CN103386398B

CN103386398B - The method for separating of uranium dioxide core microballoon and device

Info

Publication number: CN103386398B
Application number: CN201310306478.2A
Authority: CN
Inventors: 赵兴宇; 王阳; 郝少昌; 马景陶; 邓长生; 周湘文; 刘兵; 唐亚平
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2013-07-19
Filing date: 2013-07-19
Publication date: 2016-03-30
Anticipated expiration: 2033-07-19
Also published as: CN103386398A

Abstract

The invention discloses a kind of method for separating for uranium dioxide core microballoon, comprise following steps: coarse sizing, preliminary screening is carried out to uranium dioxide core microballoon; To shake choosing, the uranium dioxide core microballoon through coarse sizing is shaken and selects the bad lopsided particle of sphericity; Fine screening, carefully analyses sieve to through the uranium dioxide core microballoon that select, good sphericity that shakes; Ratio mixes, and mixes in proportion the uranium dioxide core microballoon through fine screening.Meanwhile, the invention also discloses a kind of sorting unit for uranium dioxide core microballoon, comprise with lower module: coarse sizing module, preliminary screening is carried out to uranium dioxide core microballoon; Shake modeling block, shakes select the bad lopsided particle of sphericity to the uranium dioxide core microballoon through coarse sizing; Fine screening module, carefully analyses sieve to through the uranium dioxide core microballoon that select, good sphericity that shakes; Ratio mixing module, mixes in proportion to the uranium dioxide core microballoon through fine screening.

Description

The method for separating of uranium dioxide core microballoon and device

Technical field

The present invention relates to microballoon material sieving technology field, particularly a kind of method for separating of uranium dioxide core microballoon.

Background technology

After the eighties in 20th century, the HTGR that various countries' design, construction and plan are built all uses TRISO type coated fuel particles, and its center is generally the uranium dioxide core of low enrichment, is prepared by sol-gel process.One of most important functions of coated particle stops fission product.This just directly requires that coated particle has uniform coating thickness and good sphericity, correspondingly requires that coated core core has uniform diameter and good sphericity.Therefore, the selection of diameter and sphericity has become one of research topic important in uranium dioxide core preparation technology and equipment research.

The method of current screening uranium dioxide core microballoon is for first to screen, then choosing of shaking, or choosing of first shaking, and then screens, or use is manually screened.

Particle lopsided in uranium dioxide core microballoon and chip easily stick on screen cloth by the method for first screening choosing of shaking afterwards, and then are mixed in finished product.First to shake choosing, and then the uranium dioxide core microballoon blocking that easily makes diameter larger of the method for screening is shaken and is selected machine feed pipe.Artificial screening cost is high, and uranium dioxide core microballoon is with radiation, has injury to human body.

Summary of the invention

(1) technical problem that will solve

To the object of the invention is to solve in traditional uranium dioxide core microballoon method for separating in urania core core microballoon lopsided particle and chip sticks on screen cloth or the blocking of uranium dioxide core microballoon is shaken selects the problem of machine feed pipe.

(2) technical scheme

The present invention adopts following technical scheme:

For a method for separating for uranium dioxide core microballoon, comprise following steps:

1) coarse sizing, carries out preliminary screening to uranium dioxide core microballoon;

2) to shake choosing, the uranium dioxide core microballoon through coarse sizing is shaken and selects the bad lopsided particle of sphericity;

3) fine screening, carefully analyses sieve to through the uranium dioxide core microballoon that select, good sphericity that shakes through the screen cloth being no less than 2 layers;

4) ratio mixing, mixes in proportion to the uranium dioxide core microballoon through fine screening.

Preferably, described coarse sizing method is filter out the uranium dioxide core microballoon that diameter is greater than 1 millimeter.

Preferably, described choosing amount of shaking is 90-100 gram per hour.

Preferably, described fine screening feeding quantity is each 100-150 gram.

Further, described fine screening each time is 5 minutes.

Preferably, described fine screen mesh is 3 layers of screening net.

Further, the screening screen distance of 3 layers of described standard screen network selection is descending to be arranged in order from top to bottom.

Further, the bore of 3 layers of described standard screen network selection is followed successively by 560 μm, 500 μm, 450 μm from top to bottom.

Preferably, mixing uranium dioxide core microballoon is in proportion the uranium dioxide core microballoon that mixing fine screening descends in two layer screen network selection on the net most.

For a sorting unit for uranium dioxide core microballoon, comprise with lower module:

1) coarse sizing module, carries out preliminary screening to uranium dioxide core microballoon;

2) shake modeling block, shakes select the bad lopsided particle of sphericity to the uranium dioxide core microballoon through coarse sizing;

3) fine screening module, carefully analyses sieve to through the uranium dioxide core microballoon that select, good sphericity that shakes through the screen cloth being no less than 2 layers;

4) ratio mixing module, mixes in proportion to the uranium dioxide core microballoon through fine screening.

