Method for reducing content of tetravalent stannum in stannous mono-sulphate

A technology of stannous sulfate and tetravalent tin, which is applied in the electrolysis process and electrolysis components, can solve the problems of affecting the storage validity period and product appearance, unsuitable for large-scale continuous production, and difficult and precise control of current density, so as to improve the international Competitiveness, low cost, and the effect of improving quality

Active Publication Date: 2017-11-24
FINE CHEM GRP
View PDF10 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the tetravalent tin content seriously affects its storage validity period and product appearance
[0004] Domestic scholar Wei Qing (Journal of Wuyi University, 2000, 14, 55-59) once reported that the current density needs to be controlled to suppress tetravalent tin when preparing stannous sulfate in the laboratory, but this method is obtained by intermittent electrolysis under laboratory conditions. In the process of large-scale industrial production, the anode area is constantly changing, and the current density is difficult to accurately

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for reducing content of tetravalent stannum in stannous mono-sulphate
  • Method for reducing content of tetravalent stannum in stannous mono-sulphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, a kind of method that reduces tetravalent tin content in stannous sulfate production process, may further comprise the steps:

[0041] 1), lay a layer of tin particles with a thickness of 2cm at the bottom of the stannous sulfate electrolytic cell (particle size D 50 is 2 μm);

[0042] 2), add the acetone oxime as oxygen scavenger in dilute sulfuric acid, obtain the dilute sulfuric acid after the treatment; The consumption ratio of dilute sulfuric acid and oxygen scavenger is 100ml / 0.05g;

[0043] The dilute sulfuric acid is a sulfuric acid solution with a concentration of 1 mol / L;

[0044] 3), in the stannous sulfate electrolytic cell, add the dilute sulfuric acid after the treatment, until the liquid level of the dilute sulfuric acid after the treatment has not crossed the cathode 2~4cm, and the control cell voltage is 1.9V;

[0045] 4), when the content of tin ions in the electrolyte at the bottom of the stannous sulfate electrolytic cell is ≥ 85g / L, ...

Embodiment 2

[0049] Embodiment 2, a kind of method that reduces tetravalent tin content in the stannous sulfate production process:

[0050] Tin particle size D 50 is 10μm;

[0051] Add acetone oxime as oxygen scavenger to dilute sulfuric acid to obtain dilute sulfuric acid after treatment; the dosage ratio of dilute sulfuric acid and oxygen scavenger is 100ml / 0.08g;

[0052] Control the voltage of the electrolytic cell to 2.0V;

[0053] Use acetone as eluent;

[0054] The rest are identical to Example 1.

[0055] The content of tetravalent tin in the obtained stannous sulfate was 0.04%.

Embodiment 3

[0056] Embodiment 3, a kind of method that reduces tetravalent tin content in the stannous sulfate production process:

[0057] Tin particle size D 50 is 1 μm;

[0058] Add hydrazine as an oxygen scavenger to dilute sulfuric acid to obtain dilute sulfuric acid after treatment; the dosage ratio of dilute sulfuric acid to oxygen scavenger is 100ml / 0.08g;

[0059] Control the voltage of the electrolytic cell to 1.8V;

[0060] Use butanone as a rinsing agent;

[0061] The rest are identical to Example 1.

[0062] The content of tetravalent tin in the obtained stannous sulfate was 0.07%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for reducing the content of tetravalent stannum in stannous mono-sulphate. The method for reducing the content of the tetravalent stannum in the stannous mono-sulphate comprises the following steps that a stannum granular layer is laid in the bottom of a stannous mono-sulphate electrolytic tank; a deoxidant is added into a dilute sulphuric acid, and the treated dilute sulphuric acid is obtained; the treated dilute sulphuric acid is added into the stannous mono-sulphate electrolytic tank till the liquid level of the treated dilute sulphuric acid is higher than a cathode by 2-4 cm, and the voltage of the electrolytic tank is controlled to be lower than 2.4 V; when the content of stannum ions in an electrolyte at the bottom of the stannous mono-sulphate electrolytic tank is greater than or equal to 85 g/L, the electrolyte is discharged out of the tank from an outlet, and the treated dilute sulphuric acid is supplement into the tank to maintain the liquid level of tank liquid to be an original height while the electrolyte is discharged; when the content of the stannum ions in the electrolyte at the bottom of the stannous mono-sulphate electrolytic tank is decreased to 80 g/L, discharging of the electrolyte and supplementing of the treated dilute sulphuric acid are stopped; and the electrolyte is subjected to condensation crystallization, obtained crystals are eluted by using an eluting agent and then dried, and the stannous mono-sulphate is obtained.

Description

technical field [0001] The invention belongs to the field of preparation of stannous sulfate, and in particular relates to a method for reducing the content of tetravalent tin in stannous sulfate. Background technique [0002] Stannous sulfate is a white or light yellow crystalline powder, which can be dissolved in water and dilute sulfuric acid. It is widely used in many industries such as acid electroplating of metals, alloys and non-metallic materials, electrolytic oxidation and coloring of aluminum alloys, hydrogen peroxide remover and mixed with nickel salts as sealing agents, and printed circuit boards. [0003] The stability of divalent tin in stannous sulfate is poor, and it is easily oxidized to tetravalent tin by oxygen in the air. The presence of tetravalent tin will make the stannous sulfate product yellow and harden, and shorten the shelf life of the product. The accumulation of tetravalent tin in use will cause the aging of the bath, the increase of precipitat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C25B15/02C25B1/00
CPCC25B1/00C25B15/02
Inventor 王宙晖江军王兴赵金浩上官鹏鹏
Owner FINE CHEM GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap