Preparation method of feed grade calcium phosphate salt

A calcium phosphate, feed-grade technology, applied in the field of phosphorus chemical industry, can solve the problems of high purification cost of production process and low removal efficiency of heavy metals, and achieve the effect of reducing adverse effects and improving product purity

Active Publication Date: 2020-01-21
SINOCHEM YUNLONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of feed grade calcium phosphate salt, which solves the problems of high purification cost and low removal efficiency of heavy metals such as As, Pb, Cd and Cr in phosphoric acid in the existing DCP and MCP production processes

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  • Preparation method of feed grade calcium phosphate salt

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Experimental program
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Effect test

Embodiment 1

[0035] Step a: with P 2 o 5 Dilute phosphoric acid A with a concentration of 15% is used as a raw material, and HF and 40% of the total mass of iron, aluminum and magnesium are added with HF and 40% of NaF to remove the iron, aluminum and magnesium cations in the dilute phosphoric acid to obtain clarified dilute phosphoric acid B for subsequent use;

[0036] Step b: The clarified dilute phosphoric acid B is neutralized with the mixed slurry containing 30% calcium carbonate and calcium bicarbonate to adjust the pH of the dilute phosphoric acid to 3.0, and at the same time add ammonium persulfate in an amount of 5 times the theoretical amount. The reaction time is 2 hours, the reaction temperature is 60°C, the neutralized slag is separated by sedimentation, and the supernatant C is set aside;

[0037]Step c: Serum C is mixed with 0.001% BPBP antiscalant and enters membrane purification device A. A group of protein membranes is assembled in membrane purification device A. The ad...

Embodiment 2

[0042] Step a: with P 2 o 5 Dilute phosphoric acid A with a concentration of 20% is used as a raw material, and HF with 80% iron, aluminum and magnesium mass and 30% KF are added to remove iron, aluminum and magnesium cations in the dilute phosphoric acid to obtain clarified dilute phosphoric acid B for later use;

[0043] Step b: Neutralize the clarified dilute phosphoric acid B with the mixed slurry containing 50% calcium hydrogen phosphate, adjust the pH of dilute phosphoric acid to 2.7, and add perchloric acid at the same time, the addition amount is 20 times the theoretical amount, and the reaction time is 1.5h , the reaction temperature is 60°C, the neutralized slag is separated by sedimentation, and the supernatant C is set aside;

[0044] Step c: The supernatant C is mixed with 0.005% PBTCA antiscalant and enters the membrane purification device A. The membrane purification device A is equipped with 2 sets of protein membranes, and the adsorption capacity of a single ...

Embodiment 3

[0049] Step a: with P 2 o 5 Dilute phosphoric acid A with a concentration of 20% is used as raw material, and 100% NaF and 100% NH of iron, aluminum and magnesium are added. 4 F, removing iron, aluminum and magnesium cations in dilute phosphoric acid to obtain clarified dilute phosphoric acid B for subsequent use;

[0050] Step b: Neutralize the clarified dilute phosphoric acid B with 90% calcium hydroxide containing water, adjust the pH of the dilute phosphoric acid to 2.3, and add potassium permanganate at the same time, the amount added is 50 times the theoretical amount, the reaction time is 2.5h, The temperature is 70°C, the neutralized slag is separated by sedimentation, and the supernatant C is used for later use;

[0051] Step c: Serum C is mixed with 0.0071% HEDP antiscalant and enters membrane purification device A. Membrane purification device A is equipped with 3 groups of protein membranes. The adsorption capacity of a single group of protein membranes reaches 2...

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Abstract

The invention discloses a preparation method of feed-grade calcium phosphate salt. The method comprises the following steps: a, precipitating and separating iron, aluminum and magnesium in dilute phosphoric acid; b, neutralizing and oxidizing calcium-containing slurry, and removing impurities; c, purifying clear liquid via a membrane and reducing to prepare calcium hydrogen phosphate; and d, oxidizing and chelating concentrated phosphoric acid, purifying concentrated phosphoric acid via the membrane, reducing and then reacting the concentrated phosphoric acid with calcium hydrogen phosphate toprepare calcium dihydrogen phosphate. Through the preparation method of the feed-grade calcium phosphate salt product, the content of heavy metals in phosphoric acid is reduced through three stages of removing impurities, so that the feed-grade calcium phosphate salt product with low content of heavy metals is obtained; coproduction of DCP and MCP can be achieved; the preparation method has the characteristics of simple process, high purification pertinence, high efficiency and low cost, and can be popularized and used in feed-grade calcium phosphate producing enterprises.

Description

technical field [0001] The invention relates to the technical field of phosphorus chemical industry, in particular to a preparation method of feed grade calcium phosphate. Background technique [0002] Phosphorus is an important life element, and calcium phosphate salt is used as an important feed additive to provide sufficient calcium and phosphorus elements for animal bone growth. Feed-grade calcium phosphate salts with large market demand include calcium hydrogen phosphate (DCP) and calcium dihydrogen phosphate (MCP). Among them, DCP is mostly directly produced by dilute acid neutralization method. Firstly, calcium carbonate or quicklime is used to adjust the pH value of dilute phosphoric acid. To 2.2~2.5, precipitate to remove about 80% of the impurities in the solution, and then further increase the pH to 2.8~3.3%, to obtain P 2 o 5 / F ≥ 300 slurry, after clarification, the clear liquid is neutralized with lime milk and dried to obtain DCP products; MCP mostly uses co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32A23K20/26
CPCA23K20/26C01B25/321C01B25/322C01B25/325C01P2006/80
Inventor 田萍盛勇付全军刘廷兵周佩马先林张长明吴世琴颜跃勇
Owner SINOCHEM YUNLONG
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