CN109731668B - Method for reducing total cyanogen concentration of tailings in gold ore dressing process - Google Patents
Method for reducing total cyanogen concentration of tailings in gold ore dressing process Download PDFInfo
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- CN109731668B CN109731668B CN201910117317.6A CN201910117317A CN109731668B CN 109731668 B CN109731668 B CN 109731668B CN 201910117317 A CN201910117317 A CN 201910117317A CN 109731668 B CN109731668 B CN 109731668B
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Abstract
The invention discloses a method for reducing the total cyanogen concentration of tailings in the beneficiation process of gold ores, which comprises the following steps: grinding raw ore, mixing raw ore particles with water, pulping, grinding ore until the fineness is-0.043 mm and the content is 79%; reselecting to obtain gold concentrate and tailings, mixing the raw ore grinding product obtained in the raw ore grinding step with fluidized water for size mixing, and reselecting the ore pulp by using a reselecting machine to obtain gold concentrate and reselected tailings; leaching the gravity tailings to obtain pregnant solution and leaching residues, leaching the gravity tailings obtained in the previous step for 36 hours by using a low-cyanogen leaching agent, and performing solid-liquid separation to obtain the pregnant solution and the leaching residues. The method can effectively recover the gold in the gold ore and reduce the total cyanogen concentration of the leaching residue to be below the environmental protection standard. The invention uses the low-cyanogen agent DJX for leaching, not only has remarkable leaching effect, but also can further reduce the total cyanogen concentration in the tailings, thereby leading the tailings to meet the requirement of environmental protection and discharge.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a method for reducing the total cyanogen concentration of tailings in a gold ore beneficiation process.
Background
Cyaniding gold leaching is the most widely applied method for treating gold ore in the prior art at present, in order to improve the leaching index of the gold ore in production, metallurgical enterprises generally increase the dosage of leaching agents, so that the total cyanide concentration of tailings is seriously exceeded, but excessive free cyanide radicals in the tailings seriously pollute the surrounding environment and water quality. With the further humanity of the environmental protection concept and the increasing perfection of the national environmental protection policy, the metallurgical enterprises have to consider the environmental protection problem of the tailings in the process of processing the gold ores, namely, a method for reducing the total cyanogen concentration of the tailings is needed to meet the environmental protection requirement. In the prior art, raw ore is directly subjected to cyaniding leaching, the total cyanogen concentration of leaching residues is 80ppm and is far higher than 0.5ppm specified by environmental protection, at present, a large number of researchers are researching to use low-cyanogen reagent to leach gold, the total cyanogen concentration of the leaching residues can be reduced to 5ppm by adopting the low-cyanogen reagent to leach the gold, and the emission standard can not be met, so that the total cyanogen concentration of cyaniding leaching tailings can be reduced to a great extent by using the low-cyanogen reagent to leach the gold, but the national environmental protection requirement is difficult to meet. Based on the above-mentioned defects in the prior art, there is a need to develop a method for reducing the total cyanogen concentration of tailings in the gold ore beneficiation process, so as to reduce the total cyanogen concentration of tailings below the environmental protection standard.
Disclosure of Invention
The invention provides a method for reducing the total cyanogen concentration of tailings in the gold ore beneficiation process, aiming at overcoming the defects in the prior art, and the method can effectively recover gold in the gold ore and reduce the total cyanogen concentration of leaching residues to be below the environmental protection standard.
The invention is realized by the following technical scheme: a method for reducing the total cyanogen concentration of tailings in the gold ore beneficiation process specifically comprises the following steps:
step (1), grinding raw ores: mixing the raw ore particles with water, pulping, and grinding the ore until the fineness is-0.043 mm and the content is 79%;
and (2) reselecting to obtain gold concentrate and tailings: mixing the raw ore grinding product obtained in the step (1) with fluidized water for size mixing, and reselecting the ore pulp by using a reselecting machine to obtain gold concentrate and reselected tailings;
step (3), leaching gravity tailings to obtain pregnant solution and leaching residues: and (3) leaching the gravity tailings obtained in the step (2) for 36 hours by using a low-cyanogen leaching agent, and performing solid-liquid separation to obtain pregnant solution and leaching residues.
The low-cyanogen leaching agent is a composite low-cyanogen leaching agent DJX mainly comprising sodium cyanate, and the composite low-cyanogen leaching agent DJX is a low-cyanogen leaching agent compounded by beta-dicarbonyl compound, sodium cyanate and sodium thiosulfate according to the mass ratio of 2:3: 1.
