阅读说明：本技术 一种高钙镁高泥质混合铅锌矿浮选回收方法 (Flotation recovery method for high-calcium-magnesium high-argillaceous mixed lead-zinc ore ) 是由 祁忠旭 尹贤刚 冯程 孙大勇 韩远燕 王龙 肖舜元 李�杰 翟旭东 李昭旺 王硕 于 2020-12-15 设计创作，主要内容包括：本发明提供了一种高钙镁高泥质混合铅锌矿浮选回收方法,通过向原矿中加入少量的石灰进行湿磨,得到矿浆；再依次进行硫化铅浮选、硫化锌浮选、脱硫浮选和氧化锌浮选,实现对混合铅锌矿的浮选回收。通过上述方式,本发明采用了硫化铅锌低碱浮选和氧化锌捕收剂不脱泥全粒级浮选技术,实现了对混合铅锌矿的高效浮选回收,并大幅度提高铅锌的回收率,进一步提高了资源利用率；同时,本发明能够有效解决现有的高碱工艺和氧化锌脱泥后浮选工艺存在的问题,使整体浮选过程绿色环保、稳定高效,具有良好的技术经济指标,能够满足实际应用的需求,具有较高的应用价值。(The invention provides a flotation recovery method of high-calcium-magnesium high-argillaceous mixed lead-zinc ore, which comprises the steps of adding a small amount of lime into raw ore to carry out wet grinding to obtain ore pulp; and then sequentially carrying out lead sulfide flotation, zinc sulfide flotation, desulfurization flotation and zinc oxide flotation to realize flotation recovery of the mixed lead-zinc ore. By adopting the mode, the invention adopts the low-alkali flotation of lead and zinc sulfide and the slime-free full-size flotation technology of the zinc oxide collector, realizes the high-efficiency flotation and recovery of the mixed lead and zinc ore, greatly improves the recovery rate of lead and zinc, and further improves the resource utilization rate; meanwhile, the method can effectively solve the problems of the existing high-alkali process and the flotation process after desliming of zinc oxide, so that the whole flotation process is environment-friendly, stable and efficient, has good technical and economic indexes, can meet the requirements of practical application, and has higher application value.)

1. A flotation recovery method for high-calcium-magnesium high-argillaceous mixed lead-zinc ore is characterized by comprising the following steps:

s1, crushing the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore, and adding 500-1000 g/t lime for wet grinding to obtain ore pulp;

s2, adding a first preset reagent into the ore pulp obtained in the step S1 to perform lead sulfide flotation, and obtaining lead sulfide concentrate and first roughing tailings;

s3, adding a second preset reagent into the first roughing tailings obtained in the step S2 to perform zinc sulfide flotation to obtain zinc sulfide concentrate and second roughing tailings;

s4, adding a third preset reagent into the second roughed tailings obtained in the step S3 for desulfurization flotation to obtain sulfur rough concentrates and third roughed tailings;

s5, adding a fourth preset reagent into the third rougher tailings obtained in the step S4 for zinc oxide flotation to obtain zinc oxide concentrate and fourth rougher tailings;

s6, combining the sulfur rough concentrate obtained in the step S4 and the fourth rough tailings obtained in the step S5 to obtain final tailings.

2. The flotation recovery method for the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore according to claim 1, characterized by comprising the following steps: in step S2, the zinc sulfide flotation adopts a process of one roughing, two scavenging and three concentrating.

3. The flotation recovery method for the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore according to claim 2, characterized by comprising the following steps: in step S2, the first preset medicament includes: 500-700 g/t of sodium sulfide, 200-300 g/t of zinc sulfate, 200-300 g/t of sodium sulfite, 60-80 g/t of ethidium nitrate, 10-15 g/t of black powder and 10-20 g/t of No. 2 oil as roughing agents; 20-30 g/t of ethidium and nitrogen as a first scavenging medicament; 10-20 g/t of ethidium and nitrogen as a second scavenging medicament; 100-150 g/t of zinc sulfate and 100-150 g/t of sodium sulfite which are used as first concentration reagents; 50-100 g/t of zinc sulfate and 50-100 g/t of sodium sulfite are used as secondary concentration reagents.

4. The flotation recovery method for the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore according to claim 1, characterized by comprising the following steps: in step S5, the zinc oxide flotation adopts a process of one roughing, one scavenging and two concentrating.

