Method for recovering multiple metals from complex antimony-containing gold ore

A multi-metal and gold mining technology, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of secondary pollution, high energy consumption, and the need for pyrotechnics, etc., to achieve efficient recovery, reduce production costs, and reliable strong effect

Active Publication Date: 2017-11-07

NORTHWEST RES INST OF MINING & METALLURGY INST

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AI-Extracted Technical Summary

Problems solved by technology

Relevant researchers have proposed some treatment methods. The patent "a process for separating antimony and gold while smelting antimony" (CN104152721B) treats high-antimony concentrates with relatively high grades and almost only two elements, antimony and gold. Pyrotechnic process is required, which consumes a lot of energy; the patent "A New Process for Recovering Antimony from Antimony-Containing Gold Con...

Abstract

The invention discloses a method for recovering multiple metals from complex antimony-containing gold ore. The method comprises the following steps: after concentrated antimony-gold ore or tailings are dissolved by utilizing sodium sulphide or caustic soda flakes, introducing steam and oxygen into a leaching tank to dissolve the antimony in the ore in a leaching liquid; filtering, performing electrodepositing on the leaching liquid through an electrolyzing process, and separating the antimony in a cathode plate to obtain a raw antimony; recovering the antimony, performing a sodium sulphide removing regenerating process on the solution of which the antimony is recovered, and performing low-temperature crystallizing to obtain sodium sulphide nonahydrate crystals; refining the leached slag by adopting ball grinding; oxidizing and leaching by adopting high-temperature air; and performing a carbon-in-pulp process on the leaching liquid to obtain gold-loaded carbon, wherein the total recovering rate of the antimony and the gold reaches over 95 percent. The overall process is high in reliability; secondary pollution cannot be caused; the production cost is reduced; and environment-friendly clean production is realized.

Application Domain

Photography auxillary processesProcess efficiency improvement

Technology Topic

Carbon in pulpAntimony +14

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Examples

Experimental program(3)

Example Embodiment

[0015] Example 1

[0016] The antimony-containing gold concentrate contains 23.5% Sb, 65g/t Au and S21.5%.

[0017] Take 2t of gold concentrate containing antimony.

[0018] 1) Leaching: The antimony-containing gold concentrate is leached with 10% alkali solution (mixed with sodium sulfide and caustic soda), steam is heated to control the temperature at 75℃, the leaching reaction time is 1h, the alkali solution and the antimony-containing gold concentrate The mass ratio of ore powder is 0.5, oxygen or air is introduced during the leaching process, and the oxygen or air flow rate is 0.5m 3 /min, filter after leaching, send the filtrate to the electrowinning process, and send the filter residue to the gold extraction process;

[0019] 2) Electrowinning: Step 1) The filtrate produced by leaching is heated to about 40°C and transferred to the electrolysis cell for electrowinning. Antimony is deposited on the cathode steel plate, and the waste electrolyte produced by the electrowinning is sent to the crystallization process;

[0020] 3) Gold extraction: the filter residue of step 1) is refined by ball milling, the grinding fineness is -325 mesh accounting for 85%, and then it is sent to the leaching tank for leaching, and the air volume is controlled to be 0.06m 3 /min, temperature 30℃, time 6d, filter after leaching, the filtrate after filtration is passed through the carbon slurry method to obtain gold-loaded carbon, and the leaching residue is temporarily stored as tailings;

[0021] 4) Crystallization: Crystallize the waste electrolyte of step 2) at low temperature and control the temperature to 15°C to obtain sodium sulfide nonahydrate. The mother liquor is returned to the leaching process.

[0022] The mass concentration of gold leaching agent used for leaching in step 3) is 5%, and the mass ratio of thiourea: gold cicada agent is 0.3:1.

[0023] The calculated comprehensive yield is: antimony 95.7%, gold 95.2%, and sulfur 81.7%.

Example Embodiment

[0024] Example 2

[0025] The composition of antimony-containing gold concentrate is Sb35.5%, Au35g/t, S28.5%.

[0026] Take 2t of gold concentrate containing antimony.

[0027] 1) Leaching: The antimony-containing gold concentrate is leached with 35% sodium hydroxide solution, steam is heated to control the temperature at 90℃, the leaching reaction time is 2.5h, and the mass ratio of the alkali solution to the antimony-containing gold concentrate is 2. Oxygen or air is fed into the leaching process, the flow rate of oxygen or air is 1.5m 3 /min, filter after leaching, send the filtrate to the electrowinning process, and send the filter residue to the gold extraction process;

[0028] 2) Electrowinning: Step 1) The filtrate produced by the leaching is heated to about 50°C and transferred to the electrolytic cell for electrowinning. Antimony is deposited on the cathode steel plate, and the waste electrolyte produced by the electrowinning is sent to the crystallization process;

[0029] 3) Gold extraction: the filter residue of step 1) is refined by ball milling, the grinding fineness is -325 mesh accounting for 90%, and then it is sent to the leaching tank for leaching, and the air flow rate is controlled to 0.1m 3 /min, temperature 40℃, time 8d, filter after leaching, the filtrate after filtration is passed through the carbon slurry method to obtain gold-loaded carbon, and the leaching residue is temporarily stored as tailings;

[0030] 4) Crystallization: Crystallize the waste electrolyte of step 2) at low temperature and control the temperature to 18°C to obtain sodium sulfide nonahydrate. The mother liquor is returned to the leaching process.

[0031] Among them, in step 3), the mass concentration of the gold leaching agent used for leaching in the leaching tank is 15%, and the mass ratio of thiourea: gold cicada agent is 0.6:1.

[0032] The calculated comprehensive yield is: antimony 94.2%, gold 96.5%, and sulfur 76.6%.

Example Embodiment

[0033] Example 3

[0034] The composition of the antimony gold concentrate is Sb42.6%, Au185g/t, S16.5%.

[0035] Take 2t of gold concentrate containing antimony.

[0036] 1) Leaching: the antimony-containing gold concentrate is leached with 20% circulating alkali solution, steam is heated to control the temperature at 70℃, the leaching reaction time is 3h, and the mass ratio of the alkali solution to the antimony-containing gold concentrate is 3. Oxygen or air is introduced into the leaching process, and the flow rate of oxygen or air is 2m 3 /min, filter after leaching, send the filtrate to the electrowinning process, and send the filter residue to the gold extraction process;

[0037] 2) Electrowinning: Step 1) The filtrate produced by the leaching is heated to about 45°C, then transferred to the electrolytic cell for electrowinning, antimony is deposited on the cathode steel plate, and the waste electrolyte produced by the electrowinning is sent to the crystallization process;

[0038] 3) Gold extraction: the filter residue of step 1) is refined by ball milling, the grinding fineness is -325 mesh accounting for 95%, and then it is sent to the leaching tank for leaching, and the air flow rate is controlled to 0.2m 3 /min, temperature 50℃, time 10d, filter after leaching, the filtrate after filtration is passed through the carbon slurry method to obtain gold-loaded carbon, and the leaching residue is temporarily stored as tailings;

[0039] 4) Crystallization: Crystallize the waste electrolyte of step 2) at low temperature and control the temperature to 18°C to obtain sodium sulfide nonahydrate. The mother liquor is returned to the leaching process.

[0040] Among them, in step 3), the mass concentration of gold leaching agent used for leaching in the leaching tank is 25%, and the mass ratio of thiourea: gold cicada agent is 0.9:1.

[0041] The calculated comprehensive yield is 97.5% for antimony, 95.5% for gold, and 85.5% for sulfur.

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Method for recovering multiple metals from complex antimony-containing gold ore

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