CN101451192B - Comprehensive recovery method for directly cyanating and intensified leaching multi-metal gold ore concentrate - Google Patents
Comprehensive recovery method for directly cyanating and intensified leaching multi-metal gold ore concentrate Download PDFInfo
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- CN101451192B CN101451192B CN2007101805722A CN200710180572A CN101451192B CN 101451192 B CN101451192 B CN 101451192B CN 2007101805722 A CN2007101805722 A CN 2007101805722A CN 200710180572 A CN200710180572 A CN 200710180572A CN 101451192 B CN101451192 B CN 101451192B
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Abstract
The invention discloses a comprehensive recovery method for directly cyaniding, consolidating and leaching polymetallic gold concentrate, which comprises the following steps: after the gold concentrate is pulped, fractionated and grinded, qualified grinded and fractionated products are subjected to dehydration and reagent removal operation, and underflow is subjected to pre-alkaline leaching operation; pulp after alkaline leaching is subjected to alkaline leaching and pressure filtration; pulp after primary cyaniding leaching is subjected to primary washing, and 99.9 percent of finished products, namely gold ingots/silver ingots are produced; the underflow after primary washing is subjected to secondary leaching operation, and leached pulp is subjected to countercurrent washing; washed underflow pulp is subjected to pressure filtration; pulp after pulping is subjected to cyanide residue floatation operation, and gold lead concentrate, copper concentrate and sulfur concentrate are respectively recovered by floatation and taken as concentrate goods for sale; and tailings after floatation are subjected to pressure filtration and discharged as waste tailings. The method improves the recovery rate of difficulty leached gold concentrate to more than 96 percent, simultaneously reduces equipment investment, shortens the leaching technological flow, and reduces the metal overstock flow. The direct cyanidation recovery rate of gold reaches more than 96 percent, and the comprehensive recovery rate of the gold reaches more than 98 percent, so as to reach the advanced level in the same industry in China.
Description
Technical field
The present invention relates to the direct cyanating and intensified leaching comprehensive recovering process of a kind of multi-metal gold ore concentrate, belong to metallurgical technology field.
Background technology
Because the character complexity of part gold ore, be rich in copper, pyrrhotite etc., there is part subparticle parcel in disseminated grain size according to gold, and it is bigger to wrap up golden proportion, be rich in the pyrrhotite ratio and account for 13% with first-class situation, these gold ore adopt conventional cyaniding to leach operation, and leaching yield is lower, the experiment leaching yield is 85-90%, causes being difficult to cyaniding and leaches.Conventional cyaniding is leached in the operation needs to consume more prussiate, cyaniding smelting cost height, and gold leaching rate is low, causes a large amount of dischargings that contain cyaniding sewage in addition, and is seriously polluted to surrounding environment.In addition, existing Process for the cyanation can only leach gold or silver, and the cyanogen slag is directly discarded, promptly environment has been caused pollution, has taken a large amount of soils, again resource has been caused waste.
Summary of the invention
The object of the present invention is to provide the direct cyanating and intensified leaching comprehensive recovering process of a kind of multi-metal gold ore concentrate,, realize cyanogens-containing sewage water " zero release " to improve the rate of recovery.
To achieve these goals, technical scheme of the present invention has adopted a kind of self-produced gold ore or outsourcing gold ore, may further comprise the steps: after overtesting was joined the ore deposit, metering was taken a sample again with gold ore; Through size mixing, classification, ore grinding, qualified grind grading product is through dehydration reagent removal operation, underflow carries out pre-alkali and soaks operation; Alkali soaks the back ore pulp and carries out alkali compregnate filter, filter cake size mixing to concentration be 33-35%, add liquid sodium cyanide simultaneously, carry out a cyaniding and leach; A cyaniding is leached back ore pulp and is carried out once washing, after washings passes through secondary purification as your liquid, under the vacuum jet pump suction function, carry out deoxidation, add zinc powder then, enter the displacement operation, the gold mud of output send hydrometallurgy, the finished product ingot/silver ingot of output 99.9%; The underflow of once washing carries out secondary and leaches operation, and leaching the operation pulp density is 33-35%, and free cyanogen root concentration is controlled between the 30-50 ‰, and free calcium oxide concentration is controlled between the 3-5 ‰, and adding up to extraction time is 46-50 hour; The ore pulp that leaches carries out countercurrent washing, and its overflow water partly returns for once washing usefulness, and part is returned as the water of sizing mixing and used; The underflow ore pulp of washing is through press filtration, filter cake is assisted washing with the back flushing of displacement lean solution more than 5 minutes, filtrate returning reused, after the filter cake discharging, with the trace gold in the charcoal absorption liquid, the ore pulp after sizing mixing enters the operation of cyanogen slag flotation, respectively golden lead ore concentrate, copper ore concentrates and the sulphur concentrate of floatation recovery, sell outward as the concentrate commodity, flotation tailings discharges as discarded tailings after press filtration.
