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Device and method for recycling phosphorus and magnesium from phosphorus ore magnesium removal liquid

A technology for removing magnesium and phosphate rock, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low purity of magnesium ammonium phosphate, reduced magnesium removal rate, and many impurities, and achieves short reaction time and reduced Consume, improve the effect of purity

Inactive Publication Date: 2017-03-22
GUIZHOU KAILIN GRP MINERAL FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not pretreat the magnesium removal solution, and directly adds a precipitant for precipitation. The prepared magnesium ammonium phosphate is not high in purity and has many impurities. Magnesium solution will cause a significant decrease in the rate of magnesium removal

Method used

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  • Device and method for recycling phosphorus and magnesium from phosphorus ore magnesium removal liquid
  • Device and method for recycling phosphorus and magnesium from phosphorus ore magnesium removal liquid
  • Device and method for recycling phosphorus and magnesium from phosphorus ore magnesium removal liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 Shown: A device for recovering phosphorus and magnesium from phosphate rock demagnesium solution, including demagnesium solution clarification tank, reaction liquid clarification tank, high-level reactor, low-level reactor, pH detection head, pH console, centrifuge, magnesium removal The liquid clarification tank is connected to the high-level reactor through the upper liquid pump and the connecting pipe of the magnesium removal liquid. The high-level reactor is built into the high-level reactor for stirring. The other side of the liquid clarification tank is connected to the purification liquid pump, and the pH detection heads are respectively set at the outlet of the high-level reactor and the low-level reactor and connected to the pH console.

[0031] The pH detection head and the pH console form a pH monitoring system, which controls the flow rate of the precipitant according to the feedback relationship between the detected real-time pH value and t...

Embodiment 2

[0041] A device for recovering phosphorus and magnesium from a phosphate rock demagnesizing solution is carried out according to the content described in Example 1.

[0042] A method for recovering phosphorus and magnesium from a phosphate ore demagnesium solution. In step 2), the pH value of the high-level reactor is controlled to be 5.5-6.0, the pH value of the low-level reactor is controlled to be 7.0-7.5, and the pH value of the high-level reactor is controlled. The reaction time is 10min, and the reaction time in the low-level reactor is 10min; in step 3), the clarification operation is after stirring for 2h, then standing for 10h, and the remaining conditions and operations are carried out according to the content of Example 1.

Embodiment 3

[0044] A device for recovering phosphorus and magnesium from a phosphate rock demagnesizing solution is carried out according to the content described in Example 1.

[0045] A method for recovering phosphorus and magnesium from a phosphate ore demagnesium solution. In step 2), the pH value of the high-level reactor is controlled to be 5.5-6.0, the pH value of the low-level reactor is controlled to be 7.0-7.5, and the pH value of the high-level reactor is controlled. The reaction time is 5min, and the reaction time in the low-level reactor is 7min; in step 3), the clarification operation is after stirring for 0h, then standing for 10h, and the remaining conditions and operations are carried out according to the content of Example 1.

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PUM

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Abstract

The invention discloses a device and a method for recycling phosphorus and magnesium from phosphorus ore magnesium removal liquid. The device comprises a magnesium removal liquid clarifying tank, a reaction liquid clarifying tank, a high-level reactor, a low-level reactor, a pH (Potential of Hydrogen) detection head, a pH control panel and a centrifugal machine, wherein the magnesium removal liquid clarifying tank is connected with the high-level reactor through a magnesium removal liquid feeding pump and a connecting pipeline; the high-level reactor is internally provided with a high-level reactor stirrer; one side of the reaction liquid clarifying tank is connected with the low-level reactor through a returning pump and a connecting pipeline; the other side of the reaction liquid clarifying tank is connected with a purified liquid pump; and the pH detection head is arranged at outlets of the high-level reactor and the low-level reactor and then is connected to the pH control panel. The method comprises the following steps: after introducing the magnesium removal liquid into the device, controlling reaction conditions of the high-level reactor and the low-level reactor; after carrying out solid-liquid separation and clarification operation, obtaining a magnesium ammonium phosphate hexahydrate product and purified liquid capable of being circularly utilized. Compared with the prior art, the reaction time is short, the purity of the magnesium ammonium phosphate hexahydrate product is improved and wastewater generated in a magnesium removal liquid treatment process can be circularly and repeatedly utilized.

Description

technical field [0001] The invention relates to the field of recovery of phosphate rock demagnesization liquid, in particular to a device and method for recovering phosphorus and magnesium from phosphate rock demagnesization liquid. Background technique [0002] Phosphorus and sulfur mixed acid leaching agent has good demagnesization effect and low phosphorus loss rate. After demagnesization treatment, the content of magnesium oxide in phosphate rock can be reduced to less than 2%, so as to meet the standard for acid processing. However, the mixed acid demagnesization process produces a large amount of acid waste liquid containing metal cations such as magnesium, calcium, iron, aluminum, phosphorus, sulfur, etc., and the composition is complex. If it is discharged directly without treatment, it will cause serious pollution to the environment. Iron ions will cause iron in the water body. Ionic heavy metal pollution, phosphorus will cause eutrophication of water body, acid was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
CPCC01B25/451C01P2006/80
Inventor 杨尚达孔丹艳张梅杨红杨阳
Owner GUIZHOU KAILIN GRP MINERAL FERTILIZER CO LTD
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