Operative control of ore quality at the input of ore preparation operations of enrichment fabric

ABSTRACT The growth stimulating effect of growth hormone was determined with tetracycline as intravital marker of the longitudinal bone growth of proximal tibia in female Sprague-Dawley rats hypophysectomized at 60 days of age. After a post-operative control period of 15 days growth hormone (NIH-GH-B16) was given daily for 5 or 10 days followed by a 10 day period after its withdrawal. L-thyroxine was given in association with the growth hormone administration to potentiate the growth stimulation. A linear log dose-response relation was found for the two administration models with a high precision. The thyroxine-treatment increased the sensitivity of the bioassay. An administration period of 5 days was found sufficient for the bioassay of growth hormone in thyroxine-treated hypophysectomized rats. Compared with the earlier bioassay methods for growth hormone, the present bioassay is more favourable when all the factors, such as precision, sensitivity, specificity, and administration period are considered.

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PROBLEMS OF ORE PREPARATION FOR HEAP LEACHING

News of the Tula state university. Sciences of Earth ◽

10.46689/2218-5194-2021-4-1-322-330 ◽

2021 ◽

Vol 4 (1) ◽

pp. 322-330

Author(s):

V.I. Golik ◽

Keyword(s):

High Speed ◽

Heap Leaching ◽

Ore Preparation ◽

Cost Of Production ◽

The Cost

The issues of reagent leaching of metals in stacks in a historical cut are considered. It is shown that more than 1/3 of the chipped ore in size does not meet the conditions for extract-ing metals from it and requires regrinding. The features of mills are considered and the ad-vantages of grinding in a high-speed mill - disintegrator are determined. The information on innovations in the optimization of grinding equipment, which can reduce the cost of production by 10…15 %, is given.

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Experience in the development of innovative underground geotechnologies for mining of ore deposits

MINING INFORMATIONAL AND ANALYTICAL BULLETIN ◽

10.25018/0236-1493-2020-31-0-338-350 ◽

2020 ◽

pp. 338-350

Author(s):

I. V. Sokolov ◽

Y. G. Antipin ◽

N. V. Gobov ◽

I. V. Nikitin

Keyword(s):

Systematic Approach ◽

Underground Mining ◽

Mineral Resources ◽

Environmental Safety ◽

Ore Deposits ◽

Operating Costs ◽

Processing Waste ◽

Ore Preparation ◽

Additional Value

Based on an analysis of the design principles and practice of underground mining of ore deposits, the most significant features, trends to develop and directions to enhance of underground geotechnology in the field of opening and preparation, mining systems, filling works and ore preparation have been established. The main signs of innovation - scientific research and implementation in production in order to obtain additional value, are highlighted. Various approaches to the development of innovative underground geotechnologies are shown and a methodology for their justification is formulated based on a systematic approach implemented in the framework of the concept of integrated development of mineral resources and on the principles of economic efficiency, industrial and environmental safety, completeness of subsoil development. The experience of the IM UB RAS on the development and implementation of innovative underground geotechnologies in the design and industrial operation of a number of ore deposits is given, which significantly increased the completeness and quality of ore extraction from the subsoil, increased labor productivity in sinking and stoping works, reduced capital and operating costs for ore mining and to utilize mining and processing waste in the mined-out space.

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Control of Severe Thyrotoxicosis with Potassium Iodide and Propranolol

Scottish Medical Journal ◽

10.1177/003693308202700211 ◽

1982 ◽

Vol 27 (2) ◽

pp. 172-174

Author(s):

E. Fiona Nicol ◽

W. J. Irvine

Keyword(s):

Potassium Iodide ◽

Operative Control ◽

Alternative Regime

Conventional preparation of thyrotoxic patients for surgery using thiouracils and iodides may not be possible because of either, inability to obtain satisfactory therapeutic levels of the drugs or idiosyncratic reactions to the drugs. An alternative regime using potassium iodide and propranolol in combination has previously been shown to be both safe and effective in the pre-operative control of mild to moderate thyrotoxicosis. The use of this combination in a patient with severe thyrotoxicosis is described. Potassium iodide and propranolol can be used successfully to prepare patients with all degrees of thyrotoxicosis for surgery.

