CN101028612B - Closed-circuit method for improving refractory gold ore concentrate quality and recovery rate - Google Patents
Closed-circuit method for improving refractory gold ore concentrate quality and recovery rate Download PDFInfo
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- CN101028612B CN101028612B CN2007100087880A CN200710008788A CN101028612B CN 101028612 B CN101028612 B CN 101028612B CN 2007100087880 A CN2007100087880 A CN 2007100087880A CN 200710008788 A CN200710008788 A CN 200710008788A CN 101028612 B CN101028612 B CN 101028612B
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Abstract
The invention relates to a closed-loop method for improving the gold concentrate grade and recovery rate of refractory gold ores, especially for the flotation of micro-fine particle type gold ores. The method adds sodium pyrophosphate with a molecular formula of Na4P2O7.10H2O and with a weight of 0.1-0.3% based on the crude ore weight in a primary coarse separation and a primary fine separation processes, and especially comprises the following steps: 1. dissolving the powdery or granular sodium pyrophosphate with the molecular formula of Na4P2O7.10H2O by using water into the gold ore difficult to dress to increase the sodium pyrophosphate water solution; 2. in the primary coarse separation adding the sodium pyrophosphate water solution into the crude ore slurry and stirring; 3. in the primary fine separation adding the sodium pyrophosphate water solution into the gold concentrate after the primary coarse separation and the gold concentrate after the primary coarse separation and secondary coarse separation and stirring; 4. in the secondary coarse separation performing secondary fine separation to the gold concentrate after the primary fine separation, and selecting the final product of gold concentrate ore; 5. re-separating in a closed-loop manner, respectively returning the tailings after the secondary fine separation and the tailings after the primary fine separation to the step 3 and 2. The method of the invention has characteristics of wide source of inhibitor, high efficiency, innocuity, good selectivity, environment-friendly of the treatment process and the treated tailings and high grade of the gold concentrate and high recovery rate and the like.
Description
One. technical field
The present invention relates to a kind of closed-circuit method that improves the refractory gold ore concentrate quality and the rate of recovery.
Two. background technology
Along with world's gold output constantly increases year after year, the occurring in nature free-milling ore is fewer and feweri, and extracting gold from from refractory gold ore becomes inexorable trend.
Refractory gold ore character is very complicated, and the one, gold is the submicroscopic shape and is distributed in multiple year gold mineral; The 2nd, gangue mineral is of a great variety, and existing silicate, aluminium silicate mineral contain carbonate mineral again; The 3rd, contain the clay mineral of easy argillization.These unfavorable factors have a strong impact on mineral processing index.Common way is to adopt lime, waterglass, prodan, cyanide etc. to carry out flotation as inhibitor.Lime is mainly as pyritous inhibitor in the gold ore, but it also has inhibitory action to gold mineral; Waterglass is mainly as silicate and other gangue mineral inhibitor, but it is not good enough to carbonate mineral and aluminium silicate mineral inhibition effect; Cyanide is mainly as metal sulfide and pyrite inhibitor, but it also has had strong inhibitory effects and energy dissolve gold to gold, causes gold to be lost in the mine tailing, and its toxicity also has serious environmental issue.In addition, adopt organic matter to be used as inhibitor in addition, but because of originating limited or price is more expensive or it is undesirable to suppress effect, at present the less commercial Application that obtains.For example, stockaded village, northeast, China Sichuan gold mine is a super-huge gold mine, but be the extremely unmanageable rich arsenic charcoal microfine type gold mine of generally acknowledging both at home and abroad, domestic some authoritative institution once carried out float test to it: in case Gold Concentrate under Normal Pressure grade 18～20 gram/tons that obtain, then the rate of recovery about 90%; If the Gold Concentrate under Normal Pressure grade is brought up to 25 gram/tons, then the rate of recovery drops to about 75%, and the Gold Concentrate under Normal Pressure grade and the rate of recovery of refractory gold ore are improved jointly.The large-scale gold mine company of several families of state such as the U.S., Canada looks on the bright side of things and sends out this ore deposit and the test of sampling, because the mineral processing index of test is not good, finally has to abandon this plan.
