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A kind of preparation method of zirconium tungstate powder

A zirconium tungstate powder technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of cumbersome process and unsuitable for large-scale production, and achieve simple process, low preparation cost and low energy consumption Effect

Active Publication Date: 2022-01-21
SUZHOU GINET NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method still adopts a multi-stage calcination scheme, and the powder still needs to be taken out from the high temperature state for quenching treatment. The process is cumbersome and still not suitable for large-scale production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1: Dissolve zirconium hydroxide and pure water in pure water at a mass ratio of 1:3 to obtain solution A;

[0052] Step 2: Mix ammonium metatungstate and solution A according to the mass ratio of 1:2 to obtain solution B;

[0053] Step 3: Add 1wt% zirconium hydroxide PAAS into solution B as a flocculant, then continue to stir for 1 hour, after the stirring is completed, let the solution stand for 3 hours to allow the material to settle, and take out the sediment in the lower layer;

[0054] Step 4: Dry the sediment at 120°C, grind it, and pass it through a 60-mesh sieve to obtain substance C;

[0055] Step 5: Feed material according to the mass ratio of substance C and acid solution at 1:10, put substance C into the acid solution composed of 6wt% hydrochloric acid and 1.5wt% nitric acid, heat and stir at 40°C for 2 hours, and react After the end, carry out precipitation and let stand for 1 hour to obtain the lower precipitate, namely zirconium tungstate precursor po...

Embodiment 2

[0058] It is basically the same as Example 1, except that the acid solution in step 5 is composed of 4.5wt% hydrochloric acid and 0.5wt% nitric acid; the calcination temperature in step 6 is 650°C.

Embodiment 3

[0060] It is basically the same as Example 1, except that the acid solution in step 5 is composed of 9wt% hydrochloric acid and 1wt% nitric acid.

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PUM

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Abstract

The invention provides a preparation method of zirconium tungstate powder, the preparation method comprising: (1), a zirconium source and a tungsten source form a tungsten-zirconium gel in a solvent under the action of a flocculant; (2), the The zirconium tungstate gel is reacted with an acid solution to obtain a zirconium tungstate precursor; (3), the zirconium tungstate precursor is calcined to obtain the zirconium tungstate powder, wherein the acid solution contains at least HCl and HNO 3 , the calcination temperature is 600-800°C. The preparation method of zirconium tungstate powder provided by the present invention can prepare zirconium tungstate powder with high purity and high negative expansion coefficient, the process is relatively simple, and the energy consumption is low, so the preparation cost is low, and it is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a preparation method of zirconium tungstate powder. Background technique [0002] With the development of 5G communication technology, the use of ceramic devices in electronic equipment is gradually increasing. However, the thermal expansion coefficient of commonly used copper clad laminates is about 50% higher than that of ceramic devices. The thermal expansion coefficients of the two do not match, and thermal stress is likely to cause device failure during actual use. Therefore, it is very necessary to develop CCL filler materials with high negative expansion coefficient to reduce the thermal expansion coefficient of CCL. [0003] Zirconium tungstate has a high negative expansion coefficient in the range of -270°C to 776°C (less than -9×10 -6 / °C), while having high insulation and excellent acid resistance, it is very suitable as a filler to reduce th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00
CPCC01G41/00
Inventor 王德彬沈晓燕胡林政
Owner SUZHOU GINET NEW MATERIAL TECH CO LTD