CN112844853A

CN112844853A - Flotation aid and preparation method and application thereof

Info

Publication number: CN112844853A
Application number: CN202110050460.5A
Authority: CN
Inventors: 许海杰; 王萌
Original assignee: Dongying Shengdu Petroleum Technology Co ltd
Current assignee: Dongying Shengdu Petroleum Technology Co ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2021-05-28

Abstract

The invention is applicable to the technical field of coal washing, and provides a flotation aid as well as a preparation method and application thereof, wherein the flotation aid comprises the following components in parts by weight: 5-15 parts of carbon twelve solution, 5-10 parts of octanol residual liquid, 80-90 parts of mixed aromatic hydrocarbon solution and 1-5 parts of active agent. The flotation aid provided by the embodiment of the invention can be used for efficiently washing coal by taking mixed aromatic hydrocarbon, carbon twelve and octanol residual liquid as raw materials so as to improve the yield of clean coal and reduce the ash content of the clean coal.

Description

Flotation aid and preparation method and application thereof

Technical Field

The invention belongs to the technical field of coal washing, and particularly relates to a flotation aid and a preparation method and application thereof.

Background

At present, the raw coal selection rate in China is about 56%. Many unwashed coals directly enter the field of power generation, which brings heavy discharge pressure and pollution control cost to modern power generation technologies.

Coal washing is a source of clean coal, and with the increase of the environmental protection attention of the country and people, the country can require all raw coal to be washed from the legal level, so that the coal flotation industry has a huge growth space in the future.

The China coal processing and utilization society indicates that the total raw coal entering amount reaches 32 hundred million tons in 2020, the entering proportion reaches more than 80 percent, and the entering capacity reaches more than 34 hundred million tons in China. In 2020, the total raw coal input amount in China is increased by more than 7.3 hundred million tons compared with that in 2015, and the average amount of raw coal input is increased by about 1.46 hundred million tons every year.

According to the authority numbers and the actual consumption proportion of the coal washing industry at present, (the consumption of flotation agent for each ton of raw coal in a common coal washing plant is about 1.5 kilograms), the demand of flotation auxiliary agents in China can reach 600 million tons in 2020, and the demand rate is increased at nearly 30 million tons every year, so that the huge total flotation amount of coal and the continuous and stable increase rate can provide wide market space for the research and development of the flotation auxiliary agents and the updating of products.

The most effective separation method for fine-grained coal slime smaller than 0.5mm is a flotation coal separation method. The coal slime flotation is separated according to the difference of the wettability of the surfaces of coal and gangue, and the essence of the flotation is that hydrophobic coal particles are adhered to air bubbles, and hydrophilic gangue particles are retained in coal slurry, so that the separation is realized. The surface of the coal particles is hydrophobic and has natural floatability, the flotation agent mainly plays a role in improving the hydrophobicity of the surface of the coal particles and the firmness of adhesion of the coal particles on bubbles, therefore, the molecular surface of the flotation agent is required to have very strong hydrophobicity, the surfaces of the formed bubbles are also strongly hydrophobic, and in the whole flotation water system, two substances which are hydrophobic at the same time can attract each other, so the hydrophobic coal particles can adhere to the hydrophobic bubbles, and the surfaces of the gangue particles are hydrophilic and naturally stay in the coal slurry, thereby realizing the separation from each other. The method is a basic principle of coal flotation and is also a basis for selecting raw materials when the flotation aid is prepared.

At present, a flotation aid formed by combining mixed aromatic hydrocarbon and kerosene according to a certain proportion is not widely applied to the flotation industry in the last century by western countries, and has the main advantages that the product is relatively short in carbon chain correlation, low in toxicity, high in hydrophobicity, good in selectivity of catching coal particles, capable of being rapidly combined with a foaming agent to complete the flotation process of collecting, floating and defoaming, but the problems of low yield, high ash content and the like of float-separated clean coal still exist.

Disclosure of Invention

The embodiment of the invention aims to provide a flotation aid and aims to solve the problems in the background technology.

The embodiment of the invention is realized in such a way that the flotation aid comprises the following components in parts by weight: 5-15 parts of carbon twelve solution, 5-10 parts of octanol residual liquid, 80-90 parts of mixed aromatic hydrocarbon solution and 1-5 parts of active agent.

It should be noted that, before production, the coal quality of the customer needs to be tested in advance to determine the best production proportioning scheme, and the proportioning amounts of the mixed aromatic hydrocarbon and other components are different for different coal qualities.

As a preferable scheme of the embodiment of the invention, the flotation aid comprises the following components in parts by weight: 8-12 parts of carbon twelve solution, 6-8 parts of octanol residual liquid, 83-87 parts of mixed aromatic hydrocarbon solution and 2-4 parts of active agent.

