CN217431924U - Decyanation system of cyanidation tailing - Google Patents
Decyanation system of cyanidation tailing Download PDFInfo
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- CN217431924U CN217431924U CN202221326611.1U CN202221326611U CN217431924U CN 217431924 U CN217431924 U CN 217431924U CN 202221326611 U CN202221326611 U CN 202221326611U CN 217431924 U CN217431924 U CN 217431924U
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Abstract
The disclosure relates to a decyanation system of cyanide tailings, which comprises a pretreatment reaction unit (7), a first thickener (12) and a flotation unit (8) which are communicated in sequence; the pretreatment reaction unit (7) comprises a cyanided tailing slurry inlet and a pretreated tailing slurry outlet; the first thickener (12) comprises a pretreated tailings slurry inlet and a concentrated tailings slurry outlet; the flotation unit (8) comprises a concentrated tailing slurry inlet, a flotation tailing outlet and a flotation concentrate outlet; a pretreated tailing slurry outlet of the pretreatment reaction unit (7) is communicated with a pretreated tailing slurry inlet of the first thickener (12); the concentrated tailings slurry outlet of the first thickener (12) is in communication with the concentrated tailings slurry inlet of the flotation unit (8). Adopt this disclosed system to contain cyanogen tailings and carry out decyanation and handle, can promote the suitability of reaction and can reduce the operation degree of difficulty, simultaneously, can improve the rate of recovery of gold in the flotation concentrate.
Description
Technical Field
The disclosure relates to the technical field of tailing treatment, in particular to a decyanation system for cyanided tailings.
Background
At present, cyanide slag harmless treatment technologies which can be industrially applied mainly include a chlorine oxidation method, a hydrogen peroxide oxidation method, an ozone oxidation method, an integral method, an ore pulp acidification-oxidation method, a barren liquor purification-squeezing-backwashing method, a squeezing-backwashing-purification method, a three-waste linkage treatment method, a heating and pressurizing hydrolysis method, a biological method, a carbon pulp method, a leaching-emergency treatment method, a natural degradation method, an enhanced natural degradation method and the like.
When the medicament is used, the problems of harsh use conditions, complex treatment facilities, long treatment time, secondary pollution, potential safety hazards, high treatment cost and the like exist.
SUMMERY OF THE UTILITY MODEL
The purpose of the disclosure is to provide a decyanation system for cyanided tailings, and aims to solve the problems of harsh use conditions, complex treatment facilities, long treatment time, secondary pollution, potential safety hazards, high treatment cost and the like in the prior art.
In order to achieve the above object, the present disclosure provides a decyanation system for cyanided tailings, which includes a pretreatment reaction unit, a first thickener and a flotation unit, which are sequentially communicated; the pretreatment reaction unit comprises a cyanided tailing slurry inlet, a first decyanation agent inlet, a second decyanation agent inlet and a pretreated tailing slurry outlet; the first thickener comprises a pretreated tailings slurry inlet and a concentrated tailings slurry outlet; the flotation unit comprises a concentrated tailing slurry inlet, a flotation tailing outlet and a flotation concentrate outlet; a pretreated tailing slurry outlet of the pretreatment reaction unit is communicated with a pretreated tailing slurry inlet of the first thickener; and the concentrated tailing slurry outlet of the first thickener is communicated with the concentrated tailing slurry inlet of the flotation unit.
Optionally, the system further comprises a medicament agitation unit comprising a first medicament agitation tank and a second medicament agitation tank; the first agent stirring tank comprises a first decyanation agent outlet, and the second agent stirring tank comprises a second decyanation agent outlet; and a first decyanation agent inlet of the pretreatment reaction unit is communicated with a first decyanation agent outlet of the first agent stirring tank, and a second decyanation agent inlet of the pretreatment reaction unit is communicated with a second decyanation agent outlet of the second agent stirring tank.
Optionally, the pretreatment reaction unit comprises a first pretreatment reaction tank, a second pretreatment reaction tank and a third pretreatment reaction tank which are sequentially communicated; the first pretreatment reaction tank comprises a first decyanation agent inlet and a second decyanation agent inlet; the first pretreatment reaction tank, the second pretreatment reaction tank and the third pretreatment reaction tank are arranged in series.
