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A method of improving the hollow ball forming rate of coal slime floating beads

A ball forming rate and coal slime technology, which is applied in glass forming, manufacturing tools, glass manufacturing equipment, etc., can solve the problems of waste of coal resources, low hollow ball forming rate, difficult transportation of coal slime, etc., and achieve simple production process, The effect of short reaction time and increased feasibility

Active Publication Date: 2022-06-24
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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  • A method of improving the hollow ball forming 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, and the composition and content of each main component after drying are SiO 2 49% Fe 2 O 3 5%, Al 2 O 3 33%, C 44%. Drying and repeatedly grinding and sieving the slime to below 600 mesh; mixing the slime powder with NaOH solution with a concentration of 100g / L, the liquid-solid ratio of 4mL:1g, and grinding for 4h under the wet method condition of 200 ℃ in a homogeneous reactor, Filter, dry, grind, homogenize, and pass through a 600-mesh sieve to obtain activated slime fine powder. The activated slime powder is suspended and roasted in the furnace by air flow control. The roasting temperature is 1600 °C. After the suspension roasting reaction time is 10s, the air flow control system is closed, so that the hollow floating beads are rapidly cooled and quickly separated from the high temperature furnace before shrinking. The hollow ball forming rate is 66%.

Embodiment 2

[0028] Coal slime from a coal preparation plant in Shanxi is used, and the main components and content of each main component after drying are SiO 2 49% Fe 2 O 3 5%, Al 2 O 3 33%, C 44%. Drying and grinding and sieving the coal slime to below 600 mesh repeatedly; mixing the coal slime powder with a NaOH solution with a concentration of 140g / L, the liquid-solid ratio of 4mL:1g, and grinding it in a homogeneous reactor at 200 ℃ wet method for 4h, Filter, dry, grind, homogenize, and pass through a 600-mesh sieve to obtain activated slime fine powder. The activated slime powder is suspended and roasted in the furnace by air flow control. The roasting temperature is 1300 ° C. After the suspension roasting reaction time is 5s, the air flow control system is turned off, so that the hollow floating beads are rapidly cooled and quickly separated from the high temperature furnace before shrinking. The hollow spherical rate of beads is 57%.

Embodiment 3

[0030] Coal slime from a coal preparation plant in Shanxi is used, and the main components and content of each main component after drying are SiO 2 49% Fe 2 O 3 5%, Al 2 O 3 33%, C 44%. Drying and repeatedly grinding and sieving the slime to below 600 mesh; mixing the slime powder with the NaOH solution with a concentration of 120g / L, the liquid-solid ratio of 6mL:1g, and grinding for 4h under the wet process condition of 200 ℃ in a homogeneous reactor, filtering , drying, grinding, homogenizing, and passing through a 600-mesh sieve to obtain activated slime fine powder. The activated slime powder is suspended and roasted in the furnace by air flow control. The roasting temperature is 1600 °C. After the suspension roasting reaction time is 10s, the air flow control system is closed, so that the hollow floating beads are rapidly cooled and quickly separated from the high temperature furnace before shrinking. The hollow spherical rate of beads is 75%.

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Abstract

The invention discloses a method for improving the hollow-forming rate of coal slime floating beads. In the method, after mixing coal slime powder with NaOH solution and / or KOH solution, grinding I, filtering, drying, grinding II, and homogenization are carried out in sequence. and sieving to obtain activated coal slime powder, and the activated coal slime powder is subjected to gas suspension roasting to obtain coal slime floating beads. This method can greatly improve the pelleting rate of hollow floating beads prepared from coal slime through activation treatment of coal slime .

Description

technical field [0001] The invention relates to a method for treating coal slime solid waste, in particular to a method for preparing high-altitude 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, which is harmful to the environment. By 2025, my country's raw coal mining volume is expected to reach 5 billion tons. According to 80% of human needs, washing and processing will be carried out. In the end, the total amount of washed coal will exceed 4 billion tons, and the annual output of coal slime will exceed 500 million tons. Reasonable 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 coal slime recovered by coal plants is mostly treated by open-air sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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