4 results about "Saw dust" patented technology

The invention provides an external-soil spray seeding matrix and a preparation method thereof. According to the external-soil spray seeding matrix, soil, sludge compost, saw dust, a water-retaining agent, a binding agent and biological organic fertilizer serve as the main raw materials, stability can be maintained for a long time, and the fertilizer efficiency time is long; by means of usage of solid waste, environmental friendliness and low price are achieved, the greening effect can be effectively improved, and the problems that when spray seeding is conducted on a traditional matrix, the structure of the soil is poor, few granular structures exist, and nutrients are deficient and the problem of instability caused by invalidation of the binding agent are relieved. According to the external-soil spray seeding matrix, the sludge compost is adopted as the raw material, the non-renewable grass charcoal soil resource can be replaced, the cost can be effectively reduced, and harmlessness, reduction and resource utilization of sludge in a sewage treatment plant can be achieved; usage of the sludge compost, the saw dust and the biological organic fertilizer solves the piling-up problem of the solid waste. The preparation method of the external-soil spray seeding matrix is simple in technology, low in cost and suitable for large-scale production.

The invention discloses a method for preparing silicon nitride powder with saw dust, comprising the steps of: taking saw dust and silica sol as raw materials; sufficiently using the characteristics such as the porosity, the easy impregnating and the high-temperature carbonizing of the saw dust, and the easy grinding of the produced saw dust; drawing inorganic substance into the saw dust by means of sol-gel; filling the gel which takes silicon dioxide as main component into gaps of woods, so that the raw materials are evenly mixed; carbonizing, carbon thermally reducing and nitriding silica sol-impregnated saw dust in a high-temperature controllable atmosphere furnace to prepare Si3N4 ceramics powder. The method is characterized of obtaining the Si3N4 ceramics powder with higher purity, high alpha phase content and small grain diameter, and marrow granularity distribution range; preparing the high-quality Si3N4 ceramics powder with a technology with lower cost; reasonably and sufficiently utilizing the saw dust; and recycling waste material. The method is experimentally tested to have good performance for synthesizing the silicon nitride powder, and be an effective and feasible way.

The invention discloses a method for manufacturing polyurethane flexible foam packing plates. The method include steps of preparing materials, in other words, preparing, by weight, 30-40% of saw dust, 8-10% of adhesive and the balance leftovers of crops, pouring the materials into a glue mixer and uniformly mixing the materials; performing paving, in other words, coating a layer of adhesive on each single slab, paving each single slab on a steel plate, and enabling the surface, where the adhesive is coated, of each single slab to face upwardly; placing the steel plates on a conveyor belt; uniformly paving mixtures on the single slabs by the aid of a paver; laying a layer of single slabs on each mixture; performing pressurization and solidification, in other words, feeding paved plate blanks into a hot press, heating and pressurizing the plate blanks at the temperature of 140-170 DEG C, maintaining the pressure for 6-10 minutes and solidifying and forming the plate blanks; performing mold releasing and edge cutting, in other words, releasing the solidified plate blanks from molds and cutting the edges of the plates. Adhesive is brushed on the surface of each single slab which is paved on the corresponding mixture. The adhesive is polyurethane adhesive. The method has the advantages that the plates are high in bonding strength and elasticity, and the purpose of protecting environments can be achieved by the plates.