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Low-temperature drying method for feed-grade calcium hydrogen phosphate

A technology of calcium hydrogen phosphate and drying method, which is applied in the field of phosphate, can solve the problems of increased investment, loss of crystal water, increased consumption, etc., and achieves the effects of reliable operability, high drying efficiency and simple method

Active Publication Date: 2013-11-13
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing production of feed grade phosphate, its drying mainly adopts methods such as airflow drying and spray drying. Drying by heating will bring in ash during the drying process. At the same time, due to the high heating temperature, the two crystal waters in the product may be lost. Both situations can affect the quality of the product, thereby affecting the price of the product.
If indirect heating is used, it will increase the heat transfer area, increase investment and increase consumption

Method used

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  • Low-temperature drying method for feed-grade calcium hydrogen phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A low-temperature drying method of feed grade calcium hydrogen phosphate, it comprises the steps:

[0017] (1) Distribute 300 kg of centrifuged feed grade calcium hydrogen phosphate evenly on the conveyor belt through the feeder;

[0018] (2) Feed-grade calcium hydrogen phosphate is sent to the microwave heater at a uniform speed by the conveyor belt for drying, and at the same time, the exhaust system is activated to discharge the gas in the microwave equipment after passing through the cyclone dust collector; among them: the microwave heater is composed of 6 microwave sources Composition; the drying temperature is controlled at 55°C; the thickness of the conveyed product on the belt is 15mm;

[0019] (3) Send the feed-grade calcium hydrogen phosphate dried by microwave dryer into a sealed cooling box for cooling, and after cooling, it will be crushed by the crushing packaging system and packaged into finished products.

[0020] The conveying speed of the above-mentio...

Embodiment 2

[0023] A low-temperature drying method of feed grade calcium hydrogen phosphate, it comprises the steps:

[0024] (1) Distribute 300 kg of centrifuged feed grade calcium hydrogen phosphate evenly on the conveyor belt through the feeder;

[0025] (2) Feed-grade calcium hydrogen phosphate is sent to the microwave heater at a uniform speed by the conveyor belt for drying, and at the same time, the exhaust system is activated to discharge the gas in the microwave equipment after passing through the cyclone dust collector; among them: the microwave heater is composed of 8 microwave sources Composition; the drying temperature is controlled at 65°C; the thickness of the conveyed product on the belt is 20mm;

[0026] (3) Send the feed-grade calcium hydrogen phosphate dried by microwave dryer into a sealed cooling box for cooling, and after cooling, it will be crushed by the crushing packaging system and packaged into finished products.

[0027] The conveying speed of the above-mentio...

Embodiment 3

[0030] A low-temperature drying method of feed grade calcium hydrogen phosphate, it comprises the steps:

[0031] (1) Distribute 300 kg of centrifuged feed grade calcium hydrogen phosphate evenly on the conveyor belt through the feeder;

[0032] (2) Feed-grade calcium hydrogen phosphate is sent to the microwave heater at a uniform speed by the conveyor belt for drying, and at the same time, the exhaust system is activated to discharge the gas in the microwave equipment after passing through the cyclone dust collector; among them: the microwave heater is composed of 7 microwave sources Composition; the drying temperature is controlled at 60°C; the thickness of the conveyed product on the belt is 18mm;

[0033] (3) Send the feed-grade calcium hydrogen phosphate dried by microwave dryer into a sealed cooling box for cooling, and after cooling, it will be crushed by the crushing packaging system and packaged into finished products.

[0034] The conveying speed of the above-mentio...

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Abstract

The invention discloses a low-temperature drying method for feed-grade calcium hydrogen phosphate, which is characterized by comprising the following steps: (1) centrifuging the feed-grade calcium hydrogen phosphate, and then uniformly distributing onto a conveying belt through a feeding machine; (2) sending the feed-grade calcium hydrogen phosphate into a microwave heater for drying by the conveying belt at a constant speed, meanwhile starting an exhausting system, and exhausting the gas in the microwave equipment by passing the gas through a cyclone dust collector, wherein the microwave heater is formed by microwave sources, the number of the microwave sources can be determined according to needs, the drying temperature is controlled at 55-65 DEG C, and the thickness of the conveying product on the belt is 15-20mm; and (3) sending the feed-grade calcium hydrogen phosphate which is dried by the microwave heater to a sealed cooling tank to cool down, crushing by using a crusher after cooling; and then packaging to obtain a finished product. According to the invention, a microwave drying technology is utilized, and the low temperature drying method is simple and has high drying efficiency, low cost and reliable operability. In addition, the feed-grade calcium hydrogen phosphate is dried at about 60 DEG C, thus the product quality is guaranteed.

Description

technical field [0001] The invention relates to phosphate, in particular to the field of drying for preparing feed-grade calcium hydrogen phosphate from phosphorus-containing wastewater. Background technique [0002] The price of feed-grade phosphate in the market is affected by the phosphorus content in the product, and generally the higher the phosphorus content, the higher the price. Therefore, it is very important to choose a suitable drying system to ensure the quality of the product. [0003] In the existing production of feed grade phosphate, its drying mainly adopts airflow drying, spray drying and other methods. In the drying process, the general heat source is coal combustion and then directly heated for drying, so that ash will be brought in during the drying process. At the same time Since the high heating temperature may cause the loss of two crystal waters in the product, both situations can affect the quality of the product, thereby affecting the price of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32
Inventor 杨毅赵建勇周智武李志坚胡国涛丁川饶轶晟赵大玲
Owner WENGFU (GRP) CO LTD