同样是地下开挖，为什么浅部软岩巷道以缓慢收敛变形为主，而深部高强度硬岩中却容易突发岩爆？
Why does shallow soft ground around underground openings converge slowly, while deep excavation in strong hard rock tends to fail suddenly as rockbursts?
直答：岩爆的本质是围岩积聚的弹性应变能超过岩石破坏所需能量后的猛烈释放，深部高强度硬岩恰好具备该条件。机理：地应力随埋深成倍增长，坚硬完整岩体刚度大、储能能力强，开挖卸荷前洞周已积蓄大量弹性应变能；临空面形成后应力向洞壁集中，能量释放速率一旦超过裂纹扩展的耗能速率，破裂便以片帮弹射甚至抛掷形式瞬间发生；软岩强度低，能量经塑性流动提前耗散，故表现为缓慢收敛。
A rockburst is the violent release of strain energy stored in surrounding rock once it exceeds what rock failure consumes — exactly what deep, strong hard rock provides. In-situ stress grows severalfold with depth while stiff intact rock is an able energy reservoir, so plenty of elastic strain accumulates near the opening before excavation unloads it. When the free face forms and stress concentrates on the tunnel wall, any release rate outrunning crack-growth dissipation turns failure explosive — slabbing, ejection, even throwing of rock — whereas weak soft rock bleeds the same energy away through plastic flow and merely squeezes.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
蔡美峰主编《岩石力学与工程》，科学出版社，2002年 ; 另见: P.K. Kaiser & M. Cai, Design of rock support system under rockburst condition, Journal of Rock Mechanics and Geotechnical Engineering, 2012, 4(3), pp.215-227
P.K. Kaiser & M. Cai, Design of rock support system under rockburst condition, Journal of Rock Mechanics and Geotechnical Engineering, 2012, 4(3), pp.215-227 ; see also: 蔡美峰主编《岩石力学与工程》，科学出版社，2002年
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.3724/sp.j.1235.2012.00215：Design of rock
#岩爆 #高地应力 #应变能释放
泡沫浮选凭什么实现目的矿物与脉石在同一矿浆中的选择性分离?
How does froth flotation separate valuable mineral particles selectively from gangue in the same pulp?
捕收剂优先吸附在目的矿物表面,使接触角增大、表面由亲水转为疏水,气泡上浮时疏水颗粒附着于气泡进入泡沫层刮出,亲水脉石则沉留在矿浆中。调节pH并添加抑制剂可进一步拉开两类矿物表面润湿性的差异,据此控制精矿品位与回收率。
Collector reagents adsorb preferentially onto the target mineral, raising its contact angle so the surface turns hydrophobic; rising bubbles then carry those particles into the froth for scraping off, while wetted gangue stays suspended in the pulp. Adjusting pH and dosing depressants widens the wettability contrast between the two surfaces, which is how concentrate grade and recovery are controlled.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
B. A. Wills 与 J. Finch《Wills' Mineral Processing Technology》(第8版)浮选章节
B. A. Wills & J. A. Finch, Wills' Mineral Processing Technology, 8th ed., flotation chapter
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780080311609 (2013)
#泡沫浮选 #润湿性
低品位铜矿石在进入火法冶炼之前，为什么要先用泡沫浮选富集？
Why is low-grade copper ore upgraded by froth flotation before it goes into pyrometallurgical smelting?
原矿铜品位通常只有百分之零点几，直接入炉会消耗大量燃料，还有过多金属随炉渣流失。浮选中捕收剂把黄铜矿表面改造成疏水性，矿粒附着气泡上浮与脉石分离，可将铜富集到百分之二十以上的精矿，显著降低熔炼能耗和金属损失。
Run-of-mine copper grades are often only fractions of a percent, so charging ore straight into the furnace wastes fuel and loses too much metal to slag. Collector reagents make chalcopyrite surfaces hydrophobic, letting mineral grains ride bubbles away from gangue; concentrates above twenty percent copper slash downstream energy use and metal loss.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
孙传尧主编《选矿手册》浮选工艺分册，冶金工业出版社
Wills' Mineral Processing Technology, 8th ed., Elsevier, chapter Froth Flotation
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780080311609 (2013)
#泡沫浮选 #选矿富集
现代炼钢厂为什么用连铸机全面取代传统的钢锭模浇注？两种工艺在质量和能耗上的差距有多大？
Why have integrated steelworks replaced traditional ingot pouring with continuous casting across the board, and how wide is the gap in quality and energy terms?
