Process for recovering strontium and aluminium from metal strontium residue

A metal strontium and residue technology, applied in the field of inorganic chemical industry, can solve the problems of high production cost and poor product purity, and achieve the effects of energy saving, low price and high purity

Inactive Publication Date: 2005-04-27
祁顺东
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to produce and recover strontium and aluminum in the strontium residue by a clean method and obtain strontium salt and aluminum salt, overcome the shortcomings of high production cost and poor product purity in the past, and provide a kind of strontium salt with minimal environmental pollution and Production method of aluminum salt

Method used

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  • Process for recovering strontium and aluminium from metal strontium residue
  • Process for recovering strontium and aluminium from metal strontium residue

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Embodiment 1

[0028] Such as figure 1 or figure 2 The process flow shown: Use dry residue powder below 20 mesh to react with 20%-60% nitric acid, remove barium with 5%-30% sulfuric acid, then use 10-500ppm polyacrylamide aqueous solution to flocculate and settle, and discharge the sediment. ①In the preparation of nitrate, use 90%--98% concentrated nitric acid in the supernatant to precipitate mixed salts, and the concentration of nitric acid in the precipitated mother liquor is within 30%--60%. The dilute nitric acid solution is returned to use, and after the mixed salts are centrifugally deacidified, Heat to 85--100°C to melt the aluminum nitrate into a liquid, heat preservation and sedimentation to separate crude strontium nitrate crystals and crude aluminum nitrate molten liquid, then recrystallize the crude salt to separate strontium nitrate and aluminum nitrate crystals, and return the mother liquor for use. Strontium nitrate is centrifuged and dehydrated to obtain the product, and a...

Embodiment 2

[0030]The difference between this embodiment and embodiment 1 is that the present embodiment uses 15%--36% hydrochloric acid. Wherein the supernatant liquid in the preparation of the chloride salt is concentrated and evaporated to obtain the refined salt by recrystallizing the ternary phase diagram of strontium chloride-aluminum chloride-water, or directly concentrated and evaporated to crystallize the strontium chloride-aluminum chloride mixed crystal, The mixed salt is dissolved with more than 95% ethanol to separate the insoluble strontium chloride, the solution is distilled, the temperature is lower than 90°C, the liquid is discharged from the kettle, cooled and crystallized to obtain aluminum chloride hexahydrate, and the mother liquor is returned for use.

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Abstract

The process of recovering Sr and Al from Sr residue includes six steps of crushing, acidification, deposition to eliminate impurity, separation, re-crystallization of coarse salt and centrifugal drying. The present invention operates on the principle that Sr, Sr oxide and Sr hydroxide in the Sr residue react with dilute acid to form Sr salt and Al and beta-alumina produce Al salt in excessive acid, while the Ba ion as main impurity being converted and deposited with dilute sulfuric acid or chromate. The present invention has less environment pollution, low cost and high product purity.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry. Specifically, the invention relates to a method for recovering metal from metal residues in the field of inorganic chemical industry. Background technique [0002] It has been industrialized for many years to produce metal strontium (Sr) by reducing strontium oxide (SrO) with aluminum powder under high temperature and vacuum. The residues (also called slag or strontium residues, hereinafter collectively referred to as strontium residues) have been buried as waste residues, and some are directly When exposed to the outside, it will generate alkaline substance strontium hydroxide Sr(OH) when it is soaked by rainwater 2 , Alkalinizing the soil and groundwater, seriously damaging the ecological environment. With the rapid development of the alloy industry, the demand for metal strontium continues to expand, and the pollution of strontium residues is also becoming more and more serious. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C22B7/04
CPCY02P10/20
Inventor 祁顺东
Owner 祁顺东
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