Metal ore flotation agent addition sequence and automatic dosing system

Copper mineral flotation machine, lead zinc ore, iron ore flotation agent impressions, copper, lead-zinc ore flotation processes include grinding, classification, and flotation slurried roughing, selection, Sweep the job.

There is a period of grinding and floating process; stage grinding-flotation stage grinding process; concentrate or medium mine re-grinding process. The operation of flotation to produce coarse concentrate is called rough selection; the refining operation of coarse concentrate is called selection; the tailings re-election operation is called sweeping. When recovering a variety of useful minerals in ore, the process of successive flotation of different minerals is called preferential flotation or flotation; the process of first separating all useful minerals and then separating them is called mixing-separation flotation. Industrial production must be based on the nature of the ore and the requirements of the product, using different prescriptions and flotation processes.

The common flotation machine dosing order is:

1. When flotation of raw ore, first add regulator → inhibitor → collector → foaming agent.

2. When the flotation is inhibited, the activator → collector → foaming agent is added first.

In order to improve the efficiency of the action of the agent, it is usually necessary to stir the agent with the slurry for a certain period of time before the flotation, and the length of the stirring is mainly related to the solubility of the agent. Usually 5-20 minutes, short 1-5 minutes. In addition, the choice of dosing location should also consider the nature of the ore. For example, some copper sulfide-iron ore flotation plant xanthate is added to the mill, and the results have improved the selection index.

One-time dosing means adding a certain agent to the slurry before flotation. This can increase the initial speed of the flotation process. Although the speed is reduced in the later stage, the total flotation time is still short, which is beneficial to improve the flotation index. Generally, for drugs that are easily soluble in water, which are not taken away by the foam machine, and which are not easily reacted in the slurry and are ineffective (such as xanthate, soda, and lime), dosing should be used once.

Segmented dosing refers to the addition of a certain agent in several batches during the flotation process. Generally, 60-70% of the total amount is added before the flotation, and the remaining 30-40% are added to the appropriate places in several batches. Such a staged dosing can improve the quality of the concentrate, but the overall flotation time increases due to the reduced speed at the beginning of the flotation. Generally, it is insoluble in water, easy to be taken away by foam machinery, easy to react in pulp, and some agents with poor selectivity or easy to decompose and fail (such as oil collector, pine oil, Sodium sulphide) should be applied in stages.

Copper ore flotation copper sulfide minerals are commonly used in the treatment of xanthate (collector), pine oil (foaming agent) and lime (adjusting agent), and are floated to separate from gangue and symbiotic iron sulfide minerals. . Most of them use priority flotation. Copper oxide ore is generally activated by sodium sulfide and then added with xanthate flotation, or directly using fatty acid as a collector for flotation.

When the lead-zinc ore flotation adopts the preferential flotation process, the zinc blende is inhibited by zinc sulfate and cyanide, and the galena is floated with xanthate; then the copper sulfate is activated and the xanthate floatation is added to the sphalerite. When the mixed flotation process is adopted, the lead and zinc minerals are first floated out together with the xanthate; then the zinc ore is inhibited by the mixed concentrate with zinc sulfate and cyanide, and the lead mineral is floated. Many beneficiation plant using sulfurous acid and its salts instead of cyanide.

Iron ore flotation commonly used oleic acid, tal oil, oxidized paraffin soap or petroleum sulfonate as collector (also foaming agent), flotation of hematite, limonite and other minerals, said iron ore is floating; Or flotation of quartz with a cationic amine collector, or flotation of calcium-activated quartz with an anionic collector, called iron ore reverse flotation. The fine-grained iron ore can be treated by a flocculation-de-sludge-reverse flotation process.

Tungsten, and tin sludge flotation of fine mud containing wolframite or cassiterite, arsenic acid, oleic acid or toluene or styrene phosphoric acid as collector, water glass as gangue inhibitor flotation recovery. Lead nitrate or the like is sometimes used as an activator.

Fluorite and apatite flotation are commonly used as tarnish or oxidized paraffin soap or tar oil as collectors, and water glass, tannin extract, sulfonated crude phenanthrene and the like are used as gangue inhibitors for flotation.

Coal flotation clay and graphite is generally used as blowing agents include alcohols, kerosene and other neutral oil as a flotation collector.