CN108296026A - A kind of low zinc high type difficulty of lead selects the method for floating of Pb-Zn deposits - Google Patents

Abstract

The present invention provides the method for floating that a kind of low zinc high type difficulty of lead selects Pb-Zn deposits, including：PH regulators, current potential regulator, collecting agent, foaming agent are added in the ore pulp of Pb-Zn deposits and carries out lead minerals diffeential floatation, during being somebody's turn to do, slurry pH is adjusted to 9~11, and is adjusted the current potential of flotation pulp to 210~350mv using potassium permanganate as current potential regulator, obtains lead concentrate.The product dehydration of the above process is back to lead minerals diffeential floatation process.Then, pH regulators, activator, collecting agent, foaming agent are added in lead minerals diffeential floatation tailing and carries out zinc mineral flotation, and dehydration is carried out to product and is back to zinc mineral floatation process.Regulate and control pulp potential by potassium permanganate and carry out flotation, there is Pb-Zn separation to be easy, lead minerals diffeential floatation process without add inhibitor, floating agent loss less, the advantages such as medicament recovery utilization rate height.

Description

A kind of flotation method of lead-low-zinc high-type refractory lead-zinc ore

technical field

The invention relates to the field of lead-zinc ore beneficiation, and in particular to a flotation method for lead-low-zinc and high-type refractory lead-zinc ore.

Background technique

Flotation is the most commonly used beneficiation method for lead-zinc sulfide ores. In the flotation process, because the natural floatability of lead minerals is better than that of zinc minerals, lead-zinc sulfide ores usually adopt the priority of "floating lead and suppressing zinc". Flotation process, that is: first use inhibitors to suppress zinc minerals and then float lead minerals, and then use activators to activate the suppressed zinc minerals and then recover zinc minerals. Patent CN103817013A discloses a lead-zinc ore flotation method. By adding zinc sulfate, sodium pyrosulfite and sodium sulfide as inhibitors to suppress the flotation of zinc, zinc minerals are suppressed and lead minerals are separated by optimal flotation process flotation.

However, the above method is only suitable for processing ordinary lead-zinc sulfide ores, and for lead-zinc ores with lower lead grades and higher zinc grades, lead-low-zinc high-type refractory lead-zinc ores, the use of zinc-inhibited minerals is preferred for flotation of lead The following problems will exist in the priority flotation process of minerals: 1) Due to the high content of zinc minerals in the raw materials, in the process of priority flotation of lead minerals in the "floating lead suppressing zinc" lead mineral priority flotation process, in order to avoid excessive zinc content in the lead concentrate, it is necessary to add A large number of inhibitors inhibit zinc minerals, resulting in high cost of flotation reagents; 2) The priority flotation process of lead-zinc ores is after the lead minerals priority flotation process of "floating lead and zinc suppression", and zinc mineral flotation process is required Recovery of zinc minerals. However, due to the addition of a large amount of inhibitors to inhibit the flotation activity of zinc minerals in the priority flotation stage of lead minerals, a large amount of activators need to be added to activate the previously inhibited zinc minerals during the flotation process of zinc minerals, which further increases the cost of flotation reagents; 3) When a large amount of activators are added to activate zinc minerals during the flotation process of zinc minerals, the activators will also activate impurity minerals such as pyrite and pyrrhotite at the same time, causing a large amount of impurity minerals to enter the zinc concentrate, making the zinc concentrate The grade is low and the quality is poor; 4) A large amount of inhibitors added in the lead mineral priority flotation stage and a large amount of activator added in the zinc mineral flotation stage will lead to excessively high pollutant content in the mineral processing wastewater, causing serious environmental pollution.

Contents of the invention

The purpose of the present invention is to provide a kind of flotation method of lead-low-zinc and high-type refractory lead-zinc ore. This flotation method is suitable for lead-low-zinc and high-type lead-zinc ore, and can quickly separate grade and High recovery lead concentrate and zinc concentrate products.

The present invention solves its technical problems by adopting the following technical solutions.

The present invention proposes a kind of flotation method of lead-low-zinc high-type refractory lead-zinc ore, comprising the following steps:

S1, Priority flotation of lead minerals: After grinding the lead-zinc ore, add pH regulator, potential regulator, collector and foaming agent to carry out preferential flotation of lead minerals to obtain lead concentrate and lead minerals priority flotation Tailings selection, wherein the potential regulator is potassium permanganate, the potential regulator adjusts the potential of the flotation pulp to 210-350mv, and the pH regulator adjusts the pH value of the flotation pulp to 9-11;

S2, dehydration: the lead concentrate and lead mineral priority flotation tailings are dehydrated respectively, and combined to obtain the first wastewater, and the first wastewater is reused in the lead mineral priority flotation process in step S1;

S3, zinc mineral flotation: adding pH adjuster, activator, collector and foaming agent to lead mineral priority flotation tailings to carry out zinc mineral flotation to obtain zinc concentrate and zinc mineral flotation tailings;

S4, dehydration: the zinc concentrate and zinc mineral flotation tailings are dehydrated respectively, and combined to obtain second wastewater, which is reused for the zinc mineral flotation process in step S3.

