Device and process for recovering jigging overflow coal slime to separate ultra-clean coal through physical cyclone flow

Abstract

The invention discloses a device and process for recovering jigging overflow coal slime to separate ultra-clean coal through physical cyclone flow. The ultra-clean coal separation device comprises a cyclone separation device, a spiral chute and a screening and dehydrating device. The cyclone separation device comprises a first-section flat bottom classifying cyclone device and a second-section large-cone-angle sorting cyclone device. The first-section flat bottom classifying cyclone device and the second-section large-cone-angle sorting cyclone device are each provided with a first overflow port, a second overflow port and a base flow port, and ultra-clean coal products can be obtained through screening at the second overflow ports. The spiral chute comprises four discharge ports for ore concentrate and the like. The screening and dehydrating device comprises a classifying screen, a coal slime centrifugal dehydrator, a pressure filter and other desliming and dehydrating devices. The spiral chute is arranged below the base flow port and can recover middling coal products. Part of ore pulp at the first overflow ports serves as make-up water of the chute. Water dehydrated from the dehydrating device in the system can serve as coal washing reuse water of a jigging machine. The invention further discloses an ultra-clean coal separation process. The device and process for separatingthe ultra-clean coal through the physical cyclone flow is novel and unique in idea, simple in process, free of addition of a fine iron powder medium to pure water and free of pollution to the environmental and products. Moreover, after the ultra-clean coal is separated, middling coal power coal products can be produced from other byproducts, and water resources can be cyclically utilized.

Description

technical field [0001] The invention belongs to the field of coal slime separation, and in particular relates to a device and method for recovering super-clean coal from jigging overflow by physical swirl. Background technique [0002] With the widespread application of mechanized coal mining and the decline of coal quality in my country, the content of primary and secondary fine-grained coal is gradually increasing. According to the research of the State Council Research Office, the slime content of selected tons of raw coal is about 20% today, and the slime produced in 2018 168 million tons. It is estimated that by 2020, the output of coal slime in my country will exceed 300 million tons. At present, it is mainly processed by directly mixing commercial coal or selling clean coal after flotation. Among them, the coal slime mixed with commercial coal accounts for 3 / 3. 4 or more, and unsorted coal slime has the characteristics of high ash / sulfur content, which will have a dire...

AI Technical Summary

Problems solved by technology

However, the preparation of ultra-clean coal by dense medium cyclone requires extremely precise medium concentration, serious medium consumption (average medium consumption is about 0.8kg / t), and medium and chemicals are easy to remain in ultra-clean coal products, causing inevitable damage to the product pollution

[0006] To sum up, the existing methods of processing coal slime and producing ultra-clean coal have problems such as serious environmental pollution, residual impurities in the product, high cost, and complicated process, and the country's higher requirements for the ecological environment have negative impacts on my country's energy production and consumption. The structure will produce a reverse mechanism, and the promotion and application of coal (coal slime) clean utilization technology will be highly valued

Images