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Method for abstracting chromium and nickel salt for stainless steel acid-washing wastewater

A technology of pickling wastewater and extraction methods, which is applied to chemical instruments and methods, nickel compounds, chromium compounds, etc., can solve the problems of large dosage of chemicals, high economic costs, secondary pollution, etc., and achieve convenient control, good economic benefits, Simple operation effect

Active Publication Date: 2008-01-02
SONGYANG COUNTY ZHONGQI ENVIRONMENTAL ENGCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, enterprises generally treat acid wastewater to meet the discharge standards, and then discharge it. However, such discharge still has a lot of problems. First, the iron, chromium, and nickel salts in it form secondary pollution with the discharge. In the treatment process for discharge, a large amount of lye is used, and the amount of chemicals is also very large, and the economic cost is relatively large

Method used

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  • Method for abstracting chromium and nickel salt for stainless steel acid-washing wastewater

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: According to the implementation process shown in the accompanying drawings, 1 liter of production wastewater from a stainless steel company was taken, and the measured concentration of chromium and nickel was 120 mg / L. Then add 3 grams of milk of lime, stir evenly, the measured pH is 3.8, filter after standing, remove the solid matter, add 2 grams of soda ash to the filtrate, and measure the pH to be 7.8, then filter, the filtrate can be discharged, and then go to the solid Add sulfuric acid to the filter residue, adjust the pH to 1.8, filter again, and remove the solid matter. The main component is iron salt, and the filtrate is a solution containing chromium and nickel salt. The measured content is 9 g / L of chromium and 10.8 g / L of nickel.

Embodiment 2

[0024] Embodiment 2: By the same method as in Embodiment 1, 1 liter of production wastewater from a stainless steel company was obtained, and it was measured that the concentration of chromium and nickel was 130 mg / L. Then add 3.2 grams of milk of lime, stir evenly, the measured pH is 3.0, filter after standing, remove the solid matter, add 2.3 grams of soda ash to the filtrate, and measure the pH to be 7.3, then filter, the filtrate can be discharged, and then go to the solid Add hydrochloric acid to the filter residue, adjust the pH to 1.5, filter again, and remove the solid matter, which contains iron salt as the main component. The filtrate is a solution containing chromium and nickel salt, and the measured content of chromium is 9.4 g / L and nickel is 12.1 g / L.

Embodiment 3

[0025] Embodiment three: by the same method of embodiment one, take 1 liter of production waste water from certain stainless steel company, process, draw list (measure by implementation steps).

[0026] Preface

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Abstract

The invention discloses a disposing method of acid waste water, in particular to an extracting method of chromium and nickel salt in the stainless steel acid waste water, which comprises the following steps: removing harmful material in the acid waste water step by step; adding calcium salt; controlling the pH value at 2.0-4.0; removing fluorine ion; adding strong base or pure alkaline; controlling the pH value between 7.0 and 8.0; filtering; realizing the discharge standard effectively; acidifying and oxidizing the filter slag; controlling the pH value at 1.0-4.0; removing the iron ion; obtaining the residual filtrate as the extracted precious metal chromium and nickel salt. The invention improves the economic benefit, which is fit for disposing kinds of waste water for stainless steel manufacturing enterprise and similar enterprises.

Description

technical field [0001] The invention relates to a method for extracting metal salts from acid wastewater, in particular to a method for extracting chromium and nickel salts from stainless steel acid wastewater. technical background [0002] The treatment of existing stainless steel pickling wastewater basically adopts the methods of aeration, neutralization, and precipitation. Because the traditional method does not consider the recovery of heavy metals in wastewater, but only considers the treatment and discharge, the overall operating cost is too high, and the dried sewage Mud often causes secondary pollution by heavy metals due to improper disposal, and more importantly, it will cause waste of resources. A large amount of iron, chromium and nickel salts are contained in stainless steel acid wastewater. At present, enterprises generally treat acid wastewater to meet the discharge standards, and then discharge it. However, such discharge still has a lot of problems. First,...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01G37/00C02F9/04C02F1/66C02F101/22
Inventor 陈启松
Owner SONGYANG COUNTY ZHONGQI ENVIRONMENTAL ENGCO
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