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Method for producing impurity-bearing liquid calcium chloride by utilization of converter dedusting wastewater

A converter dedusting wastewater and calcium chloride technology, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problems of long process flow, improve the ecological environment, avoid environmental pollution, reduce The effect of production costs

Active Publication Date: 2012-12-19
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no mention of using pickling waste to prepare calcium chloride, and the process is long and requires additional control of the reaction temperature

Method used

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  • Method for producing impurity-bearing liquid calcium chloride by utilization of converter dedusting wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Check that the molar concentration of HCl in the pickling waste liquid is 2.53mol / L, and the mass fraction of CaO in the dust removal dust of the LF furnace is 50.20%; 2 The molar concentration of the wastewater solution is 0.18mol / L. The specific process is as follows: 972.69kg and 10m 3 The cold-rolled acid-containing waste water was added to the milk mixing tank, and after stirring for 1 hour, lime milk was made; then the lime milk and 9.96m 3 The pickling waste liquid is added to the neutralization tank and injected into the 50.04m 3 Converter dedusting wastewater, the neutralized solution flows into the sedimentation tank for static precipitation, and the upper layer is clear as CaCl 2 The impurity-containing liquid calcium chloride solution with a molar concentration of 0.18mol / L.

Embodiment 2

[0022] Check that the molar concentration of HCl in the pickling waste liquid is 2.53mol / L, and the mass fraction of CaO in the carbide slag is 63.00%; determine the required preparation of impurity-containing CaCl 2 The molar concentration of the solution is 0.10mol / L. The specific process is as follows: 417.65kg of calcium carbide dry slag and 5.20m 3 The converter dedusting waste water was added to the milk mixing tank, and after stirring for 1 hour, lime milk was made; then the lime milk and 5.53m 3 The pickling waste liquid is added to the neutralization tank and injected into the 59.27m 3 The converter dedusting wastewater, the neutralized solution flows into the sedimentation tank for static precipitation, and the upper layer is clear as CaCl 2 A liquid calcium chloride solution containing impurities with a molar concentration of 0.10 mol / L.

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Abstract

The invention discloses a method for impurity-bearing liquid calcium chloride by the utilization of converter dedusting wastewater. Materials for the production of the impurity-bearing liquid calcium chloride comprise the converter dedusting wastewater, a pickling waste liquid and dust or carbide slag. The method comprises the following steps of: a, examining mole concentration of HCl in the pickling waste liquid and mass percentage of CaO in the dust or carbide slag; calculating mole number of the added converter dedusting wastewater, dust or carbide slag and pickling waste liquid required by each unit volume of an impurity-bearing CaCl2 solution according to the mole concentration of the impurity-bearing CaCl2 solution which is expected to be prepared and according to the formula of CaO+2HCl=CaCl2+H2O, and calculating the volume of the added converter dedusting wastewater and the pickling waste liquid and the weight of dust or carbide slag which are required by each unit volume of the impurity-bearing CaCl2 solution according to the mole concentration of HCl in the pickling waste liquid and mass percentage of CaO in dust or carbide slag; b, preparing an emulsion by the use of the dust or carbide slag and the converter dedusting wastewater in an emulsion preparation pot; c, respectively adding the emulsion prepared from the step b, the pickling waste liquid and the converter dedusting wastewater into a neutralization pond; and d, allowing the solution obtained from the step c to flow into a settler for static settlement. The clear upper layer is the impurity-bearing liquid calcium chloride solution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource utilization, and in particular relates to a method for producing impurity-containing liquid calcium chloride by utilizing converter dedusting wastewater in iron and steel metallurgy. Background technique [0002] A large amount of high-temperature flue gas is produced in the process of converter steelmaking. The flue gas is cooled to 800°C to 1000°C through the movable hood, the upper fixed hood and the vaporization cooling flue, and then passes through the first-stage water overflow fixed Venturi tube ( Commonly known as one article) and two-stage adjustable venturi tube (commonly known as two articles) washing, and then through the gravity dehydrator and 90 ° elbow, the dust in the flue gas is removed, and the temperature of the flue gas is reduced at the same time. The water used for dust removal and cooling by the two-stage venturi tube is discharged through the d...

Claims

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Application Information

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IPC IPC(8): C01F11/28
Inventor 杨大正杨大立于淑娟任伟李金莲徐鹏飞王永徐伟
Owner ANGANG STEEL CO LTD
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