SU887473A1

SU887473A1 - Method of acid waste water purification from copper

Info

Publication number: SU887473A1
Application number: SU802909245A
Authority: SU
Inventors: Нора Викторовна Бреденфельд; Генрих Львович Вакс; Владимир Алексеевич Кожемякин; Наталья Сергеевна Градова
Priority date: 1980-04-11
Filing date: 1980-04-11
Publication date: 1981-12-07

Description

(54) СПОСОБ ОЧИСТКИ(54) CLEANING METHOD

КИСЛЫХ СТОЧНЫХ ВОД ОТ МЕДИACID WASTEWATER FROM COPPER

1212

Изобретение относитс к гидрометаллургии цветных металлов и может быть использовано при очистке сточных вод от комплексонатов меди.The invention relates to hydrometallurgy of non-ferrous metals and can be used in the treatment of wastewater from copper complexates.

Известен способ очистки сточных вод, содержащих комплексонаты медн с ЭДТА (этилендиаминтетрауксусной кислотой), включающий добавление концентрированного раствора едкого натра до значени рН 12-13 с последующим фильтрованием студенистого осадка гидроксидов т желых металлов, разбавлением фильтра до рН 8-9 и биологическое разложение органических остатков комплексных соединений 1.A known method of treating wastewater containing copper-complexed EDTA (ethylenediaminetetraacetic acid), including the addition of a concentrated solution of caustic soda to a pH of 12-13, followed by filtering the gelatinous precipitate of heavy metal hydroxides, diluting the filter to a pH of 8-9 and biological decomposition of organic residues complex compounds 1.

Недостатком способа вл етс большой расход реагентов и длительное фильтрование объемистых студенистых осадков.The disadvantage of this method is a high consumption of reagents and long-term filtration of bulky gelatinous sediments.

Известен также способ перевода примеси меди из раствора в осадок путем добавлени к раствору концентрированного известкового молока до рН 13-14 2.There is also known a method of converting copper impurities from a solution to a precipitate by adding to the solution concentrated lime milk to a pH of 13-14 2.

Недостатком способа вл етс большой расход реагентов дл создани столь высокого зна1чени рН и длительное фильтрование студенистых осадков.The disadvantage of this method is the high consumption of reagents for creating such a high pH value and long-term filtration of gelatinous precipitates.

Наиболее близким к изобретению техническим решением вл етс способ очистки кислых сточных вод от меди путем цементации меди на железном скрапе илиThe closest technical solution to the invention is a method for purifying acid wastewater from copper by cementation of copper on iron scrap or

никелевом песке с последующим отделением осадка 3.nickel sand followed by separation of sediment 3.

Недостатком способа вл етс то, что он примен етс дл грубой, предварительной очистки концентрированных по меди сточных вод с целью ее утилизации и что отработанные очищаемые растворы вместо мади загр зн ютс примесью железа или никел , дл очистки от которых требуетс The disadvantage of the method is that it is used for coarse, pre-treatment of copper-concentrated wastewater for the purpose of its disposal, and that the spent cleaning solutions instead of the bottom are contaminated with an admixture of iron or nickel, which requires cleaning.

10 использование дополнительных операций. Этот способ также требует дальнейщей доочистки сточных вод от меди до концентраций , допустимых дл сброса вод в водоемы .10 use of additional operations. This method also requires further purification of wastewater from copper to the concentrations allowable for the discharge of water into water bodies.

15 Цель изобретени - повышение степени очистки сточных вод от меди.The purpose of the invention is to increase the degree of wastewater purification from copper.

Цель достигаетс тем, что в способе очистки кислых сточных вод от меди цементацию ведут на алюминиевой струлскеThe goal is achieved by the fact that in the method of purifying acid wastewater from copper, cementation is carried out on aluminum strulsk

20 при рН 1-2, полученный осадок отдел ют предпочтительно при 25-95° С.20 at pH 1-2, the precipitate obtained is separated preferably at 25-95 ° C.

Способ осуществл ют следующим образом .The method is carried out as follows.

В исходную сточную воду, содержащуюIn the original wastewater containing

25 комплексонаты меди с ЭДТА и тетраамином , добавл ют стружку и перемешивают при 25-95° С. Затем раствор фильтруют. Сущность предлагаемого способа очистки сточных вод от комплексонатов меди 25 copper complexates with EDTA and tetraamine, chips are added and mixed at 25-95 ° C. Then the solution is filtered. The essence of the proposed method of wastewater treatment from complexating copper

Claims

30 is that when the solution is acidified to pH 1-2, the copper complexonates are destroyed, and the process of cementation of copper on aluminum chips in the temperature range 25-95 ° C is most effective. Addition of acid in quantities smaller than necessary to create a pH of 1-2 does not allow the destruction of durable copper complexonates with EDTA and tetraamine, and the process of cementation of copper practically does not proceed even when boiling solutions with aluminum chips. Adding to wastewater a significant excess of acid in quantities greater than is necessary to create a pH of 1–2 results in an increase in the residual equilibrium concentration of copper in the solution after it is in contact with aluminum chips (more than I mg / l for copper). At room temperature (25 ° C), the residual copper content in wastewater, equal to or less than 1 mg / l, is reached in 20 minutes. Increasing the temperature of the cementation process to 95 ° C accelerates the cleaning process from copper impurities by 2-4 times, raising the temperature above 95 ° C leads to unreasonable energy consumption. Example 1. To 200 ml of the initial solution containing its copper complexant with EDTA and 6 mg / l tetraamine for copper, add 2 ml of 2.5N hydrochloric acid pH 2 and 20 g of aluminum chips. The mixture is stirred for 20 minutes at 25 ° C. The solution is filtered. The residual copper content in the filtrate is less than 1 m, g / l. Example 2. To 400 ml of the same solution with the same copper content were added 40 ml of 2.5N hydrochloric acid (pH 1) and 100 g of aluminum chips. The mixture was stirred at 95 ° C for 5 minutes. The solution is filtered. The residual copper content in the filtrate is less than 1 mg / l. Thus, the proposed method of purification of wastewater from copper makes it possible to reduce the copper content to 1 mg / l or less. Previously known methods of purification did not give such a result, polluted sewage with other harmful components, iron, nickel. Claims 1. Method for purifying acid wastewater from copper by cementation and subsequent separation of the precipitate formed, characterized in that, in order to increase the degree of purification, cementation is carried out on aluminum chips at a pH of 1-2. 2. The method according to claim 1, characterized in that the cementation is carried out at 25-95 ° C. Sources of information taken into account during the examination: 1. Author's certificate of the USSR No. 525627, cl. C 02 C 5/02, 1974.

2. Milovanov L. V. Purification and use of wastewater from non-ferrous metallurgy enterprises, Moscow, Metallurgists, 1971, p. 116.

3. Milovanov L. V. Purification and use of wastewater from non-ferrous metallurgy enterprises, Moscow, Metallurgists, 1971, p. 118-119 (prototype).