CN105838466A

CN105838466A - Method for microbial ash removal of coal

Info

Publication number: CN105838466A
Application number: CN201610350864.5A
Authority: CN
Inventors: 杨志超; 张素红; 刘生玉; 郭建英
Original assignee: Taiyuan University of Technology
Current assignee: Taiyuan University of Technology
Priority date: 2016-05-25
Filing date: 2016-05-25
Publication date: 2016-08-10

Abstract

The invention discloses a method for microbial ash removal of coal, and belongs to the technical field of coal washing selection processing. The method comprises the following steps: crushing coal into granularities of less than 0.074 mm by virtue of a crusher, mixing a coal sample and a microbial liquid culture medium according to a certain proportion for sterilization treatment, inoculating a paenibacillus polymyxa strain into the sterilized culture medium, performing culturing in a constant temperature oscillation incubator, and finally performing filtration, washing and drying. According to the method, ash in difficult-to-float coal can be effectively removed, and the ash removal rate can maximally reach 70 percent. The method is easy to operate, mild in treatment condition and low in cost, and not only are active ingredients in the coal preserved, but also microbial culture cost is relatively lower.

Description

A kind of method of coal biology deliming

Technical field

A kind of method that the present invention relates to coal biology deliming, belongs to coal preparation technical field.

Background technology

Coal is important fossil energy, raw coal has been mixed into various dirt in forming process, in exploitation and transportation, it is mixed into the most again top board and the rock of base plate and other impurity, for improving Coal Quality, the most effectively utilizes coal resources raw coal must be carried out washing deliming.Restriction coal in China washing deliming mainly has following several situation at present: one is that overwhelming majority coal preparation plant of China uses dense medium or jigging as main sorting process; this sorting process can produce a large amount of secondary slime; coal slime washability is caused to be deteriorated; floatation clean coal ash is higher; the loss of main separation clean coal yield is serious; make China's coal slime account for the ratio of coal increasing, the most seriously restrict comprehensive utilization and the environmental conservation of coal resources in China；Two is to there is a large amount of intergrowth in coal, it is necessary to finely ground ability monomer dissociation, and fine grinding can cause argillization, and the easy cover cap of clay class shale enters cleaned coal on cleaned coal surface or with current, causes cleans ash high, does not reaches coal quality requirements；Three be in coal containing a large amount of Kaolin time, be easily macerated and flushed at ore pulp, argillization becomes superfine hydrophilic granules, and absorption, on coal grain surface, is polluted cleaned coal, and stoped the absorption to bubble of the coal grain, reduce separating effect.

Focusing primarily upon bacterial desulfurization currently, with respect to biotechnology research in terms of coal upgrading, inorganic sulfur in coal (pyrite) and organic sulfur can be that sulfate radical is discharged in solution by autotrophic type desulfurization microorganism, thus complete the removing of sulfur in coal.But the microorganism removing of ash in coal be have not been reported.Research shows, the mineral constituting ash content of coal are mainly the mineral such as silicate, quartz, carbonate, sulfate, the microorganism removing of these mineral usually utilizes the antibacterials such as the colloid bacillus cereus of heterotroph, Bacillus circulans, bacillus polymyxa and Aspergillus niger or fungus to dissolve, aoxidizes or the effect such as reduction, the growth needs of these microorganisms provides material as carbon and the source of energy, and institute's carbon containing can be that growth of microorganism provides carbon source in coal, reduce the cost of microbial technique.

Summary of the invention

It is desirable to provide a kind of method of coal biology deliming, the problem being difficult by existing physics and chemistry coal preparation method removing ash in order to solve part coal, especially coal slime, present invention may also apply to the preparation of super clean coal.

A kind of method that the invention provides coal biology deliming, comprises the following steps:

(1) coal powder being broken to granularity is below 0.074mm；

(2) preparing microorganism growth fluid medium, adds the coal in step (1) and is made into coal slurry in liquid medium within, regulation pH value is 6.5 ~ 7.8, and coal slurry is in 121 DEG C of autoclaving 20min；

(3) in the coal slurry of step (2), access Paenibacillus polymyxa, in 28～32 DEG C of shaken cultivation casees, cultivate deliming；

(4) microorganism de-ash coal is washed, filters and dried, in 70 ~ 105 DEG C of drying baker, be dried 0.5 ~ 3h.

In said method, in step (2), the formula of culture medium is: sucrose 0 ~ 6.0 g/L, Na₂HPO₄1.0 ~ 3.0 g/L, MgSO₄•7H₂O 0.3 ~ 1.0 g/L, FeCl₃0.001 ~ 0.01 g/L, CaCl₂0.05 ~ 0.2 g/L, Kaolin 0 ~ 0.75 g/L, and the pH value of culture medium is 6.5 ~ 7.8.

In said method, in step (2) coal slurry, the mass concentration of coal is 5 ~ 30%.

In said method, in step (3), Paenibacillus polymyxa access amount is the 5 ~ 20% of culture volume, and shaken cultivation case rotating speed is 150 ~ 200 r/min, and the deliming time is 3 ~ 7d.

