CN108636615A - A kind of Fine Coal Flotation collecting agent preparation method - Google Patents

Abstract

A kind of Fine Coal Flotation collecting agent preparation method belongs to coal flotation pharmaceutical techniques field.Flotation collector preparation method, steps are as follows：(1) candle ash is prepared：4 candle flame top portion thereof 250ml beaker so that flame imperfect combustion, cigarette ash are attached to beaker inner wall, until beaker inner wall has coating of wax candle ash, prepare and complete, collect spare；(2) candle ash prepared by step (1) is taken into 1g, is added in the non-polar hydrocarbon oil of 120 180ml, 24 48h is stood after mixing；Obtain flotation collector.The candle ash prepared by adding a kind of imperfect combustion by candle in non-polar hydrocarbon oil, contributes to the rupture of mineral surfaces hydration shell and the dispersion of oil droplet, to be obviously improved the flotation recovering effect of coal slime in floatation process.Advantage：The more traditional non-polar hydrocarbon oil collecting agent of flotation collector contributes to the dispersion of the rupture and oil droplet of mineral surfaces hydration shell in floatation process, improves coal grain hydrophobicity, hence it is evident that improve the flotation recovering effect of coal slime.

Description

A kind of preparation method of fine-grained coal flotation collector

technical field

The invention relates to the technical field of coal flotation agents, in particular to a method for preparing fine coal flotation collectors.

Background technique

Coal is the most important fossil energy in my country, and its dominant position in the primary energy consumption structure will not change for a long time in the future. Coal is a mixture of organic and inorganic materials and therefore needs to be sorted before use. With the rapid development of the national economy, the demand for energy continues to increase, and coals with medium and high metamorphic degrees are mined in large quantities, and their reserves are decreasing day by day. Not well utilized.

High-efficiency coal sorting technology is an important prerequisite for realizing clean and efficient utilization of coal resources. Among them, flotation is currently the most mature and effective method for sorting coal smaller than 0.5mm, and is widely used in industrial production. In flotation, fine coal (<0.5mm) is separated using a flotation machine. In general, coal is naturally hydrophobic, but this degree of hydrophobicity is not sufficient for effective flotation, and non-polar hydrocarbon oils such as diesel and kerosene are usually required as collectors to further improve the floatability of coal particles.

However, for difficult-to-float coals such as low-rank coal and oxidized coal, the surface often contains a large number of oxygen-containing functional groups, which are highly hydrophilic and poor in floatability. Ground flotation, and poor selectivity. In order to solve this technical problem, the current research is mainly focused on the development of efficient flotation reagents or reagent combination methods, surface modification, etc. to improve the hydrophobicity and selectivity of the difficult-to-float coal surface. Specifically, it includes adding various surfactants during the flotation process, ore grinding pretreatment, heating and pressure pretreatment, microwave or ultrasonic pretreatment, high-shear pulping and other technical means. Although the above means can improve the flotation effect of difficult-to-float coal, the cost of surface modification is high and it is difficult to industrialize. Secondly, current research mainly focuses on reducing the number of oxygen-containing functional groups on the coal surface and increasing its hydrophobicity, thereby improving its flotation effect. However, in the flotation process of difficult-to-float slime, the foam stability is poor, and the amount of solids carried by the foam is small, resulting in low yield of clean coal products, which has not been paid enough attention. Therefore, the development of a preparation method for a new agent that improves the flotation recovery effect of coal slime will provide a new idea for improving the flotation recovery effect of coal slime.

Contents of the invention

The purpose of the present invention is to provide a fine-grained coal flotation collector preparation method to solve the problem of poor recovery effect of non-polar hydrocarbon oil in coal slime flotation recovery clean coal flotation recovery.

The object of the present invention is achieved like this: the preparation method of flotation collector, step is as follows:

(1) Preparation of candle ashes: Invert 250ml beakers on the top of the 4 candle flames so that the flames do not burn completely, and the soot adheres to the inner wall of the beaker until there is a layer of candle ashes on the inner wall of the beaker. After the preparation is completed, collect it for later use;

(2) Take 1 g of the candle ash prepared in step (1), add it to 120-180 ml of non-polar hydrocarbon oil, mix it and let it stand for 24-48 hours; the flotation collector is obtained.

The non-polar hydrocarbon oil includes: any one of kerosene, modified kerosene, diesel oil, fuel oil, natural gas condensate oil or n-dodecane.

