CN112916213B - Carbon-neutralized mineral processing method - Google Patents
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- CN112916213B CN112916213B CN202110178527.3A CN202110178527A CN112916213B CN 112916213 B CN112916213 B CN 112916213B CN 202110178527 A CN202110178527 A CN 202110178527A CN 112916213 B CN112916213 B CN 112916213B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
Abstract
The invention discloses a processing method of carbon-neutralized minerals, which is characterized in that in the processing process of polymetallic sulphide ore minerals by using lime as a pH regulator, a roasting furnace is arranged on the processing site of the polymetallic sulphide ore minerals to roast limestone, and the roasting furnace is adoptedThe lime generated by roasting the limestone is used as a pH regulator to process polymetallic sulphide ore minerals, and simultaneously, the carbon dioxide generated by roasting the limestone is introduced into ore pulp to replace sulfuric acid for carbon neutralization so as to convert the carbon dioxide into calcium carbonate. The invention not only can ensure that the grade and the recovery rate of recoverable mineral are basically equivalent to those of the conventional lime-sulfuric acid method, but also can ensure that CO generated in the process of firing calcium carbonate into lime2The method has the advantages of effectively utilizing the waste lime, avoiding the waste lime to be discharged into the air, simultaneously reducing the pH value of the ore pulp without adding sulfuric acid, and effectively avoiding the influence of the sulfuric acid used in the conventional lime-sulfuric acid method on equipment corrosion, pipeline blockage and production safety.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a carbon-neutralized mineral processing method.
Background
For ore containing multiple recoverable minerals, the process of mineral flotation is a process of gradually separating multiple target minerals, such as: the flotation separation of the copper-lead-zinc-sulfur ore is to separate copper minerals (called copper concentrate), lead concentrates (called lead concentrate), zinc minerals (called zinc concentrate) and sulfur minerals (called sulfur concentrate) from the ore by adopting the technical means of crushing, grinding, flotation and the like; the flotation separation of the copper-zinc-sulfur ore is to separate copper minerals (called copper concentrate), zinc minerals (called zinc concentrate) and sulfur minerals (called sulfur concentrate) from the ore by adopting the technical means of crushing-flotation and the like; the flotation separation of copper-sulfur ore is to separate copper minerals (called copper concentrate) and sulfur minerals (called sulfur concentrate) from the ore by adopting technical means such as crushing-flotation and the like; the separation and flotation of polymetallic sulphide ores containing various recoverable minerals is a technical problem in the field of mineral flotation.
Flotation separation steps: the method comprises the steps of firstly grinding recoverable minerals to a degree close to monomer dissociation, then adding an inhibitor and a regulator to enable target minerals needing to be recovered to be in an activated state and enable other minerals and gangue to be in a suppressed state, and then adding a collecting agent and a foaming agent and inflating to enable the minerals in the activated state to float upwards, so that the minerals in the activated state are separated from the other minerals and gangue in the suppressed state. By analogy, the separation of various minerals is realized step by step.
The flotation separation of copper-lead-zinc-sulfur ore, copper-sulfur ore and lead-zinc-sulfur ore is characterized by that firstly various regulators (including pH regulator, inhibitor and activating agent) are added, then the high-selectivity collecting agent and reasonable technological process are adopted to finally implement flotation separation. The pH regulator which is most used in industry is lime, which has obvious effect and low price and is widely applied. At present, the mineral processing method of the multi-metal sulfide ore mainly comprises the following two methods:
(1) conventional lime-sulfuric acid process
The conventional mineral processing method of polymetallic sulphide ores is the conventional lime-sulfuric acid process as shown in fig. 1, but the method has at least the following disadvantages: lime is produced by firing calcium carbonate, so there will be a large amount of CO in the firing process2Discharge into the air, which causes CO in the air2Increase; secondly, during copper-sulfur separation and zinc-sulfur separation, the lime consumption is large, so that during pyrite flotation, a large amount of sulfuric acid is required to be added to reduce the pH value of ore pulp, so that efficient flotation recovery of pyrite can be realized, and pipeline blockage is easily caused; thirdly, sulfuric acid is a dangerous product, and the transportation and the production of the sulfuric acid are very problems, especially in remote areas, foreign areas and other areas, and the transportation and the production are more difficult.
