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Mixing technology for lead, boron and polyethylene

A technology of lead-boron polyethylene and polyethylene, which is applied in the field of mixing steps of radioactive shielding materials, can solve the problems of high labor intensity, pollution, and lead particle inclusion, and achieve the effects of good uniformity, pollution reduction, and labor intensity reduction

Inactive Publication Date: 2004-06-16
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this process is an open manual operation, with high labor intensity and serious pollution, especially the lead vapor is poisonous to the human body, and the product is prone to problems of poor chemical composition of boron carbide and inclusion of lead particles, such as lead particle inclusions as high as 5 to 30wt%. , the maximum particle size of lead particles is 2~3mm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1. Put lead powder accounting for 80% of the total weight and boron carbide powder accounting for 1% of the total weight in a conical mixer and mix for 30 minutes;

[0013] 2. Put polyethylene pellets accounting for 19% of the total weight into a thermomixer, and stir for 10 minutes at a speed of 1430 rpm;

[0014] 3. Switch the heat mixer to 700 rpm, and add the uniformly mixed lead powder and boron carbide powder mixture into the heat mixer and stir together with polyethylene pellets for 5 minutes;

[0015] 4. Unload the mixed material and break it after cooling.

Embodiment 2

[0017] 1. Put lead powder accounting for 70% of the total weight and boron carbide powder accounting for 4% of the total weight into a conical mixer and mix for 45 minutes;

[0018] 2. Put polyethylene pellets accounting for 26% of the total weight into a thermomixer, and stir for 20 minutes at a speed of 1430 rpm;

[0019] 3. Switch the heat mixer to 730 rpm, and add the uniformly mixed lead powder and boron carbide powder mixture into the heat mixer and stir together with polyethylene pellets for 6 minutes;

[0020] 4. Unload the mixed material and break it after cooling.

Embodiment 3

[0022] 1. Put lead powder accounting for 75% of the total weight and boron carbide powder accounting for 3% of the total weight into a conical mixer and mix for 60 minutes;

[0023] 2. Put polyethylene pellets accounting for 22% of the total weight into a thermomixer, and stir for 30 minutes at a speed of 1430 rpm;

[0024] 3. Switch the heat mixer to 750 rpm, and add the uniformly mixed lead powder and boron carbide powder mixture into the heat mixer and stir together with polyethylene pellets for 8 minutes;

[0025] 4. Unload the mixed material and break it after cooling.

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PUM

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Abstract

A process for mixing lead-boron polyethylene related to the material mixing process of radioactive masking material comprising the steps of, mixing lead and boron evenly, high speed mixing and plasticizing of polyethylene in heated mixer, and mixing the lead-boron mixture with polyethylene in heated mixer evenly. The process according to the invention realizes simple operation process, less pollution, even product mixing, thus can be widely applied into the mixing process for lead-containing material.

Description

technical field [0001] The invention relates to a mixing process of composite materials, in particular to a mixing step of radioactive shielding materials. Background technique [0002] Lead-boron polyethylene has a comprehensive shielding effect of shielding fast neutrons, thermal neutrons and gamma radiation, and is small in weight, which can simplify the shielding structure, so it is used in reactors of nuclear power plants. In the traditional mixing process of plastic industry, the high-speed kneading (banbury) process is commonly used for lead-boron polyethylene, such as "High-efficiency shielding material lead-boron polyethylene" ("Nuclear Power Engineering" V01.15 NO.4 , P370~374) The mixing process is to mix lead powder, boron carbide powder and polyethylene in a kneader at a high speed after metering and mixing, and then use a two-roller plasticizing (open refining) process to further homogenize and plasticize the mixture . [0003] However, this process is an ope...

Claims

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Application Information

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IPC IPC(8): C08K3/38C08K9/02C08L23/06
Inventor 杨勇飞邹从沛谷晓非潘学荣
Owner NUCLEAR POWER INSTITUTE OF CHINA