Coal slime filtration-aiding dehydration treatment process and dosing method

Abstract

The invention discloses a coal slime filtration-aiding dehydration treatment process and a dosing method, and relates to the technical field of mine coal slime water treatment. The method comprises the following steps: S1, first-stage concentration tank treatment; S2, second-stage concentration tank treatment; and S3, stirring and filter pressing treatment. According to the invention, the synergistic effect of the high-molecular polymer and the surfactant and the adding mode of the medicament are adopted, the high-molecular polymer flocculates the coal slime particles into larger particles in the initial stage, and the addition of the surfactant further increases and stabilizes the floc, so that the floc is easier to dehydrate in the filter pressing process; the synergistic mechanism improves the overall efficiency of coal slime dehydration and reduces the treatment cost, through the synergistic effect of the high-molecular polymer and the surfactant, the process greatly improves the dehydration efficiency of the coal slime water and reduces the water content of a filter cake, and a dosing system can accurately adjust the dosage of a medicament according to the concentration and flow of the coal slime water, so that the treatment cost is reduced. Excessive or insufficient dosing is avoided, so that the dehydration effect is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of mine coal slime water treatment, in particular to a coal slime filtration-aided dehydration treatment process and a dosing method. Background Art

[0002] With the development of my country's coal industry, a large amount of coal slime water is produced during the coal washing and processing. The coal slime water contains a large amount of fine particles and suspended matter that is difficult to settle, which not only affects the reuse of coal slime water, but also increases the difficulty of wastewater treatment. In order to improve the dehydration efficiency and resource utilization rate of coal slime water, various filter aids are widely used to improve the filtration effect;

[0003] However, most of the filter aids currently used in the market are single components, which are limited in their specificity and cannot comprehensively improve the filtration performance of coal slime water. Especially when treating complex coal slime water, there are problems such as slow filtration speed, high moisture content of filter cake, and uneven reagent addition;

[0004] In order to overcome these problems, composite filter aids have gradually attracted attention. By combining multiple functional components, they can not only promote the sedimentation and filtration of particulate matter in coal slime water, but also effectively reduce the moisture content of filter cakes, further improving the efficiency of coal slime water treatment.

[0005] However, in the process of treatment, the traditional agent dosing system generally has the following problems:

[0006] 1. Uneven addition of reagents: During the treatment of coal slurry water, the filter aid and coal slurry water are not mixed sufficiently, resulting in unsatisfactory effect of the reagents and affecting the filtration efficiency;

[0007] 2. It is difficult to accurately control the dosage, resulting in excessive or insufficient filter aid, which leads to poor flocculation effect;

[0008] In view of the above problems, the inventors proposed a coal slime filtration-aided dehydration treatment process and a dosing method to solve the above problems. Summary of the invention

[0009] In order to solve the above problems, the purpose of the present invention is to provide a coal slime filtration and dehydration treatment process and a dosing method.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solution: a coal slime filtration and dehydration treatment process, comprising the following steps:

[0011] S1, first stage thickening tank treatment

[0012] The coal slurry water is introduced into a thickening tank for concentration and sedimentation. The high molecular polymer is evenly added at the tail end of the feed pipe through a three-point dosing system. The three dosing points are 0.5m apart, and a vent pipe is opened on the feed pipe 0.5m before the dosing point to ensure that the flocculant enters the coal slurry water flow smoothly.

[0013] S2, second stage thickening tank treatment

[0014] The overflow liquid from the first stage thickener is introduced into the second stage thickener, and high molecular polymer is evenly added at the tail end of the feed pipe of the second stage thickener through a three-point dosing system to further improve the flocculation effect;

[0015] S3, stirring and filter pressing

[0016] The bottom flow of the first and second stage thickening tanks is transported to the coal slime mixing barrel, and the surfactant is accurately added into the feed pipe through the dosing system. After the coal slime water and the surfactant in the mixing barrel are fully mixed, they enter the filter press for dehydration treatment.