The reaction conditions of the reselection step in the step (2) are as follows: the feed concentration is 50%, the separation gravity value is 80G and the fluidization water amount is 3L/min.
The reaction conditions of the low cyanogen leaching step in the step (3) are as follows: 40 percent of pulp mass concentration, 5000g/t of CaO dosage and 1200g/t of low-cyanogen leaching agent dosage.
The gravity separator adopts a CVD Nielsen gravity separator.
The invention has the beneficial effects that: the method for reducing the total cyanogen concentration of the tailings in the gold ore beneficiation process can effectively recover gold in the gold ore and reduce the total cyanogen concentration of leaching residues to be below the environmental protection standard. According to the invention, a part of gold is recovered in advance in the gravity separation process, so that the dosage of a medicament required by subsequent leaching is reduced, the production cost can be reduced, and the total cyanogen concentration of tailings subjected to subsequent leaching can be reduced. In addition, the low-cyanogen agent DJX is used for leaching, so that the leaching effect is obvious, and the total cyanogen concentration in the tailings can be further reduced, so that the tailings meet the requirement of environmental protection and discharge.
According to the method, gold embedded in sulfide with fine particles is recovered in advance from raw ore through Nielsen reselection, a part of qualified gold concentrate is obtained at first, and the step can reduce the dosage of the original leaching agent by more than 50%, so that the total cyanogen concentration of subsequent leaching residues is reduced, and the production cost is reduced. The gravity tailings are leached by the low-cyanogen agent DJX, so that the total cyanogen concentration of the leaching residue is further reduced, and finally the total cyanogen concentration of the leaching residue is reduced to 0.3ppm, thereby meeting the requirement of environmental protection and discharge.
The raw ores selected in the examples of the present invention were measured to have main contents as shown in table 1, wherein gold is mainly present in pyrite and pyrrhotite, and secondly present between quartz grains, which is a main element to be recovered.
Table 1: multielement analysis of raw ore (%)
| Composition (I) | Au* | TFe | S | SiO2 | Al2O3 | CaO | MgO |
| Content/% | 2.83 | 7.15 | 1.51 | 56.81 | 12.34 | 5.35 | 4.18 |
Note: units are g/t.
Gold concentrate is obtained by reselection after grinding raw ore, and reselection results are shown in table 2:
table 2: result of raw ore reselection
| Name (R) | Yield/%) | Gold grade/% | Gold recovery% |
| Gold concentrate | 4.56 | 35.44 | 55.85 |
| Tailings | 95.44 | 1.34 | 44.15 |
| Total up to | 100.00 | 2.90 | 100.00 |
The gravity tailings are subjected to the step (3) to obtain gold-containing pregnant solution and tailings, and the specific results are shown in Table 3:
table 3: low-cyanogen leaching result of gravity separation tailings
| Name (R) | Gold grade/(g/t) | Total cyanogen concentration/(ppm) | Leaching rate of gold operation/%) | For raw ore gold recovery/%) |
| Noble liquid | ＼ | ＼ | 91.88 | 40.57 |
| Tailings | 0.13 | 0.3 | 8.12 | 3.58 |
As can be seen from tables 1 to 3, compared with the prior art, the present invention has the following features: 1. the total recovery rate of gold in the reselection-leaching combined process is 96.42 percent; 2. gold of 55.85 percent of the raw ore is recovered in advance by gravity separation, so that the dosage of a leaching agent used in the leaching process is reduced by more than 50 percent, the total cyanogen concentration of subsequent leaching tailings is favorably reduced, and the method is economic and environment-friendly; 3. the low-cyanogen leaching agent DJX is used for leaching gravity tailings, so that the total cyanogen concentration of the leached tailings is further reduced, the total cyanogen concentration of the tailings is finally reduced to 0.3ppm, the standard of underground filling is achieved, and the total cyanogen concentration specified in environmental protection is not more than 0.5 ppm.
Drawings
FIG. 1 is a process flow diagram of the method for reducing the total cyanogen concentration of tailings in the gold ore beneficiation process of the present invention.
FIG. 2 is a flow chart of a reselection process in the method for reducing the total cyanide concentration in the tailings of the invention;
FIG. 3 is a flow chart of the leaching process in the method for reducing the total cyanogen concentration of the tailings of the invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are only some embodiments, not all embodiments, of the present invention.
