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Method for producing potassium sulphate fertilizer by using phosphogypsum

A technology of phosphogypsum and sulfuric acid, which is applied in potash fertilizers, applications, inorganic fertilizers, etc., can solve the problems of difficult phosphoric acid treatment, difficult industrial scale-up, complex process, etc., and achieve the effect of being suitable for industrial production, easy to obtain, and solving industrial waste residues

Active Publication Date: 2011-10-05
GUANGDONG DAZHONG AGRI SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

When this method is adopted, the utilization rate of phosphogypsum can reach 65% to 70%, and the product can be used as a high-quality potassium sulfate fertilizer; Phosphoric acid is difficult to handle, and it is difficult to operate under pressure or low temperature, and it is difficult to scale up industrially.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for producing potassium sulfate fertilizer using phosphogypsum; the method is to fully mix 20% by weight of phosphogypsum and 80% of potash layer stone powder and then calcinate, the calcining temperature is 1800°C, and the calcining time is 2 minutes.

Embodiment 2

[0029] A method for using phosphogypsum to produce potassium sulfate fertilizer; the method is to fully mix 30% by weight of phosphogypsum and 70% of potash layer stone powder and then calcinate, the calcining temperature is 1500°C, and the calcining time is 30 minutes.

Embodiment 3

[0031] A method for using phosphogypsum to produce potassium sulfate fertilizer; the method is to fully mix 40% by weight of phosphogypsum and 60% of potash layer stone powder and then calcinate, the calcining temperature is 1200 DEG C, and the calcining time is 40 minutes.

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Abstract

The invention relates to the technical field of fertilizer production methods, in particular to a method for producing potassium sulphate fertilizer by using phosphogypsum. The method comprises the following steps: fully mixing 20 to 80 percent of the phosphogypsum and 20 to 80 percent of potassium feldspar powder in percentage by weight, and calcining the mixture, wherein the calcination temperature is 800 to 1,800 DEG C, and the calcination time is 2 to 120 minutes. The method has easily-obtained raw materials and low cost; and the whole process flow is smooth, simple, easy and is quite suitable for industrialized production.

Description

Technical field: [0001] The invention relates to the technical field of fertilizer production methods, in particular to a method for producing potassium sulfate fertilizer by using phosphogypsum. Background technique: [0002] Phosphogypsum is a solid waste of the phosphate fertilizer industry, and phosphoric acid is the foundation of the phosphate fertilizer industry. The wet-process phosphoric acid production process is to distribute phosphate rock powder through sulfuric acid to produce extraction slurry, and then filter and wash to obtain phosphoric acid. During the process of filtering and washing, phosphogypsum waste is produced. Generally, about 5-6 tons of phosphogypsum are produced for every ton of phosphoric acid produced, and 2.5-5 tons of phosphogypsum are emitted for every ton of diammonium phosphate produced. The production of wet-process phosphoric acid in my country is about 1 million tons. With the rapid development of the high-concentration compound fertilizer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05D1/02
Inventor 林小明
Owner GUANGDONG DAZHONG AGRI SCI CO LTD
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