Optionally, the flotation unit comprises a rougher flotation device, a cleaner flotation device and a scavenger flotation device; the roughing flotation device comprises a pretreated tailing slurry inlet, a roughing tailing slurry outlet and a roughing foam outlet; the fine flotation device comprises a rough flotation foam inlet and a flotation concentrate outlet; the scavenging flotation device comprises a rougher tailing slurry inlet and a flotation tailing outlet; the inlet of the pretreated tailing slurry of the roughing flotation device is communicated with the outlet of the pretreatment reaction unit; a roughing foam inlet of the fine flotation device is communicated with a roughing foam outlet of the roughing flotation device; and a rougher tailing slurry inlet of the scavenging flotation device is communicated with a rougher tailing slurry outlet of the rougher flotation device.
Optionally, the rougher flotation device comprises 4 flotation machines arranged in series, the cleaner flotation device comprises 3 flotation machines arranged in series, and the scavenger flotation device comprises 9 flotation machines arranged in series.
Optionally, the outlet line of the scavenger flotation device has a first branch and a second branch; the first branch of the scavenging flotation device is used for being communicated with an inlet of the standard tailings pond; and a second branch of the scavenging flotation device is communicated with an inlet of the raw material tailing pond.
Optionally, the system further comprises a pH adjusting tank arranged at the inlet of the pretreatment reaction unit, wherein the pH adjusting tank comprises an acidizing fluid inlet, a size-adjusting cyanide-containing tailing slurry inlet and a cyanide tailing slurry outlet; the acidification liquid inlet of the pH adjusting tank is communicated with the outlet of the acid solution unit; the slurry-mixing cyanide-containing tailing slurry inlet of the pH adjusting tank is communicated with the outlet of the tailing slurry-mixing stirring tank; and a cyanide tailing slurry outlet of the pH adjusting tank is communicated with a cyanide tailing slurry inlet of the pretreatment reaction unit.
Optionally, the first thickener further comprises an overflow conditioning water outlet for communicating with a conditioning water tank.
Optionally, the system further comprises a flotation concentrate processing unit comprising a second thickener and a ceramic filter; and the overflow adjusting water outlet of the second thickener and the filtered water outlet of the ceramic filter are communicated with the inlet of the adjusting water tank.
Optionally, a buffer stirring tank is further arranged between the first thickener and the pretreatment reaction unit.
Through above-mentioned technical scheme, adopt this disclosed system to carry out decyanation to cyanide-containing tailings, can promote the suitability of reaction to need not the aeration of ventilating, reduce the operation degree of difficulty, simultaneously, can improve the rate of recovery of gold in the flotation concentrate.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic diagram of a system for decyanation treatment of cyanided tailings according to the present disclosure.
Description of the reference numerals
1. A raw material tailing pond; 2. a buffer stirring tank; 3. a size mixing and stirring tank; 4. a first agent agitation tank; 5. a second agent agitation tank; 6. a pH stirring tank; 7. a pretreatment reaction unit; 8. a flotation unit; 9. adjusting the water tank; 10. a sulfuric acid head tank; 11. a sulfuric acid storage tank; 12. a first thickener; 13. a second thickener; 14. a sand pump box; 15. a concentrate sand pump box; 16. a ceramic filter; 17. a buffer stirring tank; 21. a first pretreatment reaction tank; 22. a second pretreatment reaction tank; 23. a third pretreatment reaction tank; 24. a roughing flotation device; 25. a fine flotation device; 26. a scavenging flotation device; 27. a flotation machine; 28. a standard tailing pond; 29. and (4) mixing the concentrates.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, the terms "first, second, third" and the like are used for descriptive purposes only and not for indicating or implying relative importance or implicitly indicating the number of technical features indicated, unless stated to the contrary. Thus, a feature defined as "first, second or third" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
The first aspect of the present disclosure provides a decyanation system for cyanidation tailings, which is shown in reference to fig. 1 and comprises a pretreatment reaction unit 7, a first thickener 12 and a flotation unit 8 which are communicated in sequence; the pretreatment reaction unit 7 comprises a cyanided tailing slurry inlet, a first decyanation agent inlet, a second decyanation agent inlet and a pretreated tailing slurry outlet; the first thickener 12 comprises a pretreated tailings slurry inlet and a concentrated tailings slurry outlet; the flotation unit 8 comprises a concentrated tailing slurry inlet, a flotation tailing outlet and a flotation concentrate outlet; the pretreated tailings slurry outlet of the pretreatment reaction unit 7 is communicated with the pretreated tailings slurry inlet of the first thickener 12, so that the pretreated tailings slurry can be concentrated by the first thickener 12; the concentrated tailings slurry outlet of the first thickener 12 is in communication with the concentrated tailings slurry inlet of the flotation unit 8 to enable the concentrated tailings slurry to enter the flotation unit 8 for flotation treatment.
