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Correct adding method and steps of mineral processing reagent
Category： Industry Information
2024-01-31 10:08
The purpose of reasonable addition of the agent is to ensure the maximum efficiency of the agent in the pulp and maintain the optimal concentration. Therefore, according to the characteristics of the ore, the nature of the agent and process requirements, a reasonable choice of dosing location and dosing methods.
1. Dosing location
The choice of dosing location is related to the use and solubility of the agent. The medium adjusting agent is usually added to the grinding machine, so as to eliminate the harmful effect of "inevitable" ions on flotation caused by activation or inhibition. The inhibitor should be added before the collecting agent, usually also to the grinding machine. The activating agent is often added to the blending and stirring tank to blend with the ore slurry for a certain period of time in the tank. Collectors and foaming agents are added to the blending tank and tank or flotation machine, while insoluble collectors (such as cresol black medicine, white medicine, coal, oil, etc.) are often added to the grinding machine in order to promote their dissolution and dispersion and lengthen the action time with minerals.
The common dosing sequence is:
(1) When flotation of raw ore, regulator-inhibitor-collector-frother;
(2) Activator-collector-frother when flotation of the depressed mineral.
In addition, the selection of the dosing location should also consider the nature of the ore and other specific conditions. For example, some copper sulfide-iron ore flotation plant xanthate added to the mill, the results improved the copper selection index, in addition, the grinding cycle to install a single-tank flotation machine to recover the dissociated coarse ore particles, in order to increase the collector action time, also need to be added to the mill.
2. Dosing method
Flotation reagents can be added in two ways: one-time addition and batch addition.
One-time addition refers to adding a certain agent into the pulp before flotation, so that the agent concentration at a certain operation point is high, the strength factor is large, and the addition is convenient. Generally, one-time addition is often used for agents (such as soda, lime, etc.) that are easily soluble in water, are not mechanically carried away by foam, and are not easy to react and fail in the pulp.
Batch dosing refers to the addition of a certain reagent in several batches during the flotation process. Generally, 60% ~ 70% of the total amount is added before flotation, and the remaining 30% ~ 40% is added to the appropriate location in several batches. Such batch dosing can maintain the reagent concentration along the flotation line and is conducive to improving the concentrate quality.
Batch addition shall be used for the following:
(1) Soluble in water, easy to be taken away by the foam agent (such as oleic acid, fatty amine collector).
(2) in the pulp is easy to react or easy to decompose the failure of the agent. Such as carbon dioxide, sulfur dioxide, etc., if only added at one point, it will quickly react to failure.
(3) The dosage requires strict control of the agent. Such as sodium sulfide, local concentration is too large, will lose the selective effect.
The action time of the medicine is not the same. The medicine commonly used in practice can be determined by experience, such as pine oil for 1~2min and xanthate for 1~3min.
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