Method for preparing phosphorus-magnesium fertilizer

A technology of phosphate magnesium fertilizer and phosphate fertilizer, which is applied in the direction of magnesium phosphate fertilizer, phosphate fertilizer, magnesium bisphosphate fertilizer, etc., can solve the problems of high product cost and large amount of raffinate, and achieve the effect of low cost and reduced treatment cost

Active Publication Date: 2015-03-04
WENGFU (GRP) CO LTD
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[0005] In the patent document whose application number is 201010608653.X, "The method for preparing phosphorus-magnesium compound fertilizer by using raffinate acid and high-magnesium phosphorus tailings slag" is disclosed. The mixed reaction of raffinate and high-magnesium phosphorus tailings slag is used to prepare phosphorus-magnesium compound fertilizer, but the use of raffinate is large and the product cost is high

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  • Method for preparing phosphorus-magnesium fertilizer

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[0032] The above-mentioned method for preparing phosphorus and magnesium fertilizers, wherein: high-magnesium phosphorus tailings are low-grade phosphorus pentoxide-containing minerals discharged after obtaining high-grade phosphorus pentoxide concentrate in the process of phosphate ore dressing.

[0033] The above-mentioned preparation method of a phosphorus magnesium fertilizer, wherein: the powdery phosphorus magnesium fertilizer product is granulated on a disc granulator or a drum granulator, dried and sieved to obtain a granular phosphorus magnesium fertilizer product.

Embodiment 1

[0036] Will P 2 o5 The high-magnesium phosphorus tailings with a content of 7.0% and a MgO content of 16.9% were calcined at 960 °C to obtain calcined white with a quality of 61% of the high-magnesium phosphorus tailings. 2 o 5 Add 104kg of the above-mentioned calcined white to the 1t phosphate fertilizer industrial acid phosphorus-containing waste water with a content of 4.0% and a pH value of 1.5 for neutralization and precipitation reaction, and filter the feed liquid when the pH value of the feed liquid is 8 to obtain clear liquid and phosphorus-containing magnesium solids. Phase slag (mass of about 135kg on a dry basis), the clear liquid is returned to the phosphate fertilizer production system or discharged when it meets the standard; add sulfuric acid with a dry basis mass of solid phase slag of 35% to the solid phase slag obtained from the filtration for 0.5h, and after the reaction, the reaction The product is dried and pulverized to obtain a specification of about 1...

Embodiment 2

[0038] Will P 2 o 5 The high-magnesium phosphorus tailings with 2.0% content and 21.0% MgO content were calcined at 1200 °C to obtain calcined white with a quality of 56% of the high-magnesium phosphorus tailings. 2 o 5 Add 30kg of the above-mentioned calcined white to 1t of phosphate fertilizer industrial acid phosphorus-containing waste water with a pH value of 3 for neutralization and precipitation reaction, and filter the feed liquid when the pH value of the feed liquid is 7 to obtain clear liquid and phosphorus-containing magnesium solids. Phase slag (mass of about 51kg on a dry basis), the clear liquid is returned to the phosphate fertilizer production system or discharged when it reaches the standard; add sulfuric acid with 10% of the dry mass of the solid phase slag to the solid phase slag obtained by filtering for 0.1h, and after the reaction, the reaction After the material is dried and crushed, it is granulated on a disc granulator to obtain about 58kg of effectiv...

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Abstract

The invention discloses a method for preparing a phosphorus-magnesium fertilizer, which comprises the following steps: calcining high-magnesium phosphorus tailings at 880-1200 DEG C to obtain calcined dolomite; adding the calcined dolomite into phosphate fertilizer industrial acidic phosphorus-containing wastewater to perform neutralization and precipitation reaction until the pH value of the solution is 7-10, filtering the solution to obtain a clear solution and phosphorus / magnesium-containing solid-phase slag, and returning the clear solution to a phosphorus fertilizer production system or discharging after reaching the standard; and adding sulfuric acid, which accounts for 10-45 wt% of the solid-phase slag on dry basis, into the phosphorus / magnesium-containing solid-phase slag to react for 0.1-10 hours, drying the reaction product, and pulverizing to obtain the phosphorus-magnesium fertilizer. The method has the characteristics of lower wastewater treatment cost, low product cost and favorable economic benefit, and can recycle phosphorus and magnesium resources in the waste.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing phosphorus-magnesium fertilizer by using high-magnesium phosphorus tailings to treat acid phosphorus-containing wastewater in the phosphate fertilizer industry. Background technique [0002] High-magnesium phosphorus tailings are low-grade phosphorus pentoxide-containing tailings discharged from phosphate ore after obtaining high-grade phosphorus pentoxide concentrate during the beneficiation process. The main phases are fluorapatite and dolomite. P 2 o 5 The content is 4% to 8%, and the MgO content is 15% to 19%, which belongs to high magnesium and low grade phosphate rock. For a concentrator with an annual output of 4 million tons of phosphorus concentrate, about 1.2 million tons of high-magnesium phosphorus tailings can be produced each year, containing about 50,000 to 100,000 tons of P 2 o 5 , about 150,000 to 250,000 tons of MgO, rich in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B9/00B09B3/00
CPCC05B9/00B09B3/40
Inventor 刘旭王邵东解田胡宏石玲元杨俊龙庆兰
Owner WENGFU (GRP) CO LTD
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