5. The method for flotation recovery of high-calcium high-magnesium high-argillaceous mixed lead-zinc ore according to claim 4, characterized in that: in step S5, the fourth preset medicament includes: 800-1000 g/t of sodium hexametaphosphate, 80-100 g/t of carboxymethyl cellulose, 3000-4000 g/t of sodium sulfide, 30-50 g/t of miscible collecting agent and 50-60 g/t of butyl xanthate which are used as crude dressing agents; 500-1000 g/t of sodium sulfide, 10-20 g/t of the miscible collecting agent and 20-30 g/t of butyl xanthate as scavenging agents; 200-300 g/t of sodium hexametaphosphate as a first concentration medicament.

6. The method for recovering the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore by flotation according to any one of claims 1 to 5, characterized by comprising the following steps: in step S5, the miscible collector includes 2% to 5% of palmityl amine, 2% to 5% of acetic acid, 45% to 50% of water, 10% to 15% of hydroxyethyl cellulose, and 30% to 35% of polyacrylic acid.

7. The flotation recovery method for the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore according to claim 1, characterized by comprising the following steps: in step S3, the zinc sulfide flotation adopts a process of one roughing, two scavenging and three concentrating.

8. The flotation recovery method for the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore according to claim 7, characterized by comprising the following steps: in step S3, the second preset medicament includes: 200-300 g/t of sodium hexametaphosphate, 450-550 g/t of copper sulfate, 80-100 g/t of butyl xanthate and 10-20 g/t of 2# oil as roughing agents; 20-30 g/t of butyl xanthate as a first scavenging medicament; 10-20 g/t of butyl xanthate as a second scavenging agent; 100-150 g/t of sodium hexametaphosphate as a first concentration medicament.

9. The method for flotation recovery of high-calcium high-magnesium high-argillaceous mixed lead-zinc ore according to claim 8, characterized in that: in step S4, the desulfurization flotation is primary roughing; the third preset medicament comprises 1000-2000 g/t of sodium carbonate, 80-100 g/t of butyl xanthate and 20-30 g/t of No. 2 oil.

10. The method for recovering the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore by flotation according to any one of claims 1 to 9, characterized by comprising the following steps: in step S1, the fineness of ore grinding in the wet grinding process is 80-85% of ore with the particle size of less than 0.074 mm; the concentration of the ore pulp is 30-40%.

Technical Field

The invention relates to the technical field of lead-zinc ore flotation, in particular to a flotation recovery method of high-calcium-magnesium high-argillaceous mixed lead-zinc ore.

Background

The high-calcium-magnesium high-argillaceous mixed lead-zinc ore generally has the following characteristics: 1) the calcareous magnesium gangue contains various minerals such as calcareous magnesium carbonate such as dolomite and calcite, and also contains magnesium silicate such as quartz, feldspar, amphibole, pyroxene, chlorite and mica; 2) the content of the calcium-magnesium gangue mineral is as high as 50 percent to 70 percent; 3) the argillization is severe and the ore contains a large amount of slime. The formation of the slime is caused by two reasons, namely, the primary slime is mainly argillaceous gangue minerals in the ore, such as chlorite, kaolinite, sericite, limonite, hematite and the like, and the content of the slime with the granularity less than 10 mu m is up to more than 20 percent; and secondary slime produced in the ore crushing and grinding processes, such as the brittle carbonate gangue like calcite and dolomite, is easy to over-grind and argillization in the crushing and grinding processes. Because the presence of slime has a serious adverse effect on the beneficiation of zinc oxide ores, a desliming treatment is generally required before the flotation of zinc oxide ores.

For high-calcium-magnesium high-argillaceous mixed lead-zinc ore, the existing ore dressing method generally adopts a high-alkali process of full-priority flotation, firstly, 6-7 kg/t of lime is added to preferentially float lead sulfide, then, zinc sulfide is floated on tailings, and zinc sulfide tailings are graded and deslimed and then are used for floating zinc oxide.