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Application of Magnetic and Ultrasonic Methods for Determining Parameters of Ferromagnetic Components in Iron Ore Slurry Flows

Acta Mechanica et Automatica ◽

10.2478/ama-2021-0025 ◽

2021 ◽

Vol 15 (4) ◽

pp. 193-200

Author(s):

Vladimir Morkun ◽

Natalia Morkun ◽

Vitaliy Tron ◽

Olga Porkuian ◽

Oleksandra Serdiuk ◽

...

Keyword(s):

Iron Ore ◽

Magnetic Measurements ◽

Slurry Flow ◽

Factors Affecting ◽

Ultrasonic Methods ◽

Ferromagnetic Component ◽

Accuracy Of Measurements ◽

Slurry Flows ◽

Component Content ◽

Operative Control

Abstract The article considers the method for controlling the ferromagnetic component content in slurry flow by ultrasonic and magnetic measurements. One of the basic factors determining the efficiency of magnetic separators at iron ore concentration plants is the quality of distribution of the ground ore into the product containing the ferromagnetic component and the waste rock. Due to the fact that in most cases, magnetic separators extract minerals with strongly magnetic properties, it is essential to find the magnetic component content in the input ore and products of its distribution in order to improve control over the technological process. Currently, low accuracy and reliability make existing means of operative control over the ferromagnetic component content in the slurry flow inefficient. Density of slurry is one of the primary disturbing factors affecting the accuracy of measurements, and this fact determines the necessity of measuring this parameter while controlling the ferromagnetic component content. Combined methods of measurements are a promising trend in designing sensors of useful component content in the slurry flow. The article describes the method for controlling the ferromagnetic component content in slurry flow by ultrasonic and magnetic measurements.

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Designs of new operating copper processing plants: process types, equipment selection, industry trends

Obogashchenie Rud ◽

10.17580/or.2021.01.08 ◽

2021 ◽

pp. 44-52

Author(s):

V. F. Baranov

Keyword(s):

Large Scale ◽

High Capacity ◽

Process Intensification ◽

Processing Plant ◽

Advantages And Disadvantages ◽

Sulphide Ores ◽

Flotation Cells ◽

Ore Preparation ◽

Processing Plants ◽

Technical Solutions

The article describes the largest operating processing plants for lowgrade copper sulphide ores of our time: 10 plants using the semi-autogenous grinding (SAG) technology and 10 plants using high-pressure grinding rolls (HPGR), with the output of 18 to 100 Mtpa. The unfavorable natural and economic factors are balanced by improved ore preparation and concentration technologies and high-capacity equipment units, combined with cost-saving layout solutions. The ore preparation sector is currently divided between the competing technologies of semi-autogenous grinding and HPGR. The article contains an overview of their advantages and disadvantages. The world’s largest monosection with the capacity of 55.5 Mtpa, that uses the SAG technology, is described. The role of the Drop Weght Test JKSimMet (A×b) parameter in the selection of the ore preparation method and the trend for using HPGR in the processing of strong ores are shown. Examples are provided for the consequences of an inadequate assessment of the feed strength in SAG-based plant designs. Examples of ore preparation process intensification through the use of HPGR in semi-autogenous grinding circuits are also given. The volume of impeller flotation cells installed has reached 600 m3. An overview of the two largest processing plants of our time with the output of 88 and 100 Mtpa of ore is presented. The innovative technical solutions of a newest low-capacity copper plant are highlighted. Based on the results of the overview, a future processing plant is predicted to use ∅12.8–13 m SAG mills, HPGRs with the roll diameter of 3 m, vertical VTM-7000 mills in ore grinding cycles, large fine screens, large-scale impeller flotation cells, and staged SFR and DFR flotation reactors.

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Soft tissue infections of the hand and upper limb

10.1093/med/9780199682874.003.0143 ◽

2021 ◽

pp. 351-360

Author(s):

Sophie Collier ◽

Barbara Jemec

Keyword(s):

Soft Tissue ◽

Antibiotic Prophylaxis ◽

Upper Limb ◽

Soft Tissue Infections ◽

Comprehensive Overview ◽

Operative Control

This chapter offers a comprehensive overview of the management of soft tissue infections of the upper limb, including operative control, antibiotic prophylaxis, and treatment in acute, chronic, and atypical cases.

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