Comprehensive process for recovering and treating indigo blue powder waste slag

A technology for recovery and treatment of slag, which is applied to the removal of alkali metal compounds, solid waste, alkali metal oxides/hydroxides, etc., to achieve the effects of reasonable process design, high yield, and simple and feasible production methods

Inactive Publication Date: 2004-12-29
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to solve the problem of extracting raw materials from the waste slag produced in the above-mentioned indigo powder production, and to provide a material that can fully reclaim sodium carbonate, potassium hydroxide, potassium salt and the like from the indigo powder waste slag. Comprehensive recovery and treatment process of indigo powder waste gangue

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  • Comprehensive process for recovering and treating indigo blue powder waste slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 (high metering)

[0037] Add 600kg of waste slag and 700kg of water at 60-80°C to the melting pot with a specific gravity of 1.38, keep it warm for 10-30 minutes, stir well, heat to 40-80°C, and wait for the waste slag to 40-80°C. Fully dissolved, and centrifuged to remove slag to generate mother liquor.

[0038] Pour the mother liquor into the crystallization tank for cooling and crystallization, and keep the temperature at 8-12°C for 30-48 hours for cooling and crystallization.

[0039] The cooling and crystallizing mother liquor is separated into crystals by means of pressure filtration or centrifugation, and the separated crystals are sodium carbonate with crystal water, and the crystals are calcined to produce anhydrous sodium carbonate.

[0040] The mother liquor from which the mixed crystals are separated is liquid A, pour liquid A into a lime pot, heat to 90-120°C, add 120kg of lime, stir well, keep the temperature at 100°C, heat for 30-60 minutes, th...

Embodiment 2

[0041] Example 2 (low metering)

[0042]Add 400kg of waste slag and 450kg of water at 60-80°C to the melting pot with a specific gravity of 1.31, keep warm for 10-30 minutes, stir well, heat to 40-80°C, and wait for the waste slag to 40-80°C. Fully dissolved, and centrifuged to remove slag to generate mother liquor.

[0043] Pour the mother liquor into the crystallization tank for cooling and crystallization, and keep the temperature at 8-12°C for 30-48 hours for cooling and crystallization.

[0044] The cooled and crystallized mother liquor is separated into crystals by means of pressure filtration or centrifugation, the separated crystals are sodium carbonate with crystal water, and the crystals are calcined to produce anhydrous sodium carbonate.

[0045] The mother liquor from which crystals are separated is liquid A, pour liquid A into a lime pot, heat to 90-120°C, add 90kg of lime, stir well, keep the temperature at 100°C, heat for 30-60 minutes, cool down to 70°C and pr...

Embodiment 3

[0046] Example 3 (medium metering)

[0047] Add 500kf of waste slag and 575kg of water at 60-80°C to the melting pot with a specific gravity of 1.345, keep warm for 10-30 minutes, stir well, heat to 40-80°C, and wait for the waste slag Fully dissolved, and centrifuged to remove slag to generate mother liquor.

[0048] Pour the mother liquor into the crystallization tank for cooling and crystallization, and keep the temperature at 8-12°C for 30-48 hours for cooling and crystallization.

[0049] The cooled and crystallized mother liquor is separated into crystals by means of pressure filtration or centrifugation, the separated crystals are sodium carbonate with crystal water, and the crystals are calcined to produce anhydrous sodium carbonate.

[0050] The mother liquor from which the mixed crystals are separated is liquid A, pour liquid A into a lime pot, heat to 90-120°C, add 105kg of lime, stir well, keep the temperature at 100°C, heat for 30-60 minutes, then cool down to 70...

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Abstract

The comprehensive indigo powder waste gangue slag recovering treatment process includes heating the mixture of waste gangue slag and water in a reactor to 4-80 deg.c for the waste gangue slag to dissolve fully; centrifugally separating to eliminate dreg and create mother liquid A; cooling mother liquid an in a crystallizing tank for 12-30 hr; press filtering or centrifuging to separate crystal as mixture of crystal carbonate and natron from crystallized liquid A; and calcining the crystal mixture to obtain anhydrous sodium carbonate. The said process can recover sodium hydroxide, potassium hydroxide, potassium carbonate, potassium salt and sodium carbonate in low cost and high yield.

Description

technical field [0001] The invention relates to a method for extracting substances from waste slag, in particular to a process for comprehensive recovery and treatment of waste slag from indigo powder. Background technique [0002] At present, the waste slag that can be produced in the production of indigo powder contains: sodium hydroxide, potassium hydroxide, potassium carbonate, potassium salt and more than 40% of sodium carbonate. Because waste gangue contains a lot of raw materials that are difficult to extract, sodium carbonate is not good for the recovery and utilization of potassium hydroxide and potassium salt. It is generally discarded or sold at a low price as waste gangue, and the expensive waste in waste gangue can no longer be fully utilized. raw materials. Contents of the invention [0003] The main purpose of the present invention is to solve the problem of extracting raw materials from the waste slag produced in the above-mentioned indigo powder productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C01D1/04C01D1/30C01D7/24
Inventor 贾升
Owner 贾升
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