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Roll crusher (roller crusher) is suitable for the fine crushing of the materials with feeding size less than 110mm, and finished particle size 3-30mm.
Roller diameter: 400-700mm
Applied materials: Limestone, slag, coke, coal, salt, chalk, gypsum, alums, brick, tile, etc.
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Some mini-mills need just 0.5 man-hours to produce a ton of steel, Innace says. Increased productivity means today’s steel mills don’t need as many workers. Steel industry employment peaked at 650,000 in 1953. By the start of this year, U.S. steelmakers employed just 143,000
Someone should tell Trump about Voestalpine AG’s steel plant in Austria, which reveals the reality of steel production and jobs. A Bloomberg News story from June 20, 2017 offered a fascinating look at how a modern plant can now produce high-quality steel with few workers. The plant in Donawitz, a two-hour drive from Vienna, needs all of 14 employees to make 500,000 tons of steel wire a year. The same mill in the 1960s would have needed as many as 1,000 workers to produce a similar amount albeit of lesser quality
“We have to forget steel as a core employer,” Voestalpine CEO Wolfgang Eder told Bloomberg. “In the long run we will lose most of the classic blue-collar workers, people doing the hot and dirty jobs in coking plants or around the blast furnaces. This will all be automated.” Voestalpine long ago concluded it couldn’t compete with the low-cost blast furnaces of the Chinese and others. So it has invested in technology to reduce costs while competing to make high-quality niche products. The so-called U.S. mini-mills have done something similar to stay competitive. Tariffs will let those mills raise prices and profits, but they won’t add much more than a token number of new jobs
The policy point is that Mr. Trump’s tariffs are trying to revive a world of steel production that no longer exists. He is taxing steel-consuming industries that employ 6.5 million and have the potential to grow more jobs to help a declining industry that employs only 140,000
If I was a sneaky world leader, I would undermine the raw material and manufacturing base of the US by overproducing base materials (steel, copper, etc) and producing cheap goods like phones, TVs, etc. and be the main supplier of API for vitamins and medicine. The US and the EU would become dependent on me (like a dealer hooking people on cheap crack). Then when the US can’t produce products and the manufacturing base is nearly gone, I would reduce my overproduction and keep only my most efficient plants which I built with funds from the cheap product addicted US. Then the US would be at my mercy. If I really wanted to be sneaky, I would create world conflicts to reduce the supplies of weapons the US has. Then the US would be unable to fully arm itself and I could attack or put the US even more at my mercy. Dang this sounds just like China!
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Ward’s iron mills utilized blast furnaces to extract iron metal from raw iron ore. The iron metal was then purified and finally turned into various iron products such as pig iron, iron rails, and iron nails
Back in the 1850s Ward was also the co-owner of the Ward Lake Superior Line, a large fleet of shipping vessels. He often did business at the old Milwaukee harbor, especially with Enoch Chase at Chase’s lakefront warehouse. At that time, Town of Lake, located south of the harbor mouth, was purely agricultural with family farms dotting the Lake Michigan shoreline. When Ward was looking for a site for his third mill, he remembered the Town of Lake and the high ground south of Deer Creek, seeing it as an ideal place for an iron mill
Ward’s primary motivation for building his third mill was the threat of competition by the Chicago, Milwaukee & St. Paul Railroad (CMStPRR). The railroad refused to buy Ward’s iron rails because Ward was selling iron rails to CMStPRR’s competitors. CMStPRR bought rails from England, and rumor had it that the railroad planned to open an iron mill to produce its own rails
Ward wanted no such competition and enlisted the help of Alexander Mitchell, president of Milwaukee’s largest bank and a director of the Chicago, Milwaukee & St. Paul Railroad. Ward offered Mitchell the position of treasurer of the Milwaukee Iron Mill and Mitchell accepted. Thus with Mitchell’s influence, the railroad began purchasing Ward’s rails
After filing incorporation papers for his new mill, Ward purchased a total of 114 acres from S.K. Worthington and David McDougall in the Town of Lake (now Bay View). Of the total acreage, 27.5 acres were reserved for the mill yard and company buildings. The approximate boundaries are the present-day streets of Russell on the south, S. Bay on the west, Lake Michigan on the east, and Lincoln Avenue on the north. The remaining acreage was platted into small building lots, to be sold to workers. A number of boarding houses, including the Palmer House on S. St. Clair Street that housed 60 men in 1870, and 24 company houses were constructed. The first company buildings were an office building, a machine shop, and a rail mill
Ward appointed Stephen Clement president and J.J. Hagerman superintendent. Many skilled workers were recruited from England, such as furnace builders William Dennis and James Meredith, furnace keepers Stephen Bird and Joseph Starkey, “puddler” David Morgan, and iron “roller” James Hidge. (A puddler was a highly skilled worker who purified pig iron by heating and stirring it.) “Ward must have materially depopulated the English blast furnaces,” reported Bernhard Korn in The Story of Bay View. The first furnace began operating in April 1870
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