SU382720A1 - Method of cleaning solutions from mercury - Google Patents

Description

one

The invention relates to a Tdr0: metal / mercury oxidation of mercury, in particular, to a method for purifying ipacTB-opoB from (mercury.

There is a method ochist KI solutions from mercury. And with a jester sorption of its aktgiviro.va1nny, m coal.

However, this method requires a P1 pre1Deep deep cleaning of the soil from impurities e) other ions, since coal does not have a selective absorption with respect to mercury. In addition, activated carbon is characterized by an equivalently low adsorption capacity of ino mercury (0.010-0.015 g / g). Regeneration of mercury from the coal itself using any eluents requires further: processing of solutions of mercury salts.

The purpose of the invention is to increase the Ste1PbSh1 purification, as well as the release of mercury directly.

This is achieved by using siliceous sarbents containing chlorosilanes, naphpl, immer, white carbon, silica gel, airgel, as well as silicon xyhydride, which have, besides adsorption, strongly pronounced reducing properties, due to the adsorbent. the presence of hydride groups on their surface. The ionic mercury is sorbed by the toxicity of the adsorbent, reduced by the lidride group to the metallic state, settles and

held in the inopaix adsorbent. The adsorbents used are adsorbent with a selective effect on mercury. All this eliminates the need for the preliminary separation of other ions and impurities. The process is characterized by high total extraction of mercury from a solution. The mercury sorption capacity on oxyhydrate silicon, for example, is 1.0-1.2 g / g of the weight of the adsorbent taken, which exceeds e.MiKocTb activated carbon by a factor of 100. The separation of mercury from the adsorbent is carried out by dissolving the latter in alkali. Metallic mercury, decal decanting silicate solution and

giromshki, characterized by high purity.

The proposed method is to be applied for E31 mercury taken from both its concentrated and depleted solutions.

salts.

Example 1. Four awnings of I g of each adsorbent (white soot, airgel, silica gel, silicon oxyhydride) previously modified with trichlorosilane are placed in glasses and filled with 2% mercury nitrate solutions containing small amounts of nitrate salts as additives zinc, tin, lead, iron, cobalt, |) Sh1kel, magnesium, aluminum and chromium.

Adsorption and reduction of mercury are carried out.

with stirring, dissolving at three 1 cm temperature for 2 hours, the pH of the solutions is maintained (equal to –1.5 / randomly by removing small amounts of sodium acetate. For isolated and precipitated) mercury, the adsorbent 1 after washing is processed with 25% Н11 ipaicTBOpom ED | Who soda. Metallic l; Hg; mercury is separated from the sodium silicate solution and broken with eode. Analysis (solutions (waste) Showed the absence of mercury in them. The analysis of metallic mercury showed the absence of non-ferrous metal in it.

Example 2. Four times and 1 g of each of the synthesized modified adsorbents is poured with 2% solutions of mercuric acid nitrate, taken in an amount (exceeding the maximum capacity of adsorbents. In (standing (time is carried out for a day. For This time the equilibrium is established in the solutions.Then, the adsorbents are treated as described in Fig. 1. The obtained values of the adsorption capacity for mercury used for the adsorbents were g / g; silicon hydride 1,241.

Subject and title

The method of purification of pacTiBOpoB from mercury by adsorption, characterized in that, with the aim of increasing the degree of purification, and also its release directly (in a metallic form, silica substrates containing chlorosilanes are used in the adsorbent stone.