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A method for preparing nano-scale magnesium hydroxide by phosphate rock demagnesization waste liquid

A magnesium hydroxide, nano-scale technology, applied in the field of waste liquid treatment and reuse, can solve the problems of resource waste, low comprehensive utilization, environmental pollution, etc., and achieve the effects of reducing waste residue discharge, considerable economic value, and cost reduction.

Inactive Publication Date: 2018-07-17
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low comprehensive utilization of phosphate ore magnesium removal waste liquid, easy to cause resource waste and environmental pollution, and provide a method for preparing nano-scale magnesium hydroxide by treating phosphate rock magnesium removal waste liquid with ammonia gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The content of MgO in the magnesium removal waste liquid of a phosphate rock is 0.004g / mL, P 2 o 5 The content is 0.47mg / ml. Take 3L of the phosphate ore magnesium removal waste liquid and place it in a submerged circulating impingement flow reactor, control the temperature at 25°C, and slowly feed ammonia gas into the reactor to reach the final pH value of 9.0, stop feeding ammonia gas, and continue stirring 15 minutes. Vacuum filter the slurry generated by the neutralization reaction in the first step, and add ammonium phosphate fertilizer to the solid phase obtained from solid-liquid separation. The mother liquor is all transferred to a neutralization tank (i.e., a submerged circulating impingement flow reactor) and a dispersant polyethylene glycol is added, and the amount of the dispersant is 1% of the theoretical output of nano-magnesium hydroxide. Feed ammonia gas into the neutralization tank to carry out the magnesium precipitation reaction, control the reacti...

Embodiment 2

[0022] The content of MgO in the magnesium removal waste liquid of a phosphate rock is 0.006g / mL, P 2 o 5 The content is 0.70mg / ml. Take 3L of the phosphate ore magnesium removal waste liquid and place it in a submerged circulating impingement flow reactor, control the temperature at 30°C, and slowly feed ammonia gas to reach the final pH value of 9.2, stop feeding ammonia gas, and continue stirring for 15 minutes. The slurry generated by the neutralization reaction in the first step is subjected to solid-liquid separation, and all the mother liquor is transferred to the neutralization tank (that is, the submerged circulation impingement flow reactor) and the dispersant polyethylene glycol is added. The amount of the dispersant is nanometer hydroxide 2% of the theoretical yield of magnesium. Continue to feed ammonia gas into the neutralization tank to carry out the magnesium precipitation reaction, control the reaction temperature to 30°C, and the reaction time to 60 minutes...

Embodiment 3

[0024] The content of MgO in the magnesium removal waste liquid of a phosphate rock is 0.008g / mL, P 2 o 5 The content is 0.93mg / ml. Take 3L of the phosphate ore magnesium removal waste liquid and place it in a submerged circulating impingement flow reactor, control the temperature at 35°C, and slowly feed ammonia gas to reach the final pH value of 9.5, stop feeding ammonia gas, and continue stirring for 15 minutes. The slurry generated by the neutralization reaction in the first step is subjected to solid-liquid separation, and all the mother liquor is transferred to the neutralization tank (that is, the submerged circulation impingement flow reactor) and the dispersant polyethylene glycol is added. The amount of the dispersant is nanometer hydroxide 3% of the theoretical yield of magnesium. Continue to feed ammonia gas into the neutralization tank to carry out the magnesium precipitation reaction, control the reaction temperature to 35° C., and the reaction time to 45 minut...

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Abstract

The invention discloses a method for preparing nanometer magnesium hydroxide from phosphorus ore magnesium removal waste liquor. The method specifically includes subjecting ammonia gas and the phosphorus ore magnesium removal waste liquor to further neutralizing and edulcorating reaction in a submerged circulating impinging stream reactor, and performing solid-liquid separation after the reaction so as to obtain mother liquor; adding a dispersant into the mother liquor, and continuing to feed the ammonia gas for magnesium precipitation reaction so as to reach a pH value of 10-11; performing solid-liquid separation, washing and drying after the reaction so as to obtain nanometer magnesium hydroxide powder. The nanometer magnesium hydroxide prepared by the method has the purity up to 98%, is small in particle size and regular in shape and can be widely applied to the fields of fire retardants and flue gas desulfurizing agents, and secondary utilization of resources is achieved effectively.

Description

technical field [0001] The invention belongs to the technical field of waste liquid treatment and reuse, and in particular relates to a method for preparing nano-scale magnesium hydroxide through phosphate rock demagnesization waste liquid. Background technique [0002] The magnesium removal waste liquid produced by the chemical method of magnesium removal from phosphate ore is mainly composed of MgO and a small amount of PO 4 3- And metal ions, if directly discharged, it will cause problems such as waste of resources and environmental pollution. The magnesium element in the magnesium removal waste liquid is recycled and used to prepare nano-magnesium hydroxide products and other by-products (the by-product magnesium ammonium phosphate can be used as a slow-release fertilizer), so as to realize the secondary utilization of resources. Use provides a way. Secondly, the magnesium removal waste liquid after precipitation and separation of magnesium hydroxide can be returned t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/20B82Y40/00
CPCC01F5/20C01P2004/64C01P2006/80
Inventor 周玉新罗单张林锋刘祎候学娟
Owner WUHAN INSTITUTE OF TECHNOLOGY
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