(3) beneficial effect

The present invention adopts first coarse sizing, in choosing of shaking, and then the method for fine screening, can to reduce in urania core core microballoon lopsided particle and chip sticks on screen cloth or the blocking of uranium dioxide core microballoon is shaken selects the probability of machine feed pipe during the sorting of uranium dioxide core microballoon.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of a kind of uranium dioxide core microballoon method for separating of the present invention;

Fig. 2 is the schematic diagram of a kind of uranium dioxide core microballoon sorting unit of the present invention;

Detailed description of the invention

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described further.Following examples only for illustration of the present invention, but are not used for limiting the scope of the invention.

The schematic diagram of the schematic diagram of a kind of uranium dioxide core microballoon method for separating as shown in Figure 1 and a kind of uranium dioxide core microballoon sorting unit as shown in Figure 2, the present invention adopts method as shown in Figure 1 and the device shown in Fig. 2 to carry out the explanation of uranium dioxide core microballoon sorting.

First the uranium dioxide core microballoon after high temperature sintering is added coarse sizing module as shown in Figure 2, the aperture of scalping network selection is set to 1mm, cross the standard analysis sieve that aperture is 1mm, filter out diameter be greater than the uranium dioxide core microballoon of 1mm and weigh, uranium dioxide core microballoon diameter being less than 1mm collects and weighs.

The uranium dioxide core microballoon whole diameter being less than 1mm is put into shake and is selected machine module, select machine to shake through shaking and select the bad lopsided particle of sphericity, shake and select capability control to be 90-100g per hour, the uranium dioxide core microballoon of good sphericity and the bad uranium dioxide core microballoon of sphericity are collected respectively and weighed.

The uranium dioxide core microballoon of good sphericity is put into fine screening module.Through three layers of standard sub-sieve, mesh size reduces from top to bottom successively, be followed successively by the aperture screen cloth that employing diameter is 560 μm, 500 μm, 450 μm from top to bottom, feeding quantity controls as each 100 ~ 150g, it is 5 minutes that each screening time controls, and after each screening terminates, the particle on each layer screen cloth is collected respectively and is weighed.

Particle online for the aperture sieve of all 500 μm and 450 μm is put into batch mixing module in proportion and carries out Homogeneous phase mixing, weigh after mixing stand-by, and sampling detects.

All diameters be greater than 1mm, deformity, uranium dioxide core microballoon that diameter is less than 450 μm is all recovered as rejected particles.

Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification, therefore all equivalent technical schemes also belong to protection category of the present invention.

Claims

1. for a method for separating for uranium dioxide core microballoon, it is characterized in that, described method for separating comprises following steps:

3) fine screening, to through choosing of shaking, the uranium dioxide core microballoon of good sphericity carefully analyses sieve through the screening net of 3 layers;

4) ratio mixing, mixes in proportion to the uranium dioxide core microballoon through fine screening;

Wherein, described step 1) coarse sizing method be filter out the uranium dioxide core microballoon that diameter is greater than 1 millimeter;

Wherein, described step 2) in choosing amount of shaking be 90-100 gram per hour;

Wherein, described step 3) in fine screening feeding quantity be each 100-150 gram;

Wherein, described fine screening each time is 5 minutes;

Wherein, described step 4) in mix uranium dioxide core microballoon be in proportion that uranium dioxide core microballoon in two layer screen network selection is descended in mixing fine screening on the net most.

2. the method for separating of uranium dioxide core microballoon according to claim 1, is characterized in that, the screening screen distance of the screening net of described 3 layers is descending to be arranged in order from top to bottom.

3. the method for separating of uranium dioxide core microballoon according to claim 2, is characterized in that, the bore of the screening net of described 3 layers is followed successively by 560 μm, 500 μm, 450 μm from top to bottom.

4. for a sorting unit for uranium dioxide core microballoon, it is characterized in that, described device comprises with lower module:

1) coarse sizing module, goes out for Preliminary screening the uranium dioxide core microballoon that diameter is greater than 1mm and carries out;

2) shake modeling block, the uranium dioxide core microballoon through coarse sizing carried out to the choosing of shaking of 90-100 per hour gram, to select the bad lopsided particle of sphericity;

3) fine screening module, comprises 3 layers of dusting cover network selection, and feeding quantity is each 100-150 gram, for through choosing of shaking, the uranium dioxide core microballoon of good sphericity carry out each 5 minutes carefully analyse sieve;

4) ratio mixing module, mixes in proportion to descending most the uranium dioxide core microballoon that two layer screen network selection is screened on the net through fine screening.