Separation of Biochar from Phosphorus-Rich Fraction of Bone Ash

Sanimax是一家从农业和食品废弃物中生产有价值产品的公司。由Sanimax管理的一个废物流是焚化的屠宰场废物（骨灰）。这种焚化的材料含有大量的钙和磷，这些钙和磷来自焚化的骨骼矿物。被焚烧的材料也被来自被焚烧的有机成分的碳污染。NSERC Engage项目的目标是溶解富含钙和磷酸盐的物质，净化溶液，沉淀磷酸二氢钙-一种动物饲料补充剂。对samanimax公司的一个骨灰样本的分析表明，它是由一系列颗粒组成的，有浅色和深色的颗粒。据推测，深色颗粒是富含碳的生物炭，浅色颗粒是焚烧的骨骼矿物。x射线衍射、拉曼和红外光谱以及磷酸盐浸出数据表明，磷酸盐含量不是粒度的函数。然而，试验密度分离有效地创造了较轻和较暗色调的材料。通过x射线衍射，红外光谱和磷酸盐浸出数据测量，这些由密度分离的材料在化学上是不同的。这项资助计划的目标是确定最佳的废物制备和分离技术，以分离密度较低和贫磷的焚烧生物炭与密度较高和富磷的焚烧骨骼矿物。这种分离将减少通过溶解和沉淀过程处理的焚烧质量。这反过来又会减少溶解和沉淀过程的规模和成本。

Sanimax is a company that produces valuable products from agricultural and food waste products. One wastestream that is managed by Sanimax is incinerated abattoir waste (bone ash). This incinerated material has asignificant calcium and phosphorus content from the incinerated skeletal mineral. The incinerated material isalso contaminated with carbon from the incinerated organic component. The NSERC Engage project goal is todissolve the calcium and phosphate-rich material, purify the solution, and precipitate dicalcium phosphatedihydrate - an animal feed supplement.Analysis of an example bone ash sample from Sanimax indicated that it is composed of a range of particlesizes, and particles of light and dark tones. It was hypothesized that the dark particles were carbon-rich biochar,and the lighter-toned particles were incinerated skeletal mineral. X-ray diffraction, Raman and infra-redspectroscopy, and phosphate-leaching data suggest that the phosphate content is not a function of particle size.However, a trial density separation effectively created lighter and darker-toned materials effectively. Thesematerials separated by density were chemically different as measured by x-ray diffraction, infra-redspectroscopy, and phosphate leaching data.This Engage Plus grant proposal goal is to determine the optimum waste preparation and separationtechnology to separate the less dense and phosphate-lean incinerated biochar from the more dense andphosphate-rich incinerated skeletal mineral. This separation will reduce the incinerated mass that will beprocessed by the dissolution and precipitation process. This in turn will reduce the size and cost of thedissolution and precipitation processes.