56results about How to "Lower the build temperature" patented technology

Production of gypsum in phosphorous liquid involves preparing a phosphorous extracting liquid and a gypsum crystal whisker suspending liquid. The phosphorous extracting liquid is prepared by extracting 30 - 40% phosphorous acid with ores at 50 - 95deg.C for 2 - 4h, separating liquid phase and filtering to obtain products with H3PO4 3 - 4mol / L and Ca2+ 0.8 - 1.2mol / L. The suspending liquid is prepared by adding the said liquid into 30 - 35% sulfuric acid solution gradually, stirring and reacting at (50 - 100)deg.C for 120 - 150min. Hemi-hydrated or anhydrous gypsum whiskers are obtained after filtering the suspending liquid, cleansing with boiled water, and drying at (120 - 200)deg.C. The process reduces generating temperature and cost in production, shortens production time, and qualifies their performance, so that it can be widely used in production of gypsum whiskers.

The invention discloses a high-efficiency hydrate inhibitor containing corrosion inhibitor, which relates to the technical field of oil-gas hydrate. The hydrate inhibitor is a mixture of anti-agglomerant, inorganic salt and corrosion inhibitor. The use condition of the hydrate inhibitor is as follows: the pressure is 1.5 to 25 MPa, the temperature is minus 20 DEG C to 25 DEG C, and the volume percentage of systematic water is lower than 50 percent. The hydrate inhibitor can overcome the deficiency of the prior art, can be mixed at low concentrate and injected into oil flow in production or delivery, reduce the speed of nucleation, growth and agglomeration of the hydrate, and simultaneously reduce the corrosion rate of pipelines, slow down the corrosion and damage of salt to the pipelines,and is characterized by wide applicability, low cost and no corrosion to the pipelines.

The invention relates to a low-density high-strength andalusite fracturing propping agent and a production method thereof. The raw materials comprise: 65-75% of bauxite raw meal, 2-20% of andalusite, 5-20% of kaolinite, 1-8% of calcium aluminate cement, 3-10% of manganese ore powder. The production method comprises the following steps: weighing raw materials, grinding into fine powder, sieving, well mixing, adding into a rotating granulator for granulation, adding atomized aqueous vapor till the mixture becomes a spherical semifinished product, drying; sintering the semifinished product in a rotary kiln for 6-10 h with a kiln head temperature of 1300-1400 DEG C and a kiln tail temperature of 280-320 DEG C, taking the product out of the kiln to obtain a finished product. The product of theinvention has broken rates of 4.8% and 6.9% under pressures of 52 MPa and 69 MPa respectively, and has strength higher than that of other products of the same kind; the product has bulk density of 1.40-1.60 g / cm3, and apparent density of 2.60-2.85 g / cm3, and the density is lower than industrial standard; the product has high surface fineness, and can effectively reduce cost of petroleum fracturing.