CN104014431A - Floatation process for oxidized coal slime - Google Patents
Floatation process for oxidized coal slime Download PDFInfo
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- CN104014431A CN104014431A CN201410222163.4A CN201410222163A CN104014431A CN 104014431 A CN104014431 A CN 104014431A CN 201410222163 A CN201410222163 A CN 201410222163A CN 104014431 A CN104014431 A CN 104014431A
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Abstract
The invention discloses a floatation process for oxidized coal slime and belongs to the technical field of coal washing and dressing. According to the method, the coal slime is reduced through organic reducing agents, then collecting agents and foaming agents are sequentially added to the coal slime and stirred, and finally clean coal and tailing products are floated. According to the method, as the organic reducing agents are added, the surface property of the coal slime is adjusted, the hydrophobic property of the coal slime is improved, and the floatation effect is improved; by the adoption of the floatation scheme, the floatation effect of the oxidized coal sling can be improved remarkably.
Description
Technical field
The present invention relates to a kind of coal slime floating process, be specifically related to a kind of floatation process of oxidized coal slime, belong to coal preparation technical field.
Background technology
Flotation is the effective ways of slime separation.In floatation process, add suitable surfactant can strengthen hydrophobicity and the floatability on coal slime surface, can promote the dispersion of collecting agent in ore pulp and in the absorption on coal slime surface, thereby improve clean coal yield and tail coal ash content, reduce reagent consumption, significantly improve coal slime flotation effect, improve coal slime flotation effect, particularly very remarkable to the flotation effect of difficult-to-float coal.
But for oxidized coal slime, because its surface hydrophilicity is strong, floatability is poor, adopt conventional dose to carry out flotation, there is the series of problems such as efficiency is low, reagent consumption is large.Need to seek efficient flotation promoter, as surfactant, adjusting agent etc.
Summary of the invention
The present invention aims to provide a kind of floatation process of oxidized coal slime, has improved the performance of existing collecting agent, and then reduces the flotation cost of collecting agent consumption, reduction oxidized coal slime, realizes the reasonable utilization of resource.
The present invention is achieved through the following technical solutions:
A method for floating for oxidized coal slime, first adopts organic reducing agent to reduce to coal slime, then adds successively collecting agent, foaming agent to stir, and finally floatingly selects cleaned coal, tail coal product.
Described method for floating comprises the following steps:
(1) oxidized coal slime and water are added to flotation cell, stir, adjusting pulp density is 60 ~ 120g/L, and regulating the pH value of ore pulp is 3 ~ 7;
(2) add reducing agent, consumption is 1.0 ~ 10kg/t oxidized coal slime, sizes mixing and stirs 2min;
(3) add collecting agent, consumption is 0.5 ~ 3kg/t oxidized coal slime, stirs 1min;
(4) add foaming agent, consumption is 0.1 ~ 0.5 kg/t oxidized coal slime, stirs 10s;
(5) start timing and scrape bubble, continue to scrape bubble 3 min;
(6) products obtained therefrom filters, dries, and weighs, chemically examines.
Further, described reducing agent is ascorbic acid (Vc).
Further, described collecting agent is by span80 and kerosene is composite makes, and wherein the shared ratio of Span80 is 5% ~ 20 %.
Further, described foaming agent is secondary octanol.
Further, adopt following method to regulate the pH value of ore pulp: first standby with HCl and NaOH preparation different pH value, in flotation cell, pour HCl and NaOH solution into, in moisturizing wash bottle, also add the aqueous solution of identical pH value, in floatation process, add water, whole floatation process keeps the constant of slurry pH in good time.Regulating the pH value of ore pulp is 3 ~ 7, and preferably pH value is 5 ~ 7.
Ascorbic acid is called for short Vc, is a kind of water soluble vitamin, and rich content in fruits and vegetables, has acidity and stronger reproducibility, very easily oxidized under heating, solution or alkali condition.In the present invention, choose ascorbic acid as reducing agent, changed the surface nature of oxidized coal slime, thereby improved flotation effect.
Of the present invention
beneficial effect:
(1) by adding organic reducing agent, regulate coal slime surface nature, improve its hydrophobicity, improve flotation effect.
(2) adopt flotation scheme of the present invention, can significantly improve oxidized coal slime flotation effect.
The specific embodiment
Below by embodiment, further illustrate the present invention, but be not limited to following examples.
Float test condition: adopt XFDIV type inflation single-trough flotating machine, speed of mainshaft 1800r/min, aeration quantity is 1.33L/min, flotation cell volume 1.5L, pulp density is 100g/L.