Through the technical scheme, the pre-treatment reaction unit 7 is arranged in the decyanation system provided by the disclosure, so that cyanide tailing slurry from the upstream is mixed with a decyanation agent composition for carrying out a pre-treatment reaction; the decyanation agent used in the method can improve the applicability of the reaction and does not need aeration, so that air blowing or air discharging equipment does not need to be arranged in the pretreatment reaction unit 7, and the operation difficulty is reduced; meanwhile, the pretreatment reaction is carried out in the pretreatment reaction unit 7 disclosed by the invention, the pretreatment reaction effect is better, the cyanide removal rate and the decyanation rate are improved, and the cost can be reduced. The slurry treated by the pretreatment reaction unit 7 is concentrated by the first thickener 12, and after the slurry is adjusted to a proper concentration, the slurry is sent to the flotation unit 8 for flotation treatment, so that flotation concentrate and flotation tailings can be separated, and are treated by different methods respectively, and the recovery rate of gold in the flotation concentrate can be improved.
In a specific embodiment of the present disclosure, as shown in fig. 1, the system further comprises a medicament agitation unit comprising a first medicament agitation tank 4 and a second medicament agitation tank 5; the first agent stirring tank 4 comprises a first decyanation agent outlet, and the second agent stirring tank 5 comprises a second decyanation agent outlet; the first decyanation agent inlet of the pretreatment reaction unit 7 is communicated with the first decyanation agent outlet of the first agent stirring tank 4, and the second decyanation agent inlet of the pretreatment reaction unit 7 is communicated with the second decyanation agent outlet of the second agent stirring tank 5, so that the first decyanation agent composition configured in the first agent stirring tank 4 and the second decyanation agent composition configured in the second agent stirring tank 5 can enter the pretreatment reaction unit 7 to be mixed with cyanide tailing slurry for decyanation reaction.
It should be noted that the pretreatment reaction unit 7 of the present disclosure includes a first pretreatment reactor and at least one second pretreatment reactor, wherein the first pretreatment reactor and the at least one second pretreatment reactor are arranged in series, and a plurality of second pretreatment reactors may be arranged in series or in parallel. In one embodiment of the present disclosure, the pretreatment reaction unit 7 includes a first pretreatment reaction tank 21, a second pretreatment reaction tank 22, and a third pretreatment reaction tank 23; the first pretreatment reaction tank 21 comprises the cyanided tailing slurry inlet, the first decyanation agent inlet, the second decyanation agent inlet and a first pretreatment slurry outlet; the second pretreatment reactor tank 22 comprises a first pretreatment slurry inlet and a second pretreatment slurry outlet; the third pretreatment reaction tank 23 comprises a second pretreatment slurry inlet and a pretreatment tailings slurry outlet; the first pretreatment slurry inlet of the second pretreatment reaction tank 22 is communicated with the first pretreatment slurry outlet of the first pretreatment reaction tank 21, so that the first pretreatment slurry can enter the second pretreatment reaction tank 22 to continue to perform pretreatment reaction; the second pretreatment slurry outlet of the second pretreatment reaction tank 22 is communicated with the second pretreatment slurry inlet of the second pretreatment reaction tank 22 of the third pretreatment reaction tank 23, so that the second pretreatment slurry inlet can enter the third pretreatment reaction tank 23 to continue the pretreatment reaction; the outlet of the third pretreatment reaction tank 23 for the pretreated tailing slurry is communicated with the inlet of the first thickener 12 for the pretreated tailing slurry, so that the pretreated tailing slurry obtained by the pretreatment reaction unit 7 can be concentrated by the first thickener 12.
In one embodiment, as shown in fig. 1, the first pretreatment reactor 21, the second pretreatment reactor 22, and the third pretreatment reactor 23 are disposed in series with each other.
