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A method for resource utilization of stone coal acid wastewater

A technology of acid wastewater and recycling, applied in the direction of chemical instruments and methods, applications, water/sewage treatment, etc., can solve the problems of low cost, less equipment investment, consideration of the overall composition of wastewater, etc., achieve low cost, zero discharge, The effect of efficient separation and recovery

Active Publication Date: 2021-04-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above chemical precipitation and crystallization methods are low in cost and less in equipment investment, but they only remove one type of component in the wastewater, without considering the overall composition of the wastewater, and have not effectively recovered valuable components.

Method used

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  • A method for resource utilization of stone coal acid wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] This embodiment provides a method for resource utilization of stone coal acid waste water, the main components and concentrations of the stone coal acid waste water are respectively: Na + 5.16g / L, K + 0.56g / L, NH 4 +1.75g / L, Mg 2+ 1.82g / L, SO 4 2- 8.92g / L. In addition, the stone coal acid wastewater also includes: vanadium 0.055g / L, chromium 0.0032g / L, nickel 0.0044g / L, copper 0.021g / L, cobalt 0.0039g / L, cadmium 0.0013g / L L, arsenic 0.0002g / L, zinc 0.083g / L, iron 0.086g / L, aluminum 0.023g / L, described method comprises the following steps:

[0093] (1) Selective recovery of heavy metals from stone coal acid wastewater through nitrogen-containing chelating resin adsorbent to obtain heavy metal enrichment and solution, the concentration of vanadium, chromium, nickel, copper, cobalt, cadmium, zinc, iron and aluminum in the solution are less than 0.1ppm, and the heavy metal enrichment is separated and recovered according to the existing process;

[0094] (2) Return th...

Embodiment 2

[0098] This embodiment provides a method for resource utilization of stone coal acid wastewater. The components and concentrations in the stone coal acid wastewater refer to Example 1. The method includes the following steps:

[0099] (1) Selectively recover heavy metals from stone coal acid wastewater through sulfide precipitant to obtain heavy metal enrichment and solution. The concentrations of vanadium, chromium, nickel, copper, cobalt, cadmium, zinc, iron and aluminum in the solution are all less than 0.1 ppm, the heavy metal enrichment is separated and recovered according to the existing process;

[0100] (2) The solution obtained in step (1) is returned to the stone coal leaching process, and a high-concentration saline solution is obtained through multiple cycles of leaching enrichment, and each ion concentration in the high-concentration saline solution is Na + 15.24g / L, K + 1.36g / L, Mg 2+ 12.33g / L, NH 4 + 4.97g / L, add ammonium bisulfate and magnesium bisulfate to...

Embodiment 3

[0104] This embodiment provides a method for resource utilization of stone coal acid wastewater. The components and concentrations in the stone coal acid wastewater refer to Example 1. The method includes the following steps:

[0105] (1) Selective recovery of heavy metals from stone coal acid wastewater through oxygen-containing and sulfur-containing chelating resin adsorbents to obtain heavy metal enrichment and solutions, in which vanadium, chromium, nickel, copper, cobalt, cadmium, zinc, iron and The concentration of aluminum is less than 0.1ppm, and the heavy metal enrichment is separated and recovered according to the existing technology;

[0106] (2) The solution obtained in step (1) is returned to the stone coal leaching process, and a high-concentration saline solution is obtained through multiple cycles of leaching enrichment, and each ion concentration in the high-concentration saline solution is Na + 126.46g / L, K + 23.83g / L, Mg 2+ 42.89g / L, NH 4 + 70g / L, adding...

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Abstract

The invention provides a method for resource utilization of acidic waste water from stone coal. The method comprises the steps of heavy metal recovery, salt enrichment and crystalline magnesium nitrogen double salt, jarosite precipitation, tail water recycling treatment and the like. The stone coal acidic wastewater described in the present invention is firstly separated and recovered from heavy metal ions, and then the magnesium nitrogen double salt and jarosite are respectively obtained by a multi-step crystallization method, so as to realize the efficient separation and recovery of different components in the wastewater and avoid the neutralization and desorption of traditional wastewater. A large amount of waste residue and valuable components produced by the ammonia process cannot be recycled. A variety of high value-added products have been obtained with high purity and no heavy metal entrainment, and the wastewater is returned to the stone coal leaching process after treatment to achieve zero discharge of wastewater . The method of the invention has the advantages of low cost, simple operation, clean and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment and resource utilization, and relates to a method for resource utilization of acidic waste water from stone coal. Background technique [0002] Stone coal is a vanadium-containing polymetallic mineral resource and one of the main raw materials for extracting vanadium. Besides vanadium, stone coal often contains aluminum, potassium, iron, calcium, magnesium, molybdenum, nickel, cobalt, copper, Titanium, chromium, uranium, selenium and other associated elements. Roasting-water leaching / acid leaching and direct acid leaching are common vanadium extraction processes for stone coal, so these processes will produce a large amount of acidic wastewater. The use of additives in the roasting process, stripping agent / desorbent in the vanadium enrichment process, precipitant in the vanadium precipitation process, and the leaching of various associated elements in the leaching process will cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C22B7/00C22B34/22C22B34/32C22B23/00C22B15/00C22B19/20C22B17/00C05G1/00
CPCC02F1/285C02F1/286C02F1/58C02F1/586C02F1/62C02F9/00C05C3/00C22B7/006C22B15/0084C22B17/04C22B19/26C22B23/0453C22B34/22C22B34/32C05D5/00Y02P10/20
Inventor 董玉明李会强张笛裴丽丽张红玲徐红彬张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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