What is the specialty of salt mining in engineering consulting?

1.About classification: In the classification of professional qualifications of engineering consulting units, according to (31) other - salt mining industry, or according to (31) other - non-metallic mineral mining and dressing industry - salt mining industry. There are also those divided by (15) light industry.

2.About the assessment: The assessment unit designated by the provincial salt administration department or the provincial salt administration department is also responsible for this project because the land and resources administrative department has the responsibility to standardize the management of land and resources ownership and protect the legitimate rights and interests of owners and users of natural resources such as land resources, mineral resources, and marine resources in accordance with the law.

In short, you need to consult these departments before deciding, and they will give the final answer for reference.

1. I feel that I should choose (30) comprehensive economics (not limited by specific majors);

Second, what level of qualification is required depends on the amount of your investment. There are three types of engineering consulting units: comprehensive, professional and manageable.

The consultation you do should seem to be comprehensive, both professional and administrative. The so-called Class B qualification is the business of project bidding that can undertake the project investment amount (excluding land requisition fees, large municipal supporting fees and demolition compensation fees) of less than 30 million yuan (see Order No. 79 of the Ministry of Construction). The situation you mentioned should also be competent, and a well salt development project of 30 million yuan must be able to get it.

Chemical Properties:

Preparation of sodium metal: 2NaCl = electrolysis = 2Na + Cl2 Electrolytic saline: 2NaCl + 2H2O = electrolysis = H2 + Cl2 + 2NaOH

Reaction with silver nitrate: NaCl + Agno3 = Nano3 + AgCl Concentrated sulfuric acid is added to the sodium chloride solution: 2NaCl + H2SO4 (concentrated) = 2HCl + Na2SO4

Physical. Physical properties: colorless cubic crystals or white crystals. Density.

Melting point. Boiling point 1465. Soluble in water, glycerol, slightly soluble in ethanol, liquid ammonia.

Insoluble in hydrochloric acid. It is slightly deliquescent in the air. Introduced into the salt pan by seawater (average sodium chloride content), dried by the sun, concentrated and crystallized, crude products are prepared, and coarse salt is easy to deliquescent in the air because of the impurities it contains.

Seawater can also be heated by steam, filtered by sand filter, and concentrated by ion exchange membrane electrodialysis to obtain brine (containing sodium chloride 160 180g l) by evaporation to precipitate salt halide gypsum, centrifugal separation, and the sodium chloride obtained is more than 95 (moisture 2) and then dried to obtain table salt. Rock salt and salt lake brine can also be used as raw materials, and the raw salt can be prepared by sun drying. When underground brine and well salt are used as raw materials, they are prepared by three-effect or four-effect evaporation and concentration, precipitation crystallization, and centrifugal separation.

It is used in the manufacture of soda ash and caustic soda and other chemical products, ore smelting. It is used in the food industry and fishing industry for salting, and can also be used as a raw material for seasonings and refined table salt.

Salt crystals (microscopic) Salt: One of the most commonly used seasonings in cooking, the scientific name is sodium chloride (chemical formula NACL), white crystals, hygroscopic, and should be stored in a dry place. Salt is also an indispensable substance for the normal physiological activities of the human body, 3 5 grams per person per day.

Table salt is widely distributed in nature. Seawater is rich in salt. Salt is also found in salt lakes, salt wells, and salt mines.

China has extremely rich salt resources. [This paragraph] how to prepare salt:

Industrially, salt is dried by seawater or boiled salt with well water and salt lake water to precipitate salt crystals. The table salt prepared in this way contains more impurities, which is called coarse salt. Coarse salt can be dissolved, precipitated, filtered, and evaporated to obtain refined salt.

NaCl, the main component of table salt, is an ionic compound. Pure sodium chloride crystal is a colorless transparent cubic crystal, due to the existence of impurities so that the sodium chloride in general is a white cubic crystal or a fine crystal powder, the specific gravity is, the melting point is 801, the boiling point is 1442, the relative density is gram cubic centimeter, the taste is salty, and it is easy to deliquescent when containing impurities; Soluble in water or glycerol, insoluble in ethanol, insoluble in hydrochloric acid, neutral in aqueous solution. The solubility in water increases slightly with increasing temperature.

