Magnetic fluid: New technology

The solution of a problem concerning the synthesis of a magnetic fluid for use in magnetic-fluid separators during the finishing of rich gold-containing heavy concentrates is suggested as a result of obtaining and stabilizing colloidal magnetite.     

New technology for making patterns

Despite recent advances in computer modeling of the casting process, in many sectors it is necessary to make trial castings that must be checked before the beginning of serial production. Making such castings can be a bottleneck in the development of new products, and creating precision patterns as expeditiously as possible is one way to circumvent this difficulty. The British Research Center for Casting has developed several modern technologies to resolve these problems. Delkam—Ural. Translated from Metallurg, No. 4, pp. 40–41, April, 1997.     

New advances in endovascular technology

We report an Italian family with maternally inherited encephalomyopathy including progressive external ophthalmoplegia, seizures, and neurophysiological evidence of brainstem dysfunction. Mitochondrial DNA analysis showed a heteroplasmic point mutation at position 5814 in the tRNA gene for cysteine (A5814G), previously reported in a 5-year-old girl of Portuguese origin. The mutation was very abundant (> 95%) in both muscle and blood from the proposita and was present in lower proportions (average 85 +/- 6%) in blood from three less severely affected maternal relatives. This observation confirms pathogenicity for the A5814G mutation.     

New technology for rolling v-shaped sections

Dneprodzerzhinsk Industrial Institute. Translated from Metallurg, No. 6, p. 36, June, 1990.     

高炉喷煤技术的新进展

巴西Escola de Minas-UFOP公司开发了一种类似于高炉风口的实验装置,采用三种煤粉混合喷吹并在喷吹前对煤粉进行预热的方式,在实验装置上进行了反复试验.根据试验结果,得出了如下结论:目前在业界尚未广泛采用的在喷吹前对煤粉进行预热,以及三种煤混合喷吹的工艺对提高煤粉燃烧率,从而优化喷煤技术是可行的.     

New production technology for welded noncircular pipe

A new production system for round or noncircular electrowelded straight-seam pipe has been developed by ZAO Severstal TPZ-Sheksna. The basic equipment employed is a TESA 127–426 pipe-electrowelding system, characterized by a high degree of automation and a distinctive set of equipment that affords considerable flexibility. The pipe produced is of high quality, with very desirable properties. In shaping the pipe blank on the TESA 127–426 system, separate two-subassembly linear shaping significantly improves the outcome, reduces time expenditure in roller replacement, and ensures high productivity.     

块石胶结矿柱充填新工艺

本文主要介绍金山金矿块石胶结矿柱房柱采矿法所进行的充填材料试验和块石胶结充填系统、充填工艺，以及取得的技术经济指标与经济效益。     

New technology and new challenges for assisted reproduction

As assisted reproduction technology advances, more types of procedures are becoming available, bringing more success at solving many types of infertility. In vitro fertilization has become simpler and less invasive, with success rates as high as 30% per cycle. Intracytoplasmic sperm injection has solved many types of male infertility. This article explains in vitro fertilization technology and discusses such ethical issues as embryo ownership, multiple births, and embryo genetic testing.     

New technology for pipe rolling on mini mills

A miniature pipe rolling system has been developed on the basis of two- and three-roller helical mills. This system permits the production of manufacturing pipe with high geometric precision: the diametric tolerance is ±5%. The new production technology has been adopted at OAO VMZ and at Sechang Steel plants (South Korea).     

环保型金回收新工艺

目前，金矿选矿工艺有两大技术难题：一是难处理金矿石和低品位金矿石的选冶；二是回收金的工艺过程中，在提高金回收率的前提下，如何减少环境污染。因此从环境保护角度出发，评述了几种具有环保意义的预处理工艺、浸出工艺及提金工艺，并对它们的技术特点和应用前景进行了分析。     

冶炼炉烟气治理新技术

针对某厂硅铁、结晶硅冶炼炉的烟气治理，使用自行研制的SCX-Ⅲ型湿式脱硫除尘装置，运行效果平稳。脱硫除尘效果比较理想，平均除尘率为98．8％，平均脱硫率达到78．8％，林格曼指数降至1级以下，各项污染指标均达到了相关国家标准。     

难处理金矿石氧化焙烧新工艺的开发

针对目前黄金矿石氧化焙烧工艺存在的金回收率低以及污染严重的问题，基于焙烧机理，开发了一种新型焙烧工艺，并分析了其优势。在此基础上，设计了原矿处理能力为2000t／d的含砷金矿石焙烧系统。该系统采用竖炉进行原矿焙烧，缩短了工艺流程；采用高温空气焙烧克服了沸腾炉焙烧系统中氧浓度低导致的焙烧不充分问题；采用蓄热室换热技术，提高能源利用率；并减少了污染物排放。