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Method for improving hollow balling rate of coal slime floating beads

A technology of pelletizing rate and slime, which is applied in glass forming, glass manufacturing equipment, manufacturing tools, etc., can solve the problems of wasting coal resources, difficult to transport slime, low hollow pelletizing rate, etc. The effect of increased feasibility, short reaction time

Active Publication Date: 2022-02-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coal slime recycled by the coal plant is mostly disposed of in the open air. The coal slime is extremely unstable in the piled state. It will be lost when it meets water, and it will fly when it is air-dried. At present, some coal washing companies lack effective means and methods for the disposal of coal slime. This method not only wastes precious coal resources, but also causes serious environmental pollution, and sometimes even restricts the normal development of coal washing operations.
[0004] Coal slime has the characteristics of fine particle size, strong water holding capacity, high ash content, and high viscosity, which makes it difficult to transport coal slime, troublesome loading and unloading, and will greatly increase the amount of ineffective transportation
Moreover, the quality of general coal slime is not stable, and the low calorific value will cause adverse effects on combustion or coking, which seriously affects the industrial utilization value of coal slime
Using coal slime to produce floating beads is an effective way to turn waste into treasure, but there is generally a technical bottleneck of low hollow ball forming rate

Method used

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  • Method for improving hollow balling rate of coal slime floating beads

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Coal slime from a coal preparation plant in Shanxi is used. After drying, the main components and content are SiO 2 49%, Fe 2 o 3 5%, Al 2 o 3 33%, C 44%. Dry the coal slime repeatedly and sieve it to below 600 mesh; mix the coal slime powder with a NaOH solution with a concentration of 100g / L, the liquid-solid ratio is 4mL:1g, and grind it in a homogeneous reactor at 200°C for 4h under wet conditions. Filter, dry, grind, homogenize, and pass through a 600-mesh sieve to obtain activated coal slime micropowder. The activated coal slime powder is suspended and roasted in the furnace through airflow control. The roasting temperature is 1600°C. After the suspension roasting reaction time is 10s, the airflow control system is turned off, so that the hollow floating beads are rapidly cooled and quickly separated from the high-temperature furnace when they have not shrunk. The bead hollow forming rate is 66%.

Embodiment 2

[0028] Coal slime from a coal preparation plant in Shanxi is used. After drying, the main components and content are SiO 2 49%, Fe 2 o 3 5%, Al 2 o 3 33%, C 44%. Dry the coal slime repeatedly and sieve it to below 600 mesh; mix the coal slime powder with a NaOH solution with a concentration of 140g / L, the liquid-solid ratio is 4mL:1g, and grind it in a homogeneous reactor at 200°C for 4h under wet conditions. Filter, dry, grind, homogenize, and pass through a 600-mesh sieve to obtain activated coal slime micropowder. The activated coal slime powder is suspended and roasted in the furnace through airflow control. The roasting temperature is 1300 ° C. After the reaction time of suspension roasting is 5s, the airflow control system is turned off, so that the hollow floating beads are rapidly cooled and quickly separated from the high-temperature furnace when they have not shrunk. The bead hollow-forming rate is 57%.

Embodiment 3

[0030] Coal slime from a coal preparation plant in Shanxi is used. After drying, the main components and content are SiO 2 49%, Fe 2 o 3 5%, Al 2 o 3 33%, C 44%. Dry and grind the coal slime repeatedly and sieve it to below 600 mesh; mix the coal slime powder with a NaOH solution with a concentration of 120g / L, the liquid-solid ratio is 6mL:1g, grind for 4 hours in a homogeneous reactor at 200°C under wet conditions, and filter , drying, grinding, homogenizing, and passing through a 600-mesh sieve to obtain activated coal slime powder. The activated coal slime powder is suspended and roasted in the furnace through airflow control. The roasting temperature is 1600°C. After the suspension roasting reaction time is 10s, the airflow control system is turned off, so that the hollow floating beads are rapidly cooled and quickly separated from the high-temperature furnace when they have not shrunk. The bead hollow-forming rate is 75%.

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Abstract

The invention discloses a method for improving the hollow balling rate of coal slime floating beads, which comprises the steps of mixing coal slime powder with a NaOH solution and / or a KOH solution, sequentially carrying out grinding I, filtering, drying, grinding II, homogenizing and sieving to obtain activated coal slime micro powder, and carrying out gas suspension roasting on the activated coal slime powder to obtain the coal slime floating beads. According to the method, by means of conducting activation treatment on the coal slime, the balling rate of the hollow floating beads prepared from the coal slime can be greatly improved.

Description

technical field [0001] The invention relates to a coal slime solid waste treatment method, in particular to a method for preparing high hollow rate coal slime floating beads by using coal slime, and belongs to the technical field of solid waste resource utilization. Background technique [0002] Coal slime is a kind of solid waste produced in the process of coal production that has great harm to the environment. It has small particles, high viscosity, large ash content, difficult dehydration, and low calorific value. By 2025, my country's raw coal mining volume is expected to reach 5 billion tons, and 80% of human needs will be washed and processed. The total amount of washed coal will exceed 4 billion tons, and the annual output of coal slime will exceed 500 million tons. Proper disposal or resource utilization will seriously pollute the environment. [0003] At present, coal slime has not been well utilized as a resource, but its calorific value is only used as fuel. The ...

Claims

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Application Information

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IPC IPC(8): C03C11/00C03C1/00C03B19/10C03C6/00
CPCC03C11/002C03C1/002C03B19/107
Inventor 王艳秀孙伟王莉莎王成文黄丹丹高志勇孙磊董英狄
Owner CENT SOUTH UNIV
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