CN111348770A - Innocent treatment process for cyanidation tailing pulp - Google Patents
Innocent treatment process for cyanidation tailing pulp Download PDFInfo
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- CN111348770A CN111348770A CN201811568486.3A CN201811568486A CN111348770A CN 111348770 A CN111348770 A CN 111348770A CN 201811568486 A CN201811568486 A CN 201811568486A CN 111348770 A CN111348770 A CN 111348770A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/583—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing fluoride or fluorine compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Abstract
The invention discloses a cyanide tailing pulp innocent treatment process, which is a cyanide tailing pulp elution treatment process comprising the steps of ' three-blowing two-washing one-purifying ', filter pressing, blowing-off, clear water washing, blowing-off, environment-friendly treatment water circulation washing and blowing-off ', wherein according to the characteristics that the cyanide tailing pulp of a gold mine contains pollutants such as cyanide and valuable metal elements such as gold and silver, filtrate and new water washing liquid blown off twice at first are returned to a mineral separation production flow, the water balance of the cyanide mineral separation process production is ensured, the valuable metals such as gold and silver which are omitted in tailings are recovered, and the consumption of medicaments such as sodium cyanide and calcium oxide is reduced; then circularly washing with environment-friendly treatment water, circularly eluting and utilizing secondary washing water after purifying treatment, reducing the using amount of the washing water, adsorbing and recovering valuable metals such as gold, silver and the like in the washing water by using activated carbon, and improving the elution effect; meanwhile, the water balance for the environmental protection treatment water circulation washing is realized; the zero discharge of liquid in the mineral separation production is ensured, and the filter pressing residue is eluted to the requirement of environmental protection standard; thereby the whole process has the effect of 'one stone with multiple birds' and has wide application prospect.
Description
Technical Field
The invention relates to a pollutant treatment method in the field of environmental protection, in particular to a gold mine cyanidation tailing slurry treatment method.
Background
At present, most gold production enterprises in China still use a cyanidation gold extraction process, a large amount of cyanide-containing tailings are accumulated while gold is produced, and the problem of solid waste accompanying the cyanidation gold extraction process is increasingly revealed along with the development of the cyanidation gold extraction process technology, particularly, the cyanide-containing tailings are released in the national hazardous waste list (2016 edition) in 2016 (6 months), and cyanide tailings generated in the gold beneficiation process by cyanide are determined as hazardous waste. The environmental protection department of 3 months in 2018 releases and implements the technical specification of gold industry cyanogen slag pollution control (HJ 943-2018), and provides new standard requirements for cyaniding tailings disposal of cyanidation process enterprises. At present, gold mine enterprises in China generally adopt measures for directly carrying out cyanogen reduction treatment on cyanide-containing tailing slurry, the treatment method mostly adopts the traditional cyanogen breaking treatment processes such as an alkali-chlorine method, a causal method, a hydrogen peroxide method and the like, the recovery of cyanides and valuable metal elements in wastewater is not realized, the treatment efficiency is low, the treatment cost is high, and certain treatment burden is caused to the enterprises. The solid-liquid separation and washing process for the cyanidation tailing slurry can enable tailing slag to meet the new standard required by technical specifications, can recover cyanide and valuable metal elements in the tailing slurry, and gradually becomes a preferred process for treating the tailing slurry by cyanidation process enterprises.
Disclosure of Invention
The invention aims to provide an elution treatment process with good treatment effect, high treatment efficiency and stable operation, namely a 'three-blowing two-washing one-purification' elution treatment process, namely a 'filter pressing-blowing-removing-clear water washing-blowing-removing-environment-friendly treatment water circulation washing-blowing-removing' treatment process from the problems existing in the cyanidation tailing slurry solid-liquid separation washing process, wherein the process firstly adopts new water to wash filter pressing residues, washing water returns to the mineral separation production flow, gold and silver in the cyanidation tailing slurry are recovered by means of cyanide leaching, washing liquid recovery, active carbon adsorption and the like, and simultaneously, the water balance of the production flow of the cyanidation mineral separation process is realized; the filter pressing residues are washed by using the environment-friendly treatment water, so that the water balance for circulating washing of the environment-friendly treatment water is realized; the water balance for the ore dressing production of the cyanidation process and the water balance for the circulating washing of the environment-friendly treatment water are achieved, and the two water balance systems are independent and do not interfere with each other; not only ensures that the environmental protection medicament does not have any influence on the front-stage cyaniding beneficiation process, but also ensures the zero discharge of liquid in beneficiation production, and elutes filter-pressing residue to the requirement of environmental protection standard.
