The three on-site signals of the maturity endpoint are: the pile temperature drops to near ambient temperature and the temperature difference does not exceed ±2℃ for two consecutive days; the manure/ammonia odor basically disappears and turns into an earthy smell; the color is a uniform dark brown or blackish-brown and the original shape of the raw material is no longer obvious. The arbitration...

The core principle of a coating drum in preventing caking is that it uses a rolling bed to evenly coat the granules with an anti-caking agent or coating oil, forming a hydrophobic barrier that blocks moisture migration between the granules and the external environment. The correct timing for the coating process is after cooling and before packaging. Deviating from this logic will significantly...

If the material clumps together when squeezed in the hand, and water seeps between the fingers but doesn’t drip, and crumbles upon contact with the ground, the moisture content is approximately 30%-40%. This is the on-site judgment window for organic fertilizer fermentation and wet granulation. The instrument method uses drying at 105℃ to constant weight as the arbitration standard (NY/T...

On September 29, 2026, the organic fertilizer plant’s trough fermentation workshop completed the installation and no-load/load testing of a chain plate compost turner. The workshop has three troughs arranged side-by-side. This testing focused on trough No. 1: 6m wide, 42m long, with an effective turning depth of 1.5m, designed to process 15 tons of chicken manure mixture with a moisture...

NPK production lines require drying and cooling because the granules, after granulation, have a moisture content of 15%-25% and a loose structure. Without drying, they lack strength and break during transport; without cooling, residual heat drives moisture migration, leading to clumping and mold growth after packaging. These two steps address the independent issues of “forming” and...

When the fermentation tank temperature is not rising or only partially heating up, the troubleshooting order should start with “whether the microorganisms are consuming food and oxygen,” rather than immediately suspecting the inoculant. First check the uniformity of turning and aeration, then check the moisture content and C/N ratio. Localized heating is often due to insufficient turning and...

Cow manure granulation does indeed have a lower risk of mold clogging and wall sticking than chicken manure: Chicken manure is extremely sticky and easily adheres to the inner walls of the equipment and mold holes even after composting, requiring higher standards for anti-sticking and dehydration; cow manure has a crude fiber content of about 30%-40%, and its stickiness decreases significantly...

The answer is: a single rotary drum granulator is suitable for large-scale continuous production lines with a capacity of 10-30+ tons/hour, producing dense granules with good sphericity; while a disc granulator is more suitable for small to medium-sized production lines with a capacity of 1-10 tons/hour and for switching between multiple product formulations. The two are not mutually exclusive;...

There’s no single answer to the drying temperature of organic fertilizer; it primarily depends on the fertilizer’s characteristics. The core value of bio-organic fertilizer is its live microorganisms, so drying must be designed to prevent damage. Ordinary organic fertilizers and compound fertilizers prioritize dehydration efficiency, allowing for a more relaxed temperature window. However...

Severe wall sticking in a disc granulator doesn’t necessarily mean the formula needs changing. Raw material moisture content exceeding 35%, peeling of the anti-stick coating on the inner wall of the disc, or scraper failure can all cause wall sticking. Checking moisture content and scrapers first, and then considering formula adjustments, is a more efficient troubleshooting approach. The essence...