[0017] Preferably, the high molecular polymer acts as both a flocculant and a filter aid, thereby improving the dewatering efficiency of the coal slime by enhancing floc formation and filter aid effects.

[0018] The present invention also provides a method for adding medicine in a coal slime filtration-aided dehydration treatment process, comprising the following steps:

[0019] A1. Mixing of reagent and coal slime water

[0020] The surfactant is fully mixed with the concentrated coal slime water in a stirring barrel to further increase and stabilize the size of the flocs to improve the filter press dewatering performance;

[0021] A2. Configure dosing metering pump

[0022] The dosing metering pumps for the polymer and surfactant are installed on the connecting pipe between the dosing tank and the coal slime transport pipe, and the dosage of the reagents is accurately controlled by the dosing metering pumps, and the dosage is adjusted according to the concentration and flow rate of the coal slime water to ensure the accuracy and effectiveness of the dosing process;

[0023] A3. Use three-point dosing method

[0024] The dosing system adopts a three-point dosing method, which can ensure that the reagent is evenly distributed in the feed pipe, reduce reagent waste, and improve the contact efficiency between the flocculant and the coal slime water;

[0025] A4. Configure the vent pipe

[0026] A vent pipe is arranged in the dosing system, and the vent pipe can eliminate the air resistance in the feed pipe, ensure that the reagent flows smoothly into the coal slurry water, and improve the dosing efficiency.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. In the present invention, the synergistic effect of high molecular polymer and surfactant and the addition method of reagent are adopted. The high molecular polymer flocculates the coal slime particles into larger particles in the initial stage, and the addition of surfactant further enlarges and stabilizes the flocs, making it easier to dehydrate during the filter pressing process. This synergistic mechanism improves the overall efficiency of coal slime dehydration and reduces the processing cost;

[0029] 2. In the present invention, through the synergistic effect of high molecular polymer and surfactant, the process greatly improves the dehydration efficiency of coal sludge water and reduces the moisture content of filter cake;

[0030] 3. In the present invention, the dosing system can accurately adjust the dosage of the agent according to the concentration and flow rate of the coal slime water, avoiding excessive or insufficient dosing, thereby optimizing the dehydration effect;

[0031] 4. In the present invention, by reasonably setting the three-point dosing method, it is ensured that the reagent and the coal slurry are fully mixed, the reagent waste is reduced, and the treatment cost is reduced;

[0032] 5. In the present invention, through the process of S1-S3, this process is simple and efficient, suitable for large-scale coal slime water treatment systems, can improve the overall treatment efficiency, and meet the needs of industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 The present invention is a schematic diagram of a process for the dehydration treatment of coal slime by aiding filtration.

[0035] Figure 2 It is a schematic diagram of a dosing method for a coal slime filtration-aided dehydration treatment process of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1: Figure 1-2 As shown, a coal slime filtration aid dehydration treatment process is used to dehydrate coal slime water with a solid content of 5%, comprising the following steps:

[0038] S1, first stage thickening tank treatment

[0039] The coal slurry water is introduced into a thickening tank. A three-point dosing system is set at the tail end of the feed pipe. A high molecular polymer with a concentration of 0.1% is added through a dosing metering pump at three dosing points 0.5m away from the end of the pipe to ensure effective flocculation of particles in the coal slurry water. To ensure that the flocculant enters the coal slurry water smoothly, an air vent is opened on the feed pipe 0.5m before the dosing point to eliminate air resistance in the pipe and promote self-flow dosing of the flocculant;

[0040] S2, second stage thickening tank treatment

[0041] The overflow of the first thickening tank enters the second thickening tank, and 0.05% of high molecular polymer is added in sequence through the three-point dosing system. The reagent is gradually added to ensure the formation and stability of flocculants in the coal sludge water, further improving the flocculation effect;

[0042] S3, stirring and filter pressing

[0043] The bottom flow coal sludge from the first and second stage thickening tanks enters the mixing barrel. In the feeding pipe of the mixing barrel, 0.02% surfactant is added through the dosing metering pump to ensure that the surfactant is fully mixed with the coal sludge water to increase the size and stability of the flocs. Then the evenly stirred coal sludge water is sent to the filter press for dehydration treatment;

[0044] Experimental results: The moisture content of the treated coal slime filter cake dropped from 30% to 25%, indicating that the process significantly improved the dehydration effect of coal slime.

