CN105772212B - A kind of moderate cohesive coal produces extraordinary white cement coal method - Google Patents

Abstract

A kind of moderate cohesive coal produces extraordinary white cement coal method, used when selecting and produce suitable for coal, it is raw coal not walk using moderate cohesive coal, pass through the heavy magnetic process integration of the selected magnetic separation of jigging roughing hydrocyclone, iron-holder in ash content and raw coal is reduced, produces extraordinary ultra low-ash, low iron-holder white cement coal；To ensure extraordinary white cement coal iron content, assorting room is carried out in aqueous medium.The technological process of production is simple, and cost is low, is easy to promote, and sulphur coal can be used to be produced for the technique in addition, advantageously account for sulphur coal application problem.

Description

A coal-use method for producing special white cement from medium caking coal

technical field

The technology relates to a method of using coal for producing special white cement, and is especially suitable for a method of using coal for producing special white cement with medium caking coal used in the field of coal processing.

Background of the invention

White cement is widely used in architectural decoration projects because of its high strength, good hydraulicity and the ability to adjust into different colors. my country is the only country that uses coal to burn white cement so far.

Fuel requirements for white cement production: heavy oil, natural gas or petroleum coke that does not produce ash should be preferred. If coal is used, low ash should be selected, especially bituminous coal with low Fe ₂ O ₃ content in ash or clean coal for coking. Should meet: (the following are industry requirements)

Volatile matter 25%～32%

Ash<12%

Calorific value>27200kJ/kg

w(Fe ₂ O ₃ ) in ash<0.8%

At present, there is no method of using medium caking coal to produce special white cement.

Contents of the invention

Aiming at the deficiencies of the prior art, a coal-using method for producing special white cement from medium caking coal with simple steps, stable production and high efficiency is provided.

In order to realize above-mentioned technical object, medium cohesive coal of the present invention produces special white cement coal method, and its steps are as follows:

a. Use 50mm screening equipment to pre-screen the raw coal, feed the raw coal with a diameter of less than 50mm into the desliming screen with a diameter of 1mm, and feed the raw coal with a diameter greater than 50mm into the crushing screen Continue to sieve after crushing;

b. Use a desliming screen with an aperture of 1 mm to perform desliming operations on raw coal with a diameter of less than 50 mm, and obtain raw coal products under the sieve with a diameter of less than 1 mm, and raw coal products with a diameter of 50-1 mm on the sieve, and the diameter of the upper part of the desliming screen is 50 -1mm raw coal products are sent to the jig for gravity separation, and the clean coal after gravity separation and the clean coal with a diameter of less than 1mm under the screen are fed into the slime barrel to prepare for coarse slime treatment;

c. Feed the raw coal products with a diameter of 50-1mm into the buffer bin of the jig machine, use the jig machine to separate the gangue and high-ash clean coal, and use the linear vibrating screen to dehydrate the gangue and discharge it out of the system;

d. For the clean coal entering the slime tank, add water to adjust the slurry, adjust the slurry to a concentration of 15%, and use pumps to Water medium cyclone, under the feed pressure of 0.045-0.1Mpa, the ultra-low ash clean coal and tailing coal are separated, and the tail coal is dehydrated by a fixed sieve-centrifuge and mixed with coarse slime clean coal to become the final low ash clean coal product;

e. Feed the ultra-low ash clean coal into the magnetic separation equipment, use the magnetic separation equipment to remove iron from the ultra-low ash clean coal, and dehydrate through the centrifuge to obtain the magnetic separation concentrate and discharge it as the iron-containing mineral part, tailings Dehydration by a centrifuge to obtain the final coal for special white cement;

f. Put the raw coal product under the desliming screen into the slime bucket, and then classify it through the grading cyclone. The underflow enters the coarse slime separator, and the coarse slime clean coal is dehydrated by the centrifuge to become the final low ash clean coal product;

g. Using the overflow of the coal slime grading cyclone, the centrifugal liquid of each centrifuge, and the waste water from the gangue dehydration screen to obtain the coal slime through the operation of concentration-filtration.

