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Arsenic-containing solid material and method for production thereof

A solid-state, iron-arsenic technology, applied in arsenic compounds, chemical instruments and methods, iron compounds, etc., can solve the problems of increased dissolution and insufficient arsenic removal, shortening the reaction time, improving the dissolution prevention effect, and stabilizing And the effect of excellent arsenic elution prevention effect

Inactive Publication Date: 2010-01-27
DOWA METALS & MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should also be considered that if the amount of washing water used is too small or the washing method is not perfect, the arsenic attached to the particles will not be sufficiently removed.
In addition, when the environment of the deposited and stored iron-arsenic compounds is biased towards the alkali side, the amount of arsenic eluted from scorodite crystals may also increase.

Method used

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  • Arsenic-containing solid material and method for production thereof
  • Arsenic-containing solid material and method for production thereof
  • Arsenic-containing solid material and method for production thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0020] "Preparation of arsenic solution"

[0021] As a raw material solution for synthesizing scorodite-type iron-arsenic compounds, an arsenic-containing solution (a solution in which arsenic is dissolved) was prepared. The arsenic-containing liquid can be produced by leaching arsenic from arsenic-containing substances generated in a smelting process or the like. As this method, for example, methods disclosed by the present applicant in Japanese Patent Application No. 2006-339154, Japanese Patent Application No. 2006-339156, etc. can be preferably used. For example, when using As 2 S 3 Or when the sulfide represented by the composition formula of CuS is the main arsenic-containing substance, oxygen is added to the slurry in which the above-mentioned sulfide is suspended in water, and the leaching reaction of arsenic is carried out while stirring. After the reaction, the slurry is solid-liquid The resulting liquid is separated and recovered to obtain an arsenic-containing l...

Embodiment 1

[0048] The same operation as in Comparative Example 1 was carried out to obtain a dry solid product composed of scorodite-type iron-arsenic compound.

[0049] On the other hand, iron oxide of a special grade reagent (manufactured by Kanto Chemical Co., Ltd.) was prepared as the iron oxide.

[0050] The X-ray diffraction pattern was measured for this iron oxide (measurement conditions are the same as above). As a result, the iron oxide was identified as hematite (α-Fe 2 o 3 ).

[0051] In addition, the particle size distribution was measured using a laser diffraction particle size distribution analyzer (manufactured by Horiba, Ltd., LA-500). As a result, the average particle size D of the iron oxide was 50 is 20.22 μm.

[0052] Then, the BET specific surface area was measured by the BET one-point method (using Yuasa Ionix Co., Ltd., Monosorb), and the BET specific surface area of ​​the iron oxide was 4.64 m 2 / g.

[0053] In the dissolution test carried out in Comparative...

Embodiment 2

[0056] The dissolution test was performed under the same conditions as in Example 1, except that a slurry containing 5 parts by mass of iron oxide per 100 parts by mass of the iron-arsenic compound was used as the slurry for the dissolution test. As a result, the pH after shaking was 3.79, and the arsenic concentration was 0.04 mg / L.

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Abstract

The invention provides an arsenic-containing solid material comprising 100 parts by mass of a scorodite-type iron-arsenic compound and 1 part by mass or more of an iron oxidation compound, wherein the scorodite-type iron-arsenic compound is synthesized by adding an oxidizing agent to an acidic aqueous solution containing a pentavalent arsenic ion and a bivalent arsenic ion to cause the precipitation of the iron-arsenic compound to proceed while agitating the solution, and terminating the precipitation at a pH value of 1.2 or lower. The iron oxidation compound may be goethite, hematite, or a mixture thereof. It is preferred to use an iron oxidation compound having a BET specific surface area of 3 m<2> / g or more, preferably 20 m<2> / g or more.

Description

technical field [0001] The invention relates to a solid substance mainly composed of a scorodite-type iron-arsenic compound, in particular to an arsenic-containing solid substance whose dissolution of arsenic is significantly suppressed, and a preparation method thereof. Background technique [0002] In non-ferrous smelting, various smelting intermediates are produced, and there are substances that can be used as smelting raw materials in various forms. Valuable metals are contained in these smelting intermediate products and smelting raw materials, but on the other hand, elements harmful to the environment such as arsenic are contained. As a treatment method for arsenic, a method of fixing arsenic in a solution in an arsenic compound by combining arsenous acid with iron, calcium, etc. is proposed. [0003] The arsenic compound recovered as a precipitate is stored or discarded, but it is important that the arsenic elution of the above-mentioned compound is small. As an ars...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B01D9/02
CPCC01P2006/12C01G28/02C01G49/02C01G49/06C22B30/04C01G28/00C01G49/0018C22B7/006C22B3/20C22B3/44C01P2004/61Y02P10/20B01D9/02C01G49/00
Inventor 藤田哲雄田口良一久保尚司
Owner DOWA METALS & MINING CO LTD
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