The beneficial effect of the flotation method of the lead-low-zinc high-type refractory lead-zinc ore of the embodiment of the present invention is:

In the flotation slurry environment with high pH value (pH value 9-11) and high potential (210-350mv) of lead-zinc ore, the floatability of lead minerals is significantly higher than that of zinc minerals and other minerals. Under this condition, lead-zinc flotation separation is less difficult. The existing lead-zinc flotation separation usually uses lime, sodium carbonate or sodium hydroxide to adjust the pH value of the flotation pulp to 9-12 for flotation, but at this time the potential of the pulp is usually a low potential level of -150-50mv, so Lead-zinc flotation separation is still difficult. For low-lead and high-type lead-zinc mines, it is necessary to use a large amount of inhibitors to suppress zinc minerals to achieve lead-zinc flotation separation. The invention can ensure that the pulp potential is also adjusted to a high potential level (210-350mv) when the pulp has a high pH value (pH value is 9-11) by adding a potential regulator, so that the lead-zinc flotation separation is easy. More importantly, the present invention uses potassium permanganate as a potential regulator. Potassium permanganate can not only effectively increase the potential of the pulp, but also suppress impurities such as zinc minerals and pyrite to a certain extent. Therefore, in In the process of preferential flotation of lead minerals, there is no need to add additional inhibitors to inhibit the flotation of impurities such as zinc minerals, and the grade and recovery rate of lead concentrate are relatively ideal.

In the prior art, common zinc mineral inhibitors such as zinc sulfate and sulfite are used to inhibit the surface of mineral particles. With the continuous separation of concentrate and tailings during the flotation process, a large number of inhibitors are attached to the minerals. The surface of the particles is also separated, so the loss of the inhibitor is large, and it is not easy to recycle. The pH regulator and the potential regulator in the present invention mainly act on the flotation pulp solution to provide a high pH value and high potential pulp environment for the flotation process. In the flotation process, the pH regulator and the potential regulator It will not be lost with the discharge of the concentrate and tailings, but will remain in the slurry solution in large quantities, which is convenient for recycling.

Based on the mechanism of action of the above-mentioned flotation reagents, the products of the lead mineral flotation process and the zinc mineral flotation process are dehydrated, and the recovered wastewater is continued to be reused in their respective flotation processes, which greatly reduces the use of reagents. amount, and effectively avoid the interference of different flotation processes by wastewater with different chemical components.

And because no inhibitor is added in the process of preferential flotation of lead minerals, and the inhibitory effect of potassium permanganate on zinc minerals is relatively weak, in the subsequent flotation process of zinc minerals, only a small amount of activator is needed to activate zinc Minerals, and effectively prevent impurities such as pyrite and pyrrhotite from being activated, and effectively reduce the impurity content in zinc concentrate.

In summary, the technology used in the present invention makes the lead-low-zinc and high-type refractory lead-zinc ore in the flotation process easy to separate lead and zinc, the priority flotation process of lead minerals does not need to add inhibitors, the loss of flotation reagents is small, and the main flotation reagents It can be effectively recycled, the amount of activator used in the zinc mineral flotation process is small, the quality of lead concentrate and zinc concentrate is good, the recycling rate of mineral processing wastewater is high, and the environmental pollution is small.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a process flow chart of the flotation method for lead-low-zinc and high-type refractory lead-zinc ore provided by the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

The flotation method of the lead-low-zinc and high-type refractory lead-zinc ore in the embodiment of the present invention will be described in detail below.

A method for flotation of lead-low-zinc and high-type refractory lead-zinc ore provided by the embodiment of the present invention comprises the following steps:

S1, Priority flotation of lead minerals: After grinding the lead-zinc ore, add pH regulator, potential regulator, collector and foaming agent to carry out preferential flotation of lead minerals to obtain lead concentrate and lead minerals priority flotation Tailings selection, wherein the potential regulator is potassium permanganate, the potential regulator adjusts the potential of the flotation pulp to 210-350mv, and the pH regulator adjusts the pH value of the flotation pulp to 9-11;

S2, dehydration: the lead concentrate and lead mineral priority flotation tailings are dehydrated respectively, and combined to obtain the first wastewater, and the first wastewater is reused in the lead mineral priority flotation process in step S1;

S3, zinc mineral flotation: adding pH adjuster, activator, collector and foaming agent to lead mineral priority flotation tailings to carry out zinc mineral flotation to obtain zinc concentrate and zinc mineral flotation tailings;

S4, dehydration: the zinc concentrate and zinc mineral flotation tailings are dehydrated respectively, and combined to obtain second wastewater, which is reused for the zinc mineral flotation process in step S3.

