{"id":31037,"date":"2026-07-04T22:18:24","date_gmt":"2026-07-04T14:18:24","guid":{"rendered":"https:\/\/shchimay.com\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/"},"modified":"2026-07-04T22:18:24","modified_gmt":"2026-07-04T14:18:24","slug":"5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems","status":"publish","type":"post","link":"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/","title":{"rendered":"5 Parameters Every Heap Leach Operator Should Monitor with Shanghai ChiMay Systems"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_50 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/#5_Parameters_Every_Heap_Leach_Operator_Should_Monitor_with_Shanghai_ChiMay_Systems\" title=\"5 Parameters Every Heap Leach Operator Should Monitor with Shanghai ChiMay Systems\">5 Parameters Every Heap Leach Operator Should Monitor with Shanghai ChiMay Systems<\/a><ul class='ez-toc-list-level-2'><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/#Parameter_1_pH_of_the_Lixiviant\" title=\"Parameter 1: pH of the Lixiviant\">Parameter 1: pH of the Lixiviant<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/#Parameter_2_Conductivity_of_the_PLS_and_Raffinate\" title=\"Parameter 2: Conductivity of the PLS and Raffinate\">Parameter 2: Conductivity of the PLS and Raffinate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/#Parameter_3_Flow_on_Application_and_Collection_Lines\" title=\"Parameter 3: Flow on Application and Collection Lines\">Parameter 3: Flow on Application and Collection Lines<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/#Parameter_4_Dissolved_Oxygen_Where_Bacterial_Leaching_Is_in_Play\" title=\"Parameter 4: Dissolved Oxygen Where Bacterial Leaching Is in Play\">Parameter 4: Dissolved Oxygen Where Bacterial Leaching Is in Play<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/#Parameter_5_Turbidity_at_Key_Junctions\" title=\"Parameter 5: Turbidity at Key Junctions\">Parameter 5: Turbidity at Key Junctions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/#How_the_Five_Parameters_Work_Together\" title=\"How the Five Parameters Work Together\">How the Five Parameters Work Together<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/#Implementation_Recommendations\" title=\"Implementation Recommendations\">Implementation Recommendations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/shchimay.com\/de\/5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\/#Closing_Notes\" title=\"Closing Notes\">Closing Notes<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 id=\"5-parameters-every-heap-leach-operator-should-monitor-with-shanghai-chimay-systems\"><span class=\"ez-toc-section\" id=\"5_Parameters_Every_Heap_Leach_Operator_Should_Monitor_with_Shanghai_ChiMay_Systems\"><\/span>5 Parameters Every Heap Leach Operator Should Monitor with Shanghai ChiMay Systems<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>Heap leaching is, on paper, one of the simplest hydrometallurgical operations in mining: stack the crushed ore on a lined pad, apply a leach solution, collect the pregnant solution at the toe, recover the metal. In practice, every successful heap-leach operation runs on a small set of water-quality parameters that the operators learn to watch obsessively. Get those parameters right, and recovery climbs, reagent costs fall, and the operation runs predictably for years. Get them wrong, and the heap can be on the wrong side of its design curve in a month. Shanghai ChiMay engineers have supported heap-leach operations on three continents, and the same five parameters come up again and again as the difference between a good and a great operation.<\/p>\n<h2 id=\"parameter-1-ph-of-the-lixiviant\"><span class=\"ez-toc-section\" id=\"Parameter_1_pH_of_the_Lixiviant\"><\/span>Parameter 1: pH of the Lixiviant<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Whether the leach is acidic (for copper, uranium, nickel) or alkaline (for gold cyanidation), pH is the single parameter that controls the rate of metal dissolution, the selectivity against gangue, and the longevity of the heap. Run too low or too high, and the kinetics drop off rapidly; the heap is consuming reagent without producing pregnant solution.<\/p>\n<p>The Shanghai ChiMay inline pH electrode is built for the harsh chemistry of leach solutions. Three locations matter:<\/p>\n<ul>\n<li><strong>Lixiviant header<\/strong> before application, to confirm the dosing system is hitting target<\/li>\n<li><strong>Toe collection<\/strong> at the pregnant leach solution (PLS) channel, to track the heap&rsquo;s apparent equilibrium<\/li>\n<li><strong>Barren return<\/strong> after solvent extraction or carbon adsorption, to confirm the recycle is on spec<\/li>\n<\/ul>\n<p>Continuous data at all three points, with alarms on rate-of-change, is the foundation of every well-run heap.