{"id":7640,"date":"2026-09-01T13:36:32","date_gmt":"2026-09-01T05:36:32","guid":{"rendered":"https:\/\/www.sunriserendering.com\/reducing-ash-meat-bone-meal-sorting-crushing-process-control\/"},"modified":"2026-09-04T11:27:34","modified_gmt":"2026-09-04T03:27:34","slug":"reducing-ash-meat-bone-meal-sorting-crushing-process-control","status":"publish","type":"post","link":"https:\/\/www.sunriserendering.com\/de\/reducing-ash-meat-bone-meal-sorting-crushing-process-control\/","title":{"rendered":"Reducing Ash in Meat and Bone Meal: Feedstock Sorting, Crushing, and Process Control"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Ash content in meat and bone meal comes down almost entirely to how much bone mineral ends up in the final product \u2014 and that&#8217;s determined far earlier in the process than most plant managers assume. The three biggest levers are feedstock sorting before cooking, controlling crush particle size so bone fragments behave predictably through the press, and tightening process parameters so mineral-heavy fines don&#8217;t sneak into the finished meal. Get these three right and a plant can routinely move MBM from the 28-32% ash range down to 18-22%, which is the difference between commodity pricing and premium feed-grade contracts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Ash Content Is the Number That Makes or Breaks Your Price<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Buyers don&#8217;t just glance at protein percentage anymore \u2014 ash content is often the first spec they check, because it tells them how much actual usable protein and energy they&#8217;re paying for versus inert mineral. A meal running 35% ash isn&#8217;t just lower quality; it&#8217;s diluted. Every extra percentage point of ash is a percentage point of something else \u2014 protein, fat, digestible nutrition \u2014 that didn&#8217;t make it into the bag.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Feed formulators working with poultry and swine rations have tight tolerances for calcium and phosphorus. Meal that swings between 20% and 35% ash from batch to batch forces them to either discount your product heavily or reject it outright. Consistency matters as much as the average number.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is where the conversation about <a href=\"\/rendering-of-meat-what-it-is-and-how-its-done\/\">how meat rendering actually works<\/a> becomes relevant \u2014 ash isn&#8217;t something you fix at the end. It&#8217;s baked in from the moment raw material hits the receiving dock.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2026\/09\/reducing-ash-meat-bone-meal-sorting-crushing-process-control-inline-1.png\" alt=\"Close-up of meat and bone meal granules showing bone particle texture\"\/><figcaption class=\"wp-element-caption\">Close-up of meat and bone meal granules showing bone particle texture<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Feedstock Sorting: The Cheapest Lever You&#8217;re Probably Underusing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Most plants blend everything that arrives \u2014 trim, bone, viscera, fat \u2014 into one cooking batch, and that&#8217;s exactly why ash numbers bounce around unpredictably. Sorting raw material by bone-to-soft-tissue ratio before it ever reaches the cooker is the single cheapest ash-reduction step available, and it requires no new capital equipment in many cases.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Practical Sorting Categories<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High-bone streams<\/strong> \u2014 spines, rib cages, skulls \u2014 routed to a separate batch or blended at a controlled, lower ratio.<\/li>\n\n\n\n<li><strong>Soft tissue streams<\/strong> \u2014 trim, fat, viscera \u2014 processed with minimal bone contamination.<\/li>\n\n\n\n<li><strong>Mixed streams<\/strong> \u2014 everything else, blended deliberately rather than by accident.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For instance, a poultry processor separating frames and necks (bone-dense) from breast trim and skin (low-bone) before cooking can cut average finished-meal ash by 4-6 percentage points without touching a single machine setting. The catch? It requires discipline on the receiving floor \u2014 someone has to actually enforce the sort, not just suggest it.