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A method for removing arsenic from ilmenite dust and recovering valuable metals

A valuable metal and ilmenite technology, applied in the field of comprehensive utilization of resources, can solve the problems of high processing cost and low efficiency, and achieve the effects of efficient recovery, low cost and convenient operation.

Active Publication Date: 2019-12-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the technical problems of high cost and low efficiency in the treatment of ilmenite arsenic dust in the prior art, the purpose of the present invention is to provide a method for leaching, transforming and flotation separation of arsenic in ilmenite dust, so as to To achieve the purpose of effectively separating the arsenic component from other metals, and at the same time effectively recover the valuable metals in the leach slag and flotation residual liquid after arsenic removal; this method has the advantages of simple, fast, efficient, simple process, and convenient operation. And it is of great significance to realize the comprehensive utilization of ilmenite dust resource

Method used

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  • A method for removing arsenic from ilmenite dust and recovering valuable metals

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Embodiment 1

[0033] The above method is adopted to treat ilmenite dust containing 6.077% arsenic, 12.88% zinc, and 20.50% iron. Put 600g of ilmenite soot into 3L of sodium hydroxide solution of 18g / L for alkaline leaching. Control the leaching temperature to 90℃ and the leaching time for 1h to make the arsenic oxide and zinc oxide in the ilmenite dust The compound is converted into arsenic salt and zinc salt and dissolved in the leaching solution, and solid-liquid separation is obtained to obtain a leaching solution containing arsenic salt and zinc salt, and a leaching residue containing iron and other valuable metals; slowly add 70g of the leaching solution with a mass fraction greater than 99.5% Benzyl chloride undergoes arsenic transformation reaction, the temperature is controlled at 75℃, the reaction time is 5h, and the sodium benzylarsine solution is obtained; the reacted solution is transferred to the flotation tank, and 500g / t calcium carbonate (-200~+400 Mesh) After fully reacting ...

Embodiment 2

[0043] The above method is adopted to treat ilmenite dust containing 1.98% arsenic, 20.33% zinc, and 32.12% iron. Put 600g of ilmenite soot into 3L of water with a sodium hydroxide concentration of 6g / L for alkaline leaching. Control the leaching temperature to 90℃ and the leaching time to 2h to make the arsenic oxide and zinc oxide compound in the ilmenite dust Converted into arsenic salt and zinc salt, dissolved in the leaching solution, filtered to obtain a leaching solution containing arsenic salt and zinc salt, and a leaching residue containing iron and other valuable metals; slowly add 25g of benzyl chloride with a mass fraction greater than 99.5% to the leaching solution Carry out arsenic transformation reaction to obtain sodium benzylarsine solution, control the temperature at 75℃, and the reaction time is 5h; transfer the reacted solution to the flotation tank, and add 500g / t calcium carbonate (-200~+400 mesh) fully After 30 minutes of reaction, flotation is carried ou...

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Abstract

The invention discloses a method for removing arsenic and recovering valuable metal from ilmenite smoke dust. The method comprises the steps of leaching ilmenite smoke dust through strong alkali to obtain a leaching solution containing arsenate and zincate and iron-containing leaching slag; adding benzyl chloride to the leaching solution to convert arsenate into benzyl-arsine; then adding a particle carrier for adsorbing the benzyl-arsine; fully floating and separating to obtain benzyl-arsine salt; neutralizing the floating separating liquid core, and separating out a zinc hydroxide product; adding water to the iron-containing leaching slag; stirring and mixing the slurry; and then adding a flocculating agent and a collecting agent for floating and separating so as to obtain iron ore concentrate. With the adoption of the method, the purpose of removing arsenic is achieved, and moreover, iron and zinc products can be recovered, so that the resource comprehensive utilization of the ilmenite smoke dust can be realized; and the method is simple, quick, efficient, and low in cost and meets the industrial production.

Description

Technical field [0001] The invention relates to a method for treating ilmenite smoke dust, in particular to a method for leaching, transforming and separating arsenic from ilmenite smoke dust to achieve arsenic removal from ilmenite smoke dust and high-efficiency recovery of valuable metals, and belongs to a comprehensive resource utilization technology Field field. Background technique [0002] Arsenic and its compounds are volatile. Arsenic will be concentrated in the smelting dust during the ilmenite smelting process. It has the characteristics of large output, high content of valuable metals (iron, zinc, gold, silver, antimony), and high toxicity. For these harmful dusts containing arsenic, two processes were generally used in the past: First, the dust with lower arsenic content is directly returned to the smelting process. Although the valuable metals can be used in this way, it will cause arsenic to circulate and accumulate in the production system, leading to deterioratio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B3/12C22B3/44
CPCC22B3/12C22B3/44C22B7/008C22B7/02Y02P10/20
Inventor 韩海生田佳孙伟胡岳华王丽杨越孙磊刘若华张荥斐岳彤
Owner CENT SOUTH UNIV