SU960290A1 - Method for purifying ore from impurities - Google Patents

Description

The invention relates to the metallurgy of non-ferrous metals, namely to the process of purification of metallic mercury from impurities.

; A known method for purifying mercury by washing it with solutions that oxidize or: convert ghrimesi into forms that can be removed with washing solution 1}.

The disadvantages of this method are large; loss of mercury rushing in; saline liquid waste to be compulsory deep cleaning and disposal ....

The closest in technical essence and the achieved result is the method of purification of mercury from impurities, including filtration and subsequent washing of mercury with an aqueous solution of hydrogen peroxide 2.

The disadvantages of the well-known method are the increased costs of hydrogen peroxide (the use of solutions with hydrogen peroxide content of 0.3 to 2.5 May.%), The need to use a purified solution of water purified on ion exchangers, a high content of mercury in the cleaning solution ( i.e. its large losses (up to 0.03%), the need to use special pumps and reactors for thin emulsification of purified mercury for cleaning, the need to maintain the pH in the cleaning process within 5-11.

The aim of the invention is to reduce mercury contamination of the washing solution and reduce the consumption of hydrogen peroxide.

ten

This goal is achieved by the fact that according to the method of purification of mercury from impurities, including filtration through filtering material and the subsequent washing of mercury with an aqueous solution of hydrogen peroxide, 1,3-dioxolane in the amount of 0.5-3.0 weight. h per 1000 weight parts cleaning solution.

Example. 100 g of metal

20 mercury containing calcined residue (defined in accordance with GOST 4658-73), 0.0845 wt.% Is filtered through filter paper and 100 g of mercury are obtained containing 25.444 wt.% Of the calcined residue.

100 g of filtered mercury, as indicated above, is placed in a flasher equipped with a paddle stirrer, making 250-400 revolutions per minute, is poured over with a washing solution and stirred for 15 minutes. After that, the washing solution is drained and the mercury is washed with water. For the preparation of the cleaning solution, steam condensate, technical perhydrol according to GOST 177-77 and formalglycol (1,3-dioxolane) are used; according to TU-6-02-971-74.

The cleaning results are monitored by the content of the calcined residue in the purified mercury and are given together with the compositions of the cleaning solutions in the table. The same table shows the comparative data when using the cleaning solution according to known.

In all experiments, purification was carried out at normal pressure and room temperature.

The advantages of the proposed mercury purification method compared to the known method are that, with the same purification efficiency, the consumption of hydrogen peroxide is reduced three times; mercury content in the spent cleaning solution is reduced by 3-30 times.

It should be noted that in mercury purification of the spent purification solution and rinsing water by treating with excess sodium sulfide in all experiments, they are purified (solution and rinse water) to a mercury content less than the established maximum permissible concentrations.

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Claims (2)

200 200 200 200 200 The claims 1. A method for purifying mercury from impurities, including filtering through filtering material and the subsequent propelling of mercury with a solution of hydrogen peroxide, which is 0, 05 0.09 0.65 6.00 0.50 The same 0.20 0.05 0.40 0.20 0.80 0.15 0.20 0.07 0,00010, 20 0.10 0.10 0.10 0.0002 2.00 0.75 It is absent for the reason that, in order to decrease the Mercury knowledge of the washing solution and the reduced consumption of hydrogen peroxide, 1.43-dioxolane is additionally added to the solution. 2. The method according to p. 1, about t l and h a W and, and the fact that the promising solution 5 contains 1,3-dioxolane in an amount of 0.5-3.0 weight.h, per 1000 weight.h. cleansing solution, Sources of information taken into account in the examination 9602904 1..Melnikov S.M. Metallurgists of mercury. M., Metallurgists, 1971, p. 315-328. 2. Patent of England No. 1549520, CL- 22 b 43/00, 1979.