Efficient solid-water separating agent and method for coal washing water

Abstract

The invention discloses a coal washing water efficient solid-water separating agent and method, and belongs to the technical field of coal washing water treatment. The solid-water separation agent comprises a solid-water separation agent A and a solid-water separation agent B. The solid-water separation agent A comprises 20% by mass of poly dimethyl diallyl ammonium chloride with the effective content of 40%; the mass fraction of polyaluminum chloride with the effective content of 10% is 20%; the effective content of the polyferric trichloride is 30%, and the mass fraction is 5%. The solid-water separating agent B comprises polyacrylamide, and the mass fraction of the polyacrylamide is 45%; magnesium chloride with a mass fraction of 25%; magnesium chloride with a mass fraction of 15%; sodium sulfate with a mass fraction of 10%; and isopropanol with a mass fraction of 5%. Rapid separation of coal washing water solid-water can be achieved, and the dosage of the coal washing water solid-water separating agent A is 7-20 g, and the dosage of the coal washing water solid-water separating agent B is 2-8 g. The efficient solid-water separating agent for coal washing water has the advantages of being small in dosage, fast in solid-water separation, short in separation time, high in separation efficiency, clear in upper-layer water after precipitation, good in water recycling effect and the like.

Description

Technical Field

[0001] The invention relates to a high-efficiency solid-water separation agent and method for coal washing water, belonging to the technical field of coal washing water treatment. Background Art

[0002] A large amount of wastewater generated during coal mining and wet washing contains a large amount of suspended matter, the main components of which are fine-grained coal dust and fine mineral powder. Coal washing water needs to be treated to separate the suspended matter before it can meet the discharge standard or be recycled. However, the nature of coal washing wastewater is very complex, with the properties of suspension and colloid, and it is difficult to clarify naturally. At present, flocculants and coagulants such as polyaluminium chloride and polyacrylamide need to be added to the coal washing water to flocculate and precipitate the extremely fine particles to achieve the purpose of solid-water separation of coal washing water. However, the current dosage of the added agent is large and the cost is high; the solid-water separation time is long and the efficiency is low; the supernatant after separation has high turbidity and is not clear, making it difficult to reuse or discharge. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a high-efficiency solid-water separation agent and method for coal washing water.

[0004] The technical solution of the present invention is:

[0005] A high-efficiency solid-water separation agent and method for coal washing water, characterized in that it is mainly made of the following components:

[0006] Polydimethyldiallylammonium chloride with an effective content of 40%, polyaluminium chloride with a mass fraction of 20% and an effective content of 10%, polyferric chloride with a mass fraction of 20% and an effective content of 30%, and a mass fraction of 5%;

[0007] Polyacrylamide, mass fraction is 45%, magnesium chloride, mass fraction is 25%, magnesium chloride, mass fraction is 15%, sodium sulfate, mass fraction is 10%, isopropanol, mass fraction is 5%;

[0008] The application method has the following steps:

[0009] Step 1: Take polydimethyldiallylammonium chloride with an effective content of 40%, polyaluminium chloride with a mass fraction of 20% and an effective content of 10%, and polyferric chloride with a mass fraction of 20% and an effective content of 30%, and mix them with a mass fraction of 5% to obtain a solid-water separation agent A;

[0010] Step 2: Take polyacrylamide, with a mass fraction of 45%, magnesium chloride, with a mass fraction of 25%, magnesium chloride, with a mass fraction of 15%, sodium sulfate, with a mass fraction of 10%, and isopropanol, with a mass fraction of 5%, and mix them to obtain a solid-water separation agent B;

[0011] Step 3: Add reinforcement-water separation agent A to the coal washing water to mix it thoroughly;

[0012] Step 4: Post-injection reinforcement-water separation agent B.

[0013] The beneficial effects of the present invention are as follows: compared with the prior art, the high-efficiency solid-water separator for coal washing water of the present invention has the advantages of small dosage, fast solid-water separation, short separation time, high separation efficiency, clear upper layer water after precipitation, good reuse water effect, etc. DETAILED DESCRIPTION

[0014] The specific implementation modes of the present invention are further described below in conjunction with the embodiments.

[0015] Example 1

[0016] The daily water treatment capacity of a coal washing plant is about 640t / d, the daily treatment time is 8h, 80t / h.

[0017] Preparation method of medicine:

[0018] (1) Add 4 kg of reinforcement-water separation agent A to the No. 1 medicine tank, add water (tap water / recycled water) to make the volume to 0.4 m3, and stir and dilute for 5 minutes.

[0019] (2) Add 3 kg of reinforcement-water separation agent B into the No. 2 medicine tank, add water (tap water / recycled water) to make the volume up to 3 m3, and stir and dilute for 10 minutes.

[0020] Dosing of reagents:

[0021] (1) When the solids in the concentration tank are completely settled and the upper water is clear, adjust the valves of No. 1 and No. 2 medicine tanks to control the flow rate and use a measuring cup to test the flow to determine the flow rate.

[0022] (2) During the actual operation of 5 hours, the dosage of solid-water separator A was about 3 kg, the dosage of solid-water separator B was about 1.2 kg, and the total water volume treated was about 400 t.

[0023] (3) Dosage per ton of water: about 7.5g of solid-water separator A and about 3g of solid-water separator B. The mass ratio of solid-water separator A to solid-water separator B is 7.5 to 3.

[0024] Effect analysis

[0025] Compared with the prior art, the coal washing water treatment agent of the present invention can not only achieve the effects of the prior art, such as effectively flocculating and settling the suspended coal, greatly reducing the coal-water separation time, and the sediment is loose and uniform, does not agglomerate, and is not easy to compact, but also can increase the output of filter press dry mud cake.

[0026] Economic Analysis

[0027] The original reagent costs about 0.2 to 0.3 yuan per ton of water, and the improved reagent costs about 0.1 to 0.2 yuan per ton of water. It can be seen that the efficient solid-water separator for coal washing water provided by the present invention can save more than 40% of the cost compared with traditional flocculants.

Claims

1. A coal washing water high-efficiency solid-water separation agent and method, characterized in that: It is mainly made of the following components: Polydimethyldiallylammonium chloride with an effective content of 40%, polyaluminium chloride with a mass fraction of 20% and an effective content of 10%, polyferric chloride with a mass fraction of 20% and an effective content of 30%, and a mass fraction of 5%; Polyacrylamide, mass fraction is 45%, magnesium chloride, mass fraction is 25%, magnesium chloride, mass fraction is 15%, sodium sulfate, mass fraction is 10%, isopropanol, mass fraction is 5%.

2. The high-efficiency solid-water separation agent for coal washing water according to claim 1, characterized in that: The application method has the following steps: Step 1: Take polydimethyldiallylammonium chloride with an effective content of 40%, polyaluminium chloride with a mass fraction of 20% and an effective content of 10%, and polyferric chloride with a mass fraction of 20% and an effective content of 30%, and mix them with a mass fraction of 5% to obtain a solid-water separation agent A; Step 2: Take polyacrylamide, with a mass fraction of 45%, magnesium chloride, with a mass fraction of 25%, magnesium chloride, with a mass fraction of 15%, sodium sulfate, with a mass fraction of 10%, and isopropanol, with a mass fraction of 5%, and mix them to obtain a solid-water separation agent B; Step 3: Add reinforcement-water separation agent A to the coal washing water to mix it thoroughly; Step 4: Post-injection reinforcement-water separation agent B.