Method for preparing calcium magnesium phosphate fertilizer by using phosphorite floatation tailing as raw material

A technology of calcium magnesium phosphate fertilizer and cyclone furnace, which is applied in the direction of phosphate fertilizer, Thomas phosphate fertilizer, fertilization equipment, etc., can solve the problems of hidden safety hazards, occupation of land resources, environmental pollution, etc., and achieve economic feasibility, save phosphorus resources, and reduce production costs.

Active 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 using phosphorite floatation tailing as raw material
  • Method for preparing calcium magnesium phosphate fertilizer by using phosphorite floatation tailing as raw material
  • Method for preparing calcium magnesium phosphate fertilizer by using phosphorite floatation tailing as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention takes phosphate ore flotation tailings as main raw material, adopts cyclone furnace to prepare the production flow key points of calcium magnesium phosphate fertilizer as follows:

[0022] (1) Preparation of phosphate rock flotation tailings raw materials

[0023] Use flotation phosphorus tailings slurry as raw material, dehydrate through thickener and filter to obtain flotation tailings filter cake with a water content of 20-40%; dry the filter cake or the wet tailings stockpiled in the tailings pond Dehydration to obtain phosphorus tailings powder with water content 2 o 5 ) is 8 to 12%, and the fineness of the powder itself is more than 80% of the 100-mesh sieved particles. See the production process figure 1 .

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

[0025] Other primary phosphate rock W(P 2 o 5 ≥23%), coal, snakehead stone, silica crushing, metering and mixing, crushing into fineness of sieved 100 mesh pa...

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

30.60

6.10

[0039] chemical composition

P 2 o 5

MgO

CaO

SiO 2

Phosphate Rock Raw Materials

15.50

10.96

32.65

14.30

[0040] (2) The production process and operation steps of calcium magnesium phosphate fertilizer prepared by cyclone furnace

[0041] Production flow and operation control step are identical with embodiment 1, and process flow chart is as figure 1 , figure 2 .

[0042] (3) Typical process conditions of this example

[0043] Typical process conditions for this example

[0044] Melting temperature (℃)

...

Embodiment 3

[0049] (1) Chemical composition of flotation phosphorus tailings and phosphate rock raw materials

[0050] Typical chemical composition (mass %) of flotation phosphorus tailings and furnace phosphate rock raw materials used in this example

[0051] chemical composition

P 2 o 5

MgO

CaO

SiO 2

Flotation Tailings

10.08

11.65

31.68

9.62

Phosphate Rock Raw Materials

15.85

10.26

32.94

13.96

[0052] (2) The production process and operation steps of calcium magnesium phosphate fertilizer prepared by cyclone furnace

[0053] Production flow and operation control step are identical with embodiment 1, and process flow chart is as figure 1 , figure 2 .

[0054] (3) Typical process conditions of this example

[0055] Typical process conditions for this example

[0056] Melting temperature (℃)

1400

Melting time (min)

45

Quenching temperature (℃)

40

...

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Abstract

The invention relates to a method for preparing calcium magnesium phosphate fertilizer through cyclone furnace process by using phosphorite floatation tailings as raw materials, in particular to a method for preparing calcium magnesium phosphate fertilizer through adopting a cyclone furnace by using phosphorite floatation tailings as main raw materials, belonging to the technical field of phosphate fertilizer chemical industry. The method uses the phosphorite floatation tailings as the main raw materials and adopts the cyclone furnace to prepare calcium magnesium phosphate fertilizer, and comprises the following steps: (1) the phosphorite floatation tailings are used as the raw materials, pulp dry basis contains 8-12 percent of P2O5 by weight percent, tailing filter cakes are obtained through treatment and the tailing filter cakes contain 20-40 percent of water; (2) the tailing filter cakes obtained through the step (1) are dried to tailing power containing water less than 2 percent by using a dryer, and the required grain size of tailing powder is that more than 80 percent of particles can pass through a 100-mesh sieve; (3) other primary phosphorite, coal, serpentine stone and silica to be jointly calcined are metered, mixed, cracked and crushed into joint-calcination mixed powder with fineness that more than 80 percent of particles can pass through the 100-mesh sieve; (4) 100 parts of phosphorite raw material, 190-280 parts of pulverized coal, 0-10 parts of silica and 0-20 parts of serpentine stone powder are added in the cyclone furnace by weight; and (5) the calcined powder raw material obtained through the step (4) is used to prepare calcium magnesium phosphate fertilizer by adopting the cyclone furnace. The invention has the advantages that the source of the raw materials is wide and the cost is low; sulfuric acid and phosphoric acid are not consumed, the product quality is reliable, the use is economic and feasible, and the social benefit is remarkable.

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 using phosphate ore flotation tailings as main raw materials and using a cyclone furnace. 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 proces...

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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