Status: source gap
The keyword “sandustry processing plant” is real search demand, but the supplied current source record does not confirm Processing Plant as the exact entity name or provide a supported operating recipe. This page is intentionally held instead of filling the gap with a guessed building, input, output, cost, or layout.
What can be said safely
Sandustry does contain production and refining systems. The official Wiki lists buildings such as Shaker, Kinetic Press, Planter Box, Synthesizer, and other production structures, and the Research page explains that buildings and tools are unlocked through progression. That context is not enough to rename one of those structures “Processing Plant.”
If you are looking for a factory step, start with the verified Beginner Tips and Wiki navigation pages. They explain the broader material flow and link to confirmed resource terms. Use the current official Wiki search to match the phrase in your build before treating a community label as an official entity name.
What is deliberately not included
There is no recipe, cost, throughput, placement guide, best layout, or exact input/output table on this page. Those would require a current official entity page or a reproducible in-game check. The gap is also why this page should not be promoted as a confirmed answer or used as evidence for another keyword.
Next verification step
Capture the current building name and its official page, then compare it with the search term. If “Processing Plant” is an alias, redirect the keyword to the confirmed building. If it is a new entity, add a bounded material pack with the current recipe. Until then, the honest answer is that the terminology needs confirmation.