Method for recycling magnesium from middle-low grade high-magnesium phosphate rock

A high-magnesium phosphate rock, low-grade technology, applied in the field of magnesium recovery, can solve the problems of phosphorus loss, strong acidity of the compound demagnesizing agent, etc., and achieve the effects of small phosphorus loss, high efficiency, simple and reliable process

Inactive Publication Date: 2011-07-06
中化重庆涪陵化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN1924046A discloses a method for chemical magnesium removal, which uses a composite magnesium removal agent to separate magnesium from phosphate rock. The composite magnesium removal agent is concentrated sulfuric acid or concentrated sulfuric acid and sodium edetate or fluorosilicic acid Or a mixture of nitric acid, although such a composite demagnesizing agent can remove magnesium from phosphate rock, but due to the strong acidity of the composite demagnesizing agent, it is easy to cause phosphoric acid in the phosphate rock to react and cause phosphorus loss. The reaction mechanism as follows

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take medium and low-grade high-magnesium phosphate rock (P 2 o 5 content of 25.2%, MgO content of 3.14%, MgO / P 2 o 5 is 12.46%) and ground into phosphate rock powder, the fineness of which is 80% and passed through a 100-mesh sieve. Get 650 grams of ore powder in the reaction tank, add water 1625g and stir. The temperature of the water bath is raised to 60°C, and the magnesium removal agent (obtained by mixing 50 parts of 98% concentrated sulfuric acid and 50 parts of magnesium sulfate) is added to adjust the pH value to 3.5. Stop adding the magnesium removal agent. Keep the temperature at 60°C and stir for 2 hours to dissolve the magnesium in the phosphate rock under the action of acid.

[0034] (2) The demagnesization reaction slurry is separated from solid and liquid by means of forced vacuum filtration (centrifugal treatment can be used when the equivalent is large), and the filter cake is washed with an appropriate amount of water. The filter cake is magne...

Embodiment 2

[0041] (1) Take medium and low-grade high-magnesium phosphate rock (P 2 o 5 content of 25.2%, MgO content of 3.14%, MgO / P 2 o 5 is 12.46%) and ground into phosphate rock powder, the fineness of which is 80% and passed through a 100-mesh sieve. Take 600g of ore powder in the reaction tank, add 1800g of water to stir, take a water bath to 60°C, add magnesium hydrogen sulfate to adjust the pH value to 4.0, stop adding the magnesium hydrogen sulfate, add 220.6g of magnesium hydrogen sulfate, and keep the temperature of the water bath constant To 60 ℃, stirring reaction for 120min, so that the magnesium in the phosphate rock is dissolved under the action of acid.

[0042] (2) The solid-liquid separation of the magnesium removal reaction slurry is carried out by means of forced vacuum filtration, and the filter cake is washed with an appropriate amount of water. The filter cake is magnesium dephosphorylated concentrate, which can enter the production of wet-process phosphoric ac...

Embodiment 3

[0049] (1) Take medium and low-grade high-magnesium phosphate rock (P 2 o 5 content of 25.2%, MgO content of 3.14%, MgO / P 2 o 5 is 12.46%) and ground into phosphate rock powder, the fineness of which is 80% and passed through a 100-mesh sieve. .Put 650g of ore powder in the reaction tank, add 1300g of water and stir the water bath to 60°C, add magnesium removal agent (obtained by mixing 55 parts of 98% concentrated sulfuric acid and 45 parts of magnesium sulfate) and adjust the pH value to 3.0. Stop adding magnesium removal agent Add a total of 212.4g of demagnesizing agent, keep the temperature of the water bath to 50°C, stir and react for 120min, so that the magnesium in the phosphate rock is dissolved under the action of acid.

[0050] (2) The solid-liquid separation of the magnesium removal reaction slurry is carried out by means of forced vacuum filtration, and the filter cake is washed with an appropriate amount of water. The filter cake is magnesium dephosphorylated...

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Abstract

The invention discloses a method for recycling magnesium from middle-low grade high-magnesium phosphate rock, which is used for pretreating phosphate rock serving as a raw material and recycling magnesium during wet phosphoric acid production. The method comprises the following steps of: removing magnesium from the middle-low grade high-magnesium phosphate rock with a magnesium removing agent by using a chemical method and dissolving most magnesium in the phosphate rock out of phosphate rock pulp; after a magnesium removing reaction is finished, performing solid-liquid separation on the formed pulp, wherein an obtained solid filter cake is magnesium-removed phosphate concentrate which can be put into the wet production of phosphoric acid; putting filtrate serving as magnesium-removed pulp into a next precipitation reaction procedure, adding an appropriate amount of neutralizing precipitant to adjust the pH value to 7.5-9.0 and undergoing a precipitation reaction; and performing solid-liquid separation after the reaction, and drying the solid precipitate which is ammonium magnesium phosphate with air stream to obtain a finished ammonium magnesium phosphate slow-release fertilizer. The obtained filtrate (containing ammonium sulfate) can be returned to wet phosphoric acid production.

Description

technical field [0001] The present invention relates to a method for recovering magnesium from medium and low-grade high-magnesium phosphate ore, in particular to a process of chemically removing and recovering phosphorus during the pretreatment process of medium-low-grade and high-magnesium phosphate ore used in wet-process phosphoric acid production Magnesium in ore, method for reducing magnesium content in wet-process phosphoric acid and its downstream products. Background technique [0002] The presence of magnesium will have a series of extremely adverse effects on the processing of phosphate rock, especially wet processing. Since the magnesium salt in phosphate rock will be completely dissolved in the phosphoric acid solution in the production of wet-process phosphoric acid, in the production of wet-process phosphoric acid, since all the magnesium enters the liquid phase, the H in phosphoric acid will + The concentration is greatly reduced, which affects the reaction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B3/46C22B26/22
CPCY02P10/20
Inventor 盛勇刘小春胡曼川谭伟方定伟黄磊陈明凤周佩
Owner 中化重庆涪陵化工有限公司
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