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Resourceful treatment apparatus and method for waste liquid of chlorohydric acid pickling of steel

A technology of pickling waste liquid and recycling, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, separation methods, etc., can solve the problem that the residual iron content of the effluent cannot reach the standard, the hydrochloric acid-water azeotrope obstacle, and the concentration of recovered hydrochloric acid. It can improve the coagulation effect, improve the distillation effect, and have both environmental value and economic value.

Active Publication Date: 2013-09-11
浙江天川环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Evaporation crystallization method has low treatment cost, but the residual iron content of the effluent after crystallization treatment cannot meet the standard
The application of ion exchange method and membrane treatment method is also limited by the high concentration of iron content, which is easy to cause resin and membrane fouling
The evaporative distillation method has the advantages of simple equipment and low processing cost, and is favored by small iron and steel enterprises. However, when evaporative distillation of hydrochloric acid waste liquid, it will encounter the obstacle of hydrochloric acid-water azeotrope, resulting in low concentration of recovered hydrochloric acid and incomplete recovery. and other shortcomings

Method used

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  • Resourceful treatment apparatus and method for waste liquid of chlorohydric acid pickling of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1. Add solid calcium chloride to the waste hydrochloric acid pickling liquid, and carry out intermittent distillation operation to the waste hydrochloric acid pickling liquid under normal pressure;

[0022] Take the hydrochloric acid pickling waste liquid and place it in the distillation still, add solid calcium chloride, the addition of solid is 1mol / L. Heating and distilling, stop the distillation when the volume ratio of the collected distilled condensate to the addition of hydrochloric acid waste liquid is 3:10;

[0023] Step 2. Add oxidant sodium chlorate and stabilizer sodium phosphate to the distillation mother liquor under stirring conditions, and carry out oxidation and polymerization under normal temperature and pressure;

[0024] In the hydrochloric acid pickling waste distillation mother liquor processed in step one, add water to dilute to prevent crystallization from separating out, add stabilizer sodium phosphate to the hydrochloric acid pickling wast...

Embodiment 2

[0029] Step 1. Add solid calcium chloride to the waste hydrochloric acid pickling liquid, and carry out intermittent distillation operation to the waste hydrochloric acid pickling liquid under normal pressure;

[0030] Take the hydrochloric acid pickling waste liquid and place it in the distillation still, add solid calcium chloride, the addition of solid is 0.75mol / L. Heating and distilling, stop the distillation when the volume ratio of the collected distillate condensate to the addition of hydrochloric acid waste liquid is 3.5:10;

[0031] Step 2. Add oxidant sodium chlorate and stabilizer sodium phosphate to the distillation mother liquor under stirring conditions, and carry out oxidation and polymerization under normal temperature and pressure;

[0032] In the hydrochloric acid pickling waste distillation mother liquor processed in step one, add water to dilute to prevent crystallization from separating out, add stabilizer sodium phosphate to the hydrochloric acid picklin...

Embodiment 3

[0037] Step 1. Add solid calcium chloride to the waste hydrochloric acid pickling liquid, and carry out intermittent distillation operation to the waste hydrochloric acid pickling liquid under normal pressure;

[0038] Take the hydrochloric acid pickling waste liquid and place it in the distillation still, add solid calcium chloride, the addition of solid is 1.25mol / L. Heating and distilling, stop the distillation when the volume ratio of the collected distilled condensate to the addition of hydrochloric acid waste liquid is 4:10;

[0039] Step 2. Add oxidant sodium chlorate and stabilizer sodium phosphate to the distillation mother liquor under stirring conditions, and carry out oxidation and polymerization under normal temperature and pressure;

[0040] In the hydrochloric acid pickling waste distillation mother liquor processed in step one, add water to dilute to prevent crystallization from separating out, add stabilizer sodium phosphate to the hydrochloric acid pickling w...

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Abstract

The invention discloses a resourceful treatment apparatus and method for waste liquid of chlorohydric acid pickling of steel. At present, a conventional pickling waste liquid treatment method has the disadvantages of high requirements of treatment equipment, high treatment cost, inadequate recovery and the like. According to the invention, salt-added distillation technology is employed for recovery of high-concentration hydrochloric acid, and distillation mother liquor is used to prepare a liquid polyferric sulfate coagulant. The method comprises the following steps: adding a calcium chloride or magnesium chloride solid into the waste liquid of chlorohydric acid pickling, carrying out atmospheric distillation, removing excess acidity and recovering high-concentration hydrochloric acid; and then adding an oxidizing agent and a stabilizing agent into the distillation mother liquor with stirring, carrying out a reaction at normal temperature and normal pressure for 1 h and carrying out standing for curing for 24 h so as to obtain a liquid calcium-iron or magnesium-iron composite coagulant product. The invention has the following advantages: production process is simple, investment is little, recovery of hydrochloric acid and preparation of the polyferric sulfate coagulant can be synchronously carried out, zero discharge of waste liquid of pickling of steel is realized, the purposes of reuse of resources and treatment of waste with waste are achieved, and both an environmental value and an economic value are obtained.

Description

technical field [0001] The invention belongs to the field of resource utilization of pickling waste liquid, and in particular relates to a device and method for recycling steel hydrochloric acid pickling waste liquid. Background technique [0002] In the next few years, my country's per capita steel consumption will continue to rise, construction machinery and other downstream industries will maintain growth, and the steel processing industry will further develop. The pickling process is an important link in the steel processing process, and the discharge of metal pickling waste liquid will also increase. Hydrochloric acid and sulfuric acid are the most important cleaning agents in the pickling process. Hydrochloric acid pickling is widely used because the loss of base iron is less than that of sulfuric acid due to the stripping effect. Therefore, the current steel pickling is basically based on the hydrochloric acid pickling process. Steel hydrochloric acid pickling waste ...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01D21/01C01B7/01C02F103/16
Inventor 胡勤海张荣臻刘苗裴毓雯宋雪斐张顾民
Owner 浙江天川环保科技有限公司
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