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Method for purifying lithium sulfate crude ore

A refining method and technology of lithium sulfate, applied in the direction of lithium sulfate/sulfite, borate, alkali metal sulfite/sulfite, etc., can solve the problem of long process route, poor purity and yield of lithium sulfate products Ideal and other issues, to achieve the effect of simple process route, reduced dissolution loss, and simple impurity removal steps

Active Publication Date: 2016-04-20
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

However, due to the long process route and the introduction of new chemical reagents in multiple impurity removal steps, the purity and yield of lithium sulfate products are not ideal

Method used

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  • Method for purifying lithium sulfate crude ore
  • Method for purifying lithium sulfate crude ore

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] The coarse lithium sulfate ore used in the present invention utilizes the applicant's previous patented technology, see Chinese patent 201310124971.2, titled "A Method for Enriching and Separating Beneficial Elements in Sulfate Type Shielding Brine Using Natural Energy". The main steps include: evaporating the original brine of Chabocuo to the saturated state of sodium chloride, freezing nitrate in winter, and then evaporating in spring and summer to precipitate sodium chloride, potassium halite, carnallite, and epsom salt, and to control lithium in the brine. Ion concentration ≥ 6g / L for solid-liquid separation to obta...

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Abstract

The invention provides a method for purifying lithium sulfate crude ore. The method comprises the following steps: step I, mixing the lithium sulfate crude ore S0 with excessive water to ensure that soluble ingredients in the lithium sulfate crude ore are just dissolved completely, and carrying out solid-liquid separation to obtain a solution L0; step II, freezing the solution L0 to separate out mirabilite, and carrying out solid-liquid separation to obtain a solution L1 and a solid S1; step III, evaporating the solution L1 to separate out a solid phase, and carrying out solid-liquid separation to obtain a solution L2 and a solid S2; step IV, allowing the solution L2 to stand still in a sealed condition for 7 to 50 days at 0 to 40 DEG C to separate out borate, and carrying out solid-liquid separation to obtain a solution L3; step V, mixing the solid S1 obtained in the freezing process in the step II with the solution L3, and evaporating the mixture at 0 to 40 DEG C to separate lithium sulfate concentrate.

Description

technical field [0001] The invention relates to a method for preparing lithium sulfate by using sulfate-type brine, in particular to a method for refining lithium sulfate coarse ore. Background technique [0002] There are a large number of salt lakes on the Qinghai-Tibet Plateau in my country. Among them, the salt lakes in the Qaidam area of ​​Qinghai, such as Chaerhan Salt Lake, Dachaidan Salt Lake, East-West Taijinel Salt Lake, Yiliping Salt Lake, Gasikule Salt Lake, etc., after decades of large investment by the state, infrastructure such as roads and railways The conditions such as electricity, water resources, etc. are relatively good, and have been developed or have the conditions for development. Among them, Chaerhan Salt Lake has become the largest salt lake potash fertilizer production base in my country. In the development of these salt lakes, people are unremittingly trying to realize the comprehensive utilization of potassium, lithium, boron, magnesium, sodium a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/06C01D5/00C01F5/30C01D3/08C01B35/12
CPCC01B35/121C01B35/126C01D3/08C01D5/00C01D15/06C01F5/30C01P2006/80
Inventor 高丹丹李东东董亚萍李武边绍菊崔燕峰
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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