Self-propagating high-temperature synthesis and densification method of zirconolite-rich type man-made rock

A self-propagating high-temperature, artificial rock technology, applied in the field of artificial rock preparation, can solve the problems of poor practicability, high synthesis temperature, and long synthesis cycle, and achieve the effects of large storage capacity, high product density, and good stability

Inactive Publication Date: 2014-08-20
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is more suitable for engineering application to prepare perovskite-rich zircon-type artificial rock solidified body by solid-phase method, but the existing sol...

Method used

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  • Self-propagating high-temperature synthesis and densification method of zirconolite-rich type man-made rock
  • Self-propagating high-temperature synthesis and densification method of zirconolite-rich type man-made rock
  • Self-propagating high-temperature synthesis and densification method of zirconolite-rich type man-made rock

Examples

Experimental program
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Embodiment 1

[0039] A method for self-propagating high-temperature synthesis and densification of perovskite-rich zircon-type artificial rocks, comprising the following steps:

[0040] (1) The raw material is treated with Ca(NO 3 ) 2 .4H 2 O: 41.3%, CaO: 3%, ZrO 2 : 24.5%, Ti: 8.4%, TiO 2 : 23.2%, BaO: 1.5%, Al 2 o 3 : 1% mass percentage is taken and mixed evenly;

[0041] (2) Grind the uniformly mixed raw material for 20 minutes and pass through a 100-mesh sieve, take 30 g of fully ground raw material and put it into a steel mold, and cold press it under a pressure of 50 MPa to obtain a cylindrical blank with a diameter of 30 mm and a thickness of about 5 mm;

[0042] (3) Self-propagating high-temperature synthetic artificial rock: a self-propagating quasi-isostatic pressure device is used. The composition of the device includes a thermocouple 5, an ignition tungsten wire 6, and a steel plate composed of a bottom 1, an annular side wall 2 and an upper pressure head 3. mold; see att...

Embodiment 2

[0044] A method for self-propagating high-temperature synthesis and densification of perovskite-rich zircon-type artificial rocks, comprising the following steps:

[0045] (1) The raw material is treated with Ca(NO 3 ) 2 .4H 2 O: 46.2%, CaO: 4.7%, ZrO 2 : 26.9%, Ti: 7.6%, TiO 2 : 26.9%, BaO: 2.4%, Al 2 o 3 : 1.6% of the mass percentage is taken and mixed uniformly;

[0046] (2) Grind the uniformly mixed raw materials for 20 minutes and pass through a 100-mesh sieve, take 30 g of fully ground raw materials, put them into a steel mold, and cold press them under a pressure of 50 MPa to obtain a cylindrical blank with a diameter of 30 mm and a thickness of about 4.8 mm ;

[0047] (3) Self-propagating high-temperature synthetic artificial rock: a self-propagating quasi-isostatic pressure device is used. The composition of the device includes a thermocouple 5, an ignition tungsten wire 6, and a steel plate composed of a bottom 1, an annular side wall 2 and an upper pressure h...

Embodiment 3

[0049] A method for self-propagating high-temperature synthesis and densification of perovskite-rich zircon-type artificial rocks, comprising the following steps:

[0050] (1) Ingredients of raw materials:: mix raw materials with Ca(NO 3 ) 2 .4H 2 O: 42.8%, CaO: 1.5%, ZrO 2 : 22.3%, Ti: 8.7%, TiO 2 : 22.6%, BaO: 1.5%, Al 2 o 3: 0.5% of the mass percent example is taken and mixed uniformly;

[0051] (2) Grind the uniformly mixed raw materials for 30 minutes and pass through a 150-mesh sieve, take 25 g of fully ground raw materials and put them into a steel mold, and cold-press them under a pressure of 20 MPa to obtain a cylindrical blank with a diameter of 30 mm and a thickness of about 4.6 mm ;

[0052] (3) Using self-propagating high-temperature synthetic artificial rock: adopting self-propagating quasi-isostatic pressure device, the composition of the device includes thermocouple 5, ignition tungsten wire 6, and the bottom 1, annular side wall 2 and upper pressure hea...

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Abstract

The invention discloses a self-propagating high-temperature synthesis and densification method of a zirconolite-rich type man-made rock. The method is characterized by comprising the steps of performing mixing, ball milling and screening on raw materials such as calcium nitrate tetrahydrate, calcium oxide, zirconium dioxide, titanium powder, titanium dioxide, barium oxide, aluminum oxide and the like to obtain a mixed material; putting the mixed material into a mold, and pressing to obtain a blank; preparing the blank into the densified zirconolite-rich type man-made rock by using a self-propagating pseudo isostatic pressing device. By adopting the self-propagating high-temperature synthesis and densification method, the prepared irconolite-rich type man-made rock has relatively large capacity on rare earth elements, actinide elements and the like, and is wide in element containment range. The self-propagating high-temperature synthesis and densification method disclosed by the invention adopts a high-temperature self-propagating synthetic method, is high in synthesis speed, short in production cycle and high in production efficiency, does not need a heat source provided externally, and is simple in process and strong in practicability; the prepared zirconolite-rich type man-made rock is suitable for solidification treatment of radioactive wastes.

Description

technical field [0001] The invention belongs to the preparation of artificial rocks, and relates to a method for self-propagating high-temperature synthesis and densification of perovskite-rich zircon artificial rocks. The perovskite-zircon-rich artificial rock prepared by the present invention is especially suitable for the treatment of high-level radioactive waste; the perovskite-zircon artificial rock is the main parasitic phase of actinide elements, and it also has good tolerance for rare earth elements. High-level radioactive waste has good development prospects. Background technique [0002] Self-propagating high-temperature synthesis (abbreviated as SHS) technology (that is, the preparation method using self-propagating quasi-isostatic pressing device) is an important material preparation technology. Product of specified composition and structure. Compared with traditional technology, SHS technology has the advantages of fast response, low energy consumption, simple...

Claims

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Application Information

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IPC IPC(8): C04B30/00
Inventor 张魁宝文冠军李玉香滕元成
Owner SOUTHWEAT UNIV OF SCI & TECH
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