Production process of efficient feed-grade monocalcium phosphate by using boiler waste residue for purification of phosphoric acid by wet process

A technology of calcium dihydrogen phosphate and wet-process phosphoric acid, which is applied in the field of phosphorus chemical industry, can solve the problems of low utilization rate of phosphorus resources, high production cost, negative product quality, etc., so as to be beneficial to filtration and separation, reduce direct emissions, and reduce production. cost effect
CN106115643AActive Publication Date: 2016-11-16SINOCHEM YUNLONG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SINOCHEM YUNLONG
Publication Date
2016-11-16

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Abstract

The invention discloses a production process of efficient feed-grade monocalcium phosphate by using boiler waste residue for purification of phosphoric acid by wet process. The invention includes the following contents: crushing waste residue from boiler desulfurization, mixing the waste residue with phosphoric acid obtained by concentration of phosphoric acid by wet process for desulfurization reaction, after the reaction, subjecting the phosphoric acid to defluorination treatment, filtering to remove a fluoric phosphoric acid slurry to obtain a finished product of phosphoric acid; mixing and reacting the finished product of phosphoric acid with calcium mineral slurry; and granulating and drying in a spray drying tower, and then conducting rotary vacuum drying to obtain the product. The invention realizes the recycling of boiler desulfurization waste residue, efficiently utilizes active CaO and SiO2 in the waste residue, reduces waste residue treatment costs, reduces consumption for production if a defluorination additive. The obtained feed-grade monocalcium phosphate product has mellow appearance, low internal moisture in the particles, high product purity and no agglomeration, improves the market competitiveness, and achieves cost reduction and efficiency improvement for enterprises.
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Description

technical field

[0001] The invention belongs to the technical field of phosphorus chemical industry, in particular to a process for producing high-efficiency feed-grade calcium dihydrogen phosphate by using boiler waste residue to purify wet-process phosphoric acid. Background technique

[0002] Phosphorus is an important element of life, and phosphate additives are widely used as food and feed additives. Due to the high cost of thermal phosphoric acid, almost all feed-grade calcium phosphate products on the market currently use wet-process phosphoric acid as raw material for production. However, due to the limitation of wet-process phosphoric acid process, there are many impurities in the product, which affects product quality.

[0003] With the continuous progress of the industry, the requirements for calcium feeding products will also continue to increase. According to the latest revision of the national standard for feed grade calcium dihydrogen phosphate (GB 22548-2008)...

Claims

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