Production method for feed grade particulate calcium dihydrogen phosphate

A technology of calcium dihydrogen phosphate and its production method, which is applied in the fields of chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., and can solve the problems of impossibility of increasing device capacity, impossibility of long-term production, high production cost, etc., and meet the requirements of raw material grade Low cost, low production cost, and low environmental impact

Inactive Publication Date: 2016-01-06
SINOCHEM YUNLONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 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
The production process is long. Due to the high viscosity of the material, all the equipment in contact with the material cannot be produced for a long period of time, and the device capacity cannot be enlarged.

Method used

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  • Production method for feed grade particulate calcium dihydrogen phosphate
  • Production method for feed grade particulate calcium dihydrogen phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1000Kg of wet-process phosphoric acid is reacted with 297.5Kg of calcium carbonate powder. Wet-process phosphoric acid is dilute phosphoric acid obtained from phosphate rock through sulfuric acid extraction reaction and filtration. Dilute phosphoric acid is then concentrated by indirect heating with steam. Concentrated phosphoric acid is defluorinated, dearsenic, and heavy metal removed. Obtained purified phosphoric acid. The reaction temperature is 65°C, and the reaction equipment can be a stirred vertical reactor, a horizontal reactor or a tubular reactor. Wet process phosphoric acid is calculated on the basis of phosphorus pentoxide 43wt%, the calcium carbonate content in the calcium carbonate powder is 98wt%, the water content is 0.1wt%, and the semi-finished product of calcium dihydrogen phosphate is 4636Kg, and the water content of the semi-finished product is about 18wt%. The standard feed-grade calcium dihydrogen phosphate product is 2503Kg and then dried after ...

Embodiment 2

[0037] React 100,000Kg of wet-process phosphoric acid with 33,213Kg of calcium carbonate powder at a reaction temperature of 65°C. 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 phosphorus pentoxide 45wt%, calcium carbonate content in calcium carbonate powder is 98wt%, water content 0.1wt%, and 109658Kg of semi-finished calcium dihydrogen phosphate is produced, with a water content of 20wt%. The feed grade calcium dihydrogen phosphate product is 269374Kg and then dried after being returned. The drying equipment can be a rotary cylinder dryer or a flash steam dryer. The inlet hot air temperature is 300-600°C, and the outlet temperature of the rotary dryer is 80-110°C After drying, 89,791 kg of calcium dihydrogen phosphate is obtained, and the moisture content of the dried product is controlled between 1 and 4 wt%.

[0038] The particle size of the semi-finish...

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Abstract

The present invention relates to a production method for feed grade particulate calcium dihydrogen phosphate The method comprises the following steps of: step 1. purifying wet process phosphoric acid with a mass concentration of phosphorus pentoxide at 40-45 wt% to a feed-grade level standard; step 2. grinding natural calcium carbonate ore to fine powder, wherein the fine powder with the fineness which is 100 meshes is greater than 90%; and a concentration of CaCO3 in natural calcium carbonate fine powder is greater than 95 wt%; step 3. in accordance with a Ca / P ratio in the range of 0.56-0.65, performing a proportion measurement reaction, producing a semifinished product of calcium dihydrogen phosphate, adding feed grade particulate calcium dihydrogen phosphate revert into the semifinished product, wherein an index thereof accrods with a GB22549-2008 standard; step 4. drying, wherein during drying, hot air inlet temperature is 300-600 DEG C, drying device outlet temperature is 80-110 DEG C, and moisture content of a finished product after drying is 1-4 wt%; and step 5. performing granulation and sieving on the finished product obtained in the step 4, sending a finished product of particulate calcium dihydrogen phosphate at 20-80 mesh to a packaging process and perform packaging to obtain a final product, wherein a material larger than 20 meshes is ground and used as a revert together with the finished product that is smaller than 80 meshes.

Description

technical field [0001] The invention relates to a production method of feed grade calcium dihydrogen phosphate, especially a production method of granular calcium dihydrogen phosphate. Background technique [0002] Feed grade granular calcium dihydrogen phosphate is an excellent high-efficiency phosphate feed additive with high phosphorus content and high water solubility. It 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 O) the utilization rate of phosphorus in the middle is only 50%, thus feed grade granular calcium dihydrogen phosphate plays an important role in the development of aquatic products, and this kind of feed additive has been widely used at home and abroad. [0003] At p...

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
Owner SINOCHEM YUNLONG
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