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Method for preparing strontium carbonate in high purity from celestite ore in mid and low grades

A technology of high-purity strontium carbonate and strontium carbonate, which is applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of not conforming to high-purity strontium carbonate products, excessive Na and Cl content, and low barium content in celestite ore, etc. The effect of low production cost, stable quality and high product quality

Inactive Publication Date: 2006-12-06
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that the barium content of celestite ore is required to be low, otherwise the barium content index in the produced high-purity strontium carbonate will exceed the standard; Higher, the calcium content in the product may also exceed the standard; celestite ore often contains soluble sodium salts, such as NaCl, which may also cause the Na and Cl content in the product to exceed the standard
[0005] There are rich celestite resources in the Qaidam Basin of Qinghai Province in my country. The ore is characterized by low grade, generally about 40%, of which the barium content is low. The grade of celestite after enrichment through ore dressing can reach about 80%, which is suitable for The needs of producing high-purity strontium carbonate, but if adopt the method as reported in patent US3743691, strontium carbonate content is about 99% in the strontium carbonate product that obtains, but impurity ions such as barium, calcium, sodium, chlorine exceed the standard seriously, do not meet high-purity Strontium Carbonate Product Requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1. SrCO was obtained by flotation of celestite ore in Dafengshan, Qinghai 3 The content is more than 70%, soda ash is used for metathesis transformation to obtain crude strontium carbonate with a particle size of less than 120 mesh; the crude strontium carbonate is calcined at 1100°C for 5 hours to generate crude strontium oxide; 0.01% by weight of calcium sulfate and 10 times The weight of water is leached at 80-100°C for 5 hours to obtain a hot water solution of strontium hydroxide. Naturally cool the hot water solution of strontium hydroxide to room temperature, settle or filter to obtain wet strontium hydroxide octahydrate Sr(OH) 2 ·8H 2 O, Sr(OH) 2 ·8H 2 The recovery rate of O is 90.5%; then the wet Sr(OH) 2 ·8H 2 O is dissolved in deionized water (the amount of deionized water is 8 times the weight of strontium hydroxide), and controlled recrystallization is carried out under the condition of water temperature of 100°C and water resistance of 10000 ohm...

Embodiment 2

[0024] Example 2, SrCO was obtained by flotation of celestite ore in Dafengshan, Qinghai 3 The content is more than 70%, and ammonium bicarbonate is used for metathesis conversion to obtain crude strontium carbonate with a particle size of less than 120 mesh; the crude strontium carbonate is calcined at 1150 ° C for 4 hours to generate crude strontium oxide; 1% weight of sodium sulfate and 8 times the weight of water is leached at 80-100°C for 3 hours to obtain a hot water solution of strontium hydroxide, naturally cool the hot water solution of strontium hydroxide to room temperature, settle or filter to obtain wet strontium hydroxide octahydrate Sr(OH) 2 ·8H 2 O, Sr(OH) 2 ·8H 2 The recovery rate of O is 91.5%; then the wet Sr(OH) 2 ·8H 2 O is dissolved in deionized water (the amount of deionized water is 6 times the weight of strontium hydroxide), and the controlled recrystallization is carried out under the condition that the water temperature is 80°C and the resistance...

Embodiment 3

[0026] Example 3, SrCO was obtained by flotation of celestite ore in Dafengshan, Qinghai 3 The content is more than 70%, and ammonium bicarbonate is used for metathesis conversion to obtain crude strontium carbonate with a particle size of less than 120 mesh; the crude strontium carbonate is calcined at 1200 ° C for 3 hours to generate crude strontium oxide; 8% by weight of calcium sulfate and 5 times the weight of water is leached at 80-100°C for 2 hours to obtain a hot water solution of strontium hydroxide, naturally cool the hot water solution of strontium hydroxide to room temperature, settle or filter to obtain wet strontium hydroxide octahydrate Sr(OH) 2 ·8H 2 O, Sr(OH) 2 ·8H 2 The recovery rate of O is 92%; then the wet Sr(OH) 2 ·8H 2 O is dissolved in deionized water (the amount of deionized water is 4 times the weight of strontium hydroxide), and controlled recrystallization is carried out under the condition that the water temperature is 50°C and the resistance o...

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Abstract

This invention provides a method for manufacturing high purity strontium carbonate from medium- and low-grade celestite ore. The method comprises: (1) decomposing celestite ore into crude strontium carbonate; (2) calcining to obtain crude strontium oxide; (3) immersing in water to obtain strontium hydroxide solution; (4) recrystallizing to obtain high purity strontium hydroxide; (5) carbonizing to obtain high purity strontium carbonate. The method decreases the content of impurities such as barium, sodium, calcium and chlorine in the final product. The mother liquor of recrystallization can be used to manufacture industrial strontium chloride by double decomposition with bischofite, and magnesium hydroxide can be obtained as a byproduct. The method can increase the utilization rate of salt lake resources.

Description

technical field [0001] The invention relates to a new co-production process for preparing high-purity strontium carbonate and strontium chloride with magnesium hydroxide as a by-product, especially a process using abundant celestite mines in Qinghai and bischofite rich in salt lakes as raw materials. technical background [0002] High-purity strontium carbonate is mainly used in the fields of electronics industry, fluorescent materials and military products. [0003] The preparation of high-purity strontium carbonate is generally through the reaction of celestite ore powder and ammonium carbonate to generate crude strontium carbonate, and then prepare strontium hydroxide through acid dissolution, refining, and alkali precipitation, and then dissolve strontium hydroxide in water and introduce CO 2 Prepared by carbonization into high-purity strontium carbonate (see "Jiangsu Chemical Industry" No. 1, 1992, pages 20-22). In this method, the hydroxide radicals in the intermediat...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 龙光明王树轩李坤祁米香
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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