However, the conventional beneficiation technology for the high-calcium-magnesium high-argillaceous mixed lead-zinc ore has the following problems: 1) a large amount of lime is added in lead sulfide flotation, the whole flotation process is carried out in a high-alkalinity environment with the pH value of about 11, and the subsequent zinc oxide flotation needs an environment with the pH value of about 9-10, so that 1-2 kg/t of ammonium bicarbonate is added before zinc oxide flotation to adjust the pH value, the ammonia content in a plant is high, and the working environment is severe; 2) because a large amount of lime is added, zinc sulfide is inhibited, a large amount of copper sulfate is needed for activation in zinc sulfide flotation operation, the copper sulfate usage amount is up to 800-1000 g/t, and the medicament cost is high; 3) the on-site process of zinc oxide flotation adopts a process flow of desliming and then refloating, so that nearly 50% of zinc metal is removed, and the recovery rate of zinc oxide is low; 4) the zinc oxide generally adopts fatty acid or amine collecting agents, and the collecting agents have large foam quantity, so that flotation foam is rich and has high viscosity, defoaming is difficult, and the flotation process is unstable; 5) the pH value of the mineral separation backwater is as high as 11, and the recycling is difficult.

In view of the above, there is a need to design an improved flotation recovery method for high-calcium-magnesium high-argillaceous mixed lead-zinc ore to solve the above problems.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a flotation recovery method for high-calcium-magnesium high-argillaceous mixed lead-zinc ore. The high-efficiency flotation recovery of the mixed lead-zinc ore is realized by adopting the lead-zinc sulfide low-alkali flotation and zinc oxide desliming-free full-size flotation technology, the recovery rate of lead and zinc is greatly improved, and the resource utilization rate is improved; and the problems of the high-alkali process and the flotation process after the desliming of the zinc oxide are solved, so that the whole flotation process is environment-friendly, stable and efficient, and has good technical and economic indexes.

In order to realize the aim, the invention provides a flotation recovery method of high-calcium-magnesium high-argillaceous mixed lead-zinc ore, which comprises the following steps:

s1, crushing the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore, and adding 500-1000 g/t lime for wet grinding to obtain ore pulp;

s2, adding a first preset reagent into the ore pulp obtained in the step S1 to perform lead sulfide flotation, and obtaining lead sulfide concentrate and first roughing tailings;

s3, adding a second preset reagent into the first roughing tailings obtained in the step S2 to perform zinc sulfide flotation to obtain zinc sulfide concentrate and second roughing tailings;

s4, adding a third preset reagent into the second roughed tailings obtained in the step S3 for desulfurization flotation to obtain sulfur rough concentrates and third roughed tailings;

s5, adding a fourth preset reagent into the third rougher tailings obtained in the step S4 for zinc oxide flotation to obtain zinc oxide concentrate and fourth rougher tailings;

s6, combining the sulfur rough concentrate obtained in the step S4 and the fourth rough tailings obtained in the step S5 to obtain final tailings.

As a further improvement of the invention, in step S2, the zinc sulfide flotation adopts a process of one roughing, two scavenging and three concentrating.

As a further improvement of the present invention, in step S2, the first preset medicine includes: 500-700 g/t of sodium sulfide, 200-300 g/t of zinc sulfate, 200-300 g/t of sodium sulfite, 60-80 g/t of ethidium nitrate, 10-15 g/t of black powder and 10-20 g/t of No. 2 oil as roughing agents; 20-30 g/t of ethidium and nitrogen as a first scavenging medicament; 10-20 g/t of ethidium and nitrogen as a second scavenging medicament; 100-150 g/t of zinc sulfate and 100-150 g/t of sodium sulfite which are used as first concentration reagents; 50-100 g/t of zinc sulfate and 50-100 g/t of sodium sulfite are used as secondary concentration reagents.

As a further improvement of the invention, in step S5, the zinc oxide flotation adopts a process of once roughing, once scavenging and twice concentrating.

As a further improvement of the present invention, in step S5, the fourth preset medicine includes: 800-1000 g/t of sodium hexametaphosphate, 80-100 g/t of carboxymethyl cellulose, 3000-4000 g/t of sodium sulfide, 30-50 g/t of miscible collecting agent and 50-60 g/t of butyl xanthate which are used as crude dressing agents; 500-1000 g/t of sodium sulfide, 10-20 g/t of the miscible collecting agent and 20-30 g/t of butyl xanthate as scavenging agents; 200-300 g/t of sodium hexametaphosphate as a first concentration medicament.

