RU2395597C2 - Procedure for extracting gold from coal and installation for implementation of this procedure - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: group of inventions refers to procedure for extracting gold from coal and to installation for its implementation. The procedure consists in combusting coal and in supplying fumes to a receiver-reactor with liquid in form of acidic flushing absorbing solution. Also fumes are preliminary purified, cooled and compressed to 6 at. Fumes are supplied, while pressure in the receiver-reactor is maintained at 4 at and there is sprayed acidic flushing absorbing solution. Further liquid is run though sorbent. The installation for extracting gold from coal consists of a furnace for coal combustion, of a cyclone, filter, water refrigerator, compressor, and receiver, receiver-reactor with injecting nozzle, branch, tap and safety valve, column with sorbent, reservoir for collection of absorbing flushing solution and a reservoir for drain of gold-free solution. All components of the installation are interconnected by pipes.

EFFECT: increased extraction of gold from coal.

2 cl, 1 dwg, 1 ex

Description

The invention relates to mining, and in particular to devices and methods for extracting gold from natural organic raw materials.

A device is known for extracting gold from gold-containing natural brown and hard coals, in which a container with water, a column with a sorbent, through which the flue gases resulting from burning coal in a quartz tube with air blowing and with a spiral are passed, are successively installed / RF patent No. 2249054 publ. 03/27/2005, bull. No. 9 /. This device is used as a prototype.

The disadvantage of this device is that it does not ensure the completeness of gold recovery, and the gold content in the final products of capture is not enough for industrial use of the device.

The objective of the invention is to provide a device for the extraction of gold from natural organic gold-containing raw materials, such as lignite and coal, which would provide a high concentration of gold in the final products and the full capture of gold, which will allow for industrial use of the device.

The invention consists in that a device for extracting gold from coal, including a furnace for burning coal and producing flue gases, a container with a liquid for washing gases with absorption of gold, a column with a sorbent, further comprises a cyclone and a filter for cleaning gases, a water cooler, a compressor and a receiver for compressing purified and cooled flue gases, a valve and a safety valve located after the receiver and providing a pressure in the receiver of 6 atm, two containers for collecting the absorbing wash solution and willow of desalted solution, and as a container with liquid, a receiver-reactor is used with an ejector nozzle in the lower part, a nozzle with a tap and a safety valve providing a pressure of 4 atm in the receiver-reactor located in the upper part of the receiver-reactor, all of which are device aggregates are interconnected into the system using pipes.

And in the method of extracting gold from coal, including burning raw materials, capturing sublimates by passing gases through a container with liquid, and then liquid through a sorbent, after burning, flue gases are purified, cooled, compressed to 6 atm and fed through an ejector to the receiver-reactor, moreover, the capture of gold occurs by maintaining a pressure of 4 atm in the reactor and spraying the liquid in the form of an acidic wash absorbing solution contained in the receiver-reactor.

The invention is presented in the drawing - a device for the extraction of gold.

The device is a series of units connected to the system and consists of a furnace 1, a cyclone 2, a water cooler 3, a filter 4, a compressor 5, a receiver 6, a crane and a safety valve 7, a receiver-reactor 8, an ejector nozzle 9, and an exhaust pipe with a tap and a safety valve for discharging exhaust flue gases 10, containers for draining the wash absorbing solution 11, columns with a sorbent 12, tanks for draining the anhydrous solution 13.