(2) Low alkalinity flotation process replacing lime
In order to avoid using lime in the process of flotation of the polymetallic sulphide ore, researchers carry out a lot of work, flotation separation is realized under the condition of low alkalinity without adding lime by adopting other regulators and collectors, the process flow of the lime-substituted low alkalinity flotation method is shown in figure 2, the flotation method has certain effect on partial ores, but for many ores, the production cost is high, and the separation effect is poor.
Compared with the flotation process, the leaching process is added in the process for recovering various metals in gold-containing polymetallic sulfide ore (or concentrate), the more conventional process flow is cyanidation leaching-flotation process, lime as a pH regulator is added in the flotation process in addition to the flotation process, and the process steps are mainly as follows: firstly adding pH regulator lime, then adding cyanide to carry out cyaniding leaching, and recovering various metal sulfide minerals in tailings through size mixing and flotation after leaching; the use of lime as a pH modifier in the size-mixing-flotation process is similar to the flotation process described above and therefore also suffers from the drawbacks of the conventional lime-sulfuric acid process described above.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a processing method of carbon-neutralized minerals, which not only can ensure that the grade and the recovery rate of recoverable minerals are basically equivalent to those of the conventional lime-sulfuric acid method, but also can ensure that CO generated in the process of burning limestone (the main component is calcium carbonate) into lime2The method has the advantages of effectively utilizing the waste lime, avoiding the waste lime to be discharged into the air, simultaneously reducing the pH value of the ore pulp without adding sulfuric acid, and effectively avoiding the influence of the sulfuric acid used in the conventional lime-sulfuric acid method on equipment corrosion, pipeline blockage and production safety.
The purpose of the invention is realized by the following technical scheme:
a carbon-neutralized mineral processing process, comprising: in the processing process of the polymetallic sulphide ore mineral by taking lime as a pH regulator, a roasting furnace is arranged on the processing site of the polymetallic sulphide ore mineral to roast limestone (the main component is calcium carbonate), the lime generated by roasting the limestone is taken as the pH regulator to process the polymetallic sulphide ore mineral, and carbon dioxide generated by roasting the limestone is introduced into ore pulp to replace sulfuric acid to perform carbon neutralization so as to convert the carbon dioxide into carbonates such as calcium carbonate.
Preferably, the processing of the polymetallic sulphide ore minerals using lime as a pH modifier is a flotation process or a cyanidation leaching-flotation process.
Preferably, the processing of the polymetallic sulphide ore minerals using lime as a pH modifier comprises a flotation process of copper lead zinc sulphide ore, a flotation process of copper sulphur ore, a flotation process of lead zinc sulphide ore or a cyanidation leaching-flotation process of gold-containing polymetallic sulphide ore.
Preferably, for polymetallic sulphide oresGrinding the raw ore or the concentrate to obtain initial pulp, placing a roasting furnace at the mineral processing site of the polymetallic sulphide ore to roast limestone (mainly comprising calcium carbonate), adding lime produced by roasting the limestone (mainly comprising calcium carbonate) into the initial pulp to perform a mineral processing process, and roasting the limestone (mainly comprising calcium carbonate) to produce CO2The substituted sulfuric acid is introduced into the ore pulp after the primary mineral processing process for carbon neutralization, and then the secondary mineral processing process is carried out.
According to the technical scheme provided by the invention, the carbon-neutralized mineral processing method provided by the invention is characterized in that limestone (mainly calcium carbonate) is roasted and introduced into a mineral processing process (such as a flotation process or a cyanidation leaching-flotation process), calcium oxide generated by roasting the limestone (mainly calcium carbonate) is added into the flotation or cyanidation leaching process, the pH value of ore pulp is adjusted, the inhibition of pyrite, the separation of polymetallic ores or the cyanidation leaching of gold is realized, and CO generated by roasting the limestone2Then the mixture is fed into a stirring barrel before the pyrite flotation for carbon neutralization, and the aim is to absorb CO generated by roasting limestone (the main component is calcium carbonate) through alkaline oxides in the ore pulp2Meanwhile, the activation of the pyrite is realized, and the pyrite is efficiently recovered through flotation. The reaction process of the carbon neutralization mineral processing method is a cyclic process from calcium carbonate to calcium carbonate, so that CO is avoided2Is discharged into the air. If the limestone (calcium carbonate as main component) is calcined by using coal as fuel, CO generated by the limestone is generated2Can also be adsorbed by alkaline substances in the ore. Therefore, the invention not only can ensure that the grade and the recovery rate of the recoverable mineral are basically equivalent to those of the conventional lime-sulfuric acid method, but also can ensure that CO generated in the process of burning calcium carbonate into lime2The method has the advantages of effectively utilizing the waste lime, avoiding the waste lime to be discharged into the air, simultaneously reducing the pH value of the ore pulp without adding sulfuric acid, and effectively avoiding the influence of the sulfuric acid used in the conventional lime-sulfuric acid method on equipment corrosion, pipeline blockage and production safety.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of the principle flow of a conventional lime-sulfuric acid process in the prior art.
