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Method for removing magnesium oxide in phosphate concentrate through phosphatic fertilizer and phosphorus chemical industry acid wastewater

A technology of acidic wastewater and phosphate concentrate, which is applied to the treatment of phosphate materials and can solve the problems of no patent application

Inactive Publication Date: 2012-12-26
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After retrieval, so far there is no patent application on the use of phosphate fertilizers and phosphate chemical acid wastewater to remove magnesium oxide from phosphorus concentrates, and there is no related report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 1000kg acid waste water (P 2 o 5 The mass percentage content is 3.5%, the F mass percentage content is 0.7%, and the pH value is 1.7) and 500kg of phosphorus concentrate slurry with a solid content of 60% (dry basis phosphorus concentrate P 2 o 5 The mass percentage content is 31.5%, the MgO mass percentage content is 1.45%), and the reaction is stirred at 40°C for 2h. After the reaction is finished, the slurry is separated from the solid and liquid to obtain 303kg of solid phase and 8% of acidic waste water, of which P in the dry basis of phosphorous concentrate 2 o 5 The mass percentage content is 33.4%, and the MgO mass percentage content is 0.45%. In this embodiment, the magnesium removal rate of the phosphorus concentrate is about 71.2%, and the phosphorus loss rate is about 1.5%.

Embodiment 2

[0020] Add 1000kg acid waste water (P 2 o 5 The mass percentage content is 1.5%, the F mass percentage content is 0.4%, and the pH value is 2.5) and 286kg of phosphorus concentrate slurry with a solid content of 70% (dry basis phosphorus concentrate P 2 o 5 The mass percentage content is 26%, the MgO mass percentage content is 3.28%), and the reaction is stirred at 50°C for 6h. After the reaction is finished, the slurry is separated from the solid and liquid to obtain 293kg of solid phase and 40% of acidic waste water. 2 o 5 The mass percentage content is 29.0%, and the MgO mass percentage content is 0.69%. In this embodiment, the magnesium removal rate of the phosphorus concentrate is about 81.5%, and the phosphorus loss rate is about 1.9%. Considering that the 40% acidic wastewater contained in the solid phase phosphorus concentrate is brought into part of the phosphorus, on the whole, the solid phase water containing phosphorus The total phosphorus content of the conce...

Embodiment 3

[0022] Add 1000kg acid waste water (P 2 o 5 The mass percentage content is 6%, the F mass percentage content is 1.6%, and the pH value is 0.8) and 2000kg of phosphorus concentrate slurry with a solid content of 50% (dry basis phosphorus concentrate P 2 o 5 The mass percentage content is 32.5%, the MgO mass percentage content is 0.7%), and react at 15°C for 0.5h. After the reaction, the slurry was separated from the solid and liquid to obtain a solid phase of 1400kg containing 30% of acidic waste water. 2 o 5 The mass percentage content is 32.9%, and the MgO mass percentage content is 0.26%. In this embodiment, the magnesium removal rate of the phosphorus concentrate is about 63.3%, and the phosphorus loss rate is about 0.8%. Considering that the 30% acidic wastewater contained in the solid-phase phosphorus concentrate brings in part of the phosphorus, on the whole, the solid-phase water-containing phosphorus The total phosphorus content of the concentrate is about 3.2% hi...

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Abstract

The invention discloses a method for removing magnesium oxide in phosphate concentrate through phosphatic fertilizer and phosphorus chemical industry acid wastewater. The method comprises the steps as follows: adding the acid wastewater and the phosphate concentrate pulp to a reacting groove to be reacted for 0.5 to 6 hours at 15 to 50 DEG C, so as to obtain reactive size; carrying out solid-liquid separation to the reactive size, wherein the solid phase produced by the separation is the phosphate concentrate with the magnesium oxide removed; and then preparing via a phosphoric acid by wet process. The method provided by the invention is simple in technology, easy to operate in the reaction, high in removal rate of magnesium oxide, low in loss ratio of the phosphorus in the phosphate concentrate, and high in economy.

Description

technical field [0001] The invention relates to waste water recycling, in particular to a method for removing magnesium oxide in phosphorus concentrate by using phosphate fertilizer and acid waste water from a phosphate chemical industry. Background technique [0002] Phosphate rock is an important mineral resource, mainly used in the production of phosphoric acid, phosphate fertilizer and phosphate products. Since most of the phosphate rocks in our country are medium and low-grade ores, these ores contain a lot of impurities, and it is difficult to obtain high-quality phosphoric acid by using the conventional dihydrate process. The presence of impurities such as magnesium, aluminum and iron in phosphate rock, especially magnesium, will bring a series of extremely adverse effects on the wet processing of phosphate rock. Since the magnesium salt in phosphate rock will be completely dissolved in the phosphoric acid solution in the production of wet-process phosphoric acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01
Inventor 刘旭杨三可胡厚美张仁忠王景峰柳玉松
Owner WENGFU (GRP) CO LTD
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