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Method for preparing lithium hydroxide monohydrate by extracting lithium from spodumene

A technology of lithium hydroxide monohydrate and lithium hydroxide, which is applied in the direction of lithium oxide; Low production cost, simple and practical process

Active Publication Date: 2012-10-03
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional sulfuric acid method generally prepares lithium sulfate first, then converts it into lithium carbonate by carbonization, and then produces lithium hydroxide monohydrate through a caustic transformation process. The process is long and the production cost is high.
Patent CN101948124A discloses a process for producing lithium hydroxide monohydrate from spodumene. The process uses spodumene acidification leaching and potassium hydroxide transformation to produce lithium hydroxide monohydrate, which overcomes the traditional sulfuric acid method to produce lithium hydroxide monohydrate The disadvantages of long process flow and high production cost, but this process does not propose how to achieve continuous freezing and crystallization of sodium and continuous evaporation and crystallization of lithium hydroxide monohydrate in the industry. If traditional freezing crystallization and evaporation crystallizers are used, continuous production, which limits equipment capacity

Method used

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  • Method for preparing lithium hydroxide monohydrate by extracting lithium from spodumene
  • Method for preparing lithium hydroxide monohydrate by extracting lithium from spodumene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] a. Transformation roasting: Put the spodumene concentrate in the internal heating rotary furnace, and blow the prepared coal powder into the furnace with a blower for high-temperature transformation roasting. The roasting temperature is controlled at 1250°C to convert it from α to beta type;

[0057] B, cooling ball milling: the raw material after the roasting of step a is cooled to normal temperature by heat exchanger, then it is ball milled to 325 mesh, and the spodumene Li after the ball milling is analyzed 2 O content is 5.23%;

[0058] c, acidification roasting: 94% concentrated sulfuric acid and spodumene ground through step b are blended into a slurry, then placed in a rotary kiln for roasting, controlling the excess of sulfuric acid by 40%, and the roasting temperature is controlled at 320°C;

[0059] d. Slurry neutralization: the acidified mixture obtained in step C is subjected to slurry neutralization in a three-stage continuous leaching tank, during which l...

Embodiment 2

[0067] a. Transformation roasting: Put the spodumene concentrate in the internal heating rotary furnace, and blow the prepared coal powder into the furnace with a blower for high-temperature transformation roasting. The roasting temperature is controlled at 1150°C to convert it from α to beta type;

[0068] B, cooling ball milling: the raw material after the roasting of step a is cooled to normal temperature by heat exchanger, then it is ball milled to 150 mesh, and the spodumene Li after the ball milling is analyzed 2 O content is 5.18%;

[0069] c, acidification roasting: 94% concentrated sulfuric acid and spodumene ground through step b are blended into a slurry, then placed in a rotary kiln for roasting, controlling excess sulfuric acid by 10%, and roasting temperature is controlled at 200°C;

[0070] d. Slurry neutralization: The acidified mixture obtained in step C is subjected to slurry neutralization in a three-stage continuous leaching tank, during which limestone is...

Embodiment 3

[0078] a. Transformation roasting: Put the spodumene concentrate in the internal heating rotary furnace, and blow the prepared coal powder into the furnace with a blower for high-temperature transformation roasting. The roasting temperature is controlled at 1200°C to convert from α to beta type;

[0079] B, cooling ball milling: the raw material after the roasting of step a is cooled to normal temperature through a heat exchanger, then it is ball milled to 250 mesh, and the spodumene content after ball milling is analyzed to be 5.21%;

[0080] c, acidification roasting: 94% concentrated sulfuric acid and spodumene ground through step b are blended into slurry, then placed in a rotary kiln for roasting, controlling excess sulfuric acid by 20%, and roasting temperature is controlled at 300°C;

[0081] d. Slurry neutralization: The acidified mixture obtained in step C is subjected to slurry neutralization in a three-stage continuous leaching tank, during which limestone is added ...

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Abstract

The invention discloses a method for preparing lithium hydroxide monohydrate by extracting lithium from spodumene. The method includes steps of transformation roasting, cooling, ball milling, acidification roasting, pulping, neutralizing, separation washing, purifying, blending for transformation, freezing for sodium precipitation, deep decontaminating, evaporative crystallization, centrifugal separation, drip washing and drying. By means of a DTB (draft tube baffle) type crystallizer, an FC (forced circulation) crystallizer or an OSLO crystallizer, continuous cooling crystallization and evaporative crystallization are realized, equipment yield is increased by more than 50%, and equipment utilization rate is increased. Therefore, the method is simple and practical in process, high in equipment yield, low in production cost, high in resource utilization rate, low in energy loss and low in three wastes (waste gas, waste water and waste residues).

Description

technical field [0001] The invention relates to a method for preparing lithium hydroxide monohydrate, in particular to a method for extracting lithium from spodumene to prepare lithium hydroxide monohydrate. Background technique [0002] Industrial lithium metal smelting methods are mainly divided into two categories: one is to enrich the lithium in the brine through comprehensive extraction and utilization of other valuable metal minerals in the brine containing lithium, and finally obtain monohydrate Lithium salt products such as lithium hydroxide, lithium carbonate, lithium sulfate, etc. However, because most of the domestic salt lake brine has the characteristics of low magnesium-lithium ratio, it is difficult to develop, and it is difficult to implement the industrialization of lithium extraction from brine; The main lithium-containing ores-spodumene and lepidolite are treated by pyrolysis or wet treatment, destroying their original gangue structure, so that the Li 2 O...

Claims

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Application Information

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IPC IPC(8): C01D15/02
Inventor 李良彬袁中强彭爱平罗光华胡萍刘明
Owner GANFENG LITHIUM CO LTD
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