Method for synthesizing strontium carbonate from celestite by high-temperature static reduction-pressurization conversion

A technology of celestite and strontium carbonate, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem that the reaction speed cannot be effectively improved, achieve the significance of strong industrial promotion, increase the carbonization reaction rate, and avoid the effect of hydrogen sulfide pollution

Inactive Publication Date: 2014-12-10
深圳市捷鑫资产管理有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

However, since celestite is relatively stable and controlled by diffusion, the reaction rate of celestite directly converted into crude strontium carbonate cannot be effectively improved

Method used

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  • Method for synthesizing strontium carbonate from celestite by high-temperature static reduction-pressurization conversion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1kg of celestite concentrate and 0.1kg of carbon are fully mixed, pressed into pellets with a particle size of 50mm, and placed in a rotary hearth furnace for reduction roasting at 1200°C for 30min. When the calcined material is cooled to 500°C, it is crushed by a roller crusher until the percentage of the particle size is less than 100 mesh to 50%, and then transferred to the prepared conversion liquid in the autoclave (wherein the concentration of ammonium carbonate is 4mol / L, the concentration of ammonia water is 16mol / L, the concentration of ammonium chloride is 1mol / L, lignosulfonate 0.4%), immediately seal the dosing, the stirring speed is 800rpm, the liquid-solid ratio is 5:1, and the temperature of the autoclave is stable Reaction at 95°C for 2h. After the reaction is completed, the slurry is separated from the liquid to the solid, and the filter residue is crude strontium carbonate. The industrial strontium carbonate product with a purity of 98% can be obtain...

Embodiment 2

[0034] 1kg of celestite concentrate and 0.3kg of carbon are fully mixed, pressed into pellets with a particle size of 10mm, and placed in a rotary hearth furnace for reduction roasting at 1400°C for 10min. When the calcined material is cooled to 300°C, it is crushed by a roller crusher until the particle size is less than 100 mesh, and the percentage of the part is up to 75%, and then transferred to the prepared conversion liquid in the autoclave (wherein the concentration of ammonium carbonate is 2mol / L, the concentration of ammonia water is 8mol / L, the concentration of ammonium chloride is 0.3mol / L, and the concentration of lignosulfonate is 0.2%), immediately seal the dosing, the stirring speed is 600rpm, the liquid-solid ratio is 3:1, and wait for high pressure React for 4 hours when the kettle temperature stabilizes to 50°C. After the reaction is completed, the slurry is separated from the liquid to the solid, and the filter residue is crude strontium carbonate. The cru...

Embodiment 3

[0036] 1kg of celestite concentrate and 0.5kg of carbon are fully mixed, pressed into pellets with a particle size of 1mm, and placed in a rotary hearth furnace for reduction roasting at 1500°C for 20min. When the calcined material is cooled to 200°C, it is crushed by a roller crusher until the percentage of the particle size is less than 100 mesh to 80%, and then transferred to the prepared conversion liquid in the autoclave (wherein the concentration of ammonium carbonate is 1mol / L, the concentration of ammonia water is 4mol / L, the concentration of ammonium chloride is 0.1mol / L, and the concentration of lignosulfonate is 0.1%), immediately seal the dosing, the stirring speed is 200rpm, the liquid-solid ratio is 2:1, and wait for high pressure React for 1 hour when the kettle temperature stabilizes to 150°C. After the reaction is completed, the slurry is separated from the liquid to the solid, and the filter residue is crude strontium carbonate. The industrial strontium car...

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Abstract

The invention discloses a method for synthesizing strontium carbonate from celestite by high-temperature static reduction-pressurization conversion. The method comprises the following steps: 1) preparing celestite concentrate and carbon into carbonous pellets, and carrying out reduction roasting in a rotary hearth furnace; 2) when the roasted product is cooled to 200-500 DEG C in a reducing atmosphere, crushing; 3) immediately introducing the crushing product into a high-pressure autoclave containing a conversion solution, immediately sealing to prepare the solution, and starting the conversion reaction when the temperature of the high-pressure autoclave reaches 50-150 DEG C; 4) carrying out solid-liquid separation on the converted ore slurry, sufficiently washing the filtration residue to obtain crude strontium carbonate, and sending the filtrate into an ammonia recovery system to perform ammonia steaming recovery so as to regenerate ammonium carbonate; and 5) carrying out impurity purification on the crude strontium carbonate to obtain high-purity strontium carbonate, sufficiently washing, drying, bagging, sealing and storing. The method solves the problem of hydrogen sulfide pollution, and enhances the reaction rate.

Description

technical field [0001] The invention belongs to the technical field of clean production of strontium carbonate, in particular to a method for synthesizing strontium carbonate by high-temperature static reduction-pressurized conversion of celestite ore. Background technique [0002] Strontium carbonate is a basic raw material for the production of strontium salt, and it also has great application value. With the development of technology, people put forward higher requirements for the output and quality of strontium products. [0003] At present, domestic methods for co-using strontium carbonate mainly include carbon reduction method and double decomposition method. Enterprises generally use the carbon reduction method to produce strontium carbonate, that is, use celestite concentrate and coal powder as raw materials, and obtain black ash (SrS) after high-temperature reduction and roasting. Oh) 2 ) by adding carbonate or CO 2 The reaction proceeds to form crude strontium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 段东平郑斯雷陈思明周娥韩宏亮
Owner 深圳市捷鑫资产管理有限公司
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