Fig. 2 is a schematic diagram of the principle flow of the low alkalinity flotation process in the prior art instead of lime.
Fig. 3 is a schematic view of the principle flow of the carbon-neutralized mineral processing method provided by the embodiment of the invention.
Fig. 4 is a schematic flow chart of a carbon neutral mineral processing method for performing preferential flotation on lead-zinc sulfide ore according to embodiment 1 of the present invention.
Fig. 5 is a schematic flow chart of a carbon neutral mineral processing method for performing preferential flotation on copper lead zinc sulfide ore according to embodiment 2 of the invention.
Fig. 6 is a schematic flow diagram of a process for processing carbon neutral minerals for the preferential flotation of copper sulfur ores as provided in example 3 of the present invention.
Fig. 7 is a schematic flow chart of a carbon neutral mineral processing method for cyanidation leaching-flotation of gold-containing lead-zinc sulfide ore provided in example 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The carbon-neutralized mineral processing method provided by the present invention is described in detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
A process for processing carbon-neutralized minerals integrates environmental protection and high-efficiency recovery, i.e. under the condition that lime is used as the necessary condition for the floatation separation of polymetallic sulfide ore or the leaching of gold-containing sulfide ore, the whole process of front-stage lime inhibition, rear-end carbon dioxide activation and carbon neutralization is realized by roasting limestone (mainly calcium carbonate). The method comprises the steps of feeding lime obtained through roasting into ore pulp to adjust the pH value of the ore pulp and inhibit partial minerals from floating upwards, activating useful minerals which need to be recovered in rear-end ore pulp by using carbon dioxide obtained through roasting, neutralizing the carbon dioxide by using alkaline substances in the ore pulp, and finally realizing efficient recovery and carbon neutralization and protecting the environment.
A carbon-neutralized mineral processing process, comprising: in the processing process of the polymetallic sulphide ore mineral by taking lime as a pH regulator, a roasting furnace is arranged on the processing site of the polymetallic sulphide ore mineral to roast limestone (the main component is calcium carbonate), the lime generated by roasting the limestone is taken as the pH regulator to process the polymetallic sulphide ore mineral, and simultaneously carbon dioxide generated by roasting the limestone is introduced into ore pulp before pyrite flotation to replace sulfuric acid to carry out pyrite activation and carbon neutralization, so that the carbon dioxide is converted into carbonate.
Wherein the processing process of the polymetallic sulphide ore minerals by using lime as a pH regulator is a flotation process or a cyanidation leaching-flotation process. The processing process of the polymetallic sulphide ore minerals by using lime as the pH regulator can be a copper-lead-zinc-sulphur ore flotation process, a copper-sulphur ore flotation process, a lead-zinc-sulphur ore flotation process or a cyaniding leaching-flotation process of gold-containing polymetallic sulphide ores.
Specifically, as shown in fig. 3, the carbon-neutral mineral processing method includes grinding raw ore or concentrate of a polymetallic sulfide ore to prepare an initial slurry, installing a roasting furnace at a mineral processing site of the polymetallic sulfide ore, putting limestone (calcium carbonate) into the roasting furnace to roast lime (i.e., calcium oxide), and collecting the limeCO produced during calcination2Lime produced by roasting is added to the initial pulp to perform a liming process (including flotation or cyanidation leaching), a portion of the concentrate product of recoverable mineral is separated or gold is leached from the mineral, and the CO produced by the roasting is then used2The method comprises the steps of introducing the replacement sulfuric acid into ore pulp subjected to a lime mineral processing process, neutralizing alkaline substances in the ore pulp by carbon neutralization, stirring and activating, and then performing a mineral processing process (mainly a flotation process) after lime influence is eliminated to separate out a concentrate product of the residual recoverable minerals.