The device operates as follows. To obtain flue gases in the furnace 1, coal is burned. Flue gases are subsequently sucked through cyclone 2, where solid particles are removed, a water cooler 3 and a filter 4, where drops of coal tar are trapped. Next, the flue gas enters the suction nozzles of the compressor 5 and is pumped under pressure into the receiver 6. At the outlet of the receiver 6, a valve and a safety valve 7 are installed. Next, the gases through the ejector nozzle 9 enter the receiver-reactor 8, in which, as in the reactor, gas contact with the wash absorbing solution. The washing absorption solution is preliminarily poured into the lower part of the receiver-reactor 8. The solution is ejected into the receiver-reactor volume by ejection and always hangs in the form of fog from fine sprays, which creates favorable conditions for the solution to contact with gases and absorb volatile gold compounds. Then the washed, exhaust gases are removed through the exhaust pipe 10, located in the upper part of the receiver-reactor 8, and also through this pipe there is a discharge into the tank 11 of the washing absorbing solution that got together with the gases. The washing absorption solution, as soon as a sufficient concentration of gold has accumulated in it, is pumped into a container 11, from which it enters the columns with sorbent 12. As it saturates, the sorbent is sent for processing in order to obtain metallic gold. The misfolded solution is poured into the tank 13, reinforced with the necessary reagents and poured into the receiver-reactor.

Example. To obtain flue gases in a furnace 1, brown coal samples were burned from one of the deposits in the Krasnoyarsk Territory. A preliminary analysis found the gold content of 8-10 g / t. Coal was burned in portions of 1 kg. Heating to the ignition temperature of coal was carried out with carborundum heaters. With the beginning of combustion, the heaters turned off and on a C-415 M brand compressor with a capacity of 0.63 m / min and a receiver capacity of 230 l. Flue gases were sucked in sequentially through a cyclone, a water cooler, a filter and entered the compressor suction pipes and were pumped into the receiver, where they were compressed to 6 atm. At the outlet of the receiver there is a crane and a safety valve adjusted to 6 atm. Then the gases entered the receiver-reactor through the ejection nozzle. A pressure of 4 atm was maintained in the receiver-reactor due to the valve at the outlet of the receiver-reactor. In the lower part of the receiver-reactor (diameter 0.7 m, height 3 m, capacity 1 m ³ ) 200 l of the wash absorbing solution was poured. With a pressure difference of 2 atm, the gas velocity through the ejector nozzle is rather high, about 50 m / s, therefore, the solution was sprayed into the receiver-reactor volume by ejection. As a result, the solution was in contact with gases under increased pressure at a large gas-liquid interface created by intensive spraying of the solution from the ejector nozzle.

Within 6 hours, 12 kg of coal was burned in an oven. After that, analyzes of the obtained products were carried out: wash absorbing solution, ash from burnt coal. The analysis established:

1) the gold concentration in the solution is 0.73 mg / l, which is 145 mg of gold, or 12.08 g / t of coal per 200 l of solution;

2) the content in gold ash is 0.5 g / t.

Thus, the estimated gold grade in coal is 12.58 g / t.

Recovery in solution is 96.025%.

Extraction in ash - 3.975%.

The technical result of the use of the invention is to obtain highly concentrated gold recovery products, which contributes to a more complete extraction of gold from organic gold-containing raw materials.

Claims (2)

1. A method of extracting gold from coal, including burning coal, supplying flue gases through a container with a wash absorbing solution to absorb sublimates of gold, passing liquid through a sorbent, characterized in that after burning coal, flue gases are cleaned, cooled, compressed to 6 atm in a receiver and they are fed through an ejector nozzle into a container in the form of a receiver reactor with an acidic wash absorbent solution while maintaining a pressure of 4 atm and spraying an acidic wash absorbent solution. 2. A device for extracting gold from coal, containing a furnace for burning coal to produce flue gases, a container with an acidic wash absorbing solution for absorbing gold sublimates, a sorbent column, characterized in that it contains a cyclone and a gas filter, a water cooler, a compressor and receiver for compressing purified and cooled flue gases up to 6 atm with a valve and a faucet, a container for collecting an absorbent washing solution and a container for draining an anhydrous solution, while a container with an acid washing wash itelnym solution is designed as a reactor tank with izhektornoy nozzle at the bottom and near the top of pipe, cock and a safety valve, maintains the pressure of 4 atm, all units included in the apparatus are interconnected by pipes.