Method for leaching nickel and molybdenum from amorphous nickel-molybdenum sulfide mineral by oxidative conversion

A nickel-molybdenum sulfide and amorphous technology, which is applied in the field of metallurgy and chemical industry, can solve the problem of not making full use of the specific surface area of ​​amorphous nickel-molybdenum sulfide ore, and achieve high metal leaching rate, large specific surface area and short process flow. Effect

Inactive Publication Date: 2014-08-06
KUNMING UNIV OF SCI & TECH TECH IND SALES MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common problem is that the mineralogical characteristics of amorphous nickel-molybdenum sulfide ore with large specific surface area, high activity, and easy oxidation to sulfuric acid and sulfate are not fully utilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: The mass percentages of the main chemical components of amorphous nickel-molybdenum sulfide ore are Ni 11.5%, Mo 2.0%, and S 30.5%, and the corresponding minerals are crushed and finely ground to a particle size of less than 0.1mm, accounting for 80%. Take 5kg of finely ground ore samples, mix them with 7.5L of water to make slurry (liquid-solid ratio is 1.5:1), and use an acid-resistant pump to pump the ore slurry into the autoclave. Introduce industrial oxygen into the kettle to keep the pressure in the kettle at 0.8MPa; turn on the heating system to heat up the pulp in the kettle, control the temperature to 110°C, react for 360min, and the acidity of the solution at the end of the reaction is 60g / L; discharge the pulp, filter, A leaching solution and leaching residue containing nickel sulfate and molybdenum sulfate are obtained. The leached slag was dried to obtain 1.95 kg of dry slag, corresponding to the chemical composition of the slag being Ni 1.27%, M...

Embodiment 2

[0019] Example 2: The mass percentages of the main chemical components of amorphous nickel-molybdenum sulfide ore are Ni 6.2%, Mo 5.1%, and S 21.8%, and the corresponding minerals are crushed and finely ground to a particle size of less than 0.1mm, accounting for 80%. Take 3.5kg of finely ground ore samples, mix them with 7.0L of water (liquid-solid ratio is 2:1), and pump the ore slurry into the autoclave with an acid-resistant pump. Introduce industrial oxygen into the kettle to keep the pressure inside the kettle at 1.2MPa; turn on the heating system to raise the temperature of the pulp in the kettle, control the temperature to 125°C, react for 300 minutes, and the acidity of the solution after the reaction is 30g / L; discharge the pulp, filter, A leaching solution and leaching residue containing nickel sulfate and molybdenum sulfate are obtained. The leached slag was dried to obtain 2.21 kg of dry slag, corresponding to the mass percentages of the chemical components of the...

Embodiment 3

[0021] Example 3: The mass percentages of the main chemical components of the amorphous nickel-molybdenum sulfide ore are Ni 3.0%, Mo 9.8%, and S 8.0%, and the corresponding minerals are crushed and finely ground until the particle size is less than 0.1 mm, accounting for 80%. Take 1.5kg of finely ground ore sample, mix it with 7.5L of water to adjust slurry (liquid-solid ratio is 5:1), and use an acid-resistant pump to pump the slurry into the autoclave. Introduce industrial oxygen into the kettle to keep the pressure in the kettle at 2.0MPa; turn on the heating system to heat up the pulp in the kettle, control the temperature to 200°C, and react for 180 minutes to finish the reaction. The acidity of the solution is 5g / L; discharge the pulp and filter to obtain Leaching solution and leaching residue containing nickel sulfate and molybdenum sulfate. The leached slag was dried to obtain 0.92 kg of dry slag, corresponding to the mass percentages of the chemical components of the...

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Abstract

The invention belongs to the field of metallurgical chemical industry, and particularly relates to a method for leaching nickel and molybdenum from an amorphous nickel-molybdenum sulfide mineral by oxidative conversion. According to the technical scheme, the method comprises the following steps: mixing the amorphous nickel-molybdenum sulfide mineral which is finely ground with water to prepare pulp; adding the pulp into a pressure kettle, introducing industrial oxygen, and performing temperature rising reaction under the pressure of 0.8-2.0 MPa and at the temperature of 110-200 DEG C; converting the nickel and the molybdenum into sulfates, dissolving the sulfates into a solution, and filtering the pulp to obtain a leachate containing nickel sulfate and molybdenum sulfate acyl. The characteristics of large specific surface area and high activity of the amorphous nickel-molybdenum sulfide mineral are fully utilized; under the condition that acid is not added, colloidal sulfide is directly converted into sulfuric acid and sulfate in an oxidative manner, so that the nickel and the molybdenum can be leached, the process flow is short, conventional roasting is not needed, harmful smoke pollution is avoided, the process is clean, the consumption of reagents is low, and the leaching rate of metal is high.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, and in particular relates to a method for leaching nickel and molybdenum through oxidation transformation of amorphous nickel-molybdenum sulfide ore. Background technique [0002] Amorphous nickel-molybdenum sulfide ore is a polymetallic complex mineral resource. The main metals are present in amorphous colloidal sulfide with extremely fine particle size, and most of the carbon is amorphous and filled in quartz and silk. Between mica and kaolin particles or in cracks, it is difficult to separate and enrich useful minerals by mineral processing technology. The existing technology for processing amorphous nickel-molybdenum sulfide ore is mainly based on the fire treatment process of molybdenite. The main technical methods are: oxidation roasting, calcification roasting, concentrated sulfuric acid curing roasting, etc. The basic process of these processes is to oxidize and desulfuri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B23/00C22B34/34
CPCY02P10/20
Inventor 魏昶李兴彬邓志敢李旻廷李存兄樊刚
Owner KUNMING UNIV OF SCI & TECH TECH IND SALES MANAGEMENT
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