As a further improvement of the invention, in step S5, the miscible collector includes 2% to 5% of palmityl amine, 2% to 5% of acetic acid, 45% to 50% of water, 10% to 15% of hydroxyethyl cellulose, and 30% to 35% of polyacrylic acid.

As a further improvement of the invention, in step S3, the zinc sulfide flotation adopts a process of one roughing, two scavenging and three concentrating.

As a further improvement of the present invention, in step S3, the second preset medicine includes: 200-300 g/t of sodium hexametaphosphate, 450-550 g/t of copper sulfate, 80-100 g/t of butyl xanthate and 10-20 g/t of 2# oil as roughing agents; 20-30 g/t of butyl xanthate as a first scavenging medicament; 10-20 g/t of butyl xanthate as a second scavenging agent; 100-150 g/t of sodium hexametaphosphate as a first concentration medicament.

As a further improvement of the invention, in step S4, the desulfurization flotation is primary roughing; the third preset medicament comprises 1000-2000 g/t of sodium carbonate, 80-100 g/t of butyl xanthate and 20-30 g/t of No. 2 oil.

As a further improvement of the invention, in step S1, the ore fineness of the wet grinding process is 80-85% of the ore with the particle size less than 0.074 mm; the concentration of the ore pulp is 30-40%.

The invention has the beneficial effects that:

(1) the flotation recovery method for the high-calcium-magnesium high-argillaceous mixed lead-zinc ore provided by the invention adopts low-alkali flotation of lead-zinc sulfide and non-desliming full-size flotation technology of a zinc oxide collector, can solve the problems of high pollution, serious scaling of lime pipelines, difficult recycling of tailing water and the like in the traditional high-alkali process, can also solve the problem of low zinc oxide recovery rate caused by desliming in the traditional zinc oxide flotation process, and improves the stability of the flotation process. Based on effective improvement of the prior art, the method can realize high-efficiency flotation recovery of the mixed lead-zinc ore, greatly improve the recovery rate and the resource utilization rate of lead and zinc, ensure that the whole flotation process is green, environment-friendly, stable and high-efficiency, has good technical and economic indexes, and can meet the requirements of practical application.

(2) According to the invention, by adopting a low-alkali flotation technology and utilizing the combined inhibition of sodium sulfide, zinc sulfate and sodium sulfite, a more efficient zinc sulfide inhibition effect is realized, the problems caused by the adoption of a high-alkali process to inhibit zinc sulfide in the prior art are avoided, the use amount of lime can be reduced by 90%, the use amount of copper sulfate can be reduced by 45%, and ammonium bicarbonate is not required. The whole flotation process not only effectively saves the medicament cost, but also can avoid the influence of ammonium bicarbonate on the production environment, and the pH value of return water is reduced from 11 to 7, thereby creating conditions for the utilization of the return water, enabling the waste water to be completely recycled, reducing the discharge pressure and the pollution to the environment, and achieving the effects of energy conservation and environmental protection.

(3) According to the invention, the miscible collecting agent with weak foamability is adopted in the zinc oxide flotation process, so that the foam viscosity can be effectively reduced, and the adaptability to slime is improved; meanwhile, the sodium hexametaphosphate and the carboxymethyl cellulose are used, so that the influence of slime, carbonate and silicate gangue on flotation is further eliminated, the non-slime-removal full-size flotation of the zinc oxide is realized, the purpose of intensified collection is achieved, the loss of fine-size zinc oxide is effectively avoided, and the comprehensive recovery rate of the zinc oxide is obviously improved. In addition, the combined collecting agent of the ethyl sulfur nitrogen and the black powder with better selectivity on the galena is used in the lead sulfide flotation process, so that the lead flotation efficiency can be effectively improved, the lead recovery rate is improved, and the practical application value is higher.

Drawings

FIG. 1 is a schematic flow chart of the flotation recovery method of the high-calcium-magnesium high-argillaceous mixed lead-zinc ore provided by the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.