Therefore seek a kind ofly can improve the effective ways that refractory gold ore concentrate quality can improve the refractory gold ore rate of recovery again, have crucial meaning.
Three. summary of the invention
The purpose of this invention is to provide a kind of closed-circuit method that improves the refractory gold ore concentrate quality and the rate of recovery, can improve the Gold Concentrate under Normal Pressure grade of refractory gold ore effectively, can improve the rate of recovery of refractory gold ore again effectively.
For realizing above purpose, the closed-circuit method that improves the refractory gold ore concentrate quality and the rate of recovery is to add sodium pyrophosphate respectively in one roughing, primary cleaning operation, specifically may further comprise the steps:
(1) be Na with molecular formula
4P
2O
710H
2The powdery of O or graininess sodium pyrophosphate and raw ore 0.1～0.3% water by weight percentage are dissolved into the sodium pyrophosphate aqueous solution;
(2) one roughing adds raw ore slurry with the sodium pyrophosphate aqueous solution and stirs evenly, and carries out one roughing;
(3) primary cleaning adds the Gold Concentrate under Normal Pressure of one roughing and the Gold Concentrate under Normal Pressure of roughly selecting through one roughing, secondary with the sodium pyrophosphate aqueous solution and stirs evenly, and carries out primary cleaning;
(4) recleaning carries out recleaning with the Gold Concentrate under Normal Pressure of primary cleaning, sub-elects the mine tailing and the final products Gold Concentrate under Normal Pressure of recleaning;
(5) closed circuit final election, the mine tailing of recleaning is returned primary cleaning (3) to be formed one of closed circuit, the Gold Concentrate under Normal Pressure of the mine tailing of primary cleaning and once purging selection is returned one roughing (2) form closed circuitly two, the Gold Concentrate under Normal Pressure that secondary is scanned is returned once purging selection and is formed closed circuit three.
The molecular formula that can be used as inhibitor of the present invention is Na
4P
2O
710H
2The sodium pyrophosphate of O is the Inorganic Chemicals that market is easily purchased, and the compounding method and the applying method in the technological process of itself and water also are well-known in the selecting and smelting technology field.
Be used for inhibitor of the present invention also molecular formula be (NaPO
3)
6Inorganic Chemicals such as calgon, though this a kind of Inorganic Chemicals molecular structure is variant, effect is preferably arranged also.
Advantage of the present invention:
1. the inhibitor source is wide, efficient, nontoxic, selectivity is good.
2. the mine tailing of processing procedure and processing is environmentally friendly.
3. the Gold Concentrate under Normal Pressure grade and the rate of recovery selected are all high.
Four. description of drawings
Fig. 1 is a kind of closed-circuit method process chart that improves the refractory gold ore concentrate quality and the rate of recovery that proposes according to the present invention.
Five. the specific embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail:
Realizing this a kind of closed-circuit method that improves the refractory gold ore concentrate quality and the rate of recovery, is to add sodium pyrophosphate respectively in one roughing, primary cleaning operation, specifically may further comprise the steps:
(1) be Na with molecular formula
4P
2O
710H
2The powdery of O or graininess sodium pyrophosphate and raw ore 0.1～0.3% water by weight percentage are dissolved into the sodium pyrophosphate aqueous solution;
(2) one roughing adds raw ore slurry with the sodium pyrophosphate aqueous solution and stirs evenly, and carries out one roughing;
(3) primary cleaning adds the Gold Concentrate under Normal Pressure of one roughing and the Gold Concentrate under Normal Pressure of roughly selecting through one roughing, secondary with the sodium pyrophosphate aqueous solution and stirs evenly, and carries out primary cleaning;
(4) recleaning carries out recleaning with the Gold Concentrate under Normal Pressure of primary cleaning, sub-elects the mine tailing and the final products Gold Concentrate under Normal Pressure of recleaning;
(5) closed circuit final election, the mine tailing of recleaning is returned primary cleaning (3) to be formed one of closed circuit, the Gold Concentrate under Normal Pressure of the mine tailing of primary cleaning and once purging selection is returned one roughing (1) form closed circuitly two, the Gold Concentrate under Normal Pressure that secondary is scanned is returned once purging selection and is formed closed circuit three.
