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Method for extracting arsenic from pyrite cinder

A technology of sulfuric acid residue and extraction efficiency, which is applied in the field of arsenic extraction to solve environmental problems, increase added value and realize comprehensive utilization.

Inactive Publication Date: 2010-01-06
SHAOTONG TIANYUAN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] What the present invention aims to solve is the problem of extracting arsenic from sulfuric acid slag, and provides a method for extracting arsenic in sulfuric acid slag, which not only realizes the utilization of arsenic, but also realizes the problem of safe utilization of the sulfuric acid slag after extracting arsenic.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: get a kind of sulfuric acid slag, through analyzing various elements by weight ratio iron 57.12%, phosphorus 1.11%, arsenic 1.51%, silicon dioxide 8.22%, magnesium oxide 8.78%, calcium oxide 12.31%, dioxygen trioxide Aluminum 4.44%, sulfur 1.32%, lead 1.56%, zinc 2.18%, potassium oxide 1.31%, sodium oxide 0.14%.

[0018] After taking 200g of sulfuric acid slag and passing through a 60-mesh sieve and 800 gauss magnetic separation, the refined iron powder is taken for chemical separation, and the hydrochloric acid used in the chemical selection is 30% hydrochloric acid by weight. Add 194ml of water to the refined iron powder to form a slurry, add 6ml of hydrochloric acid to the slurry, stir at normal temperature and pressure for 30 minutes, filter, and separate the solid and liquid; add 188ml of water to the separated refined iron powder, then add 12ml of hydrochloric acid, After stirring for 30 minutes, filter, wash, and separate the solid and liquid; add 1...

Embodiment 2

[0019] Embodiment 2: get the sulfuric acid slag 5t of identical composition with embodiment 1, after screening through 60 purpose sieves and the magnetic separation of 800 gauss, remaining fine iron powder 4.75t carries out chemical separation, and the hydrochloric acid that adopts in chemical selection is 30% by weight % hydrochloric acid. Add 4.75m water to 4.75t refined iron powder 3 To form a slurry, add 0.15m hydrochloric acid to the slurry 3 , stirred at normal temperature and pressure for 30 minutes and then filtered to separate the solid from the liquid; add 4.75m of water to the separated fine iron powder 3 After adding hydrochloric acid 0.25m 3 , stirred at normal temperature and pressure for 30 minutes, filtered, washed, and separated from solid and liquid; added 4.5m water to the separated fine iron powder 3 After adding hydrochloric acid 0.5m 3 , stirred at normal temperature and pressure for 30 minutes, filtered, washed, and separated from solid to liquid. A...

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Abstract

The invention provides to a method for extracting arsenic from pyrite cinder and relates to a processing technique of pyrite cinder, in particular to a method for extracting arsenic from pyrite cinder. In the method, fine iron powder is firstly separated from pyrite cinder through screening and magnetic separation; and the fine iron powder is soaked in hydrochloric acid and then filtered to separate the fine iron powder from solution containing arsenic acid. The method is characterized in that sulfur dioxide is added into the solution containing arsenic acid to produce arsenic trioxide, and the arsenic trioxide is extracted out through liquid-solid separation. The technique of the invention realizes extraction of arsenic from pyrite cinder and comprehensively utilizes other useful components, thereby solving the problem of environmental pollution caused by pyrite cinder pile containing arsenic, realizing comprehensive utilization of pyrite cinder and improving the added value of waste residue utilization.

Description

technical field [0001] The invention relates to a process for treating sulfuric acid slag, in particular to a method for extracting arsenic from sulfuric acid slag. Background technique [0002] In the 18th century, Swedish chemist and mineralogist Brandt clarified the relationship between arsenic and arsenic trioxide and other arsenic compounds. Lavoisier confirmed Brandt's research results and believed that arsenic was a chemical element. So far, arsenic has been widely known. As an alloy additive, arsenic is used to produce lead projectiles, printing alloys, brass (for condensers), battery grids, wear-resistant alloys, high-strength structural steel and corrosion-resistant steel, etc.; high-purity arsenic is Raw materials for preparing compound semiconductors such as gallium arsenide and indium arsenide are also doping elements for semiconductor materials germanium and silicon. These materials are widely used as diodes, light-emitting diodes, infrared emitters, lasers, et...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B3/46C22B30/04
CPCY02P10/20
Inventor 陆世强
Owner SHAOTONG TIANYUAN IND
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