When the temperature is lower than , NaCl·2H2O dihydrate can be obtained. Sodium chloride exists in large quantities in seawater and natural salt lakes, which can be used to prepare chlorine, hydrogen, hydrochloric acid, sodium hydroxide, chlorate, hypochlorite, bleaching powder and sodium metal, etc., which is an important chemical raw material; It can be used for food seasoning and pickling of fish, meat and vegetables, as well as for salting soap and tanning leather; Highly refined sodium chloride can be used to make normal saline, which is used in clinical ** and physiological experiments, such as sodium loss, water loss, blood loss, etc. Sodium chloride can be produced by concentrating crystalline seawater or natural salt lake or salt well water.

Crystal structure: The unit cell is a face-centered cubic structure, and each unit cell contains 4 sodium ions and 4 chloride ions.

Table salt has a wide range of functions: sterilization and disinfection, dental care, beauty, cleaning**, decontamination, medical treatment, important chemical raw materials ......

Solubility varies with temperature.

The solubility of sodium chloride does not change much depending on temperature, and the solubility of sodium sulfate varies greatly under the influence of temperature.

Your so-called foundation is not a foundation at all, from engineering consulting to land assessment, it is equivalent to cross-industry, and it is recommended that you stick to it. There is more room for development in engineering consulting, and land appraisal is basically limited to a few limited businesses. The land appraiser can take the test, this does not affect.

Of course, you have to continue.,This society is learned after leaving school.,What you learn in school is waste.,You don't want to learn now.,Or don't have the ability to learn.,How will you live in the future.。。。

Natural salt is unprocessed salt mined from seawater or salt mines.

2) Mass fraction of NaCl CaCl2.

3) The mass fraction of the solution after sampling and testing is that the solubility at t is not given, so it is impossible to judge whether it is a saturated solution or not.

1) 1:1 reason: The only soluble solute in the solution after sampling and detection is NaCl.

2) NaCl: g; Mass fraction of CaCl2 in well salt:

3) The last sentence of the title "and the resulting salt solution is still an unsaturated solution". The explanation is not a saturated solution at this temperature, and because.

The solubility at t is not given, so it is impossible to tell whether it is a saturated solution at t.

Hello. Yes, it's table salt, the kind that is very fine. A big bag is only 2 yuan.

It's the edible salt used. The bagged kind.

Not the kind of salt gnocchi that pickles pickles. That's coarse salt. Hehe.

You can use edible salt, but it is better to put it in the palm of your hand and dissolve it with a small amount of water, do not dissolve it completely, a little water is fine.

Salt can solve skin problems.

1. Control oil secretion in the T-zone: You can rub fine salt on the T-zone, gently massage and rest for 3 minutes, and then use the middle finger to squeeze the pores on both sides of the nose from the bottom up.

2 Remove acne marks and smooth ** bumps: dip a little salt on the fingertips, massage the acne marks or bumps in a spiral shape three times, and then take enough salt to apply to the parts that need to be "solved", and wash off after five or six minutes. Caution: Do not massage growing pimples.

3 Remove rough ** and dark spots: Wet the face with salt with water, massage for 1 minute, the same force as when washing the face, and draw a large circle on the cheeks from bottom to top with the tip of the nose as the center. Then rub the dark spot in a circular motion with the tip of your finger.

4. Remove armpit odor: salt has the effect of sterilization and anti-inflammatory, and salt can be directly smeared under the armpit when bathing. On weekdays, you can use cotton blocks soaked in salt water slightly lighter than sea water to carry around, and use it to remove sweat at any time.

5. Remove foot odor: Rub a large amount of coarse salt on the toes, between the toes and the soles of the feet, and rub them with your hands 5 6 times, rest for 5 minutes and rinse with water.

6 Care for back acne: Warm your body well after bathing, and apply more salt to your back when your pores are opened. Use the brush to massage for 1 minute, not too hard, just let the salt between the ** and the brush move.

Then use a sponge dipped in lightly salted water, stick it on your back for 10 minutes, and rinse it with water.

7. Eliminate double chin with salt: move the right finger with a lot of salt along the edge of the chin and right cheek from the middle to the right; Similarly, move the left finger to the left along the edge of the jaw and left cheek; Alternate between the left and right hands and do it rhythmically 50 times. Then wrap the salted part with plastic wrap, fix it with a hair band, rest for 10 minutes, rinse it off with water, and do it every other day.