32results about How to "Appropriate method" patented technology

An execution method for feeding a tiny tunnel into an ultra large section tunnel transversally is characterized in that excavating a tiny tunnel top region along its upper bench, enlarging the tiny tunnel towards two sides nearby the large section tunnel to excavate a hole gate segment; excavating an opening segment of the large section tunnel top region transversally from the hole gate segment, and mounting a hoop permanent steel centering in the opening segment after completing construction; excavating a upper part double lateral walls heading of the large section tunnel transversally; thereafter excavating the lower region of the tiny tunnel along a bottom bench, and excavating the opening segment lower region of the large section tunnel locating below the opening segment transversally; excavating the lower part double lateral walls heading of the large section tunnel longitudinally in the lower region of the opening segment; and then excavating the upper part center region and the lower part center region of the large section tunnel longitudinally in sequence. The execution method of the invention is safe and high-efficient.

The invention discloses a construction method of six-zone digging of a super cross section tunnel, which is characterized in that the cross section of the super cross section tunnel is divided into an upper left zone (1) part, an upper right zone (2) part, an upper middle zone (5) part, a lower left zone (3) part, a lower right zone (4) part and a lower middle zone (6) part in the mode of partitioning by upper and lower direction as well as left, middle and right directions, and construction in each part is carried out in an orderly mode. The method of the invention has stable structure, safety and high efficiency and can effectively quicken construction progress and save temporary support cost input.

The invention provides a method for preparing a fluid loss additive for drilling fluid. The fluid loss additive is mainly prepared from the following raw materials in part by weight: 30 to 35 parts of humic acid sodium, 20 to 30 parts of etherified starch, 10 to 15 parts of hydroxyethyl cellulose, 5 to 10 parts of polyacrylamide and 5 to 10 parts of water soluble silicone oil, preferably 30 parts of humic acid sodium, 25 parts of etherified starch, 10 parts of hydroxyethyl cellulose, 7 parts of polyacrylamide and 6 parts of water soluble silicone oil. The preparation method comprises the following steps of: heating the raw materials to 120 DEG C under sealing and stirring conditions and under the pressure of 0.8 to 1.2MPa, keeping the temperature for 8 to 10 hours to obtain a semi-finished product; and drying the semi-finished product at the temperature of between 85 and 100 DEG C, and adding 5 to 10 parts of sulfonated asphalt into the semi-finished product to obtain the fluid loss additive, wherein at the step of synthesizing the etherified starch, 50 to 80 parts of starch are soaked into 50 to 80 parts of 10-percent sodium hydroxide solution for swelling for 24 to 48 hours, the mixed solution is dried at the temperature of between 75 and 85 DEG C, the obtained product is ground to obtain the semi-finished product, 30 to 50 parts of chloroactic acid are added into 30 to 50 parts of the semi-finished product, the mixed solution is sealed and stirred, the pressure is controlled to be 0.8 to 1.2MPa, the PH value is adjusted to 7 to 8, and the mixed solution is heated to 135 to 145 DEG C and then kept at the constant temperature for 15 to 17 hours to obtain the etherified starch. The fluid loss additive possesses high anti-salt, anti-calcium and anti-high temperature properties, and has the effects of carrying drill cuttings and making mud cakes dense.

The invention provides a method for recovering iron concentrates from alumina red mud, adopting the following technical scheme: a medium-intensity magnetic separator is adopted to recover the strongly magnetic iron concentrates after red mud tailings are subjected to slag separation, then the obtained tailings are subjected to open rough separating and refined separating by a high gradient magnetic separator to recover weakly magnetic iron concentrates, combining the strongly magnetic iron concentrates and the weakly magnetic iron concentrates and carrying out dehydrating to obtain the iron concentrates. An slon vertical ring pulsating high gradient magnetic separator is selected to replace the traditional high gradient magnetic separator, and the medium-intensity magnetic separator is adopted to recover the strongly magnetic iron concentrates before. The method provided by the invention can be used for efficiently recovering the iron concentrates from the alumina red mud, and the obtained iron concentrates have high grades and good recovery rate; therefore, the method increases the utilization ratio of the alumina red mud, reduces the environmental pollution and is suitable for large-scale application.

The present invention relates to a biliary tract interior support frame containing medicine and its preparation method. Said biliary tract interior support frame includes tubular supporting tube which can open cavitary tract of biliary duct and is equipped with several medicine-releasing holes. The inner wall of the invented tubular supporting tube has a layer of medicine-stored layer made up by mixing medicine and excipient. Several biliary tract interior suppert frames can be series-connected together. Said invention also provides the concrete steps of its preparation method.