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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 treatment cost of tin stripping solution, complex process and equipment structure, etc. Simple structure, realizing the effect of resource utilization, simple process and equipment structure

Inactive Publication Date: 2014-08-06
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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: A kind of method utilizing tin stripping solution to co-produce sodium stannate and tin dioxide comprises the following steps: A, the tin stripping solution is heated at a temperature of 70°C and a pressure of 0.1×1.03×10 5 Carry out underpressure distillation recovery nitric acid, add Na in the distillate 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 then pressed dry;

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

[0032] C. Put the filter cake obtained in step A into the reactor, add solid NaOH with a molar ratio of 1:2 to the filter cake, heat up to 98°C under stirring, and keep it warm for 2 h...

Embodiment 2

[0035] Embodiment 2: a kind of method utilizing tin stripping solution to co-produce sodium stannate and tin dioxide comprises the following steps:

[0036] A. Put the tin stripping solution at a temperature of 50°C and a pressure of 0.4×1.03×10 5 Carry out underpressure distillation recovery nitric acid under Pa, add Na in distillate 3 PO 4 , Na 3 PO 4 The dosage is 60g / L tin stripping solution. After the sedimentation is completed, press filter, and the filter cake is washed and then dried;

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

[0038]C. Put the filter cake obtained in step A into the reactor, add solid KOH with a molar ratio of 1:3.5 to the filter cake, heat up to 105°C under stirring, and keep it warm fo...

Embodiment 3

[0041] Embodiment 3: a kind of method utilizing tin stripping solution to co-produce sodium stannate and tin dioxide comprises the following steps:

[0042] A. Put the tin stripping solution at a temperature of 60°C and a pressure of 0.3×1.03×10 5 Carry out underpressure distillation to reclaim nitric acid under Pa, add K in the distillate 2 SO 4 , K 2 SO 4 The dosage is 40g / L tin stripping solution. After the sedimentation is completed, press filter, and the filter cake is washed and then dried;

[0043] B, neutralize the filtrate and washing solution obtained in step A with alkali, control the pH value of the solution at 6-8, then add sodium sulfide solution until the precipitation no longer generates, 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°C under stirring, ...

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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 by using a tin stripping liquid, in particular to a method for co-producing sodium stannate and tin dioxide by using a non-fluoride type printed board tin stripping liquid. Background technique [0002] PCB (printed circuit board) enterprises are an industry that produces a large amount of liquid / solid industrial waste. The type of liquid waste generated (referred to as waste liquid) is the scrapping or waste of liquid in the working tanks of each process. Produced when the cylinder is changed, it is characterized by high concentration of pollutants, many types, and complex components. Tin stripping is the process that produces the largest amount of wastewater in PCB companies. The tin stripping solution produced has high heavy metal content (tin and copper content can reach more than 100g / L), high pollution index, and free acid has high acidity and complex components. ...

Claims

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Application Information

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