Furthermore, in order to reduce the emission of carbon dioxide and effectively realize the high-efficiency separation of the polymetallic ores, the invention provides the processing method of the carbon-neutralized minerals, which not only ensures the high-efficiency separation of sulfide ores, but also realizes the carbon neutralization, meets the overall national target of reducing the emission of the carbon dioxide, and has obvious effect on the smoothness of production and industrial pipelines in remote areas. The carbon-neutralized mineral processing method provided by the invention is characterized in that: limestone (the main component is calcium carbonate) is roasted and introduced into an ore dressing process (such as a flotation process or a cyaniding leaching-flotation process), calcium oxide is obtained through the roasting rear end and added into the flotation or cyaniding leaching process, the pH value of ore pulp is adjusted, and the inhibition of pyrite, the separation of polymetallic ore or the cyaniding leaching of gold is realized; CO obtained at the front end of the roasting furnace2Without emptying, the ore is fed into a stirring barrel before pyrite flotation for carbon neutralization, and the aim is to absorb CO discharged from the front end of a roasting furnace through alkaline oxides in the ore2Meanwhile, the activation of the pyrite is realized, and the pyrite is efficiently recovered through flotation. The reaction process of the invention is a cyclic process from calcium carbonate to calcium carbonate, thereby avoiding CO2Discharged into the air, see the following reaction formulas (1), (2) and (3). If coal is used as fuel in the roasting process, CO produced by the coal is generated2Can also be adsorbed by alkaline substances in the ore (such as metal oxides in the ore, iron oxides or hydroxides generated in the ore grinding process, and the like).
A roasting reaction formula: CaCO3＝CaO+CO2 (1)
Reaction in ore pulp: CaO + H2O＝Ca(OH)2 (2)
Carbon neutralization reaction formula: ca (OH)2+CO2＝CaCO3+H2O (3)
Performance detection
In order to determine the rationality of the processing method of the carbon neutral minerals provided by the present invention, the flotation comparative tests of the processing method of the carbon neutral minerals of the present invention, the low alkalinity flotation method of the prior art for replacing lime and the conventional lime-sulfuric acid method of the prior art were carried out with a certain lead-zinc sulfide ore as a raw ore, and the results are shown in the following table 1:
TABLE 1
From table 1 above, the following conclusions can be drawn:
(1) compared with the conventional lime-sulfuric acid method in the prior art, the carbon-neutralized mineral processing method has the advantages that the grade and recovery rate of lead and zinc are basically equivalent, but the recovery rate of sulfur is improved by 1.38 percent; the conventional lime-sulfuric acid method in the prior art can cause 100 percent of carbon dioxide to be discharged into the atmosphere, and the sulfuric acid can cause great influence on equipment corrosion, pipeline blockage and production safety, but the carbon neutral mineral processing method can completely avoid CO2When the sulfuric acid is discharged into the atmosphere, the influence of the sulfuric acid on equipment corrosion, pipeline blockage and production safety can be effectively avoided.
(2) Compared with the low-alkalinity flotation method for replacing lime in the prior art, the processing method for the carbon-neutralized minerals has higher lead-zinc-sulfur grade and recovery rate than the low-alkalinity flotation method for replacing lime in the prior art, and the main reason is that lime is not added, so that pyrite is difficult to inhibit during lead-zinc-sulfur separation flotation, and lead concentrate is causedThe ore lead grade and the zinc concentrate zinc grade are greatly reduced, the product quality is seriously influenced, and the sulfur recovery rate is greatly reduced because a large amount of pyrite enters the lead and zinc concentrates; however, the low alkalinity flotation method for replacing lime in the prior art does not add lime, so CO does not exist2The problem of emissions.
In conclusion, the embodiment of the invention can not only ensure that the grade and the recovery rate of the recoverable mineral are basically equivalent to those of the conventional lime-sulfuric acid method, but also ensure that CO generated in the process of burning limestone (the main component is calcium carbonate) into lime2The method has the advantages of effectively utilizing the waste lime, avoiding the waste lime to be discharged into the air, simultaneously reducing the pH value of the ore pulp without adding sulfuric acid, and effectively avoiding the influence of the sulfuric acid used in the conventional lime-sulfuric acid method on equipment corrosion, pipeline blockage and production safety.
