SU683794A1 - Apparatus for purifying cyanide-containing waste water - Google Patents

Description

I

The invention relates to the field of mineral processing and is intended for the purification of cyanide-containing wastewater and pulp of gold extraction factories, can be used for the purification of industrial wastewater in the chemical, metallurgical industry, in hydrometallurgical processes for the extraction of non-ferrous, noble and rare metals during leaching of metals from ores and concentrates.

A ion exchange filter for wastewater treatment is known, containing a series of columns filled with sorbent and having connections for supplying and discharging air ij.

A disadvantage of the known filter is the low filtration rate due to sorbent clogging.

It is also known a device for treating cyanide-containing wastewater and i pulps, consisting of a column equipped with an airlift for mixing the pulp and

ion exchange resin, and drainage device 2.

The disadvantages of this device are as follows.

Large losses of ion exchange resin due to mechanical destruction during contact of ion exchangers with solid particles of pulp and during pumping of ion exchangers through drainage devices (losses of ion exchangers reach 20-ZOO g / works); limited assortment of impregnated ion exchangers, which depends on the size of the sieve of the drainage device (the sizes of granulated ion exchangers must be at least 0.4-0.5 mm, smaller granules, penetrating through the sieves, are irretrievably lost) when a mixture consisting of cation exchanger and anion exchanger is used, after their separation on drainage devices from pulp.

Claims (2)

A device for wastewater treatment is known, comprising a housing divided by vertically installed portions into chambers filled with sorbents, nozzles for introducing the original wastewater and sorbents, nozzles for withdrawing purified water and sorbents h. This device is the closest to the technical essence and the achieved result to the proposed one. A disadvantage of the known device is the low cleaning efficiency and significant loss of sorbents. The aim of the invention is to increase the cleaning efficiency and reduce the loss of sorbents by preventing their displacement and contact with the solid phase of the water being purified. The goal is achieved by the fact that it is cleaned with a filter cloth installed on each partition made perforated. It is also advisable to provide the device with common collectors, and each chamber with a nozzle for entry and with a nozzle for air outlet, connected to common headers. FIG. 1 shows a device for the treatment of dianide-containing wastewater; in fig. 2 - section A-A of FIG. one; in fig. 3 - section bb FIG. 1. A device for purifying cyanide-containing wastewater consists of a housing 1 with a nozzle 2 for introducing the original from waste water and nozzles 3 and 4 for introducing sorbents. Nozzles 2-4 are made in the form of downwardly extending slotted nozzles located vertically at the walls of the housing. In the lower part of the housing there is a pipe for the discharge of purified water 5 and pipe 6 and 7 for the removal of sorbents. A collector 8 is connected to the housing, to which the nozzles 9 are connected for injecting air into each chamber. In order to remove air from the chambers, the pipes S are attached to the common collector 11. In the case there are vertically installed frameworks consisting of filter fabric 12 placed between the perforated partitions 13 sealed with rubber gaskets 14 in the grooves 15. At the bottom the case is made in the form of three truncated pyramids, narrowing downwards from the frameworks and walls of the housing, where ceramic filter cables are installed 16. The device works as follows. Through the pipes 2 - 4, pulp and sorbents (ion exchangers) enter the body, through pipe 3 - anisnees, and after 4 cation resin. From the bottom, air enters the body through the nozzles 9 through the filters 10, which mixes the pulp in the middle chamber separated by partitions and ionites in the outer chambers. Thanks to the filter, the liquid phase of the pulp freely penetrates through the filter fabric 12 into the whole space of the body, but at the same time, it prevents the solid phase of the pulp from penetrating into the chambers where the ionites are located, and to the ionites into the chamber where the pulp is located. The liquid phase of the pulp is purified from metal cation exchangers and, for example, toxic cyanide complex anions of heavy and non-ferrous metals. As they saturate, the ion exchangers are removed from the housing through nozzles 6 and 7. The purified water is removed through nozzle 5. Thus, the presence of filter cloth installed on each partition made perforated, and that the device is equipped with air inlets and outlets. em to use for ion-exchange processes powdered ion exchangers possessing high kinetic properties, including low-grade (in the sense of fatigue) ion exchangers, to reduce the irretrievable losses of ion exchangers, to increase the cleaning efficiency, which osobstvuet preservation of the environment from contamination by toxic components (cyanides). Apparatus of the invention 1. A device for purifying cyanide-containing waste water, comprising a housing divided by vertically installed partitions into chambers filled with sorbents, nozzles for introducing the original waste water and sorbents, nozzles for withdrawing purified water and sorbents, characterized in that increasing the cleaning efficiency and reducing the loss of sorbents by preventing their displacement and contact with the solid phase by purifying water; it is equipped with filter cloth installed on each partition; perforated. 2. An apparatus according to claim 1, characterized in that it is provided with common collectors, and each chamber is provided with an input nozzle and a nozzle for output of air connected to common collectors. sf4 INIIPIZakaz 5181/5 Circulation 877 Subscription Branch PGPP, Uzhgorod, st. Project 4 4 Sources of information taken into consideration during examination 1. UK patent No. 1О62296, cl. B 1 7, 1967. BO2, ilri.-iKCium I. i. and Tagaru with ;. L. 6837f14 (Gidromstallurtchsh with primitive iolit., Metallurgists, M., 19J4, p. 1.23. 3, US Patent No. 3948775, class 210-264, 1976.