阅读说明：本技术 一种中矿再磨提高矿石选金回收率的方法 (Method for improving gold separation recovery rate of ore by regrinding middling ) 是由 姜绍军 田向盛 聂赵军 郭军锋 刘小锋 吴通林 于 2021-07-27 设计创作，主要内容包括：本发明公开了提供了一种中矿再磨提高矿石选金回收率的方法,目的是解决铅锌矿回收率低问题。所述提高铅锌矿回收率是指原矿结构复杂、粒度不均、氧化率高铅锌矿。通过阶段磨矿、分步快选和氧硫混选、联合给药等来回收矿物。在选铅中阶段磨矿、分步快选,既回收细粒铅,又减少粗粒铅循环量；将锌粗第一槽直接出产品,其它泡沫进入精2,原精1作为精选扫选既保证精矿品位又提高回收率；在扫选加入氧化药剂回收氧化矿。本发明提供了一整套铅锌矿浮选流程和药剂制度,可有效提高含泥高、高氧化、粒度粗细不均等铅锌矿金属回收率。(The invention discloses a method for improving the recovery rate of gold concentration of ores by regrinding middlings, and aims to solve the problem of low recovery rate of lead-zinc ores. The improvement of the recovery rate of the lead-zinc ore refers to the lead-zinc ore with complex structure, uneven granularity and high oxidation rate of the raw ore. The minerals are recovered by stage ore grinding, step-by-step fast separation, oxygen-sulfur mixed separation, combined administration and the like. In the lead separation, the stage grinding and the step-by-step quick separation are carried out, so that fine lead is recovered, and the circulating amount of coarse lead is reduced; directly discharging the product from the zinc coarse first tank, feeding other foams into a concentrate 2, and scavenging the original concentrate 1 as a fine concentrate to ensure the concentrate grade and improve the recovery rate; adding an oxidizing agent in the scavenging process to recover the oxidized ore. The invention provides a whole set of lead-zinc ore flotation flow and a medicament system, and can effectively improve the metal recovery rate of the lead-zinc ore with high mud content, high oxidation, uneven granularity and the like.)

1. A method for improving the gold separation recovery rate of ore by regrinding middlings is characterized in that a flotation process structure and a reagent system comprise:

(1) grinding raw ore to coarse embedded target mineral monomers through primary grinding;

(2) the coarse-grained embedded lead-zinc sulfide mineral which is already cleaved and has high floating speed is flexibly determined to directly discharge a concentrate product or enter a certain selection section of fine selection according to the grade and impurity-containing condition of a foam product of the coarse selection;

(3) sequentially feeding the lead-zinc sulfide ore with low floating speed and part of oxidized ore continuously growing with the sulfide ore into a fine selection process;

(4) recovering oxygen and sulfur mixed ores which are embedded with fine granularity and cannot be effectively floated and recovered by the traditional sulfide ore flotation reagent by a combined administration method (simultaneously adding the oxide ore and the sulfide ore flotation reagent according to the proportion);

(5) performing secondary grinding on the foam product obtained in the step (4), and then entering a fine selection process;

(6) and (4) dividing the two-stage grinding of the step (5) into an open circuit regrinding mode and a closed circuit regrinding mode according to the difference of target minerals of the raw ore fine particle embedded part among the particles.

2. The method for improving the gold concentration recovery rate of the ore by middling regrinding according to claim 1, wherein the lead rough first tank bath concentrate is directly fed into a slurry suction pipe of a lead concentrate 2 (or concentrate 3) flotation machine; other roughly selected foam products enter the fine selection 1; 1, grinding middlings again, and pertinently adopting an open-circuit or closed-circuit grinding process according to different mud contents of raw ores; and adding flotation reagents for oxidized ores and sulphide ores simultaneously during scavenging.

3. The method for improving the gold concentration recovery rate of ore by middling regrinding according to claim 1, characterized in that the product is directly discharged from a first zinc roughing tank; other 4-groove foam concentrates enter a pulp suction pipe of a flotation machine of concentration 2 or concentration 3 according to the change of the grade of the raw ore; and (3) simultaneously adding flotation reagents of sulfide ores and oxide ores in the scavenging process.