In order to more clearly show the technical scheme and the technical effects provided by the invention, the carbon-neutralized mineral processing method provided by the embodiment of the invention is described in detail by specific embodiments.
Example 1
As shown in fig. 4, a process for processing carbon neutral minerals is used for the preferential flotation of lead-zinc sulfide ores, and the specific flotation process comprises the following steps: grinding the raw ore of the lead-zinc sulfide ore to prepare raw ore pulp, arranging a roasting furnace on the flotation site of the lead-zinc sulfide ore, roasting limestone in the roasting furnace, and collecting CO generated in the roasting process2(ii) a Adding the lime generated by roasting into raw ore pulp for lead flotation to obtain lead concentrate; then adding the lime generated by roasting into tailing slurry after lead flotation for zinc flotation to obtain zinc concentrate; then the CO generated in the roasting process is treated2Introducing into tailing slurry after zinc flotation (the tailing slurry after zinc flotation contains 28.85% of sulfur, the pH value of the ore slurry is 11.9, and the concentration of calcium ions is 1193mg/L) to carry out closed stirring for 10 minutes, and adding 150g/t collecting agent butyl xanthate-dry oresAnd carrying out primary sulfur roughing to obtain high-quality iron sulfide concentrate with the sulfur grade of 47.28% and the sulfur operation recovery rate of 96.57%.
Specifically, compared with the prior art that the lead-zinc sulfide ore is subjected to preferential flotation by adopting a conventional lime-sulfuric acid method, the lead grade and the lead recovery rate of the lead-zinc sulfide ore are basically equivalent, the zinc grade and the zinc recovery rate of the lead-zinc sulfide ore are basically equivalent, and the sulfur grade of the lead-zinc sulfide ore is basically equivalent, but the sulfur recovery rate of the embodiment 1 of the invention is improved by nearly 0.8 percent. Calcination to produce CO2The neutralization rate can reach 100 percent, and CO2Is absorbed by oxides and hydroxides such as calcium, magnesium, iron and manganese in the ore.
Example 2
As shown in fig. 5, a process for processing carbon-neutralized minerals is used for performing a preferential flotation process on a copper-lead-zinc sulfide ore, and the specific flotation process comprises the following steps: grinding the raw ore of the copper-lead-zinc sulfide ore to prepare raw ore pulp, arranging a roasting furnace on the flotation site of the copper-lead-zinc sulfide ore, roasting limestone in the roasting furnace, and collecting CO generated in the roasting process2(ii) a Adding the lime generated by roasting into the raw ore pulp for copper flotation to obtain copper concentrate; then adding the lime generated by roasting into tailing slurry after copper flotation for lead flotation to obtain lead concentrate; adding the lime generated by roasting into tailing slurry after lead flotation for zinc flotation to obtain zinc concentrate; then the CO generated in the roasting process is treated2Introducing into tailing slurry after zinc flotation (the tailing slurry after zinc flotation contains 25.8% of sulfur, the pH value of the ore slurry is 12.2, and the concentration of calcium ions is 1282mg/L) to carry out closed stirring for 10 minutes, and adding 120g/t collecting agent butyl xanthate-dry oresAnd carrying out primary sulfur roughing to obtain high-quality iron sulfide concentrate with 46.98% of sulfur grade and 95.86% of sulfur operation recovery rate.
Specifically, in example 2 of the present invention, compared with the prior art in which the prior art is adopted to perform the preferential flotation on the copper-lead-zinc sulfide ore by the conventional lime-sulfuric acid method, the copper grade and the copper recovery rate of the copper-lead-zinc sulfide ore are basically equivalent, the lead grade and the lead recovery rate of the copper-lead-zinc sulfide ore are basically equivalent, the zinc grade and the zinc recovery rate of the zinc-lead-zinc sulfide ore are basically equivalent, and the sulfur grade of the zinc-lead-zinc sulfide ore is basically equivalent, but the sulfur recovery rate of example 2 of the present invention is improved by nearly 0.5%. CO is generated by roasting in a roasting furnace2The neutralization rate can reach 100 percent, and CO2Is absorbed by oxides and hydroxides such as calcium, magnesium, iron and manganese in the ore.
