SU1650599A1 - Method for purifying electroplating process effluents from metals - Google Patents

Abstract

The invention relates to the treatment of industrial wastewater by flotation, in particular, electroplating industry and can be used to purify water from nickel and copper ions. The aim of the invention is to reduce the cost of the process and to ensure the repeated use of flotation agent. first ethanol in the amount of 30-60 g / g of metal and then flotation agent - suspension of fine wax in the amount of 15-20 g / g of metal and then flotation is carried out. The method allows to reduce the cost of the cleaning process and also repeatedly regenerate and use flotation agent 1 s p p f-1 table 2

Description

The invention relates to the treatment of industrial wastewater, in particular, electroplating industry and can be used to clean water from nickel and copper ions by flotation

The purpose of the invention is to reduce the cost of the process and to ensure the reuse of the flotation agent.

Example 1. Waste water containing 50 g / m of nickel sulphate is injected in the form of a suspension of 850 g / m3 (17 g / g of metal) of finely dispersed peat wax. The water is alkalinized with vigorous stirring until the pH of the complete precipitation of nickel hydroxide is added and 2 KP / MJ of ethanol (40 g / g of metal). Flotation is carried out for 5 minutes at an air intake rate of 50 cm3 / min per 1 l of treated water.

The flotation product is removed mechanically.

The degree of water purification from nickel is 99.9%

In parallel, the "cleaning process according to a known method is carried out

Comparative data on the consumption of reagents used for wastewater treatment according to the known and proposed methods are given in Table 1.

Data on wastewater treatment from nickel and copper in the processing of different amounts of peat animal, brown coal wax and ethanol are given in Table 2.

From the data obtained in Tables 1 and 2, the totality of distinctive gfiznakov, namely the introduction of ethanol into water (in the amount of 30-60 g / g of recoverable metal) and the treatment of water with a suspension of finely dispersed wax (in the amount of 15-20 g / g of recoverable metal) allows you to significantly reduce the cost of cleaning electroplating, while maintaining a relatively high degree of extraction of nickel and copper ions from water

The reagent is regenerated by treating the flotation product heated to the melting point of wax (70–80 ° C) with a 5% mineral solution.

and C

with with

h

3

acids (10 l / kg of flotation agent). After cooling the solution, the regenerated wax is separated, dispersed and reused in the water purification process. 5-6 times regeneration and the use of wax do not impair its flotation properties.

Claims (2)

Claims 1. Method for cleaning galvanic drains from metals, including treating water with a flotation agent, alkalinizing to pH of complete precipitation of the hydroxide of the extracted metal la, the introduction of the collector and flotation, characterized in that, in order to reduce the cost of the method and ensure the repeated use of the flotation agent, the treatment is carried out with a suspension of finely dispersed wax, and ethanol is introduced into the water before flotation. 2. A method according to claim 1%, characterized in that the treatment is carried out with a suspension of animal, peat or brown coal wax in an amount of 15-20 g / g of the extracted metal, and ethanol is introduced in the amount of 30-60 g / g of the extracted metal. Table 1 table 2 Continued table. 2