In one embodiment, a first monitoring device is disposed in the third pretreatment reaction tank 23 for monitoring whether the pretreated tailings slurry therein meets a first threshold, wherein the first threshold includes that the weight percentage concentration of cyanide tailings in the pretreated tailings slurry is 25-35 wt%, and CN is CN - The content of (b) is 0.02-0.5 mg/L. When the pretreatment tail in the third pretreatment reaction tank 23When the mineral slurry meets the first threshold value, the pretreated tailings slurry enters a first thickener 12 for concentration treatment.
In one embodiment, as shown in fig. 1, the flotation unit 8 comprises a rougher flotation device 24, a cleaner flotation device 25 and a scavenger flotation device 26; the rougher flotation device 24 comprises a pretreated tailings slurry inlet, a rougher tailings slurry outlet and a rougher froth outlet, the cleaner flotation device 25 comprises a rougher froth inlet and a flotation concentrate outlet, and the scavenger flotation device 26 comprises a rougher tailings slurry inlet and a flotation tailings outlet; the inlet of the pretreated tailing slurry of the roughing flotation device 24 is communicated with the outlet of the pretreatment reaction unit 7; the roughing froth inlet of the concentration flotation device 25 is communicated with the roughing froth outlet of the roughing flotation device 24 so that the roughing froth can enter the concentration flotation device 25 for concentration flotation treatment; the rougher tailings slurry inlet of the scavenger flotation unit 26 is in communication with the rougher tailings slurry outlet of the rougher flotation unit 24 so that the rougher tailings slurry can enter the scavenger flotation unit 26 for scavenger treatment.
It is noted that, as shown in fig. 1, the rougher flotation device 24, the cleaner flotation device 25 and the scavenger flotation device 26 used in the present disclosure are each composed of a different number of flotation machines 27, the rougher flotation device 24 includes 4 flotation machines 27 arranged in series, the cleaner flotation device 25 includes 3 flotation machines 27 arranged in series, and the scavenger flotation device 26 includes 9 flotation machines 27 arranged in series. In addition, a circulating material flow pipeline is arranged between two adjacent flotation machines 27, namely, the material flow passing through the upstream flotation machine 27 is divided into two parts, one part enters the next stage flotation machine 27 for further flotation, and the other part of the material flow returns to the inlet of the upstream flotation machine 27 through the circulating material flow pipeline. Through the arrangement mode and the flotation method, the flotation concentrate and the flotation tailings can be separated more fully, the yield of the flotation concentrate can be further increased, and the gold grade of the flotation concentrate and the gold recovery rate can be increased.
In a further embodiment, one or more compartments are provided at suitable locations in the flotation unit 8 for controlling the level and flow rate of the flotation machine 27; for example, one or more compartments are provided in the scavenger flotation device 26 and the concentrator flotation device 25.
In one embodiment, the outlet line of the scavenger flotation device 26 has a first leg and a second leg; an outlet pipeline of the scavenging flotation device 26 is used for communicating with an inlet of the standard tailing pond 28, so that the qualified flotation tailings can enter the standard tailing pond 28 for subsequent treatment; the outlet pipeline of the scavenging flotation device 26 is used for communicating with the inlet of the raw material tailing pond 1, so that the unqualified flotation tailings can be returned to the raw material tailing pond 1 for continuous decyanation treatment.
In this embodiment, an online monitoring device is arranged in the outlet pipeline of the scavenger flotation device 26 for monitoring whether the flotation tailings meet the discharge standard, wherein the discharge standard comprises the content of toxic substances, general solid wastes and biological toxic substances, and the specific standard is shown in table 1; when the flotation tailings meet the discharge criteria, the outlet line of the scavenger flotation device 26 is in communication with a first branch line; when the flotation tailings do not meet the discharge standard, the outlet line of the scavenger flotation device 26 communicates with the second branch.
In one embodiment, as shown in fig. 1, the system further comprises a pH adjusting tank 6 disposed at the inlet of the pretreatment reaction unit 7, wherein the pH adjusting tank 6 comprises an acidizing fluid inlet, a size-adjusted cyanide-containing tailing slurry inlet and a cyanide tailing slurry outlet; an acidizing fluid inlet of the pH adjusting tank 6 is communicated with an outlet of the acid solution unit, a pulp-mixing cyanide-containing tailing slurry inlet of the pH adjusting tank 6 is communicated with an outlet of the pulp-mixing stirring tank 3 of the pulp-mixing unit, so that the cyanide tailing slurry in the pH adjusting tank 6 is mixed and stirred with the acid solution in the acid solution unit, and the pH value of the mixture is adjusted to 6-8; and the cyanide tailing slurry outlet of the pH adjusting groove 6 is communicated with the cyanide tailing slurry inlet of the pretreatment reaction unit 7, so that the cyanide tailing slurry can enter the pretreatment reaction unit 7. Wherein, the acid solution unit includes sulphuric acid storage tank 11 and sets up in sulphuric acid head tank 10 of sulphuric acid storage tank 11 low reaches, and the stirring unit of sizing mixing includes buffering stirred tank 2 and the stirring tank 3 of sizing mixing.
