Method for demagging ground phosphorite and preparing MgHPO4.3H2O

A technology of mghpo4·3h2o, phosphate rock powder, applied in the direction of improving process efficiency, can solve the problems of high consumption, no demagnesization of phosphate rock, etc., to prevent phosphorus loss, inhibit the generation of phosphoric acid, and promote crystal forming. Effect

Active Publication Date: 2013-10-23
ANHUI LIUGUO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, it can be seen that phosphorus loss cannot be avoided during the demagnesization treatment of phosphate rock in the prior art; the waste liquid after treatment is alkaline, and a large amount of acidic demagnesizing agent must be consumed if it is reused
So far, there has been no report on the simultaneous use of magnesium removal activators and magnesium removal accelerators to remove magnesium from phosphate rocks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Take 0.25 volume of phosphoric acid with a mass percentage concentration of 85%, and 0.02 volume of 36%~38% hydrochloric acid, and slowly add them to 1 volume of water, and prepare a dilute compound demagnesizing agent solution for use;

[0039] (2) After the ore grinding and washing section, take the P-containing 2 o 5 The mass fraction is 29.1%, the MgO mass fraction is 3.6%, and the particle size is 100 mass parts of Yichang phosphate rock powder of 70% crossing 100 mesh sieves, placed in the reactor; Add 0.2 mass parts of sodium dodecylbenzenesulfonate, Add 0.5 parts by mass of sodium polyphosphate, add 300 parts by mass of water to make a slurry; then enter the phosphate rock demagnesization section: control the temperature at 60°C, stir at 500r / min, and slowly add the previously prepared slurry at a rate of 0.2 to 1ml / min The compound demagnesizing agent dilute solution, adjust the pH of the control system in the range of 2~4, react for 50min, and demagnesizi...

Embodiment 2

[0045] (1) Take 0.15 volume of phosphoric acid with a mass percentage concentration of 45%, 0.01 volume of 36%~38% hydrochloric acid, and 0.01 volume of 65%~68% nitric acid, and slowly add them to 1 volume of water to prepare a compound magnesium removal agent dilute The solution is ready for use;

[0046] (2) Take P 2 o 5 The mass fraction is 28.3%, the MgO mass fraction is 2.8%, and the particle size is 100 mass parts of Pearl Phosphate Rock Powder 60% through a 100 mesh sieve, placed in the reactor, adding 0.01 mass part of cetyl ammonium bromide, carbonic Add 0.1 parts by mass of sodium and 400 parts by mass of water to form a slurry, control the temperature at 70°C, and slowly add the demagnesing agent at a rate of 0.2~0.5ml / min at a stirring rate of 450r / min, and control the pH at 2~ 4 Reaction for 30 minutes, magnesium removal is complete;

[0047] (3) The solid-liquid mixture after the demagnesization reaction in step (2) is vacuum filtered for more than 2 minutes u...

Embodiment 3

[0052] (1) Take 0.25 volume of phosphoric acid with a mass percentage concentration of 20%, and 0.025 volume of 98% sulfuric acid, and slowly add them to 1 volume of water, and prepare a dilute compound demagnesizing agent solution for use;

[0053] (2) Take P 2 o 5 The mass fraction is 24.3%, the MgO mass fraction is 6.7%, and the particle size is 100 mass parts of Baokang phosphate rock powder with 60% crossing 100 mesh sieves, placed in the reactor, and 0.2 mass parts of cetyl ammonium bromide is added, 0.1 part by mass of polysorbate, 0.3 part by mass of sodium polyphosphate, 0.1 part by mass of sodium chloride, and 250 parts by mass of water were added to form a slurry. The temperature was controlled at 60°C. Slowly add the magnesium removal agent at a rate of 1 / min, control the pH at 2~4 and react for 90 minutes, and the magnesium removal is completed;

[0054] (3) Centrifuge the solid-liquid mixture after the magnesium removal reaction in step (2) at a speed above 200...

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PUM

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Abstract

The invention discloses a method for demagging ground phosphorite and preparing MgHPO4.3H2O. The invention is characterized in that ground phosphorite is subjected to demagging pretreatment by using a composite demagging agent mainly comprising phosphoric acid as well as a demagging activating agent and a demagging stabilizer, thereby removing magnesium impurities from the ground phosphorite and enhancing the grade of the ground phosphorite; after demagging, the solid phase obtained by liquid-solid separation is the high-grade concentrate powder which can be used as a production raw material for phosphorus chemical industry; and a chemical coprecipitation-oriented crystallization process is utilized to recycle magnesium in the demagging waste liquor, thereby preparing the MgHPO4.3H2O product. After the original medium / low-grade ground phosphorite is treated by the method disclosed by the invention, the mass percent of P2O5 is enhanced by 0.1-5%, the total mass content of P2O5 is increased by 0.1-3%, the condition of severe phosphorus loss in the existing pretreatment method is changed, the removal rate of the magnesium oxide mass content is up to 75-98%, and the purity of the prepared MgHPO4.3H2O is up to 90-98%.

Description

technical field [0001] The invention belongs to the technical field of phosphate rock powder purification, and specifically relates to the use of a composite demagnesizing agent whose main component is phosphoric acid, a demagnesizing accelerator and a demagnesizing stabilizer to reduce magnesium impurities in phosphate rocks and improve the grade of phosphate rocks, and to use chemical co-precipitation- —Recovering magnesium in demagnesization waste liquid by directional crystallization method to prepare MgHPO 4 ·3H 2 O's method. technical background [0002] At present, the world's phosphate rock resources are becoming increasingly depleted. How to use low-grade phosphate rock to produce phosphoric acid and phosphate has attracted great attention from phosphate rock workers. About 90% of China's phosphate rock resources are of medium and low grade, and most of them are marine sedimentary rocks, which are difficult to use directly. Moreover, due to the presence of magnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B26/22
CPCY02P10/20
Inventor 崔鹏陈宇金梦圆王琪沈浩刘荣彭克荣许昕
Owner ANHUI LIUGUO CHEM CO LTD
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