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Method for treating chromium-containing alkali solution

An alkaline aqueous solution and solution technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of unrecoverable alkali and high acid consumption, and achieve low production cost, Good economic benefit and avoid secondary pollution

Active Publication Date: 2014-06-25
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above three methods for treating chromium-containing wastewater are all under acidic conditions, but it is obviously inappropriate to use this method for alkaline chromium-containing aqueous solution, and there are problems such as high acid consumption and unrecoverable alkali in the solution.

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  • Method for treating chromium-containing alkali solution

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Experimental program
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Effect test

Embodiment 1

[0020] Example 1: figure 1 Shown, the method for this processing chromium-containing alkaline aqueous solution adopts following processing steps.

[0021] (1) Weigh the solid Ba(OH) according to the molar ratio Cr / Ba=0.8 2 Add 0.4g to 100mL of 1# chromium-containing alkaline aqueous solution (basic chromium-containing solution), which contains chromium 6 + =1g / L, NaOH=100g / L, turn on the stirring, the reaction temperature is 20°C, and the reaction time is 30min.

[0022] (2) At the end of the reaction, suction filtration is performed to obtain barium chromate precipitate and a solution containing sodium hydroxide; the content of liquid phase chromium analyzed by chemistry and instruments is 8 mg / L.

[0023] (3) Barium chromate precipitation Add Pb (NO 3 ) 2 The solution is reacted, and the lead chromate precipitate and the solution containing barium nitrate are obtained through liquid-solid separation;

[0024] (4) Evaporate the solution containing barium nitrate and roa...

Embodiment 2

[0025] Embodiment 2: The method for processing the chromium-containing alkaline aqueous solution adopts the following processing steps.

[0026] (1) Weigh the solid Ba(OH) according to the molar ratio Cr / Ba=1 2 Add 0.6g into 100mL1# chromium-containing alkaline aqueous solution, which contains chromium 6 + =1g / L, NaOH=100g / L, turn on the stirring, the reaction temperature is 50°C, and the reaction time is 30min.

[0027] (2) At the end of the reaction, suction filtration is performed to obtain a barium chromate precipitate and a solution containing sodium hydroxide; the content of liquid phase chromium is 5 mg / L by chemical and instrumental analysis.

[0028] (3) Barium chromate precipitation Add Pb (NO 3 ) 2 The solution is reacted, and the lead chromate precipitate and the solution containing barium nitrate are obtained through liquid-solid separation;

[0029] (4) Barium oxide is obtained by evaporating the solution containing barium nitrate and roasting at 650°C.

Embodiment 3

[0030] Embodiment 3: The method for processing the chromium-containing alkaline aqueous solution adopts the following processing steps.

[0031] (1) Weigh the solid BaCl according to the molar ratio Cr / Ba=1.5 2 Add to 100mL 2# chromium-containing alkaline aqueous solution, which contains chromium 6 + =2g / L, NaOH=200g / L, turn on the stirring, the reaction temperature is 100°C, and the reaction time is 30min.

[0032] (2) reaction end point, suction filtration, obtain barium chromate precipitation and containing sodium hydroxide solution; Adopt the content of chemical and instrument analysis liquid phase chromium to be 8mg / L; Contain sodium hydroxide solution can directly reclaim, directly use in Hydrothermal alkaline hydrometallurgical process or directly used for flue gas desulfurization ingredients.

[0033] (3) Barium chromate precipitation Add Pb (NO 3 ) 2 The solution is reacted, and the lead chromate precipitate and the solution containing barium nitrate are obtained ...

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Abstract

The invention discloses a method for treating a chromium-containing alkali solution. The method comprises the following steps: (1) mixing a chromium-containing alkali solution with a barium precipitant according to a molar ratio Cr / Ba of 0.8:2, reacting, subsequently performing liquid-solid separation to obtain precipitate containing barium chromate and a solution containing sodium hydroxide; (2) adding the precipitate containing barium chromate into a Pb(NO3)2 solution according to a molar ratio Ba / Pb of 1:(1-2), reacting, performing liquid-solid separation to obtain lead chromate precipitate and a solution containing barium nitrate; (3) evaporating and roasting the solution containing barium nitrate at a high temperature to obtain BaO. The method disclosed by the invention is simple to operate, the power of hydrogen of the solution does not need to be adjusted, alkali in an alkali solution can be recycled; the chromium-containing alkali solution, particularly a chromium-containing solution under high alkali condition, can be effectively treated; and the method has the characteristics of low production cost and good economic benefits.

Description

technical field [0001] The invention relates to a processing method for chromium-containing solution, in particular to a method for processing chromium-containing alkaline aqueous solution in chromium salt engineering or chromium chemical industry. Background technique [0002] In the smelting process of vanadium-titanium magnetite, in the process of extracting vanadium and making steel, chromium is oxidized together with vanadium into vanadium slag, and vanadium slag is sodiumized, roasted and water-leached to obtain an aqueous solution containing sodium vanadate and sodium chromate. The ammonium vanadium precipitation process is mainly used to recover vanadium, but this process has the disadvantage that ammonia nitrogen wastewater cannot be treated, which has become a bottleneck in vanadium chemical industry in the field of vanadium titanium magnetite. The calcium vanadium precipitation process is considered a clean production process, and its process is to add Ca(OH) to t...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01D1/32
Inventor 高明磊陈东辉石立新李兰杰周冰晶
Owner HEBEI IRON AND STEEL
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