SU1678878A1 - Process for desmercurization of surfaces - Google Patents

Abstract

The invention relates to the metallurgy of non-ferrous metals and can be used in protecting the air of the working area from mercury vapor. The purpose of the invention is to reduce air pollution with mercury vapor. The method involves treating surfaces contaminated with mercury with an aqueous solution of titanium chloride chloride waste with the addition of a surfactant. Next, the surface is additionally treated with an aqueous suspension of cakes, water treatment facilities of titanium-magnesium production, containing 15-25 wt.% Dry matter of the following composition,%: CaCoS 50.0-59.0; CaO 5.5-6.0; TiO2 6.0-6.7; Re203 7.6-8.9; SI02 4.2-8.9; MgO 5.6-7.3; AlaOs 3.6.-4.8; CaSO 1,9-3,1; carbon 0.5-1.4; sodium and potassium hydroxides - the rest. 1 tab.

Description

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The invention relates to the metallurgy of non-ferrous metals and can be used in protecting the air of the working area from mercury vapor.

The aim of the invention is to reduce air pollution with mercury vapor.

Example (by a known method). A 15% solution of chloride waste with the addition of 3% surfactant is prepared and the contaminated surface is treated with an initial mercury concentration in the air of 1.85 mg / m3. The concentration of mercury vapor is measured at certain time intervals: after 1; 2; 10 days., As well as 1, 2. 3 and 6 months.

The results of the definitions are summarized in the table.

PRI me R 2 (the proposed method). The mercury-contaminated surface at a concentration of mercury vapor in the air of 1.85 mg / m3 is treated with chloride waste as in Example 1. After the film dries, the surface is further treated with an aqueous suspension of a water treatment plant of the titanium-magnesium plant with different dry matter content (12-28%). The chemical composition of these cakes is as follows. %: CAS02 50.0-59.0; CaO 5.5-6.0; Tua 6.0-6.7; ReaOz 7.6-8,9; SiOa 4.2-8.9; MgO 5.6-7.3; 3.6-4.8; CuS04 1.9- 3.1%; carbon 0.5-1.4. sodium and potassium hydroxide balance the rest. During those periods of time, as well as by a known method, the concentration of mercury vapor in the air is measured.

The use of the proposed method in comparison with the known method makes it possible to increase the reliability of the method by increasing the os VI 00 00 VI CO

Neither the duration of the reagent - destrucator. The maximum permissible concentration of mercury vapor in the air is 0.01 mg / m3 by a known method is reached 2 months later, and by the proposed method 6 months after treatment. In addition, when using the proposed method, the corrosion rate of the treated metal surfaces is reduced by a factor of 16 due to the inhibitory ability of cakes. The advantages of the proposed method should also include the possibility of waste disposal: cakes water treatment facilities titanium-magnesium production.

Claims (1)

The invention of the method of demercurization of surfaces, including their treatment Kekl concentration,% The initial concentration of mouth-, mg / m3 Mercury concentration, kg / m, after a period of time 1.85 2.05 It is an intuitive way 0.3I.O.I.O. Go to ft Oh, O.O.I.o. 0,,,, 15 0 five a solution of titanium chloride chloride wastes with the addition of a surfactant, distinguished by the fact that, in order to reduce air pollution with mercury vapors, the surface is additionally treated with an aqueous suspension of titanium – magnesium wastewater treatment plants containing 15–25% (by weight) dry substances of the following composition,%; calcium carbonate 50.0- 59.0, calcium oxide 5.5-6.0, titanium dioxide 6.0-6.7, ferric oxide 7.6- 8.9, silica 4.2-8.9, oxide magnesium, 5.6-7.3; trivalent aluminum oxide, 3.6-4.8; calcium sulfate, 1.9-3.1; carbon, 0.5-1.4; sodium and potassium hydroxides, the rest. 0.002 0.01 0.03 0.12 0.007 0.006 0.01 I.O.I.O.I. 0.012 0.08 , 06 , 01 0.008 0.008 0012