[0045] Embodiment 2: A coal slime filtration aid dehydration treatment process, dehydrating 300,000 tons of dry coal slime, the content of dry coal slime accounts for more than 30% of the raw coal to be washed, and the fine particle content is relatively high, and the content of particle size <0.074mm accounts for about 70%-90% of coal slime water, comprising the following steps:

[0046] S1, one-stage thickening tank treatment

[0047] The coal slurry enters a thickening tank through a conveying pipeline. A three-point dosing system is used at the tail end of the feed pipe. Three dosing points are set at a spacing of 0.5m. 0.12% of high molecular polymer is added in sequence to ensure that the flocculant is evenly distributed in the coal slurry flow and effectively flocculates. To ensure smooth dosing, an air vent is installed on the feed pipe 0.5m before the dosing point to eliminate air resistance;

[0048] S2, second stage thickening tank treatment

[0049] The overflow of the first thickening tank enters the second thickening tank, and the three-point dosing system is used to add 0.08% of high molecular polymer to further enhance the flocculation effect. This step ensures that the suspended particles in the coal slime water are further condensed to form larger flocs.

[0050] S3, stirring and filter pressing

[0051] The underflow coal slime from the first and second stage thickening tanks is introduced into the mixing barrel, and 0.04% surfactant is added to the feed pipe. The coal slime and the surfactant are fully mixed by stirring, and then the evenly mixed coal slime water is transported to the filter press for dehydration treatment;

[0052] Treatment results: The moisture content of the treated coal slime filter cake was reduced from 40% to 28%, the coal slime dehydration efficiency was significantly improved, the amount of reagents used was effectively controlled, the process operation was stable and reliable, the treatment cost of coal slime water was reduced and the production environment was improved;

[0053] Embodiment 3: A coal slime filtration-aided dehydration treatment process for treating low-concentration coal slime water, wherein the solid content of the coal slime water is 3%, comprising the following steps:

[0054] S1, one-stage thickening tank treatment

[0055] The low-concentration coal slurry water is introduced into a thickening tank. A three-point dosing system is set at the tail end of the feed pipe. Each point is 0.5m apart. A high molecular polymer with a concentration of 0.08% is added. In order to ensure that the flocculant enters the coal slurry water smoothly, a vent pipe is installed on the feed pipe 0.5m before the dosing point to remove the air in the pipe.

[0056] S2, second stage thickening tank treatment

[0057] The overflow from the first thickener enters the second thickener, where 0.05% of high molecular polymer is added in sequence through the three-point dosing method. This step ensures further flocculation of finer particles in the coal slurry water.

[0058] S3, stirring and filter pressing

[0059] The bottom flow coal slurry from the first and second stage thickening tanks enters the mixing barrel, and 0.01% surfactant is added to the feeding pipe of the mixing barrel to ensure that the coal slurry water and the surfactant are fully mixed. After stirring evenly, the coal slurry water is sent to the filter press for dehydration;

[0060] Treatment results: After treatment, the moisture content of the filter cake was reduced from the original 35% to 27%, and the separation effect of the coal slime was significantly improved. In the treatment of low-concentration coal slime water, the process showed excellent dehydration efficiency and saved the dosage of reagents.