The specific process steps are as follows:
(1) and (3) pumping the cyanide tailing slurry from the corner feeding pump into a filter press with washing and blow-off functions for filter pressing, returning the generated filtrate to the cyanide beneficiation production flow, and leaving the filter pressing residue in the filter press for the next operation.
(2) And (3) carrying out forward primary stripping on the filter pressing residues by utilizing an air blower, returning the generated primary stripping liquid to the cyaniding beneficiation production flow, and keeping the filter pressing residues in the filter pressing machine for the next operation.
(3) And (3) washing the filter-pressing residue once in a forward direction by using clear water, returning a washing liquid to a cyaniding mineral separation production flow, and keeping the filter-pressing residue in a filter press for the next operation.
(4) And (3) performing positive secondary stripping on the filter pressing residues by using an air blower, returning the generated secondary stripping liquid to the cyaniding beneficiation production flow, and keeping the filter pressing residues in the filter pressing machine for the next operation.
(5) And (3) performing positive secondary washing on the filter-pressing residues by utilizing the environment-friendly treatment water, returning the generated secondary washing liquid to the environment-friendly treatment system, and remaining the filter-pressing residues in the filter press for the next operation.
(6) And (3) blowing off the filter pressing residues three times in the forward direction by using an air blower, returning the generated three-time blowing-off liquid to the environment-friendly treatment system, and transferring and piling the filter pressing residues in a tailing pond when the filter pressing residues meet the requirement of the environment-friendly standard.
(7) The water in the environment-friendly treatment system is purified by adopting a high-efficiency cyanogen breaking medicament CGHB01, then is adsorbed by adopting activated carbon, valuable metals such as Au, Ag and the like in the water in the environment-friendly treatment system are recovered, and the treated water is used for carrying out positive secondary washing on filter-pressing residues.
In the step (1), the feeding pressure of the cyanidation tailing slurry is 0.4-0.8 Mpa, the feeding mode is that the material is fed from the corner of one side of the filter press in the positive direction, and the feeding time is 10-80 min.
In the step (2), the primary stripping pressure is 0.6-1.0 Mpa, and the stripping time is 5-20 min.
In the step (3), the primary washing pressure is 0.5-1.2 Mpa, and the washing time is 5-30 min. And (4) subtracting the water content of the ore from the water content of the dry slag per unit after operation to ensure the water balance of the cyaniding beneficiation flow, namely that the water of the front cyaniding beneficiation flow does not rise.
In the step (4), the secondary stripping pressure is 0.6-1.0 Mpa, and the stripping time is 3-15 min.
In the step (5), the secondary washing pressure is 0.5-1.2 Mpa, the secondary washing water amount is 1-5 times of the weight of the filter-pressing residue, and the washing time is 5-60 min.
In the step (6), the tertiary stripping pressure is 0.6-1.0 Mpa, the stripping time is 3-15 min, and the tertiary stripping pressure and the stripping time are the same as the secondary stripping parameters in the step (4), so that the water balance of the environment-friendly treatment system is ensured; the environment-friendly treatment system consists of a stirring reactor and a settling tank.
In the step (7), the high-efficiency cyanogen-breaking medicament CGHB01 is formed by adding persulfate and an activator in a certain formula on the basis of an indigenous medicament and a cyanogen-precipitating medicament, the addition amount of the medicament is determined according to the form and the content of cyanide in secondary washing liquid and is 2-5 times of the total cyanide mass, the treatment time is 30-120 min, and the adsorption treatment time of activated carbon is 30-180 min. And adsorbing and recovering the valuable metals such as Au, Ag and the like in the water in the environment-friendly treatment system.
