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Co-production method and system of ammonium phosphate and magnesium hydrate

A technology of magnesium hydroxide and ammonium phosphate, applied in the directions of magnesium hydroxide, phosphorus oxyacid, phosphate, etc., can solve the problems of high energy consumption and large phosphorus loss, achieve economical rationality, small phosphorus loss, and reduce production costs Effect

Active Publication Date: 2015-03-25
HUBEI XIANGYUN GROUP CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal method is the calcination digestion method, which is to calcinate 25-30mm phosphate rock at a high temperature of about 850°C to decompose the carbonate, and then digest it with water to convert CaO and MgO into solution and fine particle suspension Ca(OH) 2 and Mg(OH) 2 However, it flows away with the digested water to separate from the phosphorus minerals. This method consumes a lot of energy; the phosphorus loss caused by the crushing of phosphate rocks is very large.

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  • Co-production method and system of ammonium phosphate and magnesium hydrate
  • Co-production method and system of ammonium phosphate and magnesium hydrate
  • Co-production method and system of ammonium phosphate and magnesium hydrate

Examples

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Embodiment 1

[0040] see figure 1 and 2 , the embodiment of the present invention provides a method for the co-production of ammonium phosphate and magnesium hydroxide, the method comprising the following steps:

[0041] (1) Demagnesization by flotation: Make magnesium-containing phosphate rock pulp (raw ore pulp as shown in Table 1) into a slurry with a mass concentration of 35% water, raise the temperature to 60°C, and add magnesium removal agent ( The concentration of the demagnesizing agent is 12%, the molar ratio of MgO (dry basis) to the demagnesizing agent in the slurry is 1:2.3), the reaction time is 2 hours, the pH of the final slurry is controlled to be about 4.7, and the solid-liquid Separation, the liquid phase is magnesium removal wastewater, and the solid phase is concentrate pulp (the content of magnesium and phosphorus after washing is shown in Table 1 and Table 2).

[0042] Table 1

[0043]

[0044] Table 2

[0045]

[0046] ...

Embodiment 2

[0059] Example 2 On the basis of Example 1, the concentration of the magnesium removal agent, the continuous operation time of the magnesium removal reaction, the secondary precipitation reaction time and the pH parameters of the secondary precipitation reaction are discussed, so as to maximize the effect of magnesium removal And reduce phosphorus loss, and obtain magnesium hydroxide product with high yield and purity.

[0060] (1) Influence of the concentration of demagnesizing agent

[0061] In phosphate rock (P 2 o 5 is 29.1%, MgO is 2.04%), the molar ratio of MgO demagnesizing agent is 1:2.3, the pulp concentration (containing H 2 O) Under certain conditions, the reaction time is 2h, and the reaction temperature is 50°C, the concentration of magnesium removal agent and the amount of magnesium removal agent are changed. The experimental results are shown in Table 3:

[0062] table 3

[0063]

[0064] (2) The influence of the continuous operation time of the magnesium...

Embodiment 3

[0085] see figure 1 and 2 , the embodiment of the present invention provides a co-production system of ammonium phosphate and magnesium hydroxide, the system includes a pulp production system 3, an acid method demagnesization system 1, a phosphoric acid production device 401, an ammonium phosphate production device (including an industrial ammonium phosphate production device 401 and / or industrial ammonium phosphate production unit 402), liquid ammonia storage tank 404 and magnesium hydroxide production unit 2, etc. Among them, the pulp production system 3 is connected with the acid method magnesium removal system 1 through pipelines, the concentrate pulp output end of the acid method magnesium removal system 1 is connected with the phosphoric acid production device 401 through pipelines, and the magnesium removal wastewater of the acid method magnesium removal system 1 The output end is connected with the magnesium hydroxide production device 2 through pipelines. At the sam...

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Abstract

The invention discloses a co-production method and system of ammonium phosphate and magnesium hydrate, belonging to the technical field of fertilizer production. The method comprises the following steps: raising the temperature of phosphoric ore pulp containing magnesium to 40-60 DEG C, adding a de-magging agent, reacting for 2-3 hours, controlling the pH value of slurry at the finished point at 4.5-5.0, and carrying out solid liquid separation, wherein the solid phase is used for producing phosphoric acid while the liquid phase is recycled to be used as a de-magging agent and / or enters into a magnesium hydrate production device; and feeding the obtained liquid phase isolate into the magnesium hydrate production device, carrying out reaction with ammonia for primary sedimentation, reacting for 20-40 minutes by controlling the pH at 8.5-9.5, and carrying out solid liquid separation, wherein a primary filter cake enters into an ammonium phosphate production device while a primary filtrate cake is reacted with ammonia for secondary sedimentation, the reaction temperature is 35-50 DEG C, the reaction pH is 9.5-10.5 and the reaction time is 2-3.5 hours; and carrying out solid liquid separation, wherein a secondary filter cake is used for magnesium hydrate and a secondary filtrate is used for a defibrinating process of the phosphoric ore pulp containing magnesium or / and washing and de-magging to obtain a solid phase isolate.

Description

technical field [0001] The invention belongs to the technical field of fertilizer production, and particularly relates to a method and system for the co-production of ammonium phosphate and magnesium hydroxide, in particular to a method and system for the co-production of ammonium phosphate and magnesium hydroxide by using an acid method. Background technique [0002] Phosphorus is an essential element for crops. With the development of science and technology, the use of phosphorus is also expanding. Phosphate rock resources are important basic raw materials for the development of phosphorus chemical industry. The main mineral components of phosphorite rock are collophosite and microcrystalline apatite, and the secondary minerals are quartz, dolomite, calcite, feldspar clasts, and carbon argillaceous matter. And a small amount of sea green stone and so on. Phosphate rock is mainly used to make phosphoric acid, which plays a great role in the development of the national eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C01F5/20
Inventor 周玉新丁一刚何俊余莹居丽孔小燕查炎华胡玉峰
Owner HUBEI XIANGYUN GROUP CHEM
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