Oxidized coal slime preparation: general-0.5mm coal sample is placed in baking oven, is oxidized 24h under 200 ℃ of constant temperature, makes artificial oxidation's coal slime.
Comparative example 1: take kerosene as collecting agent, secondary octanol are foaming agent, oxidized coal slime is carried out to flotation.
The floatation process of the present embodiment comprises the following steps:
In flotation cell, add kerosene, add secondary octanol after the 1min that sizes mixing, start to scrape bubble after 10s, scraping the bubble time is 3min.Products obtained therefrom filters, dries, and weighs, chemically examines.
The present embodiment is studied for the collecting agent kerosene of different amounts.
When secondary octanol consumption is 100g/t, the oxidized coal slime flotation experimental results under different collector dosages is in Table 1:
Table 1 conventional flotation result of the test
Embodiment 1: take Vc as reducing agent, kerosene as collecting agent, secondary octanol carries out float test as foaming agent.
The floatation process of the present embodiment comprises the following steps:
With Vc, oxidized coal slime is carried out to the test of reducing agent consumption, concrete operation step is as follows: mineral syrup liquid reaches after graticule, takes after a certain amount of Vc adds flotation cell and sizes mixing, and adds kerosene, adds secondary octanol after the 1min that continues to size mixing after 2min, after stirring 10s, start to scrape bubble, scraping the bubble time is 3min.Products obtained therefrom filters, dries, and weighs, chemically examines.
In the present embodiment, Vc consumption is 1.25 ~ 10kg/t oxidized coal slime; The consumption of collecting agent kerosene is 1000g/t; The consumption of the secondary octanol of foaming agent is 100g/t.
The present embodiment has been chosen different Vc consumptions, and gained flotation experimental results is as shown in table 2:
Table 2 Vc consumption is selected result of the test
It is reducing agent that the present embodiment is chosen Vc, compare with comparative example 1 (in Table the first row data in 2), and the productive rate of flotation gained cleaned coal improves greatly, and smart pit ash declines to some extent.Illustrate that the inventive method flotation effect is good.
Embodiment 2: take Vc as reducing agent, kerosene as collecting agent, secondary octanol carries out float test as foaming agent.
The present embodiment carries out float test for the different pH values of pulp slurry, and choosing respectively pH value is 3,5,6,7,9,11.
The floatation process of the present embodiment comprises the following steps:
(1) in ore pulp, add reductant Vc, consumption is 10000g/t, sizes mixing and stirs 2min;
(2) add collecting agent kerosene, consumption is 1000g/t, stirs 1min;
(3) add the secondary octanol of foaming agent, consumption is 100g/t, stirs 10s;
(4) start timing and scrape bubble, time 3min;
(5) products obtained therefrom filters, dries, and weighs, chemically examines.
The present embodiment carries out float test for the different pH value of ore pulp, and gained flotation experimental results is in Table 3:
The result of the test of table 3 Vc flotation oxidized coal slime when different pH
As can be seen from Table 3, regulating the pH value of ore pulp is 3 ~ 7, and flotation effect is better, and preferably pH value is 5 ~ 7.
Embodiment 3: the Vc of take makes collecting agent, secondary octanol and carries out float test as foaming agent as reducing agent, span80 and kerosene are composite.
The floatation process of the present embodiment comprises the following steps:
(1) it is neutral regulating ore pulp: regulate pH=7;
(2) add reducing agent ascorbic acid (Vc), consumption is 1250g/t, sizes mixing and stirs 2min;
(3) add collecting agent, consumption is 1000g/t, stirs 1min;
Described collecting agent is by span80 and kerosene is composite makes, and the ratio of choosing Span80 and kerosene is: 20%:80%;
(4) add the secondary octanol of foaming agent, consumption is 100g/t, stirs 10s;
(5) start timing and scrape bubble, time 3min;
(6) products obtained therefrom filters, dries, and weighs, chemically examines.
Flotation experimental results under different medicament combinations is in Table 4:
Oxidized coal slime flotation experimental results under the different medicament compound actions of table 4
。
In table 4, the first row is in comparative example 1, the second row is in embodiment 1, the third line data are data that experimentation draws routinely in the situation that not adding Vc, fourth line data are to test according to the technical program the data that draw, obviously, according to the technical program, carry out the flotation experimental results of oxidized coal slime best.
Claims (6)
1. a method for floating for oxidized coal slime, is characterized in that: first adopt organic reducing agent to reduce to coal slime, then add successively collecting agent, foaming agent to stir, finally floatingly select cleaned coal, tail coal product.