As another preferable scheme of the embodiment of the invention, the carbon-twelve solution is a byproduct in the production process of octanol, and the carbon chain structure of the carbon-twelve solution comprises a C12 chain.

As another preferable scheme of the embodiment of the invention, the content of the C12 chain in the carbon chain structure of the carbon twelve solution is 65% to 75%.

As another preferable mode of the embodiment of the invention, the octanol residual liquid is a byproduct in the production process of octanol, and the carbon chain structure of the octanol residual liquid contains a C8 chain.

As another preferable scheme of the embodiment of the invention, the content of C8 chains in the carbon chain structure of the octanol residual liquid is 55-65%.

The active agent may be any of conventional active agents such as fatty acids, amines, soaps, polyols, and aminoalcohols, but is not limited thereto.

Another object of an embodiment of the present invention is to provide a method for preparing the flotation aid, which includes the following steps:

weighing the carbon twelve solution, the octanol residual liquid, the mixed aromatic hydrocarbon solution and the active agent according to the weight parts of the components;

mixing the carbon twelve solution and octanol residual liquid to obtain a mixture A;

mixing the mixture A with the mixed aromatic hydrocarbon solution to obtain a mixture B;

and adding an active agent into the mixture B for mixing to obtain the flotation aid.

Another object of the embodiments of the present invention is to provide a flotation aid prepared by the above preparation method.

Another object of an embodiment of the present invention is to provide an application of the flotation aid in coal washing.

As another preferable scheme of the embodiment of the invention, in the coal washing process, the using amount of the flotation auxiliary agent is 80-150 g/t (dry coal slime), and the concentration of the floating coal slurry is 80-100 g/L.

In addition, in the flotation coal washing process, the foam scraping time of the foam scraping plate is recommended to be 2.5-3.5 min, and the air charging amount of the air charging device per unit time is recommended to be 0.2-0.25m³/(m²·min)。

The flotation aid provided by the embodiment of the invention can be used for efficiently washing coal by taking mixed aromatic hydrocarbon, carbon twelve and octanol residual liquid as raw materials, so that the yield of clean coal is improved and the ash content of the clean coal is reduced.

The long-term practical use and research show that the strong and weak collecting effect order of each component of the nonpolar hydrocarbon is as follows: aromatic > alkene > isoparaffin > cycloalkane > normal alkane; heavy aromatics (polycyclic) > light aromatics (monocyclic). The collecting effect of aromatic hydrocarbon and unsaturated hydrocarbon is related to the adsorption capacity of hydrocarbon chemical components on the coal surface, and the size of the adsorption capacity is determined by the distribution property of the electron density around rings and chains in each hydrocarbon molecule. Saturated hydrocarbons have a symmetrical electron shell with only carbon-hydrogen bonds in the molecule and no concentrated electron cloud around it; the aromatic hydrocarbon molecules are linked in a ring, the olefin molecules have hydrocarbon double bonds, and the electron cloud density of the hydrocarbon double bonds is larger, so that the bonds adsorbed by unsaturated hydrocarbons (aromatic hydrocarbon and olefin) on the surface of coal particles are larger than those adsorbed by saturated hydrocarbons (naphthenic hydrocarbon and alkane).

The other reason that the aromatic hydrocarbon components have higher activity is that the oil-water interfacial tension of the aromatic hydrocarbon components is lower, the dispersion degree is better under the same other conditions, and the aromatic hydrocarbon components are easier to emulsify into small oil drops and fix on the surface of coal particles in the flotation process, so that the hydrophobicity of the coal particles is improved.

In the invention, the carbon chain of the mixed aromatic hydrocarbon is relatively long, the mixed aromatic hydrocarbon is typical unsaturated hydrocarbon, is more economic than kerosene, has strong collecting force in the flotation process, and has great popularization and use values.

The carbon-twelve solution is a byproduct in the production process of octanol, a carbon 12 chain is taken as a main carbon chain structure, and other components are other miscellaneous chain organic substances with similar carbon chains, so the byproduct is also called carbon-twelve, and through extensive experiments and practical verification of coal washery, foam generated in the flotation process of carbon-twelve has a compact structure, a small bubble diameter and viscous foam, and is very favorable for improving the yield of flotation clean coal after being matched with mixed aromatic hydrocarbon of unsaturated hydrocarbon, so the carbon-twelve solution is widely applied to flotation of copper, tungsten, gold, rare earth and other ores at home and abroad.

