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Method for leaching nickel and cobalt form low-iron and high-magnesium and high-iron and low-magnesium laterite-nickel ore by using waste dilute sulphuric acid

A technology of laterite nickel ore and dilute sulfuric acid is applied in the field of high iron and low magnesium laterite nickel ore leaching nickel and cobalt with waste dilute sulfuric acid, low iron and high magnesium, and can solve the problems of increased investment risk, secondary pollution, high cost, etc. Reasonable technological advancement, safe operation, and reduced raw material costs

Inactive Publication Date: 2013-01-16
杭州蓝普水务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, a large amount of dilute sulfuric acid will be by-produced in chemical production such as dyes, pigments, pesticides, titanium dioxide, etc. However, manufacturers in these industries have not yet used or developed this technology
At present, there are four commonly used methods for the treatment of waste dilute sulfuric acid: (1) Neutralization with limestone: the cost is high, a large amount of gypsum mud is produced by-product, and secondary pollution is formed, which is suitable for a small amount of low-acid treatment
(2) Multi-effect evaporation and high-temperature concentration method: large investment and high energy consumption
⑷. The by-product alkaline water absorption sodium sulfate method and the organic product project raw material method, etc., need to start new suitable projects, and the investment risk increases

Method used

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  • Method for leaching nickel and cobalt form low-iron and high-magnesium and high-iron and low-magnesium laterite-nickel ore by using waste dilute sulphuric acid
  • Method for leaching nickel and cobalt form low-iron and high-magnesium and high-iron and low-magnesium laterite-nickel ore by using waste dilute sulphuric acid
  • Method for leaching nickel and cobalt form low-iron and high-magnesium and high-iron and low-magnesium laterite-nickel ore by using waste dilute sulphuric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The test ore sample is low-iron and high-magnesium laterite nickel ore, containing 2.26% nickel, 0.09% cobalt, 13.8% iron, and 26.5% magnesium oxide. The grinding particle size -0.075mm accounts for 90%, the pulp concentration is 42%, and the mass concentration is 23.5%. The mass ratio of dilute sulfuric acid to dry ore is 0.85:1, the liquid-solid ratio is 2.5:1, leaching for one hour, introducing air to pressurize the pressure in the kettle to 0.25MPa, continuing leaching for half an hour, adding 30% of the original ore content of high magnesium ore, continue leaching for 2.5 hours, add magnesite to neutralize to pH 5.7, leach ore slurry liquid-solid separation, leaching liquid magnesite to precipitate nickel. Results: The recovery rate of nickel was 97.6%, and the recovery rate of cobalt was 95.3%.

Embodiment 2

[0047] The test ore sample is a mixed ore sample. The upper layer of high-iron and low-magnesium laterite nickel ore contains 1.51% nickel, 0.10% cobalt, 25.3% iron, and 13.8% magnesium oxide, and the lower layer contains 1.8% nickel and 0.02% cobalt. Iron 15.4%, magnesium oxide 27.2%. The high-iron and low-magnesium laterite nickel ore is ground to a particle size of -0.075mm, accounting for 90%, and the pulp concentration is 45%. The low-iron, high-magnesium laterite nickel ore is ground to a particle size of -0.075mm, accounting for 85%, and the pulp concentration is 55%. According to the conditions of dilute sulfuric acid with a mass concentration of 25% and high iron and low magnesium laterite nickel ore at a mass ratio of 0.75:1 and a liquid-solid ratio of 2.5:1, leaching for one hour, adding low iron high Magnesium laterite nickel ore, add sulfuric acid with a mass concentration of 25% equivalent to 40% of low-iron high-magnesium laterite nickel ore at the same time, fe...

Embodiment 3

[0049] The test ore sample is a mixed ore sample. The upper layer of high-iron and low-magnesium laterite nickel ore contains 1.80% nickel, 0.20% cobalt, 36.23% iron, and 6.21% magnesium oxide. The lower layer contains 2.33% nickel and 0.05% cobalt. Iron 13.56%, magnesium oxide 21.37%. The high-iron and low-magnesium laterite nickel ore is ground to a particle size of -0.075mm, accounting for 85%, and the pulp concentration is 45%. The low-iron, high-magnesium laterite nickel ore is ground to a particle size of -0.075mm, accounting for 90%, and the pulp concentration is 55%. According to the conditions of dilute sulfuric acid with a mass concentration of 28% and the mass ratio of high-iron and low-magnesium laterite nickel ore of 0.9:1 and liquid-solid ratio of 2.5:1, leaching for one hour, adding low-iron and high-magnesium ore equivalent to 45% of high-iron and low-magnesium laterite nickel ore Laterite nickel ore, at the same time, add sulfuric acid with a mass concentratio...

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Abstract

The invention provides a method for leaching nickel and cobalt from low-iron and high-magnesium and high-iron and low-magnesium laterite-nickel ore by using waste dilute sulphuric acid. Nickelous hydroxide, cobaltous hydroxide and the like are directly extracted by leaching the laterite-nickel ore with non-concentrated decolored and desalinated waste dilute sulphuric acid. The method specially comprises the steps of: removing impurities out of the waste dilute sulphuric acid, slurrying, leaching and pre-neutralizing, filtering and washing leached ore pulp, settling nickel and cobalt from leachate, filtering and washing nickel and cobalt settled slurry, electrically depositing nickel, and post-treating and recycling iron, magnesium, manganese and the like. The method provided by the invention overcomes the technical difficulty, ensures that a technology of a direct dilute sulphuric acid atmospheric pressure leaching process route operates stably, is greatly lowered in cost, is high in production efficiency, and is high in recycling rate of nickel, cobalt, iron, magnesium, manganese and other metals. The waste dilute sulphuric acid which is an byproduct in industries such as dye industry and is difficult to treat is effectively recycled, the method is environmental-friendly, any harmful gas is not emitted, waste slag is solid materials, trees can be planted on the waste slag for greening, the waste slag can be recycled, and waste water can completely reach the standard for emission.

Description

technical field [0001] The invention belongs to the technical field of comprehensive application of nonferrous metal hydrometallurgy and pyrometallurgy, and in particular relates to a method for leaching nickel and cobalt with waste dilute sulfuric acid from a low-iron, high-magnesium, high-iron, low-magnesium laterite nickel ore. Background technique [0002] The existing processing technologies of laterite nickel ore in the world are divided into three categories: fire method, wet method and fire-wet combination method. The first type of pyrotechnic process: the ore is crushed by ore dressing, dried in a rotary kiln, then roasted, electric / blast furnace / electric carbon reduction smelting or vulcanization smelting to produce crude ferronickel or low-nickel-sulfur semi-finished products, and then refined to obtain products. There are many kinds of the second type of wet method. The main typical process is as follows: ore is leached with sulfuric acid, hydrochloric acid or ni...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/22C22B3/44C22B23/00
Inventor 不公告发明人
Owner 杭州蓝普水务有限公司
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