Further, in a preferred embodiment of the present invention, in step S1, the particle size of the lead-zinc ore grinding product is -0.074 mm, accounting for 65-90%.

Further, in a preferred embodiment of the present invention, in step S1, the pH adjusting agent is lime, the collector is ethiazide, and the foaming agent is selected from pine alcohol oil, No. 2 oil, methyl amyl alcohol, butyl ether One or more of the oils. Lime not only has the function of adjusting the pH value of the pulp, but also can inhibit pyrite, pyrrhotite and other minerals, so that the lead concentrate and zinc concentrate have less impurities and higher grades.

Further, in a preferred embodiment of the present invention, in step S1, during the preferential flotation process of lead minerals, the pH regulator adjusts the flotation pulp to a pH value of 9-11, and the amount of collector is 10-50g/ t, the dosage of foaming agent is 1-10g/t. By adjusting the dosage ratio of the reagents, the effect of preferential flotation of lead minerals can be effectively guaranteed. Under this amount, the lead minerals in the lead-zinc sulfide ore can be effectively separated.

Further, in a preferred embodiment of the present invention, in step S1, the potential regulator adjusts the potential of the flotation pulp to 320-350mv, and the pH regulator adjusts the pH value of the flotation pulp to 10-11, the potential Level and pH environment, it can improve the separation effect of lead and zinc, and further improve the quality of lead concentrate and zinc concentrate.

Further, in a preferred embodiment of the present invention, the process of preferential flotation of lead minerals includes 1 roughing process, 2-4 refining processes, and 1-2 sweeping processes.

Further, in a preferred embodiment of the present invention, in step S3, the pH adjusting agent is lime, the activator is copper sulfate, the collector is one or a mixture of ethiazide and butyl xanthate, and the foaming agent is selected from One or more of pine alcohol oil, No. 2 oil, methyl amyl alcohol, and butyl ether oil.

Further, in a preferred embodiment of the present invention, in step S3, the pH regulator adjusts the pulp to a pH value of 9-11, the dosage of the activator is 10-60 g/t, and the dosage of the collector is 20-80 g /t, the amount of foaming agent is 5~20g/t. In the process of preferential flotation of lead minerals, potassium permanganate is used as the potential regulator, which has little inhibitory effect on zinc minerals. Therefore, in this process, only a small amount of activator and other agents can be added to achieve zinc flotation. Good separation of minerals.

Further, in a preferred embodiment of the present invention, the zinc mineral flotation process includes 1 roughing, 2-4 beneficiation, and 1-2 sweeping processes.

The characteristics and performance of the present invention will be described in further detail below in conjunction with the examples.

Example 1

The flotation method of a kind of lead-low-zinc high-type refractory lead-zinc ore provided by the present embodiment comprises the following steps:

(1) Grind the lead-zinc ore with a lead grade of 1.19% and a zinc grade of 4.12% until the particle size is -0.074mm, accounting for 70%, then add lime to adjust the pH value of the pulp to 10.5, and add potassium permanganate to adjust the pulp potential to 260mv , and then add 20 g/t of ethyl disulfide nitrogen and 5 g/t of terpineol oil to carry out preferential flotation of lead minerals. The flotation process includes 1 roughing, 3 times of beneficiation, and 2 times of sweeping;

(2) carry out dehydration treatment respectively to the lead concentrate that lead mineral priority flotation obtains and lead mineral priority flotation tailings, merge the waste water that two kinds of products remove, and it is reused in lead mineral priority flotation process;

(3) Add lime to the tailings of lead mineral priority flotation to adjust the pH value of the slurry to 10.5, the dosage of copper sulfate is 35g/t, the dosage of ethyl disulfide nitrogen is 50g/t, and the dosage of terpineol oil is 10g/t. Flotation, the flotation process includes 1 roughing, 3 fine selections, and 2 sweeping processes;

(6) The zinc concentrate and zinc mineral flotation tailings obtained by zinc mineral flotation are dehydrated separately, and the wastewater removed by the two products is combined and reused in the zinc mineral flotation process.