The invention has the beneficial effects that:
according to the characteristic that the gold mine cyanidation tailing pulp contains not only pollutants such as cyanide but also valuable metal elements such as gold and silver, firstly, filtrate and new water washing liquid blown off twice before are returned to the mineral separation production flow, the water balance of the mineral separation production of the cyanidation process is ensured, the valuable metals such as gold and silver omitted in the tailings are recovered, the consumption of medicaments such as sodium cyanide and calcium oxide is reduced, then the secondary washing water is circularly washed by environment-friendly treatment water, the secondary washing water is circularly eluted and utilized after being purified, the consumption of the washing water is reduced, the valuable metals such as gold and silver in the washing water are recovered, and the elution effect is improved; the water balance for the environment-friendly treatment water circulation washing is realized; the water balance for the ore dressing production of the cyanidation process and the water balance for the circulating washing of the environment-friendly treatment water are achieved, and the two water balance systems are independent and do not interfere with each other; the method not only ensures that the environmental protection medicament does not have any influence on the front-stage cyaniding beneficiation process, but also ensures zero discharge of liquid in beneficiation production, and the filter-pressing residue is eluted to the environmental protection standard requirement, so that the whole process has the effect of 'one stone with multiple birds'.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic diagram showing the results of the secondary washing treatment with clean water and treated water in the filter press 1 according to the embodiment of the present application;
figure 2 shows a schematic representation of the results of a normal production run of the filter presses 2, 3, 4 provided in the examples of the present application.
Detailed Description
The invention specifically comprises the following steps:
(1) and (3) pumping the cyanide tailing slurry from the corner feeding pump into a filter press with washing and blow-off functions for filter pressing, returning the generated filtrate to the cyanide beneficiation production flow, and leaving the filter pressing residue in the filter press for the next operation.
(2) And (3) carrying out forward primary stripping on the filter pressing residues by utilizing an air blower, returning the generated primary stripping liquid to the cyaniding beneficiation production flow, and keeping the filter pressing residues in the filter pressing machine for the next operation.
(3) And (3) washing the filter-pressing residue once in a forward direction by using clear water, returning a washing liquid to a cyaniding mineral separation production flow, and keeping the filter-pressing residue in a filter press for the next operation.
(4) And (3) performing positive secondary stripping on the filter pressing residues by using an air blower, returning the generated secondary stripping liquid to the cyaniding beneficiation production flow, and keeping the filter pressing residues in the filter pressing machine for the next operation.
(5) And (3) performing positive secondary washing on the filter-pressing residues by utilizing the environment-friendly treatment water, returning the generated secondary washing liquid to the environment-friendly treatment system, and remaining the filter-pressing residues in the filter press for the next operation.
(6) And (3) blowing off the filter pressing residues three times in the forward direction by using an air blower, returning the generated three-time blowing-off liquid to the environment-friendly treatment system, and transferring and piling the filter pressing residues in a tailing pond when the filter pressing residues meet the requirement of the environment-friendly standard.
(7) The water in the environment-friendly treatment system is purified by adopting a high-efficiency cyanogen breaking medicament CGHB01, then is adsorbed by adopting activated carbon, valuable metals such as Au, Ag and the like in the water in the environment-friendly treatment system are recovered, and the treated water is used for carrying out positive secondary washing on filter-pressing residues.
In the step (1), the feeding pressure of the cyanidation tailing slurry is 0.4-0.8 Mpa, the feeding mode is that the material is fed from the corner of one side of the filter press in the positive direction, and the feeding time is 10-80 min.
In the step (2), the primary stripping pressure is 0.6-1.0 Mpa, and the stripping time is 5-20 min.
In the step (3), the primary washing pressure is 0.5-1.2 Mpa, and the washing time is 5-30 min. And (4) subtracting the water content of the ore from the water content of the dry slag per unit after operation to ensure the water balance of the cyaniding beneficiation flow, namely that the water of the front cyaniding beneficiation flow does not rise.
In the step (4), the secondary stripping pressure is 0.6-1.0 Mpa, and the stripping time is 3-15 min.
In the step (5), the secondary washing pressure is 0.5-1.2 Mpa, the secondary washing water amount is 1-5 times of the weight of the filter-pressing residue, and the washing time is 5-60 min.
