Preparation method of ultrafine aluminium hydroxide

A technology of ultra-fine aluminum hydroxide and carbon dioxide, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of easy blockage of RPB devices, achieve shortened carbonization time, good quality, and large specific surface area Effect

Inactive Publication Date: 2006-03-29
XIANGTAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there is a defect that the RPB device is easily blocked due to the particularity of the ultrafine particle system

Method used

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  • Preparation method of ultrafine aluminium hydroxide
  • Preparation method of ultrafine aluminium hydroxide
  • Preparation method of ultrafine aluminium hydroxide

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preparation example Construction

[0038] 2. The preparation of granular ultrafine aluminum hydroxide products is mainly completed by a one-step direct method under the condition of high gravity of the spiral channel type rotating bed. 3000rpm, the ratio of gas (calculated as net carbon dioxide in standard state) to liquid is 1-20, and the concentration of CO will not be higher than 30%. 2 Gas and NaAlO with a concentration of 0.05-2mol / L 2 The solution is passed into the rotor of the reactor through the air inlet and the liquid inlet pipe respectively, and an organic polymer dispersant with a mass content of 1-2% is added, and the gas-liquid-solid multiphase transfer is carried out in the spiral channel of the reactor rotor. Quality reaction, that is, carbonization reaction, the temperature of carbonization reaction is controlled at 0-100°C, the temperature and pH value are recorded regularly, and the CO2 is stopped when the pH value reaches 11-12 2 Gas, reduce the speed of reactor 4 and recirculate for a per...

Embodiment 1

[0044] Embodiment 1: adopt technological process of the present invention as figure 1 , extract a certain volume of sodium aluminate solution, filter and remove impurities, and dilute to 0.4mol / L, and place it in the circulation tank 13. The liquid port 8 enters the spiral channel of the rotor 5 through the distributor 15; the high concentration of CO 2 After the gas is decompressed from the gas source of the steel cylinder, it passes through the gas valve 1 and the gas flow meter 2 from the inlet 3 and 9 to the outside of the spiral channel and enters the spiral channel of the rotor 5 of the rotating bed RBHC. The gas-liquid volume flow ratio is 3, CO 2 Gas and sodium aluminate solution are reversely contacted in the rotating spiral channel for carbonization reaction. During the carbonization reaction, 1-2% by mass of organic polymer dispersant is added to generate nano-sized aluminum hydroxide ultrafine particles, and the remaining gas flows from the spiral The center of t...

Embodiment 2

[0045] Embodiment 2: This embodiment 2 is except identical with embodiment 1, and its different variation with embodiment 1 is: the concentration of sodium aluminate solution is 0.2mol / L, passes into the CO of high concentration 2 Gas, the rotation speed of rotor 5 is 1000rpm. After the carbonization reaction is complete, the gel is filtered and washed, then added with deionized water, placed in water at 97°C for heating and aging for 6 hours, filtered, washed and dried at 100°C with isobutanol to obtain Fibrous superfine aluminum hydroxide.

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Abstract

A process for preparing superfine aluminium hydroxide includes such steps as carbonifying reaction between NaAlO2 solution and the gas containing CO2 in gravitation condition to obtain aluminium hydroxide gel, preparing superfine aluminium hydroxide, filtering, washing, and drying. The product (nanofibers or nanoparticles of aluminium hydroxide) can be used as inorganic flame-retarding agent or for preparing catalyst.

Description

technical field [0001] The invention relates to a method for preparing aluminum hydroxide, in particular to a method for preparing superfine aluminum hydroxide of different crystal forms by using sodium aluminate solution under high gravity carbonization reaction conditions. Background technique [0002] Aluminum hydroxide is currently the most widely used inorganic flame retardant in the world. It is widely used in many industries such as plastics, building materials, polymer materials, and electronics due to its non-toxic, halogen-free, and low-smoke flame retardant characteristics. Nano-scale active aluminum hydroxide flame retardant is one of the halogen-free flame retardants for synthetic materials. It has three functions of flame retardancy, smoke elimination and filling. There is no secondary pollution when burning, and the specific surface area of ​​ultra-fine aluminum hydroxide is larger. Larger, higher surface energy, better flame retardant effect, as an additive, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 周继承李友凤廖立民谢放华赵虹
Owner XIANGTAN UNIV
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