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Method for preparing flame retardant with phosphate rock

A technology of flame retardant and phosphate rock, which is applied in the chemical industry, can solve the problems of increasing the consumption of phosphoric acid and increasing the preparation cost of phosphorus and nitrogen flame retardants, and achieve the effect of reducing the preparation cost

Inactive Publication Date: 2013-05-01
贵州合众拓源磷资源综合利用技术股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At the same time, the preparation of phosphorus-nitrogen flame retardants with increasing demand is based on high-purity phosphoric acid as one of the raw materials, which undoubtedly further increases the consumption of phosphoric acid and increases the cost of phosphorus-nitrogen flame retardants. preparation cost
However, there are no relevant reports on the technology of directly synthesizing phosphorus-nitrogen composite flame retardants with medium and low-grade phosphate rock as the initial raw material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh P 2 O 5 100g of phosphate rock powder with a content of 17.6wt% was put into 250g of 37wt% hydrochloric acid solution, and stirred at 35℃ for 3h, 10g of 25wt% sodium nitrate solution was added, and then stirred for 1h, left standing, and layered Get the upper layer of phosphorus-containing leaching solution, P 2 O 5 The leaching rate is 99.63%;

[0029] Add a sodium hydroxide solution with a concentration of 10wt% to the phosphorous-containing leachate in a stirring state until the pH of the phosphorous-containing leachate is 1.5, stop adding the sodium hydroxide solution, continue stirring for 0.5h, and then filter to obtain filtrate A;

[0030] Add 20g of 15wt% sodium citrate solution to filtrate A at a temperature of 20°C and stirring. After stirring for 0.5h, add 62g of melamine, switch to a shear emulsifier for dispersion reaction for 1h, and filter to obtain a filter residue. The extraction rate of phosphorus is 99.45%;

[0031] Put the deionized water and the fi...

Embodiment 2

[0034] Weigh P 2 O 5 100g of phosphate rock powder with a content of 17.6wt% was put into 300g of 20wt% hydrochloric acid solution, and stirred at 50°C for 3h, 10g of 20wt% sodium chloride solution was added, and then stirred for 0.5h and left to stand. The upper layer contains phosphorus leaching solution, P 2 O 5 The leaching rate is 99.33%;

[0035] Add ammonium bicarbonate solution with a concentration of 10wt% to the phosphorus-containing leachate in a stirring state until the pH of the phosphorus-containing leachate is 2.0, stop adding the ammonium bicarbonate solution, continue to stir for 1h, and then filter to obtain filtrate A;

[0036] Under the temperature of 40℃ and stirring, add 60g of 5wt% disodium ethylenediaminetetraacetic acid solution to filtrate A, after stirring for 1h, add 40g of melamine, switch to shear emulsifier for dispersion reaction for 2h, then filter The filter residue is obtained, and the extraction rate of phosphorus is 99.01%;

[0037] Put deionize...

Embodiment 3

[0040] Weigh P 2 O 5 100g of phosphate rock powder with a content of 17.6wt% was put into 400g of 15wt% hydrochloric acid solution, and stirred at 90℃ for 4h, 16g of 24wt% potassium chloride solution was added, and then stirred for 1.5h and left to stand. The upper layer contains phosphorus leaching solution, P 2 O 5 The leaching rate of 99.78%;

[0041] Add the lime emulsion with a concentration of 10wt% to the phosphorus-containing leaching solution in a stirring state until the pH of the phosphorus-containing leaching solution is 2.0, stop adding the lime emulsion, continue stirring for 1.5h, and then filter to obtain filtrate A;

[0042] At a temperature of 50°C and stirring, add 25g of a 20wt% sodium tartrate solution to the filtrate A. After stirring for 0.7h, add 90g of melamine, switch to a shear emulsifier for dispersion reaction for 0.8h, and filter to obtain a filter residue. The extraction rate of phosphorus is 99.10%;

[0043] Put toluene and filter residue into the re...

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Abstract

The invention discloses a method for preparing flame retardant with phosphate rock. According to the invention, phosphate rock, particularly phosphate rock of middle-low-grade, is taken as an initial raw material, phosphorus-nitrogen type halogen-free composite flame retardant is synthesized directly, and the cost of the phosphorus-nitrogen type halogen-free composite flame retardant is reduced. Moreover, according to the method, the utilization ratio of phosphorus in phosphate rock can be more than 95 percent, so that the method is an effective method for solving problems in developing and utilizing Chinese middle-low-grade phosphate rock.

Description

[0001] Technical field [0002] The invention relates to a method for preparing a flame retardant using phosphate rock, and belongs to the field of chemical technology. Background technique [0003] With the rapid development of polymer synthetic materials, polymer materials have gradually replaced traditional materials and are widely used in chemical, machinery, electronics, automobiles, aerospace and other fields. However, most of the polymer materials are combustible or combustible materials. Therefore, in order to enable the safe application of polymer materials, the development and application of flame retardants have also been rapidly developed. Traditional halogen-containing flame retardants have gradually withdrawn from the application field because they produce toxic gases and pollute the environment during combustion. The development and application of halogen-free flame retardants have become the current research focus. [0004] Phosphorus-nitrogen flame retardants are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/3492C08L23/12
Inventor 聂登攀王振杰薛安赵伟毅薛涛吴向党张新吴学庆何灏吴素彬赵丽君刘安荣
Owner 贵州合众拓源磷资源综合利用技术股份有限公司
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