Inhibitor-free efficient flotation technology for lead-zinc-sulfur preferential flotation whole process

Abstract

The invention discloses an inhibitor-free high-efficiency flotation process for a lead-zinc-sulfur preferential flotation whole process, which cancels the addition of an inhibitor in the lead-zinc-sulfur flotation whole process, adopts overflow water of a zinc concentrate thickener to replace a zinc inhibitor, and comprises the following steps: (a) lead flotation operation: adopting the overflow water of the zinc concentrate thickener to inhibit zinc minerals, a collecting agent with high selectivity is added for flotation of lead minerals; (b) zinc flotation operation: adding an activating agent and a collecting agent with higher selectivity into lead flotation tailings for flotation of zinc minerals, wherein a sulfur inhibitor is not added; and (c) sulfur flotation operation: adding a collecting agent into the zinc flotation tailings for flotation of sulfur minerals, not adding an inhibitor and an activating agent, not adjusting the pH value, not adjusting the concentration and not desliming. According to the method, an inhibitor (lime / zinc sulfate / sodium sulfite) is eliminated in the whole process, a strong-selectivity collecting agent is adopted, inhibition on associated gold and silver in the lead-zinc mineral is relieved, the silver recovery rate is increased to be larger than or equal to 69.55% from 51%, the silver content of the lead concentrate is increased to be larger than or equal to 1733.77 g / t from 1500 g / t, and the gold and silver recovery rate is synchronously increased by 10% or above.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flotation process, in particular to a high-efficiency flotation process without inhibitor in the whole process of lead-zinc-sulfur preferential flotation. BACKGROUND

[0002] A lead-zinc-silver mine is exploited underground, and the raw ore contains multiple metals such as lead, zinc, sulfur, gold and silver. The beneficiation process adopts a conventional lead-zinc-sulfur preferential flotation process. In the conventional reagent scheme, lime + zinc sulfate + sodium sulfite are used as inhibitors for lead selection, and a collector is further added. The tailings of lead selection are used for zinc selection, and the conventional reagent scheme uses lime as an inhibitor and copper sulfate as an activator, and a collector is further added. The tailings of zinc selection are used for sulfur selection, and the conventional reagent scheme uses copper sulfate as an activator and butyl xanthate as a collector.

[0003] The conventional reagent process scheme uses a large amount of inhibitors, which gradually exposes some problems. The main problems are: 1) the recovery rate of rare and precious metals such as gold and silver in lead concentrate is low; 2) the addition of zinc inhibitors in lead flotation results in low zinc recovery rate; 3) the conventional lime high-alkali process has a series of problems such as safety and environmental protection, which also inhibits the recovery of gold and silver in lead-zinc flotation. The original process flow chart is shown in Figure 1 SUMMARY

[0004] The present application relates to the field of flotation process, in particular to a high-efficiency flotation process without inhibitor in the whole process of lead-zinc-sulfur preferential flotation.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: A high-efficiency flotation process without inhibitor in the whole process of lead-zinc-sulfur preferential flotation cancels the addition of inhibitors in the whole process of lead, zinc and sulfur flotation, and uses zinc concentrate thickener overflow water to replace zinc inhibitors. The process comprises the following steps: (a) Lead flotation operation: zinc mineral is inhibited by using zinc concentrate thickener overflow water, and a selective collector is added to float lead mineral; (b) Zinc flotation operation: an activator and a selective collector are added to float zinc mineral from the tailings of lead flotation; (c) Sulfur flotation operation: a collector is added to float sulfur mineral from the tailings of zinc flotation, and no activator or inhibitor is added.

[0006] Further, the zinc concentrate thickener overflow water contains 15-20 mg / L of zinc ions, which is directly used to inhibit zinc mineral in lead flotation operation.

[0007] Further, the addition of inhibitors is completely canceled in lead flotation operation and zinc flotation operation, including lime, zinc sulfate and sodium sulfite. ​

[0008] Further, the selective collector is a strong selective reagent, which is used for strengthening the collection of lead, zinc, gold and silver and weakening the collection of non-target minerals.

[0009] Further, the overflow water of the zinc concentrate thickener is directly transported to the lead flotation mixing tank through a pipeline for recycling.

