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New method for resource comprehensive utilization of red mud and fly ash

A technology of fly ash and resource utilization is applied in the field of comprehensive utilization of polyaluminum ferric chloride and silicon dioxide, industrial waste red mud and fly ash, and achieves simple operation, reduced manufacturing process difficulty and high separation efficiency. Effect

Inactive Publication Date: 2012-02-08
孙建之
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Comprehensive consideration of the utilization of red mud and fly ash, processing red mud and fly ash at the same time, the production of flocculant polyaluminum ferric chloride has not been reported

Method used

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  • New method for resource comprehensive utilization of red mud and fly ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Main component content of red mud (mass fraction): Fe 2 O 3 : 26.0%; Al 2 O 3 :18.0%; SiO 2 :17.0%; main component content of fly ash (mass fraction): Fe 2 O 3 : 5.0%; Al 2 O 3 : 20.0%; SiO 2 : 50.0%.

[0029] Weigh 100g fly ash and 7g Na 2 CO 3 Mix, activate at 800°C for 1.0h, and pulverize to 0.1-1.0μm after cooling. Put the activated fly ash into a glass container, add 500mL 6mol·L -1 , React for 8 hours at 80°C and stirring speed 400 rpm (revolutions per minute), and filter to obtain 450 mL of dissolving liquid 1 and 70 g of filter residue 1. Put 20g of red mud into a glass container, add 100mL 6mol·L -1 , React for 6 hours at 80°C and stirring rate 400 rpm (revolutions per minute), and filter to obtain 80 mL of eluate 2 and 12 g of filter residue 2. Transfer 400 mL of dissolution solution 1 to another glass container, and slowly add Na at 65°C 2 CO 3 The solution, until the pH value of the solution is 2.5, and then keep it for 1 hour; add the dissolving liquid 2 to th...

Embodiment 2

[0032] The main component content of red mud (mass fraction): Fe 2 O 3 : 26.0%; Al 2 O 3 :18.0%; SiO 2 :17.0%; main component content of fly ash (mass fraction): Fe 2 O 3 : 5.0%; Al 2 O 3 : 20.0%; SiO 2 : 50.0%.

[0033] Weigh 100g fly ash and 7g Na 2 CO 3 Mix, activate at 800°C for 1.0h, and pulverize to 0.1-1.0μm after cooling. Put the activated fly ash into a glass container, add 500mL 6mol·L -1 , React for 6 hours at 780°C and stirring speed 400 rpm (revolutions per minute), and filter to obtain 460 mL dissolving liquid 1 and 75 g filter residue 1. Put 20g of red mud into a glass container, add 100mL 6mol·L -1 , Reacting for 6 hours at 70°C and stirring rate of 400 rpm (revolutions per minute), and filtering to obtain 80 mL of eluate 2 and 13 g of filter residue 2. Transfer 400mL dissolution solution 1 to another glass container, and slowly add Na at 70°C 2 CO 3 The solution, until the pH value of the solution is 3.0, and then keep it for 1 hour; add the dissolving liquid 2 t...

Embodiment 3

[0036] The main component content of red mud (mass fraction): Fe 2 O 3 : 25.0%; Al 2 O 3 :17.0%; SiO 2 :16.0%; main component content of fly ash (mass fraction): Fe 2 O 3 : 4.0%; Al 2 O 3 : 21.0%; SiO 2 : 50.0%.

[0037] Weigh 100g fly ash and 7g Na 2 CO 3 Mix, activate at 850°C for 1.0h, and pulverize to 0.1-1.0μm after cooling. Put the activated fly ash into a glass container, add 500mL 6mol·L -1 , React for 6 hours at 750°C and a stirring rate of 500 rpm (revolutions per minute), and filter to obtain 450 mL of eluate 1 and 70 g of filter residue 1. Put 15g of red mud into a glass container, add 75mL 6mol·L -1 , React for 6 hours at 80°C and stirring speed 400 rpm (revolutions per minute), and filter to obtain 60 mL of dissolution liquid 2 and 9 g of filter residue 2. Transfer 400 mL of dissolution solution 1 to another glass container, and slowly add Na at 65°C 2 CO 3 The solution, until the pH value of the solution is 2.5, and then keep it for 1 hour; add the dissolving liqui...

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Abstract

The invention discloses a new method for resource comprehensive utilization of red mud and fly ash, and relates to a comprehensive utilization of industrial waste, specifically to a preparation method for a flocculating agent of aluminum ferric chloride and white carbon black. The method comprises the following steps: (1) acid leaching: the red mud and the activated fly ash are adopted as raw materials, and react with HCl, wherein the leaching temperature is 70-90 DEG C, a solid-liquid ratio is 10:1-10:3, the HCl concentration is 3-6 mol.L<-1>, the leaching time is 4-10 hours; (2) polymerization: Na2CO3 is added to a dissolution solution 1 to carry out telomerization, a dissolution solution 2 is added to the dissolution solution 1 until the dissolution solution 1 is stable, then the polymerization reaction is performed to obtain the polyaluminum ferric chloride, wherein the temperature is 60-70 DEG C, the pH value is 2.5-3.0, the aging time is 12-24 hours; (3) white carbon black preparing: a NaOH solution is adopted to carry out alkali dissolution to dissolve the filter residue, then treatments of acidification and calcination are performed to obtain the powder SiO2, wherein the alkali dissolution temperature is 80-100 DEG C, the time is 4-8 hours.

Description

Technical field [0001] The invention relates to the comprehensive utilization of industrial waste red mud and fly ash, in particular to the technical field of production of inorganic flocculants and white carbon black, in particular to a method for preparing polyaluminum ferric chloride and silica by using red mud and fly ash . Background technique [0002] Red mud is the residue produced in the process of refining alumina from bauxite. It is called red mud because it contains a large amount of iron oxide and is red. It is a strong alkaline and harmful residue. Its storage not only takes up a lot of land and consumes more maintenance costs, but also causes serious pollution of the environment, atmosphere and groundwater sources. my country only discharges 500,000 tons of red mud each year from Shandong, my country's total discharge amount is more than 5 million tons, and the accumulated red mud stock has reached 50 million tons. At present, the utilization rate of red mud is on...

Claims

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Application Information

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IPC IPC(8): C01G49/10C01B33/12B09B3/00C02F1/52
Inventor 孙建之
Owner 孙建之
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