Coal sample preparation bias processing (1) After receiving the coal sample, coal detection equipment shall be used to test the coal, and shall be checked item by item according to the sample label, and the coal species, type, particle size, sampling location, packaging status, coal quality , sample collection and preparation time and other items are carefully written off and numbering stops. Prepare a coal sample label, specify the details, request an analysis of the project, and specify the sample size and quality if necessary.

(2) Prior to sample preparation, inspections shall be made based on GB474 and the relevant test method specifications, and the specifications shall be checked and all kinds of sieves must be checked to confirm their specifications and functional fit requirements.

(3) Check the coal sample preparation accuracy every quarter.

(4) After receiving the sample, it shall be processed and prepared as soon as possible (the low-lying coal will easily change during the arrangement). When the pre-drying is required, the dry temperature cannot exceed 50°C so as not to cause the coal-like seizure to change.

(5) Sample preparation manipulations should be severely stopped in accordance with the sample preparation specification, even if one breaks to the required particle size to prevent repeated ruptures.

(6) When you divide the points, even if you use the splitter to divide, if you use the cone quartile method, checkerboard reduction method, the sample must be well-mixed, and reduce the sample size and reduce the quality of the sample after preservation Meet GB474 rules.

(7) The use of sample processing for the process characteristics test items, and the strict rules of the sample preparation method for sampling, so that the sample particle size composition and quality meet the specification rules.

Anatomy of the analysis of laboratory coal quality is the last key to the whole system of mining, manufacturing, and chemical analysis, and the accuracy of the results is analyzed. Therefore, coal analysis equipment can be used to repeatedly determine the coal quality of the united sample twice, and the results of two repeated measurements can be determined. Difference (recursive limit and reproducibility critical difference).

1. Analyze the causes of deviation in laboratory test results:

(1) Method selection: All the coal test items are subject to the current national standards, and accidentally also use other alternative methods to stop the measurement. The practical scope differences of various approaches, such as fast ashing method, are suitable for routine analysis, while slow ashing method is suitable for arbitration and analysis, and unification of differences in sample measurement methods will incur a bias in the effect.

(2) Instrument setup: The important reason is that the instrument setup is not precise enough, and the reagent divergences form deviations. If the volumetric flask, etc., have not been calibrated, the balance of the analyzer will not be analyzed, the constant temperature zone of the cryogenic furnace will be unstable, and the standard solution will not be calibrated.

(3) Analytical laboratory analysis: An analysis of the staff's lack of a strong sense of obligation and indifferent quality awareness; unfamiliar skills in business operations, failure to understand all aspects of knowledge, and failure to follow the norm to stop the manipulation will create deviations.

2, the experimental effect of deviation processing steps (1) choose a new method to apply new methods to determine the end of the reference test, to prove its fineness and accuracy to meet the requirements of the parameters; to ensure the quality of the test equipment in the coal under the conditions of Can use advanced theory, precise measurement, fast speed, obedience to new instruments.

(2) Instrument setup and reagent 1 Samples should be checked before functioning to test the instrument function parameters, so that the instrument setup is in the best useful form. The control of the implementation of the premise should be in conformity with the rules and regulations of the national standard. The general analysis instrument used for identity analysis should ensure that its flexibility, precision and accuracy meet the requirements of the test method, stop the measurement verification, calibration and self-checking during the current period, and make its functional goals stable and reliable. Set up equipment for low-temperature heating, check the thermocouple and millivolt thermometers during the current period, and check the constant temperature area.

2 Inactive inspections shall be performed on the preparation, calibration and comparison of water, reagents and standard solutions.

3 strengthen the equipment to set up equipment handling, do a good job instrument verification and maintenance. Each equipment is equipped with equipment to set up a file on its own to record the date and time the equipment is installed and put into operation. After the defects are discovered, the cause and the important obligations and maintenance methods are searched in real time and recorded. During the current period, the instruments and meters shall be stopped and maintained, and standard coal samples shall be used to stop the calibration during the current period so as to prevent the system deviation caused by the instrument setup. It is also necessary to stop inactivity sampling to ensure that the utility function is normal, full-featured, fine-grained, and accurate enough to meet the request of the coal quality analysis instrument to detect things.

Analyze the coal laboratory workers 1 to enhance the training and essential cultivation of laboratory technicians.

All employees in the post, production, and chemical industry must obtain a job qualification certificate, and have a certain degree of professional knowledge, practical knowledge, and skilled manipulative skills; they have a precise understanding of the truth of the testing method, pace, and events that should be watched; and understand the instrument settings used. The principles of equipment design will use, debug, correct and maintain the maintenance; the reagents and solutions used in the analysis will be formulated and calibrated; the problems and signs presented in the course of events can be identified and disposed of in real time. The laboratory technicians should be strictly requested and audited so that the laboratory technicians can adhere to a high degree of commitment and develop well-crafted, superstitious work styles. They should be carefully controlled to prevent mistake deviations caused by ignoring carelessness, wrong manipulation, mistakes, and mistakes.

2 to enhance the quality of laboratory technicians temperament.

The inactive period inspection equipment sets the commissioning and calibration cancellation status before equipment installation. Check whether the test can be severely stopped according to the test specification. Check the record of the determination and disposal of the sample handling, testing, recorded records, and extraordinary signs. For each comparison of the measurement of the vacant samples, whenever the invention is shaken, the cause should be analyzed and discussed in real time. Check the calorimeter test original records, records whether the standard style, content can be complete, the data can be true and accurate, without the objective identification of the identity, to guarantee the originality, can not arbitrarily change. Check the effect calculations, and check, evaluate and correct.

3 enhance the effectiveness of laboratory testing quality control.

In the usual analysis process, the coal samples that are in doubt about the test effect, regarding some uncontrollable random deviations, asked the laboratory technician to stop and repeatedly measure the test data carefully and repeatedly so that the random deviations cancel each other out in the uniform value; Severe cancellation of the received coal samples, serial number and storage, the sample storage situation should be relative to ensure that the change does not affect the function of the sample, the ordinary coal samples for 3 months, complete standard and orderly date to stop the standard placement, in order to find .

Daily coal quality report, laboratory technicians report part of the real-time report, and at the same time, the effect of the analysis of coal quality every day, the implementation of laboratory technicians, technicians, part of the director of the three assessment. Made to meet the quality, quality and price. Establish a quality information base, complete quality control, and control computerization. In order to ensure accurate and reliable laboratory data, strict implementation of the certification track system, analysis of the entire history of coal quality testing, and the separation of user reactions to coal quality information, real-time stop the sample against the standard, acceptance of a unified sample analysis objectives, verify its Repeatability and reproducibility are within the scope of deviation, so as to improve inspection request specifications, prevent inspection mistakes, and ensure the stability and progress of coal quality monitoring and inspection.