Preparation technology of lithium carbonate

A preparation process, lithium carbonate technology, applied in the field of lithium extraction from brine, can solve the problems of pollution, complex process, high cost, etc., and achieve high economic benefits, high quality, and less impurities

Active Publication Date: 2017-05-31
ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation process of lithium carbonate, which is used to solve the problems of high cost, complex process and serious pollution in the existing ore lithium extraction method

Method used

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  • Preparation technology of lithium carbonate

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preparation example Construction

[0032] The present embodiment provides a kind of preparation technology of lithium carbonate, comprises the steps:

[0033] Step S1 impurity removal and concentration process:

[0034] Step a1: First, the salt lake brine is sent into an adsorption-desorption device equipped with a lithium adsorbent, so that the salt lake brine undergoes successive adsorption, leaching and desorption operations to obtain a lithium desorption solution. The lithium ion concentration in the lithium desorption solution is 0.4-0.6g / L, the magnesium ion concentration is 0.5-1.5g / L, the sodium ion concentration is 0.3-0.5g / L, and the chloride ion concentration is 2.5-4.0g / L .

[0035] The above-mentioned adsorption, rinsing, and desorption operations on salt lake brine are well known to those skilled in the art, so they will not be described in detail here. The lithium adsorbents used in this example include but are not limited to manganese-based adsorbents, aluminum-based adsorbents Adsorbents, tit...

Embodiment 1

[0067] Step S1 impurity removal and concentration process:

[0068] Step a1: sending the salt lake brine into an adsorption-desorption device equipped with a lithium adsorbent, so that the salt lake brine undergoes successive adsorption, leaching and desorption operations to obtain a lithium desorption solution. The lithium ion concentration in the lithium desorption solution was 0.4 g / L, the magnesium ion concentration was 0.5 g / L, the sodium ion concentration was 0.3 g / L, and the chloride ion concentration was 2.5 g / L.

[0069] Step b1: passing the above lithium desorption solution through the calcium and magnesium adsorption resin, thereby removing magnesium ions in the lithium desorption solution, so that the magnesium ion concentration of the lithium desorption solution is 0.018 mg / L, and obtaining the impurity removal solution.

[0070] Step c1: using the reverse osmosis concentration method to concentrate the impurity-removing liquid to obtain a section of lithium conce...

Embodiment 2

[0083] Each step in the present embodiment is identical with embodiment one, just in the present embodiment, what sodium carbonate material adopts is not the by-product sodium carbonate decahydrate crystal in the urea method to produce biurea process, but soda ash solution, therefore omits For the treatment steps a2-b2 of the by-product sodium carbonate decahydrate, the soda ash solution and the lithium-containing concentrated solution are directly mixed and reacted.

[0084] In the produced lithium carbonate product of the present embodiment, the massfraction of lithium carbonate is 99.09%, and impurity content is as follows: Na 2 The mass fraction of O is 0.1174%, Fe 2 o 3 The mass fraction of CaO is 0, the mass fraction of CaO is 0.0332, and the mass fraction of SO 4 2- The mass fraction of Cl is 0.0245, Cl - The mass fraction of 0.1313%, H 2 The mass fraction of O is 0.063%, the mass fraction of hydrochloric acid insoluble matter is 0.040%, and the mass fraction of Mg...

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Abstract

The invention discloses a preparation technology of lithium carbonate. The preparation technology comprises the following steps: S1, a process of impurity removal and concentration: carrying out impurity removal and concentration on salt lake brine to obtain lithium-containing concentrated liquor; S2, a process of carbonization lithium-settling: adding sodium carbonate decahydrate crystals which is a by-product produced in a process of preparing biurea by means of urea treatment into the lithium-containing concentrated liquor obtained in the S1 so as to form reaction liquid, wherein the molar ratio of sodium carbonate to lithium in the reaction liquid is equal to (1.2-1.6): 2 in an initial state, and carrying out a reaction to generate lithium carbonate precipitate; S3, a process of aftertreatment: separating out the lithium carbonate precipitate generated in the step S2, washing, and drying to obtain the lithium carbonate product. The preparation method utilizes the sodium carbonate decahydrate crystals which is the by-product produced in a process of preparing the biurea by means of urea treatment, thus realizing the effects of recycling the material and reducing the long-distance transport cost of the material; furthermore, the preparation method also lowers the preparation cost of the lithium carbonate, thus having higher economic benefit. After the preparation technology is adopted, the high-quality lithium carbonate product also can be obtained and is beneficial to later use.

Description

technical field [0001] The invention relates to the technical field of extracting lithium from brine, in particular to a preparation process for lithium carbonate. Background technique [0002] Lithium is the lightest metal in nature, with unique physical and chemical properties such as high specific heat, high electrical conductivity and strong chemical activity, and has a wide range of uses. At present, the application of lithium metal and its compounds in glass ceramics, electrolytic aluminum, grease, air-conditioning refrigeration and organic synthesis, metallurgy, medicine, chemical industry, reagents and other traditional industrial fields continues to grow. In aluminum-lithium alloys, lithium batteries and nuclear fusion, etc. The application in civil industry, high technology and military industry has also been rapidly expanded. Because of its application in lithium batteries, lithium metal is also known as "the upstart of energy in the 21st century". [0003] At p...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 刘利德张能宁鹏于雪峰许振琪俞莅军代军礼雷荣祥孙学敏张元金蒲治文
Owner ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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