A kind of thermoplastic phosphogypsum filling material and preparation method thereof

A filling material and phosphogypsum technology, which is applied in the deep processing modification and application field of phosphate rock by-products, can solve the problems of restricting the large-scale industrial application of phosphogypsum, difficulty in reflecting the high consumption of phosphogypsum, and the low addition and usage of phosphogypsum. , to avoid the effects of toxic and side effects, excellent flame retardancy and thermal stability, uniform dispersion

Active Publication Date: 2018-06-26
陕西睿智环保建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when phosphogypsum is used in plastic products, due to the multi-component and multi-performance effects of phosphogypsum itself, it will destroy the chemical bonds of the plastic components when it is mixed with plastic, which will promote the deterioration of the plastic resin performance.
In addition, the current investment in deep processing and modification of phosphogypsum is weak. Under the existing technical conditions, phosphogypsum can only be used in a relatively small amount in the plastic field, and it is difficult to reflect the high consumption of phosphogypsum in the plastic field. , which to some extent limits the large-scale industrial application of phosphogypsum in plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Mix phosphogypsum with 20% free moisture and calcium hydroxide stacked outdoors in a mixer evenly at a mass ratio of 100:5, let it age for 2 days, and then send it to a single-rotor hammer dryer with the temperature set at Under the condition of 200°C, the water vaporized by the dried object is discharged through a dry dust collector, a wet dust collector, and a condenser, and dried for 1 hour to remove volatile matter, free water and part of crystal water to obtain dry powder phosphogypsum;

[0041] 2) The dry powder phosphogypsum obtained in step 1) is cold mixed with inorganic lubricant powder and dispersant at a mass ratio of 100:5:2, and then sent to a vortex jet mill, and the dry powder is made by the high-speed vortex formed by high-speed gas rotation. Phosphogypsum collides with inorganic lubricating powder and dispersant, grinds and refines each other, and inorganic lubricating powder is embedded with phosphogypsum during the refinement process of dry powder ...

Embodiment 2

[0046] 1) Mix phosphogypsum with free moisture of 25% and calcium hydroxide stacked outdoors in a mixer evenly at a mass ratio of 100:3, let it stand for 2 days, and then send it to a rotary dryer with the temperature set at 300°C Under certain conditions, the water vaporized by the dried object is discharged through a dry dust collector, a wet dust collector, and a condenser, and dried for 1 hour to remove volatile matter, free water and part of crystal water to obtain dry powder phosphogypsum;

[0047] 2) Mix the dry phosphogypsum powder obtained in step 1) with inorganic lubricating powder and dispersant in a mass ratio of 100:5:2, and then send it into a fluidized bed jet mill to form a high-speed vortex through high-speed gas rotation. Make the dry powder phosphogypsum collide with the inorganic lubricating powder and dispersant, grind and refine each other, and the inorganic lubricating powder is inlaid with the phosphogypsum through the anchoring group of the dispersant ...

Embodiment 3

[0052] 1) Mix the phosphogypsum powder and calcium hydroxide naturally stacked outdoors evenly at a mass ratio of 100:3, put it in the oven for more than 36 hours, then send it to a stirring dryer, and dry it at 150°C for 2 hours to remove volatile matter and free water and part of crystal water to obtain dry powder phosphogypsum;

[0053] 2) Mix the dry phosphogypsum powder obtained in step 1) with inorganic lubricating powder and dispersant in a mass ratio of 100:4:3, and then send it into the rotary jet jet mill, and use the high-speed vortex formed by high-speed gas rotation to make Dry powder phosphogypsum collides with inorganic lubricating powder and dispersant, grinds and refines each other, and inorganic lubricating powder is embedded with phosphogypsum through the anchoring group of dispersant during the refinement process of dry powder phosphogypsum to form a composite powder with good self-fluidity body, that is, the first layer of coating layer with fluidity and l...

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Abstract

The invention relates to deep processing modification and application of phosphorus ore byproduct phosphorus gypsum, and discloses a phosphorus gypsum filling material with thermoplastic processing performance. The phosphorus gypsum filling material is characterized in that a first cladding layer with flowing lubricity is formed on the surface of dry powdery phosphorus gypsum, a second hydrophobic layer is formed on the first cladding layer, and a third hot melt layer is formed on the second hydrophobic layer. The invention further provides a preparation method. Inorganic lubricant powder and the phosphorus gypsum are collided, ground and refined under the action of a high-speed jet mill by virtue of flowing lubricity of the inorganic lubricant powder, and anchoring groups of a dispersing agent are embedded with the phosphorus gypsum in a refining process of the dry powdery phosphorus gypsum, so that the phosphorus gypsum is endowed with high rheological processability, problems about high-filling application of the phosphorus gypsum filling material to plastics are radically solved, the phosphorus gypsum filling material is used for large products such as PVC enclosure wall baffle plates, agricultural seedling growing flowerpots, stone paper and garbage bags, the consumption of the phosphorus gypsum can be greatly improved, and the industrial application of the phosphorus gypsum to plastics is promoted.

Description

technical field [0001] The invention relates to deep processing modification and application of phosphate rock by-products, in particular to a phosphogypsum filling material with thermoplastic processability and a preparation method thereof. Background technique [0002] Phosphogypsum is the industrial waste generated from mining phosphate rock to produce phosphoric acid, phosphate fertilizer, and phosphate detergent. Phosphogypsum is mostly off-white, yellow, gray-yellow, with a density of 2.05-2.45g / cm3 and a bulk density of 0.85 g / cm3. It is usually a moist fine powder, 95% of the particles are less than 0.2mm, and the free water content is 20%-30%. It is acidic, and its pH value is generally below 4.5. It is a multi-component complex crystal. The main component is calcium sulfate dihydrate, and its content is about 70% or more. [0003] The main impurity of phosphogypsum is phosphorus, followed by alkali metal salts, silicon, iron, aluminum, magnesium and other impuriti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/10C08K9/08C08K3/30C08L27/06C08L23/06
CPCC08K3/30C08K9/08C08K9/10C08K2003/3045C08L2203/16C08L2207/062C08L27/06C08L23/06
Inventor 陈庆曾军堂
Owner 陕西睿智环保建材有限公司
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