论文部分内容阅读
粗铅是炼铅工厂半成品,多元铅基合金。金银测定一直采用火试金。该法操作繁琐,技术性经验性较强,远远满足不了生产科研需要,为此本文进行了一些试验。 一、设备与试剂 灰吹炉:试验室用高温炉;灰皿:取80筛目骨灰和500号硅酸盐水泥等体积混合,加水湿润(含水14％),模压成凹型(φ40mm高40mm),于室温干燥三个月后即可使用。 硝酸:优级纯;硫酸高铁铵指示剂:称取10g溶于100ml水中,加50ml硝酸(1+1)混合;硫氰化钾标准液(滴定度0.001gAg/ml)
Crude lead is a lead-smelter semi-finished product, multiple lead-based alloys. Gold and silver determination has been using fire test gold. This method is cumbersome to operate and has strong technical experience. It can not meet the production and scientific research needs far. To this end, some experiments are carried out. First, the equipment and reagents Ash furnace: high temperature furnace laboratory; ash dish: Take 80 mesh ashes and 500 Portland cement volume mixing, water humid (water 14%), molded into a concave (φ40mm high 40mm) Dry at room temperature for three months to use. Nitric acid: excellent pure; ammonium ferric sulfate indicator: Weigh 10g dissolved in 100ml of water, add 50ml of nitric acid (1 + 1) mixed; potassium thiocyanate standard solution (titer 0.001gAg / ml)