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High-magnesium phosphorite de-magging method with by-product magnesium ammonium phosphate

A technology of by-product ammonium phosphate and high-magnesium phosphate rock, which is applied in the fields of phosphate material treatment, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of difficult promotion of chemical magnesium removal, large loss of phosphorus pentoxide, and low removal rate. Advanced problems, achieve the effect of improving foaming phenomenon and filtration performance, saving equipment investment and high removal rate

Inactive Publication Date: 2013-03-27
GUIZHOU KAILIN GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for magnesium ammonium phosphate removal by-product of high-magnesium phosphate rock, which solves the problem of large equipment investment, high energy consumption, poor working environment, low extraction rate, and five The loss of phosphorus oxide is large, the amount of sewage is large and difficult to treat, and the chemical removal of magnesium is difficult to popularize.

Method used

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  • High-magnesium phosphorite de-magging method with by-product magnesium ammonium phosphate

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Experimental program
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Effect test

Embodiment 1

[0029] Grind 1Kg of phosphate sand with MgO content of 4.2% to 100 mesh, mix it with 1.2kg of water to prepare a slurry, slowly add 93% sulfuric acid while stirring, adjust the pH value of the slurry to 3.5, and add it dropwise while stirring Sulfuric acid kept the pH value of the solution unchanged, reacted for 90 minutes, filtered and dried, and analyzed the content of MgO in the ore powder to be 0.42%; the filtered sewage was adjusted to PH value to 8.5 with 25% ammonia water, stirred for 50 minutes, filtered, and solid-phase dried 120g of magnesium ammonium phosphate fertilizer was obtained by dry weighing, and 140g of phosphoric acid with a phosphoric acid concentration of 64% was added to the filtrate, which was sent to the separated sewage obtained after magnesium removal and continued to stir for 60 minutes, and filtered to obtain 155g of magnesium ammonium phosphate.

Embodiment 2

[0031] Mix 0.8kg of ore powder with MgO content of 3.6%, particle size of 200 mesh, and 0.8kg of water to make a slurry, adjust the pH of the slurry to 3.2 with phosphoric acid with an acid concentration of 50%, continue to stir and react, and adopt the method of adding phosphoric acid to maintain The PH value of the ore slurry was kept unchanged for 80 minutes, filtered and dried, and the MgO content in the slag powder was analyzed to be 0.51%; liquid ammonia was slowly introduced into the filtered sewage to adjust the pH value of the solution to 8.0, stirred and reacted for 60 minutes, filtered, filtered The cake was dried and weighed to obtain 167g of magnesium ammonium phosphate.

Embodiment 3

[0033] Use 0.6Kg of ore powder with a particle size of 200 mesh and a MgO content of 3.7% to prepare a slurry with a water content of 40%, and adjust the pH value of the slurry to 3.3 with a mixed acid made of sulfuric acid and phosphoric acid with a mass fraction of 50% each. Add mixed acid to keep the pH of the solution constant. Stir and react the pulp for 80 minutes, filter and dry. After analysis, the content of MgO in the ore powder is 0.47%. Slowly inject gas ammonia into the filtered sewage to adjust the pH value of the solution to 9.0. Stir the reaction for 45 minutes, filter, dry and weigh the filter cake to obtain 134 g of magnesium ammonium phosphate.

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Abstract

The invention discloses a high-magnesium phosphorite de-magging method with a by-product magnesium ammonium phosphate. The method is as below: mixing a mineral powder and water to obtain a pulp; then adding a magnesium removal agent into the pulp for reaction; then separating wastewater and mineral powder after magnesium removal; adding ammonia into the wastewater to generate magnesium ammonium phosphate; filtering to obtain a magnesium ammonium phosphate product; and adding a recycled filtrate from filter into the pulp. The invention has advantages of economical equipment investment and good operating environment; sulfuric acid and / or phosphoric acid is used as a magnesium removal agent, has high removal rate of magnesium, significantly reduces magnesium content in the phosphate, and especially has obvious effect on phosphate with high magnesium content, so as to reduce loss of phosphorus pentoxide in the phosphate; the wastewater can be recycled to save water resource, and causes no impact on the environment; the treated concentrate in a wet production significantly improves bubble phenomenon and filtering performance, so as to improve production capacity and labor productivity of the whole device, and reduce the production cost; and magnesium in the phosphate can be used for production of a magnesium ammonium phosphate slow release fertilizer, and generates good economic benefit.

Description

technical field [0001] The invention relates to a method for demagnesizing high-magnesium phosphate rock to produce magnesium ammonium phosphate by-product. Background technique [0002] Phosphate rock is a non-renewable resource. With the development of industry and the in-depth processing of phosphorus products, there are fewer and fewer high-quality phosphate rocks. The proven reserves of phosphate resources in my country are about 16Gt, of which rich ore only accounts for about 8%. The primary phosphate rock is mostly low-grade collophosite that is difficult to select, with fine mineral particles, tightly embedded distribution, and high content of impurities such as magnesium. The impurity content in lean phosphate rock is high, especially the existence of magnesium oxide, which is not good for the production of wet-process phosphoric acid. At the same time, the quality of phosphoric acid product decreases, which makes it difficult for subsequent product processing. In...

Claims

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Application Information

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IPC IPC(8): C01B25/01C01B25/45
Inventor 朱飞武廖吉星彭宝林周勇王先炜潘礼富宋同彬张丽谢静韩朝应郑超
Owner GUIZHOU KAILIN GRP CO LTD
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