A jig and a water medium cyclone are used to reduce the ash of the raw coal, and the separation medium is water; the clean coal of the water medium cyclone reduces the iron content through magnetic separation; the magnetic separation equipment used for the clean coal is a wet coarse-grained strong magnetic Choose machine.

Beneficial effect: This method adopts two-stage ash reduction and two-stage iron removal methods: two-step ash reduction through jigging rough separation-water medium cyclone selection, two-step iron removal through gravity separation-magnetic separation, and full water medium gravity separation The method and combined gravity and magnetic process are beneficial to strictly guarantee the quality requirements of coal used in special white cement. The production process is simple, the cost is low, and the promotion is convenient. In addition, the process can use high-sulfur coal for production, which is beneficial to solve the problem of high-sulfur coal application.

invention drawings

Fig. 1 is a method structural diagram of the present invention.

specific embodiment

Below in conjunction with example this technology is further described in detail:

As shown in Figure 1, medium cohesive coal of the present invention produces special white cement coal method, and its steps are as follows:

a. Use 50mm screening equipment to pre-screen the raw coal, feed the raw coal with a diameter of less than 50mm into the desliming screen with a diameter of 1mm, and feed the raw coal with a diameter greater than 50mm into the crushing screen Continue to sieve after crushing;

b. Use a desliming screen with an aperture of 1 mm to perform desliming operations on raw coal with a diameter of less than 50 mm, and obtain raw coal products under the sieve with a diameter of less than 1 mm, and raw coal products with a diameter of 50-1 mm on the sieve, and the diameter of the upper part of the desliming screen is 50 -1mm raw coal products are sent to the jig for gravity separation, and the clean coal after gravity separation and the clean coal with a diameter of less than 1mm under the screen are fed into the slime barrel to prepare for coarse slime treatment;

c. Feed the raw coal products with a diameter of 50-1mm into the buffer bin of the jig machine, use the jig machine to separate the gangue and high-ash clean coal, and use the linear vibrating screen to dehydrate the gangue and discharge it out of the system;

d. For the clean coal entering the slime tank, add water to adjust the slurry, adjust the slurry to a concentration of 15%, and use pumps to Water medium cyclone, under the feed pressure of 0.045-0.1Mpa, the ultra-low ash clean coal and tailing coal are separated, and the tail coal is dehydrated by a fixed sieve-centrifuge and mixed with coarse slime clean coal to become the final low ash clean coal product;

e. Feed the ultra-low ash clean coal into the magnetic separation equipment, use the magnetic separation equipment to remove iron from the ultra-low ash clean coal, and dehydrate through the centrifuge to obtain the magnetic separation concentrate and discharge it as the iron-containing mineral part, tailings Dehydration by a centrifuge to obtain the final coal for special white cement;

f. Put the raw coal product under the desliming screen into the slime bucket, and then classify it through the grading cyclone. The underflow enters the coarse slime separator, and the coarse slime clean coal is dehydrated by the centrifuge to become the final low ash clean coal product;

g. Using the overflow of the coal slime grading cyclone, the centrifugal liquid of each centrifuge, and the waste water from the gangue dehydration screen to obtain the coal slime through the operation of concentration-filtration.

A jig and a water medium cyclone are used to reduce the ash of the raw coal, and the separation medium is water; the clean coal of the water medium cyclone reduces the iron content through magnetic separation; the magnetic separation equipment used for the clean coal is a wet coarse-grained strong magnetic Choose machine.

The method includes two stages of ash reduction and two stages of iron removal to produce ultra-low ash and low iron content coal: jigging rough separation-water medium cyclone selection two-step ash reduction, gravity separation-magnetic separation combined two-step iron removal ,specifically is:

(1) Ultra-low ash clean coal is obtained through jigging rough separation-water medium cyclone selection two-step separation, ash reduction and preliminary iron removal are all carried out in water medium, which is easy to ensure the iron content of coal for special white cement.

(2) Use magnetic separation to further reduce the iron content of gravity-selected clean coal, and strictly ensure the quality of coal used for special white cement.

