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Complete equipment for stainless steel pickling wastewater treatment and resource recycling and treatment process

A technology for pickling wastewater and a complete set of devices is applied in the fields of metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. And other issues

Pending Publication Date: 2017-04-19
MAIWANG INT BUSINESS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the operating cost of biochemical denitrification is relatively high, which restricts the purification treatment of pickling wastewater

Method used

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  • Complete equipment for stainless steel pickling wastewater treatment and resource recycling and treatment process
  • Complete equipment for stainless steel pickling wastewater treatment and resource recycling and treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0048] see figure 1 , figure 2 , this embodiment consists of a pretreatment section, a membrane treatment section, and a fractional crystallization section.

[0049] The pretreatment section includes: storage adjustment tank 101, neutralization oxidation reaction tank 102, flocculation reaction tank 103, sedimentation tank 104, filter 105, intermediate pool 106, sludge dehydration unit 107, adjustment tank lift pump 108, blower 109, hydrogen Sodium oxide dosing device 110 , polymer flocculant dosing device 111 , polyaluminum chloride dosing device 112 .

[0050] The membrane treatment section includes: self-cleaning filter 201, ultrafiltration device 202, ultrafiltration outlet tank 203, security filter 204, reverse osmosis device 205, reverse osmosis concentrated water tank 206, membrane softening device 207, concentration membrane water inlet tank 208, ...

Embodiment 2

[0080] The second embodiment is the same as the first embodiment, except that the filter 105 is a multimedia filter or a fiber rotary disk filter device. The concentrated membrane device 209 is a high-pressure reverse osmosis disc membrane or a vibrating membrane or a high-pressure forward osmosis membrane. The membrane softening device 207 is precipitation+ultrafiltration. The evaporative concentrator 303 is multi-effect evaporative concentration. The evaporation crystallizer 305 is a multi-effect evaporation crystallizer. The defluorination agent in the defluorination tank 304 is calcium chloride.

Embodiment 3

[0082] The present embodiment is the same as Embodiment 1, except that the sodium hydroxide dosing device 110 is a sodium hydroxide+calcium chloride (or lime) dosing device in the pretreatment, and a medicament softening agent is added after the intermediate pool 106 of the pretreatment section. Dosing device and reaction sedimentation tank, cancel the crystal separation system of sodium fluoride (sedimentation tank containing sodium fluoride crystal slurry, centrifuge feed pump, centrifuge, centrifuge mother liquor tank, crystal storage tank). A weak acid cation exchange device is added before the reverse osmosis device.

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Abstract

Complete equipment for stainless steel pickling wastewater treatment and resource recycling and a treatment process are disclosed. A pretreatment section, a membrane treatment section and a quality-based crystallization section are involved. The invention is characterized in that a storage regulating basin, a neutralization-oxidation reaction tank, a flocculent precipitation tank, a filter, an ultrafiltration and reverse osmosis system, a membrane concentration system and an evaporation and concentration and quality-based crystallization system are mutually connected end to end through pipelines. Each dosage device is respectively arranged on corresponding section. According to the order of the pretreatment section, the membrane treatment section and the quality-based crystallization section, thirteen steps are included for the operation. By the treatment process of chemical reactive precipitation, membrane separation concentration and evaporation and quality-based crystallization, various acid wastewaters mainly containing acid and inorganic salt can be treated to realize recycling of wastewater. After crystallization of salt, sodium sulfate (and sodium chloride), sodium nitrate, sodium fluoride and other products can be recycled, and zero-discharge resource utilization of stainless steel pickling wastewater is realized. Meanwhile, system sludge yield is greatly reduced such that the burden of sludge treatment is decreased.

Description

technical field [0001] The invention relates to environmental protection equipment, in particular to a complete device and process for stainless steel pickling wastewater treatment and resource recovery. Background technique [0002] Stainless steel is widely used because of its excellent corrosion resistance and good appearance. In the production process of stainless steel, it is inevitable to go through annealing, normalizing, quenching, welding and other processing processes, and black oxide scales often appear on the surface. Oxide scale not only affects the appearance quality of stainless steel, but also has an adverse effect on the subsequent processing of the product. Therefore, it must be removed by surface treatment methods such as pickling and polishing before subsequent processing. [0003] Iron oxide scale will be produced on the surface of stainless steel, and its main components are FeO, Fe 2 o 3 , NiO2, Cr 2 o 3 , Fe 3 o 4 、FeO·Cr 2 o 3 , Ni·Fe 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/02C01D3/06C01D5/00C01D9/00C02F103/16
Inventor 袁蔚文钱媛媛冯杰徐河民常定明
Owner MAIWANG INT BUSINESS SHANGHAI
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