发明名称 |
Method of dusting-preventive treatment of powder having dusting property |
摘要 |
A method of dusting-preventive treatment in which a powder having dusting property is treated with fibril-forming PTFE (polytetrafluoroethylene) to impart non-dusting property thereto and the non-dusting property of the powder, after having been reduced during transportation, are economically and advantageously recovered or improved through a relatively simple step. The method comprises: a first dusting-preventive treatment step in which fibril-forming polytetrafluoroethylene is added to a powder having dusting property, and a compression/shear force is exerted to the mixture at a temperature in the range of 20 to 200 DEG C to thereby regulate powder so as to have a flow value of 150 mm to 200 mm; and a second dusting-preventive treatment step in which a compression/shear force is exerted again at a temperature in the range of 50 to 150 DEG C, without newly adding fibril-forming polytetrafluoroethylene, to the resultant powder after the powder treated in the first step has deteriorated in dusting-preventive property during transportation with transporting means due to such an external force that the polytetrafluoroethylene fibrils partly cleave or powder particles partly fall off polytetrafluoroethylene fibril nets. |
申请公布号 |
AU6789501(A) |
申请公布日期 |
2002.03.04 |
申请号 |
AU20010067895 |
申请日期 |
2001.07.02 |
申请人 |
ASO CEMENT CO., LTD.;MURAKASHI LIME INDUSTRY CO., LTD.;NIPPON HODO CO., LTD.;DUPONT-MITSUI FLUOROCHEMICALS CO., LTD. |
发明人 |
HIROHUMI TSUTSUMI;TERUO URANO;MASATSUNE OGURA;TETSUYA SHIMODA |
分类号 |
C04B7/52;C04B24/26;C09K3/22 |
主分类号 |
C04B7/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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