CN-121972286-A - Ore dressing process for separating zinc concentrate

Abstract

The invention provides a beneficiation process for separating zinc concentrate, belongs to the technical field of mineral processing, and solves the problems of low roughing grade, high cyclic load, large medicament consumption and high tailing grade of the existing zinc concentrate separation process; adding a lead collecting agent, a zinc mineral inhibitor and a foaming agent into ore pulp through lead mineral preferential flotation, carrying out primary roughing and tertiary concentration to produce lead concentrate, simultaneously obtaining zinc-containing tailings, carrying out pre-concentration to produce first zinc concentrate with the grade of 53% -58%, carrying out roughing, scavenging and concentration on the pre-concentration tailings through a flotation machine to obtain second zinc concentrate with the grade of 47% -50%, and finally mixing the two concentrates according to the mass ratio to obtain the final zinc concentrate. The invention reduces the subsequent cyclic load by 40-50%, reduces the total medicament cost by 28-32%, controls the tailing zinc grade to be 0.04-0.11%, realizes the efficient separation of zinc concentrate, reduces the cost and controls the cooperation optimization of the tailing grade, and is suitable for the production scene of high-grade zinc concentrate.

Inventors

• XIAO YUN
• MA YONGPING
• ZHU YONGTAO
• LI QINGHENG
• WANG JIANHUI
• WANG ZEYU
• ZHANG WENQIAN
• HUANG YONG
• ZHANG LIANFENG
• ZHANG YONGYONG

Assignees

• 金徽矿业股份有限公司

Dates

Publication Date

20260505

Application Date

20260318

Claims (5)

1. 1. A beneficiation process for separating zinc concentrate, comprising the steps of: Step one, raw material pretreatment Crushing and grinding lead zinc ore raw ore until the fineness is-200 meshes with the proportion of 68% -78%, adding a pH regulator, adjusting the concentration of ore pulp to 25% -35%, and adjusting the pH value of ore pulp to 10.5-11.5; step two, lead mineral preferential floatation Adding a lead mineral collecting agent, a zinc mineral inhibitor and a foaming agent into the pretreated ore pulp with the pH value adjusted, wherein the adding amount of the lead mineral collecting agent is 80-100g/t of ore, the adding amount of the zinc mineral inhibitor is 300-500g/t of ore, and the adding amount of the foaming agent is 5-15g/t of ore; step three, pre-separation of jet flow microbubble flotation machine Conveying the zinc-containing tailing pulp obtained in the second step to a jet flow micro-bubble flotation machine, wherein the diameter of micro-bubbles generated by the jet flow micro-bubble flotation machine is 50-100 mu m, 300-550g/t of copper sulfate, 100-120g/t of xanthate and 5-15g/t of No. 2 oil are added, and flotation is carried out for 7-9min to obtain first zinc concentrate with the grade of 53-58%; step four, subsequent separation of conventional flotation machine The tailings obtained in the third step are conveyed to a conventional flotation system to be subjected to roughing, scavenging and concentration in sequence, wherein the roughing flotation time is 10min, 50-150g/t ore of copper sulfate, 20-100g/t ore of xanthate and 5-20g/t ore of No.2 oil are added, the scavenging flotation time is 6min, 10-50g/t ore of copper sulfate, 10-60g/t ore of xanthate and 5-15g/t ore of No.2 oil are added, the concentration flotation time is 5min, no medicament is added, and the second zinc concentrate with the grade of 47-50% is obtained; Step five, concentrate mixing Mixing the first zinc concentrate in the third step with the second zinc concentrate in the fourth step according to the mass ratio of 1:1.2-1:1.5 to obtain the final zinc concentrate with the grade of 50-52%, wherein the tailing zinc grade of the final zinc concentrate is controlled to be 0.04-0.11%.
2. 2. A beneficiation process for separating zinc concentrate according to claim 1, wherein in the first step, the pH regulator is lime.
3. 3. The beneficiation process for separating zinc concentrate according to claim 1, wherein in the second step, the lead mineral collector is ethionine, the zinc mineral inhibitor is zinc sulfate, and the foaming agent is No. 2 oil.
4. 4. A beneficiation process for separating zinc concentrate according to claim 1, wherein in the third step, the flotation time is 7-9min.
5. 5. A beneficiation process for separating zinc concentrate according to claim 1, wherein in the fourth step, rougher flotation time is 10min, scavenger flotation time is 6min, and beneficiation flotation time is 5min.

