A slime dense medium system separation parameter control method

Abstract

The application discloses a kind of coal slime heavy medium system separation parameter control method, it is characterized in that: the method includes: coal slime heavy medium cyclone processing capacity is amplified, then coal slime heavy medium cyclone concentrate and tailings are returned to coal slime heavy medium cyclone feed according to proportion, and the proportion of concentrate return amount and tailings return amount is controlled to control coal slime heavy medium cyclone separation density;Effectively solve the problem that density of coal slime heavy medium system is uncontrollable in the combined process of raw coal heavy medium-coal slime heavy medium, realize the effective control to coal slime heavy medium system product quality, effectively improve the coarse and fine coal slime recovery efficiency, improve the production and operation benefit of coal preparation plant, also make coal slime heavy medium system get rid of the dependence on peripheral medium supplement system and water supplement system, greatly simplify the heavy medium coal preparation production system of coal preparation plant.

Description

Technical Field

[0001] This invention belongs to the field of coal preparation technology, specifically relating to a method for controlling the separation parameters of a coal slime heavy media system. Background Technology

[0002] In traditional coal slime heavy medium hydrocyclone coal preparation processes, independent medium feeding and water replenishment systems are required to achieve flexible adjustment of the separation parameters of the coal slime heavy medium hydrocyclone, resulting in an increase in the number of coal preparation process steps and a more complex system structure. In order to simplify the heavy medium coal preparation process system, in practical applications, the coal slime heavy medium coal preparation process is often combined with the raw coal heavy medium coal preparation process, sharing the medium feeding and water replenishment systems. The feed to the coal slime heavy medium hydrocyclone is the qualified medium diverted from the raw coal heavy medium. Although this process simplifies the coal slime heavy medium system, it has a significant drawback—the parameters of the coal slime heavy medium system are not adjustable, resulting in the inability to stably control the product quality of the coal slime heavy medium system. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for controlling the separation parameters of a coal slime heavy medium system, so as to solve the technical problem that the parameters of the coal slime heavy medium system are not adjustable when the coal slime heavy medium coal preparation process is combined with the raw coal heavy medium coal preparation process and the feed of the coal slime heavy medium cyclone is the qualified medium diverted from the raw coal heavy medium.

[0004] The technical solution adopted in this invention is as follows:

[0005] A method for controlling the separation parameters of a coal slime heavy medium system, the method comprising: increasing the processing capacity of a coal slime heavy medium hydrocyclone, then returning the concentrate and tailings of the coal slime heavy medium hydrocyclone to the feed of the coal slime heavy medium hydrocyclone in a certain proportion, and controlling the separation density of the coal slime heavy medium hydrocyclone by controlling the ratio of concentrate return amount to tailings return amount.

[0006] The capacity scaling factor of the coal slime heavy medium cyclone is 1.1-1.2 times.

[0007] The method for controlling the separation density of coal slime heavy medium hydrocyclones by controlling the ratio of concentrate return to tailings return is as follows:

[0008] Let V1 - V0 = V2 + V3 = Vx; V0 is the amount of qualified coal slime feed medium; V1 is the processing capacity of the coal slime heavy medium cyclone; V2 is the amount of concentrate diverted to the coal slime heavy medium cyclone feed medium; V3 is the amount of tailings diverted to the coal slime heavy medium cyclone feed medium; Vx is used to adjust the separation parameters of the coal slime heavy medium cyclone; by controlling the ratio of concentrate return to tailings return medium, V2 ÷ V3, the separation density of the coal slime heavy medium cyclone is controlled.

[0009] The control method includes:

[0010] When V2÷V3=V4÷V5, the separation density of the coal slime heavy medium cyclone remains unchanged.

[0011] When V2÷V3<V4÷V5, the separation density of coal slime heavy medium hydrocyclone gradually increases;

[0012] When V2÷V3>V4÷V5, the separation density of the coal slime heavy medium cyclone gradually decreases.

