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Method for producing alumina and white carbon black by utilizing red mud and flyash

A technology for fly ash and alumina, which is applied in the preparation of alumina/hydroxide, silica, silica, etc., can solve the problem of no alumina and silica, and achieve low production cost and simple process flow. , the effect of reducing emissions

Inactive Publication Date: 2010-11-24
HENAN ENERGY AND CHEMICAL INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] After reviewing the literature, there are no literature reports at home and abroad that use red mud and fly ash as the main raw materials to produce alumina and white carbon black

Method used

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  • Method for producing alumina and white carbon black by utilizing red mud and flyash
  • Method for producing alumina and white carbon black by utilizing red mud and flyash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 5g of fly ash, the main chemical composition of fly ash: Al 2 o 3 : 21.6%, SiO 2 : 47.12%, Fe 2 o 3 : 4.82%, CaO: 5.5%, red mud 6.7g, main chemical composition of red mud: Al 2 o 3 : 21.6%, SiO 2 : 15.96%, Fe 2 o 3 : 14.92%, CaO: 23.00%, Na 2 O: 8.0%. Add 0.5g of NaOH and calcining at 800°C for 60 minutes. Leach with hydrochloric acid, the concentration is 10%, and the leaching time is 30 minutes, and the solution and residue are obtained by filtration. The main component of the residue is SiO 2 , washed with water, filtered and calcined to obtain white carbon black. The acid leaching solution and the water washing solution of the acid residue are concentrated and crystallized. Thermally decompose the crystalline material, the heating temperature is 500°C, and at the same time recover hydrochloric acid for recycling. The thermally decomposed products are washed with water to recover sodium chloride and calcium chloride, then add NaOH to adjust the pH v...

Embodiment 2

[0027] The components of fly ash and red mud used are the same as those in Example 1. Take 5 g of fly ash and 13 g of red mud, add 1.0 g of NaOH, and calcining at 790° C. for 25 minutes. When leaching with hydrochloric acid, the concentration is 20%, the leaching time is 30 minutes, and the solution and residue are obtained by filtration. The main component of the residue is SiO 2 , washed, filtered and calcined to obtain white carbon black. The acid leaching solution and the water washing solution of the acid residue are concentrated and crystallized. Thermally decompose the crystalline material, the heating temperature is 500°C, and at the same time recover hydrochloric acid for recycling. The thermally decomposed product is washed with water, sodium chloride and calcium chloride are recovered, and NaOH is added to adjust the pH value to remove iron, calcium, magnesium and other impurities to obtain a pure sodium aluminate solution, which is decomposed by adding aluminum h...

Embodiment 3

[0029] Take 5g of fly ash, the main chemical composition of fly ash: Al 2 o 3 : 25.9%, SiO 2 : 46.15%, Fe 2 o 3 : 6.85%, CaO: 8.0%, red mud 10g, main chemical composition of red mud: Al 2 o 3 : 23.15%, SiO 2 : 18.90%, Fe 2 o 3 : 10.15%, CaO: 21.55%, Na 2 O: 9.1%, add NaOH 0.5g, calcining temperature 800°C, time 120 minutes. When leaching with hydrochloric acid, the concentration is 23%, the leaching time is 45 minutes, and the solution and residue are obtained by filtration. The main component of the residue is SiO 2 , washed, filtered, and calcined to obtain 4.0 g of white carbon black. The acid leaching solution and the water washing solution of the acid residue are concentrated and crystallized. Thermally decompose the crystalline material, the heating temperature is 500°C, and at the same time recover hydrochloric acid for recycling. The thermally decomposed product is washed with water to recover sodium chloride and calcium chloride, and then NaOH is added to...

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Abstract

The invention discloses a method for producing alumina and white carbon black by utilizing red mud and flyash, which is characterized by taking the flyash and the red mud as the raw materials, fully utilizing the resources of Al2O3, SiO2 and Na2O in the flyash and the red mud, mixing the flyash and the red mud with sodium hydroxide or sodium carbonate according to certain proportion and preparing the alumina and the white carbon black through calcining, acid leaching, concentrating, crystallizing, thermal decomposition, water washing, seed precipitation, roasting, etc. The acid in the process is recycled and the waste residues can be used as the raw materials of the cement and ironmaking. The method realizes changing wastes into valuables and changing harm into valuables and reduces the pollution of the red mud and the flyash to the environment. China is short of alumina resources. The development and utilization of the flyash and the red mud lay the foundation for sustainable development of the aluminum industry in China. The method is a new breakthrough in red mud resource utilization, is simple in the process flow of producing the alumina and the white carbon black, utilizes the wastes and is low in production cost.

Description

Technical field: [0001] The invention relates to a method for producing alumina and white carbon black, in particular to a method for producing alumina and white carbon black with red mud and fly ash as main raw materials. Background technique [0002] Fly ash is a solid waste discharged from thermal power plants. my country is a country where coal is the main energy source. Every year, more than 500 million tons of fly ash are discharged from coal-fired power plants, which has a certain impact on the ecological environment. Fly ash A large number of scientific and technological workers at home and abroad have done a lot of work, mainly in building materials. In recent years, research on the use of high-alumina fly ash to produce alumina and white carbon black has risen rapidly in China. Literature and patents in this area more. [0003] Red mud is solid waste discharged from alumina production plants. my country is a major producer of alumina. The production capacity of alum...

Claims

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Application Information

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IPC IPC(8): C01F7/30C01B33/12
Inventor 李伍成丁建础贾金才张秀全王占修李宗耀刘宏建蒋元力赵东峰李雪梅陈辉
Owner HENAN ENERGY AND CHEMICAL INDUSTRY
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