The above process and chemical conditions were used to test, and the results showed that the lead-zinc minerals could be effectively separated, and the lead-zinc ore with a lead grade of 1.19% and a zinc grade of 4.12% could be processed to obtain a lead concentrate with a lead grade of 46.69% and a lead recovery rate of 90.17%. ore and zinc concentrate with a zinc grade of 49.92% and a zinc recovery rate of 88.67%.

Example 2

The flotation method of a kind of lead-low-zinc high-type refractory lead-zinc ore provided by the present embodiment comprises the following steps:

(1) Grind the lead-zinc ore with a lead grade of 1.07% and a zinc grade of 3.94% until the particle size is -0.074mm, accounting for 80%, then add lime to adjust the pH value of the pulp to 9, and add potassium permanganate to adjust the pulp potential to 280mv , and then add 20 g/t of ethyl disulfide nitrogen and 5 g/t of terpineol oil to carry out preferential flotation of lead minerals. The flotation process includes 1 roughing, 3 times of beneficiation, and 2 times of sweeping;

(2) carry out dehydration treatment respectively to the lead concentrate that lead mineral priority flotation obtains and lead mineral priority flotation tailings, merge the waste water that two kinds of products remove, and it is reused in lead mineral priority flotation process;

(3) Add lime to the tailings of lead mineral priority flotation to adjust the pH value of the slurry to 10.5, the dosage of copper sulfate is 35g/t, the dosage of ethyl disulfide nitrogen is 50g/t, and the dosage of terpineol oil is 10g/t. Flotation, the flotation process includes 1 roughing, 3 fine selections, and 2 sweeping processes;

(6) The zinc concentrate and zinc mineral flotation tailings obtained by zinc mineral flotation are dehydrated separately, and the wastewater removed by the two products is combined and reused in the zinc mineral flotation process.

The above process and chemical conditions were used to test, and the results showed that lead-zinc minerals can be effectively separated, and the lead-zinc ore with a lead grade of 1.07% and a zinc grade of 3.94% can be processed to obtain a lead concentrate with a lead grade of 45.26% and a lead recovery rate of 88.35%. ore and zinc concentrate with a zinc grade of 48.49% and a zinc recovery rate of 89.63%.

Example 3

The flotation method of a kind of lead-low-zinc high-type refractory lead-zinc ore provided by the present embodiment comprises the following steps:

(1) Grind the lead-zinc ore with a lead grade of 1.73% and a zinc grade of 6.28% until the particle size is -0.074mm, accounting for 75%, then add lime to adjust the pH value of the pulp to 11, and add potassium permanganate to adjust the pulp potential to 340mv , and then add 25g/t of ethyl disulfide nitrogen and 5g/t of terpineol oil to carry out priority flotation of lead minerals. The flotation process includes 1 roughing, 3 times of beneficiation, and 2 times of sweeping;

(2) carry out dehydration treatment respectively to the lead concentrate that lead mineral priority flotation obtains and lead mineral priority flotation tailings, merge the waste water that two kinds of products remove, and it is reused in lead mineral priority flotation process;

(3) Add lime to the tailings of lead mineral priority flotation to adjust the pH value of the slurry to 11, the dosage of copper sulfate is 30g/t, the dosage of ethyl disulfide nitrogen is 60g/t, and the dosage of terpineol oil is 15g/t. Flotation, the flotation process includes 1 roughing, 3 fine selections, and 2 sweeping processes;

(6) The zinc concentrate and zinc mineral flotation tailings obtained by zinc mineral flotation are dehydrated separately, and the wastewater removed by the two products is combined and reused in the zinc mineral flotation process.

Using the above-mentioned process and chemical conditions to test, the results show that the lead-zinc minerals can be effectively separated, and the lead-zinc ore with a lead grade of 1.73% and a zinc grade of 6.28% can be processed to obtain a lead concentrate with a lead grade of 50.67% and a lead recovery rate of 92.84%. ore and zinc concentrate with a zinc grade of 55.17% and a zinc recovery rate of 90.13%.

Comparative example 1

A kind of flotation separation process of lead-zinc ore provided by this comparative example, it may further comprise the steps:

(1) Grind the lead-zinc ore with a lead grade of 1.73% and a zinc grade of 6.28% until the particle size is -0.074mm, accounting for 75%, and then use lime to adjust the pH value of the slurry to 11, the dosage of zinc sulfate is 450g/t, and the dosage of sodium sulfite 225g/t, 25g/t ethyl disulfide nitrogen, 5g/t terpineol oil, 1 roughing, 3 beneficiating, and 2 sweeping processes for the priority flotation of lead minerals;

(4) Dehydration is carried out to the concentrate of lead mineral priority flotation, and the waste water removed is reused in the lead mineral priority flotation process;

(5) Use lime to adjust the pH value of the pulp to 11, use copper sulfate to 30g/t, ethionyl nitrogen to 60g/t, and pinitol oil to 15g/t to carry out zinc mineral flotation for the tailings of lead minerals preferential flotation. The process of selection is 1 rough selection, 3 selections, and 2 sweeps;

(6) The concentrate and tailings of zinc mineral flotation are dehydrated, and the removed wastewater is reused in the zinc mineral flotation process.