[0013] The beneficial effects of this invention are:

[0014] This invention appropriately scales up the processing capacity of a coal slime heavy medium hydrocyclone (the actual processing capacity is 1.1-1.2 times the required capacity). Then, utilizing the characteristic that the concentrate density of the coal slime heavy medium hydrocyclone is lower than the feed density and the tailings density is higher than the feed density, the concentrate and tailings are returned to the coal slime heavy medium hydrocyclone feed in a certain ratio. By controlling the ratio of concentrate return to tailings return, the separation density of the coal slime heavy medium hydrocyclone is controlled. This process not only effectively solves the problem of uncontrollable density in the coal slime heavy medium system in the "raw coal heavy medium-coal slime heavy medium" combined process, achieving effective control of the product quality of the coal slime heavy medium system, effectively improving the recovery efficiency of coarse and fine coal slime, and increasing the production and operation efficiency of the coal preparation plant, but also frees the coal slime heavy medium system from dependence on external supplementary medium and water systems, greatly simplifying the heavy medium coal preparation production system of the coal preparation plant. Attached Figure Description

[0015] Figure 1 A schematic diagram of the system flow of this invention. Detailed Implementation

[0016] This invention addresses the problem of unadjustable parameters in coal slime heavy media systems when there are no independent media addition or water replenishment systems. The invention provides a method for controlling the separation parameters of a coal slime heavy media system, specifically as follows: Figure 1 As shown.

[0017] In this invention, the processing capacity V1 of the coal slime heavy medium hydrocyclone is slightly greater than the qualified coal slime feed rate V0 (V1 is 1.1-1.2 times V0). The surplus processing capacity Vx is mainly used to adjust the separation parameters of the coal slime heavy medium hydrocyclone, and the quantitative relationship always satisfies the requirement V1-V0=V2+V3=Vx. Wherein: V2 is the amount of concentrate diverted to the coal slime heavy medium hydrocyclone feed, and V3 is the amount of tailings diverted to the coal slime heavy medium hydrocyclone feed. For a fixed production system, Vx can be considered a constant. In this invention, utilizing the characteristic that the density of the coal slime heavy medium hydrocyclone concentrate is lower than that of the feed and the density of the tailings is higher than that of the feed, the concentrate and tailings are returned to the coal slime heavy medium hydrocyclone feed in a certain proportion. By controlling the ratio of concentrate return to tailings return (V2÷V3), the separation density of the coal slime heavy medium hydrocyclone is controlled. During normal production, the ratio of concentrate (V4) to tailings (V5) in the heavy media hydrocyclone remains relatively stable. When V2 ÷ V3 = V4 ÷ V5, the separation density of the coal slime in the heavy media hydrocyclone remains unchanged; when V2 ÷ V3 < V4 ÷ V5, the separation density of the coal slime in the heavy media hydrocyclone gradually increases; when V2 ÷ V3 > V4 ÷ V5, the separation density of the coal slime in the heavy media hydrocyclone gradually decreases.

Claims

1. A method for controlling the parameters of a coal slime dense medium system, characterized in that: The method comprises: enlarging the processing capacity of the slime dense medium cyclone, then returning the slime dense medium cyclone concentrate and tailings to the slime dense medium cyclone feed in proportion, and controlling the slime dense medium cyclone separation density by controlling the proportion of the concentrate return amount and the tailings return amount; the method for controlling the proportion of the concentrate return amount and the tailings return amount to control the slime dense medium cyclone separation density is: the surplus processing capacity Vx is used to adjust the slime dense medium cyclone separation parameters, and the quantity relationship always satisfies the requirement of V1-V0=V2+V3=Vx; V0 is the slime qualified medium feed amount; V1 is the processing capacity of the slime dense medium cyclone; V2 is the amount of the slime dense medium cyclone concentrate shunted to the slime dense medium cyclone feed, and V3 is the amount of the slime dense medium cyclone tailings shunted to the slime dense medium cyclone feed; the proportion V2÷V3 of the concentrate return amount and the tailings return amount is controlled; and the slime dense medium cyclone separation density is controlled.

2. The method for controlling the separation parameters of a coal slime dense medium system according to claim 1, characterized in that: The processing capacity enlargement multiple of the slime dense medium cyclone is 1.1-1.2 times.

3. The method for controlling the separation parameters of a coal slime dense medium system according to claim 1, characterized in that: The control method comprises: when V2÷V3=V4÷V5, the slime dense medium cyclone separation density is unchanged; when V2÷V3<V4÷V5, the slime dense medium cyclone separation density gradually increases; when V2÷V3>V4÷V5, the slime dense medium cyclone separation density gradually decreases; V4 is the dense medium cyclone concentrate amount; and V5 is the dense medium cyclone tailings amount.

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