As shown in fig. 1 to 3, a method for reducing the total cyanogen concentration of tailings in the gold ore beneficiation process specifically comprises the following steps:
step (1), grinding raw ores: mixing the raw ore particles with water, pulping, and grinding the ore until the fineness is-0.043 mm and the content is 79%;
and (2) reselecting to obtain gold concentrate and tailings: mixing the raw ore grinding product obtained in the step (1) with fluidized water, mixing the mixed pulp, and reselecting the pulp by using a CVD Nielson reselecting machine under the reaction conditions of 50% of ore feeding concentration, 80G of separation gravity value and 3L/min of fluidized water amount to obtain gold concentrate and reselected tailings;
step (3), leaching gravity tailings to obtain pregnant solution and leaching residues: and (3) carrying out low-cyanogen leaching on the gravity tailings obtained in the step (2) for 36h by using a low-cyanogen leaching agent under the reaction conditions of 40% of mass concentration of ore pulp, 5000g/t of CaO and 1200g/t of low-cyanogen leaching agent, and carrying out solid-liquid separation to obtain pregnant solution and leaching residue.
The low-cyanogen leaching agent is a composite low-cyanogen leaching agent DJX taking sodium cyanate as a main component, the composite low-cyanogen leaching agent DJX is a low-cyanogen leaching agent compounded by beta-dicarbonyl compound, sodium cyanate and sodium thiosulfate according to the mass ratio of 2:3:1, and the beta-dicarbonyl compound is ethyl acetoacetate, diethyl malonate, dimethyl malonate, acetylacetone or 1, 3-cyclohexanedione and the like.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (4)
1. A method for reducing the total cyanogen concentration of tailings in the gold ore beneficiation process is characterized in that: the method for reducing the total cyanogen concentration of the leaching residue in the gold ore beneficiation process specifically comprises the following steps:
step (1), grinding raw ores:
mixing the raw ore particles with water, pulping, and grinding the ore until the fineness is-0.043 mm and the content is 79%;
and (2) reselecting to obtain gold concentrate and tailings:
mixing the raw ore grinding product obtained in the step (1) with fluidized water for size mixing, and reselecting the ore pulp by using a reselecting machine to obtain gold concentrate and reselected tailings;
step (3), leaching gravity tailings to obtain pregnant solution and leaching residues:
performing low-cyanogen leaching on the gravity tailings obtained in the step (2) for 36 hours by using a low-cyanogen leaching agent, and performing solid-liquid separation to obtain pregnant solution and leaching residues;
the low-cyanogen leaching agent is a composite low-cyanogen leaching agent DJX taking sodium cyanate as a main component; the composite low-cyanogen leaching agent DJX is a low-cyanogen leaching agent compounded by beta-dicarbonyl compound, sodium cyanate and sodium thiosulfate according to the mass ratio of 2:3: 1.
2. The method for reducing the total cyanogen concentration of the tailings in the gold ore dressing process according to claim 1, which is characterized in that: the reaction conditions of the reselection step in the step (2) are as follows: the feed concentration is 50%, the separation gravity value is 80G and the fluidization water amount is 3L/min.
3. The method for reducing the total cyanogen concentration of the tailings in the gold ore dressing process according to claim 1, which is characterized in that: the reaction conditions of the low cyanogen leaching step in the step (3) are as follows: 40 percent of pulp mass concentration, 5000g/t of CaO dosage and 1200g/t of low-cyanogen leaching agent dosage.
4. The method for reducing the total cyanogen concentration of the tailings in the gold ore dressing process according to claim 1, which is characterized in that: the reselection machine adopts a Nelsen reselection machine.
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| CN1187124C (en) * | 2003-03-12 | 2005-02-02 | 福建紫金矿业股份有限公司 | Ore separating method for low-grade oxide gold ore |
| AU2007205792B2 (en) * | 2006-09-28 | 2009-02-26 | Jx Nippon Mining & Metals Corporation | Method for leaching gold |
| CN101898167A (en) * | 2010-07-17 | 2010-12-01 | 孙宝海 | Dressing process of gold ores |
| CN104232922B (en) * | 2014-10-21 | 2016-06-08 | 福建省双旗山矿业有限责任公司 | A kind of Sodium cyanate (NaOCN) gold-leaching technology |
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