The coarse sand that described classification goes out returns and enters the closed circuit grinding circulation.
In the described process of sizing mixing, the alkali that returns with clear water and part embathes liquid as sizing mixing water.
Described qualified ore grinding is meant that fineness reaches-400 purposes and accounts for 90-95%.
Described your liquid is before displacement, need after pumping sheet frame and two sections purifications of purification tank, remove suspended solid wherein, after being removed dissolved oxygen by vacuum suction deoxidation tower again, add zinc powder and mix back pumping displacement plate-and-frame filter press, send smelting, full hydrometallurgy purification finished product gold/silver after the every first quarter moon dismounting of gold mud.
Described displacement lean solution is partly returned washing, and part is carried out the full acidifying of lean solution and reclaimed the sodium cyanide sewage disposal, and the liquid sodium cyanide Returning process of recovery, acidizing fluid return for the water use of sizing mixing of cyanogen slag flotation.
Described cyanogen slag flotation gold lead ore concentrate/copper ore concentrates/sulphur concentrate operation adopts flotation column to carry out the cyanogen slag flotation respectively, and product is golden lead ore concentrate/copper ore concentrates/sulphur concentrate.
Adopt pre-alkali to soak operation in the method for the present invention, being full of fine foam in the ore pulp causes dissolved oxygen amount to increase, reached the effect that oxygen enrichment leaches, a large amount of types of gas filled microbubbles has also been strengthened the stirring action of mineral grain simultaneously, pyrrhotite, sulphur, the arsenic generation chemical oxidation reaction of harm cyanide gold-leaching have been quickened, eliminate its harmful effect in the cyanide gold-leaching process, reduced NaCN consumption; The oxidizing reaction of sulphur, arsenic and pyrrhotite has also been destroyed the lattice of microfine parcel gold in the mineral simultaneously, makes it gold grain and comes out, and is easy to cyaniding and leaches.Soak operation through the pre-alkali of microvesicle oxidation: handle gold ore and improve the rate of recovery 2%, reach 96%; The processing primary ore recovery ratio has improved 5%, reaches 91%.Acidizing fluid returns and directly soaks gold ore, and the simultaneous test of clear water, lean solution and acidifying lean solution has been carried out in the laboratory, and the part gold ore leaches the impurity effect in the solution responsive especially, and the leaching yield when lean solution leaches is only about 87%; Produce relative clear water and leaching yield can be improved more than 1% and acidizing fluid directly soaks gold ore.Improve grinding fineness: it is closed circuit to adopt Φ 150 long awl swirlers and Φ 1.5 * 3.0m overflow ball mill to form during gold ore is regrinded and circulated, and replaces former placed in-line two Daeporis to lead to swirler, and under one section fractionated situation, fineness has reached-400 orders more than 95%.Adopt full acidization to handle lean solution Returning process again, realize cyanogens-containing sewage water " zero release ".Comprehensively reclaim newly-increased three products gold lead ore concentrate, copper ore concentrates, sulphur concentrate by the cyanogen slag flotation.Reach technical indicator respectively: golden lead ore concentrate operation recovery gold 45～51%, lead 80～85%, gold grade 20～25g/t, lead content 20%; Copper ore concentrates copper recovery 80～85%, copper content 15～25%; Sulphur concentrate sulfur recovery rate 80～85%, sulphur content 45%.The gold comprehensive recovery reaches more than 98%.Cyaniding tailing press filtration dry type is stored up, and has avoided the pollution that cyanogens-containing sewage water caused.Take press filtration sheet frame of your liquid to purify, the secondary-cleaned filter vat purifies, and clarifying your liquid has improved the quality of zinc dust precipitation gold mud, and gold mud contains gold and reaches 25～35%, smelts to gold mud and has created favourable condition.
Adopt method of the present invention that the refractory gold concentrate rate of recovery is brought up to more than 96%; Reduced facility investment simultaneously, shortened the extract technology flow process, reduced the metal flow process and overstock.The gold directly cyaniding rate of recovery has reached more than 96%, and comprehensive recovery has reached domestic advanced level of the same trade more than 98%.Handle the concentrate amount and reached 160 ton per days, than original increase by 100 ton per days, year can increase by 5237.64 ten thousand yuan of benefits.
