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Method for reducing sulphur content of strontium carbonate product

A strontium carbonate and sulfur content technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of not being able to meet the quality requirements of high-quality strontium carbonate, affecting the sustainable development of the regional strontium industry, and difficult to deal with the "three wastes" containing sulfur. Achieve the effects of strong practicability, easy operation and control, improved quality and added value

Inactive Publication Date: 2011-08-17
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process equipment is simple and easy to operate. The main problem is that the environmental pollution is serious, the treatment of sulfur-containing "three wastes" is difficult, and there are safety hazards such as hydrogen sulfide leakage; Quality requirements for strontium carbonate
As mentioned above, affected by climate and other factors, the sulfur content in strontium carbonate products is relatively high, which restricts the product's competitive advantage in domestic and foreign markets and affects the sustainable development of the regional strontium industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of method that embodiment 1 reduces the sulfur content of strontium carbonate product, comprises the following steps:

[0022] (1) The dried strontium carbonate powder (the total sulfur content after drying is calculated as 0.6165% in S, and the national standard stipulates that the total sulfur content is no more than 0.15%) is pressed at a solid-liquid mass ratio (kg / kg) of 1:6 Mix with water in a reslurry tank and stir into a homogeneous slurry.

[0023] (2) Add sulfur removal agent to the slurry—make the mass concentration of sodium sulfite and sodium hydroxide in the slurry system be 0.2% respectively, continue stirring and dissolving, then pump into a closed reactor, and heat up to 90°C under stirring, Convert the solid-phase free sulfur in strontium carbonate to soluble salt. Then keep it at this temperature for 30 minutes, so that the free sulfur in the solid phase is converted into soluble salt and dissolved in the liquid phase, and finally the slurry a...

Embodiment 2

[0027] A kind of method that embodiment 2 reduces the sulfur content of strontium carbonate product, comprises the following steps:

[0028] (1) The dried strontium carbonate powder (after drying, the total sulfur content is calculated as 0.6165% in S, and the national standard stipulates that the total sulfur content is no more than 0.15%.) according to the solid-liquid mass ratio (kg / kg) of 1:10 Mix with water in a reslurry tank and stir into a homogeneous slurry.

[0029] (2) Add desulfurizer to the slurry—make the mass concentration of sodium sulfite and sodium hydroxide in the slurry system be 0.5% and 1.0% respectively, continue stirring and dissolving, then pump into a closed reactor, and heat up to At 105°C, the solid-phase free sulfur in strontium carbonate is transformed into soluble salt. Then keep it at this temperature for 120 minutes, so that the free sulfur in the solid phase is converted into a soluble salt and dissolved in the liquid phase.

[0030] (3) Sepa...

Embodiment 3

[0033] A kind of method that embodiment 3 reduces the sulfur content of strontium carbonate product, comprises the following steps:

[0034] (1) The dried strontium carbonate powder (the total sulfur content after drying is calculated as 0.6165% in S, and the national standard stipulates that the total sulfur content is no more than 0.15%) is pressed at a solid-liquid mass ratio (kg / kg) of 1:7 Mix with water in a reslurry tank and stir into a homogeneous slurry.

[0035] (2) add desulfurizer in the slurry -- make the mass concentration of sodium sulfite and sodium hydroxide in the slurry system be 0.3% and 0.5% respectively, continue stirring and dissolving, then pump into the closed reactor, and heat up to At 100°C, the solid-phase free sulfur in strontium carbonate is transformed into soluble salt. Then keep it at this temperature for 60 minutes, so that the free sulfur in the solid phase is converted into soluble salt and dissolved in the liquid phase.

[0036] (3) Separa...

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Abstract

The invention relates to a method for reducing sulphur content of a strontium carbonate product. The method includes the steps as follows: (1) mixing strontium carbonate power with water according to a solid-liquid mass ratio of 1:6-10 and stirring the mixture to form uniform slurry; (2) at the stirring state, adding a desulphurizing agent in the slurry, raising temperature to 90-105 DEG C and keeping the temperature for 30-120min, and obtaining desulphurized slurry; and (3) separating the desulphurized slurry to obtain mother liquor and a filter cake, precipitating or settling the mother liquor by lime milk to obtain thiosulfate precipitate of calcium and pure water, wherein the pure water returns to the production stage of strontium carbonate, and the thiosulfate precipitate of the calcium is stacked as waste residue; and washing and drying the filter cake to obtain desulphurized strontium carbonate product. The method can effectively reduce consumption during treatment processes, avoid pollution, convert solid free sulphur to dissolvable thiosulfate, not only lower the content of the free sulphur in the product, but also improve the quality and the additional value of the strontium carbonate product.

Description

technical field [0001] The invention relates to the field of strontium carbonate production, in particular to a method for reducing the free sulfur content of strontium carbonate products. Background technique [0002] Strontium carbonate is mainly used in the fields of electronics, magnetic materials, fluorescent materials and military products. The content of strontium carbonate and total sulfur impurities in the product powder is very important for the development and applicability of the application field. [0003] The processes for producing strontium carbonate from celestite ore mainly include double decomposition conversion method and carbon reduction method. [0004] The metathesis conversion method is to react celestite mineral powder with ammonium carbonate to produce crude strontium carbonate, which is dissolved in acid (or ammonium salt), and then refined to remove impurities such as calcium and barium to obtain a corresponding relatively pure strontium salt solu...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 王树轩祁米香李宁王寿江李波李玉龙
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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