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Method for preparing aluminum chloride hexahydrate by using pulverized fuel ash as raw material through ferrous chloride induced crystallization

A technology of aluminum chloride hexahydrate and ferrous chloride, applied in the direction of aluminum chloride, aluminum halide, etc., can solve the problems of harsh operating conditions, high corrosion, complex and cumbersome process, etc., and reduce process cost and crystallization equipment requirements, the effect of improving economic efficiency

Inactive Publication Date: 2014-01-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It is worth noting that this process also has some disadvantages: (1) The method of solvent extraction is used to remove Fe 3+ , the process is complex and cumbersome, and the amount of solvent is large, and the cost is high; (2) Using HCl gas to crystallize aluminum chloride hexahydrate, the operating conditions are harsh, the corrosion is high, the requirements for equipment are high, and it is easy to cause environmental pollution

Method used

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  • Method for preparing aluminum chloride hexahydrate by using pulverized fuel ash as raw material through ferrous chloride induced crystallization
  • Method for preparing aluminum chloride hexahydrate by using pulverized fuel ash as raw material through ferrous chloride induced crystallization
  • Method for preparing aluminum chloride hexahydrate by using pulverized fuel ash as raw material through ferrous chloride induced crystallization

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Mix 500g of certain fly ash (see Table 1 for composition) and 26% hydrochloric acid solution at a ratio of 1:1.05, place in a 4L glass reactor equipped with a condenser, and react at 80°C for 4h. After the reaction, the leaching solution is filtered, and the filtered filter residue is washed with 0.1% hydrochloric acid for more than three times, and the filter residue is collected as a raw material for making bricks for later use. Mix the filtrate with dilute hydrochloric acid washing solution and add iron filings until the electromotive force in the solution is 770mV, making Fe 3+ All reduced to Fe 2+ . Add 0.1-0.2mol of FeCl to the reduced solution 2 Carry out evaporative crystallization at 80 ℃, control the amount of evaporating water, make the precipitated crystal be aluminum chloride hexahydrate. Solid-liquid separation was carried out by filtration, and the obtained crystals were recrystallized and washed with a nearly saturated aluminum chloride solution for m...

Embodiment 2

[0041]Mix 500g of certain fly ash (see Table 1 for composition) and 28% hydrochloric acid solution at a ratio of 1:1.10, place in a 4L glass reactor equipped with a condenser, and react at 100°C for 2h. After the reaction, the leaching solution is filtered, and the filtered filter residue is washed with 0.1% hydrochloric acid for more than three times, and the filter residue is collected as a raw material for making bricks for later use. The filtrate is mixed with dilute hydrochloric acid washing solution and a small amount of iron filings are added to make the electromotive force in the solution be 770mV, so that Fe 3+ All reduced to Fe 2+ . Add 0.1-0.2mol of FeCl to the reduced solution 2 Carry out evaporative crystallization at 90°C, control the amount of evaporated water, and make the precipitated crystals be aluminum chloride hexahydrate. Solid-liquid separation was carried out by filtration, and the obtained crystals were recrystallized and washed more than three time...

Embodiment 3

[0045] Mix 500g of certain fly ash (see Table 1 for composition) and 30% hydrochloric acid solution at a ratio of 1:1.20, place in a 4L glass reactor equipped with a condenser, and react at 120°C for 1h. After the reaction, the leaching solution is filtered, and the filtered filter residue is washed with 0.1% hydrochloric acid for more than three times, and the filter residue is collected as a raw material for making bricks for later use. The filtrate is mixed with dilute hydrochloric acid washing solution and a small amount of iron filings are added to make the electromotive force in the solution be 770mV, so that Fe 3+ All reduced to Fe 2+ . Add 0.1-0.2mol of FeCl to the reduced solution 2 Carry out evaporative crystallization at 110 DEG C, control the amount of evaporating water, make the precipitated crystal be aluminum chloride hexahydrate. Solid-liquid separation was carried out by filtration, and the obtained crystals were recrystallized and washed more than three ti...

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Abstract

The invention provides a method for preparing aluminum chloride hexahydrate by using pulverized fuel ash as a raw material through ferrous chloride induced crystallization. The method comprises the following steps: (1) batching the pulverized fuel ash and hydrochloric acid in proportions, and reacting for 1-4 hours at the temperature of 80-120 DEG C; (2) filtering leach liquor and solids, and washing more than three times by using diluted hydrochloric acid; (3) adding a reducing agent to a solution till the electromotive force of the solution is about 770mV, so that all Fe<3+> in the solution is reduced to Fe<2+>, and meanwhile, intrinsic Fe<2+> in the solution generates ferric oxide; (4) adding ferrous chloride, carrying out induction fractal crystallization at the temperature of 80-120 DEG C, filtering to obtain aluminum chloride hexahydrate crystals with relatively good crystalline form, or recrystallizing the obtained crystals, then washing by using a high-concentration aluminium chloride solution, and drying to obtain an aluminum chloride hexahydrate product; (5) adding water, cooling and crystallizing so as to respectively remove calcium, magnesium, potassium, sodium and the like in the solution, and separating out ferrous chloride tetrahydrate (FeC12.4H2O); and (6) carrying out a hydrothermal reaction for 4-12 hours at the temperature of 120-200 DEG C by using obtained the ferrous chloride tetrahydrate, and reacting so as to generate ferric oxide and an HCI solution. The method is easy to operate, pollution-free to environments and in line with the requirements of green chemical industries on clean production.

Description

technical field [0001] The invention relates to the utilization of fly ash resources, in particular to a method for preparing aluminum chloride hexahydrate by inducing crystallization of ferrous chloride using fly ash as a raw material. Background technique [0002] Fly ash is one of the industrial wastes with a large amount of discharge in my country. At this stage, the annual discharge of slag in my country is nearly 50 million tons. As of 2012, the total amount of its emissions has reached nearly 500 million tons, which has caused tremendous pressure on my country's national economic construction and ecological environment. However, fly ash contains a large amount of Al that can be utilized 2 o 3 (~40%wt) and SiO 2 resources, so it has great application prospects. [0003] The methods of extracting aluminum from fly ash at home and abroad can be divided into alkaline method and acid method. Alkali method has a very mature industrial application for processing high-gr...

Claims

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Application Information

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IPC IPC(8): C01F7/56
Inventor 李志宝高文成
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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