CN103301810B - Normal temperature and normal pressure regeneration method for activated carbon for gold extraction - Google Patents
Normal temperature and normal pressure regeneration method for activated carbon for gold extraction Download PDFInfo
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Abstract
The invention discloses a normal temperature and normal pressure regeneration method for activated carbon for gold extraction. According to the method, the problem of low economical property of a conventional high-temperature heat-method activated carbon regeneration reactor can be solved; high-efficiency activated carbon regeneration can be realized at normal temperature and normal pressure with low cost according to an advanced oxidization and chemical elution theory. The normal temperature and normal pressure regeneration method comprises the specific steps of: discharging the activated carbon for gold extraction to be regenerated into a reactor, and then injecting running water into the reactor; oxidizing the activated carbon in the reactor by injecting ozone into the reactor; after the oxidation is finished, discharging oxidation process water out of the reactor; chemically eluting the activated carbon in the reactor by an acidic eluting solution; after the chemical elution is finished, discharging the acidic eluting solution out of the reactor; and injecting running water into the reactor to rinse the activated carbon in the reactor, thus obtaining regenerated carbon.
Description
Technical field
Invention relates to a kind of regeneration method of active carbon, is specifically related to a kind of normal temperature and pressure renovation process carrying gold active carbon.
Background technology
Carbon-in-pulp process is one of main technique of gold industry production procedure both at home and abroad at present, and so-called carbon-in-pulp process refers to, in the leachate processing operation of chemical mineral processing, extract gold from from ore pulp with active carbon.Active carbon as the unique absorption carrier carrying noble metal in golden process, the Repeatability of itself quality factor and " absorption-resolve ", the cost of direct relation golden production and efficiency.
At present, gold industry, to repeating the active carbon proposing the rear adsorption activity decline of gold, generally all takes traditional hot recycling method activity recovery to ensure that its Reusability is in production cycle.But hot recycling method energy consumption is high, charcoal damages large, this kind of renovation process adopts the mode of high-temperature evaporation to degrade to the organic pollution of charcoal absorption simultaneously, and the toxic emission thereupon brought can cause secondary pollution; And hot recycling is owned by France in " dry type " regeneration technology, be difficult to form being connected of production process with gold extracting carbon " wet type " the waterpower continus convergence of golden production.
Summary of the invention
In view of this, the invention provides one and carry gold active carbon normal temperature and pressure renovation process, can at normal temperatures and pressures to the regeneration carrying gold active carbon and carry out low-consumption high-efficiency, energy consumption is low, does not have secondary pollution.
The idiographic flow of the method is:
Step one: to be regenerated gold active carbon of carrying is entered reactor, inject running water in reactor, ensures that in reactor, the to be regenerated mass ratio carrying gold active carbon and running water is 1:2-1:2.5;
Step 2: injection of ozone in reactor, be oxidized gold active carbon of carrying to be regenerated in reactor, described active carbon per ton needs the ozone amount of 100g-150g/ hour; Oxidization time is 60min-90min;
Step 3: after being oxidized, obtains the active carbon after being oxidized and oxidation technology water, discharges the oxidation technology water in reactor;
Step 4: implantation quality concentration is the acidic effluent liquid of 3%-5% in reactor, described acidic effluent liquid is hydrochloric acid or nitric acid; By acidic effluent liquid, chemical removal is carried out to the active carbon after oxidation; The described chemical removal time is 60min-90min;
Step 5: after chemical removal completes, obtains the active carbon after wash-out and acidic elution waste liquid; Discharge the acidic elution waste liquid in reactor;
Step 6: inject running water in reactor, the solid matter obtained after carrying out 2-4 rinsing to the active carbon after wash-out is regenerated carbon.
By the regenerated carbon that obtains in described step 6 at current density 16-18mA/cm
2condition under carry out the electrochemical treatments of 120min-180min.
In the oxidation technology water that described step 3 is discharged and step 6 rinsing complete after the washings of generation carry out magazins' layout, be separated and reclaim the solid suspension carried with water; Then the oxidation technology water after monitoring separation in real time and the acidity of washings, if its acidity is more than PH6-9; Be then that the alkaline water of 3%-5% neutralizes by adding mass concentration, the oxidation technology water after neutralization and washings recycle as running water.
In described step 4, the liquid level of the acidic effluent liquid of injection exceeds described active carbon upper level 20cm-30cm in reactor.
In described step 2, adopt the mode of mixed aeration to injection of ozone in reactor.
