Process for the recovery of cobalt and tungstic acid and/or its derivatives from aqueous solutions
US-10450631-B2 · Oct 22, 2019 · US
Tungsten recovery method
US2022136082A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022136082-A1 |
| Application number | US-202017431296-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jan 15, 2020 |
| Priority date | Feb 25, 2019 |
| Publication date | May 5, 2022 |
| Grant date | — |
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Abstract
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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.
First claim
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1 . A tungsten recovery method comprising leaching tungsten while suppressing leaching of silicon by weak alkali leaching using a weak alkali compound with respect to a tungsten raw material containing silicon and tungsten oxide. 2 . The tungsten recovery method according to claim 1 , wherein the weak alkali compound is sodium carbonate, aqueous ammonia, or sodium phosphate. 3 . The tungsten recovery method according to claim 1 , wherein the weak alkali compound having a molar equivalent of 1.5 to 3.0 times an amount of tungsten oxide in the raw material is added to the tungsten raw material to leach tungsten. 4 . The tungsten recovery method according to claim 1 , wherein the tungsten raw material is an oxidized roasted product of tungsten sludge containing tungsten carbide and silicon. 5 . The tungsten recovery method according to claim 4 , wherein the tungsten sludge is an oxidized roasted product containing 25 to 35 wt % of WO 3 , 15 to 20 wt % of CoWO 4 , and 25 to 50 wt % of SiO 2 . 6 . The tungsten recovery method according to claim 2 , wherein the weak alkali compound having a molar equivalent of 1.5 to 3.0 times an amount of tungsten oxide in the raw material is added to the tungsten raw material to leach tungsten. 7 . The tungsten recovery method according to claim 2 , wherein the tungsten raw material is an oxidized roasted product of tungsten sludge containing tungsten carbide and silicon. 8 . The tungsten recovery method according to claim 3 , wherein the tungsten raw material is an oxidized roasted product of tungsten sludge containing tungsten carbide and silicon. 9 . The tungsten recovery method according to claim 6 , wherein the tungsten raw material is an oxidized roasted product of tungsten sludge containing tungsten carbide and silicon. 10 . The tungsten recovery method according to claim 7 , wherein the tungsten sludge is an oxidized roasted product containing 25 to 35 wt % of WO 3 , 15 to 20 wt % of CoWO 4 , and 25 to 50 wt % of SiO 2 . 11 . The tungsten recovery method according to claim 8 , wherein the tungsten sludge is an oxidized roasted product containing 25 to 35 wt % of WO 3 , 15 to 20 wt % of CoWO 4 , and 25 to 50 wt % of SiO 2 . 12 . The tungsten recovery method according to claim 9 , wherein the tungsten sludge is an oxidized roasted product containing 25 to 35 wt % of WO 3 , 15 to 20 wt % of CoWO 4 , and 25 to 50 wt % of SiO 2 .
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Classifications
Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; {Methods of a general interest or applied to the winning of more than two metals (briquetting of scrap C22B1/248; preliminary treatment of scrap C22B1/005)} · CPC title
Recycling · CPC title
in inorganic alkaline solutions · CPC title
- C22B34/36Primary
Obtaining tungsten · CPC title
Heavy metals or heavy metal compounds · CPC title
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- What does patent US2022136082A1 cover?
- 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.
- Who is the assignee on this patent?
- Mitsubishi Materials Corp, Japan New Metals Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C22B34/36. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu May 05 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).