Beneficial effect, due to the above scheme, by adding a kind of candle ashes prepared by incomplete combustion of candles in non-polar hydrocarbon oils, it helps the rupture of the hydration film on the mineral surface and oil droplets during the flotation process Dispersion, thereby significantly improving the flotation recovery effect of coal slime.

The problem of poor recovery of clean coal by non-polar hydrocarbon oil in coal slime flotation is solved, and the object of the invention is achieved.

Advantages: The preparation method of fine coal flotation agent is used to improve the quality of clean coal. Compared with the traditional non-polar hydrocarbon oil collector, the flotation collector helps to break the hydration film on the mineral surface during the flotation process And the dispersion of oil droplets, improve the hydrophobicity of coal particles, thereby significantly improving the flotation recovery effect of coal slime.

Description of drawings

Figure 1 is a schematic diagram of equipment for preparing candle ash of the present invention.

Fig. 2 is a flow chart of the preparation of the flotation collector of the present invention.

Fig. 3 is the flow chart of the flotation process of the present invention.

Detailed ways

In Fig. 2, the flow chart of preparation of flotation collector, method steps are as follows:

(1) Preparation of candle ashes: Invert 250ml beakers at the top of 4 candle flames so that the flames do not burn completely, and the soot adheres to the inner wall of the beaker until there is a layer of candle ashes on the inner wall of the beaker. After the preparation is completed, collect it for later use; (as shown in Figure 1 );

(2) Take 1 g of the candle ash prepared in step (1), add it into 120-180 ml of non-polar hydrocarbon oil, mix it and let it stand for 24-48 hours; the flotation collector is obtained.

The non-polar hydrocarbon oil includes: any one of kerosene, modified kerosene, diesel oil, fuel oil, natural gas condensate oil or n-dodecane.

Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention.

Embodiment 1: Coal slime flotation agent, the raw material of nonpolar hydrocarbon oil collector is as follows according to solid-liquid ratio: candle ash 1g, nonpolar hydrocarbon oil 120-180ml; Stand still 24-48h after mixing; That is to obtain the flotation collector.

The non-polar hydrocarbon oil includes: any one of kerosene, modified kerosene, diesel oil, fuel oil, natural gas condensate oil or n-dodecane.

As shown in Figure 3, the concrete flotation process flow of the present invention, the steps are as follows:

1. Add fine-grained coal slime (raw material) with a particle size below 0.5 mm into the flotation tank, add tap water to adjust the slurry, and stir for 1-3 minutes.

2. Add collector to the slurry in step 1, and stir for 1-3 minutes.

3. Add foaming agent to the slurry in step 2, and stir for 0.5-1min.

4. Fill the pulp in step 3 with air bubbles for flotation; the flotation time is 3-5 minutes, and the particles floating out of the foam and the particles staying in the pulp are collected separately as the final clean coal and tailings products.

5. The fine-grained coal slime in the step 1 is long flame coal of Shendong Daliuta Coal Preparation Plant; the water in the step 1 is tap water, or deionized water, or circulating water of the production system.

6. The collector in the step 2 is compared with the collector prepared by the present invention and pure non-polar hydrocarbon oil, and the dosage is 5000, 7000, 9000 g/t dry coal slime respectively.

7. The foaming agent in the step 3 is 2-octanol, and the dosage is 150 g/t.

8. The solid mass concentration of the pulp in the step 2 is 60g/L.

9. In the step 7, when the dosage of different agents is different, compared with the non-polar hydrocarbon oil, the yield of clean coal increases by 0.99%, 3.09%, and 3.43%, respectively, and the ash content of clean coal decreases by 2.09%. 3.63%, 2.91%.

Claims (2)

1. a kind of Fine Coal Flotation collecting agent preparation method, it is characterized in that：Flotation collector preparation method, steps are as follows：

（1）Prepare candle ash：4 candle flame top portion thereof 250ml beaker so that flame imperfect combustion, cigarette ash attachment It prepares and completes, collect spare until beaker inner wall has coating of wax candle ash in beaker inner wall；

（2）By step（1）The candle ash of preparation takes 1g, is added in the non-polar hydrocarbon oil of 120-180ml, 24- is stood after mixing 48h；Obtain flotation collector.

2. a kind of Fine Coal Flotation collecting agent preparation method according to claim 1, it is characterized in that：The non-polar hydrocarbon Class oil includes：Kerosene, any one being modified in kerosene, diesel oil, fuel oil, natural gas cold oil or n-dodecane.