Embodiment one:

Using medium cohesive gas coal in Shandong area to produce special white cement coal through the process of jigging rough separation-water medium cyclone selection-strong magnetic separation, which meets the requirements of subsequent utilization. Specifically:

Sieve medium caking gas coal (ash content 34.23%, Fe ₂ O ₃ content 0.83%, caking index 38.2, sulfur content 4.19%) through a 50mm circular vibrating sieve. The required raw coal (yield 91.25%, ash content 30.53%) obtained by 1mm desliming screen is 50-1mm, and enters the subsequent gravity separation process. 50-1mm raw coal enters the jig to separate high-ash clean coal and gangue. The gangue is directly discharged after being dehydrated by the linear vibrating screen. High ash clean coal (yield 51.81%, ash content 5.65%, Fe ₂ O ₃ content 0.52%) flows into the mixing tank and is pumped to The water medium cyclone is used to separate ultra-low ash clean coal (yield 36.54%, ash content 1.68%, Fe ₂ O ₃ content 0.35%) under the condition of separation pressure 0.045-0.1Mpa. The ultra-low ash clean coal flows into the buffer tank and is pumped to the wet coarse-grained strong magnetic separator. The magnetic separation tailings are dehydrated by the centrifuge to obtain special white cement coal (yield 35.89%, ash content 1.63%, Fe ₂ O ₃ content 0.20 %, caking index 96.6); the magnetically separated concentrate is dehydrated by a centrifuge and discharged as iron-containing minerals.

Claims (4)

1. a kind of method that moderate cohesive coal produces extraordinary white cement coal, it is characterised in that step is as follows：

A. raw coal is passed through into prescreening using 50mm screening plants, divides lower part of screen of the diameter screened out less than 50mm to raw coal Feed aperture and be 1mm desliming screen, and sieve after raw coal of the upper part diameter more than 50mm then feeds crusher in crushing and continue to sieve；

B. desliming operation is carried out to raw coal of the diameter less than 50mm using the desliming screen that aperture is 1mm, obtains diameter less than 1mm's The lower raw coal product of sieve, raw coal product on diameter 50-1mm sieve, the diameter 50-1mm raw coal products of desliming screen sieve upper part are fed Jigging machine gravity treatment, the cleaned coal that lower part of screen divides diameter to be less than 1mm feed coal slime bucket and are ready for handling；

C. diameter 50-1mm raw coal products are fed into jigging machine surge bunker, spoil and high grey cleaned coal is sub-elected using jigging machine, its Discharge system after spoil is dehydrated by middle utilization linear vibrating screen；

D. it is directed to the high grey cleaned coal sub-elected into the jigging machine of coal slime bucket to carry out adding water to size mixing, sizes mixing to concentration 15%, utilize Hydrocyclone is pumped to, ultra low-ash cleaned coal and tail coal are sub-elected under 0.045-0.1Mpa feed pressures, tail coal is through fixation Final low ash extract coal product is mixed into after sieve-centrifuge dewatering with coarse slime cleaned coal；

E. ultra low-ash cleaned coal is fed into magnetic plant, iron removaling is carried out to ultra low-ash cleaned coal using magnetic plant, and pass through centrifuge Obtain magnetic concentrate after dehydration to be discharged as iron-bearing mineral part, mine tailing obtains final extraordinary white cement by centrifuge dewatering Use coal；

F. desliming screen is sieved into lower raw coal product and enters coal slime bucket, be classified through classifying cyclone, underflow enters separation of coarse slime machine, slightly Coal slime cleaned coal turns into final low ash extract coal product after centrifuge dewatering；

G. concentration-press filtration operation is passed through using the overflow of coal slime classifying cyclone, each centrifuge liquid, spoil dehydration backwater Obtain coal slime.

2. moderate cohesive coal according to claim 1 produces extraordinary white cement coal method, it is characterised in that：Using jump Eliminate machine and combine progress raw coal drop ash with hydrocyclone, separating medium is water.

3. moderate cohesive coal according to claim 1 produces extraordinary white cement coal method, it is characterised in that：Aqueous medium Cyclone cleaned coal reduces iron content by magnetic separation.

4. moderate cohesive coal according to claim 1 produces extraordinary white cement coal method, it is characterised in that：The essence Magnetic plant used in coal is wet type coarse grain intensity magnetic separator.