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"575\" src=\"https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/07\/\u7396\u5174\u6e7f\u6cd5\u7ebf-21-1024x575.jpg\" alt=\"\" class=\"wp-image-6520\" srcset=\"https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/07\/\u7396\u5174\u6e7f\u6cd5\u7ebf-21-1024x575.jpg 1024w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/07\/\u7396\u5174\u6e7f\u6cd5\u7ebf-21-300x168.jpg 300w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/07\/\u7396\u5174\u6e7f\u6cd5\u7ebf-21-768x431.jpg 768w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/07\/\u7396\u5174\u6e7f\u6cd5\u7ebf-21-1536x862.jpg 1536w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/07\/\u7396\u5174\u6e7f\u6cd5\u7ebf-21-2048x1150.jpg 2048w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/07\/\u7396\u5174\u6e7f\u6cd5\u7ebf-21-600x337.jpg 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Crushing Particle Size: The Variable Everyone Sets and Forgets<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bone crushed too coarse doesn&#8217;t cook through evenly \u2014 mineral stays locked in dense fragments that survive pressing intact and land straight in the meal. Bone crushed too fine creates a different problem: it turns into powder-like fines that flow with the protein fraction through screens meant to separate them out.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The sweet spot for most rendering lines sits between 8-15mm bone fragment size going into the cooker. That range is small enough for heat and pressure to properly break down the mineral matrix, but large enough that a well-tuned <a href=\"\/crusher-types-a-comprehensive-guide\/\">crusher<\/a> can still be selective about what passes through downstream screening.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why Crusher Type Matters More Than People Think<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hammer mills tend to over-pulverize bone, generating fines that are nearly impossible to screen out later. Roller crushers and specialized bone crushers give more control over final particle distribution \u2014 worth the switch if your ash numbers have been stubbornly high despite good sorting practices.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2025\/07\/\u5fae\u4fe1\u56fe\u7247_20230107134754-1024x768.jpg\" alt=\"\" class=\"wp-image-6985\" srcset=\"https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2025\/07\/\u5fae\u4fe1\u56fe\u7247_20230107134754-1024x768.jpg 1024w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2025\/07\/\u5fae\u4fe1\u56fe\u7247_20230107134754-300x225.jpg 300w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2025\/07\/\u5fae\u4fe1\u56fe\u7247_20230107134754-768x576.jpg 768w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2025\/07\/\u5fae\u4fe1\u56fe\u7247_20230107134754-1536x1152.jpg 1536w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2025\/07\/\u5fae\u4fe1\u56fe\u7247_20230107134754-600x450.jpg 600w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2025\/07\/\u5fae\u4fe1\u56fe\u7247_20230107134754.jpg 1706w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Disposal of poultry slaughter waste<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Process Control at the Cook and Press Stage<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Even with perfect sorting and crushing upstream, sloppy cooker and press settings can undo all that work. Under-cooking leaves bone structures partially intact, which then fracture unpredictably under press pressure and scatter fine mineral particles throughout the cake. Over-pressing, on the other hand, forces more solids \u2014 bone fines included \u2014 into the liquid phase, where they eventually re-concentrate in the meal after centrifuging.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A <a href=\"\/sunrise-batch-cooker-the-preferred-solution-for-harmless-treatment-of-animal-by-products\/\">batch cooker<\/a> running consistent temperature and residence time profiles gives operators a repeatable baseline to tune against \u2014 something continuous systems running on inconsistent feedstock volume often struggle to match.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Press Cake Screening<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Adding or upgrading a fine-mesh screening step after pressing, before the meal goes to the dryer, is one of the most underrated ash-reduction tools available. It physically pulls out bone fragments and fines that made it through cooking and pressing intact. Plants that install a secondary screen at this stage typically see another 1-3 percentage point drop in final ash \u2014 meaningful when you&#8217;re trying to hit a buyer&#8217;s contracted spec.