Method for producing sodium tungstate, method for collecting tungsten, apparatus for producing sodium tungstate, and method for producing sodium tungstate aqueous solution
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United States of America Patent
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Dec 6, 2016
Grant Date -
May 1, 2014
app pub date -
Dec 23, 2013
filing date -
Mar 11, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Provided are a method for producing sodium tungstate by supplying an oxidant made of sodium nitrate or sodium nitrite to bring a tungsten containing material and the oxidant into contact with each other in an atmosphere containing oxygen to thereby continuously produce a reaction product; a method for collecting tungsten using the method; and an apparatus for producing sodium tungstate. Also provided are a method for producing a sodium tungstate aqueous solution in which a reductant is introduced into a melt containing the above-described reaction product which is then dissolved in water; and a method for collecting tungsten using the method.
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International Classification(s)
- 2013 Application Filing Year
- C22B Class
- 312 Applications Filed
- 280 Patents Issued To-Date
- 89.75 % Issued To-Date
Cited Art Landscape
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- 0 Citation Count
- C22B Class
- 0 % this patent is cited more than
- 9 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jun 6, 2028 |
