Method for preparing feed grade calcium hydrophosphate by phosphorite decomposition by hydrochloric acid

A calcium hydrogen phosphate, feed-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of unstable product quality of calcium hydrogen phosphate, unfavorable environmental protection of phosphogypsum, high production cost, etc., to alleviate sulfur resources The effect of tension, low cost and short production process

Inactive Publication Date: 2014-12-17
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing feed grade calcium hydrogen phosphate by decomposing phosphate rock with hydrochloric acid, so as to solve the problems of high production cost, high energy consumption, long process and unfavorable stacking of phosphogypsum in the existing sulfuric acid method and nitric acid method for producing phosphoric acid. Environmental protection, there are many impurities in phosphoric acid, and the quality of calcium hydrogen phosphate is unstable

Method used

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  • Method for preparing feed grade calcium hydrophosphate by phosphorite decomposition by hydrochloric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Will P 2 o 5 The phosphate rock with a content of 17% was crushed to 200 mesh, and 1300g of hydrochloric acid with a mass concentration of 20% was added, and reacted for 50 minutes; the temperature was raised to 55°C, and Na 2 S 0.5g, H 2 o 2 0.2g, reacted for 30min, filtered; added 250g of melamine to the filtrate, reacted for 30min, passed through 280g of ammonia water with a mass concentration of 20%, reacted for 40min, filtered; the filtrate was adjusted to pH 6.5 with calcium hydroxide solution, stirred for 20min, filtered and baked Dried calcium hydrogen phosphate 123g, through analysis quality reaches feed grade calcium hydrogen phosphate first-class product requirement.

Embodiment 2

[0041] Will P 2 o 5 The phosphate rock with a content of 17% was crushed to 100 mesh, and 1200g of hydrochloric acid with a mass concentration of 25% was added to react for 40 minutes; the temperature was raised to 60°C, and Na 2 S 0.7g, H 2 o 2 0.4g, reacted for 35min, filtered; added 280g of melamine to the filtrate, reacted for 45min, passed through 260g of ammonia water with a mass concentration of 25%, reacted for 40min, filtered; the filtrate was adjusted to pH 7 with calcium hydroxide solution, stirred for 35min, filtered and baked Dried calcium hydrogen phosphate 135g, through analysis quality reaches feed grade calcium hydrogen phosphate first-class product requirement.

Embodiment 3

[0043] Will P 2 o 5 The phosphate rock with a content of 17% was crushed to 80 mesh, and 1200g of hydrochloric acid with a mass concentration of 25% was added, and reacted for 40 minutes; the temperature was raised to 60°C, and Na 2 S 0.7g, activated carbon 0.4g, react for 35min, filter; add 280g of melamine to the filtrate, react for 45min, pass through 260g of ammonia water with a mass concentration of 25%, react for 40min, filter; adjust the pH value of the filtrate to 7 with calcium hydroxide solution, stir for 35min , filtered and dried to obtain 135g of dibasic calcium phosphate, which reached the requirements of first-class feed grade dibasic calcium phosphate through analysis.

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Abstract

The invention discloses a method for preparing feed grade calcium hydrophosphate by phosphorite decomposition by hydrochloric acid. The method mainly comprises the following steps: (1) reacting powdered rock phosphate with hydrochloric acid to produce a mixed solution of phosphoric acid and calcium chloride; (2) heating, adding Na2S to remove metal impurities, and adding H2O2 for decolorization; (3) adding melamine to produce melamine phosphate; (4) adding ammonia for reaction to obtain an ammonium phosphate solution and melamine; and (5) adding a Ca(OH)2 saturated solution into the ammonium phosphate solution for reaction to obtain calcium hydrogen phosphate. The invention has advantages of simple process, low cost, short production flow and low energy consumption; a byproduct calcium chloride solves the environmental problem caused by phosphogypsum stacking; a calcium hydrogen phosphate product has stable and high quality; and an ammonia-containing solution is produced with the production of dicalcium phosphate, and can be used for regeneration of an extractant melamine.

Description

technical field [0001] The invention relates to a method for preparing feed grade calcium hydrogen phosphate by decomposing phosphate rock with hydrochloric acid. Background technique [0002] At present, the production methods of calcium hydrogen phosphate mainly include sulfuric acid method, nitric acid method and hydrochloric acid method. [0003] The sulfuric acid method is to use sulfuric acid to decompose into phosphoric acid and water-insoluble calcium sulfate crystals, and then use phosphoric acid and ammonia to neutralize the reaction to produce ammonium phosphate. Although the sulfuric acid method has a simple process and low cost, it also has many disadvantages, such as: the obtained phosphoric acid concentration is low, and the phosphorus yield is not high; the grade requirements for phosphate rock are high, especially for the content of impurities such as magnesium oxide and chloride ions in the ore. The requirements are strict; due to the lack of sulfur resourc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32
Inventor 廖吉星朱飞武潘礼富周勇彭宝林王先炜宋同彬张丽谢静韩朝应郑超
Owner GUIZHOU KAILIN GRP CO LTD
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