In the embodiment, the cyanogen-containing tailings in the raw material tailing pond 1 are hydraulically recovered and then sent into the buffering stirring tank 2 of the slurry mixing and stirring unit for stirring, the slurry is sent into the slurry mixing and stirring tank 3 for mixing and stirring, and the obtained cyanogen-containing tailing slurry is sent into the pH adjusting tank 6 to be contacted with the acid solution from the acid solution unit for acidification treatment, so that the cyanided tailing slurry is obtained. Through the treatment mode, cyanide ions can be complexed with substances in the decyanation agent composition under a more proper pH value, so that the reaction effect of the pretreatment reaction can be further enhanced, and the removal rate of cyanogen is further increased.
In one embodiment, the system further comprises a flotation concentrate processing unit comprising a second thickener 13 and a ceramic filter 16. In this embodiment, the flotation concentrate is first fed into the second thickener 13 for concentration and then filtered by the ceramic filter 16, and the obtained filter residue is the bulk concentrate 29.
In a preferred embodiment, as shown in fig. 1, the first thickener 12 and the second thickener 13 each have an overflow regulated water outlet, and the overflow regulated water outlet of the first thickener 12, the overflow regulated water outlet of the second thickener 13, and the filtered water outlet of the ceramic filter 16 are adapted to communicate with an inlet of the regulated water tank 9 so that the regulated water can be returned to the regulated water tank 9 for recycling. The regulation water entry of mixing the thick liquid stirred tank 3, first medicament stirred tank 4 and second medicament stirred tank 5 all communicates with the export of regulation pond 9 to make the regulation water in the regulation pond 9 can provide the regulation water for mixing the thick liquid stirred tank 3, first medicament stirred tank 4 and second medicament stirred tank 5.
It should be noted that slurry among the tanks of the system can be driven to flow in the pipeline by a height difference or a power pump, so as to realize the transfer of the slurry among the various parts of the pretreatment reaction unit 7, for example, in a specific embodiment of the present disclosure, the first pretreatment reaction tank 21, the second pretreatment reaction tank 22 and the third pretreatment reaction tank 23 in the pretreatment reaction unit 7 complete the transfer of the slurry by a height difference, specifically, the first pretreatment reaction tank 21 is 0.3 to 0.5m higher than the second pretreatment reaction tank 22, and the second pretreatment reaction tank 22 is 0.3 to 0.5m higher than the third pretreatment reaction tank 23. In another embodiment of the present disclosure, the slurry in the buffer stirring tank 2 and the slurry mixing stirring tank 3 is driven to flow in the pipeline by a power pump.
In one embodiment, a buffer stirring tank 17 is further arranged between the first thickener 12 and the pretreatment reaction unit 7.
In order to stabilize the operation of the system, a sand pump tank 14 and a concentrate pump tank 15 are also provided at appropriate positions of the system, as shown in fig. 1.
In one embodiment, as shown in fig. 1, the method for decyanation treatment of cyanided tailings comprises:
the method comprises the steps of conveying cyanide-containing tailings in a raw material tailing pond 1 into a buffering stirring tank 2 through hydraulic recovery, conveying obtained slurry into a size mixing stirring tank 3 to be mixed with adjusting water from an adjusting water pond 9 for size mixing and stirring, conveying the size-mixed cyanide-containing tailing slurry into a pH stirring tank 6 to be contacted with concentrated sulfuric acid from a sulfuric acid head tank 10 and a sulfuric acid storage tank 11 for acidification treatment until the pH value in the pH stirring tank 6 is 6-8, and obtaining the cyanide tailing slurry.
