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Method for preparing silver nitrate with various types of silver-ion-containing waste water as raw materials

A technology of silver ions and silver nitrate, applied in chemical instruments and methods, silver compounds, silver compounds and other directions, can solve the problem of high equipment requirements, and achieve the effects of low equipment requirements, low cost and simple process

Active Publication Date: 2012-06-20
CHONGQING KOOPPER CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the recovery of silver is mainly to add hydrochloric acid to form a precipitate, and then ignite at high temperature to recover silver, but this method requires higher equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Example 1: 200Kg of silver-containing waste water (the silver-containing concentration is 1% after analysis) is added in a 500L reactor, and 100Kg of chloroform is added, stirred for 10 minutes, left to stand for 30 minutes to separate the liquid and discard the chloroform layer, and then add trichloromethane Chloromethane 100Kg, stirred for 10 minutes, stood still for 30 minutes, separated and discarded the chloroform layer to obtain the water layer. Under stirring, 2.5 Kg of ascorbic acid was added to the treated water layer, and the temperature of the steam was raised to 50° C. for 60 minutes to react. Cool down to 25°C, discharge and filter to obtain 6.2Kg of silver ascorbate complex in filter cake. Transfer 6.2Kg of filter cake silver ascorbate complex to a 30L reactor, add 6.0Kg of 65% concentrated nitric acid dropwise with stirring, and after the addition is complete, raise the temperature to 60°C and stir for 45 minutes. The reaction solution was concentrated u...

example 2

[0018] Example 2: Transfer 300Kg of silver-containing waste water (the silver-containing concentration is 1.5% after analysis) to a 500L reactor, add 150Kg of dichloromethane, stir for 10 minutes, leave it to stand for 30 minutes to separate the liquid and discard the dichloromethane layer, and add 150 Kg of dichloromethane, stirred for 10 minutes, allowed to stand for 30 minutes, separated and discarded the dichloromethane layer to obtain an aqueous layer. Under stirring, 6.5 Kg of ascorbic acid was added to the treated water layer, and the temperature was raised to 60° C. for 45 minutes to react. Cool down to 25°C, discharge and filter to obtain 12Kg of filter cake silver ascorbate complex. Transfer 6.2Kg of the filter cake silver ascorbate complex to a 50L reactor, add 15Kg of 65% concentrated nitric acid dropwise with stirring, and after the addition is complete, raise the temperature to 60°C and stir for 45 minutes. The reaction solution was concentrated under reduced pr...

example 3

[0019] Example 3: 1000Kg of silver-containing waste water (after analysis, the concentration of silver is 1%) is added in a 2500L reactor, 600Kg of ethyl acetate is added, stirred for 10 minutes, left to stand for 30 minutes to separate the liquid and discard the ethyl acetate layer, and then add acetic acid Ethyl 400Kg, stirred for 10 minutes, allowed to stand for 30 minutes, separated and discarded the ethyl acetate layer to obtain the water layer. Under stirring, 7.5Kg of ascorbic acid was added to the treated water layer, and the steam was heated to 50° C. for 60 minutes to react. Cool down to 25°C, discharge and filter to obtain 31Kg of filter cake silver ascorbate complex. Transfer 31Kg of filter cake silver ascorbate complex to a 150L reactor, add 30.0Kg of 65% concentrated nitric acid dropwise with stirring, and after the addition is complete, raise the temperature to 60°C and stir for 45 minutes. The reaction solution was concentrated under reduced pressure to a cert...

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PUM

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Abstract

The invention discloses a method for preparing silver nitrate with various types of silver-ion-containing waste water as raw materials, which is characterized in that an organic solvent is added to the silver-ion-containing waste water to extract organic matter by dissolving, ascorbic acid is then used for complexing of silver ions, and then silver nitrate is prepared through redox and nitration of concentrated nitric acid. According to the method, the ascorbic acid and metal ions can form complex compound to extract silver, then concentrated nitric acid is added, and the silver nitrate can be prepared through redox and nitratlon reaction. The method is simple in process, easy to operate, high in recovery rate and low in cost, does not require high temperature and high pressure in the whole process, has low requirement for equipment, and greatly lowers production cost of products. In addition, the recovered silver nitrate can be directly utilized.

Description

technical field [0001] The invention belongs to the field of chemical industry and medicine, and specifically relates to a method for preparing silver nitrate by using various silver ion-containing waste water as raw materials. Background technique [0002] In organic synthesis, silver nitrate can be used as a reaction catalyst to increase the rate of chemical reactions. However, the reaction itself is complicated, and one reaction is often accompanied by several side reactions, so the recovery of the catalyst has become quite difficult. In recent years, the price of precious metal silver has been rising steadily, and the recovery of precious metal silver is imperative. With the rapid development of the photosensitive material industry and the electronic industry, the consumption of silver nitrate has increased sharply, and it has become a research hotspot to seek new channels for raw materials and processes to increase the production of silver nitrate. In the prior art, th...

Claims

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Application Information

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IPC IPC(8): C01G5/00C02F9/04
Inventor 徐志刚李倩邹潜汤启明
Owner CHONGQING KOOPPER CHEM IND
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