| 单词 | chemical lead |
| 释义 | > as lemmaschemical lead chemical lead n. Metallurgy a refined lead of high purity suitable for use with industrial chemicals.Chemical lead may contain copper or certain other metals in limited amounts. ΚΠ 1827 Leeds Mercury 1 Dec. Dyeing utensils, consisting of..Chemical Lead Vessels, Lead Piping, Rings and Frames [etc.]. 1879 G. Lunge Theoret. & Pract. Treat. Manuf. Sulphuric Acid & Alkali I. i. 42 In the north of England..mills which roll the sheet-lead for..vitriol-works supply a special kind of ‘chemical lead’ which is made from the melted-up old chamber-lead, pipes, &c. 1924 A. J. Allmand & H. J. T. Ellingham Princ. Appl. Electrochem. (ed. 2) xvi. 317 The anode question appears to have been solved by the adoption of ‘chemical lead’. 2001 M. J. Schofield in R. K. Mobley Plant Engineer's Handbk. liii. 971/2 At strengths below 70°C chemical lead is the preferred material for tanks but at temperatures above 120°C corrosion becomes significant. < as lemmas |
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