Treatment method of ferrous waste hydrochloric acid

A treatment method, waste hydrochloric acid technology, applied in separation methods, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of high equipment requirements, consumption, high temperature, etc., and achieve low operation requirements and low energy consumption , the effect of simple operation

Active Publication Date: 2015-08-12
BERIS ENG & RES CORP
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  • Claims
  • Application Information

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Problems solved by technology

However, the above method requires high equipment, and evaporation and thermal decomposition consume a lar

Method used

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  • Treatment method of ferrous waste hydrochloric acid
  • Treatment method of ferrous waste hydrochloric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0071] First, the source of the iron-containing waste hydrochloric acid treated in this embodiment will be described.

[0072] A steel mill with an annual output of 1.7 million tons of carbon steel sheets, the main process facilities include pickling and continuous rolling unit, coiling unit, bell annealing furnace, skin pass unit, recoiling unit, continuous hot-dip galvanizing unit, packaging unit and its supporting equipment Public and auxiliary facilities. The production process uses 200g / L (5.5mol / L) hydrochloric acid to pickle the carbon steel sheet to remove the surface scale. The iron content (calculated as metallic iron) after pickling is about 120g / L (2.14mol Fe / L) , where Fe 3+ with Fe 2+ The ratio is 1:1, and the excess acidity is 0.15mol / L. The amount of waste hydrochloric acid produced in the production process is about 11m 3 / h, the temperature of waste hydrochloric acid is about 80°C.

[0073] Secondly, the following is the treatment process of iron-contain...

Embodiment 2

[0087] First, the source of the iron-containing waste hydrochloric acid treated in this embodiment will be described.

[0088] A 6 million tons plate production line, the pickling process produces 228,000 cubic meters of pickling solution per year. Based on an annual production day of 300 days, the daily processing is 760 cubic meters, and the processing is 31.7 cubic meters per hour. The concentration of pickling solution is 6.5mol / L, the concentration of metallic iron is 126.77g / L, Fe 3+ with Fe 2+ The ratio is 9:1, the excess H + The concentration is 0.15mol / L, and 228,000 cubic meters of pickling solution contains 28,900 tons of metallic iron.

[0089] Secondly, the following is the treatment process of iron-containing waste hydrochloric acid.

[0090] Use 1000 cubic meters of glass fiber reinforced plastic reaction tank as the tempering pool, and each glass fiber reinforced plastic reaction tank is equipped with a hydrogen discharge port and a liquid circulation pump....

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Abstract

The invention provides a treatment method of ferrous waste hydrochloric acid. The method comprises the following steps: (1) enabling the ferrous waste hydrochloric acid to react with plenty of scrap iron until complete solute in the solution is ferrite ferrous chloride; (2) concentrating and crystallizing the ferrous chloride solution obtained from the step (1) through a multi-stage vacuum distillation device and a single-stage vacuum distillation device, so as to obtain a ferrous chloride crystal; (3) calcining the ferrous chloride crystal obtained from the step (2) through a rotary kiln, decomposing to obtain hydrogen chloride gas, water vapor and a ferric oxide solid, collecting the ferric oxide solid to obtain a ferric oxide product, and exhausting mixed gas containing the hydrogen chloride gas, the water vapor, a little of ferric oxide dust and combustion tail gas; and (4) cooling the mixed gas obtained from the step (3) through a heat exchanger to form hydrochloric acid droplets.

Description

technical field [0001] The invention relates to a treatment method for iron-containing waste hydrochloric acid, in particular to a treatment method for iron-containing waste hydrochloric acid in iron and steel smelting or processing. Background technique [0002] In the iron and steel metallurgy process, non-ferrous metal smelting process, and steel processing process, a lot of hydrochloric acid-containing wastewater will be produced, such as the pickling waste liquid in the steel rolling process and steel processing, and the iron-containing waste hydrochloric acid produced in the acid leaching process of non-ferrous metal smelting. This type of iron-containing waste hydrochloric acid has the following characteristics: high iron concentration and certain excess acidity. At present, the recycling of this kind of waste acid usually adopts the method of spraying the waste iron-containing hydrochloric acid into the hot air flow generated by the high-temperature flame, spraying t...

Claims

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Application Information

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IPC IPC(8): C02F9/02C01B7/01C23G1/36B01D50/00
Inventor 赵铭于学锋王振平刘欢
Owner BERIS ENG & RES CORP
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