[0061] Embodiment 4: A coal slime filtration-aided dehydration treatment process for treating high-concentration coal slime water with a solid content of 8% and a total treatment capacity of 100 tons / hour, comprising the following steps:

[0062] S1, first stage thickening tank treatment

[0063] The high-concentration coal slurry water is introduced into a first-stage thickening tank. Due to the high solid content, a high molecular polymer with a concentration of 0.15% is added at the tail end of the feed pipe through a three-point dosing system to ensure that the coal slurry particles can quickly flocculate to form large particle flocs. An air release pipe is installed on the feed pipe 0.5m before each dosing point to eliminate air resistance;

[0064] S2, Second stage thickening tank treatment

[0065] The overflow from the first stage thickening tank enters the second stage thickening tank, where 0.1% of high molecular polymer is added in sequence through a three-point dosing system to further enhance the flocculation effect and promote the sedimentation of fine suspended particles.

[0066] S3, stirring and filter pressing

[0067] The concentrated underflow coal slime enters the mixing barrel, and 0.03% surfactant is added to the feeding pipe of the mixing barrel through a dosing metering pump. The surfactant is fully mixed with the concentrated coal slime water, and after being stirred evenly, it is sent to the filter press for dehydration treatment;

[0068] Treatment results: The moisture content of the treated coal slime filter cake dropped from 32% to 23%, and the dehydration efficiency was greatly improved. This process is particularly suitable for the treatment of high-concentration coal slime water, ensuring the flocculation efficiency and significantly improving the effect of filter press dehydration.

[0069] The above embodiments all optimize the dewatering performance of coal slime through the synergistic effect of high molecular polymer and surfactant, and adapt to the processing requirements under different concentration conditions.

[0070] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A coal slime filtration and dehydration treatment process, characterized in that: The following steps are involved: S1, first stage thickening tank treatment The coal slurry water is introduced into a thickening tank for concentration and sedimentation. The high molecular polymer is evenly added at the tail end of the feed pipe through a three-point dosing system. The three dosing points are 0.5m apart, and a vent pipe is opened on the feed pipe 0.5m before the dosing point to ensure that the flocculant enters the coal slurry water flow smoothly. S2, Second stage thickening tank treatment The overflow liquid from the first stage thickener is introduced into the second stage thickener, and high molecular polymer is evenly added at the tail end of the feed pipe of the second stage thickener through a three-point dosing system to further improve the flocculation effect; S3, stirring and filter pressing The bottom flow of the first and second stage thickening tanks is transported to the coal slime mixing barrel, and the surfactant is accurately added into the feed pipe through the dosing system. After the coal slime water and the surfactant in the mixing barrel are fully mixed, they enter the filter press for dehydration treatment.

2. A coal slime filtration and dehydration treatment process as claimed in claim 1, characterized in that: The high molecular polymer acts as both a flocculant and a filter aid, and improves the dewatering efficiency of the coal slime by enhancing floc formation and filter aid effects.

3. A dosing method applied to the coal slime filtration and dehydration treatment process according to any one of claims 1 to 2, characterized in that: The following steps are involved: A1. Mixing of reagent and coal slime water The surfactant is fully mixed with the concentrated coal slime water in a stirring barrel to further increase and stabilize the size of the flocs to improve the filter press dewatering performance; A2. Configure dosing metering pump The dosing metering pumps for the polymer and surfactant are installed on the connecting pipe between the dosing tank and the coal slime transport pipe, and the dosage of the reagents is accurately controlled by the dosing metering pumps, and the dosage is adjusted according to the concentration and flow rate of the coal slime water to ensure the accuracy and effectiveness of the dosing process; A3. Use three-point dosing method The dosing system adopts a three-point dosing method, which can ensure that the reagent is evenly distributed in the feed pipe, reduce reagent waste, and improve the contact efficiency between the flocculant and the coal slime water; A4. Configure the vent pipe A vent pipe is arranged in the dosing system, and the vent pipe can eliminate the air resistance in the feed pipe, ensure that the reagent flows smoothly into the coal slurry water, and improve the dosing efficiency.

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