Method for combined treatment on chlorinated waste molten salts and Cl-containing waste water

A combined treatment and molten salt technology, applied in chemical instruments and methods, alkali metal chlorides, water/sewage treatment, etc., can solve the problems of waste molten salt and Cl--containing wastewater polluting the environment, and achieve the effect of saving industrial water.

Inactive Publication Date: 2014-04-30
重庆环投生态环境监测网络与工程治理有限公司
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  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a method for joint treatment of chlorination waste molten salt and Cl-containing waste water, to solve the problem of environmental pollution caused by waste molten salt and Cl-containing waste water in the preparation of TiCl by molten salt chlorination

Method used

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  • Method for combined treatment on chlorinated waste molten salts and Cl-containing waste water
  • Method for combined treatment on chlorinated waste molten salts and Cl-containing waste water
  • Method for combined treatment on chlorinated waste molten salts and Cl-containing waste water

Examples

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example 1

[0026] Example 1: Such as the process flow of waste molten salt treatment figure 1 As shown, the waste molten salt is directly cooled to room temperature after being discharged from the furnace, and then the oxide layer at the bottom of the waste molten salt is separated to obtain oxides and some chlorides. The main component of the oxides is Al 2 o 3 , SiO 2 , Fe 2 o 3 、TiO 2 , CaO, MgO, accounting for 13.0-15.0% of the total weight of the molten salt, and the oxide layer contains 10.3% chloride. After separation, the waste molten salt is crushed separately. Add water to the oxide layer to make a saturated solution of chloride, and separate the solid phase and the saturated solution of chloride 1 after filtration.

[0027] Add 45.0-70.0% of the chloride mass to the additional waste molten salt with a concentration of 10,000ppm Cl - The waste water forms a chloride supersaturated solution with a temperature of 80-100°C. After filtration, coke, NaCl solid and hot chlo...

example 2

[0028] Example 2: Such as the process flow of waste molten salt treatment figure 2 As shown, its technology is basically the same as Example 1, the difference is: after the saturated solution 1 of chloride is mixed with hot chloride saturated solution 2, milk of lime is added first, and then Ca in the solution is added. 2+ Equivalent Na 2 CO 3 , after cooling and filtering, the solid phase, NaCl and KCl aqueous solutions were separated. Add an appropriate amount of precipitated NaCl to the aqueous solution of NaCl and KCl to make an aqueous solution with a NaCl content of 10.0-12.0%, and prepare a NaOH solution with a purity of 10.0-12.0% after electrolysis.

example 3

[0029] Example 3: Such as the process flow of processing waste molten salt image 3 Shown, its technique is basically the same as example 1, and the difference is: add milk of lime and Na after mixing saturated solution 1 of chloride and hot chloride saturated solution 2 2 CO 3 , after filtration, the solid phase, aqueous NaCl and KCl were separated. Add appropriate amount of NaCl to the aqueous solution of NaCl and KCl to prepare a saturated solution of NaCl, then add NH4 HCO 3 (or NH 3 , CO 2 and H 2 O), that is, the following reaction occurs:

[0030] NaCl (saturated) + NH 4 HCO 3 = NaHCO 3 +NH 4 Cl (fertilizer)

[0031] 2NaHCO 3 = Na 2 CO 3 +CO 2 +H 2 o

[0032] Preparation of Na 2 CO 3 +K 2 CO 3 Soda ash with a purity >95.6% can be added to the chloride solution treated with milk of lime for recycling.

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Abstract

The invention relates to a method for combined treatment on chlorinated waste molten salts and Cl-containing waste water. The method comprises the following steps that waste molten salts taken out of a furnace and cooled form three layers; each one of the three layers is subjected to separation and crushing and then is added with Cl-containing waste water; oxides, coke, a part of NaCl and a chloride aqueous solution are separated out; the chloride aqueous solution is added with lime milk and Na2CO3; precipitates are separated out and an aqueous solution rich in NaCl and KCl is obtained; and the aqueous solution rich in NaCl and KCl is subjected to comprehensive treatment. Waste heat released by molten salt cooling can be used for heating Cl-containing waste water. The method provided by the invention can solve the persistent problem that the fused salt electrolysis process for preparation of TiCl4 produces waste molten salts and Cl-containing waste water polluting the environment, and can realize recovery of raw materials of coke, NaCl and CaCO3 micro powder, treatment on a large amount of industrial waste water, saving of a large amount of industrial water, utilization of waste heat of waste molten salts, and recycle of waste molten salts and Cl-containing waste water.

Description

technical field [0001] The invention relates to a method for treating waste molten salt and Cl-containing wastewater, in particular to a method for jointly treating chlorination waste molten salt and Cl-containing wastewater. Background technique [0002] Preparation of TiCl by Molten Salt Chlorination 4 The biggest advantage is that it can adapt to a wide range of raw materials, and is suitable for processing high-calcium-magnesium-titanium slag and TiO 2 Low-grade titanium slag, excellent product quality, the produced TiCl 4 It accounts for about 40% of the world's titanium industry consumption. After the vanadium-titanium ore in the Panzhihua-Xichang area of ​​my country is treated, the content of calcium and magnesium in the obtained titanium-containing materials is relatively high (MgO+CaO≧5-9%), which is suitable for the production of TiCl by molten salt chlorination 4 . However, during the production of sponge titanium and titanium dioxide, a large amount of molte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/04C02F1/58
CPCY02P20/129
Inventor 曹大力张帆
Owner 重庆环投生态环境监测网络与工程治理有限公司
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