Experiments were carried out using the above process and chemical conditions, and the results showed that lead-zinc minerals can be effectively separated, and the lead-zinc ore with a lead grade of 1.73% and a zinc grade of 6.28% can be processed to obtain a lead concentrate with a lead grade of 38.67% and a lead recovery rate of 79.28%. ore and zinc concentrate with a zinc grade of 37.55% and a zinc recovery rate of 70.37%.

In summary, the flotation method of lead-low-zinc and high-type refractory lead-zinc ore in the embodiment of the present invention uses potassium permanganate as a potential regulator, and adjusts the slurry to a high potential and a high pH value through the pH regulator. environment, lead-zinc flotation separation is easy, lead-zinc flotation separation can be realized without adding inhibitors, and high-grade lead concentrate and zinc concentrate can be obtained under the dosage of chemicals, especially when the dosage of active agent is small. Mine has broad market application prospects.

The embodiments described above are some, not all, embodiments of the present invention. The detailed description of the embodiments of the invention is not intended to limit the scope of the claimed invention but to represent only selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Claims (7)

1. a kind of flotation method of lead-low-zinc high-type refractory lead-zinc ore, is characterized in that, comprises the following steps: S1, Priority flotation of lead minerals: After grinding the lead-zinc ore, add pH regulator, potential regulator, collector and foaming agent to carry out preferential flotation of lead minerals to obtain lead concentrate and lead minerals priority flotation Tailings selection, wherein the potential regulator is potassium permanganate, the potential regulator adjusts the potential of the flotation pulp to 210-350mv, and the pH regulator adjusts the pH value of the flotation pulp to 9 ~11; S2, dehydration: the lead concentrate and the lead mineral preferential flotation tailings are dehydrated respectively, and combined to obtain the first wastewater, and the first wastewater is reused in the lead mineral preferential flotation process in step S1 ; S3, zinc mineral flotation: adding pH adjuster, activator, collector, and foaming agent to the lead mineral priority flotation tailings to carry out zinc mineral flotation to obtain zinc concentrate and zinc mineral flotation tailings ; S4, dehydration: the zinc concentrate and the zinc mineral flotation tailings are dehydrated respectively, and combined to obtain a second wastewater, which is reused in the zinc mineral flotation process in step S3. 2. the flotation method of lead-low-zinc high-type refractory lead-zinc ore according to claim 1, is characterized in that, in step S1, described pH adjusting agent is lime, and described collector is ethyl disulfide, The foaming agent is selected from one or more of pine alcohol oil, No. 2 oil, methyl amyl alcohol, and butyl ether oil. 3. The flotation method of the lead-low-zinc high-type refractory lead-zinc ore according to claim 2, characterized in that, in step S1, in the priority flotation process of lead minerals, the consumption of the collector is 10～ 50g/t, the dosage of the foaming agent is 1-10g/t. 4. The flotation method of the lead-low-zinc high-type refractory lead-zinc ore according to claim 1, characterized in that, in the lead mineral priority flotation process, it includes 1 roughing, 2 to 4 times of beneficiation, 1 ~2 times of scanning process. 5. the flotation method of lead-low-zinc high-type refractory lead-zinc ore according to claim 1, is characterized in that, in step S3, described pH adjusting agent is lime, and described activator is copper sulfate, and described The collector is one or a mixture of ethiazide and butyl xanthate, and the foaming agent is selected from one or more of pine alcohol oil, No. 2 oil, methyl amyl alcohol, and butyl ether oil. 6. The method for flotation of lead-low-zinc and high-type refractory lead-zinc ore according to claim 5, characterized in that, in step S3, the pH regulator adjusts the slurry to a pH value of 9-11, and the The dosage of the activator is 10-60g/t, the dosage of the collector is 20-80g/t, and the dosage of the foaming agent is 5-20g/t. 7. The flotation method of the lead-low-zinc high-type refractory lead-zinc ore according to claim 1, characterized in that, in the zinc mineral flotation process, it comprises 1 roughing, 2 to 4 refinements, 1 to 4 2 sweeps.