50results about How to "Solve the problem of raw materials" patented technology

Production of non-orientated cold-rolling silicon steel sheet is carried out hot milling, conventionally treating, acid washing, primary cold rolling, intermediate annealing, secondary cold rolling and product annealing. It costs low and has better quality, and it can decrease rolling force and has less harmful elements. It can be used to produce medium and small electric motor.

The invention relates to a household pure straw biogas fermentation technology. The household pure straw biogas fermentation technology comprises the following steps: preparing straws, a straw decomposing agent, pre-treatment liquid and an inoculant; carrying out pre-treatment on raw materials, and then feeding materials and starting fermentation to produce biogas; and reloading, further fermenting or stopping fermentation. The household pure straw biogas fermentation technology is built for a household biogas digester specially, pure straw biogas fermentation can be realized in the household biogas digester only adopting the pure straws, the straw decomposing agent and biogas slurry and biogas residue from a biogas digester in normal operation, biogas can be stably produced, dependence on excrements of livestocks which serve as raw materials is avoided, and the raw material problem of the household biogas digester is solved; no other extra material is needed, and no other extra facility is adopted, low-cost operation is maintained to the utmost extent, and no chemical pollution is produced.

The invention discloses a rock wool produced by using phosphorous slag and a preparation method thereof, the rock wool is prepared by phosphorous slag as main raw material and dolomite and bauxite both as auxiliary raw material, wherein the proportions of the raw materials by weight part are calculated as below: 60-85 parts of phosphorous slag, 1-8 parts of dolomite and 10-25 parts of bauxite. Compared with the current method for producing rock wool with natural volcanic rock or volcano metamorphic rock, the method according to the invention realizes the production of the rock wool by using the phosphorous slag as raw material, which not only settles the raw material problem about rock wool heat-preserving material during the production in regions without natural volcanic rock or volcano metamorphic rock, but also widens the comprehensive utilization scope of industrial solid wastes such as the phosphorous slag and the like; adopting the method can effectively utilize the phosphorous slag and other industrial solid wastes to develop novel product with high added value, conforming to the requirements of policies related to cyclic economy as well as energy conservation and pollution reduction, and simultaneously achieving excellent development prospect. The rock wool produced according to the method has the advantages of good fireproof and heat preservation performance, long use time and the like, and is particularly suitable for the use as heat preservation material in the industries such as heat preservation of building energy-saving wall, chemical industry, building material, etc.

The invention discloses a production method of a meta-position aramid paper fibrid. The production method comprises the following steps of: polymerizing m-phenylenediamine and isophthaloyl chloride in DMAC (M, N-dimethylacetamide) to form PMIA (polyisophthaloyl metaphenylene diamine) resin); producing hydrogen chloride gas by a neutralization reaction; diluting the resin, dispersing in a mother liquor and precipitating to obtain a fibrid suspending liquid in accordance with the manufacturing conditions of the meta-position aramid paper; pumping the fibrid suspending liquid and deionized water into a washing and filtering machine, and removing the solvent, additive and moisture containing in the fibrid to obtain the fibrid in accordance with the manufacturing conditions of the meta-position aramid paper. The method has advantages of low cost, high efficiency, stable process, simple used equipment and suitability for sustainable industrial production.