FeSO (ferric oxide) is added 4 ·7H 2 O、CuSO 4 ·5H 2 Mixing O and cobalt chloride in a first agent stirring tank 4 with regulating water from a regulating water tank 9, stirring to obtain a first decyanation agent composition, mixing polymeric ferric sulfate, polymeric aluminum chloride and polyacrylamide in a second agent stirring tank 5 with the regulating water from the regulating water tank 9, stirring to obtain a second decyanation agent composition, and enabling cyanide tailing slurry to flow into a pretreatment reaction unit 7 for pretreatment reaction, wherein FeSO is used for the pretreatment reaction based on the total weight of the first decyanation agent composition 4 ·7H 2 The content of O is 10 to 25 wt%, preferably 10 to 20 wt%; CuSO 4 ·5H 2 The content of O is 6 to 15 wt%, preferably 6 to 10 wt%; the content of cobalt chloride is 6-15 wt%, preferably 6-10 wt%; based on the total weight of the second decyanation agent component, the content of the polymeric ferric sulfate is 25-45 wt%, and preferably 20-40 wt%; the content of the polyaluminium chloride is 6-25 weight portionsAn amount%, preferably 6 to 20 wt%; the content of the polyacrylamide is 6 to 15 wt%, preferably 6 to 10 wt%. The method specifically comprises the following steps: feeding the cyanide tailing slurry into a first pretreatment reaction tank 21 to be mixed with a first decyanation agent composition and a second decyanation agent composition for pretreatment reaction to obtain first pretreatment tailing slurry; feeding the first pre-decyanation tailing slurry into a second pre-treatment reaction tank 22 for a second pre-treatment reaction to obtain a second pre-treatment tailing slurry; and (3) feeding the second pretreated tailing slurry into a third pretreatment reaction tank 23 for carrying out third pretreatment reaction to obtain pretreated tailing slurry, wherein the conditions of the pretreatment reaction comprise: the dosage of the decyanation agent composition is 1-3 g relative to 1mg of cyanide in the cyanided tailing slurry, and the weight ratio of the first decyanation agent composition to the second decyanation agent composition in the decyanation agent composition is 1: (1-5), preferably 1: (2-4), the reaction temperature is 20-30 ℃, and the stirring linear speed is 1-3 m/s.
And (3) sending the obtained pretreated tailing slurry into a buffering stirring tank 17, pumping into a first thickener 12, and automatically flowing overflowing regulating water into a regulating water tank 9. Adjusting the ore pulp concentration of the pretreated tailing slurry to 25-35 wt%, and sending the ore pulp concentration to a roughing flotation device 24 in a flotation unit 8 for roughing flotation; obtaining rougher tailing slurry and rougher foam, and sending the rougher foam into a cleaner flotation device 25 for cleaner flotation treatment to obtain flotation concentrate; the rougher tailings slurry is sent to a scavenger flotation device 26 for scavenger flotation to obtain flotation tailings.
Monitoring parameter standards of the flotation tailings on line, and sending the flotation tailings to a standard tailings pond 28 when the flotation tailings meet the standards; and when the flotation tailings do not meet the standard, returning the flotation tailings to the raw material tailing pond 1 for secondary decyanation treatment.
TABLE 1 flotation tailings standards
The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby. The criteria for the cyanided tailings slurry used in the following examples and comparative examples are shown in table 2.
TABLE 2 properties of cyanided tailings slurries in examples and comparative examples
Example 1
The cyanogen-containing tailings in the raw material tailing pond 1 are fed into a buffering stirring tank 2 through hydraulic recovery, the obtained slurry is fed into a size mixing stirring tank 3 to be mixed with regulating water from a regulating water pond 9 for size mixing and stirring, and the size mixed cyanogen-containing tailing slurry is mixed at the speed of 6.3m 3 And delivering the flow rate of the concentrated sulfuric acid to the pH value adjusting tank 6 to be in contact with the concentrated sulfuric acid from the sulfuric acid head tank 10 and the sulfuric acid storage tank 11 for acidification treatment, wherein the flow rate of the concentrated sulfuric acid is 3.4L/h until the pH value in the pH value adjusting tank 6 is 7.5, and obtaining the cyanide tailing slurry, wherein the weight percentage concentration of the cyanide tailings in the cyanide tailing slurry is 30 wt%.
