Preparation of ammonium paratungstate from a sodium tungstate-sodium chloride phase

Raddatz, A. E. (Andrea E.); Gomes, J. M. (John M.); Carnahan, T. G. (Thomas G.)

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Preparation of ammonium paratungstate from a sodium tungstate-sodium chloride phase

1988
By Raddatz, A. E. (Andrea E.) ; Gomes, J. M. (John M.) ; Carnahan, T. G. (Thomas G.)
Series: Report of investigations (United States. Bureau of Mines) ; 9165

[PDF-643.66 KB]

English

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Personal Author:

Raddatz, A. E. (Andrea E.) ; Gomes, J. M. (John M.) ; Carnahan, T. G. (Thomas G.)

Raddatz, A. E. (Andrea E.) ; Gomes, J. M. (John M.) ; Carnahan, T. G. (Thomas G.) Less -
Corporate Authors:

United States. Bureau of Mines.
Description:

"Previous Bureau of Mines research has shown that tungsten ores containing as little as 40 pct (wo3)2- can be processed by a high- temperature molten-salt extraction technique to produce a tungstate- bearing sodium chloride phase with 99 pct w recovery and little impurity contamination. The objective of this work was to demonstrate that the tungstate-bearing sodium chloride phase can be a suitable feed material for preparing ammonium paratungstate (apt) by a modification to the present industrial solvent extraction process. A combined crossflow-countercurrent flow solvent extraction technique to extract tungsten is presented. Apt produced by this new technique contained 88.6 pct (wo3)2- and the following impurities, in percent: mNO2, 0.0007; Moo2, 0.017; P2o5, <0.010; and sio2, 0.012. Implementation of this processing technique would improve tungsten recovery from concentrates and simplify processing operations." - NIOSHTIC-2

NIOSH no. 10006039
Subjects:

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Ammonium Paratungstate. Solvent Extraction. Tungsten -- Metallurgy.
Series:

Report of investigations (United States. Bureau of Mines) ; 9165
Document Type:

Report
NIOSHTIC Number:

10006039
Collection(s):

Stephen B. Thacker CDC Library collection
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urn:sha-512:00c02c89b3289541db1e7b62f90c3f505f4a529876696bd2d8b07964b3c916ddfe5f5050c6232972ef7f8a08f23edc4d660f7ecfdf4e1900adfa38290da48e92
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https://stacks.cdc.gov/view/cdc/10634/cdc_10634_DS1.pdf
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Preparation of ammonium paratungstate from a sodium tungstate-sodium chloride phase

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