CN105441692A

CN105441692A - Method for washing and briquetting reduced silver powder

Info

Publication number: CN105441692A
Application number: CN201610015541.0A
Authority: CN
Inventors: 林知奎; 袁伟衍; 陈安东; 刘芳明
Original assignee: JIANGXI XINJINYE INDUSTRIAL CO LTD
Current assignee: JIANGXI XINJINYE INDUSTRIAL CO LTD
Priority date: 2016-01-12
Filing date: 2016-01-12
Publication date: 2016-03-30

Abstract

The invention discloses a method for washing and briquetting reduced silver powder. The method is characterized in that cathode mud is pretreated to remove base metals such as copper, lead and the like, and to separate and extract gold so as to obtain sub sliver liquor; the obtained sub sliver liquor is reduced by hydrazine hydrate, is not required to be naturally cleared, is directly filtered by use of a plate-and-frame press through a pneumatic diaphragm pump to obtain a filter cake; the filter cake, namely the reduced sliver powder, is subjected to blow-drying by virtue of compressed air, then, is washed by 2-3 times by introducing 65-DEG C hot water, is soaked and washed by 3 times by introducing dilute sulfuric acid, and is washed by twice by use of clear water, wherein filtering and washing are completed in the filter press; the washed sliver powder is kept at a temperature of about 15 DEG C, is not required to be dried, and is directly briquetted on a briquetting machine with 10-ton pressure; moisture of the briquetted sliver powder is reduced to be 1%; and the sliver briquettes are directly used for fusion casting. According to the method, the washing is complete, the water consumption is less, and the problems of strong peculiar smell, difficult operation and the like in a production process are solved; time from washing to fusion casting of a sliver ingot is shortened; loss due to the fact that part of fed fine sliver powder is carried into a dust collecting system by ventilation during fusion casting can be reduced, and a product obtained by fusion casting is guaranteed.

Description

A kind of washing silver powder that reduces presses the method for rolling into a ball

Technical field

The present invention relates to a kind of washing silver powder that reduces and press the method for rolling into a ball, belong to nonferrous metallurgy field.

Background technology

Under normal conditions, most domestic non-ferrous metallurgical enterprise (as copper metallurgy) can produce a large amount of anode sludge in process of production, and in the anode sludge, be rich in noble silver, palladium, platinum etc., after removing copper base metal, lead etc. through pre-treatment, again after chlorination parting, silver obtains further enrichment, and how separation and Extraction goes out silver, domestic use be mostly that S-WAT divides silver or an ammonia leaching point silver process.A point silvering solution formaldehyde reduction after using S-WAT to divide silver obtains raw Ag powder, and use point silvering solution after ammonia leaching point silver then to obtain thick silver with the reduction of water hydrazine, the shortcoming that above-mentioned technique exists is: rinsing is incomplete, consumes a large amount of clear water; To remain ammonia highly seasoned for reduction silver powder, manual operation bad environments, and when founding, to fly upward loss many for powder.

Summary of the invention

The object of the invention is to provide a kind of washing silver powder that reduces to press the method for rolling into a ball for prior art deficiency.

The method of reduction washing silver powder pressure group of the present invention is:

Negative electrode mud removes copper through pre-treatment, point silvering solution that lead obtains after waiting base metal and separation and Extraction gold need not naturally be clarified after hydrazine hydrate reduction, directly filter through pneumatic diaphragm pump sheet frame pressing machine, namely filter cake to reduce after the compressed air blow drying of silver powder first logical 65 DEG C of hot water wash 2-3 time, logical dilute sulphuric acid washing by soaking 3 times again, 2 times are washed afterwards with clear water, filtration washing all completes in pressure filter, silver powder after washing remains on about 15 DEG C, do not spend oven dry, directly pressure group on the balling press of 10 tons of pressure, the water content of pressure group silver powder is reduced to 1%, these banking groups are directly used in founding.

Beneficial effect of the present invention: thoroughly, water consumption is few, solves peculiar smell weight in production process in washing, the problem of difficult operation; Shorten the time from washing to founding silver ingot; When can reduce founding, the thin silver powder of feeding part is brought into the loss of dust collecting system by exhausting, and founding quality product is out guaranteed.

Embodiment

Claims

1. one kind reduce washing silver powder pressure group method, it is characterized in that: negative electrode mud removes copper through pre-treatment, point silvering solution obtained after plumbous base metal and separation and Extraction gold need not naturally be clarified after hydrazine hydrate reduction, directly filter through pneumatic diaphragm pump sheet frame pressing machine, namely filter cake to reduce after the compressed air blow drying of silver powder first logical 65 DEG C of hot water wash 2-3 time, logical dilute sulphuric acid washing by soaking 3 times again, 2 times are washed afterwards with clear water, filtration washing all completes in pressure filter, silver powder after washing remains on about 15 DEG C, do not spend oven dry, directly pressure group on the balling press of 10 tons of pressure, the water content of pressure group silver powder is reduced to 1%, these banking groups are directly used in founding.