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Method for preparing sodium stannate by utilizing tin-removed wastewater

A technology for tin stripping wastewater and sodium stannate, applied in chemical instruments and methods, tin compounds, water/sewage treatment and other directions, can solve problems such as unfavorable environmental protection, high roasting temperature, long reaction time, etc., and achieve good development prospects, The effect of reducing the roasting temperature and increasing the leaching rate

Active Publication Date: 2013-06-26
QINGYUAN XINLV ENVIRONMENTAL TECHNOLOGY CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

[0013] In some processes for treating tin stripping wastewater, the roasting temperature is higher (up to 850-950 ° C), and the reaction time is longer (2.5-5 hours), which will inevitably greatly increase energy consumption, not only increase costs, but also not conducive to environmental protection.

Method used

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Embodiment 1

[0038] As shown in the figure, the method for preparing sodium stannate by utilizing tin stripping wastewater comprises the following steps:

[0039] 1. The tin stripping wastewater is subjected to precipitation treatment, and the filtered sludge is heated and dried at about 120°C. This step will affect the subsequent reaction quality, so it is necessary to ensure that the sludge is completely dry. The dried sludge is the tin sludge used as the raw material for the reaction, which is pulverized into powder by a pulverizer for later use. The chemical element analysis results of the sludge or tin sludge are shown in Table 1.

[0040] Table 1 Analysis results of chemical elements of sludge / tin sludge

[0041] detection item sn Pb Cu Fe As Sb organic matter Moisture* Ingredient content / % 40.6 0.00013 4.11 6.93 0.00024 0.000201 0.48 49.0

[0042] (*Except for "moisture" which is the test result of sedimentation, other test items are the...

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Abstract

The invention relates to the sewage treatment technology and in particular relates to a method for preparing sodium stannate by utilizing tin-removed wastewater. The method for preparing sodium stannate by utilizing tin-removed wastewater comprises the following steps of: uniformly mixing tin paste, strong base and water to form a blank material; controlling the temperature to 90 DEG C to 600 DEG C, sintering the blank material for 2-4 hours and forming dry materials after cooling and crushing the blank material; mixing the dry materials with water to form first lixivium, stirring and reacting the first lixivium; carrying out solid-liquid separation on the first lixivium to obtain first filtrate and first sediment; evaporating, concentrating, crystallizing and cleaning the first filtrate to obtain a sodium stannate crude product; and drying the sodium stannate crude product to obtain the sodium stannate product. According to the method for preparing sodium stannate by utilizing tin-removed wastewater disclosed by the invention, the gentle preparation conditions are utilized for greatly reducing the roasting temperature of the existing process, greatly reducing the energy consumption and simplifying the leaching process. Moreover, the thin leaching rate is improved, the economic benefits are remarkable and the development prospect is good.

Description

technical field [0001] The invention relates to sewage treatment technology, in particular to a method for the treatment and recycling of circuit board tin stripping wastewater. Background technique [0002] In the circuit board processing process, the etching operation of the circuit board is an important part of the circuit board processing, and the circuit needs to be effectively protected before etching. The etching of the circuit board is divided into two processes: acid etching and alkaline etching. The acid etching is protected by ink, and the alkaline etching is protected by a tin layer. After the alkaline etching of the circuit board, the protective tin layer needs to be removed. The general tin stripping solution is nitric acid solution, equipped with ferric nitrate, nitric acid stabilizer and copper corrosion inhibitor. When the amount of tin in the tin stripping solution reaches a certain concentration, the tin stripping ability decreases, so it is scrapped, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/00C02F11/00C02F1/00
Inventor 陈文衡
Owner QINGYUAN XINLV ENVIRONMENTAL TECHNOLOGY CO LTD
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