Example 3
As shown in fig. 6, a process for processing carbon neutral minerals for the preferential flotation of a copper-sulfur ore includes: grinding the raw ore of the copper-sulfur ore to prepare raw ore pulp, arranging a roasting furnace on the flotation site of the copper-sulfur ore, roasting limestone in the roasting furnace, and collecting CO generated in the roasting process2(ii) a Adding the lime generated by roasting into the raw ore pulp for copper flotation to obtain copper concentrate; then the CO generated in the roasting process is treated2Introducing into copper flotation tailing slurry (containing 18.3% of sulfur, pH value of the slurry 11.3, calcium ion concentration 923mg/L) to perform closed stirring for 10 min, and adding collecting agent butyl xanthate 90g/t-dry oresAnd carrying out primary sulfur roughing to obtain high-quality iron sulfide concentrate with the sulfur grade of 43.89% and the sulfur operation recovery rate of 93.73%.
Example 4
As shown in fig. 7, a carbon neutral mineral processing method is used for cyanidation leaching-flotation of a gold-bearing lead-zinc sulfide ore, and the specific flotation process comprises the following steps: grinding the raw ore of the gold-containing lead-zinc sulfide ore to obtain raw ore pulp, arranging a roasting furnace on the flotation site of the gold-containing lead-zinc sulfide ore, roasting limestone in the roasting furnace, and collecting CO generated in the roasting process2(ii) a Adding lime generated by roasting into raw ore pulp to carry out cyaniding gold leaching to obtain gold-containing pregnant solution; then adding the lime generated by roasting into tailing slurry after gold leaching for lead flotation and cyanogen removal to obtain lead concentrate; adding the lime generated by roasting into tailing slurry after lead flotation for zinc activation flotation to obtain zinc concentrate; then the CO generated in the roasting process is treated2Introducing into tailing slurry after zinc activation flotation (the tailing slurry after zinc activation flotation contains 23.1% of sulfur, the pH value of the ore slurry is 11.7, and the concentration of calcium ions is 1076mg/L), stirring for 10 minutes in a closed manner, and adding 120g/t of butyl xanthate serving as a collecting agent-dry oresAnd carrying out primary sulfur roughing to obtain high-quality iron sulfide concentrate with the sulfur grade of 44.73% and the sulfur operation recovery rate of 94.16%.
In conclusion, the embodiment of the invention can not only ensure that the grade and the recovery rate of the recoverable mineral are basically equivalent to those of the conventional lime-sulfuric acid method, but also ensure that CO generated in the process of burning calcium carbonate into lime2The method has the advantages of effectively utilizing the waste lime, avoiding the waste lime to be discharged into the air, simultaneously reducing the pH value of the ore pulp without adding sulfuric acid, and effectively avoiding the influence of the sulfuric acid used in the conventional lime-sulfuric acid method on equipment corrosion, pipeline blockage and production safety.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. A carbon-neutralized mineral processing method is characterized by comprising the following steps: in the process of processing the polymetallic sulphide ore minerals by using lime as a pH regulator, a roasting furnace is arranged on a polymetallic sulphide ore mineral processing site for roasting limestone, the lime generated by roasting the limestone is used as the pH regulator for processing the polymetallic sulphide ore minerals, the restraint of pyrite, the separation of polymetallic ores or the cyaniding leaching of gold is realized, simultaneously, carbon dioxide generated by roasting the limestone is introduced into ore pulp before the flotation of rear-end pyrite to replace sulfuric acid for carbon neutralization, the ore pulp is not discharged into the air, the addition of sulfuric acid is not needed to reduce the pH value of the ore pulp, and CO generated by roasting the roasting furnace is absorbed by alkaline oxides in the ore pulp2Neutralizing to convert carbon dioxide into carbonate, activating pyrite, and recovering pyrite by flotation;
the processing process of the polymetallic sulphide ore mineral by using lime as a pH regulator refers to a cyanidation leaching-flotation process of the polymetallic sulphide ore containing gold.
2. The process of claim 1, wherein the raw ore or concentrate of the polymetallic sulphide ore is ground to form an initial slurry, the roaster is placed at the site of mineral processing of the polymetallic sulphide ore to roast limestone, lime produced by roasting the limestone is added to the initial slurry to perform a stage of mineral processing, and CO produced by roasting the limestone is added to the initial slurry to process the mineral2The substituted sulfuric acid is introduced into the ore pulp after the primary mineral processing process for carbon neutralization, and then the secondary mineral processing process is carried out.
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