60 DEG C of warm water are adopted during rinsing in described step 6.
Beneficial effect:
(1) by method of the present invention, can regenerate gold extracting carbon under normal temperature and pressure conditions, thus save Activated Carbon Production raw material resources, decrease the secondary pollution that charcoal regenerative process is formed to greatest extent, and the suction gold production efficiency of golden production process can be significantly improved.Adopt the regenerated carbon that obtains of the method can be delivered directly to by waterpower simultaneously and put forward golden absorbing process section in golden production, thus realize and being connected of golden production process.
(2) the method is compared with traditional high-temperature hot method, can save mass energy, thus saves cost; Contrast prior art, adopt the method can make active carbon regenerating unit cost of investment reduction by 60%, operation and maintenance cost reduction by 70%, and the Production requirement of basic guarantee gold extracting carbon regeneration iodine number recovery rate >=85%, can be applied to the regenerating active carbon process of other purposes.
(3) after " oxidation-pickling " technique, increase " electrochemical treatments " technique, the regeneration effect of gold active carbon can be improved further.
Accompanying drawing explanation
Fig. 1 is the process chart of embodiment 1;
Fig. 2 is the process chart of embodiment 2.
Detailed description of the invention
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
The present embodiment provides a kind of normal temperature and pressure renovation process carrying gold active carbon, the method can solve existing high-temperature hot method regenerating active carbon reactor economy poor, utilize advanced oxidation and chemical removal principle, obtain efficient regenerating active carbon by normal temperature and pressure with cheap cost.
Realize the system that this renovation process adopts in the present embodiment to comprise: main treatment tank, trash eliminator, auxiliary water tank, storage acid tank, storage alkali tank, ozone generator, in and water tank and control module.Wherein, auxiliary water tank is connected with main treatment tank by pipeline, ozone generator is connected with main treatment tank, stores sour tank and is connected with main treatment tank by two separate pipelines, realizes the sour tank of storage respectively to main treatment tank, main treatment tank to the unilaterally connected store between sour tank.Main treatment tank by pipeline successively with trash eliminator and in be connected with water tank, in be connected with auxiliary water tank by pipeline with water tank, store alkali tank by pipeline with in be connected with water tank.In and water tank in be equipped with pH value sensor.On two pipelines on connecting line on connecting line between main treatment tank and auxiliary water tank, between main treatment tank and trash eliminator, between main treatment tank and storage acid tank, store alkali tank and in and the connecting line of water tank all check valve is installed.Above-mentioned all check valves and ozone generator, in and pH value sensor in water tank control by control module.
Described main treatment tank is for completing the oxidation-chemical removal-rinse cycle to gold extracting carbon; Trash eliminator, for collecting the impurity produced in regenerative process, reclaims the valuable substance of separating out and ensures reuse water quality simultaneously; Auxiliary water tank is for providing oxidation technology water needed for regenerative process and washings; Store sour tank for providing the acidic effluent liquid needed for chemical removal technique; Storage alkali tank for provide the waste liquid after to wash-out neutralize needed for alkaline water; Ozone generator is for providing the oxidant needed for the middle-and-high-ranking oxidation of gold extracting carbon regenerative process; Control system, for realizing the control to each technique unit, makes it require the regeneration of gold extracting carbon according to process.
Iodine number is the basic numerical value representing activated carbon adsorptive capacity, is detected the adsorption capacity judging the active carbon after regenerating in the present embodiment by iodine number.In iodine number detects, be 100% carry out relative value comparison with the iodine number of original active carbon.Usually by iodine number lower than 70% gold active carbon of carrying be called and carry golden poor charcoal.
Embodiment 1: to iodine number be 67% carry golden poor charcoal carry out " oxidation-pickling " two-step method regeneration:
Oxidation technology water and washings all adopt running water in the present embodiment, to be regenerated gold active carbon of carrying for after repeatedly carrying gold, iodine number be 67% carry golden poor charcoal.Its concrete technology flow process as shown in Figure 1, first by iodine number be 67% golden poor charcoal of carrying enter in main treatment tank, control module opens the check valve on auxiliary water tank and main treatment tank connecting line, in main treatment tank, inject running water by auxiliary water tank will carry golden poor charcoal and flood, ensure that the mass ratio carrying golden poor charcoal and running water in main treatment tank is close this check valve after 1:2.Start ozone generator, carry out chemical catalytic oxidation (per ton carry golden poor charcoal required ozone amount per hour be 150g) by microbubble aeration hybrid mode to the golden poor charcoal of carrying in main treatment tank, it is 1.5 hours that control module presets oxidization time (opening time that namely control module sets ozone generator is 1 hour).In the process, in main treatment tank carry golden poor charcoal the direct oxidation of ozone and because of put forward the free hydroxyl that golden poor charcoal produces ozone catalytic indirect oxidation effect under, degrade carrying each type organic that golden poor charcoal adsorbs.After completing organic matter degradation, obtain carrying golden poor charcoal and oxidation technology water after being oxidized, control module opens the check valve between main treatment tank and trash eliminator, closes this check valve after the oxidation technology water in main treatment tank is drained into trash eliminator.Then control module opens the sour tank of storage to the check valve on main treatment tank connecting line, in main treatment tank, implantation quality concentration is the hydrochloric acid of 5%, pickling is carried out to the golden poor charcoal of carrying after oxidation, carries this check valve of closedown after golden poor charcoal height about 20cm when hydrochloric acid liquid level exceeds in main treatment tank.By the immersion of 1.5 hours, the inorganic matter that golden poor charcoal adsorbs of carrying after oxidation is carried out parsing desorption.
