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Method for producing high-quality enriched superphosphate as byproduct in production of feed grade calcium hydrophosphate

A technology rich in calcium superphosphate and calcium hydrogen phosphate, applied in the direction of calcium superphosphate, chemical instruments and methods, phosphate fertilizer, etc., can solve the backlog of fertilizer grade calcium hydrogen phosphate, low price, and affect the economic benefits of feed grade calcium hydrogen phosphate enterprises, etc. problem, to achieve the effect of realizing economic benefits, maximizing, and good reactivity

Inactive Publication Date: 2015-02-18
KUNMING CHUAN JINNUO CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Due to the sluggish fertilizer market, many feed-grade calcium hydrogen phosphate enterprises have poor quality and low prices of fertilizer-grade calcium hydrogen phosphate, which cannot be sold, resulting in a large backlog of fertilizer-grade calcium hydrogen phosphate and seriously affecting feed-grade calcium hydrogen phosphate enterprises. Economic benefits, most feed grade calcium hydrogen phosphate enterprises have already dealt with the state of production suspension or semi-production suspension

Method used

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  • Method for producing high-quality enriched superphosphate as byproduct in production of feed grade calcium hydrophosphate

Examples

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Effect test

Embodiment example 1

[0037] 1. Using 23.3% phosphate rock as raw material, 9.1% wet-process phosphoric acid is prepared after flotation and selection of magnesium. According to the technology of the present invention, one stage of primary heavy calcium is neutralized to pH 1.6, and then a second stage of lime neutralization is performed. To pH 2.1, prepare high-phosphorus powder with 34.2% available phosphorus;

[0038] 2. Add 18.6 parts of phosphoric acid containing 42.5% phosphorus pentoxide and a mixed acid of sulfuric acid (concentrated phosphoric acid with 6% sulfuric acid) for every 100 parts of high phosphorus powder to prepare high phosphorus fertilizer containing 35.5% of available phosphorus;

[0039] 3. Add 74.5 parts of ordinary calcium containing 12.3% of available phosphorus to 100 parts of the high-phosphate fertilizer prepared in the previous step, and the prepared superphosphate-rich calcium has an effective phosphorus content of 25.6%, water-soluble phosphorus 16.6%, and a free acid co...

Embodiment example 2

[0041] 1. Using 23.9% phosphate rock as raw material, 10.2% wet-process phosphoric acid is prepared after flotation and selection of magnesium. According to the technology of the present invention, the pH value of the first heavy calcium is 1.7, and then the second lime is added. And to pH 2.3, prepare high phosphorus powder with 35.8% available phosphorus;

[0042] 2. For every 100 parts of high phosphorus powder, add 34.1 parts of a mixed acid of phosphoric acid and sulfuric acid containing 41.3% phosphorus pentoxide (9% sulfuric acid is added to concentrated phosphoric acid) to prepare high phosphorus fertilizer with 37.2% available phosphorus;

[0043] 3. Add 30.3 parts of ordinary calcium containing 12.3% effective to 100 parts of the high-phosphorus fertilizer prepared in the previous step, and the prepared superphosphate-rich calcium has an effective phosphorus content of 31.4%, water-soluble phosphorus 20.4%, and a free acid content of 6.6%. The product quality meets the te...

Embodiment example 3

[0045] 1. Using 24.6% phosphate rock as the raw material, the 11.5% wet-process phosphoric acid is prepared after flotation and selection of magnesium. According to the technology of the present invention, the pH value of the first heavy calcium is 1.9, and then the second lime is added. And to pH 2.4, prepare high phosphorus powder with 36.7% available phosphorus;

[0046] 2. For every 100 parts of high phosphorus powder, add 118.7 parts of a mixed acid of phosphoric acid and sulfuric acid containing 40.2% phosphorus pentoxide (12% sulfuric acid is added to concentrated phosphoric acid) to prepare high phosphorus fertilizer containing 38.6% of available phosphorus;

[0047] 3. Add 14.2 parts of ordinary calcium containing 12.1% of effective calcium to 100 parts of high-phosphorus fertilizer prepared in the previous step, and the prepared superphosphate-rich calcium has an effective phosphorus content of 35.3%, water-soluble phosphorus 22.5%, and a free acid content of 6.8%. The qu...

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Abstract

The invention relates to a method for producing high-quality enriched superphosphate as a byproduct in the production of feed grade calcium hydrophosphate. The method adopts the following technological processes: 1), using low and middle grade phosphate containing 21-25% of phosphorus pentoxide, ferric oxide, aluminum oxide and magnesium oxide as a raw materials, wherein the content of the ferric oxide, the aluminum oxide and the magnesium oxide is more than 3.5%; preparing high grade phosphate concentrate after flotation, wherein the content of phosphorus pentoxide is 28-33% and the total content of impurities of oxides of iron, magnesium and aluminum is less than 3.5%; using sulfuric acid and the high grade phosphate concentrate with impurities of iron, magnesium and aluminum removed through floatation as raw materials, preparing a wet-process phosphoric acid containing 8-12% of phosphorus pentoxide through a common dihydrate wet phosphoric acid process method, and the like. Through the adoption of the method, the high phosphorus powder as the byproduct can be produced in the process of purification of the wet-process phosphoric acid, further the high-quality enriched superphosphate is prepared, the production cost is greatly reduced, and the economic benefit is improved.

Description

Technical field [0001] The present invention relates to the use of medium and low-grade phosphate ore to obtain high-grade phosphate concentrate through a flotation process, and part of the high-grade phosphate element fertilizer obtained during the process of producing feed-grade calcium hydrogen phosphate from the high-grade phosphate concentrate is used as raw material. The method of adding a small amount of mixed acid of phosphoric acid and sulfuric acid to prepare high-quality superphosphate-rich superphosphate belongs to the field of phosphate fertilizer product manufacturing. Background technique [0002] Superphosphate-rich is made by using sulfuric acid, phosphoric acid or waste acid in a certain proportion to prepare a certain concentration of mixed acid to decompose phosphate rock. The product component is mainly calcium dihydrogen phosphate hydrate Ca(H 2 PO 4 ) 2 ·H 2 O and a small amount of free phosphoric acid, anhydrous calcium sulfate and iron aluminum phosphate a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C05B1/04
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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