Method for obtaining high-quality superphosphate-enriched byproduct in feed-grade calcium hydrophosphate production process

A technology rich in superphosphate and calcium hydrogen phosphate, applied in the direction of superphosphate, chemical instruments and methods, phosphate fertilizers, etc., can solve the problems affecting the economic benefits of feed-grade calcium hydrogen phosphate enterprises, poor quality of fertilizer-grade calcium Problems such as calcium hydrogen phosphate backlog, to achieve the effect of economic benefits, maximization, and low transportation costs

Active Publication Date: 2015-05-27
KUNMING CHUAN JINNUO CHEM IND
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  • Abstract
  • Description
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AI Technical Summary

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

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  • Method for obtaining high-quality superphosphate-enriched byproduct in feed-grade calcium hydrophosphate production process

Examples

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Comparison scheme
Effect test

Embodiment example 1

[0037]1. Using phosphate rock with a grade of 23.3% as raw material, 9.1% wet-process phosphoric acid is produced after reverse flotation to remove magnesium. According to the technology of the present invention, one section of primary calcium carbonate is neutralized to pH 1.6, and then one section of two Hypolime is neutralized to a pH value of 2.1 to produce phosphorus element powder containing 34.2% available phosphorus.

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

[0039] 3. Add 74.5 parts of general calcium containing 12.3% of available phosphorus to 100 parts of the phosphorus element fertilizer prepared in the previous step, and the prepared superphosphate-enriched calcium has 25.6% of available phosphorus, 16.6% of w...

Embodiment example 2

[0041] 1. Using phosphate rock with a grade of 23.9% as raw material, 10.2% wet-process phosphoric acid is produced after reverse flotation to remove magnesium. According to the technology of the present invention, the first heavy calcium is neutralized to a pH value of 1.7, and then the second lime is carried out. Neutralize to a pH value of 2.3 to prepare phosphorus element powder containing 35.8% available phosphorus.

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

[0043] 3. Add 30.3 parts of ordinary calcium containing effective 12.3% to 100 parts of the phosphorus element fertilizer prepared in the previous step, and the prepared superphosphate-enriched has an effective phosphorus content of 31.4%, a water-soluble phosphor...

Embodiment example 3

[0045] 1. Using phosphate rock with a grade of 24.6% as raw material, 11.5% wet-process phosphoric acid is produced after reverse flotation to remove magnesium. According to the technology of the present invention, the first heavy calcium is neutralized to a pH value of 1.9, and then the second lime is carried out. Neutralize to a pH value of 2.4 to prepare phosphorus element powder containing 36.7% of available phosphorus.

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

[0047] 3. Add 14.2 parts of common calcium superphosphate containing effective 12.1% to 100 parts of the phosphorus element fertilizer prepared in the previous step, and the prepared superphosphate-enriched has an effective phosphorus content of 35.3%, a w...

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Abstract

The invention discloses a method for obtaining high-quality superphosphate-enriched byproduct in a feed-grade calcium hydrophosphate production process. The method disclosed by the invention is characterized by comprising the following process steps: (1) performing flotation on raw materials including medium and low-grade phosphorus ore in which the content of phosphorus pentoxide is 21-25 percent and the total content of ferric oxide, aluminum oxide and magnesium oxide is over 3.5 percent and preparing high-grade phosphate concentrate in which the content of phosphorus pentoxide is 28-33 percent and the total amount of iron, magnesium and aluminum oxide impurities is less than 3.5 percent; and (2) taking the high-grade phosphate concentrate in which the iron, magnesium and aluminum impurities are removed by virtue of reverse flotation and sulfuric acid as raw materials, preparing wet-process phosphoric acid containing 8-12 percent of phosphorus pentoxide according to a conventional dihydrate process wet-process phosphoric acid method. According to the technology in the invention, the aim of producing the high-quality superphosphate-enriched product by virtue of the medium and low-grade phosphorus ore can be achieved, the economical benefits of the feed-grade calcium hydrophosphate can be maximized, and the method has high popularization and application values in the existing feed-grade calcium hydrophosphate industry.

Description

technical field [0001] The present invention relates to the production of high-grade phosphorous concentrate by flotation process with medium and low-grade phosphorous rock, and part of the high-phosphorus element powder prepared in the process of producing feed-grade calcium hydrogen phosphate with high-grade phosphorous concentrate as raw material, and then The invention relates to a method for preparing high-quality superphosphate-rich calcium superphosphate by adding mixed acid of a small amount of phosphoric acid and sulfuric acid, which belongs to the field of phosphate fertilizer product manufacturing. Background technique [0002] Rich superphosphate is obtained by using sulfuric acid, phosphoric acid or concentrated phosphoric acid slag in a certain proportion to prepare a certain concentration of mixed acid to decompose phosphate rock. The main product component is calcium dihydrogen phosphate hydrate Ca(H 2 PO 4 ) 2 ·H 2 O and a small amount of free phosphoric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C05B1/02
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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