In the step (6), the tertiary stripping pressure is 0.6-1.0 Mpa, the stripping time is 3-15 min, and the tertiary stripping pressure and the stripping time are the same as the secondary stripping parameters in the step (4), so that the water balance of the environment-friendly treatment system is ensured; the environment-friendly treatment system consists of a stirring reactor and a settling tank.
In the step (7), the high-efficiency cyanogen-breaking medicament CGHB01 is formed by adding persulfate and an activator in a certain formula on the basis of an indigenous medicament and a cyanogen-precipitating medicament, the addition amount of the medicament is determined according to the form and the content of cyanide in secondary washing liquid and is 3-15 times of the total cyanide mass, the treatment time is 30-120 min, and the adsorption treatment time of activated carbon is 30-180 min. And adsorbing and recovering the valuable metals such as Au, Ag and the like in the water in the environment-friendly treatment system.
Specific examples are as follows:
the main pollutant components of cyanide-containing tailing pulp of a certain gold mine are shown in table 1, the cyanide tailing leaching toxicity analysis results are shown in table 2, and the data in the table show that the main pollutants in the cyanide-containing tailing pulp are cyanide, COD, thiocyanide and the like and contain a certain amount of valuable metal ions such as gold, silver, copper and the like.
TABLE 1 analysis of the pollutant content of cyanide-containing tailing slurries
TABLE 2 cyanidation tailings leach toxicity analysis results
The elution treatment process of the invention adopts four filter presses to operate and implement, the operation parameters of the system filter pressing, air stripping and water washing process are shown in table 3, the operation parameters of the filter pressing water treatment process are shown in table 4, and the operation results are shown in fig. 1 and fig. 2.
TABLE 3 running parameter table of filter-pressing, blowing, dewatering and washing process
TABLE 4 running parameter table of filter-pressing water treatment process
As can be seen from fig. 1, the operation results of 30 shifts show that the total cyanide concentration in the leachate prepared by the toxicity leaching test of the filter-pressing residue is below 5mg/L, which meets the limit requirement of the treatment of the cyanide tailing pond in the gold industry cyanide pollution control technical specification (HJ 943-2018), and the operation results of respectively using clean water and treated water in the secondary washing show that the washing effect of the environment-friendly treated water on the filter-pressing residue is better than that of the clean water, because the residual high-efficiency cyanide breaking agent in the environment-friendly treated water has a long-term treatment effect on the filter-pressing residue.
The filter presses 2, 3 and 4 adopt a filter pressing air-stripping washing process, secondary washing water is recycled after cyanogen breaking treatment for secondary washing, and operation results of 30 shifts show that filter pressing residues can stably meet the limit requirement of treatment of a cyanogen slag tailing pond in technical Specification for pollution control of cyanogen slag in the gold industry (HJ 943-2018), and the standard reaching rate is 100%. Based on a one month analysis of the operating data, a multiple recycle of about 547.06g was calculated.
Claims (8)
1. A cyanidation tailing slurry innocent treatment process comprises the following specific steps:
(1) and (3) pumping the cyanide tailing slurry from the corner feeding pump into a filter press with washing and blow-off functions for filter pressing, returning the generated filtrate to the cyanide beneficiation production flow, and leaving the filter pressing residue in the filter press for the next operation.
(2) And (3) carrying out forward primary stripping on the filter pressing residues by utilizing an air blower, returning the generated primary stripping liquid to the cyaniding beneficiation production flow, and keeping the filter pressing residues in the filter pressing machine for the next operation.
(3) And (3) washing the filter-pressing residue once in a forward direction by using clear water, returning a washing liquid to a cyaniding mineral separation production flow, and keeping the filter-pressing residue in a filter press for the next operation.
(4) And (3) performing positive secondary stripping on the filter pressing residues by using an air blower, returning the generated secondary stripping liquid to the cyaniding beneficiation production flow, and keeping the filter pressing residues in the filter pressing machine for the next operation.
(5) And (3) performing positive secondary washing on the filter-pressing residues by utilizing the environment-friendly treatment water, returning the generated secondary washing liquid to the environment-friendly treatment system, and remaining the filter-pressing residues in the filter press for the next operation.
