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Method for preparing flame retardant by acidolysis of high-magnesium phosphate tailings with hydrochloric acid

A high-magnesium phosphorus tailings and flame retardant technology, applied in the field of waste resource utilization, can solve the problems of low added value of products and low utilization rate of phosphorus tailings resources, and achieve good flame retardant effect, huge economy, The effect of reducing processing costs

Pending Publication Date: 2020-06-19
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a method for preparing flame retardants by using hydrochloric acid to hydrolyze high-magnesium phosphorus tailings, so as to solve the problems of low resource utilization rate of existing phosphorus tailings and low added value of products

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  • Method for preparing flame retardant by acidolysis of high-magnesium phosphate tailings with hydrochloric acid

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Effect test

Embodiment 1

[0029] combine figure 1 As shown, the method for preparing flame retardant by hydrochloric acid hydrochloric acid hydrolysis of high-magnesium phosphorus tailings specifically includes the following steps:

[0030] 1) Measure 490mL of industrial hydrochloric acid with a mass fraction of 33.3% (10.41mol / L) in a clean three-necked flask, weigh 261.8g of high-magnesium phosphorus tailings powder, and gradually add high-magnesium phosphorus tailings to the three-necked flask, After adding the high-magnesium phosphorus tailings, turn on the condensed water, start stirring, and reflux at 50°C for 35 minutes to carry out acidolysis reaction. After the acidolysis reaction is completed, heat-preserve and suction filter at 60°C, and wash the silicon slag obtained by suction filtration with 140mL distilled water Twice, and mix the acidolysis filtrate obtained by the primary washing solution and suction filtration to obtain the acidolysis solution A and silicon slag;

[0031] 2) Pour the...

Embodiment 2

[0038] combine figure 1 As shown, the method for preparing flame retardant by hydrochloric acid hydrochloric acid hydrolysis of high-magnesium phosphorus tailings specifically includes the following steps:

[0039] 1) Measure 490mL of industrial hydrochloric acid with a mass fraction of 33.3% (10.41mol / L) in a clean three-necked flask, weigh 261.8g of high-magnesium phosphorus tailings powder, and gradually add high-magnesium phosphorus tailings to the three-necked flask, After adding the high-magnesium phosphorus tailings, turn on the condensed water, start stirring, and reflux at 50°C for 35 minutes to carry out acidolysis reaction. After the acidolysis reaction is completed, heat-preserve and suction filter at 60°C, and wash the silicon slag obtained by suction filtration with 140mL distilled water Twice, and mix the acidolysis filtrate obtained by the primary washing solution and suction filtration to obtain acidolysis solution A and silicon slag;

[0040] 2) Pour the aci...

Embodiment 3

[0047] combine figure 1 As shown, the method for preparing flame retardant by hydrochloric acid hydrochloric acid hydrolysis of high-magnesium phosphorus tailings specifically includes the following steps:

[0048] 1) Measure 490mL of industrial hydrochloric acid with a mass fraction of 33.3% (10.41mol / L) in a clean three-necked flask, weigh 261.8g of high-magnesium phosphorus tailings powder, and gradually add high-magnesium phosphorus tailings to the three-necked flask, After adding the high-magnesium phosphorus tailings, turn on the condensed water, start stirring, and reflux at 50°C for 35 minutes to carry out acidolysis reaction. After the acidolysis reaction is completed, heat-preserve and suction filter at 60°C, and wash the silicon slag obtained by suction filtration with 140mL distilled water Twice, and mix the acidolysis filtrate obtained by the primary washing solution and suction filtration to obtain the acidolysis solution A and silicon slag;

[0049] 2) Pour the...

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Abstract

The invention provides a method for preparing a composite flame retardant from phosphate tailings. The method comprises the following steps: decomposing phosphate tailings by using hydrochloric acid to obtain an acidolysis liquid A and silicon slag, standing and crystallizing the acidolysis solution A, carrying out solid-liquid separation to obtain an acidolysis liquid B and calcium chlorophosphate, then separating calcium and magnesium in the acidolysis liquid B by adopting a precipitant to obtain an acidizing liquid C and calcium sulfate whiskers, finally oxidizing the acidizing liquid C toremove impurities, adding a modifier, and adding an alkaline precipitant at a certain temperature to obtain a compound of modified magnesium hydroxide and an organic flame retardant. In preparation ofmagnesium hydroxide from phosphate tailings, by addition of the modifier, the magnesium hydroxide with good compatibility with the polymer is obtained, the composite flame retardant is compounded with the organic flame retardant and has an organic-inorganic synergistic flame retardant effect, so that the obtained composite flame retardant has a good flame retardant effect, a new way is provided for resource utilization of the phosphate tailings, the additional value of phosphate tailing products is greatly increased, and the composite flame retardant has huge economic, social and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of waste resource utilization, in particular to a method for preparing a flame retardant by hydrolyzing high-magnesium phosphorus tailings with hydrochloric acid. Background technique [0002] Phosphorus tailings mainly come from the tailings left after beneficiation and extraction of concentrate, which belongs to mining solid waste in industrial solid waste. Its minerals mainly include dolomite, fluorophosphorite and quartz, and its CaO content is about 30.0-34.0%. 2 o 5 The content is about 4-8.5%, and the MgO content is about 12-18%. [0003] With the increase of phosphate rock mining, the amount of phosphate tailings is also rising rapidly. Every 1t of phosphorous concentrate produced will produce 0.44t of phosphorous tailings. Phosphorus tailings mainly include flotation phosphorous tailings, phosphorous slag, and phosphorite sludge. Solid waste, with an average MgO content greater than 15%, is a ma...

Claims

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Application Information

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IPC IPC(8): C01F11/46C01F5/20C01F5/22C01B25/455C08K9/04C08K3/22C08L63/00
CPCC01F11/46C01F5/20C01F5/22C01B25/455C08K9/04C08K9/08C08K3/22C08K2003/2224C08L2201/02C01P2004/10C08L63/00
Inventor 张华丽张家鑫潘益夏衍潘志权
Owner WUHAN INSTITUTE OF TECHNOLOGY