Production method for feed grade particulate calcium dihydrogen phosphate

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...

AI Technical Summary

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.

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