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Comprehensive utilization method of waste acid, caustic sludge and dedusting ash

A technology for alkali residue and waste residue, applied in the field of resource recycling, can solve the problems of inability to recover various valuable metals and pollution of the surrounding environment, and achieve the effects of reducing environmental burden, avoiding pollution, and avoiding redissolution reaction.

Inactive Publication Date: 2017-05-10
马守栋 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is randomly stacked and not properly disposed or recycled, it will inevitably cause serious pollution to the surrounding environment, and at the same time it will not be possible to recycle a variety of valuable metals

Method used

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  • Comprehensive utilization method of waste acid, caustic sludge and dedusting ash

Examples

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Effect test

Embodiment 1

[0029] A comprehensive utilization method of waste acid, alkali slag and dedusting ash, see figure 1 , including the following steps:

[0030](1) Mix dust removal ash and waste hydrochloric acid at a solid-to-liquid ratio of 1g: 6mL, and stir for 70min at 50°C at a stirring rate of 120r / min;

[0031] (2) adding alkali residue to the liquid obtained in step (1) to make the mass fraction of alkali residue be 85%, stirring and controlling the pH value at 8, reacting for 50min, filtering and separating to obtain the first solid (containing trioxide) solids of iron and carbon) and the first filtrate;

[0032] (3) The precipitating agent is added to the first filtrate to make the mass fraction of the precipitating agent 2.5%, stirred for 70min, filtered and separated to obtain the second solid (powder containing zinc, nickel, cobalt) and the second filtrate, the second filtrate The third solid (a mixed chlorinating agent containing potassium chloride, calcium chloride, magnesium c...

Embodiment 2

[0036] A comprehensive utilization method of waste acid, alkali slag and dedusting ash, comprising the following steps:

[0037] (1) Mix dust removal ash and waste hydrochloric acid at a solid-to-liquid ratio of 1g:4mL, and stir for 60min at 80°C at a stirring rate of 180r / min;

[0038] (2) adding alkali residue to the liquid obtained in step (1) to make the mass fraction of alkali residue be 80%, stir and control the pH value at 7.5, react for 60min, and filter and separate to obtain the first solid (containing trioxide) solids of iron and carbon) and the first filtrate;

[0039] (3) precipitating agent is joined in the first filtrate to make the massfraction of precipitating agent be 2%, stir 80min, filter and separate, get the second solid (powder containing zinc, nickel, cobalt) and the second filtrate, the second filtrate The third solid (a mixed chlorination agent containing potassium chloride, calcium chloride, magnesium chloride and sodium chloride) was obtained throu...

Embodiment 3

[0043] A comprehensive utilization method of waste acid, alkali slag and dedusting ash, comprising the following steps:

[0044] (1) Mix dust removal ash and waste hydrochloric acid at a solid-to-liquid ratio of 1g: 8mL, and stir for 90min at 40°C at a stirring rate of 100r / min;

[0045] (2) adding alkali slag to the liquid obtained in step (1) so that the mass fraction of alkali slag is 90%, stir and control the pH value at 8.5, react for 40min, filter and separate, get the first solid (containing trioxide) solids of iron and carbon) and the first filtrate;

[0046] (3) precipitating agent is joined in the first filtrate to make the massfraction of precipitating agent be 3%, stir 60min, filter and separate, get the second solid (powder containing zinc, nickel, cobalt) and the second filtrate, the second filtrate The third solid (a mixed chlorination agent containing potassium chloride, calcium chloride, magnesium chloride and sodium chloride) was obtained through evaporation...

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Abstract

The invention discloses a comprehensive utilization method of waste acid, caustic sludge and dedusting ash. The method comprises the following steps: (1) mixing dedusting ash and waste hydrochloric acid, and stirring at 40-80 DEG C; (2) adding caustic sludge into the liquid obtained in the step (1), stirring while controlling the pH value, and filtering for separation, thereby obtaining a first solid and a first filtrate; and (3) adding a precipitant into the first filtrate, stirring, filtering for separation to obtain a second solid (powder containing zinc, nickel and cobalt) and a second filtrate, and carrying out evaporative concentration on the second filtrate to obtain a third solid. The method sufficiently recycles the wastewater-acid washing waste acid, waste residue-caustic sludge and waste gas-dedusting ash, sufficiently and comprehensively treats the three industrial wastes to recover the valuable metals, provides chlorinating agents by performing synergic chloridizing roasting on polymetallic ores, and creates economic benefits on the premise of solving the problem of environmental pollution.

Description

technical field [0001] The invention belongs to the field of resource recycling and relates to a comprehensive utilization method of waste acid, alkali residue and dust removal ash. Background technique [0002] Steel sheets are an important raw material for the automotive industry, household appliances, container transport and the production of welded pipes. Because a layer of iron oxide scale is often formed on the surface of the steel plate that has been placed for a long time, the steel plate needs to be pickled to remove this layer of iron oxide scale before cold rolling, which will consume a large amount of hydrochloric acid, resulting in a large amount of waste hydrochloric acid. Generally speaking, the content of free hydrochloric acid in the waste acid produced by the cold rolling mill is about 10wt%, the content of free iron ions is about 20-30wt%, and also contains a small amount of nickel ions and cobalt ions; Take the cold rolling mill as an example, the amount...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B7/02C22B19/30C22B23/00C01D3/04C01F5/02C01F11/24
CPCC01D3/04C01F5/02C01F11/24C22B7/006C22B7/02C22B19/30C22B23/0469Y02P10/20
Inventor 马守栋吴兆钰
Owner 马守栋
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