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Method and device for preparing stannic oxide powder

A technology of tin dioxide powder and tin powder, which is applied in the direction of tin oxide, etc., can solve the problems of high cost, long technical process of powder production, and difficulty in industrialization, and achieve the effects of low cost, reduced manual operation, and simple equipment

Inactive Publication Date: 2012-10-03
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For existing SnO 2 Powder production technology has problems such as long process, high cost, and difficulty in industrialization. The present invention provides a method and device for preparing tin dioxide powder that is fast, convenient, and low in implementation cost.

Method used

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  • Method and device for preparing stannic oxide powder
  • Method and device for preparing stannic oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Firstly, 1000g of tin powder with an average particle size of about 500nm is prepared by the spray powder method; then the tin powder is placed in the automatic feeding mechanism ③, and the distance between the automatic feeding mechanism and the stainless steel belt is adjusted to control the thickness of the tin powder layer It is 3mm. Start the electric roller rotating device and set the pre-oxidation temperature to 200°C. The horizontal distance between the two stainless steel rollers in the "Z"-shaped turning mechanism is 30cm, and the longitudinal height difference is 10cm. Blow air with an air flow of 5.5L / h from the air supply hole ⑧, and the pre-oxidation time is 30min. The secondary oxidation temperature is 550℃, the air flow rate is 5.5L / h, and the secondary oxidation time is 60min. After the reaction, SnO is obtained 2 The powder is 1268.3g, the oxidation rate is 99.89%.

Embodiment 2

[0038] First, make 10Kg of tin powder with an average particle size of about 1μm by spraying powder method. Put the tin powder in the automatic feeding mechanism ③, adjust the distance between the automatic feeding mechanism and the stainless steel belt, and control the thickness of the tin powder layer to 5mm. The horizontal distance between the two stainless steel rollers in the "Z"-shaped turning mechanism is 10cm, and the longitudinal height difference is 20cm. Start the electric roller rotating device and set the pre-oxidation temperature to 225°C. Blow in air with an air flow of 7L / h from the air supply hole ⑧, and the pre-oxidation time is 40 minutes. The secondary oxidation temperature is 600℃, the air flow rate is 7L / h, and the secondary oxidation time is 90min. After the reaction, SnO is obtained 2 The powder is 12.69Kg, the oxidation rate is 99.95%.

Embodiment 3

[0040] First, 100Kg of tin powder with an average particle size of about 0.8μm is prepared by spraying powder method. The tin powder is placed in the automatic feeding mechanism ③, and the distance between the automatic feeding mechanism and the stainless steel belt is adjusted to control the thickness of the tin powder layer It is 12mm. The horizontal distance between the two stainless steel rollers in the "Z"-shaped turning mechanism is 60cm, and the longitudinal height difference is 40cm. Start the electric roller rotating device and set the pre-oxidation temperature to 230°C. Blow air with an air flow of 10L / h from the air supply hole ⑧, and the pre-oxidation time is 60min. The secondary oxidation temperature is 700℃, the air flow rate is 10L / h, and the secondary oxidation time is 180min. After the reaction, SnO is obtained 2 The powder is 126.86Kg, the oxidation rate is 99.92%.

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Abstract

The invention discloses a method and a device for preparing stannic oxide powder. The method comprises the following steps: placing atomizing tin powder into a matched oxidation device for primary oxidation; turning over the pre-oxidized tin powder, and carrying out secondary oxidation to obtain completely oxidized stannic oxide. With the adoption of the method and device for preparing the stannic oxide powder, a stainless steel belt is adopted to convey the material to a heating kiln; the middle section of the heating kiln is provided with two stainless rolling shafts with a certain interval and a certain altitude difference; the stainless steel belt crosses and is covered between the two rolling shafts to form a Z-shaped structure; and the pre-oxidized tin powder is turned off on the surface of the lower-layer stainless steel belt from the surface of an upper-layer stainless steel belt through the Z-shaped structure for carrying out the second oxidation. With the adoption of the method and the device for preparing the stannic oxide powder, the problem of continuous production of the stannic oxide powder is solved; complete oxidation of the tin powder with a higher material thickness can be realized, the problems of long process, difficult solid-liquid separation, reagent consumption and wastewater discharge and the like in preparing the stannic oxide powder by a liquid phase method are avoided; and the method and the device have the characteristics of being low in cost, having no three wastes emission and being easy to implement industrialization and the like.

Description

Technical field [0001] The invention belongs to the field of metallurgy and chemical engineering, and particularly relates to a method and device for preparing tin dioxide powder. Background technique [0002] SnO 2 Because of its special physical and chemical properties, the powder has a wide range of applications in optics, electricity, gas sensitivity, and humidity sensitivity. [0003] Existing SnO 2 The powder preparation methods include gas phase method, liquid phase method and solid phase synthesis method. The gas phase method uses high temperature (> 2260℃) SnO is volatilized, and then SnO is prepared by controlling certain reaction pressure, temperature, gas ratio and flow rate under harsh conditions such as arc and laser. 2 powder. SnO prepared by gas phase method 2 Although the purity and particle size of the product are relatively ideal, it is very difficult to scale production from the perspective of existing technical devices. [0004] Liquid phase methods include ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02
Inventor 杨建广张绪亮刘小文邓自祥
Owner CENT SOUTH UNIV
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