In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The invention provides a flotation recovery method of high-calcium-magnesium high-argillaceous mixed lead-zinc ore, which comprises the following steps:

s1, crushing the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore, and adding 500-1000 g/t lime for wet grinding to obtain ore pulp;

s2, adding a first preset reagent into the ore pulp obtained in the step S1 to perform lead sulfide flotation, and obtaining lead sulfide concentrate and first roughing tailings;

s3, adding a second preset reagent into the first roughing tailings obtained in the step S2 to perform zinc sulfide flotation to obtain zinc sulfide concentrate and second roughing tailings;

s4, adding a third preset reagent into the second roughed tailings obtained in the step S3 for desulfurization flotation to obtain sulfur rough concentrates and third roughed tailings;

s5, adding a fourth preset reagent into the third rougher tailings obtained in the step S4 for zinc oxide flotation to obtain zinc oxide concentrate and fourth rougher tailings;

s6, combining the sulfur rough concentrate obtained in the step S4 and the fourth rough tailings obtained in the step S5 to obtain final tailings.

In step S1, the fineness of ore grinding in the wet grinding process is 80-85% of ore with the particle size of less than 0.074 mm; the concentration of the ore pulp is 30-40%.

In step S2, the zinc sulfide flotation adopts a process of one roughing, two scavenging and three concentrating. The first pre-set medicament comprises: 500-700 g/t of sodium sulfide, 200-300 g/t of zinc sulfate, 200-300 g/t of sodium sulfite, 60-80 g/t of ethidium nitrate, 10-15 g/t of black powder and 10-20 g/t of No. 2 oil as roughing agents; 20-30 g/t of ethidium and nitrogen as a first scavenging medicament; 10-20 g/t of ethidium and nitrogen as a second scavenging medicament; 100-150 g/t of zinc sulfate and 100-150 g/t of sodium sulfite which are used as first concentration reagents; 50-100 g/t of zinc sulfate and 50-100 g/t of sodium sulfite are used as secondary concentration reagents.

In step S3, the zinc sulfide flotation adopts a process of one roughing, two scavenging and three concentrating. The second pre-set medicament comprises: 200-300 g/t of sodium hexametaphosphate, 450-550 g/t of copper sulfate, 80-100 g/t of butyl xanthate and 10-20 g/t of 2# oil as roughing agents; 20-30 g/t of butyl xanthate as a first scavenging medicament; 10-20 g/t of butyl xanthate as a second scavenging agent; 100-150 g/t of sodium hexametaphosphate as a first concentration medicament.

In step S4, the desulfurization flotation is primary roughing; the third preset medicament comprises 1000-2000 g/t of sodium carbonate, 80-100 g/t of butyl xanthate and 20-30 g/t of No. 2 oil.

In step S5, the zinc oxide flotation adopts a process of one roughing, one scavenging and two concentrating. The fourth pre-set medicant comprises: 800-1000 g/t of sodium hexametaphosphate, 80-100 g/t of carboxymethyl cellulose, 3000-4000 g/t of sodium sulfide, 30-50 g/t of miscible collecting agent and 50-60 g/t of butyl xanthate which are used as crude dressing agents; 500-1000 g/t of sodium sulfide, 10-20 g/t of the miscible collecting agent and 20-30 g/t of butyl xanthate as scavenging agents; 200-300 g/t of sodium hexametaphosphate as a first concentration medicament. The miscible collector comprises 2-5% of palmityl amine, 2-5% of acetic acid, 45-50% of water, 10-15% of hydroxyethyl cellulose and 30-35% of polyacrylic acid.

The flotation recovery method of the high calcium magnesium argillaceous mixed lead-zinc ore provided by the invention is explained by combining with specific examples.

Example 1

The embodiment provides a flotation recovery method of high-calcium-magnesium high-argillaceous mixed lead-zinc ore, which comprises the following steps:

s1, crushing the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore, adding 750g/t of lime into the ore grinding process according to each ton of raw ore to perform wet grinding so as to enable the mass percentage of the ore with the particle size of less than 0.074mm to be 80% -85%, and adding water to adjust the concentration of ore pulp to 35%.

S2, performing lead sulfide flotation on the ore pulp obtained in the step S1 by adopting the processes of primary roughing, secondary scavenging and tertiary concentration to obtain lead sulfide concentrate and primary roughing tailings; wherein, the roughing agents are 600g/t of sodium sulfide, 250g/t of zinc sulfate, 250g/t of sodium sulfite, 70g/t of ethyl-sulfur-nitrogen, 13g/t of black powder and 15g/t of No. 2 oil; the medicament for the first scavenging is 25g/t of ethidium and nitrogen; the reagent for the second scavenging is 15g/t of ethidium and nitrogen; the first concentration agents are 130g/t of zinc sulfate and 130g/t of sodium sulfite; the agents for the second concentration are 75g/t of zinc sulfate and 75g/t of sodium sulfite; no medicament is added in the third selection.

