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Method for recovering nickel in stainless steel pickling waste water

A technology of pickling wastewater and recovery methods, which is applied in metallurgical wastewater treatment, chemical instruments and methods, water pollutants, etc., can solve problems such as waste of nickel-containing resources, mixing of various heavy metals, etc., to improve intelligent control and reduce excessive effluent Effect

Pending Publication Date: 2019-05-21
南通科闻智能科技有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for recovering nickel in stainless steel pickling wastewater, which is used to solve the problem that the wastewater treatment process in the prior art is simple to control, resulting in the mixing of various heavy metals, resulting in the waste of nickel-containing resources

Method used

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Embodiment Construction

[0025] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. example.

[0026] The invention provides a method for recovering nickel in stainless steel pickling wastewater, comprising the following steps:

[0027] (1) The stainless steel pickling wastewater is pumped into the chromium reduction reaction tank, and sodium bisulfite is dosed quantitatively through the dosing pump to reduce the hexavalent chromium to trivalent chromium, and the redox potential is monitored in real time by the online ORP meter to control the sodium bisulfite. When the ORP is higher than 400mV, the dosing pump is started, and when the ORP is lower than 250mV, the dosing pump is stopped;

[0028] (2) the waste w...

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Abstract

The invention relates to a method for recovering nickel in stainless steel pickling waste water. The method comprises the following steps that sodium bisulfite is quantitatively added through a dosingpump to reduce hexavalent chromium; a sodium hydroxide solution is added to adjust the PH to be 3-4, and the sodium hydroxide solution is added to adjust the PH to be 7-7.5; oxygenation aeration is conducted for 0.5-1 h, and ferrous iron is converted into ferric iron; a flocculating agent is added to remove hydroxide precipitates formed by iron ions and trivalent chromium ions in the waste water;supernatant flows into an intermediate pool, and then flows through a fluoride removal filter to remove fluoride; the sodium hydroxide solution is added to adjust the PH to be 9-10, the flocculatingagent is added to make nickel ions in the waste water form nickel hydroxide, and the waste water flows through a micro-filtration membrane to recover nickel hydroxide and then is discharged. Accordingto the precipitation effect of different metal ions at different PH values, the heavy metal nickel in the waste water can be separated from comprehensive sludge for resource recovery.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for recovering nickel in stainless steel pickling wastewater. Background technique [0002] There are a large number of heavy metals such as nickel and chromium in stainless steel pickling wastewater. At present, the commonly used processes for the treatment of heavy metal ions include precipitation, adsorption, membrane filtration, and ion exchange. [0003] At present, there are two targets for the removal of heavy metal ions in stainless steel pickling wastewater, one is based on standard discharge, and the other is based on zero discharge. The precipitation process is the main method for the removal of heavy metal ions for the two targets. However, due to the simple control in the treatment process, the sludge formed by the heavy metal ions in the wastewater is mixed together, resulting in the waste of nickel-containing resources and the difficulty of resource reg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01G53/04C02F101/20C02F101/22C02F103/16
Inventor 徐庆惠韩小巍徐康健
Owner 南通科闻智能科技有限公司
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