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Production method of calcium superphosphate

A production method, general calcium technology, applied in the field of high-magnesium general calcium production, can solve problems such as economic loss and phosphorus value not being reflected, and achieve the effects of low production cost, increased added value, and huge economic benefits

Inactive Publication Date: 2015-07-08
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the phosphoric acid purification process, a large amount of sludge produced is a problem in the phosphorus chemical industry. If it is simply treated and sold as low-end ordinary calcium, it will cause huge economic losses because the value of phosphorus cannot be reflected. Therefore, how to use it The sludge produced in the purification process of concentrated phosphoric acid is a matter of great concern to the practitioners of phosphorus chemical industry

Method used

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  • Production method of calcium superphosphate

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Effect test

Embodiment 1

[0022] Get 150g concentrated phosphoric acid sludge, its total P 2 o 5 21.2%, water soluble P 2 o 5 is 18.3%, add water to adjust the slurry concentration to 25%, add 65g of phosphate ore flotation tailings, the P in the tailings 2 o 5 8.2% magnesium oxide and 15.1% magnesium oxide. After stirring evenly, add 20g magnesium oxide and 20g calcium powder. After reacting for 15 minutes, dry the materials to obtain high-magnesium general calcium products. After analysis, the main components of the product are: total P 2 o 5 The content of free acid is 0, the content of magnesium oxide is 10.4%, and the content of sulfate is 10.3%. The product quality meets the requirements of high magnesium general calcium in the New Zealand market.

Embodiment 2

[0024] Get 150g concentrated phosphoric acid sludge, its total P 2 o 5 21.2%, water soluble P 2 o 5 is 18.3%, add water to adjust the slurry concentration to 25%, add 90g phosphate ore flotation tailings, the P in the tailings 2 o 5 8.2% magnesium oxide and 15.1% magnesium oxide. After stirring evenly, add 25g magnesium oxide and 20g calcium powder. After reacting for 20 minutes, dry the materials to obtain high-magnesium general calcium products. After analysis, the main components of the product are: total P 2 o 5 The content of free acid is 15.8%, the content of free acid is 0, the content of magnesium oxide is 12.7%, and the content of sulfate radical is 9.3%. The product quality meets the requirements of high magnesium general calcium in the New Zealand market.

Embodiment 3

[0026] Get 150g concentrated phosphoric acid sludge, its total P 2 o 5 21.2%, water soluble P 2 o 5 is 18.3%, add water to adjust the slurry concentration to 25%, add 70g of phosphate ore flotation tailings, the P in the tailings 2 o 5 It is 8.2% and magnesium oxide is 15.1%. After stirring evenly, add 15g of magnesium oxide and 25g of calcium powder. After reacting for 60 minutes, the materials are dried to obtain high-magnesium general calcium products. After analysis, the main components of the product are: total P 2 o 5 The content of free acid is 0, the content of magnesium oxide is 11.3%, and the content of sulfate is 10.7%. The product quality meets the requirements of high magnesium general calcium in the New Zealand market.

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Abstract

The invention discloses a production method of calcium superphosphate. In the method, sludge dreg after plate-frame filtration of strong phosphoric acid is mixed with the sludge dreg generated during concentration of wet-process phosphoric acid according to a certain proportion to consume the sludge dreg so that guarantee of purification and gradient utilization of phosphoric acid is provided. The sludge dreg is blended with water and then is added with a proper amount of tailing powder of phosphors ore, magnesium powder and calcium carbonate. After a reaction for a certain time, the reacted material is fed to a drying section to obtain a dried product. The dried product is sieved and packaged to obtain the high-magnesium calcium superphosphate. The method can recycle the elements of phosphorus and magnesium in tailings of phosphorus ore floatation, thereby turning the waste into resources and further increasing additional value of the phosphorus ore. What is more, the method can be used for preparing high-quality calcium superphosphate product, is low in production cost, and can achieve huge economic, social and environmental-protective benefits.

Description

technical field [0001] The invention relates to a high-magnesium general calcium product, in particular to a method for producing high-magnesium general calcium by using concentrated phosphoric acid sludge and phosphate ore flotation tailings as raw materials. Background technique [0002] With the saturation of the domestic ammonium phosphate market, the domestic sales of ordinary diammonium phosphate are in crisis, while the demand for diammonium phosphate in the international market is relatively considerable, but the quality requirements for diammonium phosphate are relatively high. In order to meet the production of high-end diammonium phosphate , the primary solution is to improve the quality of phosphoric acid, phosphoric acid purification is particularly important. In the phosphoric acid purification process, a large amount of sludge produced is a problem in the phosphorus chemical industry. If it is simply treated and sold as low-end ordinary calcium, it will cause...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B1/02B09B3/00
CPCC05B1/02C05B9/00
Inventor 胡国涛李红林赵建勇付勇宋子瞻晋华饶轶晟雷学联甘雄
Owner WENGFU (GRP) CO LTD
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