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Method for directly preparing phosphor magnesium fertilizer with by-product mine tailing of phosphorus ore floatation

A technology for flotation of tailings and phosphate rock is applied in the field of preparing industrial-grade phosphorus-magnesium fertilizers, which can solve the problems of occupying a large amount of land resources, ecological environment, inputting large processing costs, changes, etc., and achieving good social and economic benefits.

Active Publication Date: 2009-02-18
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, the production process of phosphate rock flotation plants at home and abroad has adopted the method of natural dam building and stockpiling. For a phosphate rock flotation plant with an annual output of 2 million tons, the tailings discharged each year There are 500,000 tons of mines, and the tailings slurry converted into 50% is 1 million tons, which will take up a lot of land resources and cause changes in the ecological environment, and at the same time invest a lot of processing costs

Method used

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  • Method for directly preparing phosphor magnesium fertilizer with by-product mine tailing of phosphorus ore floatation
  • Method for directly preparing phosphor magnesium fertilizer with by-product mine tailing of phosphorus ore floatation
  • Method for directly preparing phosphor magnesium fertilizer with by-product mine tailing of phosphorus ore floatation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The typical chemical composition of the phosphate rock flotation tailings used is:

[0024]

[0025] Continuous production, the process such as figure 1 , including phosphate ore flotation tailings pretreatment, mixing, aging, crushing, granulation, and drying processes.

[0026] (1) Pretreatment

[0027] The purpose of pretreatment is to concentrate the phosphate ore flotation tailings slurry through a thickener, control the tailings moisture at about 40%-45%, and provide tailings raw materials with a water content of about 40%-45% for the production of phosphorus and magnesium fertilizers.

[0028] (2) mixed into

[0029] As a mixed chemical process for the production of phosphorus and magnesium fertilizers, the weight ratio of W phosphate ore flotation tailings: W concentrated sulfuric acid: W concentrated phosphoric acid is 3.34: 2.00: 1.00 and added to the mixer, and the stirring speed is controlled at 400r / min. The time is controlled at 45 minutes to make it...

Embodiment 2

[0037] The typical chemical composition of the phosphate rock flotation tailings used is:

[0038]

[0039] Continuous production, the process such as figure 1 , including pretreatment, mixing, aging and neutralization, granulation and drying.

[0040] The process steps used in this example are all the same as in Example 1.

[0041] Typical process conditions for this example are:

[0042]

[0043] The economic indicators of the industrial grade phosphorus and magnesium fertilizer prepared by this example are as follows:

[0044]

Embodiment 3

[0046] The typical chemical composition of the flotation phosphorous tailings used is:

[0047]

[0048] Continuous production, the process such as figure 1 , including pretreatment, mixing, aging and neutralization, granulation and drying.

[0049] The process steps used in this example are all the same as in Example 1.

[0050] Typical process conditions for this example are:

[0051]

[0052] The economic indicators of the industrial grade phosphorus and magnesium fertilizer prepared by this example are as follows:

[0053]

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Abstract

The invention relates to a preparation method of magnesium phosphate fertilizer, in particular to a method which takes phosphate flotation byproduct tailings in medium low-grade as raw materials to prepare industrial-grade magnesium phosphate fertilizer, and belongs to the field of chemical technology. The preparation method is characterized in that the preparation method comprises the following steps: first: taking flotation phosphate tailing slurry as the raw material, controlling the liquid water content to be between 40 percent and 45 percent; second: leading the tailing slurry in step (1) to a mixed reactor, starting a mixer, and controlling the rotate speed to be 400 r / min to 500 r / min; third: adding parathion mixed acid with a certain molar ratio into the reaction in the mixed reactor in step (2), carrying out chemical reaction when the mixed reactor warms up to a certain temperature, reaches a certain mixed reaction time and goes into a chemical chamber; fourth: delivering fresh magnesium phosphate fertilizer obtained from step (3) into a ripening warehouse for ripening; fifth: smashing the magnesium phosphate fertilizer obtained from step (4) to be directly packed to obtain power-shaped magnesium phosphate fertilizer products; sixth: smashing and delivering the magnesium phosphate fertilizer obtained from step (4) to a back pelletizer for pelleting to make grain-shaped magnesium phosphate fertilizer products.

Description

technical field [0001] The invention relates to a preparation method of phosphorus and magnesium fertilizer, in particular to a method for preparing industrial grade phosphorus and magnesium fertilizer by using tailings by-product of flotation of middle and low grade phosphorus ore as raw materials. It belongs to the field of chemical technology. Background technique [0002] After long-term mining, the world's phosphate rock resources have gradually become depleted, and high-grade phosphate rock has decreased significantly. As a non-renewable resource, phosphate rock resources are the basis of a country's food safety production. In recent years, the United States, Russia, China, India and other countries have launched a circular economy of phosphorus resources based on the use of phosphate rock to produce phosphate fertilizers and phosphorus chemical products. Research. Medium and low-grade phosphate rock is an important part of the research on the circular economy of pho...

Claims

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Application Information

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IPC IPC(8): C05B17/00
Inventor 曾波吴礼定
Owner YUNNAN CHEM RES INST
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