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Preparation method of bimodal gradation zirconium powder

A technology of zircon powder and grading, applied in manufacturing tools, casting equipment, metal processing equipment, etc., can solve the difficulty of fine particle refinement, the slow crushing efficiency of fine sand, and the inability to obtain bimodal particle size distribution, etc. problem, to achieve the effect of easy implementation and simple production process

Active Publication Date: 2019-11-22
江苏铸友锆钛科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the research on bimodal grading and grinding of raw sand, it is found that the crushing of particles is affected by its particle size, and the difficulty of further refining fine particles is correspondingly greater, which makes the crushing efficiency of coarse sand higher, and the crushing efficiency of fine sand is relatively lower. Slow, and eventually the two peaks gradually close to coincide, and the desired bimodal particle size distribution cannot be obtained
At present, no effective and easy-to-implement bimodal graded zircon powder preparation process has been reported

Method used

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  • Preparation method of bimodal gradation zirconium powder
  • Preparation method of bimodal gradation zirconium powder
  • Preparation method of bimodal gradation zirconium powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The particle size of the original zircon sand is greater than 150 mesh, and the D50 is 200±10μm.

[0030] Use a resistance furnace to heat, the heating temperature is 700 ° C, the holding time is 20 minutes, and then immersed in 15% saline solution to cool to room temperature, after cleaning and drying, it is mixed with raw sand that has not been chilled, and the proportion of chilled sand is 40%. Then perform ball milling in a ball mill with a ball-to-material ratio of 2:1 and a ball milling time of 10 hours to obtain the bimodal graded zircon powder of the present invention. The peak particle sizes are 7-14 μm and 109-116 μm, respectively.

[0031] figure 1 The zircon sand morphology photo after the chilling that this embodiment obtains; figure 1 It can be seen that zircon sand produces a large number of microcracks after being chilled.

[0032] figure 2 It is a particle size distribution diagram of the mixed sand obtained in this Example. Cumulative % refers to...

Embodiment 2

[0035] The raw sand used is the same as that in Example 1. The heating temperature of the chilling process is 900° C., and after being kept warm for 10 minutes, it is immersed in water and cooled to room temperature. After drying, it is mixed with unchilled raw sand, the proportion of chilled sand is 50%, and then ball milled in a ball mill with a ball-to-material ratio of 2:1 and a ball milling time of 20 hours, the bimodal gradation of the present invention can be obtained Zircon powder.

[0036] Observation and particle size analysis of the obtained zircon powder showed that the structure and particle distribution were similar to those in Example 1, and the peak particle sizes were 7-14 μm and 82-89 μm, respectively.

[0037] Figure 4 This is the morphology photo of the zircon sand after chilling obtained in this example.

[0038] Figure 5 It is a particle size distribution diagram of the mixed sand obtained in this Example.

[0039] Figure 6 It is a particle size d...

Embodiment 3

[0041] The raw sand used is the same as that in Example 1. The heating temperature of the chilling process is 800° C., and after being kept warm for 20 minutes, it is immersed in 5% brine and cooled to room temperature. After drying, it is mixed with unchilled raw sand, the proportion of chilled sand is 60%, and then ball milled in a ball mill with a ball-to-material ratio of 2:1 and a ball milling time of 14 hours, the bimodal graded zirconium of the present invention can be obtained English powder.

[0042] Observation and particle size analysis of the obtained zircon powder showed that the structure and particle distribution were similar to those in Example 1, and the peak particle sizes were 7-14 μm and 103-109 μm, respectively.

[0043] Figure 7 This is the morphology photo of the zircon sand after chilling obtained in this example.

[0044] Figure 8 It is a particle size distribution diagram of the mixed sand obtained in this Example.

[0045] Figure 9 It is a pa...

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Abstract

The invention relates to the technical field of preparation of bimodal concrete gradation powder and particularly relates to a preparation method of bimodal concrete gradation zirconium powder. The method comprises the following steps of heating zircon serving as raw sand, carrying out rapid cryogenic treatment to form a large number of micro cracks in the raw sand so as to increase the crushing speed of the raw sand in a ball milling process, and mixing the raw sand with raw sand free of rapid cryogenic treatment and carrying out ball milling treatment to obtain the zirconium powder with bimodal particle size distribution. According to the preparation method of the bimodal gradation zirconium powder, the peak particle size of the fine bimodal gradation zirconium powder is 7 micrometers to14 micrometers, and the peak particle size of the coarse bimodal gradation zirconium powder can be controlled by adjusting a raw sand particle size and ball milling time; and meanwhile, the process is simple, a conventional heating furnace and a conventional ball mill are required, the investment is small, the production cost is low, and the bimodal gradation powder suitable for different conditions can be obtained through raw sand and the control of process parameters.

Description

technical field [0001] The invention relates to the technical field of bimodal gradation powder preparation, in particular to a preparation method of bimodal gradation zircon powder. Background technique [0002] Zircon sand has excellent characteristics such as good chemical stability, high temperature resistance, low linear expansion coefficient, and good corrosion resistance, so it is widely used in precision casting, advanced ceramics, refractory coatings and wear-resistant additives for light alloys. However, the original zircon sand has a relatively large particle size and needs to be ground into a powder with a small particle size before it can be used. [0003] Investment casting is the main field of application of zircon powder. In this process, the preparation of surface coating slurry with high solid content, low apparent viscosity and stable performance is one of the key links. Low-viscosity paint slurry can accurately replicate the surface conditions of the wax...

Claims

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Application Information

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IPC IPC(8): B22C5/04
CPCB22C5/04
Inventor 秦学政邱占疆秦学红苑少强杨跃辉
Owner 江苏铸友锆钛科技有限公司
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