(6) And (3) blowing off the filter pressing residues three times in the forward direction by using an air blower, returning the generated three-time blowing-off liquid to the environment-friendly treatment system, and transferring and piling the filter pressing residues in a tailing pond when the filter pressing residues meet the requirement of the environment-friendly standard.
(7) The water in the environment-friendly treatment system is purified by adopting a high-efficiency cyanogen breaking medicament CGHB01, then is adsorbed by adopting activated carbon, valuable metals such as Au, Ag and the like in the water in the environment-friendly treatment system are recovered, and the treated water is used for carrying out positive secondary washing on filter-pressing residues.
2. The innocent treatment process for cyanidation tailing pulp according to claim 1, characterized in that: in the step (1), the feeding pressure of the cyanidation tailing slurry is 0.4-0.8 Mpa, the feeding mode is that the material is fed from the corner of one side of the filter press in the positive direction, and the feeding time is 10-80 min.
3. The innocent treatment process for cyanidation tailing pulp according to claim 1, characterized in that: in the step (2), the primary stripping pressure is 0.6-1.0 Mpa, and the stripping time is 5-20 min.
4. The innocent treatment process for cyanidation tailing pulp according to claim 1, characterized in that: in the step (3), the washing pressure of the first time clear water is 0.5-1.2 Mpa, and the washing time is 5-30 min. And (4) subtracting the water content of the ore from the water content of the dry slag per unit after operation to ensure the water balance of the cyaniding beneficiation flow, namely that the water of the front cyaniding beneficiation flow does not rise.
5. The innocent treatment process for cyanidation tailing pulp according to claim 1, characterized in that: in the step (4), the secondary stripping pressure is 0.6-1.0 Mpa, and the stripping time is 3-15 min.
6. The innocent treatment process for cyanidation tailing pulp according to claim 1, characterized in that: in the step (5), the secondary washing pressure is 0.5-1.2 Mpa, the secondary washing water amount is 0.3-1 time of the weight of the filter-pressing residue, and the washing time is 5-60 min.
7. The innocent treatment process for cyanidation tailing pulp according to claim 1, characterized in that: in the step (6), the tertiary stripping pressure is 0.6-1.0 Mpa, the stripping time is 3-15 min, and the tertiary stripping pressure and the stripping time are the same as the secondary stripping parameters in the step (4), so that the water balance of the environment-friendly treatment system is ensured; the environment-friendly treatment system consists of a stirring reactor and a settling tank.
8. The innocent treatment process for cyanidation tailing pulp according to claim 1, characterized in that: in the step (7), the high-efficiency cyanogen-breaking agent CGHB01 is formed by adding persulfate and an activating agent with a certain formula on the basis of an indigenous agent and a cyanogen-precipitating agent, the addition amount of the agent is determined according to the form and the content of cyanide in secondary washing liquid and is 2-5 times of the total cyanide mass, the treatment time is 30-120 min, the activated carbon adsorption treatment time is 30-180 min, and valuable metals such as Au, Ag and the like in water in the environment-friendly treatment system are adsorbed and recovered.
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| CN201811568486.3A CN111348770A (en) | 2018-12-21 | 2018-12-21 | Innocent treatment process for cyanidation tailing pulp |
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| CN201811568486.3A CN111348770A (en) | 2018-12-21 | 2018-12-21 | Innocent treatment process for cyanidation tailing pulp |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108147578A (en) * | 2017-12-08 | 2018-06-12 | 长春黄金研究院 | A kind of processing method of sludge containing cyanogens |
| CN108149027A (en) * | 2017-12-08 | 2018-06-12 | 长春黄金研究院 | A kind for the treatment of agent and take off processing method using the cyanogen-containing tailing wash heat of the medicament |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108147578A (en) * | 2017-12-08 | 2018-06-12 | 长春黄金研究院 | A kind of processing method of sludge containing cyanogens |
| CN108149027A (en) * | 2017-12-08 | 2018-06-12 | 长春黄金研究院 | A kind for the treatment of agent and take off processing method using the cyanogen-containing tailing wash heat of the medicament |
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Application publication date: 20200630 |