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Method for producing a poorly soluble calcium-arsenic compound

A technology of arsenic compounds and calcium compounds, applied in the direction of arsenic compounds, calcium/strontium/barium compounds, chemical instruments and methods, etc., can solve problems such as combination without serious consideration

Inactive Publication Date: 2013-11-27
OUTOTEC OYJ
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  • Abstract
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  • Claims
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Problems solved by technology

The most insoluble arsenic compounds in the neutral pH range are eg arsenates of zinc, copper and lead, but incorporation of arsenic into these has not been seriously considered due to the amount of this valuable metal that would remain in the waste. valuable metal

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  • Method for producing a poorly soluble calcium-arsenic compound

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Embodiment Construction

[0020] The purpose of the process according to the invention is to remove arsenic from acidic aqueous solutions produced in connection with metal production. Such an aqueous solution may also be formed in connection with gas scrubbing, and it may be, for example, a solution of impure sulfuric acid, such as used acid. The aqueous solution to be treated may contain tens of grams per liter of arsenic and should be removed to such an extent that it is possible to recycle the solution back to leaching, gas scrubbing or another treatment step. When aqueous solutions have been used to leach metals from minerals containing them, the aqueous solutions generally contain acids and may have a pH of about 0-1. The arsenic in this solution is at least partially in the trivalent form (As 3+ ), so it must be oxidized to pentavalent (As 5+ ).

[0021] pass figure 1 Methods according to the invention are described herein. The acidic feed solution should be neutralized in the neutralization...

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Abstract

The invention relates to a method for precipitating pentavalent calcium arsenate from an acidic solution, in which arsenic is at least partially in trivalent form. The acidic solution is neutralised before being routed to an arsenic oxidation stage,and a poorly soluble calcium-arsenic compound is precipitated from the solution, in which all the arsenic is pentavalent.

Description

field of invention [0001] The present invention relates to a method for the precipitation of calcium pentavalent arsenate from an acidic solution in which arsenic is at least partially in the pentavalent form. The acidic solution is neutralized and insoluble calcium-arsenic compounds are precipitated from the solution, all arsenic in which is pentavalent, before being sent to the arsenic oxidation stage. Background technique [0002] Arsenic occurs naturally in many different forms. In addition to the valuable metals themselves, sulfide minerals often also contain arsenic, and thus arsenic-containing mine water and other industrial wastewater are also often produced in connection with the recovery of valuable metals. Arsenic is also the most important impurity to be removed in connection with the recovery of non-ferrous metals. The use of arsenic has not increased with its recovery, so most of the arsenic has to be stored as waste. Since arsenic and its compounds are toxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C01G28/02C02F1/52
CPCC01F11/00C02F1/5236C01F11/46C01G28/023C01F5/22C22B30/04C01G28/02C02F1/52
Inventor T·瑞希玛基
Owner OUTOTEC OYJ
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