FeSO (ferric oxide) is prepared 4 ·7H 2 O、CuSO 4 ·5H 2 Mixing O and cobalt chloride with the adjusting water from the adjusting water pool 9 in a first agent stirring tank 4, stirring to obtain a first decyanation agent composition, mixing polymeric ferric sulfate, polymeric aluminum chloride and polyacrylamide with the adjusting water from the adjusting water pool 9 in a second agent stirring tank 5, stirring to obtain a second decyanation agent composition, and allowing cyanide tailing slurry (6.3 m) 3 H) carrying out pretreatment reaction in the self-flowing pretreatment reaction unit 7, and specifically comprising the following steps: feeding the cyanide tailing slurry into a first pretreatment reaction tank 21 to be mixed with a first decyanation agent composition (0.5g/L) and a second decyanation agent composition (0.6g/L) for pretreatment reaction to obtain first pretreatment tailing slurry; the first pre-decyanation tailing slurry is sent into a second pre-treatment reaction tank 22 for second pre-treatment reaction to obtainTo a second pre-treated tailings slurry; and (3) feeding the second pretreated tailing slurry into a third pretreatment reaction tank 23 for carrying out third pretreatment reaction to obtain pretreated tailing slurry, wherein the conditions of the pretreatment reaction comprise: the ratio of the cyanide concentration in the cyanide tailing slurry to the concentration of the decyanation agent composition is 1: 110, the reaction temperature is 20 ℃, the reaction time is 1h, and the stirring linear velocity is 1.57 m/s; the parameter criteria for pre-treatment of the tailings slurry are shown in table 3.
The pretreated tailing slurry is sent to a buffer stirring tank 17 and then pumped into a first thickener 12, and the overflowing regulating water automatically flows into a regulating water tank 9. Adjusting the pulp concentration of the pretreated tailing slurry to 30 wt%, and sending the pulp to a roughing flotation device 24 in a flotation unit 8 for roughing flotation; obtaining rougher tailing slurry and rougher foam, and sending the rougher foam into a cleaner flotation device 25 for cleaner flotation treatment to obtain flotation concentrate; feeding the rougher tailing slurry into a scavenging flotation device 26 for scavenging flotation treatment to obtain flotation tailings; wherein the concentration flotation device 25 consists of 4 flotation machines 27, the concentration flotation device 25 consists of 3 flotation machines 27 and the scavenging flotation device 26 consists of 9 flotation machines 27.
Monitoring parameter standards of the flotation tailings on line, and sending the flotation tailings to a standard tailings pond when the flotation tailings meet a second threshold value; and when the flotation tailings do not meet the second threshold value, returning the flotation tailings to the No. 2 tailing pond for secondary treatment. The reaction time of the pretreatment reaction of the secondary treatment is 1.5h longer than that of the pretreatment reaction, and the tailing slurry is discharged into a tailing pond reaching the standard after reaching the standard. The second threshold is shown in table 1 and the criteria for flotation concentrate are shown in table 4.
Comparative example 1
The apparatus is the same as in example 1 except that the pretreatment reaction unit 7 is not provided.
TABLE 3 parameter criteria for pretreating tailings slurries
Table 4 standard of flotation concentrate in test example
Wherein, the gold grade and the silver grade are obtained by the analysis of a PerkinElmer AAnalyst400 atomic absorption spectrometer, and the calculation method of the yield and the recovery rate of the flotation concentrate in the table 4 is as follows:
from tables 3 and 4, as can be seen from the comparison of the data in example 1 and comparative example 1, the decyanation treatment of the cyanide-containing tailings by using the system of the present disclosure can increase the cyanide removal rate and the decyanation rate and reduce the cost, and at the same time, can increase the recovery rate of gold in the flotation concentrate.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. The decyanation system for cyanide tailings is characterized by comprising a pretreatment reaction unit (7), a first thickener (12) and a flotation unit (8) which are sequentially communicated;
the pretreatment reaction unit (7) comprises a cyanided tailing slurry inlet, a first decyanation agent inlet, a second decyanation agent inlet and a pretreated tailing slurry outlet;
the first thickener (12) comprises a pre-treated tailings slurry inlet and a concentrated tailings slurry outlet;
the flotation unit (8) comprises a concentrated tailing slurry inlet, a flotation tailing outlet and a flotation concentrate outlet;
the pretreated tailing slurry outlet of the pretreatment reaction unit (7) is communicated with the pretreated tailing slurry inlet of the first thickener (12); the concentrated tailings slurry outlet of the first thickener (12) is in communication with the concentrated tailings slurry inlet of the flotation unit (8).
