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A composite depressant for lead-silver slag flotation and its application process

A composite inhibitor, lead-silver slag technology, used in flotation, process efficiency improvement, solid separation and other directions, can solve the problems of difficult monomer dissociation of minerals, serious equipment corrosion, fast leaching speed, etc., to achieve reuse , The effect of low production cost and high recovery rate

Active Publication Date: 2017-12-22
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet treatment is characterized by fast leaching speed, high leaching rate, high cost, and serious equipment corrosion
Pyrochemical treatment has high requirements on raw materials, complex process and consumes a lot of energy
Flotation method, because gold and silver in lead-silver slag generally exist in the form of inclusions, it is difficult to achieve complete monomer dissociation of useful minerals, and the use of a single flotation method often has the problem of low recovery rate

Method used

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  • A composite depressant for lead-silver slag flotation and its application process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Lead-silver slag heating pretreatment with sulfuric acid: take the lead-silver slag, which contains 145g / t silver, 1.32g / t gold, and 7.85% of zinc. It is stirred and leached with waste electrolyte, and then 98wt% concentration is added. Sulfuric acid, the weight ratio of the added concentrated sulfuric acid to the lead-silver slag is 1:1, the initial acidity is 150g / L, the stirring frequency is 120r / min, the liquid-to-solid ratio is 3:1, the temperature is 90℃, and the reaction time is 1h. Solubles and residual slag, the supernatant is purified and returned to the hydro-zinc smelting system;

[0021] 2. Grinding process: Grind the residual slag, the grinding fineness is 0.038mm, the grinding concentration is 55%, and the content accounts for 89.5%. When grinding, add 2000g of lead-silver slag flotation compound inhibitor to the ball mill. t, the lead-silver slag flotation composite inhibitor is compounded by raw materials of the following weight components: 4 parts of s...

Embodiment 2

[0024] 1. Lead-silver slag and sulfuric acid heating pretreatment: take lead-silver slag, the lead-silver slag contains 291g / t silver, 1.43g / t gold, and 6.74% zinc. Use clean water as a solvent for stirring and leaching, and then add 98wt% concentrated sulfuric acid , The weight ratio of the added concentrated sulfuric acid to the lead-silver slag is 10:1, the initial acidity is 150g / L, the stirring frequency is 120r / min, the liquid-to-solid ratio is 4:1, the temperature is 90℃, and the reaction time is 2h. Dissolved matter and residual slag, the supernatant is purified and returned to the wet zinc smelting system;

[0025] 2. Grinding process: Grind the residual slag with a fineness of 0.038mm, a grinding concentration of 55%, and a content of 91.4%. When grinding, add 4000g of lead-silver slag flotation compound inhibitor to the ball mill. t, the lead-silver slag flotation composite inhibitor is compounded by raw materials of the following weight components: 6 parts of sodium s...

Embodiment 3

[0028] 1. Lead-silver slag pretreatment with sulfuric acid heating: take lead-silver slag, which contains 178g / t silver, 1.67g / t gold, and 7.24% zinc, and use the waste electrolyte produced by hydro-zinc smelting as a solvent for stirring and leaching , Then add 93wt% concentrated sulfuric acid, the weight ratio of the added concentrated sulfuric acid to the lead-silver slag is 1:1, the initial acidity is 180g / L, the stirring frequency is 120r / min, the liquid-to-solid ratio is 2:1, and the reaction temperature is 90 ℃, the reaction time is 4h, the solubles and residual slag are separated, the supernatant is purified and then returned to the hydrometallurgy system;

[0029] 2. Grinding process: Grind the residual slag, the grinding fineness is 0.038mm, the grinding concentration is 55%, and the content is 90.5%. When grinding, add the lead-silver slag flotation compound inhibitor 2000g / t, the lead-silver slag flotation composite inhibitor is compounded by raw materials of the fol...

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Abstract

The invention discloses a lead silver residue flotation composite inhibitor and an application technology, and belongs to the technical field of mineral processing and hydrometallurgy. The lead silver residue flotation composite inhibitor is composed of sodium sulfide, calcium oxide and sodium silicate. The application technology of the lead silver residue flotation composite inhibitor comprises the steps that clean water or a waste electrolyte solution generated by zinc hydrometallurgy is used as a solvent; after sulfuric acid is added, the temperature is increased, lead silver residues are preprocessed, soluble matter is generated after some zinc and iron compounds react with the sulfuric acid and enters a supernate, the supernate is returned to a zinc hydrometallurgy system after being purified to recycle zinc, gold and silver are concentrated into residues in advance, and gold, silver and zinc are floated and recycled after ore grinding is performed on the residues. The lead silver residue flotation composite inhibitor is simple in composition and low in cost and has the effect of efficient inhibition. The method has the advantages of being low in production cost, high in recycling rate and adaptability, wide in application range, environmentally friendly and the like and achieves secondary resource reutilization.

Description

Technical field [0001] The invention belongs to the technical field of mineral processing and hydrometallurgy, and is specifically a composite inhibitor of lead-silver slag flotation and an application process. Background technique [0002] About 80% of zinc in the world is produced by wet methods. On average, my country produces millions of tons of zinc leaching slag each year. The slag contains copper, lead, zinc and other metal elements and valuable silver, gold, cadmium, indium, etc. Rare metals. The long-term storage of this kind of slag not only takes up a lot of cultivated land, pollutes the environment, but also causes a great waste of resources. After wet leaching, most of the lead and silver are concentrated in the zinc leaching residue, which is also called lead-silver residue. With the increasing scarcity of resources and the increasing consumption of metals, the recovery of valuable metals from lead and silver slag has become an important subject of current research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/018B03D1/012C22B7/04C22B11/00C22B19/30B03D101/06
CPCY02P10/20
Inventor 郭艳华胡保栓廖雪珍彭建城孙运礼李国栋彭贵熊李健民
Owner NORTHWEST RES INST OF MINING & METALLURGY INST