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1. 发明公开

EP1281670A1 Fine tungsten carbide powder and process for producing the same 有权
标题翻译： Feines Wolframcarbidpulver und Verfahren zu dessen Herstellung
公开(公告)号：EP1281670A1
公开(公告)日：2003-02-05
申请号：EP02002078.0
申请日：2002-02-11
申请人： MITSUBISHI MATERIALS CORPORATION , Japan New Metals Co., Ltd.
发明人： Yaginuma, Hiroshi , Morita, Susumu
IPC分类号： C01B31/34
CPC分类号： C01B32/949 , C01P2002/77 , C01P2004/62 , C01P2006/12 , C01P2006/80
摘要： A process is provided for producing a fine tungsten carbide powder, which comprises the steps of drying a slurry, which is obtained by mixing an aqueous ammonium tungstate solution with a carbon powder, at low temperature, to form a precursor, mixing a reduced and carburized product, which is obtained by reducing and oxidizing the precursor in a non-oxidizing gas, with a carbon powder in a proportion required to substantially carburize the entire tungsten component into tungsten carbide (WC), and carburizing the mixture; and a high-performance fine tungsten carbide powder produced by the process, which has an average particle size of 0.8 µm or less and is free of a coarse power having a particle size of more than 1 µm, and which also contains less metal impurities and contains oxygen and nitrogen in a predetermined amount.
摘要翻译：提供了一种生产精细碳化钨粉末的方法，其包括以下步骤：在低温下将钨酸铵水溶液与碳粉末混合而获得的浆料干燥以形成前体，混合还原和渗碳产品，其通过以非氧化性气体中的前体还原和氧化得到的碳粉末以使整个钨组分基本上渗碳到碳化钨（WC）中所需的比例并将该混合物渗碳得到; 以及平均粒径为0.8μm以下并且不具有粒径大于1μm的粗大功率，并且还含有较少金属的该方法生产的高性能微细碳化钨粉末杂质并含有预定量的氧和氮。

2. 发明公开

EP2484463A1 METHOD FOR PRODUCING HIGH-PURITY TUNGSTEN POWDER 有权转让
标题翻译： VERFAHREN ZUR HERSTELLUNG VON HOCHREINEM WOLFRAMPULVER
公开(公告)号：EP2484463A1
公开(公告)日：2012-08-08
申请号：EP10820515.4
申请日：2010-09-28
申请人： JX Nippon Mining & Metals Corporation , Japan New Metals Co., Ltd.
发明人： SATO Jin , TAKEMOTO Kouichi , SASAKI Takeshi , OHNO Mikio , OGURA Junji
IPC分类号： B22F1/00 , B22F9/22 , C22C27/04
CPC分类号： B22F9/22 , B22F2201/013 , C22C27/04
摘要： [Abstract] Provided is a method for producing a high-purity tungsten powder having a phosphorus content of less than 1 wtppm; wherein an ammonium tungstate solution containing 1 wtppm or more of phosphorus as an impurity in terms of the inclusion in tungsten is used as a starting material, this solution is neutralized with hydrochloric acid at a temperature of 50°C or less to adjust the pH at 4 or more and less than 7 so as to precipitate ammonium paratungstate undecahydrate crystals, the resulting solution is heated to 70 to 90°C and filtered in a high-temperature state so as to obtain ammonium paratungstate pentahydrate crystals, the obtained crystals are calcined so as to form a tungsten oxide, and the tungsten oxide is subject to hydrogen reduction so as to obtain a high-purity tungsten powder. Additionally provided is a method for producing a high-purity tungsten powder having a phosphorus content of 0.4 wtppm or less; wherein the ammonium tungstate solution is neutralized with hydrochloric acid to adjust the pH at 4 or more and 6 or less, and this solution is subject to the same procedure as described above so as to obtain a high-purity tungsten powder. Consequently, the phosphorus content can be efficiently reduced.
摘要翻译： [摘要]提供磷含量小于1重量ppm的高纯度钨粉的制造方法，其中以钨含量计含有1重量ppm以上的磷作为杂质的钨酸钨溶液作为起始原料，在50℃以下的温度下用盐酸中和该溶液，调节pH为 4以上且小于7以便使仲钨酸铵十一水合物晶体析出，将所得溶液加热至70〜90℃，并在高温状态下过滤，得到仲钨酸铵五水合物晶体，将所得晶体煅烧以形成氧化钨，氧化钨进行氢还原，得到高纯度的钨粉末。另外提供了磷含量为0.4重量ppm以下的高纯度钨粉的制造方法，其中钨酸铵溶液用盐酸中和以将pH调节至4以上且6以下，并且将该溶液进行与上述相同的程序，以获得高纯度的钨粉末。因此，可以有效地降低磷含量。

3. 发明授权

EP1281670B1 Fine tungsten carbide powder and process for producing the same 有权
标题翻译：细碳化钨粉和工艺及其制备方法
公开(公告)号：EP1281670B1
公开(公告)日：2007-11-14
申请号：EP02002078.0
申请日：2002-02-11
申请人： MITSUBISHI MATERIALS CORPORATION , Japan New Metals Co., Ltd.
发明人： Yaginuma, Hiroshi , Morita, Susumu
IPC分类号： C01B31/34
CPC分类号： C01B32/949 , C01P2002/77 , C01P2004/62 , C01P2006/12 , C01P2006/80
摘要： A process is provided for producing a fine tungsten carbide powder, which comprises the steps of drying a slurry, which is obtained by mixing an aqueous ammonium tungstate solution with a carbon powder, at low temperature, to form a precursor, mixing a reduced and carburized product, which is obtained by reducing and oxidizing the precursor in a non-oxidizing gas, with a carbon powder in a proportion required to substantially carburize the entire tungsten component into tungsten carbide (WC), and carburizing the mixture; and a high-performance fine tungsten carbide powder produced by the process, which has an average particle size of 0.8 mu m or less and is free of a coarse power having a particle size of more than 1 mu m, and which also contains less metal impurities and contains oxygen and nitrogen in a predetermined amount.

