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Technology for preparing hydrated sodium aluminosilicate by utilizing high-alumina coal gangue and fly ash alkali soluble desiliconization

A technology of hydrated sodium aluminosilicate and high-alumina coal gangue, which is applied in the field of extracting alumina from high-alumina fly ash and high-alumina coal gangue, can solve the problems of high production cost, difficult promotion, large sodium hydroxide, etc., and achieve improvement Technological and economic feasibility, improvement of economic benefits, and effect of reducing emissions

Inactive Publication Date: 2011-08-31
昊青薪材(北京)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation technology either simply prepares the alumina, discards other components in the material directly, or makes other components into products such as cement with low added value, such as application numbers 91110937.4, 94113062.2, 02107204.3 , 02116060.0, 200810051316.8, 200810183520.5 and 200810034212.6 patented technologies are like this; what is more, although the SiO 2 The components are made into products such as white carbon black, but the process is complicated, the process is long, and the cost is high, so it is difficult to promote. For example, the invention patent with application number 200510088308.7
The invention patent with the application number of 200510052016.8 "A New Method for Utilizing Coal Gangue" discloses a technical solution that a mixed solution of aluminum hydroxide and sodium silicate is obtained by stirring and reacting calcined coal gangue with sodium hydroxide at high temperature and high pressure. This method requires high temperature and high pressure conditions, and consume a large amount of sodium hydroxide, the production cost is high

Method used

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  • Technology for preparing hydrated sodium aluminosilicate by utilizing high-alumina coal gangue and fly ash alkali soluble desiliconization
  • Technology for preparing hydrated sodium aluminosilicate by utilizing high-alumina coal gangue and fly ash alkali soluble desiliconization
  • Technology for preparing hydrated sodium aluminosilicate by utilizing high-alumina coal gangue and fly ash alkali soluble desiliconization

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Experimental program
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Effect test

Embodiment 1

[0025] Experimental raw material: high-alumina coal gangue from a certain place

[0026] Table 1 Analysis results of chemical composition of high-alumina coal gangue samples (w B %)

[0027]

[0028] The above-mentioned high-alumina coal gangue samples were taken, placed in a box-type electric furnace, and calcined at 1000° C. for 3 hours, and the calcined products were ground to -325 mesh > 90%. Take 1000 g of calcined high-alumina coal gangue samples, 2 L of sodium hydroxide lye with a concentration of 4 mol / L, place them in the reactor and mix them evenly, open the instrument after sealing, and heat up to 95°C, keep stirring for 4 hours under this condition, filter after the reaction, and wash the filter cake with 2L of industrial water for 3 times to obtain 3.36L of sodium silicate filtrate (used to prepare inorganic silicon compounds). The chemical composition analysis results are shown in Table 2 Obtain hydrated sodium aluminosilicate material 990g, its X-ray powder...

Embodiment 2

[0035] Experimental raw material: high-alumina fly ash from a certain place

[0036] Table 4 Analysis results of chemical composition of high alumina fly ash samples (w B %)

[0037]

[0038] Grind the above-mentioned high-alumina coal gangue sample to -325 mesh > 90%, take 2000g of finely ground high-alumina fly ash and 4L of lye with a concentration of 6mol / L, put it in the reaction kettle and mix evenly, seal it and open the instrument. Under the condition of continuous stirring (150r / min), the temperature was raised to 100°C, and the stirring was continued for 3 hours under this condition. After the reaction was completed, it was filtered, and the filter cake was washed 3 times with 4L of industrial water to obtain 652L of sodium silicate filtrate (used to prepare inorganic silicon compound), its chemical composition analysis results are shown in Table 5; obtain 1800g of hydrated sodium aluminosilicate material, and its X-ray powder diffraction pattern is shown in im...

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Abstract

The invention discloses a technology for preparing hydrated sodium aluminosilicate by utilizing high-alumina coal gangue and fly ash alkali soluble desiliconization, and the technology provided by the invention comprises a high-alumina coal gangue alkali soluble desiliconization technology and a high-alumina fly ash alkali soluble desiliconization technology. The high-alumina coal gangue is activated in a roasting way and is leached by alkali liquor, solid-liquid separation is carried out, and the filter liquor is sodium silicate solution which can be used for preparing an inorganic silicon compound; and a filter cake is a hydrated sodium aluminosilicate material which can be used as a raw material for producing aluminum oxide. The high-alumina fly ash can be formed at a high temperature,the activating working procedure in a roasting way can be omitted, and the alkali soluble desiliconization can be directly performed. The technology is characterized in that the technical process is simple, the obtained hydrated sodium aluminosilicate material is taken as the raw material for producing the aluminum oxide, the hydrated sodium aluminosilicate is higher in aluminum-silicon mass ratio and higher in sodium oxide mass fraction, the alkali matching quantity and the silicon-calcium tailings discharging quantity of the process for preparing the aluminum oxide by utilizing the high-alumina coal gangue or the high-alumina fly ash can be obviously reduced, and the economic benefit of the technical process for preparing the aluminum oxide by utilizing the high-alumina coal gangue or the high-alumina fly ash can be improved.

Description

technical field [0001] The invention relates to the field of extracting alumina from high-aluminum coal gangue and high-aluminum fly ash, in particular to a process for preparing hydrated sodium aluminosilicate through alkali-soluble desiliconization of high-aluminum coal gangue and high-aluminum fly ash. Background technique [0002] my country's coal and electric power industries discharge a large amount of solid waste, of which high-alumina coal gangue and high-alumina fly ash occupy a large proportion. The stacking of these wastes not only affects the surface landscape, but also causes serious harm to the environment. At present, the use of high-alumina fly ash and high-alumina coal gangue to prepare alumina has become one of the hotspots for the resource utilization of such solid waste. The existing preparation technology either simply prepares the alumina, discards other components in the material directly, or makes other components into products such as cement with l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 苏双青邹丹马鸿文
Owner 昊青薪材(北京)技术有限公司
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