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A kind of 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 low phosphorus and magnesium content, high product cost, and large amount of raffinate, and achieve low product cost , low cost, and obvious environmental benefits

Active Publication Date: 2017-03-08
WENGFU (GRP) CO LTD
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Problems solved by technology

[0004] In the patent document with the application number 200810058958.0, "Method for Directly Preparing Phosphate and Magnesium Fertilizer Using Phosphate Rock Flotation By-product Tailings" is disclosed. , but the product cost is high, and the content of phosphorus and magnesium in the product is low
[0005] In the patent document with the application number 201010608653.X, "Method for preparing phosphorus-magnesium composite fertilizer by using raffinate acid and high-magnesium phosphorus tailings slag" is disclosed. This patent uses raffinate acid and high-magnesium phosphorus tailings slag to prepare phosphorus magnesium. Compound fertilizer, but the amount of raffinate used is large and the cost of the product is high

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  • A kind of method for preparing phosphorus magnesium fertilizer

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

[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 o 5The 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 reaches the standard; add sulfuric acid with a dry basis mass of the 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 ...

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 wastewater with a pH value of 3 for neutralization and precipitation reaction, and filter the feed liquid until 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 meets the standard; add sulfuric acid with 10% of the dry mass of the solid phase slag to the solid phase slag obtained from the filtration 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 eff...

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Abstract

The invention discloses a method for preparing phosphorus-magnesium fertilizer. In the method, high-magnesium phosphorus tailings are calcined at 880-1200° C. to obtain calcined white; the calcined white is added to acid phosphorus-containing wastewater in the phosphate fertilizer industry for neutralization and precipitation reaction. When the pH value of the feed liquid is 7-10, the feed liquid is filtered to obtain the clear liquid and phosphorus-containing magnesium solid phase slag, and the clear liquid is returned to the phosphate fertilizer production system or discharged up to the standard; the solid phase slag is added to the filtered phosphorus-containing magnesium solid phase slag React 0.1-10h with sulfuric acid with a mass of 10%-45% on a dry basis. After the reaction, the reactant is dried and pulverized to obtain a phosphorus-magnesium fertilizer product. The invention has the characteristics of reducing waste water treatment cost, recycling phosphorus and magnesium resources in waste, low product cost and good economic benefit.

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 Patents(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