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/11\/rendering-plant-Sunrise-1-1024x768.jpg\" alt=\"\" class=\"wp-image-6682\" srcset=\"https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/11\/rendering-plant-Sunrise-1-1024x768.jpg 1024w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/11\/rendering-plant-Sunrise-1-300x225.jpg 300w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/11\/rendering-plant-Sunrise-1-768x576.jpg 768w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/11\/rendering-plant-Sunrise-1-1536x1152.jpg 1536w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/11\/rendering-plant-Sunrise-1-2048x1536.jpg 2048w, https:\/\/www.sunriserendering.com\/wp-content\/uploads\/2024\/11\/rendering-plant-Sunrise-1-600x450.jpg 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">rendering plant Sunrise (1)<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Case Example: Dropping Ash From 32% to 19% at a Mixed-Species Plant<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A mixed poultry-and-swine byproduct plant we&#8217;ve worked with was stuck delivering MBM averaging 32% ash \u2014 enough to trigger discounts on nearly every shipment. Three changes over about four months brought that down to a consistent 19%.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Month 1:<\/strong> Introduced bone\/soft-tissue sorting at receiving, separating frames and bone-heavy cuts into a dedicated batch stream.<\/li>\n\n\n\n<li><strong>Month 2:<\/strong> Replaced an aging hammer mill with a controlled roller crusher targeting 10-12mm bone fragment size.<\/li>\n\n\n\n<li><strong>Month 3-4:<\/strong> Added a secondary fine-mesh screen post-press and tightened batch cooker residence time by roughly 8 minutes to improve consistency.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The plant didn&#8217;t need a full equipment overhaul \u2014 just targeted intervention at three specific control points. That&#8217;s usually how ash problems get solved: not with one dramatic fix, but with three or four smaller ones stacked together.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When Sorting Isn&#8217;t Enough: Bone Fraction Separation Systems<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For plants processing high-bone-ratio material as a rule \u2014 not an exception \u2014 basic sorting eventually hits a ceiling. That&#8217;s when dedicated bone fraction separation equipment, which mechanically pulls defatted bone out of the process stream before it ever reaches final grinding, becomes worth the capital investment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These systems cost more upfront than sorting or crusher upgrades, but they can pull ash content down 8-15 percentage points in bone-heavy operations \u2014 cattle and pork slaughterhouse byproduct streams especially. If your feedstock mix is structurally bone-heavy (large-animal slaughter, for example), no amount of downstream tuning will get you to premium-grade ash levels without addressing the bone volume directly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is also where facility layout matters \u2014 see our guide on <a href=\"\/what-are-the-standards-for-the-facility-requirements-for-rendering-plant-equipment-on-farms\/\">facility requirements for rendering plant equipment<\/a> for how separation systems fit into an overall plant design.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What This Means for Your Bottom Line<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A 10-percentage-point ash reduction doesn&#8217;t just improve a lab report \u2014 it directly changes what buyers are willing to pay per ton. Feed formulators routinely pay premiums of 10-20% for MBM under 20% ash compared to standard 28-32% product, because they&#8217;re getting more usable protein and energy per ton shipped. On a 5,000 ton\/month operation, that premium adds up fast.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The investment hierarchy is straightforward: start with sorting (near-zero cost), move to crusher and screening upgrades (moderate cost, fast payback), and only pursue full bone separation systems if your feedstock composition genuinely demands it. Most plants find that the first two steps alone solve 70-80% of their ash problem.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>High ash in meat and bone meal isn&#8217;t bad luck \u2014 it&#8217;s a bone-to-soft-tissue ratio problem that starts long before cooking. Here&#8217;s how sorting, crushing, and process control cut ash content and unlock premium pricing.<\/p>\n","protected":false},"author":1,"featured_media":4810,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[155,156,154,153],"class_list":["post-7640","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-bone-crushing-rendering","tag-low-ash-meat-meal","tag-mbm-processing","tag-meat-and-bone-meal-ash-content"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Reducing Ash in Meat and Bone Meal | sunriserendering<\/title>\n<meta name=\"description\" content=\"Learn how feedstock sorting, crushing particle size, and process control reduce ash in meat and bone meal and boost its market value.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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