Technology utilizing waste solids to prepare ceramic particles used as soilless culture substrates

A technology for soilless culture substrate and solid waste is applied in the field of preparing soilless culture substrate ceramsite, which can solve the problems of unfavorable social sustainable development, low utilization rate of solid waste discharged from industrial and mining, environmental pollution, etc., and achieves ensuring chemical stability. and buffer capacity, the effect of protecting social and environmental benefits

Inactive Publication Date: 2015-12-23
BAOTOU ZHENGTANG ENVIRONMENTAL PROTECTION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The utilization rate of solid waste discharged from industrial and mining in my country is very low. Its stacking and landfill not only take up a

Method used

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  • Technology utilizing waste solids to prepare ceramic particles used as soilless culture substrates
  • Technology utilizing waste solids to prepare ceramic particles used as soilless culture substrates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The mixed-grade fly ash dry ash discharged from Donghua thermal power plant in Baotou City was taken, and its chemical composition was determined, which contained 56% SiO 2 , 32%Al 2 o 3 , 4.8% Fe 2 o 3 , 2.5% GaO, 0.7% Na 2 O, 0.5%K 2 O, 0.3%SO 3 , 0.7% loss on ignition. The coal gangue from the coal washing plant in the Shiguai Mining Area of ​​Baotou City was taken, and its chemical determination showed that it contained 46% SiO 2 , 29%Al 2 o 3 , 5.2% Fe 2 o 3 , 1.7% CaO, 0.6% Na 2 O, 0.9%K 2 O, 0.7%SO 3 , 15% loss on ignition.

[0030] Take fly ash about 1m 3 (According to bulk density 850~1000kg / m 3 ), coal gangue powder is 0.05m 3 , first crush it to a powder with a particle size of 60-80um and keep it dry. Use dry powder stirring to stir the raw material powder evenly, double-axis stirring to nucleate, roll into balls, pendulum cloth, roller sieving to obtain wet material balls with 5-10mm particle size gradation and surface finish that meet the...

Embodiment 2

[0033]Take 0.52m of mixed-grade fly ash from Baotou Donghua Thermal Power Plant 3 , coal gangue (clay ratio 5%) of coal washing plant in Shiguai mining area 0.05m 3 , the sludge of Baotou Donghe Water Purification Plant (45% after dehydration) 0.495m 3 , using the same dynamic sintering process as in Example 1 to prepare ceramsite with a particle size of 5-10 mm, the pH of the prepared ceramsite is 6.9, the bulk density is 1.0g / cm3, the total porosity is 82%, and the cylinder compressive strength is 5MPa.

Embodiment 3

[0035] Take fly ash about 1m 3 (According to bulk density 850~1000kg / m 3 ), coal gangue powder is 0.05m 3 , first crush it to a powder with a particle size of 60-80um and keep it dry, then add 2-4% aluminum powder (such as crushed with aluminum scraps and ground into a particle size of 60-80 mesh sieve) as Foaming agent. Use dry powder stirring to stir the raw material powder evenly, biaxially stir to nucleate, and use a high-speed ball forming machine to generate wet material balls with a gradation of 2 to 5 mm. After being screened and transported to the rotary kiln drying preheating furnace (200-500°C) for drying and preheating, it is roasted in a two-section heating roasting furnace (500-1250°C). After constant temperature, it is finally pushed into the cooling furnace for slow cooling. During the sintering process, it rotates at a constant speed. During the process of rotary throwing, various gases accelerate volatilization and cause the volume of ceramsite to expand. ...

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Abstract

The invention relates to a technology utilizing waste solids to prepare ceramic particles used as the soilless culture substrates. The technology comprises the following steps: (1) grinding main raw materials and internal combustion agent into powder with a particle size of 60 to 80 [mu]m, and maintaining a dry state, wherein the main raw material is one or more of fly ash, city sludge, lake/river mud, industrial slag, electrolytic ash, tailings, and red mud, and the internal combustion agent is one or more of coal gangue, agricultural straw, and saw dust; (2) weighing 80 to 95 parts by weight of waste solid powder and 5 to 10 parts by weight of internal combustion agent powder, evenly mixing the powder, adding water into the evenly-mixed powder, keeping on stirring to form crystal nucleus accounting for 10 to 12% of the total weight, balling, performing roll-screening, and sintering to obtain the ceramic particles. Waste solids are taken as the raw material, then the components are scientifically and reasonably compounded, and finally inorganic substrate (ceramic particle) for soilless culture is produced by a sintering technology. The provided technology can save the energy and reduce the discharge, and is capable of replacing the conventional technical scheme using non-renewable resources to produce ceramic particles.

Description

technical field [0001] The invention belongs to the technical field of soilless cultivation, and in particular relates to a process for preparing soilless cultivation substrate ceramsite by using solid waste. Background technique [0002] Soilless cultivation is a new type of cultivation method, which has become an important part of protected gardening and the main form of factory production of horticultural crops. It has been widely used in flower cultivation this year. Compared with traditional soil cultivation, it saves water, fertilizer and labor. The soilless cultivation substrate is a growth medium that can provide plants with a stable and coordinated structure of water, air and fertilizer. In addition to supporting and fixing plants, it more importantly acts as a "transfer station", allowing plant roots to select and absorb nutrient solutions, nutrients, and water as needed. [0003] Ceramsite is a kind of inorganic substrate for soilless cultivation. It is now commo...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/14C04B35/622A01G31/00
CPCY02P60/21
Inventor 范峪铭王乃俊魏秀玲
Owner BAOTOU ZHENGTANG ENVIRONMENTAL PROTECTION IND
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