2. the method for floating of oxidized coal slime according to claim 1, is characterized in that: comprise the following steps:
(1) oxidized coal slime and water are added to flotation cell, stir, adjusting pulp density is 60 ~ 120g/L, and regulating the pH value of ore pulp is 3 ~ 7;
(2) add reducing agent, consumption is 1.0 ~ 10kg/t oxidized coal slime, sizes mixing and stirs 2min;
(3) add collecting agent, consumption is 0.5 ~ 3kg/t oxidized coal slime, stirs 1min;
(4) add foaming agent, consumption is 0.1 ~ 0.5 kg/t oxidized coal slime, stirs 10s;
(5) start timing and scrape bubble, continue to scrape bubble 3 min;
(6) products obtained therefrom filters, dries, and weighs, chemically examines.
3. the method for floating of oxidized coal slime according to claim 2, is characterized in that: described reducing agent is ascorbic acid.
4. the method for floating of oxidized coal slime according to claim 2, is characterized in that: described collecting agent is by span80 and kerosene is composite makes, and wherein the shared ratio of Span80 is 5% ~ 20 %.
5. the method for floating of oxidized coal slime according to claim 2, is characterized in that: described foaming agent is secondary octanol.
6. the method for floating of oxidized coal slime according to claim 2, is characterized in that: in described step (1), regulating the pH value of ore pulp is 5 ~ 7.
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| CN201410222163.4A CN104014431A (en) | 2014-05-26 | 2014-05-26 | Floatation process for oxidized coal slime |
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| CN201410222163.4A CN104014431A (en) | 2014-05-26 | 2014-05-26 | Floatation process for oxidized coal slime |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880031A (en) * | 2016-04-06 | 2016-08-24 | 武汉理工大学 | Flotation method of hydrophilic coal slime |
| CN106669977A (en) * | 2016-06-20 | 2017-05-17 | 中国矿业大学 | Sorting method of oxidized coal slurry |
| CN106669981A (en) * | 2016-06-20 | 2017-05-17 | 中国矿业大学 | Oxidized coal slime separation method based on CO2 air bubbles |
| CN107335546A (en) * | 2017-08-10 | 2017-11-10 | 江苏师范大学 | A kind of low-rank coal flotation method based on positively charged bubble |
| CN108262173A (en) * | 2018-01-20 | 2018-07-10 | 华北科技学院 | A kind of coal slime cooperates with floatation process |
| CN109332004A (en) * | 2018-10-16 | 2019-02-15 | 山西工程技术学院 | A kind of microfine oxidation coal flotation process |
| CN111589590A (en) * | 2020-05-27 | 2020-08-28 | 上海是大高分子材料有限公司 | Flotation method for oxidized coal slime |
| CN112246445A (en) * | 2020-08-27 | 2021-01-22 | 中国恩菲工程技术有限公司 | Foam sorting activator and application thereof |
-
2014
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880031A (en) * | 2016-04-06 | 2016-08-24 | 武汉理工大学 | Flotation method of hydrophilic coal slime |
| CN105880031B (en) * | 2016-04-06 | 2018-08-07 | 武汉理工大学 | A kind of method of hydrophilic coal slime flotation |
| CN106669977A (en) * | 2016-06-20 | 2017-05-17 | 中国矿业大学 | Sorting method of oxidized coal slurry |
| CN106669981A (en) * | 2016-06-20 | 2017-05-17 | 中国矿业大学 | Oxidized coal slime separation method based on CO2 air bubbles |
| CN107335546A (en) * | 2017-08-10 | 2017-11-10 | 江苏师范大学 | A kind of low-rank coal flotation method based on positively charged bubble |
| CN108262173A (en) * | 2018-01-20 | 2018-07-10 | 华北科技学院 | A kind of coal slime cooperates with floatation process |
| CN109332004A (en) * | 2018-10-16 | 2019-02-15 | 山西工程技术学院 | A kind of microfine oxidation coal flotation process |
| CN111589590A (en) * | 2020-05-27 | 2020-08-28 | 上海是大高分子材料有限公司 | Flotation method for oxidized coal slime |
| CN111589590B (en) * | 2020-05-27 | 2021-11-19 | 上海是大高分子材料有限公司 | Flotation method for oxidized coal slime |
| CN112246445A (en) * | 2020-08-27 | 2021-01-22 | 中国恩菲工程技术有限公司 | Foam sorting activator and application thereof |
| CN112246445B (en) * | 2020-08-27 | 2022-06-10 | 中国恩菲工程技术有限公司 | Foam sorting activator and application thereof |
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