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Method for preparing strontium hydroxide octahydrate granular crystals

A technology of strontium hydroxide octahydrate and strontium hydroxide, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problem of high impurity content, achieve low impurity content, avoid waste water discharge, and reduce chemical raw materials The effect of consumption

Inactive Publication Date: 2012-06-27
HEBEI XINJI CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the strontium hydroxide octahydrate obtained by this process is mostly light gray snow flake crystals with high impurity content

Method used

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  • Method for preparing strontium hydroxide octahydrate granular crystals
  • Method for preparing strontium hydroxide octahydrate granular crystals
  • Method for preparing strontium hydroxide octahydrate granular crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing strontium hydroxide octahydrate granular crystals, the specific steps are as follows:

[0024] (1) Grinding lapis lazuli and anthracite to 3.35 mm, mixing them at a weight ratio of 100:20, and calcining them in a rotary kiln at 900°C-1100°C to obtain crude strontium sulfide;

[0025] (2) leaching the crude strontium sulfide prepared in step (1) in water at 85°C-95°C for 2 hours to obtain a strontium sulfide solution;

[0026] (3) Heat and clarify the above-mentioned strontium sulfide solution in a clarification tank at 85°C-95°C for 1 hour;

[0027] (4) After hot filtering the clarified strontium sulfide solution in step (3), send it into the crystallization tank, and use the iodometric method to titrate the S in the solution in the tank. 2- content, according to S 2- The content of Na required for the reaction is calculated + content, thereby determine the required amount of NaOH, add excess 8% NaOH in the clarification tank, turn on the agita...

Embodiment 2

[0032] A method for preparing strontium hydroxide octahydrate granular crystals, the specific steps are as follows:

[0033] (1) Grinding lapis lazuli and anthracite to 5 mm, mixing them at a weight ratio of 100:40, and calcining them in a rotary kiln at 900°C-1100°C to obtain crude strontium sulfide;

[0034] (2) leaching the crude strontium sulfide prepared in step (1) in water at 85°C-95°C for 1 hour to obtain a strontium sulfide solution;

[0035] (3) Heat and clarify the above strontium sulfide solution in a clarification tank at 85°C-95°C for 2 hours;

[0036] (4) After hot filtering the clarified strontium sulfide solution in step (3), send it into the crystallization tank, and use the iodometric method to titrate the S in the solution in the tank. 2- content, according to S 2- The content of Na required for the reaction is calculated + content, thereby determine the required amount of NaOH, add excess 8% NaOH in the clarification tank, turn on the agitator, and the ...

Embodiment 3

[0040] A method for preparing strontium hydroxide octahydrate large particle crystals, the specific steps are as follows:

[0041] (1) Grinding lapis lazuli and anthracite to 4 mm, mixing them at a weight ratio of 100:30, and calcining them in a rotary kiln at 900°C-1100°C to obtain crude strontium sulfide;

[0042] (2) leaching the crude strontium sulfide prepared in step (1) in water at 85°C-95°C for 2 hours to obtain a strontium sulfide solution;

[0043] (3) Heat and clarify the above-mentioned strontium sulfide solution in a clarification tank at 85°C-95°C for 1 hour;

[0044] (4) After hot filtering the clarified strontium sulfide solution in step (3), send it into the crystallization tank, and use the iodometric method to titrate the S in the solution in the tank. 2- content, according to S 2- The content of Na required for the reaction is calculated +content, thereby determine the required amount of NaOH, add excess 8% NaOH in the clarification tank, turn on the agi...

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Abstract

The invention relates to a method for preparing strontium hydroxide octahydrate granular crystals, which includes steps: forging celestine and coal before leaching, obtaining crude strontium hydroxide octahydrate by chemical combination of the solution and sodium hydroxide, and recrystalizing the crude strontium hydroxide octahydrate at a certain temperature to obtain high-purity strontium hydroxide octahydrate granular crystals. Particles with diameter larger than 1000 micrometers account for more than 55% of the strontium hydroxide octahydrate granular crystals prepared by recrystalizing at temperature ranging from 72 DEG C to74 DEG C, the prepared strontium hydroxide octahydrate granular crystals are high in purity and low in impurity content. The conversion rate of Sr2+ in the celestine into strontium hydroxide is 100%, and economic benefit of the process is improved since the Sr2+ is converted into the strontium hydroxide to the greatest extent and the selling price of the strontium hydroxide is higher than that of the strontium carbonate.

Description

technical field [0001] The invention relates to a method for preparing strontium hydroxide octahydrate granular crystals. technical background [0002] Strontium hydroxide is a raw material for producing various strontium salts such as high-purity strontium carbonate and strontium lubricating wax. At the same time, it is used to produce stabilizers for polyethylene plastics and improve drying agents for drying oils and paints. It is used in Europe It is widely used in the refining process of beet sugar. [0003] The conventional production of strontium hydroxide in industry is obtained by reacting strontium nitrate (or strontium chloride) solution with sodium hydroxide, while strontium nitrate (or strontium chloride) is produced by calcining lapis lazuli Strontium carbonate is first produced, and then produced by reacting strontium carbonate with the corresponding acid or salt. The process of this method is as figure 1 As shown, the steps are numerous and complicated, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/10
Inventor 尹书成张卓标钱斌孙士坤韩恒朝董晓菁陈英军常文涛王玉凯董丛会
Owner HEBEI XINJI CHEM GRP
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