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Recycling method for zinc dross

A technology of zinc scum and rough zinc, which is applied in the field of wet zinc smelting, can solve the problems of large zinc loss, high investment cost, and large amount of acid and alkali, and achieve the effect of increasing value

Inactive Publication Date: 2018-01-09
HUNAN SANLI GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Leaching + extraction (ion exchange) dechlorination" has cost and environmental protection problems such as large zinc loss, large amount of sewage treatment, and large amount of acid and alkali; zinc scum enters the volatilization kiln to produce sub-zinc oxide, and now the production of electrolytic zinc requires high investment costs.

Method used

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  • Recycling method for zinc dross
  • Recycling method for zinc dross

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add zinc scum with a chlorine content of 2.352%, a zinc content of 74.46%, and a weight of 4 tons to the Raymond machine for preliminary screening to obtain 0.8 tons of coarse zinc particles and 3.10 tons of zinc scum tailings, and 1.5 tons of zinc scum Add tailings to 18m 3 Add 15 cubic meters of zinc-containing waste water (zinc-containing 165mg / L) and rainwater mixed solution and 40 kg of sodium carbonate in the mixing tank, stir at normal temperature, the stirring speed is 60r / min, the pH value of the alkali cleaning reaction slurry is 8.2 , after the reaction time is 1.5 hours, filter residue and filtrate are obtained by pressure filtration, the weight of filter residue is 1.98 tons, the water content is 30%, and the zinc content of filtrate is 43mg / L, which is returned to the sewage treatment station for processing, and the filter residue is added in the zinc concentrate Put them together into a fluidized fluidized furnace and roast to obtain slag, the roasting te...

Embodiment 2

[0045] Put 2.552% chlorine content, 73.46% zinc content, and 4 tons of zinc scum into the Raymond machine for preliminary screening to obtain 0.8 tons of coarse zinc particles and 3.10 tons of zinc scum tailings, and 1.5 tons of zinc scum Add tailings to 18m 3 Add 15 cubic meters of zinc-containing waste water (zinc-containing 165mg / L) and rainwater mixed solution and 40 kg of sodium carbonate in the stirring tank, stir at normal temperature, the stirring speed is 60r / min, the pH value of the alkali cleaning reaction slurry is 8.1 , after the reaction time is 3 hours, filter residue and filtrate are obtained by press filtration, the weight of filter residue is 1.99 tons, the water content is 30%, and the zinc content of filtrate is 42mg / L, which is returned to the sewage treatment station for processing, and the filter residue is added in the zinc concentrate Put them together into a fluidized fluidized furnace and roast to obtain slag, the roasting temperature is 900° C., and...

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Abstract

The invention discloses a recycling method for zinc dross. The recycling method for the zinc dross comprises the following steps: step 1, the zinc dross is primarily sieved to obtain coarse zinc particles, the coarse zinc particles are used for producing a zinc ingot, and the remainder zinc dross tailings enter the next procedure; step 2, alkaline cleaning is carried out on the zinc dross tailingsby virtue of the mixed solution of zinc-containing wastewater in an electric zinc factory, and rainwater, pressure filtration is carried out on an alkaline cleaning reaction slurry after the reactionis completed to obtain a filtrate and filtration residue, and the pH value of the alkaline cleaning reaction slurry is 8-8.5; and step 3, high-temperature roasting is carried out on the mixture of the filtration residue and zinc concentrate to dechlorinate, and the chlorine content is lowered to be less than 0.15%. According to the recycling method for the zinc dross, zinc in the zinc-containingwastewater is recovered while chlorine in the zinc dross is removed; and the recycling method for the zinc dross is simple in process, low in cost and good in value-added effect.

Description

technical field [0001] The invention relates to the technical field of wet zinc smelting, in particular to a method for recycling zinc scum. Background technique [0002] At present, more than 75% of zinc in my country is produced by hydrometallurgy. In the zinc hydrometallurgy process, a certain amount of zinc scum is produced as a by-product, which is the slag formed by zinc oxide formed in the process of casting electrolytic cathode zinc into zinc ingots and entraining a certain amount of metallic zinc particles. This kind of oxidized slag reduces the melting and casting yield of zinc due to the entrainment of part of zinc. Zinc is destroyed, so that zinc melts into zinc ingots, and the direct recovery rate of zinc is improved. The zinc dross produced during the casting process of cathode zinc sheet mainly contains zinc, zinc oxide and zinc chloride. Since the zinc scum contains relatively high chlorine (generally 1-4%), it cannot be directly returned to the wet zinc s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/00C22B1/02C22B19/20C22B19/30
CPCY02P10/20
Inventor 赵均瑞龙玉高石明忠龙敏石建平罗来光
Owner HUNAN SANLI GRP
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