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Method for preparing calcium magnesium phosphate fertilizer by utilizing phosphorite flotation tailing blast furnace method

A calcium-magnesium-phosphate fertilizer and blast furnace technology, applied in phosphate fertilizers, Thomas phosphate fertilizers, applications, etc., can solve problems such as hidden safety hazards, environmental pollution, occupation of land resources, etc., and achieve economic feasibility, reduce production costs, and save phosphorus resources.

Inactive Publication Date: 2010-06-23
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stockpiling of a large amount of floating phosphorus tailings not only occupies a large amou

Method used

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  • Method for preparing calcium magnesium phosphate fertilizer by utilizing phosphorite flotation tailing blast furnace method
  • Method for preparing calcium magnesium phosphate fertilizer by utilizing phosphorite flotation tailing blast furnace method
  • Method for preparing calcium magnesium phosphate fertilizer by utilizing phosphorite flotation tailing blast furnace method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this example, using phosphate rock flotation tailings as the main raw material, the production process and operation control steps of preparing calcium magnesium phosphate fertilizer by blast furnace are as follows:

[0022] (1) Preparation of phosphorous tailings raw materials

[0023] Use flotation phosphorus tailings slurry as raw material, dehydrate through thickener and filter to obtain flotation tailings filter cake with water content of 20-40%; use the filter cake or wet tailings stockpiled in tailings pond Granulator granulation (material particle size is 10 ~ 50mm); it is dried and dehydrated with a drier to obtain phosphorous tailings granules with a water content of 2 o 5 ) is 8 to 12%,). The production process is attached figure 1 .

[0024] (2) Preparation of raw materials for furnace melting

[0025] Primary phosphate rock W(P 2 o 5 ≥23%), coal, snakebite, and silica are crushed into lumps with a particle size of 30-60mm. The various minerals and...

Embodiment 2

[0036] (1) Chemical composition of flotation phosphorus tailings and phosphate rock raw materials

[0037] Typical chemical composition (mass %) of flotation phosphorus tailings and furnace phosphate rock raw materials used in this example

[0038] chemical composition

P 2 o 5

MgO

CaO

SiO 2

Flotation tailings

9.20

12.10

29.60

8.10

Phosphate Rock Raw Materials

15.50

10.80

32.80

12.35

[0039] (2) The production process and operation steps of calcium magnesium phosphate fertilizer prepared by cyclone furnace

[0040] Production flow and operation control step are identical with embodiment 1, and process flow chart is as figure 1 , figure 2 .

[0041] (3) Typical process conditions of this example

[0042] Typical process conditions for this example

[0043] Melting temperature (℃)

1370

Melting time (min)

38

Quenching temperature (℃)

30

...

Embodiment 3

[0048] (1) Chemical composition of flotation phosphorus tailings and phosphate rock raw materials

[0049]Typical chemical composition (mass %) of flotation phosphorus tailings and furnace phosphate rock raw materials used in this example

[0050] chemical composition

P 2 o 5

MgO

CaO

SiO 2

Flotation tailings

9.60

11.30

30.86

9.15

Phosphate Rock Raw Materials

15.90

10.76

32.26

12.85

[0051] (2) The production process and operation steps of calcium magnesium phosphate fertilizer prepared by cyclone furnace

[0052] Production flow and operation control step are identical with embodiment 1, and process flow chart is as figure 1 , figure 2 .

[0053] (3) Typical process conditions of this example

[0054] Typical process conditions for this example

[0055] Melting temperature (℃)

1380

Melting time (min)

40

Quenching temperature (℃)

35

...

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Abstract

The invention relates to a method for preparing calcium magnesium phosphate fertilizer by utilizing phosphorite floatation blast furnace method, belonging to the phosphate chemical technical field. The method includes that: (1) floatation tailing pulp is taken as raw material, pulp mesome contains 8-12wt% of P2O5 and is treated to obtain tailing filter cake, the moisture content of the tailing filter cake is controlled to be 20-40%; (2) the filter cake obtained by step (1) is pelletized by a pelletizer, particle size is 10-40mm, and drying by a drying machine is carried out until the moisture content is less than 5%; (3) other primary phosphorite, silica and coke which are burned together are respectively smashed into lump material with the particle size of 30-60mm; (4) the mass ratio of the flotation phosphorus tailing and other phosphorite raw material is 100:8-9; (5) molten raw material mixed by the ratio is added into the blast furnace; (6) the raw material obtained by the step (5) is used for preparing calcium magnesium phosphate fertilizer by adopting blast furnace method. The invention has available raw materials and low cost; no sulphuric acid or phosphoric acid is consumed, product quality is reliable, the method is economic and feasible and has obvious social benefit.

Description

technical field [0001] The invention belongs to the technical field of phosphate fertilizer chemical industry, and particularly relates to a method for preparing calcium-magnesium phosphate fertilizer by adopting a blast furnace method with phosphate ore flotation tailings as main raw materials. Background technique [0002] In recent years, the rapid development of high-concentration phosphorus and compound fertilizer industries at home and abroad has caused a sharp decline in the reserves of phosphorus-rich ores that can be directly used for wet-process phosphoric acid processing, and the resources of phosphorus-rich ores in many areas are almost exhausted. In order to ensure the sustainable development of the high-concentration phosphorus compound fertilizer industry, many countries are using medium and low-grade phosphate rock or high-magnesium phosphate rock as raw materials to produce phosphate concentrate suitable for wet-process phosphoric acid processing. In the pro...

Claims

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Application Information

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IPC IPC(8): C05B5/00
Inventor 赵建国
Owner YUNNAN CHEM RES INST
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