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Method for producing roadbed base material from low-calorific-value solid waste

A solid waste and basic material technology, applied in the field of low-calorific value solid waste to produce roadbed basic materials, can solve environmental problems, achieve simple process, reduce fuel consumption, and realize the effect of resource utilization

Pending Publication Date: 2021-07-20
LANZHOU ENG & RES INST OF NONFERROUS METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing roadbed base materials from low calorific value solid wastes, so as to solve the environmental problems caused by the random stacking of low calorific value solid wastes, and also to provide low calorific value solid wastes for scale, resource utilization, High-value utilization provides a new way

Method used

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  • Method for producing roadbed base material from low-calorific-value solid waste

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The raw material used is oil shale semi-coke, including the following components in mass percentage: moisture 10%, organic matter 25%, Al 2 o 3 14%, SiO 2 36%, Fe 2 o 3 6%, CaO 2%, MgO 1%, other 9%.

[0030] A method for producing roadbed basic materials from low calorific value solid waste, comprising the following steps:

[0031] A. Raw material pretreatment: A certain amount of oil shale semi-coke is air-dried after natural drying. After air-drying, the water content of the material is 5.8 wt.%, and then crushed and screened. The material discharge particle size is 1-5mm. To the powder silo for temporary storage;

[0032] B. Roasting: Add the material obtained after the treatment in step A to a roasting device, and roast it at a temperature of 400°C for 0.5h, and obtain a roasted material after roasting, and generate flue gas at about 350°C;

[0033] C. Cooling: the roasted material obtained in step B is cooled by water cooling, and a material with a temperat...

Embodiment 2

[0037] The raw material used is coal gangue, including the following mass percentage components: moisture 8%, organic matter 20%, Al 2 o 3 8%, SiO 2 41%, Fe 2 o 3 3%, CaO 10%, other 10%.

[0038] A method for producing roadbed basic materials from low calorific value solid waste, comprising the following steps:

[0039] A. Raw material pretreatment: Air-dry a certain amount of coal gangue after natural drying. After air-drying, the water content of the material is 5.6wt.%. Then, it is crushed and screened. The particle size of the material is 1-5mm. Warehouse temporary storage;

[0040] B. Roasting: add the material obtained after the treatment in step A to a roasting device, and roast it at a temperature of 500°C for 1.5h, and obtain a roasted material after roasting, and generate flue gas at about 400°C;

[0041] C. Cooling: the roasted material obtained in step B is cooled by water cooling, and a material with a temperature <60°C is obtained after cooling;

[0042]...

Embodiment 3

[0045] The raw material used is coal slag, including the following mass percentage components: moisture 7%, organic matter 10%, Al 2 o 3 30%, SiO 2 40%, Fe 2 o 3 6%, CaO 4%, other 3%.

[0046] A. Raw material pretreatment: Air-dry a certain amount of coal slag after natural drying. After air-drying, the water content of the material is 5wt.%. live;

[0047] B. Roasting: add the material obtained after the treatment in step A to a roasting device, and roast it at a temperature of 600°C for 3 hours, obtain a roasted material after roasting, and generate flue gas at about 500°C;

[0048] C. Cooling: the roasted material obtained in step B is cooled by water cooling, and a material with a temperature <60°C is obtained after cooling;

[0049] D, milling: add the material cooled in step C into the milling device and grind for 1 hour in a dry milling mode to obtain a roadbed base material with a particle size of 0.074-0.4mm;

[0050] E. After the waste heat is recovered by t...

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Abstract

The invention discloses a method for producing a roadbed base material from low-calorific-value solid wastes, belongs to the technical field of solid waste resourceful treatment, and solves the environmental problem caused by random stacking of the low-calorific-value solid wastes. The method comprises the following steps: naturally airing a certain amount of low-calorific-value solid waste, then air-drying the solid waste, and then crushing and screening the solid waste; adding the material obtained after treatment in the step A into a roasting device to be roasted, and obtaining a roasted material after roasting; cooling the roasted material obtained in the step B to obtain a material of which the temperature is less than 60 DEG C; and adding the material cooled in the step C into a grinding device, and grinding to obtain the roadbed base material. According to the invention, the low-calorific-value solid wastes are subjected to aerobic roasting, so that organic matters in the low-calorific-value solid wastes are volatilized, and residues are mainly silicon dioxide and other components, so that the low-calorific-value solid wastes can be turned into wealth as a roadbed base material, and the purpose of efficient and comprehensive utilization is achieved.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource treatment, and in particular relates to a method for producing roadbed basic materials from low calorific value solid waste. Background technique [0002] With the continuous progress of science and technology in our country, the scale of production in the industrial field has also expanded. However, a large amount of solid waste is also generated in the process of industrial production, and the secondary utilization of solid waste with low calorific value has become a problem faced by many enterprises. problem. This part of solid waste is usually stacked. Long-term storage not only takes up a lot of land resources, but also contains trace amounts of toxic elements that will pollute the environment during random stacking, bringing safety and environmental risks to enterprises. [0003] At present, there are many studies on the comprehensive utilization of solid waste with low calorif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/10C04B20/04C04B20/02C04B18/04C04B18/12
CPCC04B18/10C04B20/04C04B20/026C04B18/04C04B18/12Y02W30/91
Inventor 丁志广郭键柄张亚东
Owner LANZHOU ENG & RES INST OF NONFERROUS METALLURGY
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