SU791626A1 - Method of waste water purification from berillium - Google Patents

Description

(54) METHOD OF WASTEWATER TREATMENT FROM BERILLION The invention relates to wastewater treatment up to the maximum permissible concentration (MAC), in particular to wastewater treatment from beryllium. There is a known method for the purification of wastewater from zerrilli by electrolysis with a soluble iron anode at an anodic current density of 0.04-0.08 A / D bulk density of current O, 2-0, 4 L / l and a flow velocity of 30–20% 0.60 l / dm DJ. The closest in technical essence and the achieved result to the described one is a method of purifying wastewater from beryllium, including treatment with an inorganic reagent and separation of the solid phase pj. In the known method, wastewater with a beryllium concentration of 1-10 g / l is treated with self-dissolving ferrochrome 1/5 slag in an amount of 0.3-2 g / l. This method is based on the coprecipitation of hydrolyzed beryllium ions from the silicate-calcium component of the slag. The consumption of ferrochromic slag is directly related to the initial beryllium content in the wastewater. However, when treating wastewater with a low reaction value of the medium (p: i 3-5), the consumption of self-dispersed slag increases and the filterability of the waste water deteriorates due to the formation of silica gel compounds. Exhausted slag with precipitated beryllium cannot, because of its composition, be used in the main process of extracting beryllium and is dumped. The aim of the invention is to increase the degree of wastewater purification from beryllium and accelerate the process of separating the solid phase. The goal is achieved by using metallic magnesium as an inorganic reagent, preferably in an amount of 510-5-ICT - g / l. Wastewater treatment of beryllium in the proposed method is based on cementation - the property of metals more electronegative to displace from solutions of salts metals less electronegative, and beryllium in this case; tc on magnesium. In addition, the process of cementation is accompanied by the process of co-precipitation of beryllium with magnesium hydroxide, formed as a result of hydrolysis of magnesium. After treatment, the magnesium is separated from the purified waste water.

The consumption of metallic magnesium depends on the initial content of beryllium in wastewater and the degree of dispersion of magnesium.

The process is carried out as follows.

Magnesium sawdust is added to industrial wastewater with a beryllium content of 1-10 g / l at a certain pH, mixed and the mixture is filtered.

Example 1. In waste water with the initial content of beryllium 2 -10 g / l and pH 10 load magnesium sawdust in the amount of 0.05 g / l and process for 5 minutes. After

filtration content of beryllium in purified water 2 10 g / l.

Example 2. Under the conditions of Example 1, 1 - different amount of magnesium sawdust is added to the wastewater, treatment is carried out for 1-10 minutes. The results are presented in Table. one.

Table 1

For comparative characterization of the claimed and known methods, the wastewater is the same;.: And :::; one content of beryllium (I-IC g / l)

magnesium and slag of Aktobe ferroalloy plant are treated for b min. The results are presented in Table. 2. Table2

Using the proposed method of cleaning waste water from beryllium to indicator quantities of ei-o (g / l) provides the following advantages compared with the known methods:

the possibility of treating extremely toxic wastewater to sanitary standards without the use of electric current and high consumption of reagent;

maintaining the required degree of wastewater treatment during acidic reaction of the medium without reducing the filtration rate;

The magnesium spent on the purification, together with the precipitated beryllium, are subsequently directed to the magnesium-thermal reduction of the beryllium, i.e. beryllium is recovered and used, and magnesium is recycled to wastewater treatment;

to intensify the purification process K -1 wastewater by reducing the contact time and increasing the filtration rate in a wide range of pH 3-9.

formula inventive

Claims (2)

1. A method for purifying wastewater from beryllium, which includes treatment with an inorganic reagent and separation of the solid phase, characterized in that metallic magnesium is used as an inorganic reagent to increase the degree of purification and accelerate the separation of the solid phase. 2. A method according to claim 1, wherein metallic magnesium is introduced in the amount of 5-10 5 5-10 g / l. Sources of information taken into account in the examination 1. USSR author's certificate K 542,731, class C 02 C 5/12, 10/28/74. 0 2. USSR author's certificate as per W 2568449 / 28-26, cl. C 02 C 5/02, 12.01 .78.