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Method for preparing fodder-grade calcium hydrogen phosphate or fodder-grade calcium hydrogen phosphate type III

A technology of calcium dihydrogen phosphate and calcium hydrogen phosphate, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of restricting the development of feed-grade calcium phosphate salt, environmental pressure, and long production process. Achieve the effects of high yield, low production cost and low energy consumption

Inactive Publication Date: 2012-06-27
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the production process of feed-grade calcium dihydrogen phosphate or calcium hydrogen phosphate III has been improved and promoted, showing the trend and direction of replacing thermal phosphoric acid with wet-process phosphoric acid, but there are still problems of using thermal phosphoric acid and wet-process phosphoric acid. The production of calcium hydrogen phosphate semi-finished products by French phosphoric acid brings many technical problems. At the same time, a large amount of white manure and mother liquor will be produced in the production process. The environmental pressure will be greatly affected, and the production process is long, the phosphorus yield is low, and the production cost is high. , thus restricting the development of feed grade calcium phosphate

Method used

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  • Method for preparing fodder-grade calcium hydrogen phosphate or fodder-grade calcium hydrogen phosphate type III
  • Method for preparing fodder-grade calcium hydrogen phosphate or fodder-grade calcium hydrogen phosphate type III

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 adopts the inventive method to produce powdery feed grade calcium dihydrogen phosphate

[0034] The method proceeds as follows:

[0035] 1. Heating of pretreated phosphoric acid and neutralization of calcium powder to make pulp;

[0036] 2. Spraying and secondary drying of slurry;

[0037] 3. Screening and crushing of powdery materials, cooling and packaging of finished products.

[0038] The quality indicators of pretreated phosphoric acid and heavy calcium (calcium carbonate) powder are shown in Table 1.

[0039] The quality of table 1 pretreatment phosphoric acid and heavy calcium (calcium carbonate) powder

[0040]

[0041] 1. Heating of pretreated phosphoric acid and neutralization of calcium powder to make pulp

[0042] ① Pretreatment wet process phosphoric acid comes from phosphoric acid storage tank, P 2 o5 Concentration 35.2% (mass concentration, the same below), specific gravity 1.40g / ml, temperature 40°C; at 27.9m 3 The flow rate per hou...

Embodiment 2

[0052] [0052] Embodiment 2 adopts the inventive method to produce powdery feed grade calcium hydrogen phosphate III type

[0053] Follow these steps:

[0054] 1. Heating of pretreated phosphoric acid and neutralization of calcium powder to make pulp;

[0055] 2. Spraying and secondary drying of slurry;

[0056] 3. Screening and crushing of powdery materials, cooling and packaging of finished products.

[0057] The quality indicators of pretreated phosphoric acid and heavy calcium (calcium carbonate) powder are shown in Table 3.

[0058] The quality index of table 3 pretreatment phosphoric acid and heavy calcium (calcium carbonate) powder

[0059]

[0060] 1. Heating of pretreated phosphoric acid and neutralization of calcium powder to make pulp

[0061] ① Pretreatment wet process phosphoric acid comes from phosphoric acid storage tank, P 2 o 5 The concentration is 30.5%, the specific gravity is 1.33g / ml, the temperature is 40°C; at 33.305m 3 The flow rate per hour ...

Embodiment 3

[0071] Embodiment 3 adopts the inventive method to produce granular feed grade calcium hydrogen phosphate III type

[0072] Follow these steps:

[0073] 1. Heating of pretreated phosphoric acid and neutralization of calcium powder to make pulp;

[0074] 2. Spraying, granulation and secondary drying of slurry;

[0075] 3. Screening and crushing of granular materials, cooling and packaging of finished products.

[0076] The quality index of pretreatment phosphoric acid and heavy calcium (calcium carbonate) powder is as shown in table 5.

[0077] The quality index of table 5 pretreatment phosphoric acid and heavy calcium (calcium carbonate) powder

[0078]

[0079] 1. Heating of pretreated phosphoric acid and neutralization of calcium powder to make pulp

[0080] ① Pretreatment wet process phosphoric acid comes from phosphoric acid storage tank, P 2 o 5 The concentration is 33.0%, the specific gravity is 1.36g / ml, the temperature is 40°C; at 30.10m 3 The flow rate per h...

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Abstract

The invention relates to a method for preparing fodder-grade calcium hydrogen phosphate or fodder-grade calcium hydrogen phosphate type III, which belongs to the field of fodder, and aims to solve the technical problem and provide a method for preparing fodder-grade calcium hydrogen phosphate or fodder-grade calcium hydrogen phosphate type III with lower cost. The method for preparing fodder-grade calcium hydrogen phosphate or fodder-grade calcium hydrogen phosphate type III comprises the following steps that: a. pulp is prepared; phosphoric acid is adopted to react with a compound containing calcium, and slurry is prepared; b. primary drying: the slurry is sprayed and dried, and a semi-finished product is obtained, wherein the temperature of hot air or flue gas in spraying and drying at the inlet of a drying tower is 450DEG C to 650DEG C, and the temperature of tail gas at the outlet of the drying tower is 85DEG C to 105DEG C; and c. secondary drying: the semi-finished product is dried, and the fodder-grade calcium hydrogen phosphate or the fodder-grade calcium hydrogen phosphate type III is obtained, wherein the temperature of the hot air or the flue gas at the inlet of a dryer is 400DEG C to 550DEG C, and the temperature of the tail gas at the outlet of the dryer is 75DEG C to 105DEG C.

Description

technical field [0001] The invention relates to a method for producing feed grade calcium dihydrogen phosphate or feed grade calcium hydrogen phosphate type III, belonging to the field of feed. Background technique [0002] The main varieties of feed grade calcium phosphate salts are tricalcium phosphate, calcium hydrogen phosphate, and calcium dihydrogen phosphate, all of which are nutritional additives of mineral elements. Among them, calcium dihydrogen phosphate (MCP) is an excellent high-efficiency phosphate feed additive with high phosphorus content and high water solubility. It is a supplement of phosphorus and calcium for animals. It has the characteristics of high biological potency and is widely used It is used as phosphorus and calcium additives for aquatic animals. The test shows that calcium dihydrogen phosphate is the best among calcium phosphate salts in the utilization rate of phosphorus by aquatic animals. The utilization rate of phosphorus reaches 98%, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 李进王佳才李子军赵小林李顺方石建华
Owner GUIZHOU CHANHEN CHEM CO LTD
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