Method of the present invention is applied in stockaded village's primary ore on the bridge:
The disseminated grain size of gold exists subparticle parcel to account for 15%, and wherein the gangue parcel contains pyrrhotite and accounts for 11%, and when grinding fineness-200 order 75%, so county's 300 ton per days select 2237 tons of the independent processing treatment of factory, index is as follows:
| Project | Ore deposit amount t | Go into to grind grade g/t | Gravity treatment grade g/t | Gravity treatment yield % | Overflow grade g/t | Concentrate grade g/t | Tailings grade g/t | Flotation yield % | Total yield % |
| Index | 2237 | 4.35 | 76.57 | 21.76 | 3.59 | 56.18 | 0.73 | 62.50 | 84.26 |
The ore dressing total yield only can reach 84.26%; These primary ores adopt conventional cyanidation technology to leach, experiment leaching yield 84-88%.
Adopt microvesicle oxidation leaching experiment leaching yield of the present invention can reach 90%.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
As shown in Figure 1, method of the present invention may further comprise the steps: self-produced gold ore or outsourcing gold ore enter stockyard, cyaniding smeltery after sampling is weighed in metering; Gold ore is after overtesting is joined the ore deposit, and metering is taken a sample again; Add Φ 1.5*2 and size mixing in the steel basin, the alkali that returns with clear water and part embathes the liquid water of sizing mixing, and the stirring ore pulp send Φ 200 cyclone classifications by the slag stock pump, and the swirler coarse sand returns Φ 1.5*3 ball mill and enters closed circuit grinding and circulate; Overflow fineness will reach-400 order 90-95%, and lime is also by adding in the ball mill; In the closed circuit flow process of ore grinding, qualified grind grading product enters 12 meters alkali of Φ and soaks the thickener reagent removal operation of dewatering; Thickener part overflow water returns the concentrate steel basin of sizing mixing as washing lotion; Thickener underflow is squeezed into 2 Φ 5*5PM microvesicle alkali oxide immersion troughs by the RGB65 hose pump and is carried out pre-alkali and soak operation, alkali soaks the back ore pulp, pumping enters the filter of alkali compregnate, filter cake feeds two-stage Φ 2*2.5 steel basin through Φ 750 worm conveyors and sizes mixing to concentration 33-35%, the hydromining of sizing mixing is washed inferior your liquid that Φ 15m thickener returns with two, add liquid sodium cyanide simultaneously, be pumped into 4 Φ 5*5.6PM microvesicle oxidation leaching vat and carry out cyaniding leaching; A cyaniding is leached the back ore pulp from flowing into 15 meters Hhigh-efficient thickeners of Φ, carries out once washing; Your liquid pool is washing lotion go into as your liquid pumps into 60m again
2Sheet frame and 40m
2Purification tank under the vacuum jet pump suction function, enters the deoxidation of Φ 1000*3000 deoxidation tower through after the secondary purification, adds zinc powder by Φ 140 zinc powder charging machines, enters the displacement operation, displacement sheet frame 40m
2, the every first quarter moon of the gold mud of output send hydrometallurgy, the finished product gold/silver ingot of output 99.9%; The underflow of once washing thickener is sent into 4 Φ 5*5.6PM microvesicle oxidation leaching vat by the RGB65 hose pump and is carried out secondary leaching operation; Leach operation pulp density 33-35%, free cyanogen root concentration is controlled at 30-50 ‰, and free calcium oxide concentration is controlled at 3-5 ‰, adds up to extraction time 48 hours.The leaching ore pulp is gone into Φ 12m individual layer+double-deck Φ 7m washing thickener by the slag stock pump and is carried out countercurrent washing, and its overflow water partly returns the once washing thickener, and part is returned as the water of sizing mixing and used; Φ 7m washing thickener underflow ore pulp send XZY150m with the slag stock pump
2Pressure filter, the press filtration filter cake is assisted washing with the back flushing of displacement lean solution more than 5 minutes, filtrate is returned Φ 7m washing thickener, enter Φ 750 worm conveyors and the two-stage Φ 1.5*1.5 steel basin of sizing mixing after the filter cake discharging, and with the trace gold in the charcoal absorption liquid, ore pulp after sizing mixing enters the operation of cyanogen slag flotation, and floatation recovery gold and silver, lead/copper/elements such as sulphur are sold outward as concentrate; Store up as discarded tailings outward transport dry type after the flotation tailings press filtration.