After acid cleaning process completes, obtain the hydrochloric acid proposing golden poor charcoal and mass concentration decline after wash-out, control module opens main treatment tank to the check valve store on sour tank connecting line, by main treatment tank, the hydrochloric acid that mass concentration declines is drained back to the sour tank of storage, to treat again to utilize after supplementing eo-acid.This check valve of closedown after acid discharge completes, control module opens the check valve on auxiliary water tank and main treatment tank connecting line, injects running water carry out rinsing to the golden poor charcoal of carrying after pickling by auxiliary water tank in main treatment tank.To after wash-out propose continuous 4 rinsings of golden poor charcoal after obtain regenerated carbon and washings.Adopt GB/T 12496.8-1999 " mensuration of wood activated charcoal test method iodine sorption value " test to show, the iodine number of the regenerated carbon after " oxidation-pickling " two-step pretreatment returns to 85%.The regenerated carbon of discharging can be delivered directly to by waterpower and put forward golden absorbing process section in golden production, thus realizes and being connected of golden production process.Washings in main treatment tank are expelled to trash eliminator after cleaning and discharging by regenerated carbon.
For realizing recycling of washings and oxidation technology water, draining into oxidation technology water and the washings of trash eliminator, isolating by trash eliminator the solid suspension that carries with water and reclaiming; During oxidation technology water after separation and washings enter and water tank, the acidity of liquid during control system is monitored in real time and in water tank, if its acidity exceedes setting value 6, then control storage alkali tank in and water tank add basicity be 3% sodium hydroxide solution neutralize, the water after neutralization is got back to auxiliary water tank and is treated again to utilize.
Embodiment 2: to iodine number be 72% carry golden poor charcoal carry out " oxidation-pickling-electrochemistry " three-step approach regeneration
Oxidation technology hydromining tap water at normal temperature in the present embodiment, washings adopt the warm water of 60 DEG C; To be regenerated gold active carbon of carrying for after repeatedly carrying gold, iodine number be 72% carry golden poor charcoal.Add " electrochemical treatments " step in an embodiment at this, thus, increase electrochemical processing cell in systems in which, described electrochemical processing cell is connected with main treatment tank simultaneously.
Its concrete technology flow process as shown in Figure 2, first by iodine number be 72% golden poor charcoal of carrying enter in main treatment tank, in main treatment tank, inject running water by auxiliary water tank to carry golden poor charcoal flood described, ensure that the mass ratio carrying golden poor charcoal and running water in main treatment tank is 1:2.5.Start ozone generator, carry out chemical catalytic oxidation (per ton carry golden poor charcoal required ozone amount per hour be 100g) by the mixing of microbubble aeration to the golden poor charcoal of carrying in main treatment tank, it is 1 hour that control system presets oxidization time.In the process, in main treatment tank carry golden poor charcoal the direct oxidation of ozone and because of put forward the free hydroxyl that golden poor charcoal produces ozone catalytic indirect oxidation effect under, degrade carrying each type organic that golden poor charcoal adsorbs.After completing organic matter degradation, obtain be oxidized after carry golden poor charcoal and oxidation technology water, the oxidation technology water in main treatment tank is drained into trash eliminator.By store sour tank to implantation quality concentration in main treatment tank be 4% hydrochloric acid pickling is carried out to the golden poor charcoal of carrying after oxidation, hydrochloric acid liquid level exceeds in main treatment tank carries golden poor charcoal height about 25cm; By the immersion of 1 hour, the inorganic matter that golden poor charcoal adsorbs of carrying after oxidation is carried out parsing desorption.
