SU567460A1 - Anionite treatment method for extraction of mercury from solutions - Google Patents

Description

(54) METHOD FOR PROCESSING ANIONITE FOR FROM SOLUTIONS EXTRACT OF MERCURY

In the implementation of the proposed method, the sequential treatment of fresh anovit with an alkaline solution of an inorganic sodium salt and a dilute solution of myeral acid increases the sorption activity of the functional groups of the anion exchanger and increases the distribution coefficient of complex mercury ions on anvoaite. Uka, anna treatment of mercury-rich anion exchangers in the presence of nitrates, sulphates and chlorates, the strength of the retention of mercury ions by the anion exchanger. This so-called perchlorate effect, with the obligatory condition of the transfer of mercury ions to mercury oxide using alkali, in turn, effectively eluting mercury from anion exchange resin. At the same time, the subsequent sorption activity of its functional groups, i.e. The distribution coefficient of sorbed, complex mercury ions on the regenerated anibite increases.

Example 1 Sewage of chlorine and caustic alkali produced by mercury electrolysis with PH-2, O - 3.4 is dehydrated with sodium sulfate and passed through two successively connected columns with a diameter of 56 mm with 100 g of AB-17-8 anion exchanger in each column. 1500 ml of an alkaline solution of sodium sulphate with a concentration of caustic soda South / l and sodium sulphate SOOg / l, 400 ml of water, 20OO ml of sulfuric acid solution of concentration 1OO g / l and again 600 ml of water are successively passed through the treated anion exchange resin in the first column. In the case of mercury slip through the second column, 1500 ml of sodium sulfate solution mixed with formalin (concentration 100 g / l and 20 g / l respectively) are passed through the spent anion exchanger, during the reaction of which an appropriate amount of alkali is released into the solution. After this treatment, mercury is again recovered from the wastewater. The table shows the results of the processing of anion exchangers in two columns.

In example 1

54,70,03211766

30,00,0484928

17,40,0294256

36,40,0468042

In example 2

ZOO 450 370 270 18O

190

Example 2. A layer of 200 g of fresh anion exchanger in a column with a diameter of 57 mm is passed from top to bottom, first with 2 liters of alkaline sodium nitrate solution (concentration 99, 94 99.84 99.83

99.87

99.9i

99.95

99.94

99.90

99.91

99.93

Claims (2)

Qi MaOH 10 g / l, Na NOg 50 g / n. then 3 l of nitric acid solution (concentration of 1O g / l) and 1 l of distilled water. Through the thus treated anion exchanger from the bottom up, mercury with sodium sulfite dechlorinated with sewage with PH-2-5 is passed at a rate of 20 liters / hour. Spent anion exchanger is treated in the same way as pre-treatment of fresh anion exchanger in one or two. As a result of this treatment, 250 l of waste water from 72.8 mg / l of mercury to 0.005 mg / with a recovery rate of 99.99% was purified in the first sorption cycle. The results of the four cycles of sorption-desorption of mercury from waste water after treatment of anion exchange resin by the proposed method are given in the table. As can be seen from the table, the degree of mercury recovery from wastewater by the proposed method is 99.83-99.98% (99.0-99.50% when treated in a known manner). The invention reduces the contamination of ponds with mercury and disposes of mercury. without burning anion exchange resin. Thus, the economic efficiency of the invention is to increase the degree of mercury recovery from solutions and reduce the cost of its removal. Claim 1. Method for processing anion ol of extracting mercury from solutions by passing a mineral acid solution through an anion exchanger layer, characterized in that, in order to increase the distribution coefficient of sorbed complex mercury on anion exchanger to increase the degree of mercury recovery from solutions, the anion exchanger is passed through alkaline solution of inorganic sodium salt. 2. A method according to claim 1, wherein t and h and y with the fact that, first through the layer of anion exchange resin, pass an alkaline solution of sodium sulphate or itrate, and then respectively sulfuric or nitric acid. Sources of information taken into account in the examination: 1. O. Samuelson. Ion exchange separation in analytical chemistry. Ed. Chemistry, L., 1966, p. 183.. 2. USSR author's certificate number 331038, cl. C 02 C 5/08, 1969.