4. 发明公开

EP3933058A1 TUNGSTEN RECOVERY METHOD 审中-公开
公开(公告)号：EP3933058A1
公开(公告)日：2022-01-05
申请号：EP20762479.2
申请日：2020-01-15
申请人： Mitsubishi Materials Corporation , Japan New Metals Co., Ltd.
发明人： HARAGUCHI Daisuke , ABE Junji , NAGAI Yuuki
IPC分类号： C22B7/00 , C22B34/36 , C22B3/12
摘要： A tungsten recovery method including leaching tungsten while suppressing leaching of silicon by using a weak alkali compound with respect to a tungsten raw material containing silicon with tungsten oxide, separating most of the silicon as a residue during the leaching of the tungsten, and recovering a tungsten leachate having an extremely low silicon concentration.

5. 发明公开

EP3480328A1 SUPER HARD SINTERED BODY 有权转让
公开(公告)号：EP3480328A1
公开(公告)日：2019-05-08
申请号：EP17820231.3
申请日：2017-06-28
申请人： Mitsubishi Materials Corporation , Japan New Metals Co., Ltd.
发明人： NISHIYAMA Akio , YANO Masahiro , MORITA Susumu
IPC分类号： C22C29/08 , B23B27/14 , C22C1/05
摘要： Provided is a super-hard sintered material which contains 5 to 55 mass% of W and a WC balance containing inevitable impurities and is excellent in high hardness and high strength.

6. 发明授权

EP2484463B1 METHOD FOR PRODUCING HIGH-PURITY TUNGSTEN POWDER 有权转让
标题翻译：生产高纯度钨粉的方法
公开(公告)号：EP2484463B1
公开(公告)日：2018-05-16
申请号：EP10820515.4
申请日：2010-09-28
申请人： JX Nippon Mining & Metals Corporation , Japan New Metals Co., Ltd.
发明人： SATO Jin , TAKEMOTO Kouichi , SASAKI Takeshi , OHNO Mikio , OGURA Junji
IPC分类号： B22F1/00 , B22F9/22 , C22C27/04
CPC分类号： B22F9/22 , B22F2201/013 , C22C27/04
摘要： [Abstract] Provided is a method for producing a high-purity tungsten powder having a phosphorus content of less than 1 wtppm; wherein an ammonium tungstate solution containing 1 wtppm or more of phosphorus as an impurity in terms of the inclusion in tungsten is used as a starting material, this solution is neutralized with hydrochloric acid at a temperature of 50°C or less to adjust the pH at 4 or more and less than 7 so as to precipitate ammonium paratungstate undecahydrate crystals, the resulting solution is heated to 70 to 90°C and filtered in a high-temperature state so as to obtain ammonium paratungstate pentahydrate crystals, the obtained crystals are calcined so as to form a tungsten oxide, and the tungsten oxide is subject to hydrogen reduction so as to obtain a high-purity tungsten powder. Additionally provided is a method for producing a high-purity tungsten powder having a phosphorus content of 0.4 wtppm or less; wherein the ammonium tungstate solution is neutralized with hydrochloric acid to adjust the pH at 4 or more and 6 or less, and this solution is subject to the same procedure as described above so as to obtain a high-purity tungsten powder. Consequently, the phosphorus content can be efficiently reduced.

7. 发明公开

EP2484463A4 METHOD FOR PRODUCING HIGH-PURITY TUNGSTEN POWDER 有权转让
标题翻译：工艺生产高纯度钨粉
公开(公告)号：EP2484463A4
公开(公告)日：2014-02-05
申请号：EP10820515
申请日：2010-09-28
申请人： JX NIPPON MINING & METALS CORP , JAPAN NEW METALS CO LTD
发明人： SATO JIN , TAKEMOTO KOUICHI , SASAKI TAKESHI , OHNO MIKIO , OGURA JUNJI
IPC分类号： B22F1/00 , B22F9/22 , C22C27/04
CPC分类号： B22F9/22 , B22F2201/013 , C22C27/04
摘要： [Abstract] Provided is a method for producing a high-purity tungsten powder having a phosphorus content of less than 1 wtppm; wherein an ammonium tungstate solution containing 1 wtppm or more of phosphorus as an impurity in terms of the inclusion in tungsten is used as a starting material, this solution is neutralized with hydrochloric acid at a temperature of 50°C or less to adjust the pH at 4 or more and less than 7 so as to precipitate ammonium paratungstate undecahydrate crystals, the resulting solution is heated to 70 to 90°C and filtered in a high-temperature state so as to obtain ammonium paratungstate pentahydrate crystals, the obtained crystals are calcined so as to form a tungsten oxide, and the tungsten oxide is subject to hydrogen reduction so as to obtain a high-purity tungsten powder. Additionally provided is a method for producing a high-purity tungsten powder having a phosphorus content of 0.4 wtppm or less; wherein the ammonium tungstate solution is neutralized with hydrochloric acid to adjust the pH at 4 or more and 6 or less, and this solution is subject to the same procedure as described above so as to obtain a high-purity tungsten powder. Consequently, the phosphorus content can be efficiently reduced.

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