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High-purity anhydrous lithium sulfate preparation method

A lithium sulfate, high-purity technology, applied in the field of lithium compounds, can solve the problems of high raw material price, increase preparation cost, etc., and achieve the effects of low price, high raw material utilization rate, and simple production process.

Active Publication Date: 2014-01-22
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product prepared by this method has high purity and simple process, but the raw material price is high, which increases the preparation cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 50g of crude lithium sulfate crystals, wash them three times with 150ml of acetone each time, and place them in a drying oven at a controlled temperature of 80°C. After 1 hour, take them out and dissolve them in 300ml of deionized water, add 3.3100g of concentrated sulfuric acid (mass fraction 98%), Control the reaction temperature: 40°C; the stirring speed: 220rpm; the reaction time: 60min. After the reaction, the solution was filtered, and 0.14 g of white carbon black and 0.175 g of sodium hydroxide were added to the filtrate, and the reaction temperature was controlled at 60° C.; the stirring speed was 250 rpm; and the reaction time was 60 min. After the reaction is completed, filter, put the filtrate in a rotary evaporator to concentrate in vacuum, control the vacuum degree to -0.085MPa, and the temperature is 65°C, until a large number of crystals appear, then filter, put the product in a drying oven to dry, the drying temperature is 180°C, After 2 hours, the ...

Embodiment 2

[0022] Take 50g of crude lithium sulfate crystals, wash them three times with 150ml of acetone each time, and place them in a drying oven at a controlled temperature of 80°C. After 1 hour, take them out and dissolve them in 300ml of deionized water, add 3.7043g of concentrated sulfuric acid (mass fraction 98%), Control the reaction temperature: 40°C; the stirring speed: 220rpm; the reaction time: 50min. After the reaction, the solution was filtered, 0.2132g of white carbon black and 0.2431g of sodium hydroxide were added to the filtrate, and the reaction temperature was controlled at 50°C; the stirring speed was 250rpm; the reaction time was 60min. After the reaction is completed, filter, put the filtrate in a rotary evaporator to concentrate in vacuum, control the vacuum degree to -0.085MPa, and the temperature is 65°C, until a large number of crystals appear, then filter, put the product in a drying oven to dry, the drying temperature is 180°C, After 2 hours, the product anh...

Embodiment 3

[0024] Take 50g of crude lithium sulfate crystals, wash them three times with 100ml of acetone each time, then place them in a drying oven, control the temperature at 80°C, take them out after 1h and dissolve them in 300ml of deionized water, add 3.2610g of concentrated sulfuric acid (mass fraction 98%), Control the reaction temperature: 30°C; the stirring speed: 220rpm; the reaction time: 60min. After the reaction, the solution was filtered, 0.22g of white carbon black and 0.2867g of sodium hydroxide were added to the filtrate, and the reaction temperature was controlled at 60°C; the stirring speed was 250rpm; the reaction time was 40min. After the reaction is completed, filter, put the filtrate in a rotary evaporator to concentrate in vacuum, control the vacuum degree to -0.085MPa, and the temperature is 65°C, until a large number of crystals appear, then filter, put the product in a drying oven to dry, the drying temperature is 180°C, After 2 hours, the product anhydrous li...

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PUM

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Abstract

The invention discloses a high-purity anhydrous lithium sulfate preparation method. The high-purity anhydrous lithium sulfate preparation method is characterized in that an anhydrous lithium sulfate product is prepared by using a lithium sulfate byproduct obtained in a process of using an iodine containing solution for preparing high-purity lithium iodide trihydrate as a raw material through pretreatment, decarburization, defluorination, concentration, crystallization and drying. The product prepared by the method has good color and luster, and the purity of the product reaches above 99%. Meanwhile, the raw material used in the method is lithium sulfate monohydrate waste generated in a lithium iodide trihydrate preparation process, belongs to the waste reusing and is low in cost and easy to obtain. The high-purity anhydrous lithium sulfate preparation method is an environment-friendly production method which has good economic benefits and low environmental pollution.

Description

technical field [0001] The invention relates to lithium compounds, in particular to the preparation of high-purity anhydrous lithium sulfate. technical background [0002] Anhydrous lithium sulfate is an important inorganic chemical reagent, mainly used in analytical reagents, separation of calcium and magnesium and pharmaceutical industry, and is also commonly used in the manufacture of fireworks. At present, there are two main methods for preparing high-purity anhydrous lithium sulfate at home and abroad: [0003] 1. Direct method: This method uses industrial lithium sulfate crystals for recrystallization and purification. The preparation process of this method is simple, but during the crystallization process, the phosphate, chloride, etc. Crystallized together, it is difficult to prepare high-purity lithium sulfate crystals. [0004] 2. Indirect method: This method uses industrial-grade lithium carbonate as raw material, utilizes the insoluble properties of lithium car...

Claims

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Application Information

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IPC IPC(8): C01D15/06
Inventor 李文飞郭举杨帆解田张丹罗廷武
Owner WENGFU (GRP) CO LTD
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