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Flotation test is used to determine the charging capacity, pulp concentration, pH value, types and dosage of flotation reagent, reaction time of the flotation process. It is very necessary before the formal production. Flotation test mainly includes three steps:
First of all, researching the characteristics of the ore according to the ore samples sent by the customer, and initially formulate a flotation test scheme based on field experience and professional knowledge.
The particle size of ore in flotation test is generally required to be less than 1-3mm, and the particle size of this range is suitable for the ore feeding particle size used in flotation test, which can also ensure the representativeness of ore samples. Therefore, the ore sample is firstly crushed to make the sample reach the required particle size. The samples after crushing are evenly mixed and divided into several samples, with the content of each sample being about 500-1000g. For low-grade ores, the content of each sample can be increased to 3000g.
Attention should be paid to the prevention of sample contamination and the oxygen isolation of easily oxidized minerals during sample preparation.
This is especially important during flotation test, and it needs to be prepared in advance and well preserved to keep it alive. Always check to see if flotation reagent is within the shelf life to make sure it is available, and then store it in a dry container and in the shade before use.
The laboratory should be equipped with a variety of grinding mills of different sizes to ensure that different doses of samples can be ground.
The laboratory basically chooses the small mechanical stirring type flotation machines. Several small size single slot flotation machines can be selected, such as 0.5L, 0.75L, 1.0L, 1.5L and 3.0L.
Generally, the laboratory uses the tap water in the area for flotation test. After determining the main process conditions, the water source that may be used by the flotation plant in the future will be checked.
6. To make the above basic preparations, clean instruments and tools should be prepared in advance.
Flotation test mainly includes pre-test, condition test, closed-circuit test, intermediate test and industrial test. The main purpose is to determine the ore flotation process and indicators, and finally determine the best flotation conditions.
Flotation test process generally includes grinding, slurry mixing, flotation (scraping) and target product processing steps.
First, empty running the grinding machine and clean it. The grinding operation is then carried out. In this process, it is necessary to pay attention to whether the grinding speed is normal, whether the operation is smooth, whether the grinding sound is normal and so on, and accurately record the grinding time. At the end of grinding, the slurry shall be flushed into the receiving vessel with clean water. After all is poured out, clean the grinding mill.
A certain amount of flotation reagents should be added to the agitation tank in batches for mixing and stirring, so as to promote the suspension of ore particles and even dispersion in the flotation tank, promote the air dispersion, make the ore particles in full contact with bubbles, and ensure the flotation effect.
Ensure that the volume of gas is stable and constant, continue to inflate stirring. Adjust foaming agent dosage, pulp page height, stable scraping out a certain amount of bubbles in high quality. The foam layer thickness of the laboratory flotation machine is generally controlled at 25-50 mm. During the operation process, due to the continuous scraping of foam, the grout level of the tank continues to decline. At this point, water is added without affecting the pH of the slurry to ensure that the foam can be continuously scraped. The pH and temperature of the slurry must be measured and recorded at the beginning and end of the foaming process in preparation for later analysis. After flotation process, pour out the tailings slurry and clean the flotation machine.
The pulp discharged by the flotation machine needs to be dehydrated and dried. After drying, the product should be weighed and sampled for chemical analysis.
The above is the whole process of flotation test. During the flotation test, you must pay attention to the influence of various factors. It is recommended that the owners of flotation plants choose companies specializing in mineral test for flotation test.
1Development of Froth Flotation 10 1987