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Method for co-producing sodium stannate and stannic oxide by solder removing liquid

A technology of tin dioxide and sodium stannate, applied in the directions of tin oxide, chemical instruments and methods, tin compounds, etc., can solve the problems of high cost of tin stripping solution, complicated process and equipment structure, etc. Simple structure, realizing the effect of resource utilization, simple process and equipment structure

Inactive Publication Date: 2011-01-19
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of high cost of tin stripping liquid treatment, complex process and equipment structure in the prior art, and provide a method for co-producing sodium stannate and tin dioxide using tin stripping liquid

Method used

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  • Method for co-producing sodium stannate and stannic oxide by solder removing liquid
  • Method for co-producing sodium stannate and stannic oxide by solder removing liquid
  • Method for co-producing sodium stannate and stannic oxide by solder removing liquid

Examples

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Embodiment 1

[0030] Example 1: A method for co-producing sodium stannate and tin dioxide using tin stripping liquid, including the following steps: A. Put the tin stripping liquid at a temperature of 70°C and a pressure of 0.1×1.03×10 5 Under reduced pressure distillation to recover nitric acid, add Na to the remaining liquid 2 SO 4 , The dosage of electrolyte is 30g / L tin stripping solution, after the sedimentation is completed, press filter, the filter cake is washed and pressed dry;

[0031] B. Neutralize the filtrate and washing liquid obtained in step A with alkali, control the pH value of the solution at 6-8, then add sodium sulfide solution until precipitation no longer occurs, filter, the filter cake is copper sulfide, and the filtrate is sent to sewage treatment system;

[0032] C. Send the filter cake obtained in step A into the reaction kettle, add solid NaOH with a molar ratio of 1:2 to the filter cake, heat to 98°C with stirring, and keep it for 2 hours to make β-metastannic acid an...

Embodiment 2

[0035] Embodiment 2: A method for co-producing sodium stannate and tin dioxide using tin stripping solution, including the following steps:

[0036] A. Put the tin stripping liquid at a temperature of 50°C and a pressure of 0.4×1.03×10 5 Recover nitric acid by vacuum distillation under Pa, and add Na to the remaining liquid 3 PO 4 , Na 3 PO 4 The dosing amount is 60g / L tin stripping liquid, after the sedimentation is completed, press filter, the filter cake is washed and then pressed dry;

[0037] B. Neutralize the filtrate and washing liquid obtained in step A with alkali, control the pH value of the solution at 6-8, then add sodium sulfide solution until precipitation no longer occurs, filter, the filter cake is copper sulfide, and the filtrate is sent to sewage treatment system;

[0038] C. Send the filter cake obtained in step A into the reaction kettle, add solid KOH with a molar ratio of 1:3.5 to the filter cake, heat up to 105°C with stirring, and keep it for 1 hour to make β-...

Embodiment 3

[0041] Embodiment 3: A method for co-producing sodium stannate and tin dioxide using tin stripping solution, including the following steps:

[0042] A. Put the tin stripping liquid at a temperature of 60℃ and a pressure of 0.3×1.03×10 5 Recover nitric acid by vacuum distillation under Pa, add K to the remaining liquid 2 SO 4 , K 2 SO 4 The dosing amount is 40g / L tin stripping liquid, after the sedimentation is completed, press filter, the filter cake is washed and pressed dry;

[0043] B. Neutralize the filtrate and washing liquid obtained in step A with alkali, control the pH value of the solution at 6-8, then add sodium sulfide solution until precipitation no longer occurs, filter, the filter cake is copper sulfide, and the filtrate is sent to sewage treatment system;

[0044] C. Send the filter cake obtained in step A into the reactor, and add solid NH with a molar ratio of 1:3 to the filter cake 3 H 2 O, heat up to 100℃ with stirring, keep for 1.5h to convert β-metastanoic acid a...

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Abstract

The invention discloses a method for co-producing sodium stannate and stannic oxide by solder removing liquid, comprising the following steps: separating tin in the solder removing liquid, recovering copper, transforming copper into sodium stannate, preparing sodium stannate and preparing stannic oxide. The method of the invention features in low processing cost, simple technical process and device structure, and high product purity and can prepare sodium stannate and stannic oxide.

Description

Technical field [0001] The invention relates to a method for co-producing sodium stannate and tin dioxide using a tin stripping solution, in particular to a method for co-producing sodium stannate and tin dioxide by using a non-fluoride type printed board tin stripping solution. Background technique [0002] PCB (printed circuit board) enterprises are an industry that produces a large amount of liquid / solid industrial waste. The liquid waste (referred to as waste liquid) produced is the scrap or waste of liquid in the working tank of each process. It is produced when the cylinder is changed and is characterized by high pollutant concentration, multiple types and complex composition. Tin stripping is the process that produces the largest amount of waste water in PCB companies. The tin stripping solution produced has high heavy metal content (tin and copper content can reach 100g / L or more), high pollution index, high free acidity, complex components, and generally contain acid Ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/00C01G19/02
Inventor 张利毛逢银
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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