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Novel method for separating strontium carbonate waste slag acid leaching slurry

A technology of strontium carbonate and a new method, applied in the direction of calcium/strontium/barium halide, calcium/strontium/barium chloride, etc., can solve the problem that the utilization rate of strontium cannot be significantly improved, shorten the service life of celestite resources, and shorten the service life of strontium resources. Waste and other problems, to achieve the effect of helping the acidity balance of the system, prolonging the product industry chain, and avoiding foam overflow

Inactive Publication Date: 2010-09-22
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 grade of celestite after beneficiation and enrichment can reach about 70% to 80%, which can meet the needs of carbon reduction to produce strontium carbonate. Refined, then produced by carbon dioxide carbonization, the utilization rate of strontium will not be significantly improved, which will cause a lot of waste of strontium resources and greatly shorten the service life of domestic lapis lazuli resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 A new method for separating strontium carbonate waste slag acid leaching slurry, comprising the following steps:

[0027] (1) Grinding and sieving 100kg of strontium carbonate waste slag so that the amount of particles passing through 20 mesh accounts for more than 90% of the total; then add water three times its weight and mix well.

[0028] (2) After heating the slurry to 30°C, add hydrochloric acid with a mass concentration of 12-17% to make the pH value 1-3, and adjust the amount of water so that the liquid-solid mass ratio is 5:1.

[0029] (3) Adding a neutralizing agent to the slurry leached in step (2) to make the pH value 4 to 7, so that the dissolved orthosilicic acid can be fully separated;

[0030] (4) After heating the slurry obtained in step (3) to 75°C, add a neutralizing agent again to make the pH value 5 to 6 (almost all the orthosilicic acid dissolved in the neutralized slurry is hydrated Precipitate in the form of silicon), and keep warm ...

Embodiment 2

[0032] Example 2 A new method for separating strontium carbonate waste slag acid leaching slurry, comprising the following steps:

[0033] (1) Grinding and sieving 100kg of strontium carbonate waste slag so that the amount of particles passing through 20 mesh accounts for more than 90% of the total; then add water 5 times its weight, and mix well.

[0034] (2) After heating the slurry to 75°C, add hydrochloric acid with a mass concentration of 12-17% to make the pH value 1-3, and adjust the amount of water so that the liquid-solid mass ratio is 8:1.

[0035] (3) Adding a neutralizing agent to the slurry leached in step (2) to make the pH value 4 to 7, so that the dissolved orthosilicic acid can be fully separated;

[0036] (4) After heating the slurry obtained in step (3) to 90°C, add a neutralizing agent again to make the pH value 5 to 6 (almost all the orthosilicic acid dissolved in the neutralized slurry is hydrated Precipitate in the form of silicon), and keep it warm for...

Embodiment 3

[0038]Embodiment 3 A new method for separating strontium carbonate waste slag acid leaching slurry, comprising the following steps:

[0039] (1) Grinding and sieving 100kg of strontium carbonate waste slag so that the amount of particles passing through 20 mesh accounts for more than 90% of the total; then add water 4 times its weight and mix well.

[0040] (2) After heating the slurry to 50°C, add hydrochloric acid with a mass concentration of 12-17% to make the pH value 1-3, and adjust the amount of water to make the liquid-solid mass ratio 6:1.

[0041] (3) Adding a neutralizing agent to the slurry leached in step (2) to make the pH value 4 to 7, so that the dissolved orthosilicic acid can be fully separated;

[0042] (4) After heating the slurry obtained in step (3) to 80-85°C, add a neutralizing agent again to make the pH value 5-6 (almost all the orthosilicic acid dissolved in the neutralized slurry is hydrated Silica form is separated out), and insulation is 1.2 hours,...

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PUM

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Abstract

The invention relates to a novel method for separating strontium carbonate waste slag acid leaching slurry. The method comprises the following steps: (1) crushing and sieving the strontium carbonate waste slag, adding water into the waste slag, and uniformly mixing the mixture; (2) adding hydrochloric acid after the slurry is heated to ensure the pH value is between 1 and 3, and regulating the water content to ensure that the liquid-solid mass ratio of the slurry is 5-8:1; (3) adding neutralizer into the slurry which is leached in the step (2) to ensure that the pH value of the slurry is between 4 and 7; (4) adding the neutralizer once again in the slurry after the slurry obtained in the step (3) is heated to ensure that the pH value of the slurry is between 5 and 6, and preserving the temperature for 1 to 1.5 hours to separate silica gel for modifying; and (5) centrifugally separating the slurry obtained in the step (4) to obtain solid phase and solution containing strontium chloride and calcium chloride. After the solid phase is washed, the waste slag and washing liquor are obtained, part of the washing liquor and the solution containing the strontium chloride and the calcium chloride are mixed and commonly used as raw material solution for reclaiming the strontium chloride, and the rest part returns to the step (1) to replace water for size mixing. The method ensures that the slurry has excellent separation performance.

Description

technical field [0001] The invention relates to the field of strontium chloride production, in particular to a new method for separating strontium carbonate waste residue acid leaching slurry. Background technique [0002] China is the world's largest producer and exporter of products such as strontium carbonate and strontium chloride. Affected by factors such as process technology and production costs, my country's strontium carbonate production is all produced by the black ash method, which uses celestite mineral powder After being mixed with reduced coal powder, it is roasted at high temperature to form strontium sulfide clinker, and the filtrate after water leaching is purified and then carbonized to obtain strontium carbonate product. This process has strong adaptability to ore, relatively simple production process and equipment, and low cost, but the utilization rate of strontium is usually 60-70%, and there are still a large amount of strontium-containing components in...

Claims

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Application Information

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IPC IPC(8): C01F11/24
Inventor 王树轩王寿江李宁李波
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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