Power coal washing selection process and preparation

The task of developing thermal coal washing in China is extremely arduous, so it is necessary to seek simple processes and equipment with low initial investment and low operating costs.

The basic way to simplify the process of heating coal washing: First, according to the particle size composition and density composition characteristics of raw coal and user requirements, properly determine the separation depth, and do not wash the fine-grained materials as much as possible, thus simplifying product dewatering and slime water treatment. Second, under the condition that the surface moisture of the raw coal is low and can be effectively graded, the wind dry sorting is preferred. It should be noted that the above plan is a near-term goal, while the long-term goal is to deepen the depth of washing and improve coal quality more effectively.

The best choice for coal preparation process

Moving sieve jig

The sieve jigging is different from the widely used sieve jigging. It is suitable for washing lump coal. The sorting efficiency is high, the feed size can reach 300, and the process is simple, the water consumption is very small, and the power is saved. So far, the mobile sieve jigs used in China's coal mines are: the hydraulic type of the German KHD company, the hydraulic type of the Tangshan branch of the Coal Science Research Institute, and the mechanical drive type of the Shenyang Coal Research Institute. Field practice proves that the performance of the three types of process is basically the same. The imperfection I value for characterizing the washing effect is 0.05-0.09, the quantity efficiency is 93.5%-96%, and the water consumption per ton of coal is 0.03-0.08 m3. Each coal preparation plant using a moving sieve jig has obvious economic benefits.

The mechanical dynamic sieve jig that is suitable for the status quo of China's coal mines and has Chinese characteristics has been successfully applied in the mines of Fuxin Badao, Datun Yaoqiao. Practice has proved that the whole machine is simple in structure, easy to grasp and maintain, low in cost, water-saving and power-saving, and processing per ton of raw coal.

The cost of work is about 2 yuan.

On the basis of summarizing the experience of the use of the moving sieve jig for several years, Liaoning Zhongmei Washing Equipment Co., Ltd. has recently launched the DTKJ-LX series of moving sieve jigs, which is a more suitable mechanically driven moving sieve jig. Its main features are:

(1) The transmission device is simple and compact, easy to adjust the working parameters, and the weight is only 1/3 of the current transmission mechanism;

(2) The working parameters can be adjusted within a wide range according to the process requirements, the vibration frequency can be adjusted online, and various options for amplitude and motion cycle characteristics can be provided;

(3) The moving sieve body is equipped with a guide wheel, a buffer damping and an accident limit device, which overcomes the problem of yaw imbalance and is stable and reliable;

(4) The smashing wheel chain is provided with a tensioning device, which can adjust the chain tightness outside the box body, and solve the problem of chain detachment and accident handling;

(5) The floating bucket is durable and reliable, and there will be no leakage and deformation, which can ensure the stable operation of the bed detection system.

In addition, the products of this kind of moving sieve jig (pure coal, vermiculite) can be used according to the site layout requirements, respectively, vertical wheel, bucket elevator or large angle scraper, which is added to the original plant. Extremely important. The technical characteristics of this series of moving sieve jigs are shown in Table 1.

Table 1 Main technical characteristics of DTKJ-LX series moving sieve jig

Modern wind selection method is a practical dry selection process

Compared with wet coal preparation, the advantages of dry coal preparation are obvious: the process is greatly simplified due to a series of complicated processes such as product dehydration and slime treatment, thus saving basic investment and production costs, especially suitable for drought and water shortage. With the needs of the alpine region. The most representative of the dry coal preparation is the wind shaker and the wind jigging. However, in the past, the wind selection method was not taken seriously by the coal preparation industry in China, and it was rarely used. The reason is that the early air sorting machine can only process narrow-level raw materials, and the sorting effect is not good, and the production capacity is low, especially when washing coking coal is dominant, it is difficult to apply. In recent years, the wind selection theory has made a major breakthrough, and the equipment has been improved a lot, and the sorting efficiency has been significantly improved. The modern theory of wind selection is no longer limited by the theory of equal sinking. The equipment used can choose 75-6 (0) mm wide grade coal, even without graded coal (effectively sorting depth 6mm), and the fine particles contained in the material The weighting effect is added to form a gas-solid two-phase mixed medium, thereby enhancing the effect of sorting by density. The new theory not only simplifies the process, but also improves the sorting effect (there are other major improvements in the new air sorter). Due to the lack of strict requirements on the particle size of the human material, the raw coal with 7% external moisture (up to 9% in some cases) can be treated by dry selection. Therefore, in many cases, wind power coal preparation becomes an acceptable processing technology for thermal coal. Because this coal preparation method is invested in provinces, the production cost is low and the effect is quick. Raw coal with an external moisture content of 7% (in some cases up to 9%) can be treated by dry selection. Therefore, in many cases, wind power coal preparation becomes an acceptable processing technology for thermal coal. Because this coal preparation method is invested in provinces, the production cost is low and the effect is quick. At present, there are a large number of applications for the FX and FCX air-selection machines, and the effects are similar. Tables 2 and 3 list the technical specifications of the two air sorters.

At present, there are a large number of applications for the FX and FCX air-selection machines, and the effects are similar. Tables 2 and 3 list the technical specifications of the two air sorters.

Table FX Series Air Separator Specifications

Table 3 FGX series composite fan technical specifications

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