Arsenic-alkali slag reduction smelting treatment method

A treatment method and technology for arsenic-alkali slag, applied in chemical instruments and methods, alkali metal compounds, alkali metal carbonates, etc., can solve the problems of long process, difficult safe disposal of arsenic, difficult separation of arsenic and antimony, etc., and achieve environmental protection. problems, solving the effect of arsenic dispersion and reducing production costs

Active Publication Date: 2018-06-29
湖南锐异资环科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the problems existing in the existing arsenic-alkali slag treatment process, such as difficult separation of arsenic and antimony, long process, and difficulty in safe disposal of arsenic, the purpose of the present invention is to provide a method that can efficiently

Method used

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  • Arsenic-alkali slag reduction smelting treatment method

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Embodiment 1

[0034] The arsenic-alkali slag produced by an antimony smelter is used as the raw material, and the chemical composition of the raw material is: As9.68%, Sb26.2%, Pb5.85%, Na22.88%. Take 100kg of the arsenic-alkali slag and carbon powder and mix them evenly at a mass ratio of 100:12, then send them to the reduction smelting furnace, raise the temperature to 1100°C and keep the reduction environment for 3 hours, then stop heating, and discharge the slag from the bottom of the reduction furnace twice to obtain crude Antimony and reducing slag, metal arsenic is taken out from the condensation chamber, the purity is >99% after testing, and the recovery rates of antimony and lead are both greater than 98%. The reduced slag is leached with hot water, the leaching temperature is controlled at 80°C, the leaching time is 2 hours, and the stirring speed is 500rpm. 2 CO 3 solution, which was concentrated and crystallized to obtain Na2 CO 3 The crystal and crystallization mother liquor ...

Embodiment 2

[0036] The arsenic-alkali slag produced by an antimony smelter is used as the raw material, and the chemical composition of the raw material is: As9.68%, Sb26.2%, Pb5.85%, Na22.88%. Take 100kg of the arsenic-alkali slag and carbon powder and mix them uniformly according to the mass ratio of 100:16, then send them to the reduction smelting furnace, close the reduction furnace, use a vacuum pump to evacuate, when the vacuum degree is less than 500Pa, start to heat up to 950°C and maintain the reduction environment for 1.5 hours Stop heating, discharge the slag twice from the bottom part of the reduction furnace to obtain crude antimony and reduced slag respectively, take out the metal arsenic from the condensation chamber, the purity is >99% after testing, the recovery rate of both antimony and lead is greater than 98%, and the reduced slag is used as the desulfurization slag. The arsenic agent is returned to the antimony refining and arsenic removal process.

Embodiment 3

[0038] The arsenic-alkali slag produced by an antimony smelter is used as the raw material, and the chemical composition of the raw material is: As9.68%, Sb26.2%, Pb5.85%, Na22.88%. Take 100kg of the arsenic-alkali slag and carbon powder and mix them evenly at a mass ratio of 100:10, then send them to the reduction smelting furnace, close the reduction furnace, use a vacuum pump to evacuate, and when the vacuum degree is less than 50Pa, start to heat up to 800°C and maintain the reduction environment for 3 hours. Heating was stopped, and the slag was discharged twice from the bottom part of the reduction furnace to obtain crude antimony and reduced slag respectively. The metal arsenic was taken out from the condensation chamber, and the purity was detected to be >99%, and the recovery rates of both antimony and lead were greater than 98%. The solid ratio is 5:1, stirring and leaching at room temperature for 0.5h, and the filtered solution is evaporated by a three-effect evapora...

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Abstract

The invention discloses an arsenic-alkali slag reduction smelting treatment method. The method comprises the following steps: mixing arsenic-alkali slag and a carbon reducing agent and performing reduction smelting to obtain arsenic steam, crude antimony and reducing slag; after condensing the arsenic steam, obtaining a metal arsenic product, wherein a main component of the reducing slag is Na2CO3, can be directly used as an arsenic removal agent to be returned back to an antimony refining and arsenic removal procedure, and also can be subjected to a water immersion-concentration-crystallization technology to obtain an Na2CO3 crystal. According to the arsenic-alkali slag reduction smelting treatment method, metal arsenic and the crude antimony are prepared through one-step reduction; meanwhile, the Na2CO3 is regenerated; compared with an existing technology, a flow is simplified and the production cost is reduced; reduction, harmlessness and recycling of the arsenic are realized and the environment protection difficulty is solved; considerable economic benefits are generated and the arsenic-alkali slag reduction smelting treatment method is suitable for being industrially popularized.

Description

technical field [0001] The invention relates to a method for comprehensive recovery of arsenic-alkali slag, in particular to a method for preparing metal arsenic products and crude antimony by reduction smelting of arsenic-alkali slag, belonging to the technical field of nonferrous metallurgy. Background technique [0002] At present, 95% of antimony smelting production process adopts pyrometallurgical smelting process. The pyrochemical antimony smelting process removes impurities and arsenic to produce arsenic-alkali slag, the main components of which are arsenic, antimony and alkali. The purpose of treating arsenic-alkali slag is to recover the valuable metal antimony and eliminate the potential environmental pollution hazards of arsenic-alkali slag. [0003] Arsenic-alkali slag is a dangerous waste that is difficult to treat. The existing treatment methods are mainly divided into pyrotechnics and wet processes. The basic technological process of pyroprocessing arsenic-al...

Claims

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Application Information

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IPC IPC(8): C22B30/02C22B30/04C22B7/00C01D7/00
CPCC01D7/00C22B7/001C22B30/02C22B30/04Y02P10/20
Inventor 刘维梁超覃文庆焦芬李文华
Owner 湖南锐异资环科技有限公司
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