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Method for preparing calcium-magnesium-aluminum iron hydrotalcite by taking high-magnesium phosphate tailings as raw material

A technology for high magnesium phosphorus tailings and phosphorus tailings is applied in the field of waste resource utilization, which can solve the problems of low utilization rate of phosphorus tailings resources and low added value of products, and achieve excellent flame retardant performance and interlayer ions. Exchangeability, no pollution in the preparation process, the effect of increasing added value

Inactive Publication Date: 2020-06-16
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention aims to propose a method for preparing calcium-magnesium-aluminum-ferrotalcite from high-magnesium phosphorus tailings to solve the problems of low resource utilization rate of existing phosphorus tailings and low added value of products

Method used

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  • Method for preparing calcium-magnesium-aluminum iron hydrotalcite by taking high-magnesium phosphate tailings as raw material
  • Method for preparing calcium-magnesium-aluminum iron hydrotalcite by taking high-magnesium phosphate tailings as raw material

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Embodiment 1

[0032] A method for preparing calcium-magnesium-aluminum-iron hydrotalcite using high-magnesium phosphorus tailings as raw material, specifically comprising the following steps:

[0033] 1) Mix 100g of phosphorous tailings with 100g of tap water and add them into a blender for full stirring, then filter and dry the cleaned phosphorous tailings, then place them in a muffle furnace for calcination at 800°C for 1 hour to remove residual After removing organic impurities such as organic flotation agents, phosphorus tailings from which organic impurities have been removed are obtained;

[0034] 2) Mix the phosphorous tailings from step 1) with the dilute nitric acid whose mass fraction is 5%, and add it into the acidolysis reactor, heat up to 80°C, and after the acidolysis reaction for 0.5 hours, heat-preserve and filter, then, Add activated carbon to the filtrate at a dosage of 20g / L, that is, add 20g of activated carbon to 1L of filtrate, stir and filter to obtain refined acidoly...

Embodiment 2

[0039] A method for preparing calcium-magnesium-aluminum-iron hydrotalcite using high-magnesium phosphorus tailings as raw material, specifically comprising the following steps:

[0040] 1) Mix 100g of phosphorous tailings with 100g of tap water and add them to the mixer, stir well, filter and dry the cleaned phosphorous tailings, and then place them in a muffle furnace for calcination at 600°C for 2 hours to remove residual After removing organic impurities such as organic flotation agents, phosphorus tailings from which organic impurities have been removed are obtained;

[0041] 2) Mix the phosphorous tailings from step 1) with the dilute nitric acid with a mass fraction of 20%, add it into the acidolysis reactor, heat up to 60°C, and after the acidolysis reaction for 1 hour, heat-preserve and filter, then, Add activated carbon to the filtrate at a dosage of 20g / L, that is, add 20g of activated carbon to 1L of filtrate, stir and filter to obtain refined acidolysis filtrate A...

Embodiment 3

[0046] A method for preparing calcium-magnesium-aluminum-iron hydrotalcite using high-magnesium phosphorus tailings as raw material, specifically comprising the following steps:

[0047] 1) Mix 100g of phosphorous tailings with 100g of tap water and add them into a blender for full stirring, filter and dry the cleaned phosphorous tailings, then place them in a muffle furnace and calcinate at 500°C for 3 hours to remove residual After removing organic impurities such as organic flotation agents, phosphorus tailings from which organic impurities have been removed are obtained;

[0048] 2) Mix the phosphorous tailings from step 1) with the dilute nitric acid with a mass fraction of 33%, add it to the acidolysis reactor, heat up to 35°C, and perform the acidolysis reaction for 2.5 hours, then heat-preserve and filter, then, Add activated carbon to the filtrate at a dosage of 20g / L, that is, add 20g of activated carbon to 1L of filtrate, stir and filter to obtain refined acidolysis...

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Abstract

The invention provides a method for preparing calcium-magnesium-aluminum iron hydrotalcite by taking high-magnesium phosphate tailings as a raw material. The method comprises the following steps: washing, drying and calcining phosphate tailings to remove organic matters, soaking and dissolving the phosphate tailings in acid, adding a dephosphorizing agent for reaction to remove phosphorus, performing filtering to obtain a calcium-magnesium salt solution, adding an aluminum salt solution and an iron salt solution into the calcium-magnesium salt solution, dropwisely adding the mixed solution into an alkaline solution B, carrying out coprecipitation reaction, and carrying out crystallizing, cooling, filtering, washing and drying to obtain the calcium-magnesium-aluminum-iron hydrotalcite. Thecalcium-magnesium-aluminum hydrotalcite prepared by taking high-magnesium phosphate tailings as a raw material has excellent flame retardant property and interlayer ion exchangeability, and can be widely applied to the fields of plastics, environmental protection and the like. A new way is opened up for comprehensive utilization of the phosphate tailings, the additional value of phosphate tailingproducts is greatly improved, the problem of environmental pollution caused by the phosphate tailings is solved, the ecological environment is improved, and huge economic, social and environmental benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of waste resource utilization, in particular to a method for preparing calcium-magnesium-aluminum-iron hydrotalcite by using high-magnesium phosphorus tailings as raw materials. Background technique [0002] my country is rich in phosphate rock resources, but most of them are "abundant but not rich". At the same time, after the phosphate rock mining and dressing technology reaches a certain bottleneck, some enterprises "mining the rich and abandoning the poor" and "mining are easy to discard and difficult to mine", resulting in phosphorus The ore utilization rate is low, and a large amount of low- and medium-grade phosphate rocks are left during mining and dressing. Phosphorus tailings in my country are mainly wastes left after phosphate ore flotation concentrate. These solid wastes are directly stored in the tailings pool, which still contains some valuable components that have not been utilized. As time go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/009C01P2002/72C01P2004/03C01P2002/22
Inventor 吴汉军张华丽潘益潘志权
Owner WUHAN INSTITUTE OF TECHNOLOGY
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