High-valued treatment method for stainless steel pickling waste water

A technology of pickling wastewater and treatment method, applied in chemical instruments and methods, crystal growth, single crystal growth and other directions, can solve the problems of no recovery of valuable metals, no further recovery of calcium ions, etc., and achieves easy operation and is conducive to industrial production. , to achieve the effect of resource recycling

Active Publication Date: 2018-10-09
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, because the method for stainless steel pickling wastewater treatment in the prior art is purely in order to meet the national discharge standard, only involves the removal of fluoride ions, does not recycle valuable metals therein, and does not further recycle calcium ions therein. Therefore, there is an urgent need for a method for high-value treatment of stainless steel pickling wastewater

Method used

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  • High-valued treatment method for stainless steel pickling waste water

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Embodiment 1

[0045] A high-value treatment method for stainless steel pickling wastewater, comprising:

[0046] Take 500ml of stainless steel pickling wastewater, which contains 50g / L of NO 3 - , 40g / L of F - , 37g / L of Fe 3+ , 8g / L Cr 3 + , 5g / L Ni 2+, 80g / L residual acid; add 87.6ml molar concentration of 4mol / L cerium nitrate, lanthanum mixed solution (1:10 mix) and 7ml molar concentration of 2mol / L oxalic acid solution for deep defluorination, defluorination reaction 0.5 h, liquid phase and slag phase are obtained after defluorination is completed, and the slag phase is a mixture of cerium fluoride and lanthanum fluoride; the mixture of cerium fluoride and lanthanum fluoride is alkali-dissolved with 200g / L potassium hydroxide solution to obtain fluoride The mixture of potassium, cerium hydroxide and lanthanum hydroxide; the mixture of cerium hydroxide and lanthanum hydroxide is acid-dissolved and regenerated with the nitric acid produced in the 0.8mol / L nitric acid regeneration p...

Embodiment 2

[0048] A high-value treatment method for stainless steel pickling wastewater, comprising:

[0049] Take 500ml of stainless steel pickling wastewater, which contains 150g / L of NO 3 - , 20g / L of F - , 36g / L of Fe 3+ , 10g / L Cr 3+ , 3.5g / L Ni 2+ , 30g / L residual acid; adding 43.8ml molar concentration of 4mol / L cerium nitrate, lanthanum mixed solution (1:6 mixing) and 7.5ml molar concentration of 1.5mol / L oxalic acid solution for deep defluorination, defluorination After reacting for 3 hours, a liquid phase and a slag phase are obtained after the defluorination is completed, and the slag phase is a mixture of cerium fluoride and lanthanum fluoride; The mixture of sodium chloride, cerium hydroxide and lanthanum hydroxide; the mixture of cerium hydroxide and lanthanum hydroxide is regenerated with nitric acid produced in the 2.4mol / L nitric acid regeneration process, and all the acid-dissolved regeneration products are returned to the deep defluorination process; Add calcium ...

Embodiment 3

[0051] A high-value treatment method for stainless steel pickling wastewater, comprising:

[0052] Take 500ml of stainless steel pickling wastewater, which contains 100g / L of NO 3 - , 60g / L F - , 30g / L of Fe 3+ , 9g / L of Cr 3+ , 4.3g / L Ni 2+ , 40g / L residual acid; add 131.4ml molar concentration of 4mol / L cerium nitrate, lanthanum mixed solution (1:1 mixing) and 9ml molar concentration of 0.5mol / L oxalic acid solution for deep defluorination, defluorination reaction After 3.5h, the liquid phase and the slag phase are obtained after the defluorination is completed. The slag phase is a mixture of cerium fluoride and lanthanum fluoride; The mixture of potassium chloride, cerium hydroxide and lanthanum hydroxide; the mixture of cerium hydroxide and lanthanum hydroxide is regenerated with nitric acid produced in the 1.6mol / L nitric acid regeneration process, and all the acid-soluble regeneration products are returned to the deep defluorination process; Add calcium oxide to th...

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Abstract

The invention provides a high-valued treatment method for stainless steel pickling waste water, and belongs to the technical field of waste water high-valued treatment. The method comprises the following steps that firstly, a rare earth nitrate solution and oxalic acid are added into the stainless steel pickling waste water for defluorination treatment, and a slag phase and a liquid phase are obtained; alkali dissolution separation is carried out on the slag phase, easily-soluble fluoride and a corresponding rare earth hydroxide precipitate are obtained, then acid dissolution and regenerationis carried out on the hydroxide precipitate through nitric acid, so that a rare earth nitrate solution is obtained, and the regenerated rare earth nitrate solution is returned to the defluorination treatment process; and meanwhile, calcium oxide or calcium carbonate is added to the liquid phase to obtain iron, chromium, nickel products and calcium nitrate solutions, then regeneration treatment iscarried out on the calcium nitrate solution through the nitric acid, so that nitric acid and a calcium-containing calcium sulfate crystal whisker are obtained, and the regenerated nitric acid is usedfor the stainless steel pickling process; and finally, microwave treatment is carried out on the calcium-containing calcium sulfate crystal whisker, so that hemihydrate calcium sulfate crystal whiskeror anhydrous calcium sulfate whisker are obtained. According to the high-valued treatment method for the stainless steel pickling waste water, the high-valued treatment of the stainless steel pickling waste water can be realized.

Description

technical field [0001] The invention relates to the technical field of high-value wastewater treatment in the aspect of environmental protection, in particular to a high-value treatment method for stainless steel pickling wastewater. Background technique [0002] In the process of manufacturing stainless steel, or before electroplating and spraying of steel components, in order to remove oxides on the surface, it is generally necessary to use mixed acid to treat the surface. However, after the treatment, a large amount of stainless steel pickling wastewater will be produced, which contains a large amount of fluorine ions in addition to valuable metal ions such as iron, chromium, and nickel. In the prior art, the focus is only on the defluorination treatment of stainless steel pickling wastewater, and no attention is paid to the recovery and utilization of valuable metals therein. [0003] Chinese patent CN104370389A discloses a process for removing fluorine from pickling wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/36C22B7/00C30B29/46C30B29/62
CPCC22B7/006C23G1/36C30B29/46C30B29/62
Inventor 马保中王成彦陈永强邵爽邢鹏
Owner UNIV OF SCI & TECH BEIJING
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