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Method for preparing high-quality calcium superphosphate in producing process of feed-grade calcium hydrogen phosphate

A technology of calcium hydrogen phosphate and calcium superphosphate, applied in chemical instruments and methods, phosphorus compounds, peroxides/peroxyhydrates/peroxyacids/superoxides/ozonides, etc., can solve the problem of feed-grade phosphoric acid The economic benefits of calcium hydrogen phosphate enterprises, the backlog of fertilizer grade calcium hydrogen phosphate, and the inability to sell fertilizer grade calcium hydrogen phosphate, etc., to achieve economic benefits, low transportation costs, and maximize the effect

Active Publication Date: 2015-06-03
KUNMING CHUAN JINNUO CHEM IND
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  • Description
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AI Technical Summary

Problems solved by technology

The current sluggish fertilizer market has led to the inability to sell fertilizer grade calcium hydrogen phosphate of many feed grade calcium hydrogen phosphate enterprises, forming a large backlog of fertilizer grade calcium hydrogen phosphate, and seriously affecting the economic benefits of feed grade calcium hydrogen phosphate enterprises. Dibasic calcium phosphate enterprises have already dealt with the state of shutdown or semi-stop production

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  • Method for preparing high-quality calcium superphosphate in producing process of feed-grade calcium hydrogen phosphate

Examples

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Effect test

Embodiment example 1

[0033] 1) Using 23.5% phosphate rock as raw material, 8.3% wet-process phosphoric acid is prepared after reverse flotation and impurity removal. According to the technology of the present invention, one stage of heavy calcium carbonate is neutralized to pH 1.7, and then a second stage is performed. The hypolime is neutralized to a pH of 2.2 to prepare a high-phosphorus element powder containing 34.6% of available phosphorus.

[0034] 2) Add 15 parts of 98% sulfuric acid for every 100 parts of high-phosphorus element powder to prepare a highly water-soluble phosphate fertilizer containing 30.9% of available phosphorus and 18.8% of water-soluble phosphorus.

[0035] 3), 100 parts of the high water-soluble phosphate fertilizer prepared in the previous step is added 100 parts of ordinary calcium containing 12% effective, and then 120 parts of phosphogypsum, the prepared ordinary calcium has an effective phosphorus content of 14.6% and water-soluble phosphorus 10.3% , Free acid content ...

Embodiment example 2

[0037] 1). Using 24.5% phosphate rock as raw material, 10.2% wet-process phosphoric acid is prepared after reverse flotation and impurity removal. According to the technology of the present invention, the pH value of heavy calcium carbonate is increased to pH 1.8 in one stage, and then a second stage is performed. Hypolime is neutralized to pH 2.3 to prepare high-phosphorus element powder with 35.8% available phosphorus.

[0038] 2) Add 17 parts of 98% sulfuric acid for every 100 parts of high-phosphorus element powder to prepare a highly water-soluble phosphate fertilizer containing 31.1% of available phosphorus and 18.5% of water-soluble phosphorus.

[0039] 3) Add 100 parts of the high water-soluble phosphate fertilizer prepared in the previous step with 100 parts of general calcium containing 12.4% effective, and then add 59 parts of phosphogypsum, the prepared general calcium has an effective phosphorus content of 16.6% and water-soluble phosphorus 11.3% , Free acid content is...

Embodiment example 3

[0041] 1) Using 25.2% phosphate rock as raw material, after reverse flotation to remove impurities, 12.1% wet-process phosphoric acid is prepared. According to the technology of the present invention, the pH value of heavy calcium carbonate is 1.9 in one stage, and then the second stage is performed. Hypolime is neutralized to pH 2.5 to prepare high phosphorus element powder with 36.8% available phosphorus.

[0042] 2) Add 19 parts of 98% sulfuric acid for every 100 parts of high phosphorus element powder to prepare high water-soluble phosphate fertilizer with 30.9% available phosphorus and 17.3% water-soluble phosphorus.

[0043] 3). To 100 parts of the high water-soluble phosphate fertilizer prepared in the previous step, add 100 parts of ordinary calcium containing effective 12.4%, and then add 59 parts of phosphogypsum, the prepared ordinary calcium has an effective phosphorus content of 18.3% and water-soluble phosphorus 13.3% , Free acid content is 4.9%, sulfur content is 8.7...

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Abstract

The invention discloses a method for preparing high-quality calcium superphosphate in the process of producing feed-grade calcium hydrophosphate. The method comprises the following process steps: by taking medium / low grade phosphorite and sulfuric acid containing 21-25% of phosphorus pentoxide as a raw material, floating to remove magnesium oxide, preparing phosphorus concentrate with the grade of 28-33%, further preparing wet-method phosphoric acid containing 8-12% of phosphorus pentoxide by using an ordinary two-water method wet method phosphoric acid process, and the like. According to the method disclosed by the invention, by improving a part of process conditions of the feed-grade calcium hydrophosphate, high-quality fertilizer-grade calcium hydrophosphate can be prepared, and both the difficulties in treating and selling ordinary low-quality fertilizer-grade calcium hydrophosphate are solved, and high-quality calcium superphosphate is prepared.

Description

Technical field [0001] The invention relates to a method for preparing high-quality superphosphate by converting by-product high-phosphorus powder and part of sulfuric acid in the process of producing feed-grade calcium hydrogen phosphate by using middle and low-grade phosphate rock. It belongs to the technical field of phosphate fertilizer manufacturing methods. Background technique [0002] Superphosphate, also known as ordinary calcium phosphate, or ordinary calcium for short, is a phosphate fertilizer obtained directly by decomposing phosphate rock with sulfuric acid. The main useful component is calcium dihydrogen phosphate hydrate Ca(H 2 PO 4 ) 2 ·H 2 O and a small amount of free phosphoric acid, also contains anhydrous calcium sulfate component (useful for sulfur-deficient soil). Superphosphate contains effective P 2 O 5 It is 12% to 18% (of which 60 to 70% is soluble in water), which is a water-soluble quick-acting phosphate fertilizer. Gray or off-white powder (or gran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C01B15/16
Inventor 曾润国魏家贵刘泽祥刘甍冯发均周永祥韦文相
Owner KUNMING CHUAN JINNUO CHEM IND
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