[0010] Further, in the zinc flotation operation, the activator is copper sulfate, the collector is a strong selective collector, and no sulfur inhibitor is added.

[0011] Further, in the sulfur flotation operation, only the collector is added, no inhibitor or activator is added, the pH value is not adjusted, the concentration is not adjusted, and no desliming is performed.

[0012] Further, the strong selective collector simultaneously strengthens the collection of gold and silver minerals in lead flotation and zinc flotation, so that the gold and silver recovery rate is increased by more than 10%.

[0013] Further, the addition amount of the overflow water of the zinc concentrate thickener in the lead flotation operation is 20-30% of the total ore slurry volume.

[0014] The beneficial effects of the present application are: 1. The present application cancels the inhibitor (lime / zinc sulfate / sodium sulfite) in the whole process and uses a strong selective collector, thereby relieving the inhibition of associated gold and silver in lead and zinc minerals, so that the silver recovery rate is increased from 51% to ≥69.55%, the silver content in the lead concentrate is increased from 1500 g / t to ≥1733.77 g / t, and the gold and silver recovery rate is simultaneously increased by more than 10%; 2. The present application uses the overflow water of the zinc concentrate thickener (containing Zn²⁺ 15-20 mg / L) to replace the artificial inhibitor, and adds 20-30% of the total ore slurry volume, which is recycled to the lead flotation operation through a pipeline, thereby inhibiting the zinc minerals while avoiding excessive inhibition, so that the zinc recovery rate is increased from 81.26% to ≥87.15%; 3. In the zinc flotation, copper sulfate activation + strong selective collector is used, which is coordinated with the overflow water recycling process, so that the zinc recovery rate is increased by 5.89 percentage points (81.26%-87.15%), and the lead recovery rate is increased by 5.13 percentage points (85.5%-90.63%). BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the original process flowchart in the background art.

[0016] Figure 2 It is the process flowchart of the present application. DETAILED DESCRIPTION

[0017] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0018] Referring to Figure 2 A high-efficiency flotation process without inhibitors in a lead-zinc-sulfur preferential flotation full process cancels the addition of inhibitors in the lead-zinc-sulfur flotation full process and uses zinc concentrate thickener overflow water to replace zinc inhibitors, comprising the following steps: (a) Lead flotation operation: zinc minerals are inhibited by using zinc concentrate thickener overflow water, and selective lead minerals are floated by adding a selective collector, without adding zinc inhibitors; (b) Zinc flotation operation: zinc minerals are floated by adding an activator and a selective collector to the lead flotation tailings, without adding sulfur inhibitors; (c) Sulfur flotation operation: sulfur minerals are floated by adding a collector to the zinc flotation tailings, without adding inhibitors, activators, without adjusting pH value, without adjusting concentration, and without desliming.

[0019] Among them, the addition amount of zinc concentrate thickener overflow water in the lead flotation operation is 20-30% of the total slurry volume, and the zinc concentrate thickener overflow water contains 15-20 mg / L of zinc ions, which is directly used to inhibit zinc minerals in the lead flotation operation.

[0020] In the lead flotation operation, zinc flotation and sulfur flotation operation, the addition of inhibitors is completely canceled, including the cancellation of lime, zinc sulfate and sodium sulfite. The selective collector is a strong selective reagent, which is used to strengthen the collection of lead, zinc, gold and silver and weaken the collection of non-target minerals. The zinc concentrate thickener overflow water is directly transported to the lead flotation stirring tank through a pipeline for recycling.

[0021] In the zinc flotation operation, the activator is copper sulfate, the collector is a strong selective collector, and no sulfur inhibitor is added.

[0022] In the sulfur flotation operation, no inhibitors, activators, pH value adjustment, concentration adjustment and desliming are added, and butyl xanthate is used as the collector.

[0023] The strong selective collector simultaneously strengthens the collection of gold and silver minerals in the lead flotation and zinc flotation, and the use of inhibitors is canceled to increase the gold and silver recovery rate by more than 10%.

[0024] The specific method is as follows: In the lead flotation series, the use of zinc inhibitors is canceled, and the 15-20 mg / L of zinc ions in the zinc concentrate thickener overflow water are used to inhibit zinc in the lead flotation process. The use of the thickener overflow water instead of the inhibitors greatly improves the zinc recovery rate.

