Method for preparing liquid ferrous chloride for water treatment by taking waste hydrochloric acid as raw material

A technology of ferrous chloride and waste hydrochloric acid, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Simple to use effects

Active Publication Date: 2014-12-24
杭州富阳立利冷轧有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this process is a process that consumes a lot of energy

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  • Method for preparing liquid ferrous chloride for water treatment by taking waste hydrochloric acid as raw material

Examples

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Effect test

Embodiment 1

[0035] A method for preparing liquid ferrous chloride for water treatment as raw material with waste hydrochloric acid, comprising the steps of:

[0036] (1) Choose to meet the national standard of GB320-2006 industrial synthetic hydrochloric acid, and at the same time meet the arsenic content ≤0.0005wt%, lead content ≤0.004 wt%, mercury content ≤0.00002 wt%, cadmium content ≤0.0005 wt%, chromium content ≤0.01 wt% %, zinc content ≤ 0.015 wt % standard hydrochloric acid (you can buy hydrochloric acid that meets the above standards from the market) as hydrochloric acid for strip pickling. In the pickling line of the workshop, in order to better handle waste hydrochloric acid, restrictions are imposed on the discharge of waste hydrochloric acid from pickling. The oily wastewater generated during maintenance, the strip washing wastewater, and the liquid waste generated in other links are not allowed to enter the waste hydrochloric acid storage tank.

[0037] (2) Detect the concentr...

Embodiment 2

[0043] A method for preparing liquid ferrous chloride for water treatment as raw material with waste hydrochloric acid, comprising the steps of:

[0044] (1) Choose to meet the national standard of GB320-2006 industrial synthetic hydrochloric acid, and at the same time meet the arsenic content ≤0.0005wt%, lead content ≤0.004 wt%, mercury content ≤0.00002 wt%, cadmium content ≤0.0005 wt%, chromium content ≤0.01 wt% %, zinc content ≤ 0.015 wt % standard hydrochloric acid (you can buy hydrochloric acid that meets the above standards from the market) as hydrochloric acid for strip pickling. In the pickling line of the workshop, in order to better handle waste hydrochloric acid, restrictions are imposed on the discharge of waste hydrochloric acid from pickling. The oily wastewater generated during maintenance, the strip washing wastewater, and the liquid waste generated in other links are not allowed to enter the waste hydrochloric acid storage tank.

[0045] (2) Detect the concen...

Embodiment 3

[0051] A method for preparing liquid ferrous chloride for water treatment as raw material with waste hydrochloric acid, comprising the steps of:

[0052] (1) Choose to meet the national standard of GB320-2006 industrial synthetic hydrochloric acid, and at the same time meet the arsenic content ≤0.0005wt%, lead content ≤0.004 wt%, mercury content ≤0.00002 wt%, cadmium content ≤0.0005 wt%, chromium content ≤0.01 wt% %, zinc content ≤ 0.015 wt % standard hydrochloric acid (you can buy hydrochloric acid that meets the above standards from the market) as hydrochloric acid for strip pickling. In the pickling line of the workshop, in order to better handle waste hydrochloric acid, restrictions are imposed on the discharge of waste hydrochloric acid from pickling. The oily wastewater generated during maintenance, the strip washing wastewater, and the liquid waste generated in other links are not allowed to enter the waste hydrochloric acid storage tank.

[0053] (2) Detect the concen...

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Abstract

The invention discloses a method of preparing liquid ferrous chloride for water treatment by taking waste hydrochloric acid as a raw material. The method comprises the following steps: firstly, controlling content of ferrous chloride to be not lower than 20wt% in the waste hydrochloric acid and controlling the content of free aid to be not greater than 5wt%; secondly, exhausting the waste hydrochloric acid into an acid storage tank, standing and precipitating for 24-48 hours; extracting the waste hydrochloric acid at the upper layer of the acid storage tank again and conveying the extracted waste hydrochloric acid to a filter tank to filter; and finally, detecting content of acid non-soluble substances in filtered waste hydrochloric acid, and collecting the obtained waste hydrochloric acid, namely qualified liquid ferrous chloride product for water treatment when the content of the acid non-soluble substances in the waste hydrochloric acid is not greater than 0.5wt%. The method is low in energy consumption for treating the waste hydrochloric acid, low in cost, high in efficiency, convenient to operate, good in applicability, capable of utilizing products produced by waste hydrochloric acid treatment secondarily and high in economic value.

Description

technical field [0001] The invention relates to a treatment method for waste hydrochloric acid, in particular to a method for preparing liquid ferrous chloride for water treatment by using waste hydrochloric acid as a raw material. Background technique [0002] In the strip pickling process, industrial hydrochloric acid with a mass fraction greater than or equal to 31% is used to prepare pickling solutions of different concentrations to chemically react with the surface of the steel strip to achieve the purpose of rust removal and decontamination. The pickling process produces a large amount of spent acid. Generally, one ton of steel strip consumes 15-18kg of hydrochloric acid and produces 20-30kg of waste hydrochloric acid. When the strip is pickled, when the concentration of hydrochloric acid is lower than 3% or the concentration of ferrous chloride is higher than 20%, it will be discharged as waste acid, and the waste hydrochloric acid will be stored in the waste acid st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10C02F1/00
Inventor 潘仁华
Owner 杭州富阳立利冷轧有限公司
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