S3, performing zinc sulfide flotation on the first roughed tailings obtained in the step S2 by adopting the processes of primary rougher flotation, secondary scavenging and tertiary cleaner flotation to obtain zinc sulfide concentrate and secondary roughed tailings; wherein, the crude selected medicaments are 250g/t of sodium hexametaphosphate, 500g/t of copper sulfate, 90g/t of butyl xanthate and 15g/t of No. 2 oil; the medicament for the first scavenging is 25g/t of butyl xanthate; the medicament for the second scavenging is butyl xanthate 15 g/t; the first concentration agent is 125g/t sodium hexametaphosphate; no medicament is added in the second concentration and the third concentration.

S4, carrying out desulfurization flotation on the second roughed tailings obtained in the step S3 by adopting a primary rougher flotation process to obtain sulfur rough concentrates and third roughed tailings; wherein, the crude medicament is 1500g/t of sodium carbonate, 90g/t of butyl xanthate and 25g/t of 2# oil.

S5, performing zinc oxide flotation on the third roughed tailings obtained in the step S4 by adopting the processes of primary rougher flotation, primary scavenging and secondary fine flotation to obtain zinc oxide concentrate and fourth roughed tailings; wherein the crude selection medicaments comprise 900g/t of sodium hexametaphosphate, 90g/t of carboxymethyl cellulose, 3500g/t of sodium sulfide, 40g/t of miscible collecting agent and 55g/t of butyl xanthate; the scavenging agent comprises 750g/t of sodium sulfide, 15g/t of the miscible collector and 25g/t of butyl xanthate; the first concentration of the medicament is 250g/t of sodium hexametaphosphate; no medicament is added in the second selection. Wherein the miscible collector consists of 2.5% of palmityl amine, 2.5% of acetic acid, 48% of water, 12.5% of hydroxyethyl cellulose and 32.5% of polyacrylic acid.

S6, combining the sulfur rough concentrate obtained in the step S4 and the fourth rough tailings obtained in the step S5 to obtain final tailings.

The contents of the respective elements and the raw ore oxidation rate of the high-calcium-magnesium high-argillaceous mixed lead-zinc ore used in this example are shown in table 1.

TABLE 1 contents of the elements in the high-Ca-Mg-content high-argillaceous lead-zinc ores and the oxidation rates of the raw ores

Pb(％)	Zn(％)	Ag(g/t)	Raw ore oxidation rate (%)
				1.36	8.50	80	21.37

Comparative example 1

Comparative example 1 provides a flotation recovery method of high calcium magnesium high argillaceous mixed lead-zinc ore based on a lead-zinc sulfide high-alkali flotation process and a zinc oxide desliming flotation process, which specifically comprises the following steps:

s1, carrying out wet grinding on the high-calcium high-magnesium high-argillaceous mixed lead-zinc ore, adding 4500g/t of lime into the ore grinding process according to the weight percentage of each ton of raw ore, wherein the grinding fineness is 80-85% calculated by the mass percentage of the ore granularity smaller than 0.074mm, and adding water to adjust the concentration of ore pulp to 35%.

S2, performing lead sulfide flotation on the ore pulp obtained in the step S1 by adopting the processes of primary roughing, secondary scavenging and tertiary concentration to obtain lead sulfide concentrate and primary roughing tailings; the roughing agents are 150g/t of zinc sulfate, 150g/t of sodium sulfite, 110g/t of ethyl sulfur nitrogen and 15g/t of No. 2 oil, the first scavenging agent is 25g/t of ethyl sulfur nitrogen, the second scavenging agent is 15g/t of ethyl sulfur nitrogen, no agent is added in the first concentration and the second concentration, and the third concentrating agent is 3000g/t of lime.

S3, performing zinc sulfide flotation on the first roughed tailings obtained in the step S2 by adopting the processes of primary rougher flotation, secondary scavenging and tertiary cleaner flotation to obtain zinc sulfide concentrate and secondary roughed tailings; wherein, the roughing agents are 900g/t of copper sulfate, 110g/t of butyl xanthate and 15g/t of No. 2 oil, the first scavenging agent is 25g/t of butyl xanthate, the second scavenging agent is 15g/t of butyl xanthate, and no agent is added in the third selection process.

