How to choose the location of flotation drug dosing?
The choice of dosing location is related to the use of the agent and the speed of dissolution.
The media conditioning agent is typically added to the ball mill to eliminate the deleterious effects of ionization on flotation that is activated or inhibited.
The inhibitor should be added before the collector and usually also added to the mill.
Activators are often added to blending tanks or flotation machines. Collector of insoluble (e.g. baiyao, coal oil), to promote dispersion and dissolution time, growth and minerals, but also often added in the mill. The yellow medicine is generally added to the overflow of the classifier, and is also added to the adjustment tank or the flotation machine.
The foaming agent is added to the adjustment tank or flotation machine. The usual dosing order is:
1) When flotation of raw ore, first add regulator → inhibitor → collector → foaming agent.
2) Add activator→collector→foaming agent first when flotation is inhibited.
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 was added to the mill, resulting in improved sorting index.
How many dosing methods are commonly used?
Flotation agents can be added in two ways: 1) one-time dosing; 2) segmented dosing.
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. In addition, the dosing method is also based on the nature of the ore. For example, when the soluble salts in the pulp are high and a large amount of the drug is adsorbed, it is advantageous to use a staged dosing. As another example, in some preferential flotation situations, it is often beneficial to add the collector in stages in order to mitigate the negative effects of the inhibitor on the desired floating mineral.
How to formulate and add flotation reagents?
The work of the drug trainer is very important. There are six common methods for formulating and adding pharmaceutical agents:
1) Add directly to the powdered solid (such as lime, soda).
2) Adjust into a milky suspension.
3) Add directly to the original liquid (such as pine oil, cresol, black medicine, kerosene, etc.).
4) Add 5-10% aqueous solution. Most water-soluble agents are added as such (eg, xanthate, water glass, copper sulfate, etc.).
5) Dissolve some water-insoluble agents in the solution (such as oleic acid dissolved in kerosene and white drug dissolved in o-toluidine).
6) Emulsifying the poorly soluble agent by mechanical stirring or ultrasonic method (such as oleic acid, kerosene, pine oil, etc.), and then adding the milky agent to the flotation process.
Commonly used methods of strengthening the medicine?
The role of fortified agents: can increase the flotation rate and improve the flotation index and reduce the amount of rare agents.
Several methods are commonly used at present: 1) mixed drugs; 2) correct control of other process factors; 3) correct selection of dosing sites and dosing methods; 4) proper storage of pharmaceuticals.
Practice has shown that mixing multiple collectors is much better than using a collector alone. Experiments show that, for example, when the flotation sphalerite, long-chain xanthate effective than short-chain and long-chain and short chain used in combination of more effective; in the copper-zinc flotation, ethyl, and butyl The combination of xanthate and butyl xanthate alone can reduce the loss of copper in tailings by 4% and the loss of zinc by about 1.5%.
Why do mixed medications improve flotation?
The good effect of the mixed drug is related to the unevenness of the mineral surface and the interaction between various agents. Mineral surface properties are not uniform, the degree of oxidation is different, there may be different activation zones for different collectors, so the mixed drug may increase the coverage density of the mineral surface collector, thereby improving the flotation effect. The co-adsorption by the interaction between various collectors can also increase the ability of the drug to capture and improve the flotation index.
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