Comprehensive treatment method for chlorine-containing solid waste

A comprehensive treatment and sodium chloride technology, which is applied in the direction of alkali metal chloride, magnesium hydroxide, calcium/strontium/barium sulfate, etc., can solve the problems of low operating efficiency, cumbersome operation, and low effective utilization rate of calcium chloride solution, etc. problems, to achieve the effect of high operating efficiency and convenient operation

Active Publication Date: 2019-04-30
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) The mixing volume ratio of the liquid after transformation and the high-concentration calcium chloride solution is 1:1~5, the mixing volume ratio is 1:1, the crystallization of sodium chloride is less than 50%, the mixing volume ratio is 1:5, the chlorine The crystallization of sodium chloride can be increased to about 75%, but the effective uti...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] AlCl 3 37.5%, FeCl 3 100kg of dust-collecting slag from flue gas of 10.8% fluidized chlorination furnace, add 410g / L MgCl at a solid / liquid ratio of 1:10g / mL 2 , 65g / L MgSO 4 Wash with aqueous solution, stir at 45°C for 0.5h, filter to obtain filtrate and washing residue, and return the washing residue to be used as chlorination charge, stir the obtained filtrate and add calcium hydroxide to adjust pH to 8.2, filter to obtain aluminum hydroxide, iron hydroxide and gypsum The filter cake of the mixture and the filtrate for removing aluminum and iron, the gypsum containing aluminum and iron are washed and used as cement additives, and the obtained filtrate is added with sodium sulfate to transform into crystalline sodium chloride. The amount of sodium sulfate added is to supplement the sulfate radicals consumed by the formation of gypsum Required amount, stirred at 55°C for 1h, filtered to obtain sodium chloride crystals with a purity of 99.31% and a mixed solution of m...

Embodiment 2

[0029] AlCl 3 34.8%, FeCl 3 13.2% fluidized chlorination furnace flue gas dust collection slag 500kg, add 420g / L MgCl according to solid / liquid ratio 1:12g / mL 2 , 20g / L MgSO 4 Wash with aqueous solution, stir at 55°C for 1 hour, filter to obtain filtrate and washing residue, return the washing residue to be used as chlorination charge, and then add sodium sulfate according to the theoretical amount of aluminum chloride and ferric chloride in the resulting filtrate converted to sulfate , stirred at 80°C for 1.5h, using Cl in the solution - The same ion effect produced by the ions promotes the addition of sodium to precipitate in the form of sodium chloride solid, filter to obtain sodium chloride crystals and its crystallized liquid, and finally stir and add calcium hydroxide to the obtained crystallized liquid to adjust the pH to 8.2, filter The aluminum-iron-containing gypsum and neutralized liquid are obtained, the aluminum-iron-containing gypsum is washed and used as ceme...

Embodiment 3

[0031] AlCl 3 2.45%, NaCl 32.1%, CaCl 2 7.31%, MgCl 217.12%, FeCl 3 2.84%, MnCl 2 1.24% molten salt chlorination waste salt slag 0.5t, add 305g / L MgCl at a solid / liquid ratio of 1:18g / mL 2 The aqueous solution washing, 35 ℃ of stirring 1h, filter to obtain the mixture filter residue containing titanium-rich material and sodium chloride crystal and NaCl concentration is the liquid after washing of 1.8g / L, and the crystallization rate of sodium chloride reaches 98.90% (sodium chloride's The dissolution rate is 1.01%), and the obtained filter residue is returned to prepare molten salt chlorination furnace charge. After washing, the liquid is stirred and added with calcium oxide to adjust the pH to 8.8, and an appropriate amount of hydrogen peroxide is added, stirred at 85°C for 1.5h, and the precipitated iron and aluminum are removed by filtration , manganese and other impurities, continue to add calcium oxide to adjust the pH to 9.2, stir at 105 ° C for 2.5 hours, filter...

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Abstract

A comprehensive treatment method for chlorine-containing solid waste is characterized by comprising the steps: taking a solution containing magnesium chloride or/and magnesium sulfate as a washing liquid for the chlorine-containing solid waste, allowing obtained washed slag to return to be used as chlorination furnace charge, adding lime into the washing liquid, neutralizing to make impurities such as aluminum and iron precipitated and separated out, and filtering to obtain an impurity-removed post-liquid; and then adding sodium sulfate into the impurity-removed post-liquid, using a common ioneffect produced by chloridions, promoting chlorine to be precipitated and separated out in a form of sodium chloride solid, filtering to obtain sodium chloride crystals and a crystallization post-liquid, and allowing crystallized mother liquor to return to a washing process of the chlorine-containing solid waste for recycling, so as to realize the craft process of comprehensive utilization of thechlorine-containing solid waste. The method has the advantages of convenient operation, high operation efficiency, cleanliness and environmental protection, and is suitable for industrial applicationof treatment of the chlorine-containing solid waste.

Description

technical field [0001] The invention belongs to the fields of metallurgy and chemical industry, and in particular relates to a comprehensive treatment method for chlorine-containing solid waste. Background technique [0002] The chlorination metallurgical process produces a large amount of solid waste containing chloride, such as chlorination furnace gas dust slag, chlorination furnace bottom slag, chlorination waste salt slag, titanium tetrachloride precipitation mud, etc. Chlorides, especially metal chlorides, have relatively high solubility, such as aluminum chloride, ferric chloride, and calcium chloride, which all exceed 500g / L at room temperature. Most metal chlorides are deliquescent, so chlorine-containing solid waste is difficult to keep. Arbitrary stockpiling of chlorine-containing solid waste is likely to cause environmental pollution, so solid waste containing chloride is generally washed with water first, and then neutralized with sodium hydroxide for filtratio...

Claims

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Application Information

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IPC IPC(8): C01D3/04C01F5/22C01F11/46C04B22/14C04B103/22
CPCC01D3/04C01F5/22C01F11/46C01P2006/80C04B22/143C04B2103/22
Inventor 王学文孟钰麒王懿葛奇王明玉
Owner CENT SOUTH UNIV
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