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Technological method for producing high-purity low-iron aluminum sulfate by using coal ash and comprehensively utilizing coal ash

A low-iron aluminum sulfate and process method technology, applied in aluminum sulfate, cement production, aluminum-sulfur compounds and other directions, can solve the problems of high impurity content in aluminum sulfate products, many aluminum sulfate crystals, product use restrictions, etc., and achieve comprehensive utilization benefits. Significant, low-cost effects

Inactive Publication Date: 2011-06-22
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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Problems solved by technology

However, because the original fly ash did not remove iron, and the acid leaching solution did not take effective iron removal measures, resulting in high impurity components in aluminum sulfate products, the product use is limited
200810011311.2 discloses a method for preparing aluminum sulfate using fly ash, including the following steps: mechanical activation, sulfuric acid heating and pressure leaching reaction, generation of basic aluminum sulfate, adding sulfuric acid to the basic aluminum sulfate liquid, converting into aluminum sulfate solution, evaporation Concentrate, cool and crystallize to obtain aluminum sulfate crystals. This patent application pursues the goal of increasing the extraction rate of aluminum, which involves the complex process of forming the intermediate basic aluminum sulfate. The obtained aluminum sulfate crystals contain more impurities and are difficult to obtain. Preparation of high-purity low-iron aluminum sulfate products, limited popularization and application

Method used

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  • Technological method for producing high-purity low-iron aluminum sulfate by using coal ash and comprehensively utilizing coal ash
  • Technological method for producing high-purity low-iron aluminum sulfate by using coal ash and comprehensively utilizing coal ash

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Effect test

Embodiment 1

[0039] Embodiment 1: raw material fly ash is composed of: Al 2 o3 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.

[0040] 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, remove unburned black through flotation; and remove iron oxide through magnetic separation; The fly ash residue after flotation carbon and magnetic separation of iron and concentrated sulfuric acid are made 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. Heating and pressurizing the reaction for 3 hours, the highest temperature of the reaction is 240 °C; after the reaction cools down, add water according to the mass ratio of fly as...

Embodiment 2

[0044] Embodiment 2: with the fly ash in embodiment 1, ball mill 2h in ball mill, carry out mechanical activation; According to the mass ratio of fly ash and water is 1: 3, add water, fully stir, remove unburned net through flotation black; then remove the iron oxide by magnetic separation; make a mixed solution with a sulfuric acid concentration of 50% from the fly ash residue after the flotation of carbon and magnetic iron with concentrated sulfuric acid, and control the solid-liquid mixture of the fly ash and the mixed solution The ratio is 1:7, heat and pressurize the reaction for 4 hours in the acid-resistant reaction equipment, the highest temperature of the reaction is 240 ° C; The filter cake was obtained by filtration, and washed with water with a mass ratio of fly ash to water of 1:1 to obtain a crude aluminum sulfate solution. The extraction rate of aluminum analyzed was 75%.

[0045] Evaporate and concentrate the crude aluminum sulfate solution at 110°C to 1 / 10 of...

Embodiment 3

[0047] 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 black; and then remove iron oxide by magnetic separation; make a mixed solution with a sulfuric acid concentration of 80% from the fly ash residue after flotation carbon and magnetic iron separation and concentrated sulfuric acid, and control the solid-liquid concentration of fly ash and the mixed solution Ratio of 1:6, heating and pressurizing reaction in acid-resistant reaction equipment for 5h, the highest temperature of the reaction is 240°C; The filter cake was obtained by filtration, and washed with water with a mass ratio of fly ash to water of 1:2 to obtain a crude aluminum sulfate solution. The extraction rate of aluminum analyzed was 72%.

[0048] Evaporate and concentrate the aluminum sulfate crude liquid at 100°C to 1 / 10 of the origin...

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Abstract

The invention discloses a technological method for producing high-purity low-iron aluminum sulfate by using coal ash and comprehensively utilizing the coal ash, comprising the following steps of: carrying out mechanical activation, flotation decarburization, magnetic separation for deferrization, aluminum extraction with sulfuric acid, solid-liquid separation, concentration of aluminum sulfate crude liquor, organic alcohol alcoholization for acid rinse, organic alcohol alcoholization for deferrization and aluminum sulfate dewatering and drying on the coal ash to obtain the high-purity low-iron aluminum sulfate with low Fe content. The invention solves the problems on impurity removal and purification of the aluminum sulfate in the recycling process of the coal ash, simplifies the process flow, reduces the energy consumption, solves the technical problem of overlarge accumulation of secondary residue quantity, achieves high extraction ratio of aluminum contained in the coal ash, and realizes the recycling of organic alcohol and sulfuric acid and the comprehensive utilization of side products including unburnt black, magnetic iron powder, iron-containing aluminum sulfate crystals, high-silicon-dust active mineral blending materials or novel silicon-magnesium cement, and the like. The technological method has the advantages of simple process, short flow, easiness for control of a production process, high aluminum extraction ratio, low impurity content of products and stable quality.

Description

technical field [0001] The invention relates to resource utilization and comprehensive utilization of fly ash, in particular to a process for producing high-purity and low-iron aluminum sulfate 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. It is estimated that by 2020, the national fly ash accumulation 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 to deal with fly ash is landfill, which cannot fundamentally solve the pollution caused by fly ash to the environment, and also greatly wastes this useful secondary resource. In terms of chemical composition, fly ash is a medium-grade aluminum ore ric...

Claims

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Application Information

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IPC IPC(8): C01F7/74B09B3/00C09C1/48C09C1/62C04B7/14C04B9/00
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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