RU201651U1 - DEVICE FOR EXTRACTING GOLD FROM BROWN AND STONE COALS - Google Patents

Abstract

The utility model relates to the extraction of gold from brown and bituminous coals by a hydrometallurgical method. The device contains a hollow steel cylinder with a blind bottom, in the upper part of which, by means of a thread, a cover with a sealing gasket under it and a vertical branch pipe on the outside with a silicone tube located on the branch pipe is sealed. The lower end of the silicone tube is made with the possibility of dropping into a glass with a sorbent for the possibility of condensation of steam with gold. In the middle of the inner volume of the steel cylinder, a mesh with 1 mm holes is fixed. In this case, the steel cylinder is made with the possibility of placing it in a thermostat. The valve stem is located in the branch pipe, made with the possibility of free vertical movement, the upper part of which has a conical expansion with the possibility of supporting on the tapered bore of the valve seat, which is the upper end of the branch pipe, and removable calibrated weights are installed at the lower end. The device allows to increase the intensity of the process of extracting gold from coal. 1 ill.

Description

The utility model relates to mining, namely to devices for the hydrometallurgical extraction of gold from brown and bituminous coals.

There is a known method of extracting gold from natural brown and bituminous coals, in which water vapor is passed from below through a layer of coal placed on a grate, obtained by heating water poured into the space under the grate [RF Patent No. 2634835, priority dated June 14, 2016 No. ]

The proposed device for implementing the method has a significant drawback, which is that the temperature of the steam leaving the branch pipe in the reactor lid cannot rise above 100 ° C, due to the fact that there is then an open space after the silicone tube that directs the steam into the container for steam condensation. This movement of the steam current does not allow the use of pressure and temperature for the reaction of steam with coal, and does not make it possible to more completely separate the organo-gold substances formed on coal during the reaction with humic acids.

The technical problem solved by this utility model is to create a device for implementing the method according to patent No. 2634835, which makes it possible to extract gold with greater intensity from brown and bituminous coals without disturbing the mineralogical and chemical composition of the coal, without losing its energy value by coal, and at the same time with preservation of the technological chain for burning coal in industrial furnaces, which corresponds to the tasks of associated extraction.

The essence of the utility model is that in a device for extracting gold from brown and bituminous coals, which includes a hollow steel cylinder with a blind bottom, in the upper part of which, by means of a thread, a cover with a sealing gasket under it and a vertical pipe on the outside is sealed , with a silicone tube located on the branch pipe, the lower end of which is lowered into a glass with a sorbent for processing condensate of steam with gold, and a mesh with 1 mm holes is fixed in the middle of the inner volume of the steel cylinder, while the steel cylinder itself is placed in a thermostat, in the branch pipe is located with the possibility of free vertical movement of the valve stem, the upper part of which has a conical expansion with the possibility of supporting on the conical bore of the valve seat, which is the upper end of the branch pipe, and removable calibrated weights are installed at the lower end.

Those. the device according to the patent No. 2634835 is supplemented by a vertical steam valve installed in the branch pipe of the reactor lid at the outlet of the steam flow from the reactor to the silicone hose.

The device is shown in FIG. 1 - Diagram of a laboratory setup of a reactor with a vertical steam valve.

The installation consists of the following parts:

1. Silicone hose; 2. Vertical valve stem; 3. Reactor cover branch pipe with seat for valve stem; 4. Working cylinder of the reactor; 5. Glass with sorbent for steam condensate with gold; 6. Water for vaporization; 7. A layer of coal for extracting gold from it, located on a metal grid; 8. Removable calibrated weights; 9. Sealing gasket under the cover; 10. Wall of the thermostat.

The valve stem 2 in the branch pipe of the cover 3 moves freely in the vertical direction. In the upper part of the stem there is a conical expansion, with which the stem rests on the conical bore of the valve seat - the upper part of the nozzle. In this case, the weights 8 create a force that must be applied by the steam under the conical expansion of the valve stem in order for a portion of steam to enter the hose and then go to condensation. In this case, an alternately increased pressure and steam temperature are created in the reactor, which are replaced by the return of these parameters to their original values. The number of weights installed on the rod determines the maximum steam pressure in the reactor and, accordingly, the periodic increase in the steam temperature in the reactor. The stroke is ~ 1 mm.

Several comparative experiments on the extraction of gold from coal were carried out in a laboratory setup, supplemented by the installation of a vertical steam valve. Previous studies have found that coals of different deposits and different storage periods behave differently. Coals from the Kansk-Achinsky coal basin, called Krasnoyarsk coals, local coals of the Amur region were tested: Erkovetsky coals, Raichikhinsky coals. Thus, Krasnoyarsk coals show the highest recovery rates in a conventional unit without a steam valve - up to 40% of gold recovery from the original grade. But these indicators are only for fresh coal extracted from the bottomhole. For stale coals, the indicators drop sharply to 10%. Local coals, in particular Erkovetskie, in a unit without a steam valve give consistently low rates of 10% and below. However, the use of a vertical steam valve in the installation dramatically raises the rate of gold recovery: from Erkovetsky coals up to 50%, from stale Krasnoyarsk coals up to 45%. In this case, weights were used on the rod of only 20 g, which raised the pressure in the reactor to no more than 1.2 atm. Even higher values are to be expected in larger high-pressure plants.

The technical result of using a vertical steam valve is the possibility of extracting gold directly from coal of various grades and various storage periods after mining, as well as its further use as an energy raw material, since the valve creates a pulsating pressure and temperature in the reactor cavity, which significantly increases the intensity of the process and final indicators for gold recovery.

Claims (1)

A device for extracting gold from brown and bituminous coals, containing a hollow steel cylinder with a blind bottom, in the upper part of which, by means of a thread, a cover with a sealing gasket under it and a vertical branch pipe on the outside is sealed, with a silicone tube located on the branch pipe, the lower end of which made with the possibility of lowering into a glass with a sorbent for the possibility of condensation of steam with gold, in the middle of the inner volume of the steel cylinder a mesh with 1 mm holes is fixed, while the steel cylinder is made with the possibility of placing it in a thermostat, characterized in that the valve stem is located in the branch pipe, made with the possibility of free vertical movement, the upper part of which has a conical expansion with the possibility of supporting on the conical bore of the valve seat, which is the upper end of the branch pipe, and removable calibrated weights are installed at the lower end.

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