34 results about "Salt calcium" patented technology

The invention relates to a low-sulfur large-grained salt produced from sodium sulfate type salt mine and a preparation method thereof. Liquid calcium from ammonia alkali factory is blended with water and injected into sodium sulfate type salt mine for underground desulfurization to form high calcium brine, and the high calcium brine as a raw material is subjected to salt calcium coproduction to produce low-sulfur large-grained salt by using an MVR (mechanical vapor recompression) evaporator with a crystal cultivation baffling cylinder and a unique production process. The product comprises not less than 99.50% of sodium chloride (dry basis), no more than 0.2% of sulfate radical, more than 70% of granularity greater than 0.4 mm, and no more than 1% of granularity less than 0.15 mm; the product does not contain any anti-caking agent, and has anti-caking period more than 4 months, so as to meet the needs of industrial production turnover.

The invention relates to a process of ammonia-soda-combined-soda cyclic production for sodium chloride, sodium carbonate, liquid ammonia, ammonium chloride, calcium chloride and calcium carbonate. The process comprises the following steps: using brine, carbon dioxide and acetylene sludge as raw materials for producing sodium carbonate by an ammonia-soda method, injecting the generated waste liquid in a salt well and extracting brine, leaving and storing the calcium sulphate generated after nitrate removal and the injected soda sludge in the salt well, conveying the extracted brine into a salt calcium co-production device, producing a solid salt, reacting a part of the remainder solution with sodium carbonate to produce calcium carbonate, using a part as liquid calcium chloride, and evaporating the other part to produce calcium chloride dehydrate; using the obtained solid salt, ammonia and carbon dioxide as raw materials for producing sodium carbonate and ammonium chloride by a combined-soda method; adding wet ammonium chloride in the ammonia-soda waste liquid and decomposing. According to the process, the efficiency and yield of cyclic production are increased, and environmental pollution is reduced; the purities of sodium carbonate, calcium carbonate, ammonium chloride and solid salt are up to 99.0%, 99.9%, 99.5% and 95% respectively, the content of solid calcium is 74%, liquid calcium can be optimally configured, and the particle size of calcium carbonate is nanometre-submicron order.

The invention discloses a method for burning chromium salt calcium-free roasting coal powder. The invention adopts low sulfur coal as fuel and provides heat source to a rotary kiln through jet fire of a burner. The farthest point of the high temperature reaction zone of the rotary kiln has a distance of 11 to 19 m to the kiln port; and the burning temperature is 1,000 to 1,150 DEG C, which belongs to a strong oxidation atmosphere. The invention provides heat source to the chromium salt rotary kiln through the burning of the multi air ducts, which substitutes for light fuels such as heavy oil,liquefied gas, natural gas, etc. required to be adopted in chromium salt calcium-free roasting technology, so that the roasting cost reduced by 60% and the raw coal storage is safe, thereby speciallysuiting the use on any occasions. The technology is easy to improve and has remarkable effect, and can be widely applied to chromium salt production.