Is it difficult to flotate fine-grained lead-zinc ore? What's the difficulty? how to improve?

15311826613

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Lead-zinc ore is an important strategic resource in my country. It is used in the fields of electrical, machinery, military, metallurgy, chemistry, light industry and medicine, and occupies an important position.

my country's lead-zinc ore resources are rich in reserves and widely distributed, but there are few large-scale deposits, many poor ores, few rich ores, and most of them are associated with them. With the increasing depletion of coarse-grained and easily separated lead-zinc ore resources in my country, fine-grained lead-zinc ore has become the main mineral resource for obtaining lead and zinc resources.

Although flotation is the main means of separation of fine-grained lead-zinc ores, there are also difficulties in separation. So what are the specific difficulties? How to choose?

The flotation recovery of fine-grained lead-zinc ore is difficult, mainly reflected in two aspects: First, the flotation speed is slow; Second, the recovery rate is low. There are four main reasons for this:

1. Fine-grained lead and zinc minerals are small in quantity and have high surface energy. Non-selective coagulation is easy to form between different mineral particles, and fine particles are easy to attach to coarse-grained minerals. A slime cover forms on the surface, thus affecting the separation of lead and zinc minerals from impurity minerals.

2. The mineral surface area and surface energy of fine-grained lead-zinc ore are large, and its ability to adsorb chemicals is strong, but the adsorption selectivity is poor, so the flotation efficiency is not ideal.

3. The finer the particle size of lead-zinc ore minerals, the more "inevitable ions" are dissolved in the slurry. Due to their small mass, they are easily entrained by water flow machinery and foam machinery.

4. Due to the reduction in the contact efficiency and adhesion efficiency between fine-grained minerals and bubbles, the collection efficiency of the bubbles on the mineral particles decreases. At the same time, the "armoring" phenomenon produced by the mineral mud on the bubbles also affects the transportation of the bubbles. quantity.

What are the measures to improve the efficiency of fine particle flotation? We can improve it through the following four situations:

1. Strengthen the dispersion of fine-grained minerals to prevent the fine-grained minerals in the slurry from agglomerating with each other and adhering to the surface of coarse particles.

2. By using selective polymer flocculants, try to bridge the fine-grained useful minerals together to increase their apparent particle size, thereby improving their selectivity.

3. Use agents with good selectivity to improve their effectiveness. The foam produced by the foaming agent should have appropriate brittleness in order to enhance the secondary enrichment effect and reduce the entrainment of fine mud; strictly control the dosage and use segmented addition as much as possible.

4. Increase the solubility of air in the slurry, improve the bubble formation mechanism, increase the amount of active microbubbles in the slurry, achieve microbubble flotation, and appropriately extend the flotation time to fully recover the target minerals.

The above are several reasons why fine-grained lead-zinc ore beneficiation is difficult, as well as several removal measures to improve flotation technology. If you want to obtain the ideal lead-zinc ore concentrate grade, you need to design a reasonable beneficiation process. Only process plans and suitable mineral processing equipment can effectively guarantee the return on investment.