S4, carrying out cyclone desliming on the tailings obtained in the secondary roughing to obtain cyclone overflow products and settled sand products; adding a medicament into the settled sand product for desulfurization flotation to obtain sulfur rough concentrate and third rough concentration tailings, wherein the process comprises primary rough concentration, and the rough concentration medicament comprises 1500g/T of ammonium bicarbonate, 90g/T of butyl xanthate and 25g/T of T-298.

S5, performing zinc oxide flotation on the third roughed tailings obtained in the step S4 by adopting the processes of one roughing, one scavenging and two concentrating; wherein, the roughing medicaments are 1250g/t of water glass, 3500g/t of sodium sulfide, 40g/t of collecting agent E-5 and 55g/t of butyl xanthate, the first scavenging medicaments are 750g/t of sodium sulfide, 15g/t of collecting agent E-5 and 25g/t of butyl xanthate, and no medicament is added in the two concentration processes.

And S6, combining the overflow product of the cyclone, the sulfur rough concentrate subjected to desulfurization and flotation and the fourth rough tailings to obtain final tailings.

Comparative example 1 the raw ore used was the same as in example 1, and the results of flotation of the high-calcium magnesium argillaceous mixed lead-zinc ore according to the flotation recovery methods provided in comparative example 1 and example 1 are shown in table 2.

TABLE 2 beneficiation test results of high calcium magnesium argillaceous lead-zinc ores

As can be seen from table 2, compared with the lead-zinc sulfide high-alkali flotation and zinc oxide desliming flotation processes commonly used in the prior art, the low-alkali flotation process and the zinc oxide desliming full-size flotation process adopted in example 1 not only eliminate the use of ammonium bicarbonate which is an irritant odor, significantly improve the working environment of a site, but also greatly reduce the production cost, and significantly increase the recovery rates of the obtained lead sulfide concentrate, zinc oxide concentrate and Ag, which indicates that the method provided in example 1 can perform efficient flotation recovery on the mixed lead-zinc ore, and significantly improve the recovery rate of lead and zinc and the resource utilization rate.

Examples 2 to 3 and comparative examples 2 to 3

Examples 2 to 3 and comparative examples 2 to 3 each provide a method for flotation recovery of a high-calcium-magnesium high-argillaceous mixed lead-zinc ore, which is different from example 1 in that the addition amount of lime is adjusted. Wherein the addition amounts of lime in examples 2 to 3 and comparative examples 1 to 2 were 500g/t, 1000g/t, 4000g/t and 5000g/t, respectively.

The results of flotation of the high-calcium magnesium argillaceous mixed lead-zinc ores were as shown in table 3, according to the methods provided in examples 2 to 3 and comparative examples 2 to 3, respectively.

TABLE 3 results of beneficiation test in examples 2 to 3 and comparative examples 2 to 3

As can be seen from table 3, under the same mineral sample conditions, the low-alkali flotation process for lead zinc sulfide used in examples 2 to 3 effectively reduces the amount of lime, significantly improves the recovery rate of lead, zinc and silver, greatly reduces the production cost, and realizes efficient recycling of resources, compared with the high-alkali flotation process for lead zinc sulfide used in comparative examples 2 to 3.

Examples 4 to 5

Embodiments 4 to 5 respectively provide a method for flotation recovery of high-calcium-magnesium high-argillaceous mixed lead-zinc ore, which is different from embodiment 1 in that the medicament content in each step is adjusted, and the remaining steps are the same as those in embodiment 1, and are not described herein again.

