Method for producing superfine white carbon black, ferric hydroxide and aluminum oxide by using coal ash

A technology of iron hydroxide and fine white carbon black, applied in the directions of alumina/aluminum hydroxide, iron oxide/iron hydroxide, aluminum fluoride, etc., can solve the problem of low output of water treatment agent, inability to industrialize production, and single cost of material higher question

Inactive Publication Date: 2013-07-10
宫毅 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even so, although certain results have been achieved, its development and utilization level is limited to the building materials industry, and the utilization of fly ash is very low, less than 5%, which is only in the initial stage of development and utilization; Compared with the United States, which has a high level of development and utilization, there is a big difference
Due to problems such as the inability to open Al~Fe~Si bonds during leaching, the output of water treatment agents is low, the product cost is too high and the developed products are single, resulting in the inability to carry out industrial production.
It can be seen from this that th

Method used

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  • Method for producing superfine white carbon black, ferric hydroxide and aluminum oxide by using coal ash

Examples

Experimental program
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Effect test

experiment example 1

[0100] 1. Grinding: Grinding the fly ash to a grinder to a size below 200 microns to a dipping process;

[0101] 2. Extraction of aluminum and iron:

[0102] 2.1 First immersion: Put 100g of ground fly ash into a beaker, then add 700ml of hot water at 60°C according to the ratio of fly ash to 2Mol acid leaching solvent of 1:8, and then add 700ml of hot water at 60°C, then transfer the liquid-filled beaker into In the water bath filled with water, after adding 100ml 93% concentrated sulfuric acid under heating and stirring, the temperature of the solution in the beaker rises rapidly, at this time, add 22g of anhydrous NaF Afterwards, heating and leaching under stirring for 6 hours and then proceeding to the middle storage 1 process, the stirring speed is: 200 rpm; the temperature of the water bath is set at 95°C,

[0103] 2.2 Storage 1: Put the beaker with the mixed solution after immersion in the previous step outside the water bath for 10 minutes, and you can see the ash in ...

experiment example 2

[0146] 1. Grinding: same as in Experimental Example 1;

[0147] 2. Extraction of aluminum and iron:

[0148] 2.1 First immersion: Put 100g of ground fly ash into a beaker, then add 730ml of hot water at 60°C according to the ratio of fly ash to 3Mol acid leaching solvent of 1:9, and then add 730ml of hot water at 60°C, then press the After adding 16g of anhydrous NaF at a ratio of 100:16 by weight, move the liquid-filled beaker into a water bath filled with oil, and then add 170ml of 93% concentrated sulfuric acid according to the aforementioned solid-to-liquid ratio of concentrated sulfuric acid under heating and stirring. , the temperature of the solution in the reaction kettle rises rapidly, and the temperature of the preparation solution is controlled at about 120°C under stirring and heating leaching. After continuous leaching for 6 hours, it will go to the middle storage 1 process. The stirring speed is: 250 rpm; Hourly water replenishment 50ml;

[0149] 2.2 Storage 1:...

experiment example 3

[0189] 1. Grinding: same as in Experimental Example 1;

[0190] 2. Extraction of aluminum and iron:

[0191] 2.1 First immersion: Put 100g of ground fly ash into a beaker, and then add 60% of water according to the ratio of fly ash to 4Mol acid leaching solvent of 1:10 solid-to-liquid ratio. 。 After 770ml of C hot water, move the liquid-filled beaker into a water bath filled with oil, add 230ml of 93% concentrated sulfuric acid under heating and stirring, and the temperature of the solution in the beaker rises rapidly. After adding 22g of anhydrous NaF at a weight ratio of 100:22, heating and leaching under stirring for 6 hours and then proceeding to the middle storage 1 process, the stirring speed is: 230 rpm; the temperature of the water bath is set at 120°C;

[0192] 2.2 Storage 1: the same as in Experimental Example 1;

[0193] 2.3 Filtration and washing: same as in Experimental Example 1;

[0194] 2.4 Crystallization and overflow: the same as in Experimental Example 1;...

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Abstract

The invention belongs to a resourceful, economic and fine utilization method of coal ash, and relates to a method for producing superfine white carbon black, ferric hydroxide and aluminum oxide by using coal ash. The method comprises the following steps of: with the coal ash as a raw material and a sulfuric acid and caustic soda solution as a solvent, grinding the coal ash, heating to assist in dissolving the coal ash, carrying out acid leaching on the coal ash, and then, filtering and cleaning the coal ash to obtain a filtrate, wherein the filtrate is used for preparing the ferric hydroxide and the aluminum oxide, a filter cake obtained through leaching and filtering is used for preparing the superfine white carbon black, and a fluoride-contained gas generated through leaching is used for absorbing and preparing an AlF3 product. By using the method, the problem that the industrial application can not be realized because the traditional coal ash leaching way is low in useful substance leaching rate is better solved fundamentally, and the total useful substance dissolution rate of the coal ash can be increased from 15-20% to 75-85%, so that resourceful utilization, economic and fine utilization, product diversification and higher additional value of the coal ash can be realized.

Description

technical field [0001] The present invention belongs to the method of fly ash resource utilization and economic refinement; in particular, it uses fly ash produced in thermal power generation and heat supply production as raw material to produce ultrafine hydrated silica (i.e. ultrafine white carbon black ), ferric hydroxide, alumina and aluminum trifluoride products. Background technique [0002] Fly ash is the product of pulverized coal combustion in thermal power generation and heating production. Its main available substances are Al, Fe, Si. Of which SiO 2 The highest content is 40% to 60%, which is 20% to 30% of alumina and 4% to 20% of iron oxide. According to the test results, it is not difficult to see that it can be used as a good product resource. my country is a big country of thermal power generation and heating supply. With the rapid development of thermal power generation and heating industry, the annual production of fly ash is also increasing day by day; ...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01G49/02C01F7/02C01F7/50
Inventor 宫毅吴岩博宫雪莲
Owner 宫毅
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