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Method for preparing feed-grade calcium hydrophosphate by wet-process phosphoric acid organic extraction and purification raffinate

A technology of calcium hydrogen phosphate and wet-process phosphoric acid, which is applied in the field of phosphorus chemical industry, can solve the problems of high energy consumption and cost increase, and achieve the effect of low energy consumption and friendly reaction environment

Active Publication Date: 2012-12-05
KUNMING CHUAN JINNUO CHEM IND
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Problems solved by technology

Raffinic acid contains 20~25% P 2 o 5 , it is mostly used to prepare fertilizer-grade monoammonium phosphate, but it needs to be concentrated when using raffinate, which consumes a lot of heat energy during production, resulting in an increase in the cost of the product

Method used

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  • Method for preparing feed-grade calcium hydrophosphate by wet-process phosphoric acid organic extraction and purification raffinate

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Embodiment 1

[0025] Will contain 20~25% P 2 o 5 The raffinate with 0.3% F ion is sent to a first-stage neutralization reaction tank, and calcium carbonate slurry with a weight ratio of 15% is introduced until the pH value is 1.8~2.0, and then at 50°C, continue to stir for neutralization React for 1 hour; the slurry is settled by a thickener, and after settling for 1 hour, the solid part of the thick slurry is sent to the drying system for drying treatment to obtain fertilizer grade calcium hydrogen phosphate; the clear liquid is sent to into the second-stage neutralization reaction tank, and then pass through milk of lime with a weight ratio of 3% for neutralization reaction until the pH value is 2.2~2.5; The slurry part is returned to the first-stage neutralization reaction tank, and the clear liquid is sent to the third-stage neutralization reaction tank; the milk of lime with a weight ratio of 8% is passed into the third-stage neutralization reaction tank to carry out neutralization re...

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Abstract

The invention discloses a method for preparing feed-grade calcium hydrophosphate by wet-process phosphoric acid organic extraction and purification raffinate. Raffinate acid used for organic solvent extraction and purification in a wet-process phosphoric acid preparing process is used as the raw material of the feed-grade calcium hydrophosphate, wherein the raffinate acid contains 20-25% of P2O5 and 0.3% of F ions; the feed-grade calcium hydrophosphate is prepared by the three-stage neutralization reaction technology, wherein the first-stage neutralization reaction is neutralization reaction with calcium carbonate, and the second-stage neutralization reaction and the third-stage neutralization reaction are neutralization reaction with lime milk; the raffinate acid can be comprehensively utilized by segmentation and multi-grade neutralization reaction; and the byproduct fertilizer-grade calcium hydrophosphate of the feed-grade calcium hydrophosphate is produced. Compared with the prior art, the method disclosed by the invention is characterized in that condensation is omitted when the raffinate acid is used, energy consumption is low, the raffinate acid is fully reused, the whole technical process is free from high-temperature heating, the reaction is environmentally friendly, and the technical process conforms to the environment-friendly requirement of energy saving and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of phosphorus chemical industry, and in particular relates to a method for preparing feed-grade calcium hydrogen phosphate from raffinate produced during the extraction and purification of industrial phosphoric acid with a wet-process phosphoric acid organic solvent. Background technique [0002] The production of fine phosphorus chemical industry has very high requirements on the quality of phosphoric acid. In the past, phosphoric acid prepared by thermal method was generally used. Due to the high cost of this method, the price of thermal phosphoric acid is high, and there is no cost advantage. At present, the development trend of industrial phosphoric acid is to use industrial-grade phosphoric acid prepared by wet-process phosphoric acid, that is, to replace thermal-process phosphoric acid with industrial-grade phosphoric acid prepared by organic solvent extraction and impurity removal. When wet-process ph...

Claims

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Application Information

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IPC IPC(8): C01B25/32
Inventor 周永祥周桂民曾润国刘甍魏家贵
Owner KUNMING CHUAN JINNUO CHEM IND
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