Hydrochloric acid method of beneficiating magnesite using a pilot plant

Refractories ◽  
1984 ◽  
Vol 25 (11-12) ◽  
pp. 633-638
Author(s):  
V. A. Smertin ◽  
E. B. Glezer ◽  
K. V. Simonov ◽  
V. L. Zakutinskii ◽  
V. A. Khaltyurin ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Pilot Plant ◽  
Acid Method

The corrosion resistance of structural materials in media formed in the production of strontium carbonate by the hydrochloric acid method

1978 ◽  
Vol 14 (4) ◽  
pp. 336-338
Author(s):  
Ts. L. Drukh ◽  
N. M. Davydenko ◽  
�. B. Gitis ◽  
F. I. Strigunov ◽  
I. A. Lagno ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Hydrochloric Acid ◽  
Structural Materials ◽  
Strontium Carbonate ◽  
Acid Method

The Discussion on Synthesis Process of Biurea by Hydrochloric Acid

2013 ◽  
Vol 448-453 ◽  
pp. 464-467 ◽  
Author(s):  
Meng Meng Qi ◽  
Ran Guo ◽  
Meng Su ◽  
Xiao Xue Cheng ◽  
Ling Zhang
Keyword(s):  
Hydrochloric Acid ◽  
Hydrazine Hydrate ◽  
Ph Value ◽  
Condensation Reaction ◽  
Complex Salt ◽  
Synthesis Process ◽  
Optimum Process ◽  
Process Conditions ◽  
Acid Method ◽  
Reaction Solution

By Series of comparative experiments, Factors of influencing the yield of biurea which is prepared from the condensation reaction between hydrazine hydrate and urea are studied, such as pH value, ratio of urea to hydrazine hydrate, temperature of reaction solution, reaction time and acid addition order. Under the optimum process conditions, the yield of biurea can reach over 97%, the biurea produced by hydrochloric acid method avoids large amounts of complex salt wastewater in condensation reaction of sulfuric acid method, and make the production process of biurea tends to be more environmentally friendly.

THERMAL DECARBOXYLATION OF URONIC ACIDS

1952 ◽  
Vol 30 (4) ◽  
pp. 278-290 ◽  
Author(s):  
A. S. Perlin
Keyword(s):  
Carbon Monoxide ◽  
Reaction Time ◽  
Hydrochloric Acid ◽  
Nitrogen Dioxide ◽  
Carbon Skeleton ◽  
Uronic Acids ◽  
Acid Method ◽  
Thermal Decarboxylation ◽  
Good Agreement

A novel decarboxylation of uronic acids by merely heating the material without the use of a solvent or added catalyst is described. At approximately 255 °C. decarboxylation for uronic and polyuronic acids and salts within 15 min. reaction time is nearly quantitative. Vigorous dehydration occurs simultaneously, the residue corresponding basically to a 5-carbon skeleton that contains 1.5 atoms of oxygen. Other products of the reaction are minor and include carbon monoxide, and traces of acid and oils. Sugar acids, such as gluconic and ascorbic, are not as extensively decarboxylated. The reaction is employed for analysis of several nitrogen dioxide oxidized celluloses and starches and the results are in good agreement with those given by titration and the 12% hydrochloric acid method.

Beneficiation technology for natural and caustic magnesite using the hydrochloric acid method

Refractories ◽  
1980 ◽  
Vol 21 (7-8) ◽  
pp. 343-347
Author(s):  
K. V. Simonov ◽  
V. N. Koptelov ◽  
E. B. Glezer ◽  
R. S. Polovinkina ◽  
N. S. Afinogenova ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Caustic Magnesite ◽  
Acid Method

scholarly journals Comparisons between methods of measuring soluble phosphorus and potassium in soils used for fertilizer experiments on sugar beet

1962 ◽  
Vol 59 (2) ◽  
pp. 269-274 ◽  
Author(s):  
R. G. Warren ◽  
G. W. Cooke
Keyword(s):  
Acetic Acid ◽  
Citric Acid ◽  
Hydrochloric Acid ◽  
Sugar Beet ◽  
Analytical Methods ◽  
Field Experiments ◽  
Soil Analysis ◽  
Water Soluble ◽  
Acid Method ◽  
Soluble P

Eleven years of field experiments on manuring sugar beet were used by the late E. M. Crowther to compare methods of analysing soils for soluble P and K; this paper reports his work.The experiments were divided by soil analyses into groups of equal numbers of sites; average crop responses were used to value the analytical methods. Such tables of average data overvalue soil analyses because each method was misleading in a small proportion of the fields used. A quantitative way was developed of assessing the gains from using soil analysis in planning fertilizing and of comparing analytical methods. The total profit from uniformly manuring all the soils examined was compared with the profit made by using analyses to select a proportion only of the soils to be manured; the total amount of fertilizer used was the same with each way of planning manuring. The most efficient analytical method gave the most profit.For phosphate, differential manuring of sites selected by soil analysis was more profitable than uniform manuring, with all the methods of measuring soluble P that were tested. The best method used a rapid extraction with dilute hydrochloric acid, but extracting with water (calcium bicarbonate solution was used for calcareous soils), or with citric acid solution, was nearly as effective. These three methods, using little solvent relative to soil, were more useful than methods using larger volumes of dilute sulphuric acid, dilute acetic acid, and a lactate solution.The sugar beet responded more often to K than to P manuring, so there was less chance of making extra profit by using analyses to detect the richer soils where either no K fertilizer, or small dressings only, should have been given. Using the citric acid method of measuring soluble-K to separate the soils into groups for differental manuring was more profitable than giving uniform dessings to all fields; acetic acid was less effective than citric acid, and the hydrochloric acid method gave no advantage over uniform manuring with the heavier rate of potassium. Water-soluble K measurements were worse than acid-soluble values; using them to predict responses and manuring would have given less profit than uniform manuring at the heavier rate used.

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