Comprehensive resourceful treatment device and method for chlorohydric acid pickling waste liquid

A technology of pickling waste liquid and comprehensive resources, applied in metallurgical wastewater treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of high process and equipment requirements, large initial investment, high evaporation temperature, etc., to achieve Taking into account both environmental benefits and economic benefits, reducing environmental pollution hazards, and low investment and disposal costs

Active Publication Date: 2015-09-30
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

The high-temperature roasting method has a high resource recovery rate and the best treatment effect, but at the same time, it has large initial investment, high energy consumption, high process and equipment requirements, which limit its application in small and medium-sized enterprises; ion exchange method and membrane treatment technology can be effective To realize the separation of metal ions and acids, the equipment is simple, but its application is limited by the concentration of metal ions and there is the problem that the resin and membrane components are easily polluted, so it is restricted in practical application; the evaporation crystallization method is simple to operate, and the processing cost is low. However, there are disadvantages such as high evaporation temperature, difficult equipment maintenance, and the residual iron content of the effluent liquid cannot meet the standard.

Method used

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  • Comprehensive resourceful treatment device and method for chlorohydric acid pickling waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Negative pressure evaporation process

[0023] Negative pressure evaporation is carried out on the pickling waste liquid, and the condensed distillate is collected as regenerated hydrochloric acid

[0024] Put 1 ton of hydrochloric acid pickling waste liquid in the evaporator after filtering to remove large particles of impurities, pass in steam, and carry out negative pressure evaporation under the best operating conditions, that is, the vacuum degree is 0.06MPa, the reaction temperature is 88°C, and the waste liquid Evaporation is 50%. The evaporated HCl gas is condensed and recovered by the condensing device to obtain regenerated hydrochloric acid with a mass fraction of about 10%. The tail gas of the condenser is absorbed by circulating tap water spray, and when the concentration of hydrochloric acid in the absorption liquid reaches 5%, it is replaced and recycled as a pickling process Hydrochloric acid diluted with water.

[0025] Step 2: Evaporate the mo...

Embodiment 2

[0032] Step 1: Negative pressure evaporation process

[0033] Negative pressure evaporation is carried out on the pickling waste liquid, and the condensed distillate is collected as regenerated hydrochloric acid

[0034] Put 1 t of hydrochloric acid pickling waste liquid in the evaporator after filtering to remove large particles of impurities, and carry out negative pressure evaporation under the optimal operating conditions described in Example 1 to obtain regenerated hydrochloric acid with a mass fraction of about 10%. The HCl gas that comes out is condensed and recovered by the condensing device, and the tail gas of the condenser is sprayed and absorbed with tap water circulation, and when the concentration of hydrochloric acid in the absorption liquid reaches 5%, it is replaced and recovered as water for diluting hydrochloric acid in the pickling process.

[0035] Step 2: Evaporate the mother liquor and cool and crystallize

[0036] Cool the evaporated distillation mothe...

Embodiment 3

[0042] Step 1: Negative pressure evaporation process

[0043] In the negative pressure evaporation process, the pickling waste liquid is evaporated under negative pressure, and the condensed distillate is collected as regenerated hydrochloric acid

[0044] Put 1 t of hydrochloric acid pickling waste liquid in the evaporator after filtering to remove large particles of impurities, and carry out negative pressure evaporation under the optimal operating conditions described in Example 1 to obtain regenerated hydrochloric acid with a mass fraction of about 10%. The HCl gas that comes out is condensed and recovered by the condensing device, and the tail gas of the condenser is sprayed and absorbed with tap water circulation, and when the concentration of hydrochloric acid in the absorption liquid reaches 5%, it is replaced and recovered as water for diluting hydrochloric acid in the pickling process.

[0045] Step 2: Evaporate the mother liquor and cool and crystallize

[0046] Co...

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Abstract

The invention discloses a comprehensive resourceful treatment device and method for chlorohydric acid pickling waste liquid. The device comprises an evaporator, a separating tank, a crystallizer, a heat exchanger, an absorption tower, a waste acid tank, a reaction kettle, solid-liquid separating equipment, a dryer and a calcining furnace. According to the comprehensive resourceful treatment device and method, a new technology for comprehensive resourceful treatment of the chlorohydric acid pickling waste liquid is achieved, the advantages of being low in investment and treatment cost and low in energy consumption are achieved, the comprehensive utilization of acid and iron in the waste liquid can be achieved, environment pollution hazards brought by the chlorohydric acid pickling waste liquid are reduced, hydrochloric acid and iron salt can be recovered, nanocrystalline iron oxide with quite economic value can be prepared, and the environmental benefits and the economic benefits are well taken into account.

Description

technical field [0001] The invention relates to the technical field of waste treatment and resource recovery, in particular to a device and method for comprehensive resource recovery of hydrochloric acid pickling waste liquid. Background technique [0002] Pickling is a method of cleaning metal surfaces, and it is also a necessary process for steel production and processing. Its purpose is to remove oxides on the metal surface. The discharged pickling waste liquid not only contains high-concentration waste acid, but also contains a large amount of heavy metal ions, which is highly corrosive and will cause serious pollution and harm to the surrounding environment. my country's environmental protection department has already included pickling waste liquid in the national hazardous waste list. Hydrochloric acid is the mainstream cleaning agent in the steel cleaning process. Generally, the hydrochloric acid cleaning agent for steel pickling has a hydrochloric acid content of 5-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01G49/06C02F103/16
Inventor 胡勤海裴毓雯唐剑昭裴冬冬徐俊鹏
Owner 浙江天川环保科技有限公司
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