<\/p>\n<h2 id=\"parameter-2-conductivity-of-the-pls-and-raffinate\"><span class=\"ez-toc-section\" id=\"Parameter_2_Conductivity_of_the_PLS_and_Raffinate\"><\/span>Parameter 2: Conductivity of the PLS and Raffinate<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In a copper SX-EW circuit, PLS conductivity correlates closely with dissolved copper plus acid. In a uranium leach circuit, it correlates with dissolved uranium plus sulfate. In a gold heap, it correlates with cyanide plus dissolved salts. In every case, conductivity is the operator&rsquo;s fastest signal that the heap is performing differently than yesterday.<\/p>\n<p>Shanghai ChiMay toroidal conductivity sensors are the right technology for this duty. They have no metal in contact with the solution, so they tolerate the harsh chemistry indefinitely. Plants that move from once-a-shift grab sampling to continuous toroidal monitoring routinely see SX feed control tighten, lab workload drop, and excursion response speed up by hours.<\/p>\n<h2 id=\"parameter-3-flow-on-application-and-collection-lines\"><span class=\"ez-toc-section\" id=\"Parameter_3_Flow_on_Application_and_Collection_Lines\"><\/span>Parameter 3: Flow on Application and Collection Lines<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Solution application rate per square meter of heap surface is the variable that operators tune most often, but it is also the variable that is hardest to measure reliably. Flow meters in slurry-laden or acid leach service have a hard life, and worn or biased flow data lead to bad decisions about heap rest periods, leach cycles, and water balance.<\/p>\n<p>The Shanghai ChiMay flow-meter family offers options matched to each duty:<\/p>\n<ul>\n<li>Paddle-wheel flow meters for clean lixiviant lines<\/li>\n<li>Turbine flow meters for instrumented PLS lines where higher accuracy matters<\/li>\n<li>Heavy-duty designs with hardened materials for acid service<\/li>\n<\/ul>\n<p>Mounting matters as much as the sensor itself. A <a href=\"\/tag\/flow-meter\/\" target=\"_blank\"><strong>flow meter<\/strong><\/a> installed downstream of a partially closed valve will give noisy data regardless of technology; Shanghai ChiMay application engineering reviews the piping layout before any meter is ordered.<\/p>\n<h2 id=\"parameter-4-dissolved-oxygen-where-bacterial-leaching-is-in-play\"><span class=\"ez-toc-section\" id=\"Parameter_4_Dissolved_Oxygen_Where_Bacterial_Leaching_Is_in_Play\"><\/span>Parameter 4: Dissolved Oxygen Where Bacterial Leaching Is in Play<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For bioleach operations \u2014 typically copper sulfide ores and refractory gold \u2014 dissolved oxygen in the lixiviant and in the heap interior is the rate-controlling factor. The acidophilic bacteria that catalyze sulfide oxidation need oxygen, and DO below about 2 mg\/L slows the kinetics rapidly. Above 5 mg\/L, the kinetics plateau, so the operating window is well defined.<\/p>\n<p>The Shanghai ChiMay DO transmitter platform, with optical (luminescent) sensors, holds calibration in the harsh chemistry of bioleach solutions for months at a time. Continuous DO data, paired with conductivity, ORP, and pH, gives the metallurgist a clear picture of where the heap is on its kinetic curve and what aeration changes might accelerate recovery.<\/p>\n<h2 id=\"parameter-5-turbidity-at-key-junctions\"><span class=\"ez-toc-section\" id=\"Parameter_5_Turbidity_at_Key_Junctions\"><\/span>Parameter 5: Turbidity at Key Junctions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Turbidity might seem like a secondary parameter in a heap leach, but it carries critical information at three points in the circuit:<\/p>\n<ul>\n<li><strong>Pregnant leach solution<\/strong> entering SX or carbon \u2014 high turbidity means entrained fines that will cause emulsion or coat the carbon<\/li>\n<li><strong>Raffinate before return<\/strong> to the heap \u2014 high turbidity here means failed clarification and trouble building up in the system<\/li>\n<li><strong>Discharge to environmental monitoring<\/strong> \u2014 turbidity is often a permit parameter and the first signal of upset<\/li>\n<\/ul>\n<p>The Shanghai ChiMay <a href=\"\/tag\/Turbidity-Tester\" target=\"_blank\"><strong>Turbidity Tester<\/strong><\/a> with programmable self-cleaning handles all three locations reliably. Plants that monitor turbidity continuously rather than by daily grab sample typically catch upsets hours sooner and avoid the most expensive consequences of fines breakthrough or emulsion formation.