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A kind of production method of feed grade tricalcium phosphate
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A technology of tricalcium phosphate and production method, which is applied in the production field of feed-grade tricalcium phosphate, can solve the problems of long sintering time, high production cost, poor economic benefit, etc., and achieves reduction of product quality fluctuation, production cost reduction, and production improvement. The effect of efficiency
Active Publication Date: 2019-12-31
SHANGHAI CAIFENG FEED PHOSPHORUS & CALCIUM
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[0005] The tricalcium phosphate produced by the above-mentioned double superphosphate method has insufficient purity, high fluorine content, long sintering time, high energy consumption, high production cost, poor economic benefit and is not conducive to environmental protection
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Embodiment 1
[0044] Embodiment 1: as figure 1 Shown, a kind of production method of feed grade tricalcium phosphate, each component and corresponding weight parts thereof are as shown in table 1, and prepare and obtain by following steps:
[0045] (1) After pulverizing phosphate rock powder, calcium carbonate and sodium bicarbonate, mix and stir evenly, adopt hot air drying to remove moisture;
[0046] (2) After adding the mass percent concentration of the material stirred uniformly in the step (1) to 50% phosphoric acid, mix well, put into a pelletizing machine to form pellets, and the diameter of the pellets is 15mm;
[0047] (3) Put the pellets into a rotary kiln for calcination, the calcination temperature is 1200°C, the calcination time is 80min, and the steam above 100°C is introduced to promote defluorination during calcination;
[0048] (4) The calcined tail gas of the rotary kiln is recovered part of the heat through the waste heat boiler, and after cooling down to 300°C, it is d...
Embodiment 2-5
[0051] Embodiment 2-5: a production method of feed-grade tricalcium phosphate, the difference from embodiment 1 is that each component and its corresponding parts by weight are shown in Table 1.
[0052] Each component and parts by weight thereof in table 1 embodiment 1-5
[0053]
Embodiment 6
[0054] Embodiment 6: a kind of production method of feed grade tricalcium phosphate, and the difference with embodiment 3 is, the pore diameter of activated alumina is loaded with metal accelerator, and metal accelerator is titanium, and loading method is roasting method , the roasting method includes the following steps: 1. adding nano-titanium dioxide to deionized water to form a suspension; 2. adding activated alumina to the suspension and stirring, the weight ratio of nano-titanium dioxide to activated alumina is 1:100, suction filtration, Drying; 3. Put the dried activated alumina into a muffle furnace for roasting at a temperature of 800° C. After roasting, cool down to room temperature to obtain activated alumina loaded with titanium.
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Abstract
The invention discloses a method for producing feed-grade tricalcium phosphate and relates to the technical field of feed additive processing. The method comprises the following steps: crushing ground phosphate rock, calcium carbonate and sodium bicarbonate, uniformly mixing, and drying; putting phosphoric acid into the uniformly stirred materials, and pelletizing in a pelletizer so as to obtain spheres; calcining the spheres in a rotary kiln, and at the same time introducing steam for promoting defluorination; cooling a recycled calcined tail gas, performing defluorination treatment by using an adsorbent, and further feeding into the rotary kiln for circulation; cooling the calcined material, crushing, and performing ball milling in a ball mill; screening the milled material, and adsorbing by using an electromagnet to remove metallic iron impurities, thereby obtaining the feed-grade tricalcium phosphate. As the steam is subjected to defluorination treatment by using the adsorbent and is circulated, the energy consumption and the production cost are reduced, and the production efficiency is improved; as metals are loaded in micro-pores of the activated aluminum oxide, the chemical adsorption of an HF gas is improved, and particularly the method has the advantages of being high in purity, low in fluorine content and low in energy consumption.
Description
technical field [0001] The invention relates to the technical field of feed additive processing, more specifically, it relates to a production method of feed grade tricalcium phosphate. Background technique [0002] Feed phosphate is an important mineral feed additive, and the consumption of feed phosphate is one of the symbols to measure the development level of a country's agriculture and animal husbandry. There are more than 20 varieties of feed phosphate abroad, including calcium salt, sodium salt, ammonium salt, potassium salt, etc., of which calcium phosphate accounts for more than 90% of its consumption. [0003] Defluorotricalcium phosphate [Ca3(PO4)2] is a white, light gray or brown amorphous powder, odorless and tasteless, with excellent physical and chemical properties, almost insoluble in water, soluble in 0.4% hydrochloric acid (equivalent Stomach acid in poultry) or 2% citric acid (equivalent to the acidity of plant roots). Calcium defluorinated phosphate has...
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