连铸把钢水直接凝成定尺长坯，省去钢锭脱模、均热炉加热和初轧开坯三道高耗工序，吨钢综合能耗大幅下降，金属收得率提高约八到十个百分点。激冷的定向凝固细化了铸态组织，中心缩孔与宏观偏析明显减轻，铸坯可热装直送轧机，生产节奏和质量一致性同步改善。
Casting steel straight into measured strands skips three energy-hungry steps — mould stripping, soaking-pit reheating and primary blooming — cutting total energy per tonne sharply and lifting metal yield by roughly eight to ten percentage points. Fast directional solidification refines the as-cast structure while easing centreline pipe and macrosegregation, and hot-charged strands roll directly, steadying both mill rhythm and product consistency.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：作者 / 书名 / 版次 / 出版社 / 年份齐备，仅缺独立比对证据；已在可信度报告单列披露，不再重复核验。
蔡开科《连续铸钢》，科学出版社，连铸坯凝固与质量控制章节 ; 另见: I. V. Samarasekera & J. K. Brimacombe, mould heat-transfer studies in continuous casting, Canadian Metallurgical Quarterly, 1979
I. V. Samarasekera & J. K. Brimacombe, mould heat-transfer studies in continuous casting, Canadian Metallurgical Quarterly, 1979 ; see also: 蔡开科《连续铸钢》，科学出版社，连铸坯凝固与质量控制章节
#连续铸造 #凝固组织
井下采空区里并没有任何火源，为什么遗留的碎煤反而最容易自燃发火？
With no ignition source anywhere underground, why is crushed leftover coal in the mined-out goaf the most prone to catching fire spontaneously?
直答：碎煤自燃不需要明火，它源于煤对氧气的吸附氧化放热，而采空区恰好提供了持续供氧又难以散热的封闭环境。机理：冒落矸石间的空隙让漏风缓慢穿过遗煤堆积体，氧化产热因围岩导热差、风量小而不断积聚，煤温升高又令氧化速率指数式加快，形成正反馈直至着火；漏风过强热量被带走、过弱氧气不足，故存在最危险的风速区间，工作面推进过慢使遗煤在氧化带内滞留过久同样诱发自燃。
Spontaneous combustion needs no open flame: it begins with exothermic oxidation as coal adsorbs oxygen, and the goaf supplies exactly that — steady oxygen feed inside surroundings that cannot shed heat. Air leaking through voids between fallen roof rock creeps past the loose coal; since strata conduct heat poorly and airflow is slight, reaction heat accumulates, and rising temperature speeds oxidation exponentially in a runaway feedback toward ignition. Strong leakage carries heat away while weak leakage starves oxygen, so a dangerous velocity band exists, and a slowly advancing face leaves coal sitting in the oxidation zone far too long.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
张国枢主编《通风安全学》，中国矿业大学出版社，2007年 ; 另见: H.L. Hartman, J.M. Mutmansky, R.V. Ramani & Y.J. Wang, Mine Ventilation and Air Conditioning, 3rd ed., John Wiley & Sons, 1997
H.L. Hartman, J.M. Mutmansky, R.V. Ramani & Y.J. Wang, Mine Ventilation and Air Conditioning, 3rd ed., John Wiley & Sons, 1997 ; see also: 张国枢主编《通风安全学》，中国矿业大学出版社，2007年
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL4465649W：Mine ventilation and ai
#煤自燃 #采空区漏风 #氧化升温带