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Method for producing zinc hydrosulfite by using sodium hydrosulfite filtration residues

A technology of zinc dithionite and hydrosulfite, which is applied in the direction of thiosulfate/dithionite/polythionate, etc., can solve the problems of single use, inability to consume zinc powder waste residue, etc., and achieve raw material utilization High, less waste effect

Inactive Publication Date: 2011-06-15
王嘉兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its use is relatively single, and it is far from being able to consume the increasing zinc powder waste slag along with the increase in the production of sodium hydrosulfite.

Method used

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  • Method for producing zinc hydrosulfite by using sodium hydrosulfite filtration residues
  • Method for producing zinc hydrosulfite by using sodium hydrosulfite filtration residues

Examples

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Effect test

Embodiment 1

[0027] refer to figure 1 , a method for producing zinc dithionite with hydrosulfite filter residue, weighing 495kg of hydrosulfite waste residue, and converting the content of zinc hydroxide in the hydrosulfite waste residue to 297kg, after pulverization, it is heated to 300°C in a rotary kiln (1) at a high temperature, and then At the same time, zinc hydroxide starts dehydration reaction, and the zinc hydroxide in the sodium hydrosulfite waste residue is calcined into granular zinc oxide; meanwhile, the zinc sulfate in the sodium hydrosulfite waste residue has a pure substance content of 9.66kg in 495kg sodium hydrosulfite, and is decomposed into Zinc oxide and sulfur dioxide gas, so as to achieve the purpose of desulfurization; put the obtained zinc oxide and coke into the electric arc furnace (2) according to the pure mass ratio of 1:0.15, heat to 1300-1400 ° C, zinc oxide and carbon monoxide react to obtain Carbon dioxide gas and zinc vapor; Zinc vapor is condensed into zi...

Embodiment 2

[0029] refer to figure 1 , a method for producing zinc dithionite with hydrosulfite filter residue, weighing 495kg of hydrosulfite waste residue, and converting the content of zinc hydroxide in the hydrosulfite waste residue to 297kg, after pulverization, it is heated to 300°C in a rotary kiln (1) at a high temperature, and then At the same time, zinc hydroxide starts dehydration reaction, and the zinc hydroxide in the hydrosulfite waste residue is calcined into granular zinc oxide; meanwhile, the zinc sulfate in the hydrosulfite waste residue has a pure substance content of 9.66kg in 500kg hydrosulfite, and is decomposed into Zinc oxide and sulfur dioxide gas, so as to achieve the purpose of desulfurization; the obtained zinc oxide and coke are put into the electric arc furnace (2) according to the pure mass ratio of 1:0.1, heated to 1300-1400 ° C, and the zinc oxide and carbon monoxide react to obtain Carbon dioxide gas and zinc vapor; the zinc vapor is condensed into zinc p...

Embodiment 3

[0031] refer to figure 1, a method for producing zinc dithionite with hydrosulfite filter residue, weighing 495kg of hydrosulfite waste residue, and converting the content of zinc hydroxide in the hydrosulfite waste residue to 297kg, after pulverization, it is heated to 300°C in a rotary kiln (1) at a high temperature, and then At the same time, zinc hydroxide starts dehydration reaction, and the zinc hydroxide in the sodium hydrosulfite waste residue is calcined into granular zinc oxide; meanwhile, the zinc sulfate in the sodium hydrosulfite waste residue has a pure substance content of 9.66kg in 495kg sodium hydrosulfite, and is decomposed into Zinc oxide and sulfur dioxide gas, so as to achieve the purpose of desulfurization; put the obtained zinc oxide and coke into the electric arc furnace (2) according to the pure mass ratio of 1:0.20, heat to 1300-1400 ° C, zinc oxide and carbon monoxide react to obtain Carbon dioxide gas and zinc vapor; carbon dioxide reacts chemically...

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Abstract

The invention provides a method for producing zinc hydrosulfite by using sodium hydrosulfite filtration residues, which comprises the following steps of: heating the sodium hydrosulfite filtration residues at high temperature to 300 DEG C in a rotary furnace to start hydrogenating zinc hydroxide to obtain granular zinc oxide; simultaneously decomposing zinc sulfate in the sodium hydrosulfite filtration residues into the zinc oxide and a sulfur dioxide gas; throwing the zinc oxide and coke together into an arc furnace, and heating the zinc oxide and the coke to 1,300 to 1,400 DEG C to obtain zinc vapor; performing condensation and collection on the zinc vapor to obtain zinc powder; preparing suspension from the zinc powder, water and alcohol, and performing vulcanization reaction on the suspension and the sulfur dioxide to obtain the paste of zinc hydrosulfite crystals; and washing the paste of the zinc hydrosulfite crystals by using modified methanol-containing alcohol, and performing vacuum drying under the condition of lower than 70 DEG C to obtain zinc hydrosulfite finished products.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of sodium hydrosulfite filter residue, in particular to a method for producing zinc dithionite with sodium hydrosulfite filter residue. Background technique [0002] Sodium Hydrosulfite is commonly known as Sodium Hydrosulfite. It is a strong reducing agent. It is widely used in textile, printing and dyeing industries as dyeing aids and bleaching agents. It is also a raw material for synthetic dyes in the pharmaceutical industry and is also used in copper plates. Printing and analysis reagents, etc. [0003] In recent years, the market demand for hydrosulfite has become increasingly strong and growing rapidly. In particular, the demand for hydrosulfite in the textile and printing and dyeing industries has risen steadily, with an increase of 10-15% every year. In addition, with the production and development of domestic high-end newsprint and the improvement of the quality of ka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/66
Inventor 王嘉兴
Owner 王嘉兴
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