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Nano oxide composite powder and preparation method

A nano-oxide and composite powder technology, applied in the preparation of oxides/hydroxides, chemical instruments and methods, nanotechnology, etc., can solve the problems of inability to be widely used, high cost of raw materials, and inability to large-scale production, etc. Achieve the effect of low manufacturing cost, low cost and easy large-scale production

Inactive Publication Date: 2015-05-13
苏州华微特粉体技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the raw materials used for nano-microporous insulation panels are made by mixing various high-purity nano-scale oxide powders, and these oxide powders are synthesized by chemical vapor deposition using high-purity raw materials, and then mixed according to a certain ratio. , resulting in high cost of raw materials, cannot be mass-produced, can only be used in high-end technical fields, and cannot be widely used

Method used

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  • Nano oxide composite powder and preparation method
  • Nano oxide composite powder and preparation method

Examples

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specific Embodiment example 1

[0066] This embodiment is completed in a chlorination furnace with a boiling section diameter of 0.5m and a boiling height of 1m. Preheat the hydrolysis reactor and chlorination furnace to 900°C and 1000°C respectively. Pass the pre-granulated fly ash and reducing agent into the chlorination furnace at a flow rate of 840g / min. The particle size of the granulated fly ash is controlled to be 60 mesh to 100 mesh. The composition of the granulated fly ash is :

[0067]

[0068] The mixed gas of chlorine and oxygen is passed into the chlorination furnace at 735NL / min, wherein the concentration of chlorine is 85 (vt)%, and the concentration of oxygen is 15 (vt)%. The water vapor is passed into the hydrolysis reactor, the water vapor flow rate is 1670NL / min, and the water vapor temperature is 900°C. After the two-step reaction of chlorination and hydrolysis, the nano-oxide composite powder with a primary particle size of 15nm is obtained through gas-solid separation, and the tai...

specific Embodiment example 2

[0071] This embodiment is completed in a chlorination furnace with a boiling section diameter of 0.5m and a boiling height of 1m. Preheat the hydrolysis reactor and chlorination furnace to 800°C and 1000°C respectively. The raw material is a mixture of coal gangue, clinker and carbon, and the composition of the mixture is:

[0072]

[0073] Pass the pre-granulated mixture and reducing agent into the chlorination furnace at a flow rate of 900g / min, and control the particle size of the granulated mixture to 60 mesh to 100 mesh; pass the mixed gas of chlorine and oxygen at 755NL / min Chlorination furnace, wherein the concentration of chlorine gas is 85(vt)%, and the concentration of oxygen is 15(vt)%. The water vapor is passed into the hydrolysis reactor, the water vapor flow rate is 1685NL / min, and the water vapor temperature is 900°C. After the two-step reaction of chlorination and hydrolysis, the nano-oxide composite powder with a primary particle size of 15nm is obtained ...

specific Embodiment example 3

[0092] This embodiment is completed in a molten salt chlorination furnace. Preheat the oxidation reactor and chlorination furnace to 900°C and 820°C respectively. Pass the pre-mixed fly ash and reducing agent into the chlorination furnace at a flow rate of 840g / min. The fly ash composition is:

[0093]

[0094] The mixed gas of chlorine and oxygen is passed into the chlorination furnace at 735NL / min, wherein the concentration of chlorine is 90(vt)%, and the concentration of oxygen is 10(vt)%. Pass oxygen into the oxidation reactor, the oxygen flow rate is 1670NL / min, and the oxygen temperature is 900°C. After the two-step reaction of chlorination and oxidation, the nano-oxide composite powder with a primary particle size of 15nm is obtained through gas-solid separation, and the mixed gas is sent to subsequent purification treatment for discharge. The composition of nano oxide composite powder is:

[0095]

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Abstract

The invention discloses nano oxide composite powder and a preparation method. A chlorination technology is effectively combined with a chemical gas-phase deposition technology, one-step synthesis of the preparation of the nano oxide composite powder is realized, and scale production is easily realized. The method comprises the following steps: 1) firstly, mixing mixed oxide with a reducing agent, adding the mixture of mixed oxide and the reducing agent into fused salt to be heated to reach chlorination reaction temperature, performing chlorination reaction on the mixture and chlorine to produce chloride mixed gas; 2) heating the chloride mixed gas to reach oxidization reaction temperature; 3) heating oxygen to reach the oxidization reaction temperature and performing oxidization reaction on oxygen and the chloride mixed gas to produce solid-state nano oxide composite powder and chlorine-containing mixed gas; 4) performing gas-solid separation on the solid-state nano oxide composite powder and the chlorine-containing mixed gas, and collecting the prepared solid-state nano oxide composite powder; and 5) reducing the temperature of the chlorine-containing mixed gas and pressurizing to ensure that chlorine is liquefied, recovering liquid chlorine, and feeding other gas to a tail gas treatment system.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a nano-oxide composite powder produced by the effective combination of chlorination technology and chemical vapor deposition technology and its manufacturing method. The nano-oxide composite powder contains nano oxide. Background technique [0002] Nano-microporous thermal insulation board is a new type of high-performance thermal insulation material developed based on the principle of nano-microporous (microporous). It has a thermal conductivity lower than that of still air at room temperature, and is one of the high-temperature insulation materials with the best thermal insulation performance so far. However, at present, the raw materials used for nano-microporous insulation panels are made by mixing various high-purity nano-scale oxide powders, and these oxide powders are synthesized by chemical vapor deposition using high-purity raw materials, and then mixed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14B82Y30/00
CPCC01B13/22
Inventor 胡晞
Owner 苏州华微特粉体技术有限公司