Technique for preparing sodium fluosilicate by using raffinate extracted from smelting columbite-tantalite ore

A technology for extracting residual liquid and sodium fluorosilicate, applied in silicate, alkali metal silicate, extraction water/sewage treatment, etc., can solve the problems of valence metals not being recycled and not forming decontamination and diversion, etc. Achieve the effect of improving processing efficiency and purification reuse rate, increasing resource utilization, and reducing emissions

Inactive Publication Date: 2005-10-26
NANCHANG UNIV
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  • Summary
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

What kind of wastewater is produced in the production process, what kind of wastewater is treated, no cleaning and diversion is formed, and the valuable metals in the wastewater are not recycled

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Tantalum niobium ore is decomposed by sulfuric acid and hydrofluoric acid, and after the solution extracts tantalum and niobium, HF, H 2 SO 4 The mixed acidity is as high as about 10mol / l. The following table shows the chemical composition of the tantalum-niobium extraction raffinate of tantalum-niobium ore.

[0017] Element

HF(N)

h 2 SO 4 (N)

F -

SO 4 2-

(Ta+Nb) 2 o 5

Ti

Fe

W

mn

Si

1.28

8.61

50.01

464.81

≤1

8.0

18.03

2.9

2.74

0.38

[0018] Firstly, add quartz sand whose stoichiometric ratio is 1.2 times to the extraction raffinate to generate fluosilicic acid, and tungsten is precipitated in the form of tungstic acid, and use solid-liquid separation to extract a small amount of tungsten in the raffinate. Next, add NaOH to the mother liquor after sinking tungsten so that the total amount of sodium ions is 1.2 times the amount of fluorine ions to gen...

Embodiment 2

[0023] Tantalum niobium ore is decomposed by sulfuric acid and hydrofluoric acid, and after the solution extracts tantalum and niobium, HF, H 2 SO 4 The mixed acidity is as high as about 10mol / l. The following table shows the chemical composition of the tantalum-niobium extraction raffinate of tantalum-niobium ore.

[0024] Element

HF(N)

h 2 SO 4 (N)

F -

SO 4 2-

(Ta+Nb) 2 o 5

Ti

Fe

W

mn

Si

2.5

8

200-180

440

≤1

4-5

10-25

3.5

8-12

[0025] Firstly, add quartz sand whose stoichiometric ratio is 1.3 times to the extraction raffinate to generate fluosilicic acid, and tungsten is precipitated in the form of tungstic acid, and use solid-liquid separation to extract a small amount of tungsten in the raffinate. Next, add NaOH to the mother liquor after sinking tungsten so that the total amount of sodium ions is 1.3 times the amount of fluorine ions to generate sod...

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Abstract

The present invention relates to a process for preparing sodium fluorosilicate from extracted residual liquor obtained by smelting tantalum-niobium ores, and said process includes the following steps: adding silica sand into the residual liquor to precipitate and separate out tungstic acid; then adding NaOH or NaCl into mother liquor to obtain sodium fluorosilicate, filtering, washing and drying; and adding NaOH into the mother liquor after which is used for extracting sodium fluorosilicate and making its pH value be 7-8, evaporating and crystallizing to obtain sodium sulfate; soaking the above-mentioned obtained tungstic acid in water, introducing ammonia to make pH value to greater than 8, dissolving crude tungstic acid to form ammonium paratungstate, filtering and separating quartz, evaporating acid crystallizing, drying and roasting to obtain tungsten trioxide.

Description

technical field [0001] The invention belongs to the comprehensive treatment and recycling of smelting waste water in the field of rare metal metallurgy, in particular to the comprehensive treatment and recycling of tantalum-niobium ore smelting extraction raffinate. Background technique [0002] The production process of tantalum-niobium oxides adopted by most smelting enterprises today is: using tantalum-niobium ore as raw material, ball milling first, then HF, H 2 SO 4 Heat the high acid to decompose, filter with suction, then extract fluorotantalic acid and fluoroniobic acid from the obtained filtrate with secondary octanol extractant, and finally use the solubility of fluorotantalic acid and fluoroniobic acid in the extractant under low acidity conditions The difference separates tantalum and niobium. The wastewater produced by this production process can generally be divided into five categories: tantalum and niobium extraction raffinate wastewater; tantalum and niobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26
Inventor 罗岚罗会秋周浪魏秀琴
Owner NANCHANG UNIV
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