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Method for extracting selenium from nickel-molybdenum ore smelting smoke dust in alkali system

A technology for nickel-molybdenum ore and soot is applied in the field of hydrometallurgical extraction of selenium, which can solve the problems of easy leakage of toxic gas, low selenium recovery rate, low production cost, etc., and achieve the effects of easy floating, improved recovery rate, and reduced emission.

Active Publication Date: 2012-10-24
CHANGSHA RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to eliminate the toxicity of As and Se in nickel-molybdenum ore smelting dust to the environment, recover the valuable element selenium in the dust, realize the comprehensive utilization of resources, and overcome the low selenium recovery rate, high energy consumption and toxic gas existing in the traditional selenium extraction process Easy to leak, dust flying, pollute the environment and other defects, the present invention proposes a short process, simple operation, low energy consumption, high metal recovery rate, low production cost, and can achieve low-carbon environmental protection and other metallurgical purposes in alkaline Method for extracting selenium in nickel-molybdenum ore smelting flue dust in the system

Method used

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  • Method for extracting selenium from nickel-molybdenum ore smelting smoke dust in alkali system

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Experimental program
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Effect test

Embodiment 1

[0029] such as figure 1 The shown method for extracting selenium in nickel-molybdenum ore smelting smoke in an alkaline system comprises the following steps:

[0030] (1) Pretreatment of nickel-molybdenum ore smelting fume: First, the raw materials are crushed, ball-milled and screened to obtain -100 mesh nickel-molybdenum ore smelting fume (particle size less than 0.15mm in the range of 100-300 mesh).

[0031] (2) Oxidative leaching of selenium in an alkaline system: in an alkaline system, the nickel-molybdenum ore smelting dust obtained after the pretreatment in step (1) is subjected to oxidative leaching, and the oxidative leaching is carried out in a leaching system of an aqueous sodium hydroxide solution , the oxidant is sodium hypochlorite. The specific operation steps of oxidative leaching are as follows: first, prepare 100ml with a concentration of 2.0mol·L -120 g of nickel-molybdenum ore smelting dust obtained after the pretreatment in step (1) was added to the reac...

Embodiment 2

[0034] such as figure 1 The shown method for extracting selenium in nickel-molybdenum ore smelting smoke in an alkaline system comprises the following steps:

[0035] (1) Pretreatment of nickel-molybdenum ore smelting fume: First, the raw materials are crushed, ball-milled and screened to obtain -150 mesh nickel-molybdenum ore smelting fume (the particle size is less than 0.15mm in the range of 100-300 mesh).

[0036] (2) Oxidative leaching of selenium in an alkaline system: in an alkaline system, the nickel-molybdenum ore smelting dust obtained after the pretreatment in step (1) is subjected to oxidative leaching, and the oxidative leaching is carried out in a leaching system of an aqueous sodium hydroxide solution , the oxidant is sodium hypochlorite. The specific operation steps of oxidative leaching are as follows: first, prepare 120ml with a concentration of 2.5mol·L -1 20 g of nickel-molybdenum ore smelting dust obtained after the pretreatment in step (1) was added to ...

Embodiment 3

[0039] such as figure 1 The shown method for extracting selenium in nickel-molybdenum ore smelting smoke in an alkaline system comprises the following steps:

[0040] (1) Pretreatment of nickel-molybdenum ore smelting fume: First, the raw materials are crushed, ball-milled and screened to obtain -150 mesh nickel-molybdenum ore smelting fume (the particle size is less than 0.15mm in the range of 100-300 mesh).

[0041] (2) Oxidative leaching of selenium in an alkaline system: in an alkaline system, the nickel-molybdenum ore smelting dust obtained after the pretreatment in step (1) is subjected to oxidative leaching, and the oxidative leaching is carried out in a leaching system of an aqueous sodium hydroxide solution , the oxidant is sodium hypochlorite. The specific operation steps of oxidative leaching are as follows: First, prepare 80ml with a concentration of 3.0mol·L -1 20 g of nickel-molybdenum ore smelting dust obtained after the pretreatment in step (1) was added to t...

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Abstract

The invention discloses a method for extracting selenium from nickel-molybdenum ore smelting smoke dust in an alkali system. The method comprises the following steps of: pre-treating the nickel-molybdenum ore smelting smoke dust; performing oxidation leaching on the pre-treated nickel-molybdenum ore smelting smoke dust in an alkali leaching system; and performing selenium reduction reaction on oxidation-leached seleninic acid radical-containing leachate by taking at least one of formaldehyde and diammonium under an alkali condition to highly separate seleninic acid radical ions from other ions in the leachate to obtain high-purity selenium powder. The method is short in process flow, easy to operate, low in energy consumption, high in metal recovery rate and low in production cost, and a low-carbon and environment-friendly smelting aim can be fulfilled.

Description

technical field [0001] The invention relates to a selenium hydrometallurgical extraction method, in particular to a full hydrometallurgical method for extracting selenium from nickel-molybdenum ore smelting dust in an alkaline system. Background technique [0002] Nickel-molybdenum ore is a multi-metal composite ore rich in nickel and molybdenum, which is widely distributed in Guizhou, Hunan, Yunnan and Zhejiang in my country. According to estimates by Peking University, my country's proven nickel-molybdenum ore industrial reserves contain 52.2 million tons of molybdenum, 45.15 million tons of nickel, 510 tons of gold, 10,800 tons of silver, 480 tons of palladium, and 501 tons of rare metals. Due to the huge reserves of nickel-molybdenum ore and the high content of valuable metals nickel and molybdenum (Ni: 0.7% to 7.7%, Mo: 2% to 11%), it has attracted great attention from metallurgists at home and abroad. Therefore, it is of great significance to develop and utilize nicke...

Claims

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Application Information

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IPC IPC(8): C01B19/02
Inventor 侯晓川
Owner CHANGSHA RES INST OF MINING & METALLURGY
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