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Method for preparing strontium hydroxide through celestite alkali fusion roasting

A technology of strontium hydroxide and celestite, which is applied in the direction of calcium/strontium/barium oxide/hydroxide, the improvement of process efficiency, etc., can solve the problems of high calcination temperature, cumbersome preparation method, large energy consumption, etc. The effect of shortening the process, reducing the diffusion resistance, and simple equipment

Pending Publication Date: 2022-08-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN101704540A discloses a collinear preparation method of strontium hydroxide and strontium carbonate. The preparation method comprises the following steps: hot leaching SrS clinker at 75-95°C; sealing the leached solution, stirring, cooling and separating After getting Sr(OH) 2 ·8H 2 O solid; the above solid is dissolved in water and hydrogen peroxide is added, after heating and filtering, Sr(OH) is precipitated 2 ·8H 2 O crystals, the filtered solution was carbonized to obtain SrCO 3 , the preparation method is cumbersome, and the crystallization mother liquor still needs to be carbonized to produce SrCO 3
The calcination temperature of the method is too high, and the energy consumption is large

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  • Method for preparing strontium hydroxide through celestite alkali fusion roasting

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Embodiment 1

[0036] The present embodiment provides a method for preparing strontium hydroxide by alkali fusion roasting of celestite, the method comprising the following steps:

[0037] (1) mix 65wt% celestite, 33wt% sodium hydroxide and 2wt% starch according to mass ratio to make pellets;

[0038] (2) calcining the pellets in step (1) at 400° C. for 120 min under air, and then performing leaching, filtration and recrystallization in sequence to obtain strontium hydroxide, and the flow rate of the air is 15 mL / min.

Embodiment 2

[0040] The present embodiment provides a method for preparing strontium hydroxide by alkali fusion roasting of celestite, the method comprising the following steps:

[0041] (1) mix 54wt% celestite, 41wt% potassium hydroxide and 5wt% cellulose according to mass ratio to make pellets;

[0042] (2) calcining the pellets described in step (1) at 300° C. for 60 min under nitrogen, and then sequentially performing leaching, filtration and recrystallization to obtain strontium hydroxide, and the flow rate of the nitrogen is 50 mL / min.

Embodiment 3

[0044] The present embodiment provides a method for preparing strontium hydroxide by alkali fusion roasting of celestite, the method comprising the following steps:

[0045] (1) mix 33wt% lapis lazuli, 64wt% lithium hydroxide and 3wt% water glass according to mass ratio to make pellets;

[0046] (2) calcining the pellets described in step (1) at 500° C. for 60 min under nitrogen, and then sequentially performing leaching, filtration and recrystallization to obtain strontium hydroxide, and the flow rate of the nitrogen is 500 mL / min.

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Abstract

The invention relates to a method for preparing strontium hydroxide by alkali fusion roasting of celestite, which comprises the following steps: mixing celestite, an alkaline conversion agent and a binder to prepare pellets; and the prepared pellets are roasted in a protective atmosphere, and strontium hydroxide is obtained after impurity removal treatment. According to the method provided by the invention, no additional reaction solvent is needed, the carbon thermal reduction process and the carbonization process are reduced, gas byproducts such as H2S, SO2 and CO2 in the reaction process can be effectively reduced, and the energy consumption is greatly reduced. A high-activity solid-phase alkali environment is created around celestite particles, so that the reaction driving force for converting celestite into Sr (OH) 2 is favorably improved; and in the pellet roasting process, the reaction materials can keep relatively low diffusion resistance, so that the celestite can be directly used for producing a strontium hydroxide product under the condition of zero-sulfur low-carbon emission.

Description

technical field [0001] The invention belongs to the technical field of low-carbon and clean utilization of celestite resources, and in particular relates to a method for preparing strontium hydroxide by alkali-melting roasting of celestite. Background technique [0002] Strontium compound is an indispensable chemical raw material to support the rapid development of economic construction. Because of its characteristic enhanced performance and biochemical activity, it has unique applications in new energy, superconductivity, electronics, medical and other fields. Lazuli is the most common occurrence form of strontium ore resources in nature, and it is the most valuable strontium mineral for industrial development. Its main component is SrSO. 4 . Due to the characteristics of its crystal structure, celestite has extremely low solubility and reactivity in conventional acid-base solutions. Therefore, there is no process for producing strontium carbonate or strontium hydroxide by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02
CPCC01F11/02Y02P10/20
Inventor 陈思明段东平刘艳贾奇博钟莉李婷李焱周娥
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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