<\/p>\n<h2 id=\"how-the-five-parameters-work-together\"><span class=\"ez-toc-section\" id=\"How_the_Five_Parameters_Work_Together\"><\/span>How the Five Parameters Work Together<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>These parameters are most powerful when monitored together rather than individually. A small set of correlations gives the operator strong diagnostic power:<\/p>\n<ul>\n<li>pH down and conductivity up at the PLS often means the heap is consuming more reagent than expected<\/li>\n<li>pH steady and conductivity falling suggests the heap is approaching the end of its leach curve<\/li>\n<li>Flow up at the application header without conductivity response at the PLS suggests channeling<\/li>\n<li>DO falling in a bioleach circuit signals reduced bacterial activity, often before recovery drops<\/li>\n<li>Turbidity rising at the PLS without a chemistry change usually means a screen problem at the pad<\/li>\n<\/ul>\n<p>Each correlation is something an experienced metallurgist learns on the job. A Shanghai ChiMay multi-parameter monitoring system makes those correlations visible in real time, so operators benefit from accumulated experience the moment a parameter moves out of the expected envelope.<\/p>\n<h2 id=\"implementation-recommendations\"><span class=\"ez-toc-section\" id=\"Implementation_Recommendations\"><\/span>Implementation Recommendations<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A practical implementation roadmap for a heap-leach site looks like this:<\/p>\n<ul>\n<li><strong>Month 1:<\/strong> Install inline pH and conductivity at the lixiviant header, the PLS channel, and the raffinate return.<\/li>\n<li><strong>Month 2:<\/strong> Add turbidity at the PLS entry to SX or carbon, and verify all flow meters against tank-level surveys.<\/li>\n<li><strong>Month 3:<\/strong> Add DO if the operation is a bioleach; add discharge-point turbidity if compliance monitoring is required.<\/li>\n<li><strong>Month 4 and beyond:<\/strong> Integrate alarms, trend reports, and operator dashboards. Begin closed-loop control of acid or cyanide dosing once the data record is solid.<\/li>\n<\/ul>\n<p>Each phase produces value before the next is started, so the investment is self-funding throughout. By the end of the first year, the site typically has a monitoring program that pays back many times over through reagent savings, recovery improvements, and avoided compliance issues.<\/p>\n<h2 id=\"closing-notes\"><span class=\"ez-toc-section\" id=\"Closing_Notes\"><\/span>Closing Notes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A heap leach is simple in principle and demanding in practice. The five parameters above are the ones that experienced operators check first when something is off, and the technology to monitor them continuously is mature, affordable, and well understood. The Shanghai ChiMay product family was developed specifically for the harsh chemistry, abrasive solids, and remote installations typical of heap operations, and the engineering support that comes with the hardware is part of why operators consistently find that continuous monitoring is the easiest improvement available to a mature heap.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>5 Parameters Every Heap Leach Operator Should Monitor with Shanghai ChiMay Systems Heap leaching is, on paper, one of the simplest hydrometallurgical operations in mining: stack the crushed ore on a lined pad, apply a leach solution, collect the pregnant solution at the toe, recover the metal. In practice, every successful heap-leach operation runs on&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false},"categories":[1],"tags":[174,134481,11066],"translation":{"provider":"WPGlobus","version":"2.12.0","language":"de","enabled_languages":["en","zh","es","de","fr","ru","pt","ar","ja","ko","it","id","hi","th","vi","tr"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"zh":{"title":false,"content":false,"excerpt":false},"es":{"title":false,"content":false,"excerpt":false},"de":{"title":false,"content":false,"excerpt":false},"fr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false},"pt":{"title":false,"content":false,"excerpt":false},"ar":{"title":false,"content":false,"excerpt":false},"ja":{"title":false,"content":false,"excerpt":false},"ko":{"title":false,"content":false,"excerpt":false},"it":{"title":false,"content":false,"excerpt":false},"id":{"title":false,"content":false,"excerpt":false},"hi":{"title":false,"content":false,"excerpt":false},"th":{"title":false,"content":false,"excerpt":false},"vi":{"title":false,"content":false,"excerpt":false},"tr":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/shchimay.com\/de\/wp-json\/wp\/v2\/posts\/31037"}],"collection":[{"href":"https:\/\/shchimay.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shchimay.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shchimay.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shchimay.com\/de\/wp-json\/wp\/v2\/comments?post=31037"}],"version-history":[{"count":0,"href":"https:\/\/shchimay.com\/de\/wp-json\/wp\/v2\/posts\/31037\/revisions"}],"wp:attachment":[{"href":"https:\/\/shchimay.com\/de\/wp-json\/wp\/v2\/media?parent=31037"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shchimay.com\/de\/wp-json\/wp\/v2\/categories?post=31037"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shchimay.com\/de\/wp-json\/wp\/v2\/tags?post=31037"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}