4. The method for improving the gold separation recovery rate of the ore by regrinding the middling according to claim 1, wherein the lead-zinc raw ore is the lead-zinc ore with complex structure, uneven embedded granularity, high raw ore grade, large mud content and high oxidation rate.

Technical Field

The invention belongs to the technical field of mining recovery, and particularly relates to a method for improving the gold separation recovery rate of ores by middling regrinding.

Background

According to statistics, the total recovery rate of mineral resources in China is only about 50%, the comprehensive utilization rate of the co (concomitant) mineral resources is less than 40%, and the total recovery rate of the mineral resources is 20-30% different from that of foreign countries. China is a developing country, has a large population, and people with a lot of important mineral resources and water resources have the quantity far lower than the average level of people in the world, so that the contradiction between supply and demand is prominent, the severe situation does not allow the mineral industry in China to continuously go on old roads which waste resources and deteriorate the environment, but a sustainable development road needs to be gone, the key is to improve the comprehensive utilization rate of the mineral resources and the water resources and reduce the damage of the mineral industry development to the ecological environment, and the sustainable development requirement of the national economy is also met.

After more than 60 years of construction and development, the lead and zinc industry in China has formed a relatively complete industrial system and has a material basis with a considerable scale. According to statistics, the lead-zinc concentrate yield in 2016 reaches 700 ten thousand tons, and the lead-zinc concentrate yield accounts for more than 40% of the total global yield. China has become the main producing and consuming countries of lead and zinc in the world. Meanwhile, the industry has outstanding performances in the aspects of technical progress, diversification of main industrial investment, implementation of 'going out' strategy of enterprises and the like, and in recent years, the demand of raw materials is increased dramatically due to over expansion of the capacity of lead and zinc smelting enterprises. China has changed from a lead and zinc raw material export-only country to an import-only country. Especially, the dependence of large-scale major smelting enterprises on foreign lead and zinc concentrates is higher and higher, and the shortage of lead and zinc raw materials becomes a bottleneck restricting the sustainable development of the lead and zinc industry in China.

From the consumption situation of China, the lead and zinc markets in China will have a situation of short supply and short demand in the coming years. With the continuous increase of the demand of nonferrous metals in China, the quantity of high-quality lead-zinc ores available for mining is less and less, and only mines with lean ores, oxidized ores and complex structure can be mined and recovered step by step. The traditional beneficiation method is difficult to treat and recover the raw ores, so that the resource waste is caused, and the raw ores are urgently required to be treated by adopting an optimized flow and a medicament system.

Disclosure of Invention

Aiming at the actual exploitation of the complex lead-zinc ore and the defects of the existing flotation technology, the invention mainly provides a method for improving the flotation recovery rate of the complex lead-zinc ore. The method mainly comprises the following steps:

(1) grinding raw ore to coarse embedded target mineral monomers through primary grinding;

(2) the coarse-grained embedded lead-zinc sulfide mineral which is already cleaved and has high floating speed is flexibly determined to directly discharge a concentrate product or enter a certain selection section of fine selection according to the grade and impurity-containing condition of a foam product of the coarse selection;

(3) sequentially feeding the lead-zinc sulfide ore with low floating speed and part of oxidized ore continuously growing with the sulfide ore into a fine selection process;

(4) recovering oxygen and sulfur mixed ores which are embedded with fine granularity and cannot be effectively floated and recovered by the traditional sulfide ore flotation reagent by a combined administration method (simultaneously adding the oxide ore and the sulfide ore flotation reagent according to the proportion);

(5) performing secondary grinding on the foam product obtained in the step (4), and then entering a fine selection process;

(6) and (4) dividing the two-stage grinding of the step (5) into an open circuit regrinding mode and a closed circuit regrinding mode according to the difference of target minerals of the raw ore fine particle embedded part among the particles.