[0025] Cancel all inhibitors in lead, zinc, sulfur flotation process, use strong selectivity reagent to strengthen the collection of lead, zinc, gold, silver, and weaken the collection of non-purpose minerals. This method greatly improves the recovery rate of lead, zinc, gold and silver.

[0026] The modified process flow chart is shown in the attached Figure 2 A kind of lead-zinc-sulfur preferential flotation whole process high-efficiency flotation process without inhibitor has achieved good results since application: lead recovery rate is improved from 85.5% before implementation to 90.63%;The Ag content of lead concentrate is improved from 1500g / t before implementation to 1733.77g / t;The silver recovery rate of lead concentrate is improved from 51% to 69.55%;The zinc concentrate recovery rate is improved from 81.26% to 87.15%.

[0027] The implementation of lead-zinc-sulfur preferential flotation whole process high-efficiency flotation process not only improves the recovery rate of lead, zinc, gold and silver, but also greatly reduces the amount of inhibitor. Due to the increase of recovery rate and the reduction of reagent cost, the enterprise has brought huge economic benefits, and also reduced the emission of more than 4600 tons of carbon dioxide during the production of inhibitors, which has contributed to environmental protection.

[0028] The main points of lead-zinc-sulfur preferential flotation whole process high-efficiency flotation process are as follows: 1. In the lead flotation series, the use of zinc inhibitor is cancelled, and the 15-20mg / L zinc ions in the zinc concentrate thickener overflow water are used to inhibit zinc in the lead flotation process. The use of thickener overflow water instead of inhibitor is the first in the country. 2. All inhibitors in lead and zinc flotation process are cancelled, and strong selective reagent is used to strengthen the collection of lead, zinc, gold and silver, and weaken the collection of non-purpose minerals. The lead-zinc-sulfur preferential flotation process whole process without inhibitor is also the first in the country, which is very rare. 3. No inhibitor, activator is added in sulfur flotation operation, no PH value is adjusted, no concentration is adjusted, no desliming.

[0029] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them;Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features;And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-efficiency flotation process for lead-zinc-sulfur preferential flotation without inhibitors, characterized by: Eliminate the addition of inhibitors throughout the entire flotation process for lead, zinc, and sulfur, and use zinc concentrate thickener overflow water to replace zinc inhibitors, including the following steps: (a) Lead flotation: zinc concentrate thickener overflow water is used to suppress zinc minerals, and a highly selective collector is added to float lead minerals; (b) Zinc flotation: zinc minerals are floated by adding an activator and a highly selective collector to the lead flotation tailings without adding sulfur inhibitors; (c) Sulfur flotation operation: Add collector to zinc flotation tailings to float sulfur minerals without adding inhibitors, activators, adjusting pH value, concentration or desludging.

2. The process according to claim 1, characterized in that: The zinc concentrate thickener overflow water contains 15-20 mg / L zinc ions and is directly used in lead flotation operations to suppress zinc minerals.

3. The process according to claim 1, characterized in that: The lead flotation operation, the zinc flotation operation and the sulfur flotation operation completely eliminate the addition of inhibitors, including eliminating lime, zinc sulfate and sodium sulfite.

4. The process according to claim 1, wherein: The collector is a highly selective agent used to enhance the capture of lead, zinc, gold and silver and weaken the capture of non-target minerals.

5. The process according to claim 2, characterized in that: The overflow water of the zinc concentrate thickener is directly transported to the lead flotation stirring tank through a pipeline for recycling.

6. The process according to claim 1, characterized in that: In the zinc flotation operation, no sulfur inhibitor is added and the collector is a highly selective collector.

7. The process according to claim 1, characterized in that: In the sulfur flotation operation, only a collector is added without adding an inhibitor or an activator, adjusting the pH value or the concentration, or removing mud.

8. The process according to claim 4, characterized in that: The highly selective collector simultaneously enhances the capture of gold and silver minerals in lead flotation and zinc flotation, thereby increasing the gold and silver recovery rate by more than 10%.

9. The process according to claim 1, characterized in that: The amount of zinc concentrate thickener overflow water added in the lead flotation operation is 20-30% of the total pulp volume.

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