In example 4, the crude selection agents in the step S2 are 500g/t of sodium sulfide, 200g/t of zinc sulfate, 200g/t of sodium sulfite, 60g/t of ethidium nitrate, 10g/t of black powder and 10g/t of No. 2 oil; the first scavenging agent is 20g/t of ethidium and nitrogen; the second scavenging agent is ethidium nitrate 10 g/t; the first concentration medicament is 100g/t zinc sulfate and 100g/t sodium sulfite; the second concentration agent is 50g/t zinc sulfate and 50g/t sodium sulfite. In the step S3, the crude selection medicaments comprise 200g/t of sodium hexametaphosphate, 450g/t of copper sulfate, 80g/t of butyl xanthate and 10g/t of 2# oil; the first scavenging medicament is 20g/t of butyl xanthate; the second scavenging agent is 10g/t of butyl xanthate; the first concentration agent is 100g/t sodium hexametaphosphate. In the step S4, the crude drugs are 1000g/t of sodium carbonate, 80g/t of butyl xanthate and 20g/t of 2# oil. In the step S5, the roughing medicaments comprise 800g/t of sodium hexametaphosphate, 80g/t of carboxymethyl cellulose, 3000g/t of sodium sulfide, 30g/t of miscible collecting agent and 50g/t of butyl xanthate; the scavenging agent is 500g/t of sodium sulfide, 10g/t of miscible collecting agent and 20g/t of butyl xanthate; the first concentration agent is 200g/t of sodium hexametaphosphate.

In example 5, the crude selection agents in the step S2 are 700g/t of sodium sulfide, 300g/t of zinc sulfate, 300g/t of sodium sulfite, 80g/t of ethidium nitrate, 15g/t of black powder and 20g/t of No. 2 oil; the first scavenging agent is 30g/t of ethidium and nitrogen; the second scavenging agent is 20g/t of ethidium and nitrogen; the first concentration medicament is zinc sulfate 150g/t and sodium sulfite 150 g/t; the second concentration agent is zinc sulfate 100g/t and sodium sulfite 100 g/t. In the step S3, the crude selection medicaments comprise 300g/t of sodium hexametaphosphate, 550g/t of copper sulfate, 100g/t of butyl xanthate and 20g/t of 2# oil; the first scavenging medicament is 30g/t of butyl xanthate; the second scavenging agent is 20g/t of butyl xanthate; the first concentration agent is 150g/t of sodium hexametaphosphate. In the step S4, the crude drugs are 2000g/t of sodium carbonate, 100g/t of butyl xanthate and 30g/t of 2# oil. In the step S5, the roughing medicament is 1000g/t of sodium hexametaphosphate, 100g/t of carboxymethyl cellulose, 4000g/t of sodium sulfide, 50g/t of miscible collecting agent and 60g/t of butyl xanthate; the scavenging agent is 1000g/t of sodium sulfide, 20g/t of miscible collecting agent and 30g/t of butyl xanthate; the first concentration agent is 300g/t sodium hexametaphosphate.

The results of flotation of the high-calcium magnesium argillaceous mixed lead-zinc ores were as shown in table 4, according to the methods provided in examples 4 to 5.

TABLE 4 results of beneficiation test in examples 4 to 5

As can be seen from Table 4, the method provided by the invention can achieve higher recovery rate after the dosage of each agent is properly adjusted, and shows that the method provided by the invention is suitable for high-calcium-magnesium, high-argillaceous, sulfurized and oxidized mixed lead-zinc ores. The invention adopts the lead-zinc sulfide ore low-alkali process and the zinc oxide full-grain flotation process, thereby not only being green and environment-friendly, but also having little pollution and stable flotation process; the method can also greatly reduce the using amount of lime and copper sulfate, cancel ammonium bicarbonate, reduce the pH value of return water from 11 to 7, simultaneously has higher lead-zinc recovery rate, advanced technical and economic indexes and can efficiently utilize resources.

In conclusion, the invention provides a flotation recovery method of high-calcium-magnesium high-argillaceous mixed lead-zinc ore, which comprises the steps of adding a small amount of lime into raw ore to carry out wet grinding to obtain ore pulp; and then sequentially carrying out lead sulfide flotation, zinc sulfide flotation, desulfurization flotation and zinc oxide flotation to realize flotation recovery of the mixed lead-zinc ore. By adopting the mode, the invention adopts the low-alkali flotation of lead and zinc sulfide and the slime-free full-size flotation technology of the zinc oxide collector, realizes the high-efficiency flotation and recovery of the mixed lead and zinc ore, greatly improves the recovery rate of lead and zinc, and further improves the resource utilization rate; meanwhile, the method can effectively solve the problems of the existing high-alkali process and the flotation process after desliming of zinc oxide, so that the whole flotation process is environment-friendly, stable and efficient, has good technical and economic indexes, can meet the requirements of practical application, and has higher application value.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.