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Method for preparing stannous chloride crystals by utilizing PCB tin stripping waste liquid

A technology of stannous chloride and tin tetrachloride, applied in the directions such as stannous chloride, tin halide, photography technology, etc., achieves the effects of low production cost, low environmental pollution, and easy control of process parameters

Inactive Publication Date: 2021-03-16
HUIZHOU ZHENDING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above problems, the invention provides a kind of method utilizing PCB tin stripping waste liquid to prepare stannous chloride crystal, this method is raw material with tin hydroxide, hydrochloric acid that reclaim from PCB non-nitric acid type tin stripping liquid, production process There is no need to introduce chlorine gas, no need to purchase expensive metal tin ingots, the production efficiency is high, and the product can meet the national standard of stannous chloride dihydrate crystal without crushing and screening, which can meet the needs of electroplating, textile printing and dyeing, pesticide production and other industries Demand for stannous chloride quality

Method used

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  • Method for preparing stannous chloride crystals by utilizing PCB tin stripping waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Configure a tin stripping solution with a methanesulfonic acid concentration of 5mol / L and a hydrogen peroxide concentration of 50ml / L, put it into the circuit board tin stripping tank, control the tin stripping temperature at 40°C, and add hydrogen peroxide quantitatively during the tin stripping process to maintain its concentration At 50ml / L, replace the tin stripping solution after the tin hydroxide content in the tin stripping solution reaches a certain concentration.

[0044] A kind of method utilizing PCB tin stripping waste liquid to prepare stannous chloride crystal comprises the following steps:

[0045] Step 1: Collect the PCB tin stripping waste liquid, use a filter press to separate the solid and liquid in the PCB tin stripping waste liquid, and collect the solids of the PCB tin stripping waste liquid, and the solid is tin hydroxide solid;

[0046] Step 2: Clean the tin hydroxide solid prepared in step 1, add hydrochloric acid solution to the cleaned tin hy...

Embodiment 2

[0057] Configure a tin stripping solution with a methanesulfonic acid concentration of 5.5mol / L and a hydrogen peroxide concentration of 60ml / L, put it into the circuit board tin stripping cylinder, control the stripping temperature at 45°C, and add hydrogen peroxide quantitatively during the tin stripping process to make its concentration Keep it at 60ml / L, and replace the tin stripping solution after the tin hydroxide content of the tin stripping solution reaches a certain concentration.

[0058] A kind of method utilizing PCB tin stripping waste liquid to prepare stannous chloride crystal comprises the following steps:

[0059] Step 1: Collect the PCB tin stripping waste liquid, use a filter press to separate the solid and liquid in the PCB tin stripping waste liquid, and collect the solids of the PCB tin stripping waste liquid, and the solid is tin hydroxide solid;

[0060] Step 2: Clean the tin hydroxide solid prepared in step 1, add hydrochloric acid solution to the clea...

Embodiment 3

[0071] Configure a tin stripping solution with a methanesulfonic acid concentration of 6mol / L and a hydrogen peroxide concentration of 70ml / L, put it into the circuit board tin stripping tank, control the tin stripping temperature at 50°C, and add hydrogen peroxide quantitatively during the tin stripping process to maintain its concentration At 70ml / L, replace the tin stripping solution after the tin hydroxide content in the tin stripping solution reaches a certain concentration.

[0072] A kind of method utilizing PCB tin stripping waste liquid to prepare stannous chloride crystal comprises the following steps:

[0073] Step 1: Collecting the PCB tin stripping waste liquid, using a centrifuge to separate the solid and liquid in the PCB tin stripping waste liquid, and collecting the solids of the PCB tin stripping waste liquid, the solid being tin hydroxide solid;

[0074] Step 2: Clean the tin hydroxide solid prepared in step 1, add hydrochloric acid solution to the cleaned t...

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Abstract

The invention relates to the technical field of preparation methods of stannous chloride crystals, and provides a method for preparing stannous chloride crystals by utilizing PCB tin stripping waste liquid, which comprises the following steps: washing tin hydroxide solids recovered from the PCB tin stripping waste liquid, dissolving tin hydroxide into a tin tetrachloride solution by using hydrochloric acid, reducing the stannous chloride solution the stannous chloride solution through a diaphragm electrolysis method, further purifying and concentrating the stannous chloride solution under reduced pressure, performing cooling to obtain clean and white stannous chloride crystals, and stannous chloride prepared through the method is free of caking, good in liquidity and free of crushing and screening. According to the method, the stannic chloride solution is reduced into the stannous chloride solution through diaphragm electrolysis, a traditional process for reducing the stannous chloridesolution mainly through a metallic tin ingot is replaced, expensive metallic tin is saved, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of preparation methods of stannous chloride crystals, in particular to a method for preparing stannous chloride crystals by utilizing PCB tin stripping waste liquid. Background technique [0002] Tin protochloride, namely stannous chloride dihydrate, is an important tin chemical raw material, which is widely used in electroplating, catalytic synthesis, pesticide synthesis, chemical analysis and other industries. Traditional production methods of stannous chloride dihydrate use tin ingots as raw materials, mainly including chlorine gas method and hydrochloric acid method. [0003] Chinese authorized invention patent CN85106332B discloses a preparation method of tin protochloride, which uses metal tin, chlorine gas and water in the presence of hydrochloric acid to react at a temperature of 30°C to 105°C to generate tin chloride, and then add metal Tin is used as a reducing agent, and under the same conditions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/06C25C1/14
CPCC01G19/06C25C1/14
Inventor 高东瑞
Owner HUIZHOU ZHENDING ENVIRONMENTAL PROTECTION TECH CO LTD
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