Compared with the prior art, the method for improving the gold separation recovery rate of the ore by regrinding the middling has the following main advantages:

(1) ores with different particle sizes are embedded in the same ore, and are subjected to ore grinding twice, so that the ore grinding energy consumption can be reduced, and overgrinding and argillization can be prevented;

(2) the selection times of different foam products are determined according to the difference of the flotation speed, so that the recycling amount of middlings can be reduced, and the recovery rate is improved;

(3) by jointly adding an oxidized ore flotation reagent in scavenging, oxidized ore can be partially recovered, and sulphide ore and oxidized ore in lead-zinc raw ore with the oxidation rate of about 15 percent can be comprehensively recovered.

(4) The flotation method of the process can greatly improve the recovery rate of lead and zinc by 5-10 percent, and generates good economic benefit.

Drawings

FIG. 1 shows a conventional process flow.

FIG. 2 shows the process flow employed in the present invention.

Detailed Description

The invention has been implemented in lead-zinc-silver polymetallic ores of cooperative early-minor channel gold mine Limited company in Gansu province, and the specific examples are as follows.

Example 1:

lead-zinc-silver multi-metal ore of cooperative early-minor channel gold mine Limited company of Gansu province, the raw ore is ground to-200 meshes at one section and accounts for about 55%, after lead roughing under medium alkalinity condition is adopted and a sulfide ore dressing agent is added, the foam product of the first tank contains more than 40% of lead and about 15% of zinc, and the foam product is directly subjected to concentration 3; the foam products of the other three grooves of the roughing enter the flow path of the refining 1. Thus, the flotation concentrate grade of the lead sulfide ore is ensured, and the recovery rate is improved.

Example 2:

in the lead separation process of lead-zinc-silver polymetallic ores of cooperative early-minor channel gold mine Limited company in Gansu province, sulfide ores and efficient oxide ore collecting agents are added into a lead roughing tailing gate box (namely scavenging 1) at the same time, and the obtained scavenging 1 foam product enters a fine separation 1 process after being reground; and (3) scavenging 2 and scavenging 3 are also added with sulfide ore and high-efficiency oxidized ore collecting agent, and then middling products are returned in sequence. In this way, both fine particles of lead sulphide and part of the lead oxide are recovered.

Example 3:

the regrinding procedure in example 2, according to the ore change: when the mud content in the foam product of the scavenging 1 is large, an open-circuit process is used for regrinding; otherwise, the regrinding uses a closed-loop process. Therefore, the problems of tank dropping in the fine concentration, low grade of concentrate products and the like when the mud content is high can be solved.

Example 4:

the mine of the cooperative early-minor channel gold mine Limited liability company of Gansu province is open-cast mining, the ore body is rich and poor, the zinc supplied ore level is high, the quality of the foam product of the first zinc roughing tank is the best, and the foam product is superior to the zinc concentrate and other foam products of the roughing tank produced by the fine concentration operation. And because the zinc mineral has coarse embedded granularity and high floating speed, the product sale quality can be achieved through 3 times of concentration (the concentration is designed to be 4 times), and the following reconstruction is carried out aiming at the above conditions: the first tank is roughly sorted by zinc to directly discharge a product; foam products of other roughing tanks enter a refining 2, and the original refining 1 is used as scavenging of the refining. By the method, the problems of capacity suppression of a zinc flotation process and tailing backward movement in the case that the grade of the zinc raw ore in the high-grade lead-zinc-silver ore is 8-14% are solved. On the premise of ensuring the concentrate grade, the recovery rate of zinc metal and the ore dressing treatment capacity are improved.

Example 5:

in the zinc separation process of lead-zinc-silver polymetallic ores of cooperative early-minor channel gold mine Limited company in Gansu province, sulfide ores and efficient oxide ore collectors are added simultaneously in zinc scavenging, and then middling products are returned sequentially. Thus, both zinc sulfide and zinc oxide are partially recovered.

Finally, the lead-zinc-silver polymetallic ore dressing plant of cooperative early-minor channel gold mine Limited company in Gansu province improves the recovery rate by about 10 percent after adopting the method.