It should be noted last that: above embodiment is only in order to explanation, and unrestricted technical scheme of the present invention, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. the direct cyanating and intensified leaching comprehensive recovering process of multi-metal gold ore concentrate is characterized in that: may further comprise the steps: gold ore after overtesting is joined the ore deposit, is measured sampling again; Through size mixing, classification, ore grinding, qualified grind grading product is through dehydration reagent removal operation, underflow carries out pre-alkali and soaks operation; Alkali soaks the back ore pulp and carries out alkali compregnate filter, filter cake size mixing to concentration be 33-35%, add liquid sodium cyanide simultaneously, carry out a cyaniding and leach; A cyaniding is leached back ore pulp and is carried out once washing, after washings passes through secondary purification as your liquid, under the vacuum jet pump suction function, carry out deoxidation, add zinc powder then, enter the displacement operation, the gold mud of output send hydrometallurgy, the finished product ingot/silver ingot of output 99.9%; The underflow of once washing carries out secondary and leaches operation, and leaching the operation pulp density is 33-35%, and free cyanogen root concentration is controlled between the 30-50 ‰, and free calcium oxide concentration is controlled between the 3-5 ‰, and adding up to extraction time is 46-50 hour; The ore pulp that leaches carries out countercurrent washing, and its overflow water partly returns for once washing usefulness, and part is returned as the water of sizing mixing and used; The underflow ore pulp of washing is through press filtration, filter cake is assisted washing with the back flushing of displacement lean solution more than 5 minutes, filtrate returning reused, after the filter cake discharging, with the trace gold in the charcoal absorption liquid, the ore pulp after sizing mixing enters the operation of cyanogen slag flotation, respectively golden lead ore concentrate, copper ore concentrates and the sulphur concentrate of floatation recovery, sell outward as the concentrate commodity, flotation tailings discharges as discarded tailings after press filtration.
2. the direct cyanating and intensified leaching comprehensive recovering process of multi-metal gold ore concentrate according to claim 1 is characterized in that: the coarse sand that classification goes out returns and enters the closed circuit grinding circulation.
3. the direct cyanating and intensified leaching comprehensive recovering process of multi-metal gold ore concentrate according to claim 1 is characterized in that: in the described process of sizing mixing, the alkali that returns with clear water and part embathes liquid as sizing mixing water.
4. the direct cyanating and intensified leaching comprehensive recovering process of multi-metal gold ore concentrate according to claim 1 is characterized in that: qualified ore grinding is meant that fineness reaches-400 purposes and accounts for 90-95%.
5. the direct cyanating and intensified leaching comprehensive recovering process of multi-metal gold ore concentrate according to claim 1, it is characterized in that: described your liquid is before displacement, need after pumping sheet frame and two sections purifications of purification tank, remove suspended solid wherein, after being removed dissolved oxygen by vacuum suction deoxidation tower again, add zinc powder and mix back pumping displacement plate-and-frame filter press, send smelting, full hydrometallurgy purification finished product gold/silver after the every first quarter moon dismounting of gold mud.
6. the direct cyanating and intensified leaching comprehensive recovering process of multi-metal gold ore concentrate according to claim 1, it is characterized in that: described displacement lean solution is partly returned washing, part is carried out the full acidifying of lean solution and is reclaimed the sodium cyanide sewage disposal, the liquid sodium cyanide Returning process that reclaims, acidizing fluid return for the water use of sizing mixing of cyanogen slag flotation.
7. the direct cyanating and intensified leaching comprehensive recovering process of multi-metal gold ore concentrate according to claim 1, it is characterized in that: described cyanogen slag flotation gold lead ore concentrate/copper ore concentrates/sulphur concentrate operation, adopt flotation column to carry out the cyanogen slag flotation respectively, product is golden lead ore concentrate/copper ore concentrates/sulphur concentrate.
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| CN112251614A (en) * | 2020-11-18 | 2021-01-22 | 云南黄金矿业集团股份有限公司 | Method for efficiently extracting gold and silver from gold-containing silver-sulfur concentrate |
| CN112442601A (en) * | 2020-12-08 | 2021-03-05 | 山东黄金归来庄矿业有限公司 | Process for improving leaching rate of carbon-containing tellurium-containing refractory limestone type gold ore |
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| CN113736997B (en) * | 2021-09-07 | 2023-05-02 | 山东国大黄金股份有限公司 | Method for recycling gold and silver through sulfuric acid synergistic treatment cyanide tailings decyanation flotation |
| CN115261635B (en) * | 2022-08-01 | 2024-01-16 | 西安矿源有色冶金研究院有限公司 | Comprehensive recycling method for high-grade multi-element gold concentrate |
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