CN102320809A - Preparation and application of rock salt concrete - Google Patents

Abstract

The invention belongs to the technical field of chemical engineering, and relates to technology for preparing rock salt concrete by potassium ore tail salts, tailings and waste salts and applications. The invention is characterized in that the raw materials comprises: 30-85% of rock salts, 2.5-15% of magnesium oxide, 2.0-15% of magnesium chloride, 5.5-15% of water, 5-25% of fillers; the production characteristics of the rock salt concrete are that: (1) the production process is simple, and rock salt concrete slurry can be prepared by proportionally mixing magnesium oxide, a magnesium chloride aqueous solution, fillers, and rock salts; (2) the main raw materials required by the production are various halites, tail salts, waste salts or salt-containing slag generated during mining, and the production has low cost and no pollution; (3) the production is energy-saving and environment-friendly, and facilitates three-waste comprehensive utilization and environment protection; (4) the rock salt concrete can be used for backfill of salt mine gob areas, mine pits or roadways; the rock salt concrete can be used for pouring of various building foundations, salt pan pool plates and dam revetment in salt lake regions.

Description

Concrete making of a kind of rock salt and application

Technical field

The invention belongs to the salt chemical engineering technical field, relate to a kind of potassium ore deposit tail salt, tailings, abraum salt of utilizing and make concrete technology of rock salt and application.

Background technology

China is large agricultural country, and the potash fertilizer demand is huge, but potassium resource extremely lacks, and domestic reserves can't satisfy China's demand growing to potash fertilizer, have seriously restricted the development of potash fertilizer production and have threatened national agriculture safety.China's potash fertilizer demand grows with each passing day in recent years, but domestic YO is merely ten thousand tons of about 300-400, and agriculture required potash fertilizer still mainly leans on import to solve, and the external interdependency of potash fertilizer is up to more than 75%.The passive situation of this long-term dependence on import is unfavorable for guaranteeing the long-term heavy demand of China to the potash fertilizer resource, has a strong impact on the fast development of Chinese national economy and the safety of national long-range strategic resource.Laos and China's narrow strip of water are the friendly neighbouring countries of China, are distributed with abundant solid potassium resource; In Laos everything Plain, 2.92 hundred million tons of Repone K reserves have been verified, 133.6 hundred million tons of prediction Repone K prospective reservess.At present, the how tame large-lot producer of China has taken the exploration right or the mineral right of Laos's sylvite, and the exploitation of Laos's sylvite raises the curtain, and this has active effect to the short supply state of alleviating China's potash fertilizer.But Laos's sylvite deposit is main with carnallitite, companion's symbiosis sylvite.Not only produce a large amount of magnesium chlorides in the production process of potassium ore deposit; And can produce a large amount of industrial waste salts; Because special amblent air temperature has determined the requirement that Laos government preserves the ecological environment to the high standard of exploitation of mineral resources, Laos's sylvite deposit exploitation can not be adopted domestic existing traditional method fully.So the comprehensive utilization of magnesium chloride and a large amount of abraum salts and processing seem even more important.

Summary of the invention

Characteristics such as the present invention utilizes magnesia cement to have high-strengthly, fast to coagulate, cohesive force is strong; To the actual state of a large amount of magnesium chlorides that produce in the solid sylvite performance history, the invention provides a kind of magnesium chloride and halite, tail salt, saliferous slag of producing in the sylvite production process of utilizing and make the concrete new technology of magnesite rock salt with a large amount of halites, mine tailing, tailings.This concrete production is easy, cost is low, energy-conserving and environment-protective; Can process rock salt concrete or rock salt foamed concrete; Backfill is carried out in mine goaf, pit or tunnel; So not only can solve the influence of mine tailing, tail salt discharging, and can improve mining recovery, reduce mining cost environment; Area rock salt concrete capable of using or rock salt foamed concrete are poured into a mould various building foundations, pond, salt pan plate and dykes and dams in the salt lake, can effectively improve the efficient and raising dykes and dams intensity of salt pan Exposure to Sunlight carnallitite.It is characterized in that its production technology method:

1, raw material is formed (weight %):

1. Natural manganese dioxide is 2.5-15%, the active oxidation magnesium dust of being processed through pyrolysis etc. through calcining or magnesium chloride by magnesite, rhombspar;

2. magnesium chloride is 2.0-15%, is the various magnesium chloride brines that produce in bischofite, halogen sheet, Magnesium Chloride Anhydrous or the potassium fertilizer production process;

3. filler accounts for the 5-25% that raw material is formed, and is drift, dust storm stores or various types of clay deposition thing in river and pond and lake;

4. rock salt consists of 30-85%, is various halites, tail salt, abraum salt or the saliferous slag that produces in the production process;

5. water is the 5.5-15% that raw material is formed.

 

2, production technique:

1. the outfit of magnesium chloride brine: prepare the above magnesium chloride brine of 20Be ' or utilize the above various magnesium chloride brines of 20Be ' that produce in the potassium fertilizer production process with magnesium chloride;

2. Natural manganese dioxide, filler are formed in the magnesium chloride brine that adds 1. by above-mentioned raw materials and processed the magnesia cement slip;

3. form by above-mentioned raw materials rock salt is mixed with the magnesia cement slip that 2. makes, stirs and process magnesite rock salt concrete slurry;

The magnesite rock salt concrete slurry that 4. will 3. make injects mould can make magnesite rock salt concrete brick, rock salt concrete slab or building block;

The rock salt concrete slurry that 5. will 3. make is delivered to the mining well, but backfill salt ore goaf, pit or tunnel;

The magnesite rock salt concrete slurry that 6. will 3. make is poured on the various building foundations, corrodes geographic building foundation as rock salt;

The magnesite rock salt concrete slurry that 7. will 3. make is poured at the bottom of the pond, salt pan or on the dykes and dams, can be used as the pond plate or the salt pan protecting slope of dam in salt pan.

