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Method for quickly removing arsenic in zinc oxide with high arsenic content and producing zinc sulfate by using zinc ash and sodium peroxycarbonate of iron and steel plant

A technology of sodium percarbonate and high-arsenic zinc oxide, applied in the direction of zinc sulfate, etc., can solve the problems of complex operation of hydrogen peroxide, achieve good demonstration and promotion value, avoid secondary pollution, and have wide adaptability

Inactive Publication Date: 2013-12-25
HENGYANG NORMAL UNIV
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Problems solved by technology

Handling with hydrogen peroxide is therefore complicated: wear appropriate protective clothing, gloves and goggles or a mask

Method used

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Embodiment 1

[0048] A method for quickly removing arsenic in high-arsenic zinc oxide and producing zinc sulfate by using zinc ash and sodium percarbonate from iron and steel plants. First, use a magnetic separator (with a cylinder diameter of 600mm, a cylinder length of 1200mm, and an average magnetic induction intensity of the cylinder surface of 100~ 600mT) for magnetic separation, so that the iron content in the raw material is controlled within 20%. Then analyze the high-arsenic zinc oxide containing 40.69% zinc, 26.54% lead, 1.50% arsenic, and 2.28% iron; the iron and steel plant zinc ash contains 33.65% zinc, 16.87% iron, 1.18% lead, and arsenic 3 After 10 minutes of stirring, slowly add 0.8 tons of concentrated sulfuric acid for leaching. The pH of the leaching end point is controlled at about 3.0. own heat to control), the final reaction volume is 4.8m 3 . After the leaching reaction is completed, gradually add 50 kg of industrial zinc oxide to the same reaction tank, adjust the p...

Embodiment 2

[0050] A method for quickly removing arsenic in high-arsenic zinc oxide and producing zinc sulfate by using zinc ash and sodium percarbonate from iron and steel plants. First, use a magnetic separator (with a cylinder diameter of 600mm, a cylinder length of 1200mm, and an average magnetic induction intensity of the cylinder surface of 100~ 600mT) for magnetic separation, so that the iron content in the raw material is controlled within 20%. Then the high-arsenic zinc oxide contains 47.66% zinc, 26.63% lead, 1.90% arsenic, and 2.36% iron; the zinc ash in iron and steel plants contains 30.53% zinc, 18.56% iron, 1.16% lead, and arsenic 3 , Slurry for 20 minutes, add 1.84 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 10.4m 3 ; After the leaching is completed, gradually add 108 kg of industrial zinc oxide in the same reaction tank, ad...

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Abstract

The invention discloses a method for quickly removing arsenic in zinc oxide with high arsenic content and producing zinc sulfate by using zinc ash and sodium peroxycarbonate of an iron and steel plant. The purpose of removing arsenic in liquor is realized by leaching iron in a raw material and then carrying out oxidizing and hydrolyzing reactions to generate Fe(OH)3 by means of a characteristic of Fe(OH)3 which is reacted with arsenic acid at the pH of 3.0-5.4 to generate FeAsO4 precipitates. The method specifically comprises the following steps: calculating the use levels of the two raw materials according to the laboratory reports of arsenic, ferrum and zinc elements in zinc oxide with high arsenic content and zinc ash of the iron and steel plant; proportioning the raw materials; pulpifying; leaching; adjusting the pH value; oxidizing to remove iron and arsenic by sodium peroxycarbonate; neutralizing; carrying out filter pressing; purifying; then, carrying out evaporative crystallization, thereby obtaining a qualified zinc sulfate product. Arsenic enters into smelting waste to be cured in the smelting process, so that harmless 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] According to the "Twelfth Five-Year" special plan for the lead and zinc industry, by 2015 my country's lead smelting capacity will reach 5.5 million tons, with an annual output of more than 3 million tons of refined lead. At the same time, in 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 more than 300,000 tons. 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 ar...

Claims

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Application Information

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