Method for producing feed-grade calcium dihydrogen phosphate from wet-process phosphoric acid
A technology of calcium dihydrogen phosphate and wet-process phosphoric acid, which is applied in animal feed, animal feed, chemical instruments and methods, etc., can solve the problems of increasing the production cost of calcium dihydrogen phosphate, fine product crystals, and low phosphorus yield, and achieves Small loss of phosphorus, reduction of harmful impurities, and good product fluidity
Active Publication Date: 2012-12-12
SINOCHEM YUNLONG
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Problems solved by technology
The amount of low-value-added fertilizer-grade calcium hydrogen phosphate produced in the production process accounts for 30wt% of the total finished product of calcium dihydrogen phosphate, the yield of phosphorus is low, the product has fine crystals, poor fluidity, and is easy to agglomerate
In order to ensure that the proportion of water-soluble phosphorus in the total phosphorus is greater than 90wt%, and the added thermal phosphoric acid accounts for more than 30wt% of the total phosphoric acid used, the high cost of thermal phosphoric acid directly increases the production cost of calcium dihydrogen phosphate
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[0028] Below in conjunction with specific examples of the present invention, further illustrate the specific implementation of the technical method of adopting wet-process phosphoric acid to produce feed grade calcium dihydrogen phosphate of the present invention. The advantages of the present invention will become clearer and easier to understand through the description of specific embodiments.
[0029] Grade P 2 o 5 Content≥24wt%, MgO≤5.0wt%, Fe 2 o 3 +Al 2 o 3 ≤3.5wt% natural phosphate rock, crushed and ground into a slurry, reverse flotation to remove some impurities to obtain phosphate concentrate. For example, in reverse flotation, add K salt and Na salt as collector at 580-630 g / t ore, preferably add K salt and Na salt at 600 g / t ore to obtain P 2 o 5 Content≥30wt%, MgO≤0.5wt%, Fe 2 o 3 +Al 2 o 3 ≤1.5wt% phosphorous concentrate. These K salts and Na salts are only flotation reagents. After flotation, the action of the reagents ends, and they have no effect o...
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A method for producing feed-grade calcium dihydrogen phosphate from wet-process phosphoric acid comprises the following steps of: pulping by the use of natural phosphate rock and carrying out reverse flotation to obtain phosphate concentrate, extracting for desulphurization by a dihydrate process so as to obtain dilute phosphoric acid, aging, setting and condensing to obtain concentrated phosphoric acid; filtering the concentrated phosphoric acid to remove impurities, extracting acid sludge, filtering acid, setting, removing impurities, carrying out secondary filtration to obtain purified phosphoric acid, and returning filter residue to the extraction step; and grinding limestone mine to obtain a calcium carbonate powder which can pass through a Tyler sieve of -100 meshes and is greater than 95 wt%, adding water to prepare a pulp, performing two stages of high-speed and low-speed reactions between the pulp and the purified phosphoric acid so as to generate a calcium dihydrogen phosphate slurry, and drying and slaking the slurry to obtain a powdered feed-grade calcium dihydrogen phosphate finished product. The method provided by the invention has advantages of high phosphorus yield, good impurity removal effect, low cost, coarse and large crystalllization product and good fluidity. The product is not easy to cake. The method replaces a technological method for producing feed-grade calcium dihydrogen phosphate from hot-process phosphoric acid. The method provided by the invention has advantages of saving energy, reducing emission, decreasing production cost and improving caking property of the calcium dihydrogen phosphate material and material fluidity.
Description
Technical field: [0001] The invention belongs to the field of new technology development and utilization of phosphate rock resources, and specifically relates to a method for producing feed-grade calcium dihydrogen phosphate, in particular to a method for producing feed-grade calcium dihydrogen phosphate through wet-process phosphoric acid. Background technique: [0002] Calcium dihydrogen phosphate is an excellent high-efficiency phosphate feed additive, mainly used as a feed additive for aquatic animals. Due to the high content of water-soluble phosphorus in calcium dihydrogen phosphate, which accounts for more than 90wt% of total phosphorus, it is beneficial for aquatic animals to absorb calcium. Phosphorus absorption, digestion and absorption rate is above 90%, less excretion, which is beneficial to environmental protection and other characteristics. It is widely used at home and abroad. [0003] Currently feed grade calcium dihydrogen phosphate (Ca(H 2 PO 4 ) 2 ·H ...
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IPC IPC(8): C01B25/32A23K1/175
Inventor 罗显明杨斌唐跃全周加勤马先林
Owner SINOCHEM YUNLONG
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