2. A decyanation system for cyanide tailings as claimed in claim 1, characterized in that the system further comprises a reagent agitation unit, said reagent agitation unit comprises a first reagent agitation tank (4) and a second reagent agitation tank (5);
the first agent stirring tank (4) comprises a first decyanation agent outlet, and the second agent stirring tank (5) comprises a second decyanation agent outlet;
a first decyanation agent inlet of the pretreatment reaction unit (7) is communicated with a first decyanation agent outlet of the first agent stirring tank (4), and a second decyanation agent inlet of the pretreatment reaction unit (7) is communicated with a second decyanation agent outlet of the second agent stirring tank (5).
3. A decyanation system of cyanide tailings according to claim 2, wherein the pretreatment reaction unit (7) comprises a first pretreatment reaction tank (21), a second pretreatment reaction tank (22) and a third pretreatment reaction tank (23) which are sequentially communicated; the first pretreatment reaction tank (21) comprises the first decyanation agent inlet and the second decyanation agent inlet;
the first pretreatment reaction tank (21), the second pretreatment reaction tank (22) and the third pretreatment reaction tank (23) are arranged in series.
4. A decyanation system of cyanide tailings according to claim 1, characterized in that the flotation unit (8) comprises a rougher flotation device (24), a cleaner flotation device (25) and a scavenger flotation device (26);
the rougher flotation device (24) comprises a pretreated tailings slurry inlet, a rougher tailings slurry outlet and a rougher froth outlet;
the concentration flotation device (25) comprises a roughing froth inlet and a flotation concentrate outlet;
the scavenger flotation unit (26) comprises a rougher tailings slurry inlet and a flotation tailings outlet;
the inlet of the pretreated tailing slurry of the roughing flotation device (24) is communicated with the outlet of the pretreatment reaction unit (7); the roughing foam inlet of the fine flotation device (25) is communicated with the roughing foam outlet of the roughing flotation device (24); the rougher tailings slurry inlet of the scavenger flotation unit (26) is in communication with the rougher tailings slurry outlet of the rougher flotation unit (24).
5. A decyanation system of cyanide tailings according to claim 4, characterized in that the rougher flotation unit (24) comprises 4 flotation machines (27) arranged in series, the cleaner flotation unit (25) comprises 3 flotation machines (27) arranged in series, and the scavenger flotation unit (26) comprises 9 flotation machines (27) arranged in series.
6. A decyanation system of cyanide tailings according to claim 4, characterized in that the outlet line of the scavenger flotation unit (26) has a first branch and a second branch;
the first branch of the scavenging flotation device (26) is used for being communicated with an inlet of a standard tailings pond (28); and a second branch of the scavenging flotation device (26) is communicated with an inlet of the raw material tailing pond (1).
7. A decyanation system of cyanide tailings according to claim 1, further comprising a pH adjusting tank (6) disposed at the inlet of the pretreatment reaction unit (7), wherein the pH adjusting tank (6) comprises an acidizing fluid inlet, a size-adjusted cyanide tailings slurry inlet and a cyanide tailings slurry outlet;
an acidizing fluid inlet of the pH adjusting tank (6) is communicated with an outlet of the acid solution unit, and a pulp-mixing cyanide-containing tailing slurry inlet of the pH adjusting tank (6) is communicated with an outlet of a pulp-mixing stirring tank (3) of the pulp-mixing stirring unit; and a cyanide tailing slurry outlet of the pH adjusting tank (6) is communicated with a cyanide tailing slurry inlet of the pretreatment reaction unit (7).
8. A decyanation system of cyanide tailings according to claim 1, wherein the first thickener (12) further comprises an overflow conditioned water outlet for communicating with a conditioned water pond (9).
9. A decyanation system of cyanide tailings according to claim 8, characterized in that the system further comprises a flotation concentrate treatment unit comprising a second thickener (13) and a ceramic filter (16);
the overflow adjusting water outlet of the second thickener (13) and the filtered water outlet of the ceramic filter (16) are communicated with the inlet of the adjusting water tank (9).
10. A decyanation system of cyanide tailings according to claim 1, characterized in that a buffer agitation tank (17) is also arranged between the first thickener (12) and the pretreatment reaction unit (7).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115647004A (en) * | 2022-11-04 | 2023-01-31 | 中国科学院过程工程研究所 | Harmless treatment method for cyanide tailings |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115647004A (en) * | 2022-11-04 | 2023-01-31 | 中国科学院过程工程研究所 | Harmless treatment method for cyanide tailings |
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