After acid cleaning process completes, obtain the hydrochloric acid proposing golden poor charcoal and mass concentration decline after wash-out, the hydrochloric acid that mass concentration declines is drained back to after the sour tank of storage supplements eo-acid and treat again to utilize.After acid discharge completes, the warm water being injected 60 DEG C by auxiliary water tank in main treatment tank to after wash-out propose continuous 3 rinsings of golden poor charcoal after obtain regenerated carbon.
The regenerated carbon obtained after rinsing is entered electrochemical processing cell, at current density 16mA/cm
2carry out the electrochemical treatments of 2 hours under condition, obtain the regenerated carbon after electrochemical treatments.Adopt GB/T 12496.8-1999 " mensuration of wood activated charcoal test method iodine sorption value " test to show, the iodine number of the regenerated carbon after electrochemical treatments returns to 92.5%.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. carry a gold active carbon normal temperature and pressure renovation process, it is characterized in that, the idiographic flow of the method is:
Step one: to be regenerated gold active carbon of carrying is entered reactor, inject running water in reactor, ensures that in reactor, the to be regenerated mass ratio carrying gold active carbon and running water is 1:2-1:2.5;
Step 2: injection of ozone in reactor, be oxidized gold active carbon of carrying to be regenerated in reactor, described active carbon per ton needs the ozone amount of 100g-150g/ hour; Oxidization time is 60min-90min;
Step 3: after being oxidized, obtains the active carbon after being oxidized and oxidation technology water, discharges the oxidation technology water in reactor;
Step 4: implantation quality concentration is the acidic effluent liquid of 3%-5% in reactor, described acidic effluent liquid is hydrochloric acid or nitric acid; By acidic effluent liquid, chemical removal is carried out to the active carbon after oxidation; The described chemical removal time is 60min-90min;
Step 5: after chemical removal completes, obtains the active carbon after wash-out and acidic elution waste liquid; Discharge the acidic elution waste liquid in reactor;
Step 6: inject running water in reactor, the solid matter obtained after carrying out 2-4 rinsing to the active carbon after wash-out is regenerated carbon;
By the regenerated carbon that obtains in described step 6 at current density 16-18mA/cm
2condition under carry out the electrochemical treatments of 120min-180min.
2. one as claimed in claim 1 carries gold active carbon normal temperature and pressure renovation process, it is characterized in that, in the oxidation technology water that described step 3 is discharged and step 6 rinsing complete after the washings of generation carry out magazins' layout, be separated and reclaim the solid suspension carried with water; Then the oxidation technology water after monitoring separation in real time and the acidity of washings, if its acidity is more than PH6-9; Be then that the alkaline water of 3%-5% neutralizes by adding mass concentration, the oxidation technology water after neutralization and washings recycle as running water.
3. one as claimed in claim 1 carries gold active carbon normal temperature and pressure renovation process, and it is characterized in that, in described step 4, the liquid level of the acidic effluent liquid of injection exceeds described active carbon upper level 20cm-30cm in reactor.
4. one as claimed in claim 1 carries gold active carbon normal temperature and pressure renovation process, it is characterized in that, in described step 2, adopts the mode of mixed aeration to injection of ozone in reactor.
5. one as claimed in claim 1 carries gold active carbon normal temperature and pressure renovation process, it is characterized in that, adopts 60 DEG C of warm water in described step 6 during rinsing.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4058457A (en) * | 1976-12-01 | 1977-11-15 | Milton Manes | Recovery of activated carbon |
| CN102652916A (en) * | 2012-03-31 | 2012-09-05 | 南京工业大学 | Activated carbon regeneration device and process |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4058457A (en) * | 1976-12-01 | 1977-11-15 | Milton Manes | Recovery of activated carbon |
| CN102652916A (en) * | 2012-03-31 | 2012-09-05 | 南京工业大学 | Activated carbon regeneration device and process |
Non-Patent Citations (2)
| Title |
|---|
| 活性炭再生技术;唐志红等;《煤化工》;20040229(第1期);第43-46页 * |
| 黄金用活性炭再生技术现状及发展趋势;李延吉等;《黄金》;20071015;第28卷(第10期);全文 * |
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Effective date of registration: 20190729 Address after: 123126 Paishanlou Village, Xinmin Township, Fumeng County, Fuxin City, Liaoning Province Patentee after: Liaoning Paishanlou Gold Mining Co., Ltd. Address before: 100081 Industrial Building of Beijing Polytechnic University, 66 North Third Ring West Road, Haidian District, Beijing Co-patentee before: Liaoning Paishanlou Gold Mining Co., Ltd. Patentee before: Beijing Polytechnic Tongda Environment Technology Co., Ltd. |