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A method for collaborative resource utilization of carbide slag and fly ash

A technology of fly ash and carbide slag, applied in chemical instruments and methods, inorganic chemistry, aluminum compounds, etc., can solve the problems of low comprehensive utilization efficiency of resources, low added value of products, and high requirements for equipment materials, so as to facilitate industrialization promotion , low equipment requirements, uniform particle effect

Active Publication Date: 2016-01-13
陕西龙湘科创节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the selection of highly oxidizing and corrosive concentrated sulfuric acid and fly ash for roasting, the requirements for equipment materials are high, and the roasting process is prone to produce SO 2 and SO 3 Mixed gas has caused environmental pollution
[0005] In short, the existing resources utilization of calcium carbide slag and fly ash has problems such as low comprehensive utilization efficiency of resources, low added value of products, and secondary pollution easily.

Method used

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  • A method for collaborative resource utilization of carbide slag and fly ash
  • A method for collaborative resource utilization of carbide slag and fly ash
  • A method for collaborative resource utilization of carbide slag and fly ash

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Embodiment 1

[0039] Al in the main chemical composition in the fly ash in this embodiment 2 o 3 , SiO 2 , TFe, loss on ignition accounted for 28.08%, 52.65%, 5.1% and 17.32% respectively; Ca(OH) in the chemical composition of carbide slag 2 Content 90%.

[0040] The method for collaborative resource utilization of calcium carbide slag and fly ash of the present invention, its technological process is as follows figure 1 shown, including the following steps:

[0041] 1) Fly ash magnetic separation deferrization pretreatment, the current intensity of the high gradient magnetic separator is 10A, and the magnetic field intensity is 0.8T.

[0042] 2) Under the condition of 80-150°C, leaching the de-ironized fly ash with a mass fraction of 50% sulfuric acid solution for 2 hours, the total amount of sulfuric acid is calculated according to the liquid-solid ratio = 0.8 (ml / g), after the reaction is completed Filter aluminum sulfate solution and acid leaching residue.

[0043] 3) After adjust...

Embodiment 2

[0050] Al in the main chemical composition in the fly ash in this embodiment 2 o 3 , SiO 2 , TFe, loss on ignition accounted for 28.08%, 52.65%, 5.1% and 17.32% respectively; Ca(OH) in the chemical composition of carbide slag 2 Content 90%.

[0051] The method for collaborative resource utilization of calcium carbide slag and fly ash of the present invention, its technological process is as follows figure 1 shown, including the following steps:

[0052] 1) Fly ash magnetic separation deferrification pretreatment, the current intensity of the high gradient magnetic separator is 10A, and the magnetic field intensity is 1.1T.

[0053] 2) Under the condition of 80-150°C, leaching the de-ironized fly ash with a mass fraction of 60% sulfuric acid solution for 4 hours, the total amount of sulfuric acid is calculated according to the liquid-solid ratio = 1.2 (ml / g), after the reaction is completed Filter aluminum sulfate solution and acid leaching residue.

[0054] 3) After adju...

Embodiment 3

[0061] Al in the main chemical composition in the fly ash in this embodiment 2 o 3 , SiO 2 , CaO, TFe, loss on ignition accounted for 25.1%, 46.5%, 18.7%, 2.9% and 16.32% respectively; Ca(OH) in the chemical composition of carbide slag 2 Content 92%.

[0062] The method for collaborative resource utilization of calcium carbide slag and fly ash of the present invention, its technological process is as follows figure 1 shown, including the following steps:

[0063] 1) Fly ash magnetic separation deferrization pretreatment, the current intensity of the high gradient magnetic separator is 10A, and the magnetic field intensity is 1.0T.

[0064] 2) Under the condition of 80-150°C, leaching the de-ironized fly ash with a mass fraction of 60% sulfuric acid solution for 4 hours, the total amount of sulfuric acid is calculated according to the liquid-solid ratio = 1.2 (ml / g), after the reaction is completed Filter aluminum sulfate solution and acid leaching residue.

[0065] 3) Af...

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Abstract

The invention provides a method for synergic resource utilization of acetylene sludge and coal ash. The method comprises the following steps: carrying out magnetic separation, acid leaching and filtering on coal ash to obtain an aluminum sulfate solution and acidic leaching residues, carrying out evaporative concentration and cooling crystallization on filtrate to obtain an aluminum sulfate crystal; carrying out alkaline leaching and filtering on the acidic leaching residues to obtain a sodium silicate solution and alkaline leaching residues, and carrying out cleaning and activation on the acetylene sludge to prepare lime milk which is subjected to hydro-thermal synthesis with the sodium silicate solution, and drying and dehydrating to prepare active calcium silicate powder, wherein the alkaline leaching residues can be directly used for preparing building materials after being dehydrated. According to the invention, by adopting the method for producing aluminum sulfate co-production active calcium silicate through synergic resource utilization of the acetylene sludge and coal ash, high-value utilization of large quantity of industrial solid wastes can be realized, and the production added value is high; all byproducts can be recycled, zero discharge is realized, energy consumption is low, and economical efficiency and environmental protection are achieved.

Description

technical field [0001] The invention relates to a method for collaborative resource utilization of carbide slag and fly ash, in particular to a method for preparing aluminum sulfate and active calcium silicate products by using carbide slag and fly ash as raw materials. Background technique [0002] Carbide slag is the calcium carbide slag that is converted into Ca(0H) after hydrolysis of calcium carbide to obtain acetylene gas during the production process of acetylene by the calcium carbide method. 2 The waste slag as the main component also contains impurities such as silicon, aluminum iron, magnesium and calcium carbonate. Carbide slag is strongly alkaline, the quantity is huge, the transportation cost is high, and it will cause secondary pollution; if it is piled up on the spot, it will often cause serious environmental pollution to the surrounding environment, which is the focus and difficulty of clean production and resource recycling in my country . At present, only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/74C01B33/24C04B7/24
CPCC01B33/24C01F7/743C01P2004/03C01P2004/61C01P2006/12C01P2006/60C04B7/24Y02P40/10
Inventor 伍泽广
Owner 陕西龙湘科创节能环保科技有限公司
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