The closed-circuit method of the described raising refractory gold ore concentrate quality and the rate of recovery, this sodium pyrophosphate and raw ore are preferably 0.115～0.195% by weight percentage.
The sodium pyrophosphate that the present invention adds in identical refractory gold ore raw ore carries out closed circuit flotation contrast test, testing result such as following table with the prodan that adds usually:
Table 1
| Inhibitor kind and consumption (gram/ton) | Product | Productive rate (%) | Gold grade (gram/ton) | The rate of recovery (%) |
| Sodium pyrophosphate 1000～3000 | The Gold Concentrate under Normal Pressure mine tailing | 21.32 78.68 | 32.42 1.06 | 89.27 10.73 |
| Raw ore | 100.00 | 7.75 | 100.00 | |
| Prodan 1000～2000 | The Gold Concentrate under Normal Pressure mine tailing | 23.33 76.67 | 6.58 1.31 | 86.06 13.94 |
| Raw ore | 100.00 | 7.21 | 100.00 |
See by table 1, the Gold Concentrate under Normal Pressure gold grade of the sodium pyrophosphate that the present invention adds reaches 32.42 gram/tons, the rate of recovery reaches 89.27%, be higher than the Gold Concentrate under Normal Pressure gold grade 6.58 gram/tons of common adding prodan, the mineral processing index of the rate of recovery 86.06%, and prodan has certain toxicity, and environment is had pollution.
Claims (2)
1. a closed-circuit method that improves the refractory gold ore concentrate quality and the rate of recovery is to add sodium pyrophosphate respectively in one roughing, primary cleaning operation, specifically may further comprise the steps:
(1) be Na with molecular formula
4P
2O
710H
2The powdery of O or graininess sodium pyrophosphate and raw ore 0.1～0.3% water by weight percentage are dissolved into the sodium pyrophosphate aqueous solution;
(2) one roughing adds raw ore slurry with the sodium pyrophosphate aqueous solution and stirs evenly, and carries out one roughing;
(3) primary cleaning adds the Gold Concentrate under Normal Pressure of one roughing and the Gold Concentrate under Normal Pressure of roughly selecting through one roughing, secondary with the sodium pyrophosphate aqueous solution and stirs evenly, and carries out primary cleaning;
(4) recleaning carries out recleaning with the Gold Concentrate under Normal Pressure of primary cleaning, sub-elects the mine tailing and the final products Gold Concentrate under Normal Pressure of recleaning;
(5) closed circuit final election, the mine tailing of recleaning is returned primary cleaning (3) to be formed one of closed circuit, the Gold Concentrate under Normal Pressure of the mine tailing of primary cleaning and once purging selection is returned one roughing (1) form closed circuitly two, the Gold Concentrate under Normal Pressure that secondary is scanned is returned once purging selection and is formed closed circuit three.
2. the closed-circuit method of the raising refractory gold ore concentrate quality according to claim 1 and the rate of recovery, this sodium pyrophosphate and raw ore are preferably 0.145～0.175% by weight percentage.
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| CN101028612B true CN101028612B (en) | 2011-08-24 |
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| CN103990549A (en) * | 2014-05-30 | 2014-08-20 | 紫金矿业集团股份有限公司 | Beneficiation method for complex multi-metal sulfide electrum comprehensive recovery |
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