Realizing method and device of coal slime semi-concentrate flotation process

Abstract

The invention relates to a realizing method and device of a coal slime semi-concentrate flotation process. The realizing method comprises the steps that coal slime in a coal preparation plant is divided into three parts to enter a concentrate machine, a slurry mixing barrel and a slurry mixing tank correspondingly; high-concentration ore slurry and low-concentration ore slurry are subjected to coarse mixing firstly and then subjected to fine mixing to be ore slurry with the concentration being 90-120 g / L; and the prepared ore slurry automatically flows into an ore slurry preprocessor to be pre-mineralized and then enters a flotation machine to be floated. The realizing device comprises the concentrate machine, an underflow pump, the slurry mixing barrel, electric adjusting valves, static pressure sensors, a trans-permutation pump, the slurry mixing tank, manual adjusting valves, a concentration meter, a flowmeter, the ore slurry preprocessor, the floatation machine and an intelligent controller processing and controlling a feedback signal, wherein the electric adjusting valves, the static pressure sensors and the concentration meter are connected with the intelligent controller through a wired mode. Precise, flexible and adjustable matching of the ore slurry with the high-concentration being 350-450 g / L and the ore slurry with the low-concentration being not more than 60 g / L is achieved, and it is guaranteed that the concentration of the floating ore slurry entering the ore slurry preprocessor is within the concentration range of 90 g / L-120 g / L all the time, and the concentration is relatively stable.

Description

technical field [0001] The invention belongs to the technical field of flotation, and in particular relates to a method and a device for realizing a coal slime water semi-concentration flotation process. Background technique [0002] Flotation technology is the most economical and effective separation method of fine coal slime, and it is also an important method for deep separation of coal. With the improvement of coal mining mechanization, the amount of pulverized coal in the raw coal of the coal preparation plant is increasing, and the flotation operation becomes more and more important. Moreover, the flotation operation is also an important link in the slime water treatment system of the coal preparation plant, which plays an important role in realizing the closed circulation of the slime water and environmental protection. [0003] At present, most of the coal preparation plants in my country basically adopt the direct flotation process, but in recent years, in order to...

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Problems solved by technology

[0003] At present, most of the coal preparation plants in my country basically adopt the direct flotation process, but in recent years, in order to reduce production costs, various coal preparation plants often use the pre-deliming process. Low concentration and large flow rate; in addition, with the increasingly stringent requirements of the country on environmental protection and users' requirements on product quality, there are more and more coal slime flotation systems in steam coal preparation plants, but the proportion of final coal washing in steam coal preparation plants Low, flexible production methods, low concentration of coal slime water (less than 40g / L in most plants) and large fluctuations, resulting in large amount of floating pulp and low concentration of coal slime water when supplementing the flotation system, large equipment selection, and high investment High cost; in the production process, the floating concentration is low and fluctuates frequently, the process parameters are difficult to control, the drug consumption is high, the product index is unstable, and the production cost is high

[0004] In order to ensure a suitable and stable concentration of the flotation pulp, the concentration flotation technology has been valued by the industry again in the past two years, but there are two major disadvantages in the traditional concentration flotation: 1. Based on the bottom flow large discharge process, the bottom flow of the thickener is used for flotation If the material is selected into the flotation, the concentration of the flotation is high, and more supplementary water needs to be added during the flotation process, resulting in an increase in the amount of circulating water; 2. Without adding any chemicals, the overflow of the thickener has a high content of fine mud, and the reciprocating cycle seriously affects the re-election , flotation and other links of effective sorting

[0005] Aiming at the above-mentioned deficiencies in the existing coal slime direct flotation or concentrated flotation process, a semi-concentrated flotation process is provided. This process increases the concentration of the floated pulp from about 40g / L to 80~150g / L, which improves 2 times, significantly increased the probability of contact between coal particles and flotation chemicals, and reduced the consumption of flotation chemicals by more than half; The investment cost can be reduced by more than half if the type selection is small or the number of units is small. In addition, the overflow of the thickener is close to the clean water by adding flocculant quantitatively, which can be directly used as circulating water, which effectively solves the problem of high fine mud content in the overflow of the thickener in the traditional thickening and flotation process. , reciprocating cycle, adverse effects on re-election and flotation links

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