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Method for rapidly removing arsenic in high arsenic zinc oxide through zinc ash and sodium carbonate peroxide in iron and steel plants and producing zinc sulfate

A technology of sodium percarbonate and high-arsenic zinc oxide, applied in the direction of zinc sulfate, etc., can solve the problems of no successful production of zinc sulfate and unsuitability for iron and zinc, and achieve obvious economic and ecological benefits, excellent product quality, adaptable effect

Inactive Publication Date: 2013-09-04
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of raw material has the characteristics of high iron and low zinc, because iron oxides are mostly easily leached by sulfuric acid, so it is not suitable to use acid leaching technology to separate iron and zinc to achieve the purpose of zinc recovery
Except for occasional attempts by individual enterprises, there are basically no successful examples of zinc sulfate production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for quickly removing arsenic in high-arsenic zinc oxide and producing zinc sulfate by utilizing zinc dust from iron and steel plants and sodium percarbonate. First, analyze the high-arsenic zinc oxide containing 40.69% zinc, 28.37% lead, 1.53% arsenic, and 2.28% iron %; iron and steel plant zinc dust contains 30.35% zinc, 40.87% iron, 1.14% lead, and arsenic 3 After 10-20 minutes, slowly add 0.8 tons of sulfuric acid for leaching while stirring. The pH of the leaching end point is controlled at about 3.0. Controlled by its own heat), the volume at the end of the reaction is 4.8 m 3 . After the leaching reaction is completed, add zinc oxide into the same reaction tank, adjust the pH of the solution to 4.5, and detect the Fe in the solution after 0.5 hours of reaction. 2＋ The content is 3.8g / L, and 5.0 kg of oxygen net is added under rapid stirring, so that the Fe in the solution 2＋ and H 3 AsO 3 Fully oxidize, and neutralize with a small amount of zinc oxide...

Embodiment 2

[0023]A method for quickly removing arsenic in high-arsenic zinc oxide and producing zinc sulfate by utilizing zinc ash from iron and steel plants and sodium percarbonate. First, the high-arsenic zinc oxide contains 48.25% zinc, 27.61% lead, 1.92% arsenic, and 2.33% iron ; Iron and steel plant zinc dust contains 28.71% zinc, 42.56% iron, 1.03% lead, and arsenic 3 , slurry for 20 minutes, then add 2.08 tons of sulfuric acid for leaching, the pH of the leaching end point is controlled at 2.0, the reaction time is 2.5 hours, the reaction temperature is 75°C, and the final volume of the reaction is 10.4 m 3 ; After the leaching is completed, add zinc oxide in the same reaction tank, adjust the pH of the solution to 3.5, and react for 0.5 hours to detect Fe in the solution 2＋ The content is 3.85g / L, add 10kg of oxygen net under rapid stirring, and neutralize with lime water at the same time, keep the pH value in the solution stable at 3.5-4.0, react for 30 minutes, take a sample to ...

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PUM

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Abstract

The invention discloses a method for rapidly removing arsenic in high arsenic zinc oxide through zinc ash and sodium carbonate peroxide in iron and steel plants and producing zinc sulfate, which rapidly removes arsenic in high arsenic zinc oxide through zinc ash and sodium carbonate peroxide in iron and steel plants and simultaneously also produces zinc sulfate. By adopting the property that Fe(OH)3 can produce FeAsO4 with arsenic acid when the pH value of Fe(OH)3 is 3.0 to 5.4, iron in raw material is leached out, and Fe(OH)3 is produced through oxidation reaction and hydrolysis reaction, so that the purpose that arsenic is removed from solution is realized. The method comprises the concrete steps of calculating usage amount of high arsenic zinc oxide and zinc ash in iron and steel plants according to laboratory reports of arsenic, iron and zinc elements in the high arsenic zinc oxide and the zinc ash in iron and steel plants, mixing the raw material, slurrying, leaching, pH value adjusting, removing iron and arsenic trough sodium carbonate peroxide oxidation, neutralization, pressure filtration, purification, evaporative crystallization, and finally obtaining qualified zinc sulfate products. Arsenic is subjected to smelting waste solidification during the smelting process, so that hazard-free treatment is realized.

Description

technical field [0001] The invention relates to a method for rapidly removing arsenic in high-arsenic zinc oxide and producing zinc sulfate by utilizing zinc dust from iron and steel plants and sodium percarbonate. Background technique [0002] my country's existing lead smelting capacity is about 3.5 million tons, and the annual output of refined lead is more than 2.8 million tons. During the lead smelting process, 550,000 tons of zinc oxide with a grade of 60% to 70% can be produced every year, of which the zinc content reaches 300,000 tons about. Since the content of arsenic in this low-grade zinc oxide is as high as 1.5% to 2.5%, and arsenic and its compounds are highly toxic substances, the content of arsenic in feed grade, agricultural fertilizer grade and even some zinc sulfate products used in industrial production has been raised. The national standard requires the arsenic content to be below 5PPm, while the requirements abroad (especially the European Union and Nor...

Claims

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Application Information

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IPC IPC(8): C01G9/06
Inventor 邓培红杜红张复兴
Owner HENGYANG NORMAL UNIV
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