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Method for separating sodium and magnesium from laterite-nickel ore smelting primary wastewater

A technology of laterite nickel ore and laterite ore, which is applied in chemical instruments and methods, magnesium sulfate, alkali metal sulfite/sulfite, etc., can solve the problems of waste water utilization, etc., and achieve easy industrialization, increased economy, and easy operation Effect

Inactive Publication Date: 2015-03-18
BEIJING ENCRYO ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the invention is to overcome the deficiencies in the prior art, in order to solve the waste water utilization problem that produces in the laterite nickel ore wet smelting process, thereby provide a kind of magnesium sulfate-sodium sulfate type primary waste water that produces with laterite nickel ore wet smelting as The method for preparing magnesium sulfate heptahydrate and sodium sulfate decahydrate by separating sodium and magnesium from raw materials through cooling and crystallization

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  • Method for separating sodium and magnesium from laterite-nickel ore smelting primary wastewater
  • Method for separating sodium and magnesium from laterite-nickel ore smelting primary wastewater

Examples

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Embodiment 1

[0021] For the specific process flow of this embodiment, please refer to figure 1 .

[0022] For a better description of this embodiment, figure 2 The process schematic diagram of this embodiment is given in . The raw waste water used in this example is the primary waste water produced in the hydrometallurgical smelting process of laterite nickel ore. The solution does not contain other cations except sodium and magnesium ions. The concentration of magnesium ions in the solution is 0.6mol / L, and the sodium ions are 0.15mol / L. Put 1000mL of primary waste water into the evaporator, and evaporate the solution in the boiling state until the concentration of magnesium ions reaches 3.5mol / L to obtain the mother liquor I. At this time, the corresponding solution composition point is figure 2 Middle h point; mother liquor I is transferred to the magnesium sulfate heptahydrate crystallization kettle, and it is cooled to 15 ℃, at this moment, the magnesium sulfate heptahydrate crys...

Embodiment 2

[0024] For the specific process flow of this embodiment, please refer to figure 1 .

[0025] The raw waste water used in this example is the primary waste water produced in the hydrometallurgical smelting process of laterite nickel ore. The solution does not contain other cations except sodium and magnesium ions. The concentration of magnesium ions in the solution is 2mol / L, and the concentration of sodium ions is 0.6 mol / L. Put 500mL of primary waste water into the evaporator, and evaporate the solution until the concentration of magnesium ions reaches 3mol / L in a boiling state; Add magnesium sulfate heptahydrate seed crystals to the magnesium sulfate heptahydrate crystallization kettle in an amount of 3 g / L, and continue to crystallize for 20 minutes while stirring to obtain slurry I; after filtering slurry I, the solid is dried to obtain heptahydrate with a purity of 95%. Magnesium sulfate 98g, the filtered mother liquor is the secondary waste water; add 10mL of primary w...

Embodiment 3

[0027] For the specific process flow of this embodiment, please refer to figure 1 .

[0028] The raw waste water used in this example is the primary waste water produced during the laterite nickel ore hydrometallurgical smelting process. The solution does not contain other cations except sodium and magnesium ions. The concentration of magnesium ions in the solution is 1mol / L, and the concentration of sodium ions is 0.3 mol / L. Put 1000mL of primary waste water into the evaporator, and evaporate the solution until the concentration of magnesium ions reaches 3mol / L under boiling state; Add magnesium sulfate heptahydrate seed crystals to the magnesium sulfate heptahydrate crystallization kettle in an amount of 2 g / L, and continue to crystallize for 90 minutes while stirring to obtain slurry I; after filtering slurry I, the solid is dried to obtain heptahydrate with a purity of 90%. Magnesium sulfate 100g, the filtered mother liquor is the secondary waste water; add 30mL of prima...

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Abstract

The invention relates to a method for separating sodium and magnesium from laterite-nickel ore smelting primary wastewater, which comprises the following steps: concentrating magnesium sulfate-sodium sulfate primary wastewater generated by laterite-nickel ore smelting by evaporation until the magnesium ion concentration reaches 3-3.5 mol / L, cooling the solution in a magnesium sulfate heptahydrate crystallizer to 12-20 DEG C to crystallize, and filtering to obtain magnesium sulfate heptahydrate solid, wherein the mother solution after filtration is secondary wastewater; adding the primary wastewater blending material into the mother solution until the magnesium ion concentration in the solution is lowered to 1.5-2 mol / L; cooling the solution in a sodium sulfate decahydrate crystallizer to -5-5 DEG C to crystallize, and filtering to obtain sodium sulfate decahydrate solid; and returning the decahydrate sodium sulfate separation mother solution to the primary wastewater for the next circulation. The method provided by the invention has the advantages of simple technique and favorable economical efficiency, and separates salable chemical products from the nickel smelting wastewater; and meanwhile, due to the adoption of the mother solution circulation mode, the technical process does not discharge any waste liquor, and thus, is environment-friendly.

Description

technical field [0001] The invention relates to the fields of hydrometallurgical wastewater treatment and inorganic salt crystallization, in particular to a method for separating sodium and magnesium from magnesium sulfate-sodium sulfate primary wastewater produced by laterite nickel ore smelting. Background technique [0002] High-pressure acid leaching is an important process in the nickel extraction process of laterite nickel ore hydrometallurgy in my country. It has the characteristics of low energy consumption and high recovery rate, and is mostly used to treat limonite-type laterite ore with low magnesium content. The method is generally to use limonite-type laterite ore, and then use magnesia ore slurry to neutralize the excess acid in the leaching solution. During the acid leaching process of nickel, most of the magnesium in the ore will dissolve into the solution together with the nickel, and in the subsequent process of alkali neutralization and precipitation to se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40C01D5/00
Inventor 王道广王英军
Owner BEIJING ENCRYO ENG
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