The present invention'sBeneficial effect:

(1) present invention can effectively remove the ash that cannot be separated with coal by conventional method for separating in coal because of adhesion, and in coal slime, cover cap is at the ash on cleaned coal surface；

(2) cleaned coal deep cleaning can be prepared super clean coal by the method；

(3) the method has good deliming effect to the coal constituting ash predominantly clay mineral, and deashing method is simple to operate, and treatment conditions are gentle, remain the effective ingredient in coal, and microorganism culturing condition is extensive, environmental friendliness, low cost.

Detailed description of the invention

The present invention is as follows by the flow process of microorganism removing ash content of coal:

First coal sample and preparation fluid medium are crushed；

2. above-mentioned coal sample and fluid medium are mixed into certain density coal slurry, and sterilizing；

3. to above-mentioned sterilizing coal slurry accesses Paenibacillus polymyxa strain, shaken cultivation deliming is carried out；

4. carry out washing, filter and drying by above-mentioned de-ash coal.

Further illustrate the present invention below by embodiment, but be not limited to following example.

Embodiment 1:

Ash is the coal sample of 40.85%, due to coal and the mineral association constituting ash, it is more difficult to monomer dissociation, direct reverse flotation froth pulp ash is about 30%, it is difficult to flotation deliming.

The present invention is used to carry out specifically comprising the following steps that of microorganism deliming

(1) coal sample is crushed to below 0.074mm；

(2) preparation fluid medium (sucrose 5.0 G/L, Na₂HPO₄2.0 g/L, MgSO₄•7H₂O 1.0 g/L, FeCl₃0.01 g/L, CaCl₂0.1 g/L, Kaolin 0. 5 G/L), adding in fluid medium and pulverize coal sample, be made into the coal slurry that mass concentration is 10%, regulation pH value is 7.3, high pressure steam sterilization；

(3) Paenibacillus polymyxa accessed in step (2) coal slurry, access amount is the 10% of culture volume, cultivates in 30 DEG C of constant-temperature shaking incubators, and shaken cultivation case rotating speed is 150 R/min, the deliming time is 7d；

(4) de-ash coal filters, and washes 3 times, and 105 DEG C of drying are to be analyzed.

The present embodiment testing result is: clean coal yield 71.4%, ash 26.30%, microorganism deliming rate 54.03%.

Embodiment 2:

Ash is the coal slime of 30.24%, accounts for 51.38% less than 0.045mm grade, this grade ash 42.92%, and gangue mineral is mainly Kaolin, illite and quartz.

(1) coal sample is crushed to below 0.074mm；

(2) preparation fluid medium (sucrose 2.0 G/L, Na₂HPO₄1.0 g/L, MgSO₄•7H₂O 0.5 g/L, FeCl₃0.005 g/L, CaCl₂0.15 g/L, adds in fluid medium and pulverizes coal sample, is made into the coal slurry that concentration is 20%, and regulation pH value is 7.5, high pressure steam sterilization；

(3) accessing the Paenibacillus polymyxa of 15% in step (2) coal slurry, cultivate in 28 DEG C of constant-temperature shaking incubators, shaken cultivation case rotating speed is 200 R/min, the deliming time is 4d；

(4) de-ash coal filters, and washes 3 times, and 100 DEG C of drying are to be analyzed.

The present embodiment testing result is: clean coal yield 64.9%, ash 18.21%, microorganism deliming rate 60.94%.

Embodiment 3:

Ash is the brown coal cleaned coal of 9.03%, and constituting ash ore deposit is Kaolin, quartz.

(1) coal sample is crushed to below 0.074mm；

(2) preparation fluid medium (Na₂HPO₄2.0 g/L, MgSO₄•7H₂O 0.75 g/L, FeCl₃0.01 g/L, CaCl₂0.1 g/L, Kaolin 0. 6 G/L), adding in fluid medium and pulverize coal sample, be made into the coal slurry that concentration is 15%, regulation pH value is 7.0, high pressure steam sterilization；

(3) accessing the Paenibacillus polymyxa of 20% in step (2) coal slurry, cultivate in 30 DEG C of constant-temperature shaking incubators, shaken cultivation case rotating speed is 180 R/min, the deliming time is 3d；

(4) de-ash coal filters, and washes 5 times, and 75 DEG C of drying are to be analyzed.

The present embodiment testing result is: clean coal yield 92.8%, ash 2.91%, microorganism deliming rate 70.09%.

Claims

1. the method for a coal biology deliming, it is characterised in that: comprise the following steps:

(1) coal powder being broken to granularity is below 0.074mm；

The method of coal biology deliming the most according to claim 1, it is characterised in that: in described step (2), the formula of culture medium is: sucrose 0 ~ 6.0 g/L, Na₂HPO₄ 1.0 ~ 3.0 g/L, MgSO₄•7H₂O 0.3~1.0 G/L, FeCl₃ 0.001~0.01 G/L, CaCl₂ 0.05~0.2 G/L, Kaolin 0 ~ 0.75 g/L, and the pH value of culture medium is 6.5 ~ 7.8.

The method of coal biology deliming the most according to claim 1, it is characterised in that: in step (2), in coal slurry, the mass concentration of coal is 5 ~ 30%.

The method of coal biology deliming the most according to claim 1, it is characterised in that: in step (3), Paenibacillus polymyxa access amount is the 5 ~ 20% of culture volume, and shaken cultivation case rotating speed is 150 ~ 200 r/min, and the deliming time is 3 ~ 7d.