raw material grade requirement is low; the technological process is short; white fertilizers and waste water are not generated.

Description

technical field [0001] The invention relates to a production method of feed grade calcium dihydrogen phosphate. Background technique [0002] Feed-grade calcium dihydrogen phosphate is an excellent high-efficiency phosphate feed additive, which has high phosphorus content and high water solubility, and is a supplement for phosphorus and calcium for animals. It has the highest biological potency among feed-grade phosphates, and is especially suitable for fish and shrimp aquatic animals. The utilization rate of calcium dihydrogen phosphate phosphorus in fish and shrimp is as high as 94-98%, while calcium hydrogen phosphate (CaHPO 4 .2H 2 The utilization rate of phosphorus in O) is only 50%, so feed grade calcium dihydrogen phosphate plays an important role in the development of aquatic products. This variety of feed additive has been widely used at home and abroad. [0003] At present, there are two production methods for feed grade calcium dihydrogen phosphate products: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 马先林杨斌罗蜀峰王军李维明
Owner SINOCHEM YUNLONG
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