Octanol residual liquid is a byproduct in the octanol production process, a C8 chain is taken as a main component in a carbon chain structure of a product, the other components in the residual liquid are similar components of a C5-C12 chain, and because the carbon chain is relatively short and the solubility of water is relatively high, the foaming speed is high in the flotation process, the foam structure is loose, the bubble diameter is large, the foam is brittle, the bubble service life is short and cannot be durable, a foaming agent must be added repeatedly to maintain the foaming effect, and after the octanol residual liquid is matched with mixed aromatic hydrocarbon of unsaturated hydrocarbon, high-ash fine mud entrainment can be well avoided, so that the quality of clean coal is greatly improved. Therefore, the octanol residual liquid mainly containing short chain and the long chain are mainly supplemented with each other by twelve carbon atoms, and the twelve carbon atoms and the octanol residual liquid are byproducts in the octanol chemical production process, so the method has high cost performance, is economical and practical, and has high practical value.

In the coal slime flotation process, factors influencing the floatability of the coal slime are very complex, and not only contain the own floating characteristic of the coal quality, but also have the influence of various process conditions in the flotation process. In order to obtain better technical indexes, the flotation can be carried out by using mixed aromatic hydrocarbon, carbon twelve and octanol residual liquid and also using proper regulators, activators and the like in a matching way if necessary.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The embodiment provides a flotation aid, and the preparation method comprises the following steps:

s1, weighing 5g of carbon twelve solution, 5g of octanol residual liquid, 90g of mixed aromatic hydrocarbon solution and 1g of active agent; wherein, the carbon twelve solution is a byproduct in the octanol production process, and the content of C12 chain in the carbon chain structure is 65%; the octanol residual liquid is a byproduct in the octanol production process, and the content of C8 chain in the carbon chain structure is 55%.

And S2, mixing the carbon twelve solution and the octanol residual liquid, and stirring for 20 minutes at normal temperature to obtain a mixture A.

And S3, mixing the mixture A with a mixed aromatic hydrocarbon solution to obtain a mixture B.

And S4, adding an active agent into the mixture B, mixing, stirring at normal temperature for 30 minutes, sampling, inspecting, and detecting at least three samples of the top of the tank, the middle of the tank and the bottom of the tank to obtain a finished product of the flotation aid after the finished product is qualified.

Example 2

s1, weighing 15g of carbon twelve solution, 10g of octanol residual liquid, 80g of mixed aromatic hydrocarbon solution and 5g of active agent; wherein, the carbon twelve solution is a byproduct in the production process of octanol, and the content of C12 chain in the carbon chain structure is 75 percent; the octanol residual liquid is a byproduct in the octanol production process, and the content of C8 chain in the carbon chain structure is 65%.

And S2, mixing the carbon twelve solution and the octanol residual liquid, and stirring for 40 minutes at normal temperature to obtain a mixture A.

And S4, adding an active agent into the mixture B, mixing, stirring at normal temperature for 40 minutes, sampling, inspecting, and detecting at least three samples of the top of the tank, the middle of the tank and the bottom of the tank to obtain a finished product of the flotation aid after the finished product is qualified.

Example 3

s1, weighing 6g of carbon twelve solution, 9g of octanol residual liquid, 85g of mixed aromatic hydrocarbon solution and 2g of active agent; wherein, the carbon twelve solution is a byproduct in the octanol production process, and the content of C12 chain in the carbon chain structure is 68%; the octanol residual liquid is a byproduct in the octanol production process, and the content of C8 chain in the carbon chain structure is 58%.

And S2, mixing the carbon twelve solution and the octanol residual liquid, and stirring for 25 minutes at normal temperature to obtain a mixture A.

And S4, adding an active agent into the mixture B, mixing, stirring at normal temperature for 35 minutes, sampling, inspecting, and detecting at least three samples of the top of the tank, the middle of the tank and the bottom of the tank to obtain a finished product of the flotation aid after the finished product is qualified.

Example 4

s1, weighing 13g of carbon twelve solution, 6g of octanol residual liquid, 81g of mixed aromatic hydrocarbon solution and 4g of active agent; wherein, the carbon twelve solution is a byproduct in the production process of octanol, and the content of C12 chain in the carbon chain structure is 72 percent; the octanol residual liquid is a byproduct in the octanol production process, and the content of C8 chain in the carbon chain structure is 62%.

And S2, mixing the carbon twelve solution and the octanol residual liquid, and stirring at normal temperature for 20-40 minutes to obtain a mixture A.

And S4, adding an active agent into the mixture B, mixing, placing at normal temperature, stirring for 30-40 minutes, sampling, inspecting, detecting at least three samples of the top of the tank, the middle of the tank and the bottom of the tank, and obtaining a finished product of the flotation aid after the samples are qualified.

Example 5

s1, weighing 8g of carbon twelve solution, 6g of octanol residual liquid, 87g of mixed aromatic hydrocarbon solution and 2g of active agent; wherein, the carbon twelve solution is a byproduct in the production process of octanol, and the content of C12 chain in the carbon chain structure is 70%; the octanol residual liquid is a byproduct in the octanol production process, and the content of C8 chain in the carbon chain structure is 60%.

