Process for heavy media separation of coarse coal slurry

Abstract

A heavy medium coal-dressing process for recovering all the coarse slime is based on the simplifier JZJ technology and features its additional technological steps such as concentrating the suspension of diluted medium, mixing it with suspension of clean coal, regulating the dressing density, separating by small-diameter cyclone equipment, removing medium and recovering product. Its advnatages are simple system, high outupt rate of clean coal, and low cost.

Description

technical field [0001] The invention relates to a coal washing method, in particular to a dense medium coal washing process. Background technique [0002] At present, it is developed by Tangshan Branch of Coal Research Institute (now transformed into Tangshan Branch of Tiandi Science and Technology Co., Ltd.) and promoted in coal preparation plants across the country. Coal technology, in December 2000, the unit successfully developed the JZJ simplified dense medium coal preparation process on the basis of the above-mentioned technology. The "Dense Medium Cyclone Coal Preparation" book published by the publishing house in September 1998, pages 91-92, contained domestic and foreign coal preparation plants using small-diameter dense medium cyclones to separate 0.5-0mm or 1.0- The post-selection desliming and sorting coarse coal slime process in the 0mm grade high-sulfur difficult coal separation technology is the first time to combine the three-product dense medium cyclone sor...

AI Technical Summary

Problems solved by technology

However, the problem still exists in this set of technology is that only the part of the high-concentration sieve under the clean coal arc-shaped separation screen of the main cyclone is included in the coarse coal slime separation system, and a large amount of water in the system passes through the vibrating screen and sprays water. The coarse slime that has been removed and entered into the weak liquid is not sorted, that is to say, the amount of coarse slime sorted by the small-diameter dense medium cyclone in the system only accounts for 1 / 2 to 3 of the total amount of coarse slime About one-third of the total amount of coarse coal slime in thin liquid, which accounts for about one-half to two-thirds of the total amount of coarse coal slime, cannot be directly separated by small-diameter cyclone due to its concentration is too thin and the flow rate is too large , the final part enters the product from the dehydration and grading equipment without sorting, which affects the product quality, leads to the loss of clean coal slime and reduces the recovery rate, and the other part directly enters the flotation, which increases the processing capacity of the flotation system. Increased load rate of flotation equipment

As a result, the cost of coal washing increases and the production profit decreases

Of course, in theory, in the existing system, the method of increasing the suspension pressure can further reduce the lower limit of the separation of the main cyclone, but increasing the suspension pressure also brings about the problem of wear on the cyclone, especially in the The above approach is not feasible when the life of the cyclone has not been completely resolved at the current level of mechanical manufacturing.

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