3, product advantage

1. various halites, tail salt, abraum salt or the saliferous slag that produces in mining and the process of manufacture can utilized and handle to this concrete production;

2. be extremely important for multipurpose use of three types of wastes, environment protection and raising mining recovery;

3. the rock salt concrete strength is high, has the characteristics of the anti-water of anti-bittern burn into, anti-leakage, in the middle of backfill, support and the mine of pond plate, dykes and dams or salt mine that can be widely used in building foundation, the salt pan in salt mining area safeguarded;

4. main raw material(s) can solve on the spot, produce easy, cost is low, pollution-free, energy-conserving and environment-protective.

Embodiment

Case study on implementation one:

1. in 7.4% bischofite, behind the water of adding 11.1%, stirring lets magnesium chloride fully dissolve, and processes magnesium chloride brine;

2. 2.6% light burnt powder (content of magnesia is 88.0%) is mixed with 5.2% filler, process the magnesite batch mixing;

3. magnesite batch mixing adding magnesium chloride brine is 1. 2. fully stirred, make the magnesia cement slip;

4. (3. φ＜2cm ﹚ joins and makes magnesite rock salt concrete slurry in the magnesia cement slip with 73.8% broken salt;

5. magnesite rock salt concrete slurry injection mould is 4. made magnesite rock salt concrete brick, rock salt concrete slab or building block;

6. recording magnesite rock salt concrete crushing strength after one month is 4.0MPa.

Case study on implementation two:

1. in 5.0% bischofite, behind the water of adding 8.0%, stirring lets magnesium chloride fully dissolve, and processes magnesium chloride brine;

2. 11.0% Natural manganese dioxide (dolomite calcination makes, content of magnesia 23.0%) is mixed with 11.0% filler, process the magnesite batch mixing;

3. the magnesium chloride brine that 1. above-mentioned 2. magnesite batch mixing is added fully stirs, and makes the magnesia cement slip;

4. (the magnesite mud that 3. φ＜2mm ﹚ joins makes magnesite rock salt concrete slurry with broken salt 65.0%;

5. above-mentioned 4. magnesite rock salt mud is injected mould and make magnesite rock salt concrete brick or building block;

Case study on implementation three:

1. in the old halogen of 34Be ' of salt pan discharging, thin up is got the magnesium chloride brine 30kg of this 28Be ' to 28Be ';

2. the active oxidation magnesium dust with 15kg mixes with the 45kg filler, processes the magnesite batch mixing;

3. 2. magnesite batch mixing adding magnesium chloride brine 1. fully stirs, and makes the magnesia cement slip;

4. (φ＜2mm ﹚ joins in the magnesite rock salt mud 3. and makes magnesite rock salt concrete slurry with broken salt 80kg;

5. 4. magnesite rock salt concrete slurry is built 10cm thickness on salt pan dykes and dams and pond plate;

6. after 2-3 hour 5. the rock salt concrete slurry solidify, formed firm salt pan protecting slope of dam and pond, salt pan plate after the about week.

Claims (3)

1. rock salt concrete is characterized in that being made up of the raw material of following weight ratio:

Rock salt 30-85%, Natural manganese dioxide 2.5-15%, magnesium chloride 2.0-15%, water 5.5-15%, filler 5-25%.

2. rock salt concrete according to claim 1 is characterized in that:

1. rock salt consists of 30-85%, is various halites, tail salt, abraum salt or the saliferous slag that produces in the production process;

2. Natural manganese dioxide is 2.5-15%, the active oxidation magnesium dust of being processed through pyrolysis etc. through calcining or magnesium chloride by magnesite, rhombspar;

3. magnesium chloride is 2.0-15%, is the various magnesium chloride brines that produce in bischofite, halogen sheet, Magnesium Chloride Anhydrous or the potassium fertilizer production process;

4. filler accounts for the 5-25% that raw material is formed, and is drift, dust storm stores or various types of clay deposition thing in river and pond and lake;

5. water is the 5.5-15% that raw material is formed.

3. concrete making of rock salt according to claim 1 and application is characterized in that making method is following:

1. the outfit of magnesium chloride brine: prepare the above magnesium chloride brine of 20Be ' or utilize the above various magnesium chloride brines of 20Be ' that produce in the potassium fertilizer production process with magnesium chloride;

2. Natural manganese dioxide, filler are formed in the magnesium chloride brine that adds 1. by above-mentioned raw materials and processed the magnesia cement slip;

3. form by above-mentioned raw materials rock salt is mixed with the magnesia cement slip that 2. makes, stirs and process magnesite rock salt concrete slurry;

Described being applied as:

The magnesite rock salt concrete slurry that 4. will 3. make injects mould can make magnesite rock salt concrete brick, rock salt concrete slab or building block;

The rock salt concrete slurry that 5. will 3. make is delivered to the mining well, but backfill salt ore goaf, pit or tunnel;

The magnesite rock salt concrete slurry that 6. will 3. make is poured on the various building foundations, corrodes geographic building foundation as rock salt;

The magnesite rock salt concrete slurry that 7. will 3. make is poured at the bottom of the pond, salt pan or on the dykes and dams, can be used as the pond plate or the salt pan protecting slope of dam in salt pan.