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Process method for ultra-high purity alumina preparation by utilizing coal ash and comprehensive utilization of ultra-high purity alumina

An ultra-high-purity, process-based technology, applied in the field of fly ash production of ultra-high-purity alumina and its comprehensive utilization, can solve the problems of large energy consumption and resource consumption, high production costs, and many process links, and achieve energy consumption And the effect of large resource consumption, high iron removal efficiency, and many process links

Inactive Publication Date: 2012-07-18
内蒙古昶泰资源循环再生利用科技开发有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the aforementioned patent application, the intermediate γ-Al through which metallurgical grade alumina passes 2 o 3 The purification process of the company is handled by the Bayer method, that is, the aluminum sulfate crystal is calcined once to obtain the intermediate γ-Al 2 o 3 , and then through alkali dissolution, sorting, filtration, washing, and secondary calcination to obtain metallurgical grade α-Al 2 o 3 , but the process is complicated, there are many process links, there are disadvantages such as large energy consumption and resource consumption, and high production costs, and it is difficult to obtain ultra-high-purity alumina, so it is not easy to promote

Method used

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  • Process method for ultra-high purity alumina preparation by utilizing coal ash and comprehensive utilization of ultra-high purity alumina
  • Process method for ultra-high purity alumina preparation by utilizing coal ash and comprehensive utilization of ultra-high purity alumina

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Experimental program
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Effect test

Embodiment 1

[0049] Embodiment 1: raw material fly ash is composed of: Al 2 o 3 Content 37.7%, Fe 2 o 3 Content 4.38%, CaO content 3.74%, MgO content 0.54%, SiO 2 The content is 49.9%, and the loss on ignition is 1.92%. The raw fly ash can also use other components and their corresponding amounts.

[0050] Mill the fly ash in a ball mill for 1 hour to perform mechanical activation; add water according to the mass ratio of fly ash to water of 1:3, fully stir, and remove unburned carbon through flotation; then remove iron oxide through magnetic separation; The fly ash residue after flotation carbon removal and magnetic separation iron removal and concentrated sulfuric acid are formulated into a mixed solution with a sulfuric acid concentration of 40%. The solid-liquid ratio of the fly ash and the mixed solution is controlled to be 1:8. Heat and pressurize the reaction equipment for 3 hours, the highest temperature of the reaction is 240 ° C; after the reaction cools down, add water acco...

Embodiment 2

[0056] Embodiment 2: Press the obtained aluminum sulfate crude liquid into a resin column equipped with JK008 macroporous cationic resin with a corrosion-resistant pump to remove iron. The treatment temperature is 90° C., and the flow rate of the aluminum sulfate crude liquid is 2 times the volume of the resin during processing. / h to obtain a low-iron aluminum sulfate solution.

[0057] When the macroporous cationic resin is adsorbed and saturated, the resin can recover its adsorption capacity through elution and regeneration. The elution conditions are as follows: the eluent adopts hydrochloric acid with a concentration of 8%, the elution temperature is 30° C., and the flow rate of hydrochloric acid is 2 times the resin volume / h, a total of 1 times the resin volume of hydrochloric acid was used for elution; the concentration of 8% hydrochloric acid was used for regeneration, the temperature was 20°C, and the flow rate of hydrochloric acid was 2 times the resin volume / h, a tot...

Embodiment 3

[0060] Embodiment 3: with the fly ash in embodiment 1, ball mill 3h in ball mill, carry out mechanical activation; According to the mass ratio of fly ash and water is 1: 2, add water, fully stir, remove unburned net through flotation carbon; then remove iron oxide through magnetic separation; the fly ash residue after flotation carbon removal and magnetic separation iron removal and concentrated sulfuric acid are made into a mixed solution with a sulfuric acid concentration of 80%, and the concentration of fly ash and the mixed solution is controlled. The solid-liquid ratio is 1:6, and the heating and pressurizing reaction is carried out in the acid-resistant reaction equipment for 5 hours, and the maximum temperature of the reaction is 240°C; , to obtain a filter cake by suction filtration, and wash it with water with a mass ratio of fly ash to water of 1:2 to obtain a crude aluminum sulfate solution with a pH value of 1. The extraction rate of aluminum analyzed was 74%.

[...

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Abstract

The invention discloses a process method for ultra-high purity alumina preparation by utilizing coal ash and comprehensive utilization of ultra-high purity alumina. In the process method, mechanical activation, flotation decarbonization, magnetic separation iron removal sulfuric acid aluminum lixiviation, solid-liquid separation, resin absorption iron removal, low-iron aluminum sulfate concentration, organic alcohol alcoholization acid washing, aluminum sulfate dehydration drying and aluminum sulfate high-temperature calcination are carried out on the coal ash so as to obtain ultra-high purity alpha-Al2O3, wherein the content of the Fe2O3 in the ultra-high purity alpha-Al2O3 is less than 2 ppm. By using the process method, the complicated purification problem that intermediate aluminum sulfate in the process of coal ash reclamation is necessarily subjected to a called Bayer circulation process is avoided, thereby simplifying the process flow, reducing the energy consumption, reducing the resource consumption and solving the technical problem of over-large secondary residue quantity accumulation. The process method has the advantages that the extraction efficiency is high, and the circulation recovery of organic alcohol and sulfuric acid and comprehensive utilization of byproducts such as resin and the like are achieved. In the invention, the process is simple, the process flowis short, the production process is easy to control, the content of the impurity in the product is low, and the quality of the product is stable.

Description

technical field [0001] The invention relates to a process method for resource recovery and comprehensive utilization of fly ash, in particular to a process method for producing ultra-high-purity alumina from fly ash and its comprehensive utilization. Background technique [0002] Fly ash is the solid residue left after coal combustion in coal-fired boilers. It mainly comes from by-products of coal-fired power plants. For every ton of coal burned, 230kg of fly ash will be produced. According to incomplete statistics, the national fly ash accumulation amounted to 2.5 billion tons in 2007, and it is estimated that by 2020 the national fly ash accumulation amount will reach 5-6 billion tons. The massive accumulation of fly ash not only occupies a large amount of land resources, but also causes serious pollution to air, water and soil. The traditional way of dealing with fly ash is landfill, but it cannot fundamentally solve the pollution caused by fly ash to the environment. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/32C01F7/74C01G49/10B09B3/00C09C1/48C09C1/62C04B7/14C04B9/00
CPCY02P40/10
Inventor 余红发武金永吴成友麻海燕王梅娟董金美李颖李成栋
Owner 内蒙古昶泰资源循环再生利用科技开发有限责任公司
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