In the beneficiation process of residual placer tin ore, gravity separation process is often used. It is a method of separating useful minerals from impurities by using the difference in specific gravity between ores. Let's take a closer look at the steps of this process.
First of all, the raw ore needs to be crushed and ground. Crushing allows the ore to be sized to a level suitable for beneficiation and also facilitates subsequent particle level separation. The purpose of grinding is to fully crush and dissociate tin ore and impurity ore. However, it should also be noted that over-grinding will cause tin mineral particles to be too fine, which will affect the effect of gravity separation.
Secondly, the ore is fed into the thickener for rough or pre-separation. The concentrator classifies the sand and gravel according to the difference in gravity, dividing the sand and gravel into sediments (mainly heavy minerals) and tailings (mainly light minerals). In this step, the fine-grained sediment containing tin-containing minerals is usually removed and sent to the mixed leaching process for processing.
Then, the washing concentrate was subjected to equipment magnetic separation, and some of the magnetic ores were eliminated by using the magnetic differences of the ores, so as to further improve the grade of tin-containing ore. After the end of the magnetic separation process, desulfurization, dehydration and other treatments can be carried out, and then the process can enter the next step.
To further improve the beneficiation efficiency of tin ore, it can remove the quartz particles and thin clay film attached to the surface of tin ore, so that the surface of tin ore is exposed, so as to improve the beneficiation effect of tin ore.
Finally, rough selection and selection are carried out. The purpose of rough separation is to further improve the grade of tin ore and reduce the impurity content, so as to achieve the expected process indicators; Selective is to further separate the products obtained from rough separation to improve the first rate of tin and achieve higher grade tin concentrate.
In general, through the above-mentioned complete ore gravity separation process, it can effectively separate tin minerals with a certain grade from residual placer tin ore. This process requires a professional design according to a specific process, and the delicate and careful operation is carried out to obtain high-quality tin ore.
However, not all placers are suitable for the above gravity separation procedures, and some placers with low ore content or unique material properties may require a specially tailored beneficiation process. It is necessary for the beneficiation engineer to carry out technical design and process optimization in a scientific and reasonable way according to the actual situation, so as to maximize the efficient beneficiation of residual placer tin ore.