Arsenic alkaline slag pyrogenic processing method

A technology for pyrolysis and arsenic-alkali slag, which is applied in the direction of improving process efficiency, can solve problems such as inability to implement, secondary pollution, and increased management costs of antimony smelting enterprises, and achieves easy control of operating conditions, simple and significant process flow. Economic and environmental benefits

Inactive Publication Date: 2009-03-18
湖南宏大锑铅有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large backlog of arsenic and alkali slag increases the management cost of antimony smelting enterprises, and also poses a serious threat to the ecological environment
Most of the previous arsenic-alkali slag treatment technologies were wet leaching and separation. Due to the use of acid, alkali and other substances in the production, secondary pollution occurred in the new environment, and the cost was high. disposal method; the patent No. 200410023055.0 non-polluting arsenic-alkali slag treatment technology uses a closed-circuit water circulation system to improve the secondary pollution of the environment, but further increases the cost
The patent No. 200510085657.3 is a method for detoxifying and increasing profits of arsenic-alkali slag from antimony smelting and a high-temperature energy-saving smelting furnace. The patent discloses a method for treating arsenic-alkali slag by fire, but requires that the furnace temperature be 1400°C-1500°C. Smelting industrial kilns cannot be implemented

Method used

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with embodiment. A kind of pyroprocessing method of arsenic-alkali slag, it comprises the following steps:

[0012] (1) First crush the arsenic-alkali slag to 20 mesh-40 mesh (30 mesh in this embodiment), put it into a reverberatory furnace and melt it into a liquid alloy, and control the temperature at 850°C-950°C (900°C in this embodiment);

[0013] (2) Insert the blowpipe into the bottom of the alloy liquid and feed in the air to stir for 100min-120min (120min in this embodiment);

[0014] (3) According to the content of As ions in the alloy liquid, NaOH is added according to the stoichiometric ratio of As:Na at 1:1, and the Sb in the alloy liquid is controlled to be ≥ 90%, As ≤ 0.26%, and Pb to be 4%-6%;

[0015] (4) Add lead remover, cover the liquid alloy liquid surface, control the temperature at 850°C-950°C (900°C in this embodiment), stir the alloy liquid surface by blowing air through the bl...

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PUM

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Abstract

The invention discloses a method for carrying out pyrogenic attack to arsenic alkali slag by using the prior antimony smelting reverberatory furnace. The method is characterized by comprising the following steps: the arsenic alkali slag is crushed and is added with oxygen in the reverberatory furnace and is melted down and stirred; NaOH is added to alloy liquid for removing arsenic; and a deleading agent is added to the alloy liquid for removing lead. The method has simple process flow, is easy to control the operating condition, can totally convert the arsenic alkali slag into a useful product for utilization or selling; the reclaiming rates of antimony and arsenic reach over 99 percent; the reclaiming rate of lead is close to 100 percent; and the method has remarkable economic benefit and environmental benefit.

Description

Technical field: [0001] The invention relates to a technology for harmless treatment and comprehensive utilization of arsenic-alkali slag, an antimony smelting waste, in particular to a pyroprocessing method for arsenic-alkali slag. Background technique: [0002] At present, my country's refined antimony smelting process mainly adopts the method of adding alkali and blasting to refine antimony to remove arsenic, and produces a large amount of arsenic-alkali slag while producing refined antimony. At present, the stockpile of arsenic-alkali slag in the country has reached 50,000 tons, and it is increasing at a rate of 5,000 to 10,000 tons every year. The arsenic in the arsenic-soda residue mainly exists in the form of sodium arsenate, which is highly toxic and easily soluble in water. A large backlog of arsenic and alkali slag increases the management cost of antimony smelting enterprises, and also poses a serious threat to the ecological environment. Most of the previous ar...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 龚奠平龚海龙李承义
Owner 湖南宏大锑铅有限公司
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