And S2, mixing the carbon twelve solution and the octanol residual liquid, and stirring for 30 minutes at normal temperature to obtain a mixture A.

Example 6

s1, weighing 12g of carbon twelve solution, 8g of octanol residual liquid, 83g of mixed aromatic hydrocarbon solution and 4g of active agent; wherein, the carbon twelve solution is a byproduct in the production process of octanol, and the content of C12 chain in the carbon chain structure is 70%; the octanol residual liquid is a byproduct in the octanol production process, and the content of C8 chain in the carbon chain structure is 60%.

Example 7

s1, weighing 10g of carbon twelve solution, 7g of octanol residual liquid, 85g of mixed aromatic hydrocarbon solution and 3g of active agent; wherein, the carbon twelve solution is a byproduct in the production process of octanol, and the content of C12 chain in the carbon chain structure is 70%; the octanol residual liquid is a byproduct in the octanol production process, and the content of C8 chain in the carbon chain structure is 60%.

The flotation aid prepared in the embodiment is fireproof and moistureproof in use, transportation and storage, and solarization and impact are strictly prohibited; the environment-friendly fireproof paint can be stored in cool, ventilated and dry places, and is careful to prevent fire and toxic substances and other strong acid and alkali substances from being mixed; the flotation aid has the validity period of 2 years from the production date.

In addition, the flotation aid prepared in the above embodiment can be applied to flotation coal washing, and the application method comprises the following steps:

1. the input mode is different according to different flotation processes and equipment, and the invention takes a mechanical stirring type flotation process as an example. The chemical feeding tank is installed at the top of the mechanical stirring barrel, meanwhile, the flow control valve is installed at the bottom of the chemical feeding tank, chemical feeding amount is controlled according to concentration of flotation feeding materials, and when flotation media change, adjustment of the chemical feeding amount is carried out by paying attention to detected amount of concentrate and tailings in time.

2. In the flotation process, the recommended dosage of the flotation auxiliary agent is 80-150 g/t (dry coal slime), the concentration of the float coal slurry is recommended to be 80-100 g/L, and if the coal slime is difficult to float coal, the concentration of the coal slurry can be properly reduced.

3. In the flotation process, the recommended foam scraping time of the foam scraping plate is 2.5-3.5 min, and the air inflation quantity of the air inflation device per unit time is 0.2-0.25m³/(m²·min)。

The performance indexes of the flotation aid prepared in the above example are shown in table 1:

TABLE 1

Item	Performance index
		Yield of clean coal	≥80%
Clean coal ash content	≤12%
		Ash content of tail coal	≥45%
Appearance of the product	Homogeneous liquid without mechanical impurities
		Density (20 ℃ C.), g/cm³	0.85~0.95
Solubility in water	Is insoluble in water

As can be seen from table 1, the flotation aid provided in the embodiment of the present invention can be used for efficient coal washing by using mixed aromatic hydrocarbon, carbon twelve and octanol residual liquid as raw materials, so as to increase the yield of clean coal and reduce the ash content of the clean coal.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The flotation aid is characterized by comprising the following components in parts by weight: 5-15 parts of carbon twelve solution, 5-10 parts of octanol residual liquid, 80-90 parts of mixed aromatic hydrocarbon solution and 1-5 parts of active agent.

2. A flotation aid according to claim 1, wherein the flotation aid comprises the following components in parts by weight: 8-12 parts of carbon twelve solution, 6-8 parts of octanol residual liquid, 83-87 parts of mixed aromatic hydrocarbon solution and 2-4 parts of active agent.

3. A flotation aid according to claim 1 or 2, wherein the solution of carbon twelve is a by-product of octanol production, the carbon chain structure of which comprises C12 chains.

4. A flotation aid according to claim 3, wherein the carbon chain structure of the twelve carbon solution contains 65% to 75% C12 chains.

5. A flotation aid according to claim 1 or 2, wherein said octanol raffinate is a byproduct of octanol production, and its carbon chain structure contains C8 chain.

6. A flotation aid according to claim 5, wherein the C8 chain content in the carbon chain structure of the octanol raffinate is 55% to 65%.

7. A method of preparing a flotation aid according to any one of claims 1 to 6, comprising the steps of:

8. A flotation aid prepared by the method of claim 7.

9. Use of the flotation aid according to any one of claims 1 to 6 and 8 in coal washing.

10. The application of the flotation aid in coal washing according to claim 9, wherein in the coal washing process, the dosage of the flotation aid is 80-150 g/t (dry coal slime), and the concentration of floating coal slurry is 80-100 g/L.