Description

Ore dressing process for separating zinc concentrate Technical Field The invention belongs to the technical field of mineral processing, and particularly relates to a beneficiation process for separating zinc concentrate, which is particularly suitable for beneficiation scenes with high requirements on the grade of zinc concentrate and production cost and tailing grade to be controlled. Background In zinc ore dressing production, the conventional zinc concentrate separation process mainly relies on a three-stage process of 'flotation machine roughing-flotation machine selecting-flotation machine scavenging', and the core principle is that zinc minerals and gangue minerals are separated through the action of a flotation reagent and mineral particles, so that a zinc concentrate product is finally obtained. However, the conventional process has the obvious technical defects that firstly, the roughing link is limited by the separation efficiency of a conventional flotation machine, the highest grade of zinc concentrate produced by roughing can only reach about 40 percent, the requirement of the roughing link on the grade of the zinc concentrate by over 50 percent in industrial production can not be met, secondly, in order to solve the problem of insufficient roughing grade, concentrate grade is required to be improved through repeated concentration operation, the cyclic load of the subsequent concentration link is directly increased (the cyclic load is improved by 30-50 percent compared with the ideal state), the retention time of the concentrate in a separation system is prolonged, the problem that concentrate cannot be discharged in time is solved, the mineral separation production efficiency is seriously influenced, thirdly, in order to ensure the zinc recovery rate of the scavenging link (the zinc mineral is prevented from running off along with the tailings), a large amount of flotation agent (the agent consumption is increased by 25-40 percent compared with the theoretical minimum value), the production cost is obviously improved, fourthly, the superposition effect of the high cyclic load and a large amount of the agent is caused, if the zinc content in the tailings exceeds the standard risk of the grade, the cyclic load is greatly increased by over 0.3 percent, the resource waste is caused, and the environmental protection pressure and the potential safety hazard of tailing storage are increased. In summary, the existing conventional zinc concentrate separation process cannot balance the production requirements of high grade, high efficiency, low cost and low tailing grade, and an innovative process method is needed to solve the technical pain. Disclosure of Invention The invention aims to provide a beneficiation process for separating zinc concentrate, which solves the problems of low roughing grade, high cyclic load, large medicament consumption and high tailing grade of the existing zinc concentrate separation process, and realizes the synergistic optimization of high-efficiency separation of zinc concentrate, cost reduction and tailing grade control. The invention has the technical scheme that 1, the beneficiation process for separating zinc concentrate is characterized by comprising the following steps: Step one, raw material pretreatment Crushing and grinding lead zinc ore raw ore until the fineness is-200 meshes with the proportion of 68% -78%, adding a pH regulator, adjusting the concentration of ore pulp to 25% -35%, and adjusting the pH value of ore pulp to 10.5-11.5; step two, lead mineral preferential floatation Adding a lead mineral collecting agent, a zinc mineral inhibitor and a foaming agent into the pretreated ore pulp with the pH value adjusted, wherein the adding amount of the lead mineral collecting agent is 80-100g/t of ore, the adding amount of the zinc mineral inhibitor is 300-500g/t of ore, and the adding amount of the foaming agent is 5-15g/t of ore; step three, pre-separation of jet flow microbubble flotation machine Conveying the zinc-containing tailing pulp obtained in the second step to a jet flow micro-bubble flotation machine, wherein the diameter of micro-bubbles generated by the jet flow micro-bubble flotation machine is 50-100 mu m, 300-550g/t of copper sulfate, 100-120g/t of xanthate and 5-15g/t of No. 2 oil are added, and flotation is carried out for 7-9min to obtain first zinc concentrate with the grade of 53-58%; step four, subsequent separation of conventional flotation machine The tailings obtained in the third step are conveyed to a conventional flotation system to be subjected to roughing, scavenging and concentration in sequence, wherein the roughing flotation time is 10min, 50-150g/t ore of copper sulfate, 20-100g/t ore of xanthate and 5-20g/t ore of No.2 oil are added, the scavenging flotation time is 6min, 10-50g/t ore of copper sulfate, 10-60g/t ore of xanthate and 5-15g/t ore of No.2 oil are added, the concentration flotation time is 5min, no medicament is