Method for preparing Friedel's salt from titanium extraction slag and the Friedel's salt

A technology of titanium slag and filter residue, which is applied in the field of Friedel salt, can solve problems such as hidden dangers of environmental pollution in the surrounding area, and achieve the effects of alleviating economic pressure and environmental protection pressure, reducing pollution, and improving economic effects

Active Publication Date: 2021-11-26
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0002] When high-temperature carbonization-low-temperature selective chlorination process is used to extract titanium from high-titanium blast furnace slag, due to the low-temperature chlorination link in the process, a large amount of chlorine-containing titanium extraction tailings (that is, titanium extraction slag) will be produced. Titanium slag has a certain chemical reactivity, but due to the high content of water-soluble chloride, the mass percentage of chlorine is usually between 2 and 7%, so it cannot be directly used in cement and concrete admixtures like ordinary blast furnace slag. Based on stockpiling, while occupying a large amount of land resources, it also has potential pollution hazards to the surrounding environment, causing huge economic, environmental and social pressure on enterprises

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  • Method for preparing Friedel's salt from titanium extraction slag and the Friedel's salt
  • Method for preparing Friedel's salt from titanium extraction slag and the Friedel's salt

Examples

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Effect test

example 1

[0044] In this example, the method of extracting titanium slag to prepare Friedel's salt includes:

[0045] Step S1: Take 2 t of titanium extraction slag, wash, soak and filter repeatedly until the soluble chloride ions in the filter residue are completely dissolved, and then filter to obtain the first filter residue and the first filtrate. The chlorine content in the first filter residue is 0.3‰. After drying with the waste heat generated during low-temperature chlorination of high-titanium slag, it can be directly used in cement or cement concrete admixture, and the liquid can be sold as a product.

[0046] Step S2, using the heat during low-temperature chlorination to evaporate and concentrate the first filtrate to reduce the volume of the solution. After evaporation, the concentration of calcium chloride in the filtrate is at least CaCl 2 35% of the concentration of the saturated solution, at this time the result is the first filtrate concentrate.

[0047] Step S3, measur...

example 2

[0052] In this example, the method of extracting titanium slag to prepare Friedel's salt includes:

[0053] Step S1: Take 5 t of the original titanium slag, wash, immerse in water and filter repeatedly until the soluble chloride ions in the filter residue are completely dissolved, and then filter to obtain the first filter residue and the first filtrate. At this time, the chlorine content in the first filter residue is 0.4‰, and it can be directly used in cement or cement concrete admixture, or sold as a product after being dried with waste heat generated during low-temperature chlorination of high-titanium slag.

[0054] Step S2, using the heat during low-temperature chlorination to evaporate and concentrate the first filtrate to reduce the volume of the solution. After evaporation, the concentration of calcium chloride in the filtrate is at least CaCl 2 20% of the concentration of the saturated solution, at this time the result is the first filtrate concentrate.

[0055] St...

example 3

[0060] In this example, the method for preparing Friedel's salt from titanium slag includes:

[0061] Step S1, taking 1 ton of the original titanium slag, washing, immersing and filtering repeatedly until the soluble chloride ions in the filter residue are completely dissolved. Filtration to obtain the first filter residue and the first filtrate.

[0062] The chlorine content in the first filter residue is 0.2‰. After drying with the waste heat generated during low-temperature chlorination of high-titanium residue, it can be directly used in cement or cement concrete admixture, and the liquid can be sold as a product.

[0063] Step S2, using the heat during low-temperature chlorination to evaporate and concentrate the first filtrate to reduce the volume of the solution. After evaporation, the concentration of calcium chloride in the filtrate is at least CaCl 2 25% of the concentration of the saturated solution, at this time the result is the first filtrate concentrate.

[00...

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Abstract

The invention provides a method for preparing Friedel's salt from titanium extraction slag and the Friedel's salt. The method comprises the following steps: washing and soaking the titanium extraction slag with water till soluble chloride ions in the titanium extraction slag are dissolved out, and filtering to obtain first filter residues and a first filtrate which mainly comprises calcium chloride and magnesium chloride; evaporating and concentrating the first filtrate to obtain a first filtrate concentrated solution; adding calcium oxide or calcium hydroxide into the first filtrate concentrated solution, completely precipitating magnesium ions to generate magnesium hydroxide, completely precipitating aluminum ions to generate aluminum hydroxide, and filtering to obtain second filter residues and a second filtrate; and adding a chloride ion curing agent into the second filtrate to convert chloride ions in the filtrate into Friedel salt, and filtering to obtain third filter residues and a third filtrate. The Friedel's salt is prepared by using the titanium extraction slag as a raw material and using the method. The method provided by the invention can realize recycling of titanium extraction slag resources.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a method for preparing Friedel's salt by extracting titanium slag and the Friedel's salt prepared by the method. Background technique [0002] When high-temperature carbonization-low-temperature selective chlorination process is used to extract titanium from high-titanium blast furnace slag, due to the low-temperature chlorination link in the process, a large amount of chlorine-containing titanium extraction tailings (that is, titanium extraction slag) will be produced. Titanium slag has a certain chemical reactivity, but due to the high content of water-soluble chloride, the mass percentage of chlorine is usually between 2 and 7%, so it cannot be directly used in cement and concrete admixtures like ordinary blast furnace slag. Mainly stockpiled, while occupying a large amount of land resources, it also has potential pollution hazards to the surroundin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00
CPCC01P2006/80C01P2002/72C01P2004/03
Inventor 唐颂彭同江孙红娟
Owner SOUTHWEAT UNIV OF SCI & TECH
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