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Method of reclaiming tantalum-niobium smelt diluting salt

A recovery method, the technology of tantalum and niobium, which is applied in the field of recovery of waste tantalum and niobium smelting diluted salt, can solve the problems that the diluted salt cannot be reused and consumes a lot, and achieve the effect of increasing the content and simplifying the process

Inactive Publication Date: 2007-10-24
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing process, there is no effective method for removing impurities and separating non-potassium salts (mainly NaF, NaCl), so the diluted salt cannot be reused and consumes a lot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The main components of a typical mixed waste diluted salt are shown in Table 1:

[0016]

project

name

chemical composition

(％)

(PPM)

h 2 o

KF

KCl

NaCl

Fe

Ni

Cr

Ca

Mg

B

Si

waste diluted salt

0.1

82.0

2.7

15

240

40

10

10

8

4

20

[0017] Take 1000Kg of waste mixed salt, add water to dissolve it, then add lime to adjust the pH value to 12, impurities such as Fe, Ni, Cr, Si, Ca, Mg in the solution will form insoluble alkalization, and these impurities can be removed by filtration. Control the filtrate to evaporate at a high temperature of 100°C, NaF and NaCl will continue to crystallize and precipitate, while KF and KCl will remain in solution. When evaporated to a density of 1.320g / cm 3 When the time is up, stop evaporation, keep warm, filter off the solid and separate NaF an...

Embodiment 2

[0020] The main components of a typical mixed waste diluted salt are shown in Table 3:

[0021]

project

name

chemical composition

(％)

(PPM)

h 2 o

KF

KCl

NaCl

Fe

Ni

Cr

Ca

Mg

B

Si

waste diluted salt

0.08

70.0

29.2

2

240

40

10

10

8

4

20

[0022] Take 500Kg of discarded mixed salt, add water to dissolve, and then add NaOH) to adjust the pH value to 13. Impurities such as Fe, Ni, Cr, Si, Ca, Mg in the solution form insoluble alkalization, and these impurities can be removed by filtration. Control the filtrate to evaporate at a high temperature of 95°C, NaF and NaCl will continue to crystallize and precipitate, while KF and KCl will remain in solution. When evaporated to a density of 1.325g / cm 3 When the time is up, stop evaporation, keep wa...

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PUM

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Abstract

The invention discloses a recycling method of smelted dilute salt of tantalum-niobium alloy in the rare earth metal smelting domain, which comprises the following steps: using water to dissolve the composite salt of waste; adding alkaline to adjust pH value more than 11 to remove impurity; evaporating the composite solution over 90 deg. c; insulating when the solution density reaches 1. 318g / cm3-1. 330g / cm3; separating sodium salt from solution; heating the solution continuously to condense; cooling under the temperature less than 30 deg. c; crystallizing KF and KCl; washing through cool water; removing slight residual liquid attached on the surface; drying to obtain KF and KCl; heating to 500-600 deg. c again; insulating not less than 1h; dehydrating completely; obtaining the hyper-pure anhydrous dilute salt. The invention simplifies the technique with the receiving rate of KF and KCl not less than 92%, which reduces impurity content such as Fe, Ni, Cr, Si, Ca, Mg and so on in the dilute salt with the water content of the dilute salt reaching or exceeding anhydrous standard to improve the KF content in the recycled salt.

Description

technical field [0001] The invention belongs to a method for comprehensive treatment and recycling of smelting waste in the field of rare metal smelting, in particular to a method for recycling waste tantalum and niobium smelting diluted salt. Background technique [0002] Tantalum and niobium products are important products in the rare metal metallurgy industry, and can be widely used in the fields of electronics, hard alloys, chemistry, atomic energy, superconductivity, and aerospace industries. The production process of tantalum used by most enterprises today is: using tantalum-niobium concentrate as raw material, first ball milling, and then HF, H 2 SO 4 Heating and decomposing the high acid, suction filtration, then extracting fluorotantalic acid and fluoroniobic acid from the obtained filtrate with secondary octanol extractant, and finally using the solubility of fluorotantalic acid and fluoroniobic acid in the extractant under low acidity conditions The difference s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02C01D3/04C02F9/04C02F1/58
Inventor 罗岚罗会秋
Owner NANCHANG UNIV
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