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Method for preparing composite flame retardant of organic acid pillared hydrotalcite using phosphorus tailings

A technology of composite flame retardant and organic acid column, which is applied in the field of waste resource utilization, can solve the problems of low resource utilization rate of phosphorus tailings and low added value of products, and achieve reduction of preparation costs, huge economy, and improvement of ecology environmental effects

Active Publication Date: 2021-10-12
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 a composite flame retardant of organic acid pillared hydrotalcite by using phosphorus tailings, so as 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 composite flame retardant of organic acid pillared hydrotalcite using phosphorus tailings
  • Method for preparing composite flame retardant of organic acid pillared hydrotalcite using phosphorus tailings

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Embodiment 1

[0031] A method for preparing a composite flame retardant of organic acid pillared hydrotalcite by utilizing phosphorus tailings, specifically comprising the following steps:

[0032] 1) Weigh 100g of phosphorus tailings, wash them repeatedly, dry them, place them in a muffle furnace and calcinate them at 600°C for 3 hours, remove organic impurities, and obtain impurity-removed phosphorus tailings;

[0033] 2) Add 80ml of hydrochloric acid into the stirring reactor, start stirring, raise the temperature to 50°C, slowly add the phosphorus tailings that have been removed in step 1), stir and react for 2.5 hours, after the leaching reaction is fully carried out, heat-preserve and filter, and then , add white clay to the above-mentioned filtrate by the dosage of 20g / L, stir, filter, obtain refined inorganic acid decomposition filtrate A;

[0034] 3) Add the inorganic acid decomposition filtrate A in step 2) into a three-necked flask, stir and dropwise add ammonia water with a mass...

Embodiment 2

[0038] A method for preparing a composite flame retardant of organic acid pillared hydrotalcite by utilizing phosphorus tailings, specifically comprising the following steps:

[0039] 1) Weigh 100g of phosphorus tailings, wash them repeatedly, then dry them, place them in a muffle furnace and calcinate at 700°C for 2 hours, remove organic impurities, and obtain impurity-removed phosphorus tailings;

[0040] 2) Add 70ml of hydrochloric acid into the stirred reactor, start stirring, heat up to 60°C, slowly add the phosphorus tailings that have been removed in step 1), stir and react for 2 hours, after the leaching reaction is fully carried out, heat-preserve and filter, and then , add clay to the above-mentioned filtrate according to the dosage of 30g / L, stir, filter, obtain refined inorganic acid decomposition filtrate A;

[0041] 3) Add the inorganic acid decomposition filtrate A in step 2) into a three-necked flask, stir and dropwise add ammonia water with a mass fraction of ...

Embodiment 3

[0045] A method for preparing a composite flame retardant of organic acid pillared hydrotalcite by utilizing phosphorus tailings, specifically comprising the following steps:

[0046] 1) Weigh 100g of phosphorous tailings, wash them repeatedly, then dry them, place them in a muffle furnace and calcinate them at 800°C for 1 hour, remove organic impurities, and obtain impurity-removed phosphorous tailings;

[0047] 2) Add 77ml of hydrochloric acid into the stirred reactor, start stirring, raise the temperature to 70°C, slowly add the phosphorus tailings that have been removed in step 1), stir and react for 1.5 hours, after the leaching reaction is fully carried out, heat-preserve and filter, and then , add white clay to the above-mentioned filtrate by the dosage of 40g / L, stir, filter, obtain refined inorganic acid decomposition filtrate A;

[0048] 3) Add the inorganic acid decomposition filtrate A in step 2) into a three-necked flask, stir and dropwise add ammonia water with a...

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Abstract

The invention provides a method for preparing a composite flame retardant of organic acid pillared hydrotalcite by using phosphorus tailings. The method comprises the following steps: washing the high-magnesium phosphorus tailings obtained by phosphate rock flotation, calcining to remove organic matter, and mixing with Inorganic acids are mixed to obtain Ca-containing 2+ , Mg 2+ solution; to the Ca 2+ , Mg 2+ A certain amount of ammonia water is added to the solution to remove impurities, after filtration, a certain amount of aluminum salt solution is added, stirred and mixed, an alkaline solution is added dropwise, reacted, and crystallized to obtain calcium magnesium aluminum hydrotalcite; Add a certain concentration of organic acid sodium salt solution to talc, stir vigorously, react, crystallize, filter, wash until neutral, dry, and grind into powder to obtain organic-inorganic acid pillared hydrotalcite with excellent flame retardancy Flame retardant products. The organic-inorganic chelated flame retardant material obtained by the invention has excellent flame retardancy, and effectively recycles and utilizes valuable elements in the high-magnesium phosphorus tailings, which opens up a new way for the comprehensive utilization of the phosphorus tailings.

Description

technical field [0001] The invention relates to the technical field of resource utilization of waste, in particular to a method for preparing a composite flame retardant of organic acid pillared hydrotalcite by utilizing phosphorus tailings. Background technique [0002] my country is rich in phosphate rock resources, but with the continuous mining of high-grade phosphate rock that is easy to mine and select, it gradually decreases. In the flotation enrichment process of phosphate ore, the part with higher phosphorus content produced is directly used as concentrate to prepare various phosphorus chemical products in phosphorus chemical industry, while the produced components with lower phosphorus content and more impurity minerals will be directly discarded. It is stored in the tailings pond as an open-pit pile of phosphorus tailings. Phosphorus tailings are randomly piled up in the tailings pond, which not only consumes huge funds, but also takes up a lot of land; at the sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/26C08K5/5317C08K5/17C01F11/00
CPCC01F11/00C08K3/26C08K5/175C08K5/5317
Inventor 张华丽吴汉军潘益潘志权
Owner WUHAN INSTITUTE OF TECHNOLOGY
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