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Method for promoting separation of valuable metals and calcic gangue minerals in waste residue

A technology for valuable metals and gangue minerals, applied in the field of environmental engineering, can solve problems such as poor crystal quality, difficulty in effectively separating valuable components from gangue components, small grain size, etc., to achieve easy control conditions and reduce leaching Low toxicity and secondary pollution

Active Publication Date: 2014-07-09
湖南益石科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method aims at the problem of poor crystallization quality of metal compounds in waste residue, small grain size, and difficulty in effectively separating valuable components from gangue components. Through hydrothermal activation-hydration crystallization control, calcium-containing gangue minerals are converted into hundreds of microns calcium sulfate dihydrate crystals

Method used

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  • Method for promoting separation of valuable metals and calcic gangue minerals in waste residue
  • Method for promoting separation of valuable metals and calcic gangue minerals in waste residue
  • Method for promoting separation of valuable metals and calcic gangue minerals in waste residue

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Hydration Regulation of Calcium Sulfate Pure Compounds

[0028] Step 1, weigh 100 grams of anhydrous calcium sulfate and 10 grams of sodium sulfate and place them in a 1-liter autoclave, then add 300 milliliters of water, seal the autoclave, set the speed at 200 r / min, start the motor, heat up to 100 ° C, and keep the temperature constant Leave on for 2 hours.

[0029] Step 2, turn off the stirring device and the heating switch, let the material in the autoclave be naturally cooled to 80°C, open the autoclave, add 0.5 g of calcium sulfate dihydrate crystals (over 200 mesh) as a seed crystal, seal the autoclave, and wait for the material in the autoclave to Continue to cool naturally to 60°C.

[0030] Step 3, the material in the autoclave is lowered to 60°C and kept at a constant temperature for 2 hours, then the heating switch is turned off, and the material is cooled to room temperature naturally. Open the autoclave to take out the material, filter and rinse with wat...

Embodiment 2

[0033] Hydrothermal activation-hydration control of zinc-containing waste residue in a smelter

[0034] Step 1, mix the zinc-containing waste slag and sulfur produced by a smelter according to the ratio of M:S=1:1.2, where M represents the amount of all heavy metals in the dry waste slag, and S represents the amount of added sulfur . Add water according to the liquid-solid ratio of 3:1, mix the materials and put them into the autoclave, and seal the autoclave.

[0035] Step 2, turn on the motor, set the speed to 200r / min, raise the temperature to 200°C for 4 hours for hydrothermal activation, turn off the stirring device and the heating switch after the reaction, let it cool down to 100°C naturally and add 10 grams of anhydrous sodium sulfate to make Activator, keep stirring at 100°C for two hours, then turn off the heating and stirring device, let it cool naturally to 80°C, add 5 grams of calcium sulfate dihydrate crystals as seed crystals, stir for ten minutes, and age when...

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Abstract

The invention discloses a method for promoting separation of valuable metals and calcic gangue minerals in waste residue. The method comprises the following steps of: based on calcic waste residue as a treatment object, first, generating anhydrous calcium sulfate crystals by calcic gangue minerals in waste residue through hydrothermal activation; then, through hydrating and crystallizing regulation, hydrating anhydrous calcium sulfate crystals to calcium sulphate dihydrate crystals and enabling the calcium sulphate dihydrate crystals to grow to hundreds of microns; and then, separating the crystals and other substances by a physical separating method. The hydrothermal activating technology comprises the following steps of: adding an additive; and controlling hydrothermal temperature, hydrothermal time, stirring speed and liquid-solid ratio. The hydrating regulation technology comprises the following steps of: adding an excitant, controlling hydrating time, adding crystal seeds, controlling aging time and the like. According to the method provided by the invention, calcium and other valuable metals in waste residue can be recycled at the same time, so that the method is beneficial to realizing reduction, harmlessness and reclamation of waste residue.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and relates to a hydrothermal activation-hydration crystallization method for promoting the separation of valuable metals and calcium-containing gangue minerals in waste residues. Background technique [0002] The open-air stacking of waste slag not only occupies a large amount of valuable land resources, but also destroys landforms and vegetation, and due to long-term exposure to wind, sun, and rain, harmful components will continue to seep out, pollute the surrounding water system and soil through surface water or groundwater, and cause serious pollution. It can hinder the development and growth of plant roots, and it will accumulate in plant organisms, endangering human health through the food chain. On the other hand, waste residue contains many other useful components, such as gold, silver, copper, lead, zinc, etc., which can be exploited as secondary resources. Therefore, whether i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 闵小波柴立元袁翠玉梁彦杰陈杰柯勇李青竹
Owner 湖南益石科技有限公司
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